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Ma Y, Guo T, Ding J, Dong Z, Ren Y, Lu C, Zhao Y, Guo X, Cao G, Li B, Gao P. RNA-seq analysis of small intestine transcriptional changes induced by starvation stress in piglets. Anim Biotechnol 2024; 35:2295931. [PMID: 38147885 DOI: 10.1080/10495398.2023.2295931] [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] [Indexed: 12/28/2023]
Abstract
Piglets may experience a variety of stress injuries, but the molecular regulatory mechanisms underlying these injuries are not well understood. In this study, we analysed the ileum of Large White (LW) and Mashen (MS) piglets at different times of starvation using chemical staining and transcriptome analysis. The intestinal barrier of piglets was damaged after starvation stress, but the intestinal antistress ability of MS piglets was stronger than LW piglets. A total of 8021 differentially expressed genes (DEGs) were identified in two breeds. Interestingly, the immune capacity (CHUK, TLR3) of MS piglets increased significantly after short-term starvation stress, while energy metabolism (NAGS, PLA2G12B, AGCG8) was predominant in LW piglets. After long-term starvation stress, the level of energy metabolism (PLIN5, PLA2G12B) was significantly increased in MS piglets. The expression of immune (HLA-DQB1, IGHG4, COL3A1, CD28, LAT) and disease (HSPA1B, MINPPI, ADH1C, GAL3ST1) related genes were significantly increased in two breeds of piglets. These results suggest that short-term stress mainly enhances immunity and energy metabolism in piglets, while long-term starvation produces greater stress on piglets, making it difficult for them to compensate for the damage to their bodies through self-regulation. This information can help improve the stress resistance of piglets through molecular breeding.
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Affiliation(s)
- Yijia Ma
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Tong Guo
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Jianqin Ding
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Zhiling Dong
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Yifei Ren
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Chang Lu
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Yan Zhao
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Xiaohong Guo
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Guoqing Cao
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Bugao Li
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Pengfei Gao
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi, China
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Xue M, Xu P, Wen H, Chen J, Wang Q, He J, He C, Kong C, Song C, Li H. Peroxisome Proliferator-Activated Receptor Signaling-Mediated 13-S-Hydroxyoctadecenoic Acid Is Involved in Lipid Metabolic Disorder and Oxidative Stress in the Liver of Freshwater Drum, Aplodinotus grunniens. Antioxidants (Basel) 2023; 12:1615. [PMID: 37627610 PMCID: PMC10451990 DOI: 10.3390/antiox12081615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 08/04/2023] [Accepted: 08/12/2023] [Indexed: 08/27/2023] Open
Abstract
The appropriate level of dietary lipids is essential for the nutrient requirements, rapid growth, and health maintenance of aquatic animals, while excessive dietary lipid intake will lead to lipid deposition and affect fish health. However, the symptoms of excessive lipid deposition in the liver of freshwater drums (Aplodinotus grunniens) remain unclear. In this study, a 4-month rearing experiment feeding with high-fat diets and a 6-week starvation stress experiment were conducted to evaluate the physiological alteration and underlying mechanism associated with lipid deposition in the liver of A. grunniens. From the results, high-fat-diet-induced lipid deposition was associated with increased condition factor (CF), viscerosomatic index (VSI), and hepatosomatic index (HSI). Meanwhile, lipid deposition led to physiological and metabolic disorders, inhibited antioxidant capacity, and exacerbated the burden of lipid metabolism. Lipid deposition promoted fatty acid synthesis but suppressed catabolism. Specifically, the transcriptome and metabolome showed significant enrichment of lipid metabolism and antioxidant pathways. In addition, the interaction analysis suggested that peroxisome proliferator-activated receptor (PPAR)-mediated 13-S-hydroxyoctadecenoic acid (13 (s)-HODE) could serve as the key target in regulating lipid metabolism and oxidative stress during lipid deposition in A. grunniens. Inversely, with a lipid intake restriction experiment, PPARs were confirmed to regulate lipid expenditure and physiological homeostasis in A. grunniens. These results uncover the molecular basis of and provide specific molecular targets for fatty liver control and prevention, which are of great importance for the sustainable development of A. grunniens.
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Affiliation(s)
- Miaomiao Xue
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
| | - Pao Xu
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Haibo Wen
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Jianxiang Chen
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Qingyong Wang
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
| | - Jiyan He
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
| | - Changchang He
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
| | - Changxin Kong
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
| | - Changyou Song
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
| | - Hongxia Li
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China; (M.X.); (P.X.); (H.W.); (J.C.); (Q.W.); (J.H.); (C.H.); (C.K.)
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
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Lin Z, Wu Z, Huang C, Lin H, Zhang M, Chen M, Han K, Huang W, Ruan S. Cloning and expression characterization of elongation of very long-chain fatty acids protein 6 ( elovl6) with dietary fatty acids, ambient salinity and starvation stress in Scylla paramamosain. Front Physiol 2023; 14:1221205. [PMID: 37520818 PMCID: PMC10382226 DOI: 10.3389/fphys.2023.1221205] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 06/28/2023] [Indexed: 08/01/2023] Open
Abstract
Introduction: Elongation of very long-chain fatty acids protein 6 (ELOVL6) played crucial roles in regulating energy expenditure and fatty acid metabolism. Many studies have performed to investigate the physiological roles and regulatory mechanisms of elovl6 in fish and animals, while few studies were reported in crustaceans. Methods: Here we reported on the molecular cloning, tissue distribution and expression profiles in response to dietary fatty acids, ambient salinity and starvation stress in Scylla paramamosain by using rapid amplification of cDNA ends (RACE) and quantitative real-time PCR. Results: Three elovl6 isoforms (named elovl6a, elovl6b and elovl6c) were isolated from S. paramamosain in the present study. The complete sequence of elovl6a was 1345 bp, the full-length sequence of elovl6b was 1419 bp, and the obtained elovl6c sequence was 1375 bp in full length. The elovl6a, elovl6b and elovl6c encoded 287, 329 and 301 amino acids respectively, and exhibited the typical structural features of ELOVL protein family members. Phylogenetic analysis showed that the ELOVL6a from S. paramamosain clustered most closely to ELOVL6 from Portunus trituberculatus and Eriocheir sinensis, while the ELOVL6b and ELOVL6c from S. paramamosain gathered alone into a single branch. Quantitative real-time PCR exhibited that the relatively abundant expression of elovl6b was observed in intestine and stomach, and the elovl6a and elovl6c were highly expressed in hepatopancreas. In addition, studies found that replacing fish oil with soybean oil could significantly increase the transcriptional levels of three elovl6 in hepatopancreas of S. paramamosain, and the expression of elovl6a and elovl6c in hepatopancreas were more sensitive to dietary fatty acids than the elovl6b. Compared with the normal sea water group (27‰), the expression of sterol-regulatory element binding protein1c (srebp-1), elovl6a, elovl6b and elovl6c were upregulated in the low salinity groups, particularly in 7‰. On the contrary, the starvation stress suppressed the expression of srebp-1, elovl6a, elovl6b and elovl6c. Discussion: These results may contribute to understand the functions of elovl6 in fatty acid synthesis and regulatory mechanisms in crustaceans.
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Affiliation(s)
- Zhideng Lin
- College of Life Science, Ningde Normal University, Ningde, China
- Engineering Research Center of Mindong Aquatic Product Deep-Processing, Ningde Normal University, Ningde,China
| | - Zhouyu Wu
- College of Life Science, Ningde Normal University, Ningde, China
| | - Chaoyang Huang
- College of Life Science, Ningde Normal University, Ningde, China
| | - Huangbin Lin
- College of Life Science, Ningde Normal University, Ningde, China
| | - Mingyao Zhang
- College of Life Science, Ningde Normal University, Ningde, China
| | - Mingfeng Chen
- College of Life Science, Ningde Normal University, Ningde, China
| | - Kunhuang Han
- College of Life Science, Ningde Normal University, Ningde, China
- Engineering Research Center of Mindong Aquatic Product Deep-Processing, Ningde Normal University, Ningde,China
| | - Weiqing Huang
- College of Life Science, Ningde Normal University, Ningde, China
- Engineering Research Center of Mindong Aquatic Product Deep-Processing, Ningde Normal University, Ningde,China
| | - Shaojiang Ruan
- College of Life Science, Ningde Normal University, Ningde, China
- Engineering Research Center of Mindong Aquatic Product Deep-Processing, Ningde Normal University, Ningde,China
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Petrova O, Parfirova O, Gogoleva N, Vorob'ev V, Gogolev Y, Gorshkov V. The Role of Intercellular Signaling in the Regulation of Bacterial Adaptive Proliferation. Int J Mol Sci 2023; 24:ijms24087266. [PMID: 37108429 PMCID: PMC10138535 DOI: 10.3390/ijms24087266] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Bacterial adaptation is regulated at the population level with the involvement of intercellular communication (quorum sensing). When the population density is insufficient for adaptation under starvation, bacteria can adjust it to a quorum level through cell divisions at the expense of endogenous resources. This phenomenon has been described for the phytopathogenic bacterium Pectobacterium atrosepticum (Pba), and it is called, in our study, adaptive proliferation. An important attribute of adaptive proliferation is its timely termination, which is necessary to prevent the waste of endogenous resources when the required level of population density is achieved. However, metabolites that provide the termination of adaptive proliferation remained unidentified. We tested the hypothesis of whether quorum sensing-related autoinducers prime the termination of adaptive proliferation and assessed whether adaptive proliferation is a common phenomenon in the bacterial world. We showed that both known Pba quorum sensing-related autoinducers act synergistically and mutually compensatory to provide the timely termination of adaptive proliferation and formation of cross-protection. We also demonstrated that adaptive proliferation is implemented by bacteria of many genera and that bacteria with similar quorum sensing-related autoinducers have similar signaling backgrounds that prime the termination of adaptive proliferation, enabling the collaborative regulation of this adaptive program in multispecies communities.
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Affiliation(s)
- Olga Petrova
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
| | - Olga Parfirova
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
| | - Natalia Gogoleva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Tatarstan, Russia
| | - Vladimir Vorob'ev
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Tatarstan, Russia
| | - Yuri Gogolev
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Tatarstan, Russia
| | - Vladimir Gorshkov
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 420111 Kazan, Tatarstan, Russia
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Tatarstan, Russia
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Chong K, Almsherqi ZA, Zhuo R, Deng Y. Plasmalogen-rich foods promote the formation of cubic membranes in amoeba Chaos under stress conditions. FEBS Open Bio 2021. [PMID: 34184425 PMCID: PMC8329783 DOI: 10.1002/2211-5463.13241] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/11/2021] [Accepted: 06/28/2021] [Indexed: 11/11/2022] Open
Abstract
Previous studies have indicated that the ability to form cubic membrane (CM), a three-dimensional periodic structure with cubic symmetry, in amoeba (Chaos carolinense) under stress conditions depends on the type of food organism supplied before cell starvation. The significant increase in docosapentaenoic acid (DPA; C22:5n-6) during the starvation period has been reported to induce CM formation and support Chaos cell survival. In this article, we further investigated the lipid profiles of food organisms of the Chaos cells to reveal the key lipid components that might promote CM formation. Our results show that the lipids extracted from cells of the native food organism Paramecium multimicronucleatum are enriched in plasmalogens. More specifically, plasmalogen phosphatidylcholine and plasmalogen phosphatidylethanolamine might be the key lipids that trigger CM formation in Chaos cells under starvation stress conditions. Unexpectedly, CM formation in these cells is not supported when the native food organism was replaced with plasmalogen-deficit Tetrahymena pyriformis cells. Based on a previous lipidomics study on amoeba Chaos and this study on the lipid composition of its food organisms, three key lipids (plasmalogen phosphatidylcholine, plasmalogen phosphatidylethanolamine and diacyl-phosphatidylinositol) were identified and used for liposomal construction. Our in vitro study revealed the potential role of these lipids in a nonlamellar phase transition. The negative staining transmission electron microscopy data of our liposomal constructs support the notion that plasmalogens may curve the membrane, which, in turn, may facilitate membrane fusion and vesicular formation, which is crucial for membrane dynamics and trafficking.
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Affiliation(s)
- Ketpin Chong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Zakaria A Almsherqi
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Ruijiang Zhuo
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, China
| | - Yuru Deng
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, China.,Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, China
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Zhang DW, Xiao ZJ, Zeng BP, Li K, Tang YL. Insect Behavior and Physiological Adaptation Mechanisms Under Starvation Stress. Front Physiol 2019; 10:163. [PMID: 30890949 PMCID: PMC6411660 DOI: 10.3389/fphys.2019.00163] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 02/11/2019] [Indexed: 01/09/2023] Open
Abstract
Intermittent food shortages are commonly encountered in the wild. During winter or starvation stress, mammals often choose to hibernate while insects-in the form of eggs, mature larvae, pupae, or adults opt to enter diapause. In response to food shortages, insects may try to find sufficient food to maintain normal growth and metabolism through distribution of populations or even migration. In the face of hunger or starvation, insect responses can include changes in behavior and/or maintenance of a low metabolic rate through physiological adaptations or regulation. For instance, in order to maintain homeostasis of the blood sugar, trehalose under starvation stress, other sugars can be transformed to sustain basic energy metabolism. Furthermore, as the severity of starvation increases, lipids (especially triglycerides) are broken down to improve hunger resistance. Starvation stress simultaneously initiates a series of neural signals and hormone regulation processes in insects. These processes involve neurons or neuropeptides, immunity-related genes, levels of autophagy, heat shock proteins and juvenile hormone levels which maintain lower levels of physiological metabolic activity. This work focuses on hunger stress in insects and reviews its effects on behavior, energy reserve utilization, and physiological regulation. In summary, we highlight the diversity in adaptive strategies of insects to hunger stress and provides potential ideas to improve hunger resistance and cold storage development of natural enemy insects. This gist of literature on insects also broadens our understanding of the factors that dictate phenotypic plasticity in adjusting development and life histories around nutritionally optimal environmental conditions.
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Affiliation(s)
- Dao-Wei Zhang
- School of Biological and Agricultural Science and Technology, Zunyi Normal University, Zunyi, China
| | - Zhong-Jiu Xiao
- School of Biological and Agricultural Science and Technology, Zunyi Normal University, Zunyi, China
| | - Bo-Ping Zeng
- School of Biological and Agricultural Science and Technology, Zunyi Normal University, Zunyi, China
| | - Kun Li
- School of Biological and Agricultural Science and Technology, Zunyi Normal University, Zunyi, China
| | - Yan-Long Tang
- School of Biological and Agricultural Science and Technology, Zunyi Normal University, Zunyi, China
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7
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Liu B, Mao X, Huang D, Li F, Dong N. Novel role of NLRP3-inflammasome in regulation of lipogenesis in fasting-induced hepatic steatosis. Diabetes Metab Syndr Obes 2019; 12:801-811. [PMID: 31239738 PMCID: PMC6551611 DOI: 10.2147/dmso.s206558] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 04/11/2019] [Indexed: 12/24/2022] Open
Abstract
Background: The liver coordinates a series of metabolic adaptations to maintain the energy balance of the system and provide adequate nutrients to key organs, tissues and cells during starvation. However, the mediators and underlying molecular mechanisms that mediate these fasting-induced adaptive responses remain unclear. Materials and methods: Male wild-type C57BL/6J littermates (8-weeks-old) were intraperitoneally injected with MCC950 or vehicle, and then randomly divided into three groups: fed, fasted, and refed. Plasma IL1β and insulin levels were detected by ELISA kits. Plasma and hepatic metabolites were determined using commercial assay kits. HepaRG cell line was applied to verify the regulation of NLRP3 on lipogenesis. Results: NOD-like receptor protein 3 (NLRP3) and its downstream inflammatory cytokines were significantly suppressed after 24 h fasting and recovered upon 6 h refeeding in plasma and liver tissues of mice. Moreover, fasting-induced hepatic steatosis and accompanied liver injury were ameliorated when mice were intraperitoneally injected with MCC950 (a selective NLRP3 inhibitor). Further study revealed that MCC950 suppressed sterol regulatory element-binding protein-1c (SREBP-1c) expression and transcriptional activity, thus inhibited lipogenesis in the liver, which may explain its role in stabilizing lipid metabolism. Conclusion: The NLRP3 inhibitor-MCC950 protects against fasting-induced hepatic steatosis. The novel and critical role of NLRP3 in lipogenesis may explain its importance in regulating the adaptive responses of the liver upon starvation stress and may provide therapeutic value.
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Affiliation(s)
- Baoqing Liu
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Xiaoxiang Mao
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Clinic Center of Human Gene Research, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Dandan Huang
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Clinic Center of Human Gene Research, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Fei Li
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Correspondence: Fei Li; Nianguo Dong1277 Jiefang Ave, Wuhan, Hubei, 430000, People’s Republic of China Email ;
| | - Nianguo Dong
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
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Pei H, Han S, Yang S, Lei Z, Zheng J, Jia Z. Phosphorylation of bacterial L9 and its functional implication in response to starvation stress. FEBS Lett 2017; 591:3421-3430. [PMID: 28898405 DOI: 10.1002/1873-3468.12840] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 08/20/2017] [Accepted: 08/28/2017] [Indexed: 11/10/2022]
Abstract
The bacterial L9 (bL9) protein expressed and purified from Escherichia coli is stably phosphorylated. We mapped seven Ser/Thr phosphorylation sites, all of which but one are located at the carboxyl-terminal domain (CTD). When a histidine tag is fused to the C-terminus, bL9 is no longer phosphorylated. Phosphorylation of bL9 causes complete disordering of its CTD and helps cell survival under nutrient-limiting conditions. Previous structural studies of the ribosome have shown that bL9 exhibits two distinct conformations, one of which competes with binding of RelA to the 30s rRNA and prevents RelA activation. Taken together, we suggest that the flexibility of the bL9 CTD enabled by phosphorylation would remove the steric hindrance, serving as a previously unknown mechanism to regulate RelA function and help cell survival under starvation stress.
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Affiliation(s)
- Hairun Pei
- College of Chemistry, Beijing Normal University, China.,Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology & Business University, China
| | - Shengnan Han
- College of Chemistry, Beijing Normal University, China
| | - Shaoyuan Yang
- College of Chemistry, Beijing Normal University, China
| | - Zhen Lei
- College of Chemistry, Beijing Normal University, China
| | - Jimin Zheng
- College of Chemistry, Beijing Normal University, China
| | - Zongchao Jia
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Canada
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9
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Rueppell O, Kirkman RW. Extraordinary starvation resistance in Temnothorax rugatulus (Hymenoptera, Formicidae) colonies: Demography and adaptive behavior. Insectes Soc 2005; 52:282-290. [PMID: 18521192 PMCID: PMC2408869 DOI: 10.1007/s00040-005-0804-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ant colony mortality has not been sufficiently studied, even though it is crucial for understanding social insect population biology and can serve as an important model for general aging and mortality processes. Particularly, studies on proximate mechanisms on mortality and stress resistance of ant colonies are lacking. This study explores the long-term colony starvation resistance of the small myrmecine ant Temnothorax rugatulus. We report extraordinary starvation resistance in the 21 colonies investigated, as most survived the eight months of total starvation. Furthermore, we studied demographic and behavioral changes over the experimental period. Brood decline began first (after two months) and mortality was highest, worker decline was intermediate, and queen mortality started latest and remained lowest. We found brood (its relative change during the first four months and the level of brood relative to colony size) to be the only significant predictor of colony starvation resistance, but not the degree of polygyny. As expected, rates of trophallaxis increased during the starvation period while colony activity bouts occurred more frequently but were much shorter, leading to an overall decrease in activity levels. This study is the first to comprehensively study mechanisms of starvation resistance in ant colonies, linking demography and behavior.
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Affiliation(s)
- O Rueppell
- Department of Biology, University of North Carolina, Greensboro, 312 Eberhart Building, Greensboro, NC 27403, USA, e-mail:
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