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Zou W, Yu Q, Liu Y, Li Q, Chen H, Gao J, Shi C, Wang Y, Chen W, Bai X, Yang B, Zhang J, Dong B, Ruan B, Zhou L, Xu G, Hu Z, Yang X. Genotype analysis of rotaviruses isolated from children during a phase III clinical trial with the hexavalent rotavirus vaccine in China. Virol Sin 2023; 38:889-899. [PMID: 37972894 PMCID: PMC10786658 DOI: 10.1016/j.virs.2023.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 11/09/2023] [Indexed: 11/19/2023] Open
Abstract
The oral hexavalent live human-bovine reassortant rotavirus vaccine (RV6) developed by Wuhan Institute of Biological Products Co., Ltd (WIBP) has finished a randomized, placebo-controlled phase III clinical trial in four provinces of China in 2021. The trail demonstrated that RV6 has a high vaccine efficacy against the prevalent strains and is safe for use in infants. During the phase III clinical trial (2019-2021), 200 rotavirus-positive fecal samples from children with RV gastroenteritis (RVGE) were further studied. Using reverse transcription-polymerase chain reaction and high-throughput sequencing, VP7 and VP4 sequences were obtained and their genetic characteristics, as well as the differences in antigenic epitopes of VP7, were analyzed in detail. Seven rotavirus genotypes were identified. The predominant rotavirus genotype was G9P [8] (77.0%), followed by prevalent strains G8P [8] (8.0%), G3P [8] (3.5%), G3P [9] (1.5%), G1P [8] (1.0%), G2P [4] (1.0%), and G4P [6] (1.0%). The amino acid sequence identities of G1, G2, G3, G4, G8, and G9 genotypes of isolates compared to the vaccine strains were 98.8%, 98.2%-99.7%, 88.4%-99.4%, 98.2%, 94.2%-100%, and 93.9%-100%, respectively. Notably, the vaccine strains exhibited high similarity in amino acid sequence, with only minor differences in antigenic epitopes compared to the Chinese endemic strains. This supports the potential application of the vaccine in preventing diseases caused by rotaviruses.
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Affiliation(s)
- Wenqi Zou
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Qingchuan Yu
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Yan Liu
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Qingliang Li
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Hong Chen
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Jiamei Gao
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Chen Shi
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Ying Wang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Wei Chen
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Xuan Bai
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Biao Yang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Jiuwei Zhang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Ben Dong
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Bo Ruan
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Liuyifan Zhou
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Gelin Xu
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China
| | - Zhongyu Hu
- National Institutes for Food and Drug Control, Beijing, 100050, China.
| | - Xiaoming Yang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Products Co., Ltd, Wuhan, 430207, China; China National Biotec Group, Beijing, 100024, China.
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Ruan B, Zhou T, Yuan Z, Singh J, Teng J, Zheng S, Zhang J. Effects of Curing Conditions on Splitting Tensile Behavior and Microstructure of Cemented Aeolian Sand Reinforced with Polypropylene Fiber. Materials (Basel) 2023; 16:6347. [PMID: 37834484 PMCID: PMC10573345 DOI: 10.3390/ma16196347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/14/2023] [Accepted: 09/20/2023] [Indexed: 10/15/2023]
Abstract
Aeolian sand is widely distributed in the Takramagan Desert, Xinjiang, China, which cannot be directly used as railway subgrade filling. It is beneficial for environmental protection to use fiber and cement-reinforced aeolian sand as railway subgrade filling. The present work is to explore the enhancement of tensile strength in cemented aeolian sand via the incorporation of polypropylene fibers under conditions of elevated temperature and drying curing. The purpose Is to delve into the examination of the temperature's impact on not only the mechanical attributes but also the microstructure of cemented aeolian sand reinforced with polypropylene fiber (CSRPF). For this, a comprehensive set of tests encompassing splitting tensile strength (STS) assessments and nuclear magnetic resonance (NMR) examinations is conducted. A total of 252 CSRPF specimens with varying fiber content (0, 6‱, 8‱, and 10‱) are tested at different curing temperatures (30 °C, 40 °C, 50 °C, 60 °C, 70 °C, and 80 °C). The outcomes of the NMR examinations indicate that elevating the curing temperature induces the expansion of pores within CSRPF, both in size and volume, consequently contributing to heightened internal structural deterioration. STS tests demonstrate that the STS of CSRPF decreases as the curing temperature increases. Meanwhile, the STS of CSRPF increases with fiber content, with optimal fiber content being 8‱. Regression models accurately predict the STS, with the curing temperature exhibiting the greatest influence, followed by the fiber content according to sensitivity analysis. The research results provide a valuable reference for the use of CSRPF as railway subgrade filling under high temperature and drying conditions.
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Affiliation(s)
- Bo Ruan
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
| | - Tianyao Zhou
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
| | - Zhongzheng Yuan
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
| | - Jenisha Singh
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
| | - Jidong Teng
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
- National Engineering Research Centre for High-Speed-Railway Construction, Central South University, Changsha 410075, China
| | - Shilong Zheng
- China Railway SiYuan Survey and Design Group Co., Ltd., Wuhan 430063, China;
| | - Jiasen Zhang
- School of Civil Engineering, Central South University, Changsha 410075, China; (B.R.); (T.Z.); (Z.Y.); (J.S.); (J.Z.)
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Li J, Li H, Zhou Y, Xiang H, Lv M, Ruan B, Bo Z, Shen H, Xu F, Huang Y, Li L, Sun P. Effects of Compound Probiotics on Cecal Microbiota and Metabolome of Swine. Animals (Basel) 2023; 13:ani13061006. [PMID: 36978547 PMCID: PMC10044668 DOI: 10.3390/ani13061006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/05/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
Complex probiotics are made from various single probiotics mixed in scientific formula. The long-term intake of different probiotics is beneficial to maintain the intestinal microecological balance, inhibiting harmful pathogenic flora and facilitating organism health. Based on the limited research on intestinal flora and related metabolites after the long-term intake of the probiotic complex, in this study, 16S rRNA gene sequencing and untargeted metabolomics were used to further investigate the effects of the probiotic complex on the intestinal flora and metabolome of pigs. The results demonstrated that the content of flora in the intestinal tract or metabolites of pigs varied greatly and was related to cellular metabolic pathways after the long-term feeding of complex probiotics. This study provides a valuable theoretical basis for farmers to raise pigs scientifically and healthily.
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Affiliation(s)
- Jie Li
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Hongyue Li
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Yi Zhou
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Hongwei Xiang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Muze Lv
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Bo Ruan
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Zongyi Bo
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
| | - Haixiao Shen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Fazhi Xu
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Yafeng Huang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Liang Li
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
- Correspondence: (L.L.); (P.S.)
| | - Pei Sun
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
- Correspondence: (L.L.); (P.S.)
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Wu Z, Li Q, Liu Y, Lv H, Mo Z, Li F, Yu Q, Jin F, Chen W, Zhang Y, Huang T, Hu X, Xia W, Gao J, Zhou H, Bai X, Liu Y, Liang Z, Jiang Z, Chen Y, Zhang J, Du J, Yang B, Xing B, Xing Y, Dong B, Yang Q, Shi C, Yan T, Ruan B, Shi H, Fan X, Feng D, Lv W, Zhang D, Kong X, Zhou L, Que D, Chen H, Chen Z, Guo X, Zhou W, Wu C, Zhou Q, Liu Y, Qiao J, Wang Y, Li X, Duan K, Zhao Y, Yang X, Xu G. Efficacy, safety and immunogenicity of hexavalent rotavirus vaccine in Chinese infants. Virol Sin 2022; 37:724-730. [PMID: 35926726 PMCID: PMC9583109 DOI: 10.1016/j.virs.2022.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/19/2022] [Indexed: 11/26/2022] Open
Abstract
A randomized, double-blind, placebo-controlled multicenter trial was conducted in healthy Chinese infants to assess the efficacy and safety of a hexavalent live human-bovine reassortant rotavirus vaccine (HRV) against rotavirus gastroenteritis (RVGE). A total of 6400 participants aged 6–12 weeks were enrolled and randomly assigned to either HRV (n = 3200) or placebo (n = 3200) group. All the subjects received three oral doses of vaccine four weeks apart. The vaccine efficacy (VE) against RVGE caused by rotavirus serotypes contained in HRV was evaluated from 14 days after three doses of administration up until the end of the second rotavirus season. VE against severe RVGE, VE against RVGE hospitalization caused by serotypes contained in HRV, and VE against RVGE, severe RVGE, and RVGE hospitalization caused by natural infection of any serotype of rotavirus were also investigated. All adverse events (AEs) were collected for 30 days after each dose. Serious AEs (SAEs) and intussusception cases were collected during the entire study. Our data showed that VE against RVGE caused by serotypes contained in HRV was 69.21% (95%CI: 53.31–79.69). VE against severe RVGE and RVGE hospitalization caused by serotypes contained in HRV were 91.36% (95%CI: 78.45–96.53) and 89.21% (95%CI: 64.51–96.72) respectively. VE against RVGE, severe RVGE, and RVGE hospitalization caused by natural infection of any serotype of rotavirus were 62.88% (95%CI: 49.11–72.92), 85.51% (95%CI: 72.74–92.30) and 83.68% (95%CI: 61.34–93.11). Incidences of AEs from the first dose to one month post the third dose in HRV and placebo groups were comparable. There was no significant difference in incidences of SAEs in HRV and placebo groups. This study shows that this hexavalent reassortant rotavirus vaccine is an effective, well-tolerated, and safe vaccine for Chinese infants. A multicenter, double-blind, phase III clinical trial for the efficacy and safety of hexavalent rotavirus vaccine (HRV). The vaccine efficacy against rotavirus gastroenteritis caused by serotypes contained in HRV was 69.21%. The efficacy against severe rotavirus gastroenteritis and hospitalization caused by serotypesin HRV were 91.36% and 89.21%. No significant difference between the incidences of adverse events and severe adverse events in HRV and placebo group. This hexavalent live human-bovine reassortant rotavirus vaccine iseffective, well tolerated and safe in Chinese infants.
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Affiliation(s)
- Zhiwei Wu
- Hebei Center for Disease Control and Prevention, Shijiazhuang, 050021, China
| | - Qingliang Li
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Yan Liu
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Huakun Lv
- Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Zhaojun Mo
- Guangxi Zhuang Autonomous Region Center for Disease Control and Prevention, Nanning, 530028, China
| | - Fangjun Li
- Hunan Center for Disease Control and Prevention, Changsha, 410005, China
| | - Qingchuan Yu
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Fei Jin
- Hebei Center for Disease Control and Prevention, Shijiazhuang, 050021, China
| | - Wei Chen
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Yong Zhang
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Teng Huang
- Guangxi Zhuang Autonomous Region Center for Disease Control and Prevention, Nanning, 530028, China
| | - Xiaosong Hu
- Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Wei Xia
- Hunan Center for Disease Control and Prevention, Changsha, 410005, China
| | - Jiamei Gao
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Haisong Zhou
- Zhengding County Center for Disease Control and Prevention, Shijiazhuang, 050800, China
| | - Xuan Bai
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Yueyue Liu
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Zhenzhen Liang
- Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Zhijun Jiang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Yingping Chen
- Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Jiuwei Zhang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Jialiang Du
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Biao Yang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Bo Xing
- Zhejiang Center for Disease Control and Prevention, Hangzhou, 310051, China
| | - Yantao Xing
- Daming County Center for Disease Control and Prevention, Handan, 056900, China
| | - Ben Dong
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Qinghai Yang
- Liucheng County Center for Disease Control and Prevention, Liuzhou, 545200, China
| | - Chen Shi
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Tingdong Yan
- Xiangtan County Center for Disease Control and Prevention, Xiangtan, 411228, China
| | - Bo Ruan
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Haiyun Shi
- Yuhuan County Center for Disease Control and Prevention, Taizhou, 317600, China
| | - Xingliang Fan
- National Institutes for Food and Drug Control, Beijing, 100050, China
| | - Dongyang Feng
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Weigang Lv
- Yongnian County Center for Disease Control and Prevention, Handan, 056000, China
| | - Dong Zhang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Xiangchu Kong
- Rongshui Miao Autonomous County Center for Disease Control and Prevention, Liuzhou, 545300, China
| | - Liuyifan Zhou
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Dinghong Que
- You County Center for Disease Control and Prevention, Zhuzhou, 412315, China
| | - Hong Chen
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Zhongbing Chen
- Longyou County Center for Disease Control and Prevention, Quzhou, 324400, China
| | - Xiang Guo
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Weiwei Zhou
- Laishui County Center for Disease Control and Prevention, Baoding 074100, China
| | - Cong Wu
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Qingrong Zhou
- Jiangshan County Center for Disease Control and Prevention, Quzhou, 324100, China
| | - Yuqing Liu
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Jian Qiao
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Ying Wang
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Xinguo Li
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Kai Duan
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China
| | - Yuliang Zhao
- Hebei Center for Disease Control and Prevention, Shijiazhuang, 050021, China.
| | - Xiaoming Yang
- China National Biotec Group Company Limited, National Engineering Technology Research Center for Combined Vaccines, Wuhan, 430207, China.
| | - Gelin Xu
- National Engineering Technology Research Center for Combined Vaccines, Wuhan Institute of Biological Product Co., Ltd., Wuhan, 430207, China.
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Chen C, Yang Q, Leng W, Dong J, Xu F, Wei L, Ruan B. Experimental Investigation of the Mechanical Properties of the Sand–Concrete Pile Interface Considering Roughness and Relative Density. Materials 2022; 15:ma15134480. [PMID: 35806605 PMCID: PMC9267591 DOI: 10.3390/ma15134480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 11/16/2022]
Abstract
The aim of this study was to investigate the effect of roughness and relative density on the mechanical properties of sand–concrete pile interface. A series of direct shear tests were carried out on the interface using a large-scale direct shear apparatus with various relative densities of sand (73%, 47%, and 23%) and concrete blocks with four roughness values (I = 0, 10, 20, and 30 mm). Various mechanical properties (such as shear stress, volume change, peak shear strength, secant friction angle, and normalized friction coefficient) from the interface tests were compared with trends obtained from the pure sand direct shear test. For the smooth interface, the shear stress–horizontal displacement curves of the dense sand specimen exhibited a slight softening response, which became more apparent as the roughness increased. The curves of the loose sand specimen demonstrated a hardening response. The volumetric response was influenced by the combination of normal stress, relative density, and roughness. The peak shear strength demonstrated a nonlinear increasing trend as the normal stress increased. With an increase in the normal stress, the secant friction angle and peak friction coefficient decreased as exponential and power functions, respectively. Additionally, a critical roughness value Icr resulted from the tests, which halted the upward trend of the peak friction coefficient and normalized the secant friction angle when I exceeded Icr.
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Affiliation(s)
- Chen Chen
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
| | - Qi Yang
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- MOE Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha 410075, China
- Correspondence:
| | - Wuming Leng
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- MOE Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha 410075, China
| | - Junli Dong
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- MOE Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha 410075, China
| | - Fang Xu
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- Huan Tieyuan Civil Engineering Testing Co., Ltd., Changsha 410075, China
| | - Limin Wei
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- MOE Key Laboratory of Engineering Structure of Heavy Haul Railway, Central South University, Changsha 410075, China
| | - Bo Ruan
- School of Civil Engineering, Central South University, Changsha 410075, China; (C.C.); (W.L.); (J.D.); (F.X.); (L.W.); (B.R.)
- Huan Tieyuan Civil Engineering Testing Co., Ltd., Changsha 410075, China
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Wang T, Ruan B, Wang J, Zhou Z, Zhang X, Zhang C, Zhao H, Yang Y, Yuan D. Activation of NLRP3-Caspase-1 pathway contributes to age-related impairments in cognitive function and synaptic plasticity. Neurochem Int 2021; 152:105220. [PMID: 34743016 DOI: 10.1016/j.neuint.2021.105220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 10/12/2021] [Accepted: 11/02/2021] [Indexed: 11/29/2022]
Abstract
Aging is characterized by a progressive deterioration in physiological functions that is associated with cognitive decline as well as other physical functional impairments. Microglia activation leading to neuroinflammation has been generally recognized as playing a critical role in the development of age-related cognitive decline. NLRP3 inflammasome in microglia is fundamental for IL-1β maturation and subsequent inflammatory events. However, it remains unknown whether NLRP3 activation contributes to aging-induced cognitive decline in vivo. Here, our study demonstrated that aging rats showed declined cognitive function and impaired synaptic plasticity as well as decreased density of dendritic spines. Importantly, our data demonstrated strongly enhanced expression of NLRP3, ASC and Caspase-1 in the hippocampus of aged rats as well as decreased AMPA receptor and phosphorylated levels of CaMKII and CREB in the hippocampus of natural aging rats. Furthermore, NLRP3 inflammasome inhibitor elevated the surface expression of AMPA receptor and the phosphorylated levels of CaMKII, CREB in hippocampus, and finally contributed to the attenuation of hippocampal long-term potentiation (LTP) deficits and the improvement of cognitive decline of natural aging rats. These results revealed an important role for the NLRP3-Caspase-1 pathway in aging-induced cognitive decline and suggested that inhibition of NLRP3 inflammasome represented a novel therapeutic intervention for aging-related cognitive impairment.
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Affiliation(s)
- Ting Wang
- Academy of Nutrition and Health,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China; Department of Pharmacy, College of Medicine, Wuhan University of Science and Technology, Wuhan, China
| | - Bo Ruan
- College of Medical Science, Three Gorges University, Yichang, Hubei, China
| | - Jinxin Wang
- College of Traditional Chinese Medicine, Three Gorges University & Yichang Hospital of Traditional Chinese Medicine, Yichang, Hubei, China
| | - Zhiyong Zhou
- College of Medical Science, Three Gorges University, Yichang, Hubei, China
| | - Xulan Zhang
- College of Medical Science, Three Gorges University, Yichang, Hubei, China
| | - Changcheng Zhang
- College of Medical Science, Three Gorges University, Yichang, Hubei, China
| | - Haixia Zhao
- College of Medical Science, Three Gorges University, Yichang, Hubei, China
| | - Yuanjian Yang
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China.
| | - Ding Yuan
- College of Medical Science, Three Gorges University, Yichang, Hubei, China.
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Ye Q, Chen SH, Zhang Y, Ruan B, Zhang YJ, Zhang XK, Jiang T, Wang X, Ma N, Tsai FC. Chitosan/Polyvinyl Alcohol/ Lauramidopropyl Betaine/2D-HOF Mixed Film with Abundant Hydrogen Bonds Acts as High Mechanical Strength Artificial Skin. Macromol Biosci 2021; 21:e2100317. [PMID: 34626523 DOI: 10.1002/mabi.202100317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/30/2021] [Indexed: 12/17/2022]
Abstract
The mechanical properties of artificial skins are complicated to maintain under ensuring air permeability and antimicrobial. Thus, a series of hydrophilic antimicrobial polymer networks are prepared by crosslinking chitosan and polyvinyl alcohol with the lauramidopropyl betaine and hydrogen bond organic framework (CS/PVA/LPB/2D-HOF). The mechanical performance of the control groups and the complex are systematically evaluated to attain an artificial strength skin. The CS/PVA/LPB/2D-HOF complex exhibits strong mechanical abilities than other control groups. By analyzing the IR spectra and the morphology, the synergistic effect of hydrogen bonds between molecules and cracks significantly improves the mechanical properties of the complex. Its maximum tensile strength can reach 29 MPa, and its maximum load capacity can reach 3700 g. Notably, the composite membrane also performs an excellent antimicrobial activity. In vivo and in vitro experiments show that the hybrid membrane can promote tissue regeneration and wound healing (95%). These results may open up the opportunity for future composite material investigations in the artificial skin and tissue engineering field.
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Affiliation(s)
- Qin Ye
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Shu-Han Chen
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Ya Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Bo Ruan
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Yi-Jie Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Xin-Ke Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Tao Jiang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Xiaoge Wang
- Department Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Ning Ma
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Fang-Chang Tsai
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China.,Hubei Provincial Key Laboratory of Economic Forest Germplasm Improvement and Comprehensive Utilization of Resources, Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Huanggang Normal University, Huanggang, 438000, China
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Ma J, Huang R, Ma XL, Li X, Zhang TS, Ruan B. [Identification and genetic analysis of new mutations in EYA1 gene of BOS syndrome]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 56:966-971. [PMID: 34666446 DOI: 10.3760/cma.j.cn115330-20210126-00040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the clinical manifestations of a patient with branchiootic syndrome(BOS) and her families and to carry out genetic testing in order to specify the biological pathogenesis. Methods: Clinical data of the patient and her families were collected. Genomic DNA in the peripheral blood of the proband and her family members was extracted. All exons of 406 deafness-related susceptible genes as well as their flanking regions were sequenced by high-throughput sequencing, and the mutation sites of the proband and her parents were validated by Sanger sequencing. Results: There were nine members in three generations, of whom four presented with hearing loss, preauricular fistula and branchial fistula which met the diagnostic criteria of BOS. Proband and her mother presented with auricle malformation and inner ear malformation. And no one had abnormalities in the kidneys of all the patients. Pedigree analysis revealed that the mode of inheritance in the family was consistent with the autosomal dominant pattern. Mutational analysis showed that all the affected patients detected a heterozygous frameshift variation c.1255delT in the EYA1 gene, which had not been reported. Genotype and phenotype were co-isolated in this family. Such a frameshift variation produced a premature termination codon, thereby causing premature termination of translation (p.C419VFS*12). ACMG identified that the mutation was pathogenic. This mutation was novel and not detected in controls. A heterozygous missense variation mutation c.403G>A(p.G135S) in EYA1 gene was also detected in three members of this family. ACMG identified that the mutation clinical significance was uncertain. However, two of whom were normal, which seemed the disease was not caused by this mutation in this family. Conclusions: A novel frameshift mutation in EYA1(c.1255delT) is the main molecular etiology of BOS in the Chinese family. This study expands the mutational spectrum of EYA1 gene. The clinical manifestations are heterogeneous among patients in this family. The diagnosis of BOS should combine gene tests with clinical phenotypes analysis.
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Affiliation(s)
- J Ma
- Department of Otorhinolaryngology Head and Neck Surgery, Kunming Children's Hospital, Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - R Huang
- Department of Otorhinolaryngology Head and Neck Surgery, Kunming Children's Hospital, Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - X L Ma
- Department of Otorhinolaryngology Head and Neck Surgery, Kunming Children's Hospital, Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - X Li
- Department of Otorhinolaryngology Head and Neck Surgery, Kunming Children's Hospital, Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - T S Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Kunming Children's Hospital, Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - B Ruan
- Department of Otorhinolaryngology, the First Hospital of Kunming Medical University, Kunming 650032, China
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Liu J, Wu P, Guo Q, Lai X, Ruan B, Wang H, Rehman S, Chen M. Kaolinite weakens the co-stress of ampicillin and tetracycline on Escherichia coli through multiple pathways. Environ Sci Pollut Res Int 2021; 28:25228-25240. [PMID: 33453031 DOI: 10.1007/s11356-021-12356-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 01/02/2021] [Indexed: 06/12/2023]
Abstract
Ampicillin and tetracycline are common antibiotics and can threaten humans by inducing antibiotic resistance in bacteria. Microorganisms are usually exposed to a mixed antibiotic system in the environment. However, there are few researches on the specific regulatory mechanisms of clay on microorganisms under the stress of complex antibiotics. In this study, tandem mass tag-based coupled with two-dimensional liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) was employed to recognize and quantify changes in protein expression of Escherichia coli (E. coli) after culture for 15 days, with or without kaolinite in the co-stress of ampicillin and tetracycline. The results indicated that kaolinite could activate metabolic pathways of E. coli such as the energy metabolism, the biosynthesis of other secondary metabolites, and the metabolism of cofactors and vitamins. Particularly, the fatty acid degradation pathway has also been promoted, indicating that in the same unfavorable environment, kaolinite might influence the composition of E. coli cell membranes. This might be due to the change in membrane composition that was a kind of adaptive strategy of bacterial evolution. Moreover, kaolinite could promote multidrug efflux system to export the bacterial intracellular toxic substances, making E. coli survive better in an adverse environment. Consequently, this study not only disclosed the regulation of kaolinite on E. coli in a complex antibiotic environment but also provided new insights into the environmental process of antibiotic resistance.
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Affiliation(s)
- Juan Liu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, People's Republic of China.
- Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou, 510006, People's Republic of China.
- Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou, 510006, People's Republic of China.
| | - Qing Guo
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Xiaolin Lai
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Huimin Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Saeed Rehman
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Meiqing Chen
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
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Ma J, Ming C, Lin K, Zhao LP, Bi XY, Li G, Zhang TS, Ruan B. [Analysis of genetic characteristics in two Chinese children of type Ⅱ Waardenburg syndrome]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 56:47-54. [PMID: 33472302 DOI: 10.3760/cma.j.cn115330-20200121-00041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To screen and analyze the mutations of MITF gene in two children of type Ⅱ Waardenburg syndrome (WS2) from different families in Yunnan,China,and to explore the possible molecular pathogenesis. Methods: With informed consent, medical history collection, physical examinations, audiological evaluation, and high resolution computer tomography (HRCT) scan of temporal bone were performed on the two WS2 probands and their family members. Genomic DNA was extracted from peripheral blood of all individuals. The coding regions including all exons, part of introns and promoters of MITF, PAX3, SOX10, SNAI2, END3, ENDRB, and KITLG genes were sequenced by high-throughput sequencing. According to the results of high-throughput sequencing, pathogenic mutations detected in the probands and their parents were verified by Sanger sequencing. Results: The proband 1 carried c.641_643delGAA mutation in the 7th exon of MITF gene, which was a frame-shift mutation resulting in an amino acid change of p.214delR. It was a de novo mutation as the parents of proband 1 showed no variation on this site. The proband 2 carried heterozygous loss of the large fragment ranging from exon 1 to exon 9 of MITF gene, which defected the function of MITF protein. Conclusion: Genetic examinations provide important evidence for diagnosis of Waardenburg syndrome. Heterozygous mutation c.641_643delGAA and heterozygous loss of the large fragment ranging from exon 1 to exon 9 of MITF gene might be the molecular pathogenesis of the two WS2 probands in this study.
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Affiliation(s)
- J Ma
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China Kunming Key Laboratory for Prevention and Control of Congenital Birth Defects of Children, Kunming 650228, China
| | - C Ming
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China
| | - K Lin
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China
| | - L P Zhao
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China
| | - X Y Bi
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China
| | - G Li
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China
| | - T S Zhang
- Department of Otorhinolaryngology Head Neck Surgery, Kunming Children's Hospital, Kunming 650228, China Yunnan Key Laboratory of Children's Major Disease Research, Kunming 650228, China
| | - B Ruan
- Department of Otorhinolaryngology, the First Hospital of Kunming Medical University, Kunming 650032, China;Ma Jing and Ming Cheng contributed equally to this article
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Song FR, Qiu W, Ruan B, Zhu WM, Yang GJ, Li L, Geng WH, Zhao HY. [A comparative study on diagnosis of silicosis by digital and high kV film-screen chest radiography]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2021; 38:919-921. [PMID: 33406553 DOI: 10.3760/cma.j.cn121094-20190613-00226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the feasibility of soft copy image of chest digital radiography (DR(SC)) in pneumoconiosis diagnosis by observing the reading effect of DR(SC) and comparing it with high kV film-screen chest radiography (FSR(HkV)) . To provide a basis for the establishment of a regional information network platform for pneumoconiosis diagnosis. Methods: A total of 119 miners who were exposed to silica dust and engaged in copper or lead-zinc mining were collected by the Third People's Hospital of Yunnan from October 2017 to August 2019. The pulmonary X-ray findings of DRSC and FSR(HkV) in each case were independently judged and diagnosed by three experienced diagnostic physicians, and the final decision was made according to the consensus of most doctors. The consistency of the two imaging methods was analyzed by observing the main small opacity shape, the overall density, the range of distribution, the aggregation of the small opacity and the big opacity, and the diagnosis stage. Results: there were 118 males and 1 female with an average age of 46.21 years. Average exposure time 7.38 years. The pulmonary X-ray findings of 113 cases with two imaging methods were mainly the round small opacity of p,q and r,but the reticular irregular opacity were not prominent, Only one case of FSR(HkV) judgment p shape and DR(SC) judgment q shape were observed, The coincidence rate was 99.12% (112/113) . huger opacity were observed in the other 6 cases. The coincidence rate was 95.51% (4/89) between pneumoconiosis-free and stageⅠ, and there was no significant difference between stageⅡand stage Ⅲ (30/30, P>0.05) . Conclusion: The x-ray findings of Silicosis with small round shadow in lung can be used by DR(SC) in diagnosis and staging.
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Affiliation(s)
- F R Song
- Outpatient Department of The Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - W Qiu
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - B Ruan
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - W M Zhu
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - G J Yang
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - L Li
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - W H Geng
- Occupational Diseases Department of Third People's Hospital of Yunnan Province, Kunming 650011, China
| | - H Y Zhao
- Outpatient Department of The Third People's Hospital of Yunnan Province, Kunming 650011, China
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Liu J, Huang Z, Ruan B, Wang H, Chen M, Rehman S, Wu P. Quantitative proteomic analysis reveals the mechanisms of polymyxin B toxicity to Escherichia coli. Chemosphere 2020; 259:127449. [PMID: 32622246 DOI: 10.1016/j.chemosphere.2020.127449] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/10/2020] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
Polymyxin B is increasingly employed all over the world to treat patients who affected by multidrug-resistant Gram-negative bacteria. Although the mechanism of resistance to polymyxin B is well known, the metabolic role of bacteria in stress response to polymyxin B remains an important task and may help to better understand polymyxin B-related stress response. In this study, the proteome changes of Escherichia coli (E. coli) continuously induced in concentrations of 1.0 mg/L and 10.0 mg/L polymyxin B were revealed. Compared to E. coli (PMB0), E. coli exposed to polymyxin B at 1.0 mg/L (PMB1) and 10.0 mg/L (PMB10) resulted in 89 and 314 differentially expressed proteins (DEPs), respectively. Such differences related to fatty acid degradation, quorum sensing and two-component regulatory system pathways. Based on absolute quantitative (iTRAQ) proteomics analysis, this study comprehensively studied the changes of E. coli proteome in culture with concentrations of 1.0 mg/L and 10.0 mg/L polymyxin B through confocal laser scanning microscopy observation, cell viability detection and reactive oxygen species analysis. The results showed that E. coli cultured at concentration of 10.0 mg/L polymyxin B increased the expression levels of multidrug-resistant efflux transporters and efflux pump membrane transporters, which might further improve the pathogens of polymyxin B-resistant bacteria lastingness and evolution. It has emerged globally to resist polymyxin B. The reuse of polymyxin B should be aroused public attention to avoid causing more serious environmental pollution. These findings could provide new insights into polymyxin B-related stress.
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Affiliation(s)
- Juan Liu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Zhiyan Huang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Huimin Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Meiqing Chen
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Saeed Rehman
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou, 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou, 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou, 510006, PR China.
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Zhang Y, Huang Z, Ruan B, Zhang X, Jiang T, Ma N, Tsai FC. Design and Synthesis of Polyimide Covalent Organic Frameworks. Macromol Rapid Commun 2020; 41:e2000402. [PMID: 33058422 DOI: 10.1002/marc.202000402] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/20/2020] [Indexed: 02/06/2023]
Abstract
As a subseries of the covalent organic framework (COF) material family, polyimide-based covalent organic framework (PI-COF) material, which has the advantages of high stability of polyimide, high specific surface area, and controllable pores of COF material, is expected to be a new type of porous material with potential applications. Although the development of PI-COF is in the early stages during the past decade, it has attracted extensive attention and is widely used in heterogeneous catalysis, gas separation, and storage fields. Therefore, this review is aiming to give a comprehensive understanding of the recent progress of PI-COFs. This article summarizes the progress of PI-COF from three aspects: controllable structure design, synthesis method, and application. First of all, under the guidance of network chemical design principles, the topology type of PI-COF and the size and shape of the formed pores are summarized in terms of different organic monomers. Then the five synthetic strategies for the synthesis of PI-COF are analyzed. Finally, the applications of PI-COF in adsorption and separation, drug delivery, solar-to-electrochemical energy storage, photocatalysis, and electrocatalyst are introduced.
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Affiliation(s)
- Ya Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China.,Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Zhe Huang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China
| | - Bo Ruan
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China
| | - Xinke Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China
| | - Tao Jiang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China
| | - Ning Ma
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China.,Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Fang-Chang Tsai
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, P. R. China
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Ruan B, Yang J, Zhang YJ, Ma N, Shi D, Jiang T, Tsai FC. UiO-66 derivate as a fluorescent probe for Fe3+ detection. Talanta 2020; 218:121207. [DOI: 10.1016/j.talanta.2020.121207] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/17/2020] [Accepted: 05/20/2020] [Indexed: 01/07/2023]
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Ruan B, Wu P, Liu J, Jiang L, Wang H, Qiao J, Zhu N, Dang Z, Luo H, Yi X. Adhesion of Sphingomonas sp. GY2B onto montmorillonite: A combination study by thermodynamics and the extended DLVO theory. Colloids Surf B Biointerfaces 2020; 192:111085. [PMID: 32361501 DOI: 10.1016/j.colsurfb.2020.111085] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 04/23/2020] [Accepted: 04/23/2020] [Indexed: 11/25/2022]
Abstract
Bacterial adhesion on mineral surface are of fundamental importance in geochemical processes and biogeochemical cycling, such as mineral transformation and clay-mediated biodegradation. In this study, thermodynamics analysis combined with classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory as well as the extended DLVO (XDLVO) theory were employed to investigate the adhesion of the Gram-negative PAH-degrading bacteria Sphingomonas sp. GY2B on montmorillonite (Mt). Scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS) indicated the affinity of GY2B for Mt, and the experimental results could be described well by pseudo-second-order (R2 = 0.997) and Langmuir model (R2 = 0.995). The thermodynamics analysis revealed the physical nature of bacterial adhesion onto Mt, which was confirmed by the XDLVO theory. The related surface properties (Zeta potential, hydrodynamic diameter and hydrophobicity) at different ionic strength were determined and the interaction energy between Mt and GY2B were also calculated using the DLVO and XDLVO theories in KCl or CaCl2 solution. At low ionic strength (≤ 20 mM), GY2B adhesion onto Mt was primarily driven by long-range DLVO forces (e.g. electrostatic repulsion), while short-range (separation distance < 5 nm) Van der Waals and hydrophobic interactions played more important roles in the bacterial adhesion at higher ionic strength (50-100 mM). In addition, Mt had a better adhesion capacity to bacteria in Ca2+ solution than that in K+ solution, owing to less negative charge and lower energy barrier in mineral-bacteria system in Ca2+ solution. Overall, the adhesion of bacteria onto Mt could be evaluated well on the basis of the XDLVO theory along with thermodynamics analysis. This study provides valuable insights into the clay-mediated microbial remediation of hydrophobic organic contaminants in the environment.
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Affiliation(s)
- Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Foshan Environmental Research Institute, Foshan Environmental Protection Investment Co., Ltd, Foshan 528000, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China.
| | - Juan Liu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Lu Jiang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Huimin Wang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Jialiang Qiao
- Foshan Environmental Research Institute, Foshan Environmental Protection Investment Co., Ltd, Foshan 528000, PR China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Hanjin Luo
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Xiaoyun Yi
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
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Ruan B, Liu HL, Xie L, Ding H, Zhang Y, Wu J, Huang Z, Shi D, Jiang T, Tsai FC. The Fluorescence Property of Zirconium-Based MOFs Adsorbed Sulforhodamine B. J Fluoresc 2020; 30:427-435. [PMID: 32314138 DOI: 10.1007/s10895-020-02531-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 03/26/2020] [Indexed: 12/14/2022]
Abstract
Sulforhodamine B (SRB) is widely utilized for cell staining and laser field. But its application is limited by aggregation-caused quenching (ACQ). In this work, we evaluated the use of UiO-66 and UiO-67 of Zr-based metal organic frameworks (Zr-MOFs) as the host to adsorb SRB molecules due to the high stabily and good loading capacity of Zr-MOFs. The fluorescence properties of the compounds were then discussed respectively. Due to the aperture difference between UiO-66 and UiO-67, they showed distinct fluorescence properties after loading SRB. When the concentration reaches 5 ppm, fluorescence quenching begins to occur in SRB@UiO-66, while it occurs in SRB@UiO-67 at 2 ppm. The solution of quenching phenomenon could open new avenues for the extensive use of SRB.
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Affiliation(s)
- Bo Ruan
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Huan-Li Liu
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Lei Xie
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Hui Ding
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Ya Zhang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Jin Wu
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Zhe Huang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Dean Shi
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Tao Jiang
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
| | - Fang-Chang Tsai
- Hubei Key Laboratory of Polymer Materials, Key Laboratory for the Green Preparation and Application of Functional Materials (Ministry of Education), Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China.
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Yang Q, Wu P, Liu J, Rehman S, Ahmed Z, Ruan B, Zhu N. Batch interaction of emerging tetracycline contaminant with novel phosphoric acid activated corn straw porous carbon: Adsorption rate and nature of mechanism. Environ Res 2020; 181:108899. [PMID: 31740041 DOI: 10.1016/j.envres.2019.108899] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 10/28/2019] [Accepted: 11/04/2019] [Indexed: 05/13/2023]
Abstract
In this work, corn straw (CS) based porous carbon was prepared by one-step phosphoric acid (H3PO4) low temperature activation. The impregnation ratios (H3PO4/CS, g/g) played an important role in the pore development. ACS300-1 engineered at 300 °C and the impregnation ratio of 1.0 showed the maximal specific surface area of 463.89 m2/g with total pore volume of 0.387 cm3/g, attaining a high tetracycline (TC) uptake of 227.3 mg/g. The adsorption of TC onto ACS300-1 was found tolerant with wide pH (2.0-10.0) and high ionic strength (0 - 0.5 M). The adsorption data can be fitted well by the pseudo-second order kinetic model and Langmuir isotherm model. The endothermic and spontaneous properties of the adsorption system was implied by Thermodynamic study. The findings of the current work conclude that one-step H3PO4 activation is a green and promising method for corn straw based porous carbon that may be found with great potentials in antibiotic containing wastewater treatment.
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Affiliation(s)
- Qiliang Yang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou, 510006, China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou, 510006, China.
| | - Juan Liu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Saeed Rehman
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Zubair Ahmed
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
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Wang H, Wu P, Liu J, Yang S, Ruan B, Rehman S, Liu L, Zhu N. The regulatory mechanism of Chryseobacterium sp. resistance mediated by montmorillonite upon cadmium stress. Chemosphere 2020; 240:124851. [PMID: 31546187 DOI: 10.1016/j.chemosphere.2019.124851] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 09/09/2019] [Accepted: 09/12/2019] [Indexed: 06/10/2023]
Abstract
Cadmium (Cd) is a toxic heavy metal and its uptake by living organisms causes adverse effect, further resulting in cycle pollution of the biosphere. The specific regulatory mechanism between clays and microbes under Cd stress remains unclear. In this study, interface interactions among clays, microbes and Cd were confirmed. Comparative transcriptome was conducted to investigate how it regulated gene expression patterns of microbes (Chryseobacterium sp. WAL2), which exposed to a series of gradient concentrations of Cd (16, 32, 64 and 128 μg mL-1) for 12 d in the presence and absence of clay montmorillonite (Mt) (16 g L-1). Cd was highly enriched by the unique interface interactions between Mt and bacteria (67.6-82.1%), leading to a more hostile environment for bacterial cells. However, Mt ultimately enhanced bacterial resistance to Cd stress by stimulating the mechanism of bacterial resistance; namely: (i) Mt increased genes expression connected with ion transport, enhancing the uptake of Cd; (ii) Mt stimulated genes expression related to efflux pump and positively regulated cellular oxidative stress (e.g., glutathione) and Cd accumulation (e.g., cysteine) processes. Further, genes expression related to intracellular metabolic processes was enforced, which supplied a driving force and accelerated electron transfer; (iii) Mt improved genes expression involved in DNA replication and other biological processes (e.g., terpenoid backbone biosynthesis) to maintain bacterial vitality. Therefore, the study not only optimized a unique Cd resistance mechanism of Mt on Chryseobacterium sp., but also provided a novel insight for environmental mitigation of heavy metals from the perspective of molecular biology.
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Affiliation(s)
- Huimin Wang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou, 510006, PR China.
| | - Juan Liu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
| | - Shanshan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
| | - Saeed Rehman
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
| | - Liangting Liu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, PR China
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Ruan B, Wang R, Yang YJ, Wang DF, Wang JW, Zhang CC, Yuan D, Zhou ZY, Wang T. [Improved effects of saponins from Panax japonicus on decline of cognitive function in natural aging rats via NLRP3 inflammasome pathway]. Zhongguo Zhong Yao Za Zhi 2019; 44:344-349. [PMID: 30989956 DOI: 10.19540/j.cnki.cjcmm.20180921.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this paper was to investigate the effect of total saponins from Panax japonicus( SPJ) on cognitive decline of natural aging rats and its mechanism. Thirty male SD rats of eighteen month old were randomly divided into three groups: aged group,10 mg·kg~(-1) SPJ-treated group and 30 mg·kg~(-1) SPJ-treated group. The SPJ-treated groups were given SPJ at the dosages of 10 mg·kg~(-1) and 30 mg·kg~(-1),respectively,from the age of 18 to 24 months. Aged group were lavaged the same amount of saline,10 six-month-old rats were used as control group,with 10 rats in each group. The open field test,novel object recognition and Morris water maze were performed to detect the changes of cognitive function in each group. The changes of synaptic transmission of long-term potentiation( LTP) in hippocampal CA1 region were detected by field potential recording. Western blot was used to detect the protein levels of NLRP3,ASC,caspase-1 and the changes of Glu A1,Glu A2,CAMKⅡ,CREB and phosphorylation of CAMKⅡ,CREB in each group.The results showed that SPJ could improve the decline of cognitive function in aging rats,reduce the damage of LTP in the hippocampal CA1 region of aged rats,and decrease the expression of NLRP3,ASC,caspase-1 in aging rats. At the same time,SPJ could enhance the membrane expression of AMPA receptor( Glu A1 and Glu A2),and increase the expression of p-CAMKⅡand p-CREB in aging rats.SPJ could improve cognitive decline of natural aging rats,and its mechanism may be related to regulating NLRP3 inflammasome,thus regulating the membrane expression of AMPA receptor,and enhancing the expression phosphorylation of CAMKⅡ and CREB.
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Affiliation(s)
- Bo Ruan
- Medical College,Three Gorges University Yichang 443002,China
| | - Rui Wang
- Medical College,Three Gorges University Yichang 443002,China
| | - Yuan-Jian Yang
- Department of Medical Experimental Center,Jiangxi Mental Hospital Nanchang 330029,China
| | - Dong-Fan Wang
- Medical College,Three Gorges University Yichang 443002,China
| | - Jia-Wen Wang
- Medical College,Three Gorges University Yichang 443002,China
| | | | - Ding Yuan
- Renhe Hospital,Three Gorges University Yichang 443001,China
| | - Zhi-Yong Zhou
- Medical College,Three Gorges University Yichang 443002,China
| | - Ting Wang
- Medical College,Three Gorges University Yichang 443002,China
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20
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Ruan B, Wu P, Chen M, Lai X, Chen L, Yu L, Gong B, Kang C, Dang Z, Shi Z, Liu Z. Immobilization of Sphingomonas sp. GY2B in polyvinyl alcohol-alginate-kaolin beads for efficient degradation of phenol against unfavorable environmental factors. Ecotoxicol Environ Saf 2018; 162:103-111. [PMID: 29990721 DOI: 10.1016/j.ecoenv.2018.06.058] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 05/19/2018] [Accepted: 06/20/2018] [Indexed: 05/17/2023]
Abstract
In this study, batch experiments were carried out to evaluate the biodegradation of phenol by Sphingomonas sp. GY2B, which were immobilized in polyvinyl alcohol (PVA)-sodium alginate-kaolin beads under different conditions. The optimal degradation performance was achieved by GY2B immobilized in beads containing 1.0% (w/v) of kaolin, 10% (w/v) of PVA, 0.3% (w/v) of sodium alginate, 10% (v/v) of biomass dosage, and exposed to an initial phenol concentration of 100 mg/L. The experimental results indicated that PVA-sodium alginate-kaolin beads can accelerate the degradation rate of phenol by reducing the degradation time and also improve degradation rate. The biodegradation rate of phenol by immobilized cells (16.79 ± 0.81 mg/(L·h)) was significantly higher than that of free cells (11.49 ± 1.29 mg/(L·h)) under the above optimal conditions. GY2B immobilized on beads was more competent than free GY2B in degradation under conditions with high phenol concentrations (up to 300 mg/L) and in strong acidic (pH = 1) and alkaline (pH = 12) environments. Higher phenol concentrations inhibit the biomass and reduce the biodegradation rate, while the lower biodegradation rate at low initial phenol concentrations is attributed to mass transfer limitations. The Haldane inhibitory model was in agreement with the experimental data well, revealing that phenol showed a considerable inhibitory effect on the biodegradation by Sphingomonas sp. GY2B, especially at concentrations higher than 90 mg/L. Intra-particle diffusion model analysis suggests that adsorption of phenol by immobilized beads was controlled by both rapid surface adsorption as well as pore diffusion mechanism. It's worth noting that the presence of 1 mg/L Cr(VI) enhanced the biodegradation of phenol by free cells, while Cr(VI) showed no obvious impact on the removal of phenol by immobilized cells. In addition, immobilized cells were reused 16 times and removed 99.5% phenol, and when stored at 4 °C for 90 days, more than 99% phenol was removed. These results showed that immobilized cells can significantly improve the microbial degradation performance, and protect microorganisms against unfavorable environment. It is implied that PVA -sodium alginate-kaolin beads have great potential to be applied in a practical and economical phenolic wastewater treatment system.
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Affiliation(s)
- Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China.
| | - Meiqing Chen
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Xiaolin Lai
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Liya Chen
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Langfeng Yu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Chunxi Kang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Zhenqing Shi
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Zehua Liu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
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21
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Long RQ, Ruan B, Liu ZH, Li SL, Zhang F, Yang J, Gao JY. [The technique of retaining part of the external auditory canal posterior wall with epitympanoplasty in soft wall reconstruction treating middle ear cholesteatoma]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:23-27. [PMID: 29798205 DOI: 10.13201/j.issn.1001-1781.2018.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Indexed: 11/12/2022]
Abstract
Objective:To investigate the surgical treatment of cholesteatoma of the middle ear. Method:A retrospective analysis of patients from June 2013 to July 2016 diagnosed as cholesteatoma. 137 ears were divided into A group (retaining part of the external auditory canal posterior wall with epitympanoplasty in soft wall reconstruction for 75 ears) and B group (canal wall down mastoidotympanoplasty for 62 ears). the extent and damage of cholesteatoma were observed, comparing the time of dry ear and epithelial postoperative, the incidence of complications such as dizziness and hearing changes. Result:compared with B group, the postoperative dry ear time, epithelial time and hearing improvement in the A group were obviously improved, and the incidence of vertigo after operation was decreased, and the anatomical and physiological functions of the external auditory canal were protected. Conclusiont:The technique of retaining part of the external auditory canal posterior wall with epitympanoplasty in soft wall reconstruction is conductive to the removal of lesions and normal anatomical and physiological protection to external auditory canal, can prevent the forming of the abstraction pocket effectively and the recurrence of cholesteatoma, has clinical and practical value.
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Affiliation(s)
- R Q Long
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - B Ruan
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - Z H Liu
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - S L Li
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - F Zhang
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - J Yang
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
| | - J Y Gao
- Department of Otolaryngology, the First Hospital of Kunming Medical University, Kunming, 650032, China
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22
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Yu DS, Liu ZH, Long RQ, Li SL, Wang LZ, Cui X, Ruan B. [A case of fatal massive hemorrhage in the biopsy surgery due to the misdiagnosis of hypopharynx hemangioma]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 53:785-786. [PMID: 30347540 DOI: 10.3760/cma.j.issn.1673-0860.2018.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- D S Yu
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - Z H Liu
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - R Q Long
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - S L Li
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - L Z Wang
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - X Cui
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
| | - B Ruan
- Department of Otorhinolaryngology, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
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23
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Zhan JQ, Zheng LL, Chen HB, Yu B, Wang W, Wang T, Ruan B, Pan BX, Chen JR, Li XF, Wei B, Yang YJ. Hydrogen Sulfide Reverses Aging-Associated Amygdalar Synaptic Plasticity and Fear Memory Deficits in Rats. Front Neurosci 2018; 12:390. [PMID: 29930496 PMCID: PMC5999728 DOI: 10.3389/fnins.2018.00390] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/22/2018] [Indexed: 01/05/2023] Open
Abstract
As an endogenous neuromodulator, hydrogen sulfide (H2S) exerts multiple biological effects in the brain. Previous studies have shown that H2S is involved in the regulation of neural synaptic plasticity and cognition in healthy rodents. It is well known that there is a progressive decline of cognitive function that occurs with increased age. The purpose of this study was to investigate the role of H2S in aging-associated amygdalar synaptic plasticity and cued fear memory deficits as well as to explore the underlying mechanisms. We found that H2S levels in the amygdala were significantly lower in aged rats when compared with healthy adult rates, which displayed significant deficits in long-term potentiation (LTP) in the thalamo-lateral amygdala (LA) pathway and amygdala-dependent cued fear memory. Bath application of an H2S donor, sodium hydrogen sulfide (NaHS), significantly reversed the impaired LTP in brain slices from aged rats, and intra-LA infusion of NaHS restored the cued fear memory in aged rats. Mechanismly, we found that H2S treatment significantly enhanced NMDAR-mediated synaptic responses in the thalamo-LA pathway of aged rats. Notably, GluN2B-containing NMDARs, but not GluN2A-containing NMDARs, contributed to the effects of H2S on aging-associated impairments of amygdalar LTP and fear memory, because applying GluN2B antagonist could abolish the beneficial effects of NaHS treatment on amygdalar LTP and cognitive performance in aged rats. Collectively, these results show that H2S can reverse aging-associated amygdalar synaptic plasticity and fear memory deficits by restoring the function of GluN2B-containing NMDARs, suggesting that supplement of H2S might be a therapeutic approach for aging-related cognitive disorders.
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Affiliation(s)
- Jin-Qiong Zhan
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
| | - Li-Li Zheng
- Department of Pharmacy, Jiangxi Maternal and Child Health Hospital, Nanchang, China
| | - Hai-Bo Chen
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
| | - Bin Yu
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
| | - Wei Wang
- Department of Neurology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Ting Wang
- Department of Pharmacology, College of Medical Science, China Three Gorges University, Yichang, China
| | - Bo Ruan
- Department of Pharmacology, College of Medical Science, China Three Gorges University, Yichang, China
| | - Bin-Xing Pan
- Laboratory of Fear and Anxiety Disorders, Institute of Life Science, Nanchang University, Nanchang, China
| | - Juan-Ru Chen
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
| | - Xue-Fen Li
- Department of Neurology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Bo Wei
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
| | - Yuan-Jian Yang
- Biological Psychiatry Laboratory, Department of Psychiatry, Jiangxi Mental Hospital/Affiliated Mental Hospital of Nanchang University, Nanchang, China
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24
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Gong B, Wu P, Ruan B, Zhang Y, Lai X, Yu L, Li Y, Dang Z. Differential regulation of phenanthrene biodegradation process by kaolinite and quartz and the underlying mechanism. J Hazard Mater 2018; 349:51-59. [PMID: 29414752 DOI: 10.1016/j.jhazmat.2018.01.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 12/26/2017] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
Natural and cost-effective materials such as minerals can serve as supportive matrices to enhance biodegradation of polycyclic aromatic hydrocarbons (PAHs). In this study we evaluated and compared the regulatory role of two common soil minerals, i.e. kaolinite and quartz in phenanthrene (a model PAH) degradation by a PAH degrader Sphingomonas sp. GY2B and investigated the underlying mechanism. Overall kaolinite was more effective than quartz in promoting phenanthrene degradation and bacterial growth. And it was revealed that a more intimate association was established between GY2B and kaolinite. Si and O atoms on mineral surface were demonstrated to be involved in GY2B-mineral interaction. There was an higher polysaccharide/lipid content in the EPS (extracellular polymeric substances) secreted by GY2B on kaolinite than on quartz. Altogether, these results showed that differential bacterial growth, enzymatic activity, EPS composition as well as the interface interaction may explain the effects minerals have on PAH biodegradation. It was implicated that different interface interaction between different minerals and bacteria can affect microbial behavior, which ultimately results in different biodegradation efficiency.
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Affiliation(s)
- Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510642, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Yating Zhang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China
| | - Xiaolin Lai
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Langfeng Yu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Yongtao Li
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
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Jiang HY, Peng CT, Zhang X, Ruan B. Antidepressant use during pregnancy and the risk of attention-deficit/hyperactivity disorder in the children: a meta-analysis of cohort studies. BJOG 2018; 125:1077-1084. [PMID: 29243299 DOI: 10.1111/1471-0528.15059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2017] [Indexed: 01/17/2023]
Abstract
BACKGROUND Evidence for the relationship between antidepressant use during pregnancy and the risk of attention-deficit/hyperactivity disorder (ADHD) in the children is conflicting. OBJECTIVE To assess the association between fetal exposure to antidepressant drugs and the subsequent development of ADHD. SEARCH STRATEGY A systematic literature search was conducted in PubMed, EMBASE, PsycINFO, and CINAHL databases to identify relevant cohort studies published from inception until October 2017. SELECTION CRITERIA Cohort studies, identifying children with ADHD diagnosis and linking antidepressant use during pregnancy in their mothers. DATA COLLECTION Two reviewers independently abstracted data and assessed study quality. MAIN RESULTS The literature search identified six relevant cohort studies with association between antidepressant exposure during pregnancy and the risk of ADHD in children [hazard ratio (HR) 1.34; 95% confidence interval (CI) 1.14-1.57]. However, the association was not statistically significant when the reference group was mothers with psychiatric disorders not treated during pregnancy (HR 0.96; 95% CI 0.76-1.2; n = 2 studies). Moreover, preconception exposure to antidepressants was significantly associated with increased risk of ADHD (HR 1.82; 95% CI 1.54-2.15; n = 3 studies). CONCLUSIONS The significant association between antidepressant exposure during pregnancy and ADHD in the children can be partially explained by confounding by indication. Given the low number of included studies, further studies with prospective designs that use validated measurements and controls for important confounders are needed to verify our findings. TWEETABLE ABSTRACT Antidepressant use during pregnancy may be not associated with ADHD in the offspring.
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Affiliation(s)
- H-Y Jiang
- Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - C-T Peng
- Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - X Zhang
- Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - B Ruan
- Collaborative Innovation Centre for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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Chen P, Zhu JW, Chen T, Wang DF, Yang LP, Ruan B, Yu CB, Li LJ. [Clinical value of health-related quality of life evaluation in community patients with hepatitis B]. Zhonghua Gan Zang Bing Za Zhi 2018; 25:313-316. [PMID: 28494556 DOI: 10.3760/cma.j.issn.1007-3418.2017.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Chronic hepatitis B (CHB) is a major infectious disease which threatens people's health around the world. Health-related quality of life (HRQoL) has become an important index for evaluating the treatment and prognosis of patients with CHB. Many studies abroad have shown that the HRQoL of patients with CHB is influenced by various factors. Disease severity, clinical symptoms, and low self-efficacy are important influencing factors for patients' quality of life. Anti-viral therapy, proper physical therapy, or psychological intervention can significantly improve the HRQoL of community CHB patients, and HRQoL is even significantly improved in patients undergoing liver transplantation one year ago. These studies provide valid evidence for antiviral therapy for hepatitis B patients and liver transplantation techniques from the psychological level. At present, there still lacks studies on HRQoL of CHB patients in China. This article summarizes the measurement tools for HRQoL widely used in recent years in China and foreign countries, reviews the research advances in HRQoL in community patients with CHB, and discusses the perspectives for future studies.
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Affiliation(s)
- P Chen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - J W Zhu
- Zhejiang University School of Medicine, Hangzhou 310029, China
| | - T Chen
- Zhejiang University School of Medicine, Hangzhou 310029, China
| | - D F Wang
- Xianju People's Hospital, Taizhou 317300, China
| | - L P Yang
- Nanxun Center for Disease Control and Prevention, Huzhou 313009, China
| | - B Ruan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - C B Yu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - L J Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
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Chen M, Wu P, Yu L, Liu S, Ruan B, Hu H, Zhu N, Lin Z. FeOOH-loaded MnO 2 nano-composite: An efficient emergency material for thallium pollution incident. J Environ Manage 2017; 192:31-38. [PMID: 28131980 DOI: 10.1016/j.jenvman.2017.01.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 01/16/2017] [Accepted: 01/18/2017] [Indexed: 06/06/2023]
Abstract
A FeOOH-loaded MnO2 nano-composite was developed as an emergency material for Tl(I) pollution incident. Structural characterizations showed that FeOOH successfully loaded onto MnO2, the nanosheet-flower structure and high surface area (191 m2 g-1) of material contributed to the excellent performance for Tl(I) removal. FeOOH-loaded MnO2 with a Fe/Mn molar ratio of 1:2 exhibited a noticeable enhanced capacity for Tl(I) removal compared to that of pure MnO2. The outstanding performance for Tl(I) removal involves in extremely high efficiency (achieved equilibrium and drinking water standard within 4 min) and the large maximum adsorption capacity (450 mg g-1). Both the control-experiment and XPS characterization proved that the removal mechanism of Tl(I) on FeOOH-loaded MnO2 included adsorption and oxidation: the oxidation of MnO2 played an important role for Tl(I) removal, and the adsorption of FeOOH loaded on MnO2 enhanced Tl(I) purification at the same time. In-depth purification of Tl(I) had reach drinking water standards (0.1 μg L-1) at pH above 7, and there wasn't security risk produced from the dissolution of Mn2+ and Fe2+. Moreover, the as-prepared material could be utilized as a recyclable adsorbent regenerated by using NaOH-NaClO binary solution. Therefore, the synthesized FeOOH-loaded MnO2 in this study has the potential to be applied as an emergency material for thallium pollution incident.
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Affiliation(s)
- Meiqing Chen
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Pingxiao Wu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China.
| | - Langfeng Yu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Shuai Liu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Bo Ruan
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Haihui Hu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Nengwu Zhu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Zhang Lin
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
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Kang C, Wu P, Li L, Yu L, Ruan B, Gong B, Zhu N. Cr(VI) reduction and Cr(III) immobilization by resting cells of Pseudomonas aeruginosa CCTCC AB93066: spectroscopic, microscopic, and mass balance analysis. Environ Sci Pollut Res Int 2017; 24:5949-5963. [PMID: 28070813 DOI: 10.1007/s11356-016-8356-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 12/29/2016] [Indexed: 06/06/2023]
Abstract
The aim of this study was to investigate the mechanism of Cr(VI) reduction and Cr(III) immobilization by resting cells of Pseudomonas aeruginosa using batch experiments and analysis techniques. Data showed that resting cells of this strain (3.2 g/L dry weight) reduced 10 mg/L of Cr(VI) by 86% in Tris-HCl buffer solution under optimized conditions of 5 g/L of sodium acetate as an electron donor, pH of 7.0 and temperature of 37 °C within 24 h. Cr(VI) was largely converted to nontoxic Cr(III), and both soluble crude cell-free extracts and membrane-associated fractions were responsible for Cr(VI) reduction. While remnant Cr(VI) existed only in the supernatant, the content of resultant Cr(III) in supernatant, on cell surface and inside cells was 2.62, 1.06, and 5.07 mg/L, respectively, which was an indicative of extracellular and intracellular reduction of chromate. Scanning electron microscopy analysis combined with energy dispersive X-ray spectroscopy revealed the adsorption of chromium on the bacterial surface. Interaction between Cr(III) and cell surface functional groups immobilized Cr(III) as indicated by Fourier transform infrared analyses and X-ray photoelectron spectroscopy. Transmission electron microscopy revealed Cr(III) precipitates in bacterial interior suggesting that Cr(II) could also be intracellularly accumulated. Thus, it can be concluded that interior and exterior surfaces of resting P. aeruginosa cells were sites for reduction and immobilization of Cr(VI) and Cr(III), respectively. This is further insight into the underlying mechanisms of microbial chromate reduction.
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Affiliation(s)
- Chunxi Kang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.
- Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 51006, People's Republic of China.
- Guangdong Environmental Protection Key Lab of Solid Waste Treatment and Recycling, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.
| | - Liping Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Langfeng Yu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
- Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 51006, People's Republic of China
- Guangdong Environmental Protection Key Lab of Solid Waste Treatment and Recycling, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
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Gong B, Wu P, Huang Z, Li Y, Yang S, Dang Z, Ruan B, Kang C. Efficient inhibition of heavy metal release from mine tailings against acid rain exposure by triethylenetetramine intercalated montmorillonite (TETA-Mt). J Hazard Mater 2016; 318:396-406. [PMID: 27450331 DOI: 10.1016/j.jhazmat.2016.07.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 06/22/2016] [Accepted: 07/05/2016] [Indexed: 06/06/2023]
Abstract
The potential application of triethylenetetramine intercalated montmorillonite (TETA-Mt) in mine tailings treatment and AMD (acid mine drainage) remediation was investigated with batch experiments. The structural and morphological characteristics of TETA-Mt were analyzed with XRD, FTIR, DTG-TG and SEM. The inhibition efficiencies of TETA-Mt against heavy metal release from mine tailings when exposed to acid rain leaching was examined and compared with that of triethylenetetramine (TETA) and Mt. Results showed that the overall inhibition by TETA-Mt surpassed that by TETA or Mt for various heavy metal ions over an acid rain pH range of 3-5.6 and a temperature range of 25-40°C. When mine tailings were exposed to acid rain of pH 4.8 (the average rain pH of the mining site where the mine tailings were from), TETA-Mt achieved an inhibition efficiency of over 90% for Cu(2+), Zn(2+), Cd(2+) and Mn(2+) release, and 70% for Pb(2+) at 25°C. It was shown that TETA-Mt has a strong buffering capacity. Moreover, TETA-Mt was able to adsorb heavy metal ions and the adsorption process was fast, suggesting that coordination was mainly responsible. These results showed the potential of TETA-Mt in AMD mitigation, especially in acid rain affected mining area.
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Affiliation(s)
- Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Key Laboratory of Agro-Environmental Integrated Control, Guangdong Institute of Eco-Environmental Science & Technology, Guangzhou 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Centre for Environment Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Lab of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China.
| | - Zhujian Huang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Yuanyuan Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Shanshan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Chunxi Kang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
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30
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Ma J, Ruan B, Mao ZY, Li SL, Gao YQ, Lin K, Zhang TS. [Minimally invasive surgical techniques of cochlear implantation withround window pathways in young children]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:978-981. [PMID: 29771067 DOI: 10.13201/j.issn.1001-1781.2016.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Indexed: 11/12/2022]
Abstract
Objective:To discuss the minimally invasive surgical techniques and the effect of cochlear implantation with round window pathways in young children(≤3 years).Method:One hundred and sixty patients with bilateral profound sensorineural hearin loss received MED-EL cochlear implantation,including 144 cases of normal middle and inner ear,4 cases of Mondini deformity,12 cases of large vestibular aqueduct syndrome.Result:Of 160 patients underwent CIs,148 patients were performed with round window pathways,the rate was 92.5%. Iit's difficult to exposure round window in 12 patients,performing from promontory.All electrodes of 158 cases with unilateral CI and 2 cases with bilateral CI were implanted successfully,in which the CI went normally and electrode array were protected well.All implant devices had worked normally and all patients had performed well during an average follow-up period of 8 month-3 years.Post-operatively complications of cerebrospinal fluid leakage,facial nerve injury haven't been found.Conclusion:Cochlear implantation could be performed in patients wit with round window pathways,and it is a safe and effective way in young children.
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Affiliation(s)
- J Ma
- Department of Otolaryngology Head and Neck Surgery,Kunming Children's Hospital (Children's Hospital Affiliated Kunming Medical University),Kunming,650228,China
| | - B Ruan
- Department of Otolaryngology,the First Hospital Affiliated Kunming Medical University
| | - Z Y Mao
- Department of Otolaryngology Head and Neck Surgery,Kunming Children's Hospital (Children's Hospital Affiliated Kunming Medical University),Kunming,650228,China
| | - S L Li
- Department of Otolaryngology,the First Hospital Affiliated Kunming Medical University
| | - Y Q Gao
- Department of Otolaryngology Head and Neck Surgery,Kunming Children's Hospital (Children's Hospital Affiliated Kunming Medical University),Kunming,650228,China
| | - K Lin
- Department of Otolaryngology Head and Neck Surgery,Kunming Children's Hospital (Children's Hospital Affiliated Kunming Medical University),Kunming,650228,China
| | - T S Zhang
- Department of Otolaryngology Head and Neck Surgery,Kunming Children's Hospital (Children's Hospital Affiliated Kunming Medical University),Kunming,650228,China
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Shao H, Chen HZ, Zhu JS, Ruan B, Zhang ZQ, Lin X, Gan MF. Computed tomography findings of hepatic veno-occlusive disease caused by Sedum aizoon with histopathological correlation. ACTA ACUST UNITED AC 2016; 48:1145-50. [PMID: 26517336 PMCID: PMC4661032 DOI: 10.1590/1414-431x20154563] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 07/23/2015] [Indexed: 01/09/2023]
Abstract
This study investigated the value of computed tomography (CT) in the diagnosis and
treatment of hepatic veno-occlusive disease (HVOD) caused by Sedum
aizoon (SA). The clinical manifestations, treatment results, imaging
findings, and histological findings of the liver were analyzed in 39 patients with
HVOD caused by SA. Hepatomegaly, liver dysfunction, abdominal effusion, and
geographic density changes on liver CT scans were found in all 39 patients. The
pathological findings of histological liver examination included swelling and
point-like necrosis of liver cells, significant expansion and congestion of the
sinuses, endothelial swelling, and wall thickening with incomplete lumen occlusion of
small liver vessels. CT geographic density changes were confirmed by histological
examination of the liver in 18 patients. Sixteen patients with small amounts of
ascites that started within 4 weeks of treatment recovered completely or
significantly improved after symptomatic and supportive treatment. However, only
43.75% of the patients with larger amounts of ascites improved following symptomatic
and supportive treatment. In conclusion, liver CT examination is a valuable, safe,
and noninvasive tool for the diagnosis of HVOD caused by SA. In selected cases, liver
CT examination may replace liver biopsy and histological analysis.
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Affiliation(s)
- H Shao
- Department of Infectious Diseases, Taizhou Hospital Affiliated to Wenzhou Medical College, Linhai, China
| | - H Z Chen
- Department of Infectious Diseases, Taizhou Hospital Affiliated to Wenzhou Medical College, Linhai, China
| | - J S Zhu
- Department of Infectious Diseases, Taizhou Hospital Affiliated to Wenzhou Medical College, Linhai, China
| | - B Ruan
- State Key Laboratory for Diagnosis and Treatment of Infectious Disease, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Z Q Zhang
- Department of Infectious Disease, Xianju Hospital of Traditional Chinese Medicine, Xianju, China
| | - X Lin
- Department of Infectious Diseases, Taizhou Hospital Affiliated to Wenzhou Medical College, Linhai, China
| | - M F Gan
- Department of Infectious Diseases, Taizhou Hospital Affiliated to Wenzhou Medical College, Linhai, China
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Gong B, Wu P, Huang Z, Li Y, Dang Z, Ruan B, Kang C, Zhu N. Enhanced degradation of phenol by Sphingomonas sp. GY2B with resistance towards suboptimal environment through adsorption on kaolinite. Chemosphere 2016; 148:388-94. [PMID: 26826781 DOI: 10.1016/j.chemosphere.2016.01.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 12/02/2015] [Accepted: 01/04/2016] [Indexed: 05/27/2023]
Abstract
The effects of clay minerals on microbial degradation of phenol under unfavorable environmental conditions were investigated. Degradation of phenol by Sphingomonas sp. GY2B adsorbed on kaolinite, montmorillonite, and vermiculite were evaluated in comparison with free bacteria under optimal conditions. Kaolinite was found to be the most effective in accelerating degradation rate (reducing the degradation time) as well as improving degradation efficiency (increasing the percentage of phenol degraded), with GY2B/kaolinite complex achieving a degradation efficiency of 96% within 6 h. GY2B adsorbed on kaolinite was more competent than free GY2B in degradation under conditions with high phenol concentrations and at alkaline pH. Kaolinite reduced the time required for degradation by 8-12 h and improved the degradation efficiency by as much as 82% at high phenol concentrations. Meanwhile, the GY2B/kaolinite complex reduced the degradation time by 24 h and improved the degradation efficiency by 46% at pH 12. The improvement was partially due to the buffering effects of kaolinite. It was also shown that Cr(VI) and kaolinite synergistically enhanced the degradation by GY2B, with Cr(VI) and kaolinite both increasing the degradation rate and kaolinite being primarily responsible for enhanced degradation efficiency. These results showed one of the common clay minerals, kaolinite, is able to significantly improve the microbial degradation performance, and protect microorganisms against unfavorable environment. Kaolinite can collaborate with Cr(VI) to further improve the microbial degradation performance. It is implied that clay minerals have great potential to be applied in enhancing the biodegradation of phenol.
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Affiliation(s)
- Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Centre for Environment Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
| | - Zhujian Huang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Yuewu Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Chunxi Kang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Centre for Environment Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China
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Kang C, Wu P, Li Y, Ruan B, Li L, Tran L, Zhu N, Dang Z. Understanding the role of clay minerals in the chromium(VI) bioremoval by Pseudomonas aeruginosa CCTCC AB93066 under growth condition: microscopic, spectroscopic and kinetic analysis. World J Microbiol Biotechnol 2015; 31:1765-79. [PMID: 26296415 DOI: 10.1007/s11274-015-1928-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Accepted: 08/17/2015] [Indexed: 11/30/2022]
Abstract
Laboratory batch experiments were conducted to investigate the role of clay minerals, e.g., kaolinite and vermiculite, in microbial Cr(VI) reduction by Pseudomonas aeruginosa under growth condition in glucose-amended mediums as a method for treating Cr(VI)-contaminated subsurface environment such as soil. Our results indicated that glucose could acted as an essential electron donor, and clay minerals significantly enhanced microbial Cr(VI) reduction rates by improving the consumption rate of glucose and stimulating the growth and propagation of P. aeruginosa. Cr(VI) bioreduction by both free cells and clay minerals-amended cells followed the pseudo-first-order kinetic model, with the latter one fitting better. The mass balance analyses and X-ray photoelectron spectroscopy analysis found that Cr(VI) was reduced to Cr(III) and the adsorption of total chromium on clay minerals-bacteria complex was small, implying that Cr(VI) bioremoval was not mainly due to the adsorption of Cr(VI) onto cells or clay minerals or clay minerals-cells complex but mainly due to the Cr(VI) reduction capacity of P. aeruginosa under the experimental conditions studied (e.g., pH 7). Atomic force microscopy revealed that the addition of clay minerals (e.g. vermiculite) decreased the surface roughness of Cr(VI)-laden cells and changed the cell morphology and dimension. Fourier transform infrared spectroscopy revealed that organic matters such as aliphatic species and/or proteins played an important role in the combination of cells and clay minerals. Scanning electron microscopy confirmed the attachment of cells on the surface of clay minerals, indicating that clay minerals could provide a microenvironment to protect cells from Cr(VI) toxicity and serve as growth-supporting materials. These findings manifested the underlying influence of clay minerals on microbial reduction of Cr(VI) and gave an understanding of the interaction between pollutants, the environment and the biota.
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Affiliation(s)
- Chunxi Kang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China. .,The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China. .,Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 51006, People's Republic of China.
| | - Yuewu Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Bo Ruan
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Liping Li
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Lytuong Tran
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.,QuangBinh University, QuangBinh, Vietnam
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.,The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.,Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 51006, People's Republic of China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.,The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.,Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 51006, People's Republic of China
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Huang D, Ruan B, Wu X, Zhang W, Xu G, Tao Z, Jiang P, Ma L, Li W. Experimental study on heat transfer of aviation kerosene in a vertical upward tube at supercritical pressures. Chin J Chem Eng 2015. [DOI: 10.1016/j.cjche.2014.10.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Kang C, Wu P, Li Y, Ruan B, Zhu N, Dang Z. Estimates of heavy metal tolerance and chromium(VI) reducing ability of Pseudomonas aeruginosa CCTCC AB93066: chromium(VI) toxicity and environmental parameters optimization. World J Microbiol Biotechnol 2014; 30:2733-46. [DOI: 10.1007/s11274-014-1697-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 06/25/2014] [Indexed: 11/28/2022]
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36
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Li B, Wu P, Ruan B, Liu P, Zhu N. Study on the adsorption of DNA on the layered double hydroxides (LDHs). Spectrochim Acta A Mol Biomol Spectrosc 2013; 121:387-393. [PMID: 24280301 DOI: 10.1016/j.saa.2013.10.099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 10/21/2013] [Accepted: 10/31/2013] [Indexed: 06/02/2023]
Abstract
Four kinds of layered double hydroxides (LDHs) were prepared by chemical coprecipitation method and used as DNA adsorbents. Multiple characterization tools such as power X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Standard electronic modules (SEM) were employed to characterize the LDHs. By examining the effect of initial concentration, solution pH, adsorption experiments were carried out to investigate the adsorption capacities of LDHs for DNA. The results revealed that the LDHs with Mg/Al=3 had higher ability on adsorbing the DNA and were not affected by pH values. The LDHs exhibited excellent adsorption properties and completely adsorbed DNA within 2h. The adsorption equilibrium data were fitted to the Langmuir and Freundlich models, showing that the Langmuir model which represented monolayer adsorption had better correlation with the adsorption linear equation. In addition, Circular dichroism (CD) spectrum, UV-vis spectorscopy and agarose gel electrophoresis revealed the integrity of DNA structure, suggesting that there had no damage on the DNA structure during the adsorption process.
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Affiliation(s)
- Bin Li
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
| | - Pingxiao Wu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, PR China.
| | - Bo Ruan
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Paiyu Liu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Nengwu Zhu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China
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Affiliation(s)
- Hua Meng
- School of Aeronautics and Astronautics; Zhejiang University; Hangzhou; Zhejiang; 310027; China
| | - Bo Han
- School of Aeronautics and Astronautics; Zhejiang University; Hangzhou; Zhejiang; 310027; China
| | - Bo Ruan
- School of Aeronautics and Astronautics; Zhejiang University; Hangzhou; Zhejiang; 310027; China
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38
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Xie YR, Liu SL, Liu X, Luo ZB, Zhu B, Li ZF, Li LJ, He Y, Jiang L, Li H, Ruan B. Intestinal microbiota and innate immunity-related gene alteration in cirrhotic rats with liver transplantation. Transplant Proc 2012; 43:3973-9. [PMID: 22172882 DOI: 10.1016/j.transproceed.2011.08.113] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 06/17/2011] [Accepted: 08/29/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND The present study investigated the alteration of intestinal microbiota, innate immunity-related genes, and bacterial translocation in rats with cirrhosis and liver transplantation. METHODS Specific pathogen-free Sprague-Dawley rats were randomized into 4 groups: (1) normal controls (N); (2) liver cirrhosis (LC); (3) normal control groups with liver transplantation (LTN); and (4) liver cirrhosis with liver transplantation (LTC). We examined plasma endotoxin, bacterial tacslocation, denaturing gradient gel electrophoresis (DGGE) profile of intestinal mucosa-associated bacteria, abundance of key bacterial populations, and expression of innate immunity-related gene. RESULTS The LTC and LC group, showed higher endotoxin levels (1.08±0.73 EU/mL and 0.74±0.70 EU/mL, respectively) than the N group (0.27±0.13 EU/mL; P<.05). the incidence of bacterial translocation (BT) to liver and mesenteric lymph nodes (MLN), and the number of total bacteria were increased significantly in the LTC and LC groups compared with the N group (P<.05). The counts of Lactobacilli and Bacteroides were lower, whereas Enterobacteria were higher in the LC than the N group (P<.05). Mucins (MUC2, MUC3) and Toll-like receptors (TLR2, TLR4) messenger RNA (mRNA) expression were significantly higher in the LC and LTC groups than the N group (P<.05). The marked difference between the groups in the overall structure of the bacterial community was also generated by DGGE profiles. CONCLUSION Liver cirrhosis disturbs intestinal microbiota and innate immunity-related genes, which contributes to endotoxemia and bacterial translocation. These had not completely recovered in cirrhotic rats until 1 month after orthotopic liver transplantation.
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Affiliation(s)
- Y R Xie
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Infectious Disease Center, the First Affiliated Hospital of Medical School, Zhejiang University, Hangzhou, China
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Abstract
A new isoflavone, corylinin (1), along with six known compounds, isopsoralen (2), psoralen (3), sophoracoumestan A (4), neobavaisoflavone (5), daidzin (6) and uracil (7), have been isolated from the dried fruits of Psoralea corylifolia L. The structure of 1 was established as 7,4'-dihydroxy-3'-[(E)-3,7-dimethyl-2,6-octadienyl]isoflavone on the basis of the spectroscopic methods. Structures of the known compounds were identified by comparison of the literature.
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Affiliation(s)
- B Ruan
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, China
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40
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Ambrogelly A, Kamtekar S, Sauerwald A, Ruan B, Tumbula-Hansen D, Kennedy D, Ahel I, Söll D. Cys-tRNACys formation and cysteine biosynthesis in methanogenic archaea: two faces of the same problem? Cell Mol Life Sci 2004; 61:2437-45. [PMID: 15526152 DOI: 10.1007/s00018-004-4194-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aminoacyl-tRNA (transfer RNA) synthetases are essential components of the cellular translation machinery as they provide the ribosome with aminoacyl-tRNAs. Aminoacyl-tRNA synthesis is generally well understood. However, the mechanism of Cys-tRNACys formation in three methanogenic archaea ( Methanocaldococcus jannaschii, Methanothermobacter thermautotrophicus and Methanopyrus kandleri) is still unknown, since no recognizable gene for a canonical cysteinyl-tRNA synthetase could be identified in the genome sequences of these organisms. Here we review the different routes recently proposed for Cys-tRNACys formation and discuss its possible link with cysteine biosynthesis in these methanogenic archaea.
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Affiliation(s)
- A Ambrogelly
- Department of Molecular Biophysics and Biochemistry, Yale University, 266 Whitney Avenue, P.O. Box 208114, New Haven, Connecticut 06520-8114, USA
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41
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Stathopoulos C, Ahel I, Ali K, Ambrogelly A, Becker H, Bunjun S, Feng L, Herring S, Jacquin-Becker C, Kobayashi H, Korencic D, Krett B, Mejlhede N, Min B, Nakano H, Namgoong S, Polycarpo C, Raczniak G, Rinehart J, Rosas-Sandoval G, Ruan B, Sabina J, Sauerwald A, Toogood H, Tumbula-Hansen D, Ibba M, Söll D. Aminoacyl-tRNA synthesis: a postgenomic perspective. Cold Spring Harb Symp Quant Biol 2003; 66:175-83. [PMID: 12762020 DOI: 10.1101/sqb.2001.66.175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- C Stathopoulos
- Departments of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114, USA
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42
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Ruan B, Ahel I, Ambrogelly A, Becker HD, Bunjun S, Feng L, Tumbula-Hansen D, Ibba M, Korencic D, Kobayashi H, Jacquin-Becker C, Mejlhede N, Min B, Raczniak G, Rinehart J, Stathopoulos C, Li T, Söll D. Genomics and the evolution of aminoacyl-tRNA synthesis. Acta Biochim Pol 2002; 48:313-21. [PMID: 11732603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Translation is the process by which ribosomes direct protein synthesis using the genetic information contained in messenger RNA (mRNA). Transfer RNAs (tRNAs) are charged with an amino acid and brought to the ribosome, where they are paired with the corresponding trinucleotide codon in mRNA. The amino acid is attached to the nascent polypeptide and the ribosome moves on to the next codon. Thus, the sequential pairing of codons in mRNA with tRNA anticodons determines the order of amino acids in a protein. It is therefore imperative for accurate translation that tRNAs are only coupled to amino acids corresponding to the RNA anticodon. This is mostly, but not exclusively, achieved by the direct attachment of the appropriate amino acid to the 3'-end of the corresponding tRNA by the aminoacyl-tRNA synthetases. To ensure the accurate translation of genetic information, the aminoacyl-tRNA synthetases must display an extremely high level of substrate specificity. Despite this highly conserved function, recent studies arising from the analysis of whole genomes have shown a significant degree of evolutionary diversity in aminoacyl-tRNA synthesis. For example, non-canonical routes have been identified for the synthesis of Asn-tRNA, Cys-tRNA, Gln-tRNA and Lys-tRNA. Characterization of non-canonical aminoacyl-tRNA synthesis has revealed an unexpected level of evolutionary divergence and has also provided new insights into the possible precursors of contemporary aminoacyl-tRNA synthetases.
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Affiliation(s)
- B Ruan
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut, USA
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Abstract
Subtilisin BPN' contains two cation binding sites. One specifically binds calcium (site A), and the other can bind both divalent and monovalvent metals (site B). By binding at specific sites in the tertiary structure of subtilisin, cations contribute their binding energy to the stability of the native state and increase the activation energy of unfolding. Deconvoluting the influence of binding sites A and B on the inactivation rate of subtilisin is complicated, however. This paper examines the stabilizing effects of cation binding at site B by using a mutant of subtilisin BPN' which lacks calcium site A. Using this mutant, we show that calcium binding at site B has relatively little effect on stability in the presence of moderate concentrations of monovalent cations. At [NaCl] =100 mM, site B is >or=98% occupied with sodium, and therefore its net occupancy with a cation varies little as subtilisin is titrated with calcium. Exchanging sodium for calcium results in a 5-fold decrease in the rate of inactivation. In contrast, because of the high selectivity of site A for calcium, its occupancy changes dramatically as calcium concentration is varied, and consequently the inactivation rate of subtilisin decreases approximately 200-fold as site A becomes saturated with calcium, irrespective of the concentration of monovalent cations.
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Affiliation(s)
- P A Alexander
- Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, Maryland 20850, USA
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Abstract
Stability is a property of subtilisin which has proven particularly amenable to enhancement via random mutagenesis and screening, yet the effects of most stabilizing mutations are not understood in structural and energetic detail. This paper seeks to explain the longstanding observation that stabilizing mutations are usually calcium-dependent in their stabilizing effect, irrespective of their proximity to the calcium binding sites. Stabilizing mutations in subtilisin fall into one of three classes. The largest class of mutations stabilize only in the presence of excess calcium. A smaller number of mutations stabilize independently of [calcium], and a few mutations stabilize only in the presence of chelating agents, such as EDTA. This study compares the effects of mutations from each class when introduced into subtilisin BPN' and two calcium-free versions of subtilisin. The calcium-dependent effects of mutations can be explained by considering subtilisin to be in conformational equilibrium between two structurally similar but energetically distinct states: N and N*. The equilibrium from the N* to the N state can be altered either by calcium binding to site A or by mutation. Mutations which stabilize only in the presence of calcium stabilize the N state relative to N*. Mutations which stabilize only in the presence of chelants stabilize the N* state relative to N. As a byproduct of this analysis, we have developed a hyperstable variant of subtilisin whose inactivation at high temperature in the presence of EDTA is 10(5) times slower than wild-type subtilisin.
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Affiliation(s)
- P A Alexander
- Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, Maryland 20850, USA
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45
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Ruan B, Ahel I, Ambrogelly A, Becker HD, Bunjun S, Feng L, Tumbula-Hansen D, Ibba M, Korencic D, Kobayashi H, Jacquin-Becker C, Mejlhede N, Min B, Raczniak G, Rinehart J, Stathopoulos C, Li T, Söll D. Genomics and the evolution of aminoacyl-tRNA synthesis. Acta Biochim Pol 2001. [DOI: 10.18388/abp.2001_3917] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Translation is the process by which ribosomes direct protein synthesis using the genetic information contained in messenger RNA (mRNA). Transfer RNAs (tRNAs) are charged with an amino acid and brought to the ribosome, where they are paired with the corresponding trinucleotide codon in mRNA. The amino acid is attached to the nascent polypeptide and the ribosome moves on to the next codon. Thus, the sequential pairing of codons in mRNA with tRNA anticodons determines the order of amino acids in a protein. It is therefore imperative for accurate translation that tRNAs are only coupled to amino acids corresponding to the RNA anticodon. This is mostly, but not exclusively, achieved by the direct attachment of the appropriate amino acid to the 3'-end of the corresponding tRNA by the aminoacyl-tRNA synthetases. To ensure the accurate translation of genetic information, the aminoacyl-tRNA synthetases must display an extremely high level of substrate specificity. Despite this highly conserved function, recent studies arising from the analysis of whole genomes have shown a significant degree of evolutionary diversity in aminoacyl-tRNA synthesis. For example, non-canonical routes have been identified for the synthesis of Asn-tRNA, Cys-tRNA, Gln-tRNA and Lys-tRNA. Characterization of non-canonical aminoacyl-tRNA synthesis has revealed an unexpected level of evolutionary divergence and has also provided new insights into the possible precursors of contemporary aminoacyl-tRNA synthetases.
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46
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Ruan B, Wilson WK, Pang J, Gerst N, Pinkerton FD, Tsai J, Kelley RI, Whitby FG, Milewicz DM, Garbern J, Schroepfer GJ. Sterols in blood of normal and Smith-Lemli-Opitz subjects. J Lipid Res 2001; 42:799-812. [PMID: 11352988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
Smith-Lemli-Opitz syndrome (SLOS) is a hereditary disorder in which a defective gene encoding 7-dehydrocholesterol reductase causes the accumulation of noncholesterol sterols, such as 7- and 8-dehydrocholesterol. Using rigorous analytical methods in conjunction with a large collection of authentic standards, we unequivocally identified numerous noncholesterol sterols in 6 normal and 17 SLOS blood samples. Plasma or erythrocytes were saponified under oxygen-free conditions, followed by multiple chromatographic separations. Individual sterols were identified and quantitated by high performance liquid chromatography (HPLC), Ag(+)-HPLC, gas chromatography (GC), GC-mass spectrometry, and nuclear magnetic resonance. As a percentage of total sterol content, the major C(27) sterols observed in the SLOS blood samples were cholesterol (12;-98%), 7-dehydrocholesterol (0.4;-44%), 8-dehydrocholesterol (0.5;-22%), and cholesta-5,7,9(11)-trien-3beta-ol (0.02;-5%), whereas the normal blood samples contained <0.03% each of the three noncholesterol sterols. SLOS and normal blood contained similar amounts of lathosterol (0.05;-0.6%) and cholestanol (0.1;-0.4%) and approximately 0.003;-0.1% each of the Delta(8), Delta(8(14)), Delta(5,8(14)), Delta(5,24), Delta(6,8), Delta(6,8(14)), and Delta(7,24) sterols. The results are consistent with the hypothesis that the Delta(8(14)) sterol is an intermediate of cholesterol synthesis and indicate the existence of undescribed aberrant pathways that may explain the formation of the Delta(5,7,9(11)) sterol. 19-Norcholesta-5,7,9-trien-3beta-ol was absent in both SLOS and normal blood, although it was routinely observed as a GC artifact in fractions containing 8-dehydrocholesterol. The overall findings advance the understanding of SLOS and provide a methodological model for studying other metabolic disorders of cholesterol synthesis.
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Affiliation(s)
- B Ruan
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA
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Lindenthal B, Holleran AL, Aldaghlas TA, Ruan B, Schroepfer GJ, Wilson WK, Kelleher JK. Progestins block cholesterol synthesis to produce meiosis-activating sterols. FASEB J 2001; 15:775-84. [PMID: 11259396 DOI: 10.1096/fj.00-0214com] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The resumption of meiosis is regulated by meiosis-preventing and meiosis-activating substances in testes and ovaries. Certain C29 precursors of cholesterol are present at elevated levels in gonadal tissue, but the mechanism by which these meiosis-activating sterols (MAS) accumulate has remained an unresolved question. Here we report that progestins alter cholesterol synthesis in HepG2 cells and rat testes to increase levels of major MAS (FF-MAS and T-MAS). These C29 sterols accumulated as a result of inhibition of Delta24-reduction and 4alpha-demethylation. Progesterone, pregnenolone, and 17alpha-OH-pregnenolone were potent inhibitors of Delta24-reduction in an in vitro cell assay and led to the accumulation of desmosterol, a Delta5,24 sterol precursor of cholesterol. A markedly different effect was observed for 17alpha-OH-progesterone, which caused the accumulation of sterols associated with inhibition of 4alpha-demethylation. The flux of 13C-acetate into lathosterol and cholesterol was decreased by progestins as measured by isotopomer spectral analysis, whereas newly synthesized MAS accumulated. The combined evidence that MAS concentrations can be regulated by physiological levels of progestins and their specific combination provides a plausible explanation for the elevated concentration of MAS in gonads and suggests a new role for progestins in fertility.
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Affiliation(s)
- B Lindenthal
- Department of Physiology and Experimental Medicine, The George Washington University School of Medical and Health Sciences, Washington, DC 20037, USA.
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48
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Abstract
This study was carried out to examine the effects of the meiosis-activating C(29) sterol, 4,4-dimethyl-5 alpha-cholesta-8,14, 24-trien-3 beta-ol (FF-MAS), on mouse oocyte maturation in vitro. Cumulus cell-enclosed oocytes (CEO) and denuded oocytes (DO) from hormonally primed, immature mice were cultured 17-18 h in minimum essential medium (MEM) containing 4 mM hypoxanthine plus increasing concentrations of FF-MAS. The sterol induced maturation in DO with an optimal concentration of 3 microg/ml but was without effect in CEO, even at concentrations as high as 10 microg/ml. Some stimulation of maturation in hypoxanthine-arrested CEO was observed when MEM was replaced by MEMalpha. Interestingly, the sterol suppressed the maturation of hypoxanthine-arrested CEO in MEM upon removal of glucose from the medium. FF-MAS also failed to induce maturation in DO when meiotic arrest was maintained with dibutyryl cAMP (dbcAMP). The rate of maturation in FF-MAS-stimulated, hypoxanthine-arrested DO was slow, as more than 6 h of culture elapsed before significant meiotic induction was observed, and this response required the continued presence of the sterol. Although the oocyte took up radiolabeled lanosterol, such accumulation was restricted by the presence of cumulus cells. In addition, lanosterol failed to augment FSH-induced maturation and was even inhibitory at a high concentration. Moreover, the downstream metabolite, cholesterol, augmented the inhibitory action of dbcAMP on maturation in both CEO and DO. Two inhibitors of 14 alpha-demethylase, ketoconazole, and 14 alpha-ethyl-5 alpha-cholest-7-ene-3 beta, 15 alpha-diol that can suppress FF-MAS production from lanosterol failed to block consistently FSH-induced maturation. These results confirm the stimulatory action of FF-MAS on hypoxanthine-arrested DO but do not support a universal meiosis-inducing function for this sterol.
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Affiliation(s)
- S M Downs
- Biology Department, Marquette University, Milwaukee, Wisconsin 53233 Department of Biochemistry, Rice University, Houston, Texas 77005-1892, USA.
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49
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Ruan B, Tsai J, Wilson WK, Schroepfer GJ. Aberrant pathways in the late stages of cholesterol biosynthesis in the rat. Origin and metabolic fate of unsaturated sterols relevant to the Smith-Lemli-Opitz syndrome. J Lipid Res 2000; 41:1772-82. [PMID: 11060346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Minor aberrant pathways of cholesterol biosynthesis normally produce only trace levels of abnormal sterol metabolites but may assume major importance when an essential biosynthetic step is blocked. Cholesta-5,8-dien-3beta-ol, its Delta(5,7) isomer, and other noncholesterol sterols accumulate in subjects with the Smith-Lemli-Opitz syndrome (SLOS), a severe developmental disorder caused by a defective Delta(7) sterol reductase gene. We have explored the formation and metabolism of unsaturated sterols relevant to SLOS by incubating tritium-labeled Delta(5,8), Delta(6, 8), Delta(6,8(14)), Delta(5,8(14)), and Delta(8) sterols with rat liver preparations. More than 60 different incubations were carried out with washed microsomes or the 10,000 g supernatant under aerobic or anaerobic conditions; some experiments included addition of cofactors, fenpropimorph (a Delta(8);-Delta(7) isomerase inhibitor), and/or AY-9944 (a Delta(7) reductase inhibitor). The tritium-labeled metabolites from each incubation were identified by silver ion high performance liquid chromatography on the basis of their coelution with unlabeled authentic standards, as free sterols and/or acetate derivatives. The Delta(5,8) sterol was converted slowly to cholesterol via the Delta(5,7) sterol, which also slowly isomerized back to the Delta(5,8) sterol. The Delta(6,8) sterol was metabolized rapidly to cholesterol by an oxygen-requiring pathway via the Delta(7,9(11)), Delta(8), Delta(7), and Delta(5,7) sterols as well as by an oxygen-independent route involving initial isomerization to the Delta(5,7) sterol. The Delta(8) sterol was partially metabolized to Delta(5,8), Delta(6,8), Delta(7,9(11)), and Delta(5,7,9(11)) sterols when isomerization to Delta(7) was blocked.The combined results were used to formulate a scheme of normal and aberrant biosynthetic pathways that illuminate the origin and metabolic fate of abnormal sterols observed in SLOS and chondrodysplasia punctata.
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Affiliation(s)
- B Ruan
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA
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Ruan B, Wilson WK, Pang J, Schroepfer GJ. Synthesis of [3alpha-3H]cholesta-5,8-dien-3beta-ol and tritium-labeled forms of other sterols of potential importance in the Smith-Lemli-Optiz syndrome. Steroids 2000; 65:29-39. [PMID: 10624834 DOI: 10.1016/s0039-128x(99)00079-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Five unsaturated sterols relevant to the Smith-Lemli-Opitz syndrome have been prepared in high radiochemical purity with a tritium label at the 3alpha position. Swern oxidation of cholesta-5,8-dien-3beta-ol and other unlabeled C27 sterols afforded the corresponding 3-ketosteroids, and reduction with tritiated NaBH4 gave the desired 3alpha-3H sterols, with double bonds at the delta(5,8), delta(5,8(14)), delta(6,8), delta(6,8(14)), and delta8 positions. High radiochemical purity of the tritiated sterols was demonstrated by normal phase, reversed phase, and silver-ion (Ag+) high-performance liquid chromatography (HPLC). In the course of this work, we developed a medium-pressure variant of Ag+-HPLC for purifying radiolabeled samples, documented significant isotopic fractionation of the 3alpha-tritiated sterols and their acetates on Ag+-HPLC, and discovered unexpected effects of a delta(8(14)) bond on the conformation of 3-keto-delta5-steroids. The synthetic and analytical methodologies described herein should provide a sound basis for investigating the origin and metabolism of sterols involved in the Smith-Lemli-Opitz syndrome and in late stages of cholesterol biosynthesis.
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Affiliation(s)
- B Ruan
- Department of Chemistry, Rice University, Houston, TX 77005-1892, USA
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