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Jiao YR, Chen KX, Tang X, Tang YL, Yang HL, Yin YL, Li CJ. Exosomes derived from mesenchymal stem cells in diabetes and diabetic complications. Cell Death Dis 2024; 15:271. [PMID: 38632264 PMCID: PMC11024187 DOI: 10.1038/s41419-024-06659-w] [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: 10/31/2023] [Revised: 03/31/2024] [Accepted: 04/08/2024] [Indexed: 04/19/2024]
Abstract
Diabetes, a group of metabolic disorders, constitutes an important global health problem. Diabetes and its complications place a heavy financial strain on both patients and the global healthcare establishment. The lack of effective treatments contributes to this pessimistic situation and negative outlook. Exosomes released from mesenchymal stromal cells (MSCs) have emerged as the most likely new breakthrough and advancement in treating of diabetes and diabetes-associated complication due to its capacity of intercellular communication, modulating the local microenvironment, and regulating cellular processes. In the present review, we briefly outlined the properties of MSCs-derived exosomes, provided a thorough summary of their biological functions and potential uses in diabetes and its related complications.
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Affiliation(s)
- Yu-Rui Jiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Kai-Xuan Chen
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Xiang Tang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yu-Long Tang
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, 410125, China
| | - Hai-Lin Yang
- Department of Orthopaedics, The Second Affiliated Hospital of Fuyang Normal University, Fuyang, Anhui, 236000, China
| | - Yu-Long Yin
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan, 410125, China.
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, Hunan, 410128, China.
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
- Laboratory Animal Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
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Liu R, Jiao YR, Huang M, Zou NY, He C, Huang M, Chen KX, He WZ, Liu L, Sun YC, Xia ZY, Quarles LD, Yang HL, Wang WS, Xiao ZS, Luo XH, Li CJ. Mechanosensitive protein polycystin-1 promotes periosteal stem/progenitor cells osteochondral differentiation in fracture healing. Theranostics 2024; 14:2544-2559. [PMID: 38646641 PMCID: PMC11024844 DOI: 10.7150/thno.93269] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 03/28/2024] [Indexed: 04/23/2024] Open
Abstract
Background: Mechanical forces are indispensable for bone healing, disruption of which is recognized as a contributing cause to nonunion or delayed union. However, the underlying mechanism of mechanical regulation of fracture healing is elusive. Methods: We used the lineage-tracing mouse model, conditional knockout depletion mouse model, hindlimb unloading model and single-cell RNA sequencing to analyze the crucial roles of mechanosensitive protein polycystin-1 (PC1, Pkd1) promotes periosteal stem/progenitor cells (PSPCs) osteochondral differentiation in fracture healing. Results: Our results showed that cathepsin (Ctsk)-positive PSPCs are fracture-responsive and mechanosensitive and can differentiate into osteoblasts and chondrocytes during fracture repair. We found that polycystin-1 declines markedly in PSPCs with mechanical unloading while increasing in response to mechanical stimulus. Mice with conditional depletion of Pkd1 in Ctsk+ PSPCs show impaired osteochondrogenesis, reduced cortical bone formation, delayed fracture healing, and diminished responsiveness to mechanical unloading. Mechanistically, PC1 facilitates nuclear translocation of transcriptional coactivator TAZ via PC1 C-terminal tail cleavage, enhancing osteochondral differentiation potential of PSPCs. Pharmacological intervention of the PC1-TAZ axis and promotion of TAZ nuclear translocation using Zinc01442821 enhances fracture healing and alleviates delayed union or nonunion induced by mechanical unloading. Conclusion: Our study reveals that Ctsk+ PSPCs within the callus can sense mechanical forces through the PC1-TAZ axis, targeting which represents great therapeutic potential for delayed fracture union or nonunion.
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Affiliation(s)
- Ran Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yu-Rui Jiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Mei Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Nan-Yu Zou
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Chen He
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Min Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Kai-Xuan Chen
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Wen-Zhen He
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Ling Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yu-Chen Sun
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Zhu-Ying Xia
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - L. Darryl Quarles
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Hai-Lin Yang
- Department of Orthopaedics, The Second Affiliated Hospital of Fuyang Normal University, Fuyang, Anhui, 236000, China
| | - Wei-Shan Wang
- Department of Orthopaedics, The First Affiliated Hospital of Shihezi University, Shihezi 832061, China
| | - Zhou-Sheng Xiao
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Xiang-Hang Luo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Laboratory Animal Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
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Zhang Y, Wang ZQ, Deng SJ, Chen KX, Sun XG. [Clinical analysis of corneal interface infection]. Zhonghua Yan Ke Za Zhi 2023; 59:657-663. [PMID: 37550974 DOI: 10.3760/cma.j.cn112142-20221029-00549] [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] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Objective: To analyze the clinical features of corneal interface infection. Methods: A retrospective case series study was conducted to explore the clinical features of interstitial corneal infection. The data of eight patients (eight eyes) who were diagnosed with interstitial corneal infection after undergoing corneal transplant or corneal refractive surgery and visited Beijing Tongren Eye Center from January to December 2018 were collected, including two male and six female patients aged between 18 and 55 years (median age, 27 years). The patients' general information, surgical type, onset time, and clinical manifestations were recorded. The lesions were examined by in vivo corneal laser confocal microscopy (IVCM), and microbial cultures and drug sensitivity tests were performed. Results: Among the 8 patients, 4 had undergone small-incision lenticule extraction (SMILE), 2 had undergone lamellar keratoplasty, and 2 had undergone endothelial keratoplasty. The onset of infection occurred between 2 and 30 days after surgery, with a mean of 9.8 days. Among the 3 patients who had undergone SMILE, the treatment outcome was corneal haze or opacity, while the remaining 5 cases required corneal transplantation for interstitial infections. The pathogens of the 4 cases of interstitial infection after corneal transplantation were all Candida species. Under the IVCM, patients with corneal interstitial bacterial infections showed a large amount of necrotic tissue with no normal tissue structure in the corneal stroma, with infiltration of inflammatory cells and local aggregation of inflammatory cells, but no typical pathogen was observed. Patients with fungal infections showed fungal hyphae under the corneal cap (filamentous fungal infection) or dense, punctate, high-reflection structures in the corneal interstitial space (yeast-like fungal infection). Conclusions: Corneal interlayer infection is difficult to diagnose early and has a poor prognosis. IVCM can assist in early diagnosis. The pathogen spectrum of corneal interlayer infection may differ from that of corneal infection caused by trauma.
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Affiliation(s)
- Y Zhang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Z Q Wang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - S J Deng
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - K X Chen
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - X G Sun
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
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4
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Guo XY, Wang ZQ, Chen KX, Zhang Y, Wei ZY, Liang QF. [Analysis of clinical manifestations and imaging characteristics of in vivo confocal microscopy for Nocardia keratitis]. Zhonghua Yan Ke Za Zhi 2023; 59:279-287. [PMID: 37012591 DOI: 10.3760/cma.j.cn112142-20221001-00480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Objective: To analyze the clinical manifestations and imaging characteristics of in vivo confocal microscopy (IVCM) for Nocardia keratitis. Methods: It was a retrospective case series study. Medical records of 16 consecutive patients (16 eyes) with Nocardia keratitis were collected from the Department of Ophthalmology at Beijing Tongren Hospital, Capital Medical University between 2018 and 2022. The group consisted of 11 males and 5 females. The inclusion criteria for the study were the presence of typical clinical manifestations of Nocardia keratitis and at least one positive pathogenic test (corneal scraping or microbial culture) indicating Nocardia infection. The medical history, clinical and microbiological examination data of the patients were analyzed, including risk factors, diagnosis time, clinical manifestations, diagnostic methods, strain isolation, cure time, and best corrected visual acuity before and after treatment. This study utilized techniques such as slit lamp microscopy, in vivo confocal microscopy (IVCM), scraping cytology, microbial culture, and mass spectrometry identification. Results: The main risk factors for Nocardia keratitis included plant or foreign body injuries (5 out of 16 cases), contact lens use (4 out of 16 cases), and surgery (2 out of 16 cases). The average time to diagnosis was (20.8±11.8) days, with the shortest time being 8 days and the longest being 60 days. The best corrected visual acuity was less than 0.05 in 7 patients, between 0.05 to 0.3 in 7 patients, and greater than or equal to 0.3 in 2 patients. The typical symptoms included superficial gray-white infiltration in a wreath-like pattern on the cornea, corneal ulcers with dry and gray-white necrotic tissue coverage, and in severe cases, corneal ulcer perforation. Nocardia corneal infection was identified in 12 out of 16 cases by scraping cytology, 9 out of 16 cases by mass spectrometry, and 8 out of 16 cases by both methods. IVCM showed the presence of fine and moderately reflective filamentous hyphae in the subepithelial and superficial stromal layer of the cornea, arranged in elongated, beaded, and branched structures. Infiltration of many hyper-reflective round inflammatory cells was also seen around the hyphae. Fourteen cases were treated with medication and 2 cases were treated with corneal transplantation. The average cure time was (37.5±25.2) days and there were no cases of recurrence during the follow-up period (all greater than 6 months). Conclusions: Nocardia keratitis is primarily characterized by dense, round, or wreath-like infiltration in the early stage, and by gray-white dry necrotic secretion and hypopyon on the surface of corneal ulcers in the middle and late stages. Fine, branched or beaded, and moderately reflective filamentous structures are the hallmark of the corneal lesion on the IVCM images.
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Affiliation(s)
- X Y Guo
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Z Q Wang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - K X Chen
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Y Zhang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Z Y Wei
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
| | - Q F Liang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology & Visual Sciences, Beijing 100730, China
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He WZ, Yang M, Jiang Y, He C, Sun YC, Liu L, Huang M, Jiao YR, Chen KX, Hou J, Huang M, Xu YL, Feng X, Liu Y, Guo Q, Peng H, Huang Y, Su T, Xiao Y, Li Y, Zeng C, Lei G, Luo XH, Li CJ. miR-188-3p targets skeletal endothelium coupling of angiogenesis and osteogenesis during ageing. Cell Death Dis 2022; 13:494. [PMID: 35610206 PMCID: PMC9130327 DOI: 10.1038/s41419-022-04902-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 04/26/2022] [Accepted: 04/29/2022] [Indexed: 12/14/2022]
Abstract
A specific bone capillary subtype, namely type H vessels, with high expression of CD31 and endomucin, was shown to couple angiogenesis and osteogenesis recently. The number of type H vessels in bone tissue declines with age, and the underlying mechanism for this reduction is unclear. Here, we report that microRNA-188-3p (miR-188-3p) involves this process. miRNA-188-3p expression is upregulated in skeletal endothelium and negatively regulates the formation of type H vessels during ageing. Mice with depletion of miR-188 showed an alleviated age-related decline in type H vessels. In contrast, endothelial-specific overexpression of miR-188-3p reduced the number of type H vessels, leading to decreased bone mass and delayed bone regeneration. Mechanistically, we found that miR-188 inhibits type H vessel formation by directly targeting integrin β3 in endothelial cells. Our findings indicate that miR-188-3p is a key regulator of type H vessel formation and may be a potential therapeutic target for preventing bone loss and accelerating bone regeneration.
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Affiliation(s)
- Wen-Zhen He
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Mi Yang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yangzi Jiang
- Institute for Tissue Engineering and Regenerative Medicine (iTERM), School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Chen He
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yu-Chen Sun
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Ling Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Mei Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yu-Rui Jiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Kai-Xuan Chen
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Jing Hou
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Min Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yi-Li Xu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Xu Feng
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Ya Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Qi Guo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Hui Peng
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yan Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Tian Su
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Ye Xiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
| | - Yusheng Li
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Chao Zeng
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Guanghua Lei
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, 410008, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Xiang-Hang Luo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, 410008, Hunan, China
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, 410008, Hunan, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
- Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, 410008, Hunan, China.
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Jiang HY, Jiang ND, Wang L, Guo JJ, Chen KX, Dai YJ. Characterization of nitrilases from Variovorax boronicumulans that functions in insecticide flonicamid degradation and β-cyano-L-alanine detoxification. J Appl Microbiol 2022; 133:311-322. [PMID: 35365856 DOI: 10.1111/jam.15561] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 03/04/2022] [Accepted: 03/28/2022] [Indexed: 11/27/2022]
Abstract
AIMS To characterize the functions of nitrilases of Variovorax boronicumulans CGMCC 4969 and evaluate flonicamid (FLO) degradation and β-cyano-L-alanine (Ala(CN)) detoxification by this bacterium. METHODS AND RESULTS V. boronicumulans CGMCC 4969 nitrilases (NitA and NitB) were purified and substrate specificity assay indicated that both of them degraded insecticide FLO to N-(4-trifluoromethylnicotinoyl)glycinamide (TFNG-AM) and 4-(trifluoromethyl)nicotinol glycine (TFNG). Ala(CN), a plant detoxification intermediate, was hydrolyzed by NitB. Escherichia coli overexpressing NitA and NitB degraded 41.2 and 93.8% of FLO (0.87 mmol·L-1 ) within 1 h, with half-lives of 1.30 and 0.25 h, respectively. NitB exhibited the highest nitrilase activity toward FLO. FLO was used as a substrate to compare their enzymatic properties. NitB was more tolerant to acidic conditions and organic solvents than NitA. Conversely, NitA was more tolerant to metal ions than NitB. CGMCC 4969 facilitated FLO degradation in soil and surface water and utilized Ala(CN) as a sole nitrogen source for growth. CONCLUSIONS CGMCC 4969 efficiently degraded FLO mediated by NitA and NitB; NitB was involved in Ala(CN) detoxification. SIGNIFICANCE AND IMPACT OF THE STUDY This study promotes our understanding of versatile functions of nitrilases from CGMCC 4969 that is promising for environmental remediation.
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Affiliation(s)
- H Y Jiang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing, People's Republic of China
| | - N D Jiang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing, People's Republic of China
| | - L Wang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing, People's Republic of China
| | - J J Guo
- Nanjing Normal University Zhongbei College, Zhenjiang, People's Republic of China
| | - K X Chen
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing, People's Republic of China
| | - Y J Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing, People's Republic of China
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Li CJ, Xiao Y, Sun YC, He WZ, Liu L, Huang M, He C, Huang M, Chen KX, Hou J, Feng X, Su T, Guo Q, Huang Y, Peng H, Yang M, Liu GH, Luo XH. Senescent immune cells release grancalcin to promote skeletal aging. Cell Metab 2022; 34:184-185. [PMID: 34986333 DOI: 10.1016/j.cmet.2021.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Zhang Y, Lyu ZY, Yang L, Wang SF, Zhang LW, Sheng C, Wang ZP, Zhang YC, Wang H, Huang YB, Chen KX. [Potential pleiotropism of cancer-related single nucleotide polymorphisms among Chinese population]. Zhonghua Yu Fang Yi Xue Za Zhi 2021; 55:1203-1208. [PMID: 34706505 DOI: 10.3760/cma.j.cn112150-20201121-01390] [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 investigate the potential pleiotropism of cancer-related single nucleotide polymorphisms (SNPs) among Chinese population. Methods: Based on the catalogue of GWAS jointly constructed by the National Human Genome Research Institute and the European Institute of Bioinformatics, according to population origin (Chinese population and non-Chinese population) and disease traits (cancer and non-cancer traits). All SNPs found by GWAS before August 2020 were divided into four categories: cancer in Chinese population, non-cancer in Chinese population, cancer in non-Chinese population and non-cancer in non-Chinese population. The number, correlation and linkage of the four categories of SNPs were described. Results: By August 2020, a total of 196 813 SNPs from 4 096 GWAS were included in the GWAS directory. The information that SNPs refer to unknown or were not related to the disease was excluded, and 117 441 independent SNPs were finally included. There were 619 SNPs related to cancer and 9 569 SNPs related to non-cancer disease in Chinese population, respectively. There were 4 624 SNPs related to cancer and 106 448 SNPs related to non-cancer disease (trait) in non-Chinese population, respectively. Three SNPs, rs2736100, rs6983267 and rs401681, were associated with two or more types of cancer in both Chinese and non-Chinese populations. Seven SNPs, rs7705526, rs2736100, rs10993994, rs2735839, rs4430796, rs174537 and rs9271588, were associated with cancer and non-cancer diseases in both Chinese and non-Chinese populations, respectively. Conclusion: There is a potential pleiotropism of cancer-related SNPs in Chinese population.
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Affiliation(s)
- Y Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Z Y Lyu
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - L Yang
- Beijing Office for Cancer Prevention and Control, Peking University Cancer Hospital & Institute, Beijing 100142, China
| | - S F Wang
- Department of Epidemiology & Bio-statistics, School of Public Health, Peking University Health Science Center, Beijing 100191, China
| | - L W Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - C Sheng
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Z P Wang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Y C Zhang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - H Wang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Y B Huang
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - K X Chen
- Department of Cancer Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
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Luo ZY, Wang D, Chen KX, Huang L, Liu X, Zhang Q, Zhu H, Zhu S. Metal Oxy-Hydroxides with a Hierarchical and Hollow Structure for Highly Efficient Solar-Thermal Water Evaporation. ACS Appl Mater Interfaces 2021; 13:27726-27733. [PMID: 34085527 DOI: 10.1021/acsami.1c09398] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Solar-thermal water evaporation is a promising technology for pure water production. However, the design of low-cost systems for efficient antifouling solar-thermal water evaporation remains a challenge. Herein, an evaporator based on metal oxy-hydroxides with a hierarchical and hollow structure is rationally designed through material selection and structural engineering. The obtained evaporator possesses good light absorption performance, excellent antifouling property against oil, and enhanced heat localization ability. Consequently, the water evaporation rate reaches as high as 1.65 kg m-2 h-1 with a solar-thermal conversion efficiency up to 82.3% under 1 sun illumination. More importantly, the evaporator exhibits almost identical evaporation performance in oily wastewater and natural seawater due to its superhydrophilicity and underwater superoleophobicity. This work provides a worth-adopted approach to prepare solar-thermal evaporators with high efficiency and anti-oil-fouling property, highlighting the new application of metal oxy-hydroxide-based materials and the importance of a hierarchical and hollow structure for efficient solar-thermal water evaporation.
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Affiliation(s)
- Zhi-Yong Luo
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
- University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
| | - Dong Wang
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
| | - Kai-Xuan Chen
- Chair of Solid-State and Quantum Chemistry, Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Lingqi Huang
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
- University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
| | - Xiangyang Liu
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
| | - Qi Zhang
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
| | - He Zhu
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
| | - Shiping Zhu
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong 518172, P.R. China
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Xie CH, Gao XX, Meng XL, Chen KX, Zhang XH, Zhou X, Yu JA. [Effect analysis of sequential laser application in treating the hypertrophic scars of burn children at early stage]. Zhonghua Shao Shang Za Zhi 2021; 37:327-332. [PMID: 33874703 DOI: 10.3760/cma.j.cn501120-20201214-00526] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the effects of sequential application of intensive pulsed light and carbon dioxide laser in treating the hypertrophic scars of burn children at early stage. Methods: A retrospective cohort before-after control study in the same patients was conducted. From January 2016 to December 2018, 145 burn children with hypertrophic scar at the early stage who met the inclusion criteria were admitted to the First Hospital of Jilin University, including 82 males and 63 females, aged 1 to 12 (3 (2, 6)) years. All the children were firstly treated with intense pulsed light therapy (no anesthesia or intravenous-inhalation combined anesthesia) at an interval of once per month, and then changed to carbon dioxide laser therapy (topical anesthesia or intravenous-inhalation combined anesthesia) when the degree of scar hyperemia was reduced, at an interval of once every 3 months, for a total of 3 times. Before the first intense pulsed light treatment (hereinafter referred to as before the first treatment) and 3 months after the last carbon dioxide laser treatment (hereinafter referred to as after the last treatment), scar scoring was evaluated by Vancouver Scar Scale (VSS), and scar hyperemia (denoted as hemoglobin level) was measured with Antera 3D® camera. The times of intense pulsed light, the time of single treatment, the anesthesia method, and the time of intravenous-inhalation combined anesthesia of intense pulsed light and carbon dioxide laser treatment were analyzed. After the last treatment, Likert Scale was used to evaluate the efficacy satisfaction of both doctors and patients. Adverse reactions were recorded during the treatment. Data were statistically analyzed with Wilcoxon signed rank sum test, and paired sample t test. Results: The color, vascular distribution, thickness, and softness scores, and total score in VSS scoring of scars of children after the last treatment were significantly lower than those before the first treatment (Z=-6.05, -10.34, -9.84, -9.28, -10.43, P<0.01). The hemoglobin level of scar of children after the last treatment was 1.86±0.24, significantly lower than 2.27±0.32 before the first treatment (t=17.65, P<0.01). A total of 411 times of intense pulsed light therapy were performed, (2.8±0.6) times per person, and the single treatment time was 35 (20, 45) s. There were 392 times (95.38%) without anesthesia, and 19 times (4.62%) with intravenous-inhalation combined anesthesia with time of 6 (5, 8) min. The single treatment time of carbon dioxide laser therapy was 5 (3, 10) min. There were 364 times (83.68%) of topical anesthesia and 71 times (16.32%) of intravenous-inhalation combined anesthesia with time of 10 (8, 15) min. After the last treatment, the efficacy satisfaction scores of doctors and patients were (4.3±0.7) and (3.8±1.0) points, respectively. Blisters occurred in 5 cases after intense pulsed light treatment, which were healed naturally after drainage. One child developed local skin infection, skin redness and swelling accompanied by purulent exudate after carbon dioxide laser treatment, which was improved after skin disinfection and external use of mupirocin ointment. No inflammatory pigmentation, worsening of hyperplasia of scar, erythema, or other skin adverse reactions or anesthetics-related adverse reactions occurred in any child. Conclusions: Sequential application of intense pulsed light and carbon dioxide laser to treat the hypertrophic scars of burn children at early stage can obviously improve the appearance and texture of scar, with higher satisfaction of doctors and patients and fewer adverse reactions.
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Affiliation(s)
- C H Xie
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - X X Gao
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - X L Meng
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - K X Chen
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - X H Zhang
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - X Zhou
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
| | - J A Yu
- Department of Burn Surgery, the First Hospital of Jilin University, Changchun 130061, China
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Zhang Y, Chen K, Li Y, Lan J, Yan B, Shi L, Ran R. High-Strength, Self-Healable, Temperature-Sensitive, MXene-Containing Composite Hydrogel as a Smart Compression Sensor. ACS Appl Mater Interfaces 2019; 11:47350-47357. [PMID: 31746192 DOI: 10.1021/acsami.9b16078] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As a new two-dimensional material similar to graphene, MXene has attracted extensive attention in the field of electrochemical materials such as supercapacitors because of its excellent mechanical properties, electrical conductivity, and thermal conductivity. What is better than graphene is that the few-layer MXene material obtained by proper treatment has good water dispersibility and can be used as an ideal nanomaterial to enhance the conductivity of hydrogels. However, the articles about the few-layer MXene material used in the preparation of composite hydrogels are rare. In this paper, MXene was synthesized by Yury mild method. Poly(N-isopropyl acrylamide) (PNIPAM) hydrogel and physical cross-linking hydrogel were used as the matrix to prepare composite hydrogels with temperature sensitivity and stress-sensing properties. The composite hydrogels exhibited excellent mechanical properties: it could be stretched to over 14 times the original length and achieved a 0.4 MPa tensile strength while showing good self-healing ability, which was of great significance for the practical application of hydrogels. The conductivity of the composite hydrogel was 1.092 S/m, which was about 15 times that of the control hydrogel without MXene. The potential of the composite hydrogel as a smart compression sensor was also verified by the conductivity tests.
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Affiliation(s)
- Yulin Zhang
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - KaiXuan Chen
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - Yueshan Li
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - Ji Lan
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - Bin Yan
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - Lingying Shi
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
| | - Rong Ran
- College of Polymer Science and Engineering , Sichuan University , Chengdu 610065 , China
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Li XC, Wang MY, Yang M, Dai HJ, Zhang BF, Wang W, Chu XL, Wang X, Zheng H, Niu RF, Zhang W, Chen KX. A mutational signature associated with alcohol consumption and prognostically significantly mutated driver genes in esophageal squamous cell carcinoma. Ann Oncol 2019; 29:938-944. [PMID: 29351612 DOI: 10.1093/annonc/mdy011] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Background Esophageal squamous cell carcinoma (ESCC) is often diagnosed at an advanced and incurable stage. Information on driver genes and prognosticators in ESCC remains incomplete. The objective was to elucidate significantly mutated genes (SMGs), mutational signatures, and prognosticators in ESCC. Patients and methods Three MutSig algorithms (i.e. MutSigCV, MutSigCL and MutSigFN) and '20/20+' ratio-metric were employed to identify SMGs. Nonnegative matrix factorization was used to decipher mutational signatures. Kaplan-Meier survival analysis, multivariate Cox and logistic regression models were applied to analyze association between mutational features and clinical parameters. Results We identified 26 SMGs, including 8 novel (NAV3, TENM3, PTCH1, TGFBR2, RIPK4, PBRM1, USP8 and BAP1) and 18 that have been previously reported. Three mutational signatures were identified to be prevalent in ESCC including clocklike C>T at CpG, APOBEC overactive C>T at TpCp[A/T], and a signature featured by T>C substitution. The T>C mutational signature was significantly correlated with alcohol consumption (OR: 3.59; 95% CI: 2.30-5.67; P < 0.001). This alcohol consumption signature was also observed in liver cancer and head and neck squamous cell carcinoma, and its mutational activity was substantially higher in samples with mutations in TP53. Survival analysis revealed that TENM3 mutations (HR: 5.54; CI: 2.68-11.45; P < 0.001) and TP53 hotspot mutation p.R213* (HR: 3.37; CI: 1.73-8.06; P < 0.001) were significantly associated with shortened survival outcome. The association remained statistically significant after controlling for age, gender, TNM stage and tumor grade. Conclusions We have uncovered several new SMGs in ESCC and defined an alcohol consumption related mutational signature. TENM3 mutations and the TP53 hotspot mutation p.R213* are independent prognosticators for poor survival in ESCC.
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Affiliation(s)
- X C Li
- Public Laborato, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - M Y Wang
- Beijing Genomics Institute-Shenzhen, Shenzhen, Guangdong, China
| | - M Yang
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China; Wake Forest Baptist Comprehensive Cancer Center, Wake Forest Baptist Medical Center, Winston-Salem, USA; Department of Cancer Biology, Wake Forest School of Medicine, Winston-Salem, USA
| | - H J Dai
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - B F Zhang
- Beijing Genomics Institute-Shenzhen, Shenzhen, Guangdong, China
| | - W Wang
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - X L Chu
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - X Wang
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - H Zheng
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - R F Niu
- Public Laborato, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - W Zhang
- Wake Forest Baptist Comprehensive Cancer Center, Wake Forest Baptist Medical Center, Winston-Salem, USA; Department of Cancer Biology, Wake Forest School of Medicine, Winston-Salem, USA.
| | - K X Chen
- Department of Epidemiology and Biostatisti, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China.
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Li MS, Chen KX, Mo DC, Lyu SS. Predicted high thermoelectric performance in a two-dimensional indium telluride monolayer and its dependence on strain. Phys Chem Chem Phys 2019; 21:24695-24701. [DOI: 10.1039/c9cp04666f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Group IIIA–VIA monolayers are predicted to exhibit high thermoelectric performance, owing to their low thermal conductance and unique band structures.
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Affiliation(s)
- Min-Shan Li
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou
- P. R. China
- Guangdong Engineering Technology Research Centre for Advanced Thermal Control Material and System Integration (ATCMSI)
| | - Kai-Xuan Chen
- Guangdong Engineering Technology Research Centre for Advanced Thermal Control Material and System Integration (ATCMSI)
- Sun Yat-sen University
- Guangzhou
- P. R. China
- Chair of Solid-State and Quantum Chemistry
| | - Dong-Chuan Mo
- Guangdong Engineering Technology Research Centre for Advanced Thermal Control Material and System Integration (ATCMSI)
- Sun Yat-sen University
- Guangzhou
- P. R. China
- School of Materials
| | - Shu-Shen Lyu
- Guangdong Engineering Technology Research Centre for Advanced Thermal Control Material and System Integration (ATCMSI)
- Sun Yat-sen University
- Guangzhou
- P. R. China
- School of Materials
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Yao GD, Niu YY, Chen KX, Meng HX, Yao GD, Song HT, Tian ZN, Geng JS, Feng MY. SOX2 gene expression and its role in triple negative breast cancer tissues. J BIOL REG HOMEOS AG 2018; 32:1399-1406. [PMID: 30574744] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aim of this work was to study the expression of SOX2 gene in triple negative breast cancer and its role. One hundred and twenty specimens of paraffin-embedded triple negative breast cancer (TNBC) tissues were collected from Harbin Medical University Cancer Hospital, Heilongjiang, China between January 2014 and March 2018. The expression of SOX2 was detected using immunohistochemistry, and the relationship between the expression of SOX2 and clinical features was analyzed. Breast cancer cell lines (normal group, SOX2 interference group, SOX2 overexpression group) were cultured in vitro to detect the proliferation and cloning ability of the cell lines. The expression of SOX2 was related to lymph node metastasis and stage of breast cancer (P less than 0.05), but was not related to age, menopause or tumor size (P > 0.05); the expression of SOX2 in the overexpression group was significantly greater than that in the normal group after 72 hours, and no significant difference between the overexpression group and the interference group was observed. The number of clone cells with a diameter of 0.5 mm in the interference group was lower compared to the normal group, and that of the overexpression group was higher, but not significant. SOX2 is associated with the high invasiveness of breast cancer and can be used as a therapeutic target to inhibit the metastasis of cancer cells. SOX2 can promote the proliferation of breast cancer cells and affect the size of clone cells in its involvement in clone.
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Affiliation(s)
- G D Yao
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - Y Y Niu
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - K X Chen
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - H X Meng
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - G D Yao
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - H T Song
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - Z N Tian
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - J S Geng
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
| | - M Y Feng
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang Province, China
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15
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Goldman-Yassen AE, Chen KX, Edasery D, Hsu K, Ye K, Lipton ML. Near-Term Decrease in Brain Volume following Mild Traumatic Injury Is Detectible in the Context of Preinjury Volumetric Stability: Neurobiologic Insights from Analysis of Historical Imaging Examinations. AJNR Am J Neuroradiol 2018; 39:1821-1826. [PMID: 30190258 DOI: 10.3174/ajnr.a5769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/29/2018] [Indexed: 12/29/2022]
Abstract
BACKGROUND AND PURPOSE Neurodegeneration after mild traumatic brain injury may manifest as decreasing regional brain volume that evolves from months to years following mild traumatic brain injury and is associated with worse clinical outcomes. We hypothesized that quantitative brain volume derived from CT of the head, performed for clinical indications during routine care, would change with time and provide insights into the putative neuroinflammatory response to mild traumatic brain injury. MATERIALS AND METHODS We searched the electronic medical record of our institution for NCCTs of the head performed in patients with mild traumatic brain injury and included those who also underwent NCCTs of the head 1 month to 1 year before and after mild traumatic brain injury for an indication unrelated to trauma. Controls underwent 3 sequential NCCTs of the head with indications unrelated to trauma. The whole-brain and intracranial volume groups were computed using ITK-SNAP. Brain volumes normalized to intracranial volumes were compared across time points using the Wilcoxon signed-rank test. RESULTS We identified 48 patients from 2005 to 2015 who underwent NCCTs of the head in the emergency department for mild traumatic brain injury and had NCCTs of the head performed both before and after mild traumatic brain injury. Median normalized brain volumes significantly decreased on the follow-up study post-mild traumatic brain injury (0.86 versus 0.84, P < .001) and were similar compared with pre-mild traumatic brain injury studies (0.87 versus 0.86, P = .927). There was no significant difference between normalized brain volumes in the 48 controls. CONCLUSIONS A decrease in brain volume following mild traumatic brain injury is detectable on CT and is not seen in similar patients with non-mild traumatic brain injury during a similar timeframe. Given the stability of brain volume before mild traumatic brain injury, CT volume loss may represent the subtle effects of neurodegeneration.
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Affiliation(s)
- A E Goldman-Yassen
- From the Department of Radiology (A.E.G.-Y., K.X.C., D.E., K.H.), Montefiore Medical Center, Bronx, New York
| | - K X Chen
- From the Department of Radiology (A.E.G.-Y., K.X.C., D.E., K.H.), Montefiore Medical Center, Bronx, New York
| | - D Edasery
- From the Department of Radiology (A.E.G.-Y., K.X.C., D.E., K.H.), Montefiore Medical Center, Bronx, New York
| | - K Hsu
- From the Department of Radiology (A.E.G.-Y., K.X.C., D.E., K.H.), Montefiore Medical Center, Bronx, New York
| | - K Ye
- Department of Epidemiology and Population Health (K.Y.), Albert Einstein College of Medicine, Bronx, New York
| | - M L Lipton
- Gruss Magnetic Resonance Research Center Departments of Radiology, Psychiatry and Behavioral Sciences and Dominick P. Purpura Department of Neuroscience (M.L.L.), Albert Einstein College of Medicine, Bronx, New York.
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Chen KX, Lyu SS, Luo ZY, Fu YX, Heng Y, Mo DC. Theoretical design of a new family of two-dimensional topological insulators. Phys Chem Chem Phys 2017; 19:7481-7485. [DOI: 10.1039/c6cp08670e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of two-dimensional topological insulators, hydrogenated monolayer of Pb2XY (X = Ga/In and Y = Sb/Bi), has been predicted in our study.
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Affiliation(s)
- Kai-Xuan Chen
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Shu-Shen Lyu
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Zhi-Yong Luo
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Yuan-Xiang Fu
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Yi Heng
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Dong-Chuan Mo
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
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17
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Abstract
Armchair WSe2 nanoribbon structures are predicted to exhibit outstanding thermoelectric performance, mainly attributed to the ribbon edge disorder.
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Affiliation(s)
- Kai-Xuan Chen
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Zhi-Yong Luo
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Dong-Chuan Mo
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Shu-Shen Lyu
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Guangzhou 510275
- China
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Xi ZW, Xin SY, Zhou LQ, Yuan HX, Wang Q, Chen KX. Downregulation of rho-associated protein kinase 1 by miR-124 in colorectal cancer. World J Gastroenterol 2015; 21:5454-5464. [PMID: 25987767 PMCID: PMC4427666 DOI: 10.3748/wjg.v21.i18.5454] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/21/2015] [Accepted: 02/11/2015] [Indexed: 02/07/2023] Open
Abstract
AIM: To investigate the roles and interactions of rho-associated protein kinase (ROCK)1 and miR-124 in human colorectal cancer (CRC).
METHODS: Expression of ROCK1 protein was examined by Western blotting, and quantitative reverse transcriptase PCR was performed to measure expression of ROCK1 mRNA and miR-124. Two cancer cell lines were transfected with pre-miR-124 (mimic) and anti-miR-124 (inhibitor) and the effects on ROCK1 protein and mRNA expression were observed. In addition, cell proliferation was assessed via a 5-ethynyl-2′ deoxyuridine assay. Soft agar formation assay, and cell migration and invasion assays were used to determine the effect of survivin on the transformation and invasion activity of CRC cells.
RESULTS: miR-124 was significantly downregulated in CRC compared to normal specimens (0.603 ± 0.092 vs 1.147 ± 0.286, P = 0.016) and in metastatic compared to nonmetastatic CRC specimens (0.416 ± 0.047 vs 0.696 ± 0.089, P = 0.020). Expression of miR-124 was significantly associated with CRC metastasis, tumor T and N stages, and tumor grade (all P < 0.05). ROCK1 protein was significantly increased in CRC compared to normal tissues (1.896 ± 0.258 vs 0.866 ± 0.136, P = 0.026), whereas ROCK1 mRNA expression was unaltered (2.613 ± 0.251 vs 2.325 ± 0.246). miR-124 and ROCK1 were inversely expressed in CRC tissues and cell lines. ROCK1 mRNA was unaltered in cells transfected with miR-124 mimic and miR-124 inhibitor, compared to normal controls. There was a significant reduction in ROCK1 protein in cells transfected with miR-124 mimic and a significant increase in cells transfected with miR-124 inhibitor (Ps < 0.05). Transformation and invasion of cells transfected with miR-124 inhibitor were significantly increased compared to those in normal controls (P < 0.05). Cells transfected with miR-124 inhibitor showed increased cell proliferation.
CONCLUSION: miR-124 promotes hyperplasia and contributes to invasion of CRC cells, but downregulates ROCK1. ROCK1 and miR-124 may play important roles in CRC.
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Hao XS, Wang PP, Chen KX, Li Q, He M, Yu SB, Guo ZY, Perruccio A, Rohan T. Twenty-year trends of primary liver cancer incidence rates in an urban Chinese population. Eur J Cancer Prev 2003; 12:273-9. [PMID: 12883379 DOI: 10.1097/00008469-200308000-00006] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [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: 10/27/2022]
Abstract
The objective of this study was to describe trends in the incidence rates of primary liver cancer in a geographically defined Chinese population. Primary liver cancer cases (N=13 685) were diagnosed between 1981 and 2000 and identified by the Tianjin Cancer Registry. Age-adjusted and age-specific incidence rates were examined in both males and females. Poisson regression was employed to assess the incidence rate trends. Crude and age-adjusted incidence rates in the study period were: 27.4/100 000 and 16.4/100 000 in males and 11.5/100 000 and 6.4/100 000 in females, respectively. While the results from Poisson regression analyses suggest statistically significant trends of declining incidence rates of primary liver cancer overall, trends were not consistent across age and sex groups. The decline in incidence was observed, for the most part, in the 40-69 age group, with a greater decrease in males. Our findings provide a new evidence of a downward trend in incidence rates of this disease in China for a period of 20 years. As the observed decline is relatively small and inconsistent across sex and age groups, a continued epidemiological observation on this condition is required.
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Affiliation(s)
- X S Hao
- Tianjin Cancer Institute and Hospital, Tianjin Medical University, Tianjin China
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Yang YS, Zhao SR, Ji RY, Chen KX. [Recent development in quinolone compounds antitumor quinolones]. Yao Xue Xue Bao 2002; 33:157-60. [PMID: 11938953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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Huang XQ, Jiang HL, Luo XM, Shen JK, Chen KX, Ji RY, Cao Y, Xue H. A 3D structural model of memapsin 2 protease generated from theoretical study. Acta Pharmacol Sin 2001; 22:50-6. [PMID: 11730562] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
AIM To build a 3D structural model of memapsin 2 (M2) protease for theoretical study and drug design. METHODS Structural alignment was performed based on multiple and pairwise sequence alignment of three templates. After the initial model was generated, energy minimization was completed by applying molecular mechanics method. Molecular dynamics (MD) technique was used to do further structural optimization. RESULTS The 3D structural model of memapsin 2 was constructed. The model is reasonable according to several validation criteria. The active-site motifs of M2 are structurally supported by a beta-sheet rich domain and linked together with this domain through alpha helices. Tyr132 contained in beta-hairpin is a general characteristic of aspartic protease. The Calpha atom superimposing result is a direct verification that M2 is structurally unique but still belongs to the aspartic protease superfamily. CONCLUSION The 3D-structure model from our study is informative to guide future molecular biology study about M2 and drug design based on database searching.
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Affiliation(s)
- X Q Huang
- Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
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22
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Wan XH, Huang XQ, Zhou DH, Jiang HL, Chen KX, Chi ZQ. Building 3D-structural model of kappa opioid receptor and studying its interaction mechanism with dynorphin A(1-8). Acta Pharmacol Sin 2000; 21:701-8. [PMID: 11501178] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
AIM To construct the 3D-structural model of human kappa opioid receptor (HKOR) and study its interacting mechanism with dynorphin A(1-8) (Dyn8). METHODS Comparative molecular modeling was applied to build the 7 transmembrane (TM) helical domain of HKOR using the bovine rhodopsin (OPSD) model as a template. Molecular dynamics was performed to minimize the HKOR model and to simulate the 3D-structure of Dyn8 based on the NMR results of dynorphin A(1-14). The extracellular loops (EL) were built by self-constructed database searching. DOCK4.0 program was performed to construct Dyn8 complex with HKOR. RESULTS (1) The model of HKOR was obtained and validated by theoretical and experimental data. (2) The Dyn8-HKOR interacting mechanism is reasonably explained: Side chain of residue Asp138 interacts with protonated nitrogen atom at the N-terminal residues of Dyn8 through electrostatic and hydrogen bonding, which play an important role in ligand binding with receptor. (3) Negatively charged amino acids in the second extracellular loop (EL2) as Asp223 and Glu209 interact with the C-terminal positively charged residues in Dyn8, and Glu209 is a likely determinant of peptide ligand specificity. CONCLUSION Some amino acid residues positioned in EL2, TM3, TM4, and TM5 form the binding site and therefore determine the selectivity of kappa peptide agonist.
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Affiliation(s)
- X H Wan
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031, China
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23
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Huang XQ, Jiang HL, Luo XM, Chen KX, Ji RY, Cao Y, Pei G. Building three-dimensional structures of HIV-1 coreceptor CCR5 and its interaction with antagonist TAK779 by comparative molecular modeling. Acta Pharmacol Sin 2000; 21:521-8. [PMID: 11360686] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
AIM To study the mechanism of interaction of CCR5 receptor with its antagonist TAK779. METHODS Comparative molecular modeling has been used to develop the 3D-structural models of CCR5 receptor and its complex with TAK779. Molecular mechanics has been applied to optimize the above molecular models. Quantum mechanics has been utilized to calculate the structural information of TAK779. DOCK4.0 program is employed to dock the TAK779 molecular into the binding site of CCR5 receptor. RESULTS The 3D-structural model of CCR5 receptor is constructed using the 3D-model of frog rhodopsin as a template. The binding pocket is situated in the transmembrane helices 3, 5, 6, and 7, and it is composed of conserved residues of Tyr108, Gly111, Ser114, Glu283, Gly286, and Cys290, and conservatively varied residues including Thr105, Leu107, Phe112, Gly115, Lys197, and Met287. O1, N7, N17, and O19 of TAK779 are the active center of TAK779. The pyran cycle and the aminium group of TAK779 interact with residues in the binding pocket of CCR5 receptor, the other part of TAK779 interacts with residues from the extracellular loops of CCR5. The binding energy of TAK779 with CCR5 is -51.606 kcal/mol. CONCLUSION The model constructed and the interaction mode reported in the present study are useful in further understanding the molecular mechanism of receptor-virus recognition and designing new inhibitors of HIV-1 infection.
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Affiliation(s)
- X Q Huang
- Shanghai Institute of Materia Medica, Shanghai 200031, China
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Huang XQ, Jiang HL, Luo XM, Chen KX, Zhu YC, Ji RY, Cao Y. Comparative molecular modeling on 3D-structure of opioid receptor-like 1 receptor. Acta Pharmacol Sin 2000; 21:529-35. [PMID: 11360687] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
AIM To build the three-dimensional structure of opioid receptor-like 1 (ORL1) receptor. METHODS Structural elements of ORL1 receptor were predicted from sequence alignments of opioid and related receptors of G protein-coupled receptor (GPCR) based on (i) the consensus, biophysical interpretations of alignment-derived properties, and (ii) tertiary structural homology to frog rhodopsin; The extracellular loops of ORL1 were built by self-constructed database searching based on geometrical constraints; initial model was refined computationally with energy minimization by molecular mechanics method. RESULTS The calculated structure of ORL1 receptor has clusters of hydrogen bonds existing in interhelices and extracellular loops; the ORL1 receptor has a possible ligand-binding "crevice" situated on the extraside of the transmembrane domains between helices 3, 5, 6, and 7, which is partially covered by the extracellular loop 2 (EL-2); The binding cavity may consist of a "highly conserved region" involving the residues of Asp130, Tyr131, and an outer "conservatively variable region" containing the residues near the interface of transmembrane (TM) helices-EL loops; The molecular model obtained is qualitatively consistent with ligand affinities, hybrid peptide studies, and other experimental data. CONCLUSION The structural model of ORL1 receptor from this study is helpful for clarifying experimental observations of ligands interacting with opioid receptors, and for designing new biological investigations.
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Affiliation(s)
- X Q Huang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031, China
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25
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Huang XQ, Jiang HL, Luo XM, Chen KX, Zhu YC, Ji RY, Cao Y. Study on mechanism of interaction of nociceptin and opioids binding with opioid receptor-like 1 receptor. Acta Pharmacol Sin 2000; 21:536-46. [PMID: 11360688] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023] Open
Abstract
AIM To study the mechanism of interaction of nociceptin and opioids with ORL1 receptor. METHODS Molecular dynamics study was carried out before nociceptin was manually docked into the binding site of ORL1 receptor; DOCK4.0 program was applied to dock four stereoisomers of lofentanyl and etorphine into the binding pocket of ORL1 receptor; Binding energies were calculated, the relationship between binding energy and binding affinity was studied. RESULTS Nociceptin fits well into the binding pocket, the N-terminal FGGF tetrapeptide is located in the inner region of the binding cavity, the nociceptin (5-7) interacts with the conservatively variable residues near the other end of binding pocket, and maybe determines selectivity of ORL1 receptor over dynorphin A, the positively charged core of nociceptin (8-13) binds predominantly with negatively charged EL-2 loop, which is thought to be able to mediate receptor activation. The shortest fully active analogue of nociceptin (1-13) is also discussed. The main difference between these two opioids and nociceptin exists in the kinds and the number of conserved and variable residues in the binding pocket and thereafter in the strength of their interaction. Prediction for binding affinities of four stereoisomers of lofentanyl has been performed based on their binding energies, the similar pharmacophore of lofentanyl and other fentanyl analogs, and the good correlation between binding energies and their experimental binding affinities (-log Ki values). CONCLUSION Ligand docking results from this study are helpful in clarifying experimental observations of ligands interaction with opioid receptors, thus furthering biological investigations.
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Affiliation(s)
- X Q Huang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031, China
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26
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Huang XQ, Jiang HL, Luo XM, Rong SB, Gu JD, Tan XJ, Zhu YC, Chen KX, Ji RY, Cao Y. Molecular modeling on solvent effect and interaction mechanism of fentanyl analogs to mu-opioid receptor. Acta Pharmacol Sin 2000; 21:46-54. [PMID: 11263247] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
AIM To do theoretical study about solvation effect and interaction mechanism of fentanyl analogs (FA) to mu opioid receptor (microOR). METHODS Flexible docking (FlexiDock) was performed by using the possible active conformations of FA and optimized 3D structure of mu opioid receptor. Binding energies were calculated. Comparative molecular force field analysis (CoMFA) and quantitative structure activity relationship (QSAR) studies were carried out based on results of flexible docking. Solvation effects were considered by studying interaction of FA with water molecules. Partial least square (PLS) analysis was used to calculate regression equation for analgesic activities using binding energies as descriptive factor. RESULTS 1) Binding conformations of these analogs derived by flexible docking were reasonable. 2) It was most possible for the FA to exist in water solution in the form of binding conformations. 3) Energetic calculation and QSAR analysis showed a good correlation between the calculated binding energies of FA and their analgesic activities. 4) Based on the 3D-model, the possible interaction mechanism of FA with mu opioid receptor can be illustrated reasonably. CONCLUSION The nature of the correlation between the binding affinities and analgesic activities of FA was explained by our modeling result.
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Affiliation(s)
- X Q Huang
- Shanghai Institute of Materia Medica, Shanghai 200031, China
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Ye H, Wu JM, Yang YS, Ji RY, Chen KX. Antimycoplasmal activities of (S)-(-)-9-fluoro-2,3-dihydro-3-methyl-10 -[4-(2-pyridyl)-1-piperazinyl]-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine -6-carboxylic acid (YH-6) in comparison with other antibiotics in vitro. Zhongguo Yao Li Xue Bao 1999; 20:1031-4. [PMID: 11270970] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
AIM To determine the susceptibilities of Mycoplasma and Ureaplasma to (S)-(-)-9-fluoro-2,3-dihydro-3-methyl-10 -[4-(2-pyridyl)-1-piperazinyl]-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine -6-carboxylic acid (YH-6) and to compare it with those referential quinolones, macrolides, and tetracyclines. METHODS The minimum inhibitory concentration (MIC) were determined by microdilution method in vitro. RESULTS The MIC of YH-6 for Ureaplasma urealyticum (Uu: 250 micrograms.L-1), Mycoplasma hominis (Mh: 500 micrograms.L-1), M orale (Mo: 125 micrograms.L-1) and M salivarium (Ms: 125 micrograms.L-1) were closely similar to those of macrolides (erythromycin and leucomycin) and were 2-8 folds greater than those of ofloxacin (Ofl). Uu and Mh easily induced resistance to erythromycin and tetracycline. They did not easily form resistance to quinolone (YH-6, Ofl), josamycin and tylosin. Tetracycline-resistance (Tcr) or erythromycin-resistance (EMr) strains of Uu (or Mh) had cross-resistance to erythromycin or tetracycline. However, they had no cross-resistance to quinolone, josamycin and tylosin. CONCLUSION YH-6 was a highly active quinolone against Mycoplasma, but could hardly induce resistance to Uu. EMr- or Tcr- strains of Uu (or Mh) had no cross-resistance to YH-6.
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Affiliation(s)
- H Ye
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200032, China
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Abstract
[formula: see text] A concise asymmetric synthesis of the indole alkaloid (+)-geissoschizine (1) has been completed. The synthesis features the highly diastereoselective vinylogous Mannich reaction of 3 with 4 to give 5, which is elaborated into the key tetracyclic intermediate 7 in two steps. Following the stereoselective introduction of the ethylidene moiety to give 9, reduction of the lactam and radical decarboxylation via an acyl selenide gave 12, which was converted into (+)-geissoschizine by formylation. The synthesis requires only 11 chemical operations and proceeds in an overall yield of 17%.
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Affiliation(s)
- S F Martin
- Department of Chemistry and Biochemistry, University of Texas at Austin 78712, USA.
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Xu H, Lu YF, Partilla JS, Zheng QX, Wang JB, Brine GA, Carroll FI, Rice KC, Chen KX, Chi ZQ, Rothman RB. Opioid peptide receptor studies, 11: involvement of Tyr148, Trp318 and His319 of the rat mu-opioid receptor in binding of mu-selective ligands. Synapse 1999; 32:23-8. [PMID: 10188634 DOI: 10.1002/(sici)1098-2396(199904)32:1<23::aid-syn3>3.0.co;2-n] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [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: 11/08/2022]
Abstract
Previous data obtained with the cloned rat mu opioid receptor demonstrated that the "super-potent" opiates, ohmefentanyl (RTI-4614-4) and its four enantiomers, differ in binding affinity, potency, efficacy, and intrinsic efficacy. Molecular modeling (Tang et al., 1996) of fentanyl derivatives binding to the mu receptor suggests that Asp147, Tyr148, Trp318, and His319 are important residues for binding. According to this model, Asp147 interacts with the positively charged opiate agonist to form potent electrostatic and hydrogen-bonding interactions. In this study, the role of weak electrostatic and hydrogen-bonding "pi-pi" interactions of the O atom of the carbonyl group and the phenyl ring structures of RTI-4614-4 and its four enantiomers with residues Tyr148, Trp318, and His319 were explored via site-directed mutagenesis. Tyr148 (in transmembrane helix 3 {TMH3}), Trp318 (TMH7), and His319 (TMH7) were individually replaced with phenylalanine or alanine. Receptors transiently expressed in COS-7 cells were labeled with [125I]IOXY according to published procedures. Mutation of Tyr148 to phenylalanine reduced the binding affinities of some mu-selective agonists (2-7 fold) but did not alter the affinities of DAMGO, naloxone, and the non-selective opiates etorphine and buprenorphine. In contrast, this mutation significantly increased the binding affinities (decreased the Kd values) of [D-Ala2,D-Leu5]enkephalin, IOXY, and dermorphin. Mutation of Trp318 decreased opioid receptor binding to almost undetectable levels. Substitution of alanine for His319 significantly reduced binding affinities for the opioid ligands tested (1.3- to 48-fold), but did not alter the affinities of naloxone and bremazocine. These results indicate the importance of Tyrl48 and His319 for the binding of fentanyl derivatives to the mu receptor. Functional studies using the mutant receptors will provide additional insight into the mechanism of action of RTI-4614-4 and its four enantiomers.
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Affiliation(s)
- H Xu
- Clinical Psychopharmacology Section, Division of Intramural Research, NIDA, NIH, PO, Baltimore, Maryland 21224, USA
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Liu DX, Jiang HL, Shen JS, Zhu WL, Zhao L, Chen KX, Ji RY. Molecular modeling on kappa opioid receptor and its interaction with nonpeptide kappa opioid agonists. Zhongguo Yao Li Xue Bao 1999; 20:131-6. [PMID: 10437159] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
AIM To study the interaction between kappa-opioid receptor and its nonpeptide agonists. METHODS The "conservation patterns" for G-protein coupled receptors (GPCR) were used to determine 7 transmembrane (TM) regions. Taking the crystallographic coordinates of bacteriorhodopsin (BR) as the template, the 3D structural model was constructed for 7 TM of kappa-opioid subtype with molecular mechanics (MM) method. Five highly active nonpeptide kappa-opioid agonists were docked into the 7 helices of kappa-opioid receptor to study the ligand-receptor interaction. RESULTS Four important interactions between U-50488-like agonists and kappa-opioid receptors were drawn according to our modeling study: (1) the protonated pyrrolidine nitrogen of the ligands formed a hydrogen-bond with the carboxyl of Asp138; (2) the carbonyl oxygen of ligands forms a hydrogen bond to the hydroxyl of Ser187; (3) the aryl groups connected to acylamide of the agonists inserted into a hydrophobic cavity enclosed by residues Val239, Val236, Phe235, Val232, Leu186, and Trp183; (4) the pyrrolidine of the ligands in the complexes was surrounded by Ile290, Asp138, Ile194, Ile135, and Cys131. CONCLUSION The proposed interaction mechanism is helpful for further mutant experiments and designing novel potent kappa-opioid agonists.
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Affiliation(s)
- D X Liu
- Shanghai Institutes of Materia Medica, Chinese Academy of Sciences, China
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Liu SL, Pan JH, Shi DY, Chen KX, Wang QM, Chen SM, Yan XM. Relationship between structure and anti-oxidation of tocopherol with molecular orbit theory. Zhongguo Yao Li Xue Bao 1998; 19:513-8. [PMID: 10437135] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
AIM To explore the relationship between different structures of tocopherol (Toc) and some phenol compounds and their anti-oxidative activities. METHODS Use the ab initio calculation of molecular mechanics and quantum chemistry. RESULTS The anti-oxidation of Toc was related to the ability to release active hydrogen, i.e., related to the O-H electron populations, frontier orbital energy (au), and the decreased amount of energy at the reaction ending stage. The order of hydroxyl O-H electron populations in different Toc model molecules were alpha < gamma < or = beta < delta, which was consistent with their anti-oxidation reported. CONCLUSION The molecular orbit (MO) theory and the quantum chemical parameters can be used to analyze the anti-oxidation of phenol compounds with different structures.
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Affiliation(s)
- S L Liu
- Department of Biochemistry, Shanghai Medical University, China.
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Liu DX, Tang Y, Jiang HL, Chen KX, Ji RY. Establishment of kappa opioid receptor agonists pharmacophore with molecular modeling method. Zhongguo Yao Li Xue Bao 1998; 19:445-50. [PMID: 10375807] [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] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
AIM To build up nonpeptide kappa-opioid receptor agonists pharmacophore. METHODS Five structurally diverse, highly active nonpeptide kappa-opioid agonists were retrieved from MDL MDDR database. Molecular mechanics method were used to seek out 50 lower energy conformations for each compound. Taking nitrogen atom of pyrrolidine and acyl acetamide as overlay points, 5 agonists were superimposed to each other with their most favorite conformation. From the overlay map, the structure specificity of nonpeptide kappa-opioid receptor agonists were elucidated. RESULTS According to this pharmacophore, the pyrrolidine ring, the carbonyl group of acyl acetamide, and the hydrophobic group attached to acyl acetamide were suggested to be the structure-specific moieties of kappa-opioid agonists. Moreover, by comparing kappa 1-opioid receptor sequence of mouse with other G-protein-coupled receptors, we determined those conserve residues existing on transmembrane regions which might interact with the suggested groups. The carboxyl of Asp138 might interact with N atom of pyrrolidine by forming a hydrogen bond. The hydroxyl of Ser187 and the carbonyl group of kappa-opioid agonists might form another hydrogen bond, which was critical for its kappa selective affinity. The hydrophobic group attached to acyl acetamide might have hydrophobic interaction with aromatic residues of kappa-opioid receptors. CONCLUSION These kappa agonists pharmacophore were helpful to select specific positions in the lead compounds to be occupied by hydrophobic moieties to limit their ability to across the blood-brain barrier.
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Affiliation(s)
- D X Liu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Hu ZJ, Jiang HL, Chen JZ, Chen KX, Ji RY. Analysis of electronic structures of physostigmine analogs. Zhongguo Yao Li Xue Bao 1998; 19:322-6. [PMID: 10375776] [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] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
AIM To elucidate the action mechanism and structural prerequisites of 21 physostigmine analogs as acetylcholinesterase inhibitors at the molecular level, and help the rational design of these dihydroindoline inhibitors. METHODS Initial structures of these compounds were built and minimized by SYBYL 6.2 molecular modeling software. Conformations of those molecules with the highest predictive abilities in the Comparative Molecular Field Analysis model were chosen to the semiempirical quantum chemical calculations. RESULTS (1) The highest occupied molecular orbital (HOMO) consisted mainly of the orbitals in phenyl group and N1 atom; the lowest unoccupied molecular orbital (LUMO) of the molecules was contributed from phenyl group and C11 atom. While the HOMO energies did not show any recognizable relationship with activity, the LUMO energies showed a decreased tendency with increasing activity. The active compounds showed lower LUMO energies. (2) The carbon atom (C11) had the most positive net atom charge. The most active compound had the most positive charge on this carbon, but had the lower charges on the carbonyl oxygen (O12) which was the most negative charge atom. (3) The bond order of carbon-oxygen bond (C11-O10) was invariant across the series of the compounds. (4) Compounds with too high or too low total dipole moment had lower activities, while the most active one had a lower molecular polarizability. CONCLUSION A molecular model was suggested to explain the possible mode of action by which these compounds inhibit acetylcholinesterase.
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Affiliation(s)
- Z J Hu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Chen JZ, Hu LH, Jiang HL, Gu JD, Zhu WL, Chen ZL, Chen KX, Ji RY. A 3D-QSAR study on ginkgolides and their analogues with comparative molecular field analysis. Bioorg Med Chem Lett 1998; 8:1291-6. [PMID: 9871752 DOI: 10.1016/s0960-894x(98)00205-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 10/27/2022]
Abstract
Comparative molecular field analysis (CoMFA), a three-dimensional quantitative structure-activity relationship (3D-QSAR) paradigm was used to study the correlation between the physicochemical properties and the in vitro bioactivities of ginkgolide analogues. The correlation derived from CoMFA analysis has a good predictive capability. Based on the result of CoMFA analysis, we designed some compounds. Pharmacological assay indicated that three of these new designed compounds are 2 and 4 times more potent than that of ginkgolides.
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Affiliation(s)
- J Z Chen
- Shanghai Institute of Material Medica, Chinese Academy of Sciences, P.R. China
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35
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Liu DX, Jiang H, Wang QM, Chen KX, Ji RY. Interpreting the effect of methyl group at the three carbon bridge of (-)-huperzine A on its anticholinesterase activity by molecular dynamics method. Bioorg Med Chem Lett 1998; 8:419-22. [PMID: 9871590 DOI: 10.1016/s0960-894x(98)00042-0] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Based on the recently resolved crystal structure of complex (-)-huperzine A-AChE, we simulated the interaction between (-)-huperzine A analogues and AChE using molecular dynamics method. It was revealed that the methyl group at the three carbon bridge of (-)-huperzine A can form a weak hydrogen bond with the phenol hydroxyl oxygen of Tyr121 and the main-chain oxygen of Gly118 of AChE, respectively.
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Affiliation(s)
- D X Liu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Zhao SR, Jiang HL, Rong SB, Chen KX, Ji RY. Structure-activity relationship of channel binding affinity of quaternary ammonium ions. Zhongguo Yao Li Xue Bao 1997; 18:497-500. [PMID: 10322903] [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] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
AIM To explore the structure-activity relationship of quaternary ammonium (QA) ions at the external binding site of K+ channel. METHODS InsightII and MOPAC 6.0 molecular modeling package were used to calculate the free energy of hydration (delta Ghydration), the energy of the highest occupied orbital (EHOMO), and the energy of the lowest unoccupied orbital (ELUMO) for each QA ion, respectively. The partial least square method was used to analyze the relationship between the binding free energy and these descriptive parameters. RESULTS Generally, the higher the ELUMO of a QA ion was, the weaker its solvation was and accordingly the stronger binding affinity. For a QA ion larger than tetraethylammonium (TEA), its large size was unfavorable to its channel binding affinity. CONCLUSION The binding affinity of all QA ions correlated well with delta Ghydration and ELUMO.
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Affiliation(s)
- S R Zhao
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Zhao SR, Chen KX, Wang W, Gu JD, Hu ZJ, Ji RY. Molecular modeling of voltage-gated potassium channel pore. Zhongguo Yao Li Xue Bao 1997; 18:323-30. [PMID: 10072914] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
AIM To build a structure model for the pore of voltage-gated Shaker potassium channel and examine its validity. METHODS (1) Structural restraints were derived from experimental and theoretical studies; (2) An initial structural motif satisfying the derived restraints was first constructed, and further refined by restrained molecular mechanics; (3) The quality of the model was judged by the criterion that whether it could clarify molecular mechanisms of channel functions and explain the known experimental facts. RESULTS (1) A computer pore structure was proposed, in which the residues within signature sequence (corresponding to Shaker 439-446) dipped into the membrane and formed the narrow part of the pore in a non-periodic conformation, while the other residues in the P region constituted the outer mouth of the pore; (2) The ion selectivity was achieved through cation-pi orbital interaction mechanism at position 445 and oxygen cage mechanism at position 447; (3) Different binding modes led to different affinity of CTX and AgTx2 to channel; and (4) The inside of pore was dominated by negative electrostatic potential. CONCLUSION The model proposed was consistent with the derived restraints from the experimental results.
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Affiliation(s)
- S R Zhao
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Rong SB, Zhu YC, Jiang HL, Zhao SR, Wang QM, Chi ZQ, Chen KX, Ji RY. Molecular modeling of mu opioid receptor and receptor-ligand interaction. Zhongguo Yao Li Xue Bao 1997; 18:317-22. [PMID: 10072913] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
AIM To construct the 3D structural model of mu opioid receptor (mu OR) and study the interaction between mu OR and fentanyl derivatives. METHODS The 3D structure of mu OR was modeled using the bacteriorhodopsin (bRh) as a template, in which the alignments of transmembrane (TM) of bRh and mu OR were achieved by scoring the alignment between the amino acid sequence of mu OR and the structure of bRh. The fentanyl derivatives were docked into the 7 helices of mu OR and the binding energies were calculated. RESULTS (1) The receptor-ligand interaction models were obtained for fentanyl derivatives. (2) In these models, the fundamental binding sites were possibly Asp147 and His297. The negatively charged oxygen of Asp147 and the positively charged ammonium group of ligand formed the potent electrostatic and hydrogen-binding interactions. Whereas the interactions between the positively charged nitrogen of His297 and the carbonyl oxygen of ligand were weak. In addition, there were some pi-pi interactions between the receptor and the ligand. (3) The binding energies of the receptor-ligand complexes had a good correlation with the analgesic activities (-lg ED50) of the fentanyl derivatives. CONCLUSION This model is helpful for understanding the receptor-ligand interaction and for designing novel mu OR selective ligands.
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Affiliation(s)
- S B Rong
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China.
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Rong SB, Jiang HL, Chi ZQ, Chen KX, Zhu YC, Ji RY. Molecular modeling of interaction between delta opioid receptor and 3-methylfentanylisothiocyanate. Zhongguo Yao Li Xue Bao 1997; 18:219-24. [PMID: 10072937] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
AIM To construct a 3D structural model of delta opioid receptor (delta OR) and study its interaction with 3-methylfentanylisothiocyanate (SuperFIT). METHODS Using the bacteriohodopsin as a template, the 3D structure of delta OR was modeled; SuperFIT was docked into its inside. RESULTS The interaction model between delta OR and (3R, 4S)-SuperFIT was achieved, in which the important binding sites possibly were Asp128, Ser106, Phe104, Tyr308, and Pro315. Asp128 formed the electrostatic and hydrogen-binding interactions with the protonated nitrogen on piperidine of the ligand. Ser106 formed the electrostatic interaction with the N atom of isothiocyano group of the ligand; whereas Phe104, Tyr308, and Pro315 formed the hydrophobic interactions with the S atom of isothiocyano group. In addition, there were some other interactions between delta OR and the ligand. CONCLUSION The residues Phe104, Tyr308, Pro315, and Ser106 of delta OR are crucial to the delta selectivity of the ligand, which is beneficial for designing novel delta-selective ligand.
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Affiliation(s)
- S B Rong
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Rong SB, Zhu YC, Jiang HL, Wang QM, Zhao SR, Chen KX, Ji RY. Interaction models of 3-methylfentanyl derivatives with mu opioid receptors. Zhongguo Yao Li Xue Bao 1997; 18:128-32. [PMID: 10072963] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
AIM To study the interaction model of 3-methylfentanyl derivatives with mu opioid receptor. METHODS After a systematic conformational search, a three-dimensional quantitative structure-activity relationship study was carried out with comparative molecular field analysis (CoMFA). RESULTS 1) The 6 CoMFA models had good predictive values and each model corresponded to the minimum-energy conformations of 13 compounds studied; 2) The important geometric parameters of mu pharmacophore d1 (A), d2 (A), d3 (A), d4 (A), d5 (A), and d6 (A) were 5.2, 5.4, 4.9, 10.6, 10.2, and 5.8 in Model A; 5.2, 6.5, 3.6, 10.6, 11.6, and 5.8 in Model B; 5.2, 4.6, 4.9, 11.6, 9.2, and 6.5 in Model C; 5.2, 5.4, 4.9, 10.5, 10.3, and 5.8 in Model D; 3.6, 5.4, 4.9, 5.7, 7.5, and 5.7 in Model E; 5.2, 4.7, 4.9, 11.2, 9.5, and 6.4 in Model F, respectively. CONCLUSIONS The several bioactive conformations of fentanyl analogs possibly existed and did not need to be the absolute minimum-energy conformation, each of which was involved in the interaction with mu opioid receptor.
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Affiliation(s)
- S B Rong
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Jiang HL, Chen KX, Tang Y, Chen JZ, Li Q, Wang QM, Ji RY. Binding conformers searching method for ligands according to the structures of their receptors and its application to thrombin inhibitors. Zhongguo Yao Li Xue Bao 1997; 18:36-44. [PMID: 10072891] [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] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
AIM To develop a method of finding binding conformers for ligands according to the three-dimensional structures of their receptors. METHODS Combining the systematic search method of ligand with the molecular docking approach of ligand fitting into its receptor, we developed a binding conformer searching method for ligands. RESULTS The binding conformers of phosphonopeptidyl thrombin inhibitors were recognized. The binding (interaction) energies between these inhibitors and thrombin were calculated with molecular mechanical method. CONCLUSION Both of the total binding energies and steric binding energies have good correlations with the inhibitory activities of these thrombin inhibitors, demonstrating that our approach is reasonable. It can also be used to explain the inhibition mechanism of thrombin interacting with these inhibitors.
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Affiliation(s)
- H L Jiang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Tang Y, Chen KX, Jiang HL, Wang ZX, Ji RY, Chi ZQ. Molecular modeling of mu opioid receptor and its interaction with ohmefentanyl. Zhongguo Yao Li Xue Bao 1996; 17:156-60. [PMID: 9772668] [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] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
AIM To build up the structure model of mu opioid receptor, then combined with the receptor model, to investigate the action mechanism of ohmefentanyl on the receptor. METHODS Using the three-dimensional structure of bacteriorhodopsin as a template, we constructed mu opioid receptor model on computer. Ohmefentanyl was then docked into the supposed receptor binding sites. RESULTS A good ligand-receptor interaction model was achieved. The possible binding sites were found to be Asp147 and His319. The protonated N atom of ohmefentanyl form potent electrostatic and hydrogen-bonding interactions with residue Asp147 of the receptor, the O atom of the carbonyl group form weak electrostatic and hydrogen-bonding interactions with residue His319, and the two phenyl groups form pi-pi interactions with some aryl residues of the receptor around ligand. CONCLUSION The ligand-receptor interaction model should be helpful for rational design of novel analgesic.
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Affiliation(s)
- Y Tang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Tang Y, Chen KX, Jiang HL, Jin GZ, Ji RY. Molecular modeling of interactions between tetrahydroprotoberberines and dopamine receptors. Zhongguo Yao Li Xue Bao 1996; 17:8-12. [PMID: 8737443] [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] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
AIM To build up the structure models of dopamine receptors, then combined with the receptor models, to investigate the action mechanism of tetrahydroprotoberberines (THPB) on dopamine receptors at the molecular level. METHODS Using the three-dimensional structure of bacteriorhodopsin as a template, we have constructed dopamine D1 and D2 receptor models on computer. l-Stepholidine was selected as the leading compound of THPB and docked into D1 and D2 receptor active sites. RESULTS After manual adjustment and energy minimization, the ligand-receptor interaction models were achieved. Based on these models, the possible action mechanism of THPB on dopamine receptors was suggested that the protonated N atom of THPB form electrostatic interaction and hydrogen-bonding interaction with residue Asp in TM3 of the receptor, the two substituents in D ring of THPB form hydrogen-bonding interactions with two Ser residues in TM5 of the receptor, and the aryl groups form pi-pi interactions with some aryl residues of the receptor around ligand. CONCLUSION Our ligand-receptor interaction models should be helpful for rational design of more potent drugs.
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Affiliation(s)
- Y Tang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China
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Tang Y, Wang HW, Chen KX, Ji RY. QSAR of 3-methylfentanyl derivatives studied with neural networks method. Zhongguo Yao Li Xue Bao 1995; 16:26-32. [PMID: 7771191] [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] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
AIM To use neural networks, which simulate the functions of living nervous systems, in QSAR studies; METHODS Using the back-propagation neural networks program devised by us, combining with partial least squares (PLS) method, we studied the relationships of quantum chemical indices and analgesic activities of 25 3-methylfentanyl derivatives; RESULTS Through learning process, a good QSAR model was established, and the activities of these compounds were predicted; the correlation between the activities and quantum chemical indices: the net charge of the atom N1, the net charge of the atom O16, the torsional angle of atoms C10-C9-N8-C4, the interatomic distance between atom C7 and the center of phenyl plane C9-14 (PhA), is quite well-matched. Based on these results, an interactive pattern between 3-methylfentanyl derivatives and opioid receptors was suggested; CONCLUSION Not only are the results of neural networks superior to those of PLS method but they also provide accurate predictions of the activity of the compounds and also combine the PLS method with neural networks.
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Affiliation(s)
- Y Tang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences
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Jiang HL, Chen KX, Wang HW, Tang Y, Chen JZ, Ji RY. 3D-QSAR study on ether and ester analogs of artemisinin with comparative molecular field analysis. Zhongguo Yao Li Xue Bao 1994; 15:481-487. [PMID: 7709742] [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] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Comparative molecular field analysis (CoMFA), a three-dimensional quantitative structure-activity relationship (3D-QSAR) paradigm, was used to study the correlations between the physicochemical properties and the in vitro activities of a series of ether and ester analogs of artemisinin. Four alignment models were used in the CoMFA investigation. The correlations derived from CoMFA analysis with the four alignments proved all to have good predictive values. The steric field predictive model of alignment B is accordant with the experimental results of Avery M A, et al: J Med Chem 1993; 36: 4264-75. The electrostatic field predictive results of alignments A, B, and C are consistent with our previous result of quantum chemical calculation. The highest rcross2 of alignment D, indicated that the side chain of -C6-O2-O1-C10-O3-C7-O4-C12-O5- and atom C16 are important groups of artemisinin analogs for antimalarial activity.
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Affiliation(s)
- H L Jiang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences
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Zhou S, Chang TS, Guan WX, Chen KX, Wang SL, Cao YL, Huang WY. Microsurgical replantation of the avulsed scalp: report of six cases. J Reconstr Microsurg 1993; 9:121-5; discussion 125-9. [PMID: 8468702 DOI: 10.1055/s-2007-1006660] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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: 01/30/2023]
Abstract
This article reports the successful microsurgical replantation of six scalps avulsed for over 3 to 11 hr, after trauma and before repair, including five total and one partial avulsion. The authors believe that one key to successful replantation is effective vessel anastomoses. In the reported series, three scalps were reconstructed with two superficial temporal vessels and in five cases, with a 1:1 ratio between arteries and veins. The partially avulsed scalp was replanted successfully with only one artery and one vein. The management of postoperative complications is discussed.
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Affiliation(s)
- S Zhou
- Department of Plastic and Reconstructive Surgery, Shanghai 9th People's Hospital, China
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Abstract
The nonintercalative groove binding of a simplified model of olivomycin, to sequences d(CGCGCGC)2, d(TATATAT)2, and d(CICICIC)2 is investigated. A significant preference is displayed for the minor groove of the d(CG) sequence. This is due predominantly to the formation of H-bonds between the hydroxyl groups on the aglycone of the drug and the 2-amino group of the central guanine of the oligonucleotide.
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Affiliation(s)
- K X Chen
- Institut de Biologie Physico-Chimique, Laboratoire de Biochimie Théorique associé au CNRS, Paris, France
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Chen KX, Gresh N, Pullman B. Energetics and stereochemistry of DNA complexation with the antitumor AT specific intercalators tilorone and m-AMSA. Nucleic Acids Res 1988; 16:3061-73. [PMID: 3368315 PMCID: PMC336452 DOI: 10.1093/nar/16.7.3061] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [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: 01/05/2023] Open
Abstract
Computations by the SIBFA method on the intercalative interaction energies of tilorone and m-AMSA with B-DNA representative oligonucleotides account for the specificity of these antitumor drugs for AT sites and minor groove intercalation. In tilorone this specificity is due to the strong preference of the side chains for the minor groove, which overcomes the preference of the chromophore for a GC intercalation site. In m-AMSA the specificity is due to the combined preference of both the chromophore and the anilino side chain for AT intercalation site and minor groove, respectively. o-AMSA is shown to manifest a similar (although significantly less pronounced specificity) as m-AMSA but a higher affinity for DNA. A comparison of the energetics and stereochemistry of intercalative binding to DNA of m-AMSA (AT minor groove specific) and 9-aminoacridine-4-carboxamide (GC major groove specific), which possess the same chromophore and differ only by the nature and position of the side chains, shows the possibility of important variations in the intercalative behaviour of chromophoric drugs as a function of the substituent groups attached to them.
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Affiliation(s)
- K X Chen
- Institut de Biologie Physico-Chimique, CNRS, Paris, France
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Abstract
Theoretical quantitative evaluation of the intercalative binding to DNA of the new antitumor drug 9-aminoacridine-4-carboxamide indicates that, in contradiction with a recently proposed model, the compound should show specificity for interaction with the major (and not minor) groove of GC sequences.
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Affiliation(s)
- K X Chen
- Institut de Biologie Physico-Chimique, Laboratoire de Biochimie Théorique associé au CNRS, Paris, France
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