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Xu KZ, Xu P, li JJ, Zuo AF, Wang SB, Han F. Predictors and nomogram of in-hospital mortality in sepsis-induced myocardial injury: a retrospective cohort study. BMC Anesthesiol 2023; 23:230. [PMID: 37420185 PMCID: PMC10327384 DOI: 10.1186/s12871-023-02189-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 06/23/2023] [Indexed: 07/09/2023] Open
Abstract
BACKGROUND Sepsis-induced myocardial injury (SIMI) is a common organ dysfunction and is associated with higher mortality in patients with sepsis. We aim to construct a nomogram prediction model to assess the 28-day mortality in patients with SIMI. . METHOD We retrospectively extracted data from Medical Information Mart for Intensive Care (MIMIC-IV) open-source clinical database. SIMI was defined by Troponin T (higher than the 99th percentile of upper reference limit value) and patients with cardiovascular disease were excluded. A prediction model was constructed in the training cohort by backward stepwise Cox proportional hazards regression model. The concordance index (C-index), area under the receiver operating characteristics curve (AUC), net reclassification improvement (NRI), integrated discrimination improvement (IDI), calibration plotting and decision-curve analysis (DCA) were used to evaluate the nomogram. RESULTS 1312 patients with sepsis were included in this study and 1037 (79%) of them presented with SIMI. The multivariate Cox regression analysis in all septic patients revealed that SIMI was independently associated with 28-day mortality of septic patients. The risk factors of diabetes, Apache II score, mechanical ventilation, vasoactive support, Troponin T and creatinine were included in the model and a nomogram was constructed based on the model. The C-index, AUC, NRI, IDI, calibration plotting and DCA showed that the performance of the nomogram was better than the single SOFA score and Troponin T. CONCLUSION SIMI is related to the 28-day mortality of septic patients. The nomogram is a well-performed tool to predict accurately the 28-day mortality in patients with SIMI.
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Affiliation(s)
- Kai-Zhi Xu
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
| | - Ping Xu
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
| | - Juan-Juan li
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
| | - A-Fang Zuo
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
| | - Shu-Bao Wang
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
| | - Fang Han
- Emergency and Critical Care Center, Intensive Care Unit, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, 310000 China
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Guo HL, Shi FD, Zhou Q, Liu QY, Wang YX, Song Y, Wu ZS, Shi YH, Zhang L, Xu KZ, Song GD. Interleukin-1β Protection Against Experimental Sepsis in Mice. Inflammation 2020; 44:358-370. [PMID: 33044666 PMCID: PMC7548415 DOI: 10.1007/s10753-020-01341-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/21/2020] [Accepted: 09/08/2020] [Indexed: 01/25/2023]
Abstract
The inflammatory response involving interleukin-1β (IL-1β) has been thought to play an important role in the development of late-phase sepsis. However, in this study, we wanted to explore the possibility of using IL-1β to improve the prognosis of sepsis by triggering local differentiation of bone marrow cells (BMCs) into regulatory dendritic cells (DCs) in vivo, thereby reversing the immune paralysis in late-phase sepsis. Sepsis mouse models were induced by cecal ligation and puncture (CLP) and lethal Escherichia coli O18 infection. Mice were injected intraperitoneally with IL-1β after CLP and after the lethal infection. Septic BMCs and liver immune cells were isolated at 0, 3, 6, 9, and 14 days post-CLP. BMCs and liver cells isolated from septic mice treated with IL-1β were adoptively transferred into CLP mice. GFP+-C57BL/6 parabiosis models were established. Serum IL-1β levels were determined by enzyme-linked immunosorbent assay (ELISA) kit, and the number, ratio, and phenotype of immune cells were observed by flow cytometry. IL-1β treatment improved the survival of sepsis and increased the numbers of BMCs and liver immune cells in septic mice. Moreover, IL-1β stimulation increased the number and the percentage of CD11c−CD45RBhigh DCs in septic BM and liver. Adoptive transfer of septic BMCs, liver immune cells, and CD11c−CD45RBhigh DCs treated with IL-1β into CLP mice attenuated sepsis. IL-1β triggered the redistribution of CD11c−CD45RBhigh DCs as well as BMCs in parabiosis models. IL-1β protects against sepsis by stimulating local proliferation and differentiation of BMCs into CD11c−CD45RBhigh DCs at immune organs and non-immune organs.
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Affiliation(s)
- Hai-Lei Guo
- Department of Burns, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China.,Department of Burns, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, People's Republic of China
| | - Fu-Dong Shi
- Department of Orthopedics, Tangshan People's Hospital, Tangshan, Hebei, People's Republic of China
| | - Qi Zhou
- North China University of Science and Technology Graduate School, Tangshan, Hebei, People's Republic of China
| | - Qing-Yang Liu
- Department of Translational Medicine and Nephrology, Emergency General Hospital, Beijing, 100028, People's Republic of China.
| | - Yue-Xin Wang
- First Department of Orthopedics, Tangshan Worker's Hospital Affiliated to Hebei Medical University, Tangshan, Hebei, People's Republic of China
| | - Yang Song
- Department of Translational Medicine and Nephrology, Emergency General Hospital, Beijing, 100028, People's Republic of China
| | - Zong-Sheng Wu
- Department of Emergency, Zhongda Hospital Affiliated to Southeast University, Nanjing, People's Republic of China
| | - Yu-Hao Shi
- North China University of Science and Technology Graduate School, Tangshan, Hebei, People's Republic of China
| | - Liu Zhang
- Department of Translational Medicine and Nephrology, Emergency General Hospital, Beijing, 100028, People's Republic of China
| | - Kai-Zhi Xu
- Department of Anesthesiology, Tangshan Worker's Hospital Affiliated to Hebei Medical University, Tangshan, Hebei, People's Republic of China
| | - Guo-Dong Song
- Department of Burns, Jinan Central Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China. .,Department of Burns, Jinan Central Hospital Affiliated to Shandong University, Jinan, Shandong, People's Republic of China.
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Abstract
Silkworm (Bombyx mori) is an important economic insect with a fat body that plays a crucial role in the storage and transfer of nutrients. It is also known that TiO2 nanoparticles (NPs) can improve feed efficiency and promote silk protein synthesis in the silkworm. In this study, we profiled gene expression in the silkworm fat body after TiO2 NP treatment, validated the major RNA-seq findings, and determined the contents of trehalose and triglyceride, the activity of lipase, and the amount of total proteins. RNA-seq analysis revealed that TiO2 NP treatment caused significant expression changes in 341 genes (P≤0.01), 138 of which were upregulated while the other 203 were downregulated. The expression levels of two target genes in the insulin signaling pathway and two protein metabolism-related target genes, three lipid metabolism-associated target genes, two carbohydrate metabolism related target genes and expression levels of seven heat shock protein genes were increased, and that of threonine dehydratase gene and fatty acid transport protein gene were decreased. The RNA-seq results of 16 genes were validated by quantitative real-time PCR. The lipase activity, content of trehalose, and amount of total proteins were elevated by 3.86-fold, 1.34-fold, and 1.21-fold, respectively, and the content of triglyceride was decreased by 0.94-fold after TiO2 NP treatment. These results indicated that TiO2 NPs activated the insulin signaling pathway, promoted the metabolism of protein, fat, and carbohydrate, and improved nutrition metabolism. Our study provides new support for the understanding of the beneficial effect of TiO2 NPs on silkworm nutrient metabolism. Summary: Our study indicates that TiO2 nanoparticles promote nutrient metabolism in the fat body of silkworms, and provide a reference for studies investigating the biological function of TiO2 nanoparticles.
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Affiliation(s)
- J H Tian
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - J S Hu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - F C Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - M Ni
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - Y Y Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - B B Wang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - K Z Xu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - W D Shen
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - B Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
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Hu JS, Li FC, Xu KZ, Ni M, Wang BB, Tian JH, Li YY, Shen WD, Li B. Mechanisms of TiO2 NPs-induced phoxim metabolism in silkworm (Bombyx mori) fat body. Pestic Biochem Physiol 2016; 129:89-94. [PMID: 27017887 DOI: 10.1016/j.pestbp.2015.11.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/06/2015] [Accepted: 11/09/2015] [Indexed: 05/28/2023]
Abstract
Silkworm is an important economic insect. Abuse of organophosphorus pesticides in recent years often leads to poisoning of silkworms, which significantly affects sericulture development by reducing silk production. Previous studies have shown that TiO2 NPs can effectively mitigate the damages caused by organophosphorus pesticides in silk glands and nerve tissues. The fat body is an important metabolic detoxification organ of silkworms, but it is unknown whether TiO2 NPs affect pesticide metabolism in fat body. In this study, we characterized the transcription of antioxidant genes and enzyme activity in fat body after TiO2 NPs and phoxim treatments using transcriptome sequencing, real-time PCR, and enzyme activity assay. Transcriptome sequencing detected 10 720, 10 641, 10 403, and 10 489 genes for control group, TiO2 NPs group, phoxim group, and TiO2 NPs+phoxim group, respectively. The TiO2 NPs+phoxim group had 705 genes with significantly differential expression (FDR<0.001), among which the antioxidant genes thioredoxin reductase 1 and glutathione S-transferase omega 3 were significantly upregulated. In phoxim group, the expression levels of superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase delta (GSTd), and thioredoxin peroxidase (TPx) were increased by 1.365 -fold, 1.335 -fold, 1.642 -fold, and 1.765 -fold, respectively. The level changes of SOD, CAT, GSTd, and TPx were validated by real time PCR. The contents of reactive oxygen species (ROS), malondialdehyde (MDA), and hydrogen peroxide (H2O2) were increased by 1.598 -fold, 1.946 -fold, and 1.506 -fold, respectively, indicating that TiO2 NPs treatment can relieve phoxim-induced oxidative stress. To clarify the mechanism of TiO2 NPs's effect, the transcription levels of P450 gene family were measured for the TiO2 NPs+phoxim group; the expression levels of CYP4M5, CYP6AB4, CYP6A8, and CYP9G3 were elevated by 2.784 -fold, 3.047 -fold, 2.254 -fold, and 4.253 -fold, respectively, suggesting that high expression of P450 family genes can enhance the metabolism of phoxim in the fat body. The results of this study indicated that TiO2 NPs treatment promoted the transcriptional expression of the P450 family genes to improve the fat body's ability to metabolize phoxim and reduce phoxim-induced oxidative stress. This may be the main mechanism of TiO2 NPs' mitigation of phoxim-induced damages in the fat body.
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Affiliation(s)
- J S Hu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - F C Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - K Z Xu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - M Ni
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - B B Wang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - J H Tian
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Y Y Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - W D Shen
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - B Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, PR China.
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Wang BB, Li FC, Xu KZ, Ni M, Hu JS, Tian JH, Li YY, Shen WD, Li B. Effects of mutations on the structure and function of silkworm type 1 acetylcholinesterase. Pestic Biochem Physiol 2016; 129:1-6. [PMID: 27017875 DOI: 10.1016/j.pestbp.2015.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 11/09/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
AChE is the target of organophosphate (OP) and carbamate (CB) pesticides, and mutations in the gene can significantly reduce insects' sensitivity to these pesticides. Bombyx mori is highly sensitive to pesticides. To investigate the effects of mutations on AChE1 structure and function, we used a prokaryotic system to express B.mori wild type AChE1 (wAChE1) and mutant AChE1 (mAChE1) in this study. Active AChE1 proteins were obtained after refolding and purification, and wAChE1 and mAChE1 had similar activities. After incubation with 10(-6)M physostigmine and 10(-3)mg/mL phoxim, the remaining enzyme activity of mAChE1 was 4.42% and 8.86% higher than that of wAChE1's, respectively. Three-dimensional analysis of mutation AChE1 (mAChE1) revealed that the Ser and Ala side chains extended toward the central part of S285 with distances of just 2.80Å and 3.68Å, respectively, which changed the spatial structure of the active center and reduced its sensitivity to pesticides. These results indicated that the mutations altered the 3D structure of AChE1, which may affect the binding of physostigmine and phoxim to the serine residue at the active center, leading to reduced sensitivity. Our study helps understand the relationship between AChE1 mutations and pesticide resistance and provides a new direction for the cultivation of new pesticide-resistant varieties of B.mori.
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Affiliation(s)
- B B Wang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - F C Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - K Z Xu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - M Ni
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - J S Hu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - J H Tian
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Y Y Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - W D Shen
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - B Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, PR China.
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Gu ZY, Li FC, Wang BB, Xu KZ, Ni M, Zhang H, Shen WD, Li B. Differentially expressed genes in the fat body of Bombyx mori in response to phoxim insecticide. Pestic Biochem Physiol 2015; 117:47-53. [PMID: 25619911 DOI: 10.1016/j.pestbp.2014.10.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 08/29/2014] [Accepted: 10/07/2014] [Indexed: 06/04/2023]
Abstract
The silkworm, Bombyx mori, is an economically important insect. However, poisoning of silkworms by organophosphate pesticides causes tremendous loss to the sericulture. The fat body is the major tissue involved in detoxification and produces antimicrobial peptides and regulates hormones. In this study, a microarray system comprising 22,987 oligonucluotide 70-mer probes was employed to examine differentially expressed genes in the fat body of B. mori exposed to phoxim insecticide. The results showed that a total of 774 genes were differentially expressed upon phoxim exposure, including 500 up-regulated genes and 274 down-regulated genes. The expression levels of eight detoxification-related genes were up-regulated upon phoxim exposure, including six cytochrome P450s and two glutathione-S-transferases. It was firstly found that eight antimicrobial peptide genes were down-regulated, which might provide important references for studying the larvae of B. mori become more susceptible to microbial infections after phoxim treatment. In addition, we firstly detected the expression level of metamorphosis-related genes after phoxim exposure, which may lead to impacted reproduction. Our results may facilitate the overall understanding of the molecular mechanism of multiple pathways following exposure to phoxim insecticide in the fat body of B. mori.
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Affiliation(s)
- Z Y Gu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - F C Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - B B Wang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - K Z Xu
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - M Ni
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - H Zhang
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China
| | - W D Shen
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
| | - B Li
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, China; National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China.
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Ma L, Xie Y, Gu ZY, Wang BB, Li FC, Xu KZ, Shen WD, Li B. Characteristics of phoxim-exposed gene transcription in the silk gland of silkworms. Pestic Biochem Physiol 2013; 107:391-397. [PMID: 24267702 DOI: 10.1016/j.pestbp.2013.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 10/15/2013] [Accepted: 10/18/2013] [Indexed: 06/02/2023]
Abstract
Silkworm (Bombyx mori), a model Lepidoptera insect, is an important economic insect. Its silk gland is the important organ for silk protein synthesis and secretion. Phoxim exposure causes deficient cocooning of silkworm and has become one of the major negative factors for the silk industry. To study the impact of phoxim exposure on silk gland, using gene chip technology, we examined differentially expressed genes in silk gland after silkworms were exposed to phoxim (4.0μg/mL) for 24h. Functional annotation, classification and KEGG signaling pathway analysis were performed. The results showed that out of 3206 genes detected in silk gland after phoxim exposure, 270 were differentially expressed significantly, including 249 up-regulated genes and 21 down-regulated genes. These differentially expressed genes related to apoptosis, detoxification and protein degradation were selected. Using qRT-PCR, the expression levels of 9 genes involved in apoptosis, detoxification and protein degradation were validated. In addition, the expression profiles of three related fibroin synthesis genes (Fib-H, Fib-L and P25) were analyzed. Our results showed that phoxim exposure induced apoptosis of silk gland cells and inhibition of fibroin synthesis. This may be the cause of deficient silkworm cocooning.
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Affiliation(s)
- L Ma
- School of Basic Medicine and Biological Sciences, Soochow University, Suzhou, Jiangsu 215123, PR China
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Zhang MS, Yan HY, Zhao N, Lin XY, Pang JS, Xu KZ, Liu LX, Liu B. Endosperm-specific hypomethylation, and meiotic inheritance and variation of DNA methylation level and pattern in sorghum (Sorghum bicolor L.) inter-strain hybrids. Theor Appl Genet 2007. [PMID: 17486309 DOI: 10.1016/j.plantsci.2007.01.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Understanding dynamics and inheritance of DNA methylation represents important facets for elucidating epigenetic paradigms in plant development and evolution. Using four sets of sorghum (Sorghum bicolor L.) inter-strain hybrids and their inbred parents, the developmental stability and inheritance of cytosine methylation in two tissues, leaf and endosperm, by MSAP analysis were investigated. It was found that in all lines (inbred and hybrid) studied, endosperm exhibited a markedly reduced level of full methylation of the external cytosine or both cytosines at the CCGG sites relative to leaf, which caused a variable reduction in the estimated total methylation level in endosperm by 6.89-19.69% (11.47% on average). For both tissues, a great majority of cytosine methylation profiles transmitted to F1 hybrids, however, from 1.69 to 3.22% of the profiles showed altered patterns in hybrids. Both inherited and altered methylation profiles can be divided into distinct groups, and their frequencies are variable among the cross-combinations, and between the two tissues. The variations in methylation level and pattern detected in the hybrids were not caused by parental heterozygosity, and they could be either non-random or stochastic among hybrid individuals. Homology analysis of isolated bands that showed endosperm-specific hypomethylation or variation in hybrids indicated that diverse sequences were involved, including known-function cellular genes and mobile elements. RT-PCR analysis of six genes representing endosperm-specific hypomethylation in MSAP profiles indicated that all showed higher expression in endosperm than in leaf, suggesting involvement of methylation state in regulating tissue-specific or tissue-biased expression in sorghum. Analysis on leaf-RNA from 5-azacytidine-treated plants further corroborated this possibility.
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Affiliation(s)
- M S Zhang
- Laboratory of Plant Molecular Epigenetics, Institute of Genetics and Cytology, Northeast Normal University, Changchun, 130024, China
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9
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Zhang MS, Yan HY, Zhao N, Lin XY, Pang JS, Xu KZ, Liu LX, Liu B. Endosperm-specific hypomethylation, and meiotic inheritance and variation of DNA methylation level and pattern in sorghum (Sorghum bicolor L.) inter-strain hybrids. Theor Appl Genet 2007; 115:195-207. [PMID: 17486309 DOI: 10.1007/s00122-007-0555-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2006] [Accepted: 04/14/2007] [Indexed: 05/15/2023]
Abstract
Understanding dynamics and inheritance of DNA methylation represents important facets for elucidating epigenetic paradigms in plant development and evolution. Using four sets of sorghum (Sorghum bicolor L.) inter-strain hybrids and their inbred parents, the developmental stability and inheritance of cytosine methylation in two tissues, leaf and endosperm, by MSAP analysis were investigated. It was found that in all lines (inbred and hybrid) studied, endosperm exhibited a markedly reduced level of full methylation of the external cytosine or both cytosines at the CCGG sites relative to leaf, which caused a variable reduction in the estimated total methylation level in endosperm by 6.89-19.69% (11.47% on average). For both tissues, a great majority of cytosine methylation profiles transmitted to F1 hybrids, however, from 1.69 to 3.22% of the profiles showed altered patterns in hybrids. Both inherited and altered methylation profiles can be divided into distinct groups, and their frequencies are variable among the cross-combinations, and between the two tissues. The variations in methylation level and pattern detected in the hybrids were not caused by parental heterozygosity, and they could be either non-random or stochastic among hybrid individuals. Homology analysis of isolated bands that showed endosperm-specific hypomethylation or variation in hybrids indicated that diverse sequences were involved, including known-function cellular genes and mobile elements. RT-PCR analysis of six genes representing endosperm-specific hypomethylation in MSAP profiles indicated that all showed higher expression in endosperm than in leaf, suggesting involvement of methylation state in regulating tissue-specific or tissue-biased expression in sorghum. Analysis on leaf-RNA from 5-azacytidine-treated plants further corroborated this possibility.
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Affiliation(s)
- M S Zhang
- Laboratory of Plant Molecular Epigenetics, Institute of Genetics and Cytology, Northeast Normal University, Changchun, 130024, China
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Ji Q, Wu SL, Feng RF, Zhang XJ, Zhu LF, Zhong ZP, Xu KZ, Zheng Y. Absolute generalized oscillator strengths of 4s, 4s', 4p+4p' excitations of argon determined by the angle-resolved electron-energy-loss spectrometer. Phys Rev A 1996; 54:2786-2791. [PMID: 9913791 DOI: 10.1103/physreva.54.2786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Xu KZ, Feng RF, Wu SL, Ji Q, Zhang XJ, Zhong ZP, Zheng Y. Absolute generalized oscillator strengths of 2 1S and 2 1P excitations of helium measured by angle-resolved electron-energy-loss spectroscopy. Phys Rev A 1996; 53:3081-3086. [PMID: 9913245 DOI: 10.1103/physreva.53.3081] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Xu XL, Hao LY, Xu KZ, Chen TP, Fung S. Cathodoluminescence from interband transitions in germanium (111) and gallium arsenide (100) crystals. Phys Rev B Condens Matter 1995; 52:1452-1455. [PMID: 9981192 DOI: 10.1103/physrevb.52.1452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wu SL, Zhong ZP, Feng RF, Xing SL, Yang BX, Xu KZ. Electron-impact study in valence and autoionization resonance regions of argon. Phys Rev A 1995; 51:4494-4500. [PMID: 9912137 DOI: 10.1103/physreva.51.4494] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Xing SL, Shi QC, Chen XJ, Xu KZ, Yang BX, Wu SL, Feng RF. Absolute total-cross-section measurements for intermediate-energy electron scattering on C2H2 and CO. Phys Rev A 1995; 51:414-417. [PMID: 9911599 DOI: 10.1103/physreva.51.414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Ma Q, Cao XF, Xu KZ. [One stage resection of esophageal cancer and pulmonary bulla--a report of three patients]. Zhonghua Zhong Liu Za Zhi 1986; 8:231-2. [PMID: 3743355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Since 1982, three patients with esophageal cancer complicated with pulmonary bullae have been treated by operation on the esophagus and lung in one performance: In all the patients, the bullae were on the same side of the operation. The esophageal or cardiac cancer was resected first, then the bulla was treated. The site of esophago-gastric anastomosis was reinforced by the greater omentum. For mid-upper esophageal cancer, cervical anastomosis was done in order to avoid infection or leakage. In the third patient, pyopneumothorax occurred after wedge resection of a large bulla in the right upper lung and the surrounding tissues. The patient survived after timely drainage and medical management. The extent of resection for pulmonary bulla (bulla, segment or lobe) depends on the location, shape, size and number of the bullae and the pathological change in the surrounding tissues. We suggest that the indications: Cardio-pulmonary functions of the patient be stage II or better, even with mild emphysema so as they can tolerate anesthesia and surgery. Pulmonary function can be compensated after the lesion is removed, otherwise it is taken as a contraindication. The one stage removal of two foci makes it possible to avoid postoperative complications.
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