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Lee DY, Arndt J, O’Connell JF, Egan JM, Kim Y. Red Ginseng Attenuates the Hepatic Cellular Senescence in Aged Mice. BIOLOGY 2024; 13:36. [PMID: 38248467 PMCID: PMC10813250 DOI: 10.3390/biology13010036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/27/2023] [Accepted: 01/06/2024] [Indexed: 01/23/2024]
Abstract
Cellular senescence is defined as an irreversible cell cycle arrest accompanied by morphological and physiological alterations during aging. Red ginseng (RG), processed from fresh ginseng (Panax ginseng C.A. Meyer) with a one-time steaming and drying process, is a well-known beneficial herbal medicine showing antioxidant, anti-inflammatory, and anti-aging properties. The current study aimed to investigate the benefits of RG in alleviating hepatic cellular senescence and its adverse effects in 19-month-old aged mice. We applied two different intervention methods and durations to compare RG's effects in a time-dependent manner: (1) oral gavage injection for 4 weeks and (2) ad libitum intervention for 14 weeks. We observed that 4-week RG administration was exerted to maintain insulin homeostasis against developing age-associated insulin insensitivity and suppressed cellular senescence pathway in the liver and primary hepatocytes. Moreover, with remarkable improvement of insulin homeostasis, 14-week RG supplementation downregulated the activation of c-Jun N-terminal kinase (JNK) and its downstream transcriptional factor nuclear factor-κB (NF-κB) in aged mice. Lastly, RG treatment significantly reduced the senescence-associated β-galactosidase (SA-β-gal)-positive cells in primary hepatocytes and ionizing radiation (IR)-exposed mouse embryonic fibroblasts (MEFs). Taken together, we suggest that RG can be a promising candidate for a senolytic substance by preventing hepatic cellular senescence.
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Affiliation(s)
- Da-Yeon Lee
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (D.-Y.L.); (J.A.)
| | - Juliana Arndt
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (D.-Y.L.); (J.A.)
| | - Jennifer F. O’Connell
- Laboratory of Clinical Investigation, National Institute on Aging, Baltimore, MD 21224, USA; (J.F.O.); (J.M.E.)
| | - Josephine M. Egan
- Laboratory of Clinical Investigation, National Institute on Aging, Baltimore, MD 21224, USA; (J.F.O.); (J.M.E.)
| | - Yoo Kim
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (D.-Y.L.); (J.A.)
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Li S, Wang J, Tian X, Toufeeq S, Huang W. Immunometabolic regulation during the presence of microorganisms and parasitoids in insects. Front Immunol 2023; 14:905467. [PMID: 37818375 PMCID: PMC10560992 DOI: 10.3389/fimmu.2023.905467] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 09/04/2023] [Indexed: 10/12/2023] Open
Abstract
Multicellular organisms live in environments containing diverse nutrients and a wide variety of microbial communities. On the one hand, the immune response of organisms can protect from the intrusion of exogenous microorganisms. On the other hand, the dynamic coordination of anabolism and catabolism of organisms is a necessary factor for growth and reproduction. Since the production of an immune response is an energy-intensive process, the activation of immune cells is accompanied by metabolic transformations that enable the rapid production of ATP and new biomolecules. In insects, the coordination of immunity and metabolism is the basis for insects to cope with environmental challenges and ensure normal growth, development and reproduction. During the activation of insect immune tissues by pathogenic microorganisms, not only the utilization of organic resources can be enhanced, but also the activated immune cells can usurp the nutrients of non-immune tissues by generating signals. At the same time, insects also have symbiotic bacteria in their body, which can affect insect physiology through immune-metabolic regulation. This paper reviews the research progress of insect immune-metabolism regulation from the perspective of insect tissues, such as fat body, gut and hemocytes. The effects of microorganisms (pathogenic bacteria/non-pathogenic bacteria) and parasitoids on immune-metabolism were elaborated here, which provide guidance to uncover immunometabolism mechanisms in insects and mammals. This work also provides insights to utilize immune-metabolism for the formulation of pest control strategies.
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Affiliation(s)
- Shirong Li
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- College of Life Sciences, Yan’an University, Yan’an, Shaanxi, China
| | - Jing Wang
- College of Life Sciences, Shangrao Normal University, Shangrao, China
| | - Xing Tian
- College of Life Sciences, Yan’an University, Yan’an, Shaanxi, China
| | - Shahzad Toufeeq
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Wuren Huang
- Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
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Nadel G, Maik-Rachline G, Seger R. JNK Cascade-Induced Apoptosis-A Unique Role in GqPCR Signaling. Int J Mol Sci 2023; 24:13527. [PMID: 37686335 PMCID: PMC10487481 DOI: 10.3390/ijms241713527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/27/2023] [Accepted: 08/28/2023] [Indexed: 09/10/2023] Open
Abstract
The response of cells to extracellular signals is mediated by a variety of intracellular signaling pathways that determine stimulus-dependent cell fates. One such pathway is the cJun-N-terminal Kinase (JNK) cascade, which is mainly involved in stress-related processes. The cascade transmits its signals via a sequential activation of protein kinases, organized into three to five tiers. Proper regulation is essential for securing a proper cell fate after stimulation, and the mechanisms that regulate this cascade may involve the following: (1) Activatory or inhibitory phosphorylations, which induce or abolish signal transmission. (2) Regulatory dephosphorylation by various phosphatases. (3) Scaffold proteins that bring distinct components of the cascade in close proximity to each other. (4) Dynamic change of subcellular localization of the cascade's components. (5) Degradation of some of the components. In this review, we cover these regulatory mechanisms and emphasize the mechanism by which the JNK cascade transmits apoptotic signals. We also describe the newly discovered PP2A switch, which is an important mechanism for JNK activation that induces apoptosis downstream of the Gq protein coupled receptors. Since the JNK cascade is involved in many cellular processes that determine cell fate, addressing its regulatory mechanisms might reveal new ways to treat JNK-dependent pathologies.
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Affiliation(s)
| | | | - Rony Seger
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot 7610001, Israel; (G.N.); (G.M.-R.)
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Jin L, Wang M, Yang B, Ye L, Zhu W, Zhang Q, Lou S, Zhang Y, Luo W, Liang G. A small-molecule JNK inhibitor JM-2 attenuates high-fat diet-induced non-alcoholic fatty liver disease in mice. Int Immunopharmacol 2023; 115:109587. [PMID: 36565558 DOI: 10.1016/j.intimp.2022.109587] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 11/29/2022] [Accepted: 12/09/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND The prevalence of non-alcoholic fatty liver disease (NAFLD) has been deemed a leading cause of end-stage liver disease. As a member of the mitogen-activated protein kinase family, c-Jun N-terminal kinase (JNK) has been shown to play an important role in the pathogenesis of NAFLD. Here, we identified a novel JNK inhibitor, JM-2, and evaluated its therapeutic effects against NAFLD both in vitro and in vivo. METHODS In vitro, JNK was blocked by JM-2 in PA-challenged hepatocytes. C57BL/6 mice were fed a high-fat diet for 6 months to develop NAFLD. Mice were treated with JM-2 by intragastric administration. RESULTS In primary hepatocytes and AML-12 cells, JM-2 treatment significantly suppressed palmitic acid (PA)-induced JNK activation and PA-induced inflammation and cell apoptosis. In addition, JM-2 restricted the production of fibrosis- and lipid metabolism-related genes in PA-challenged hepatocytes. We evaluated the curative effect of JM-2 against NAFLD using a high-fat diet (HFD)-fed mouse model. Based on our findings, JM-2 administration significantly protected the mouse liver from HFD-induced inflammation, lipid accumulation, fibrosis, and apoptosis, accompanied with reduced JNK phosphorylation in the liver tissue. CONCLUSION JM-2 affords a significant protective effect against HFD-induced NAFLD by inhibiting JNK activation and is potential to be developed as a candidate drug for NAFLD treatment.
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Affiliation(s)
- Leiming Jin
- Department of Cardiology and Medical Research Center, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Minxiu Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Bin Yang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Lin Ye
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Weiwei Zhu
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Qianhui Zhang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Shuaijie Lou
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Yi Zhang
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China
| | - Wu Luo
- Department of Cardiology and Medical Research Center, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Guang Liang
- Department of Cardiology and Medical Research Center, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325035, China; School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China.
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Yang W, Xia W, Zheng B, Li T, Liu RH. DAF-16 is involved in colonic metabolites of ferulic acid-promoted longevity and stress resistance of Caenorhabditis elegans. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:7017-7029. [PMID: 35689482 DOI: 10.1002/jsfa.12063] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/11/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Ferulic acid (FA) is a dietary polyphenol widely found in plant tissues. It has long been considered to have health-promoting qualities. However, the biological properties of dietary polyphenols depend largely on their absorption during digestion, and the effects of their intestinal metabolites on human health have attracted the interest of researchers. This study evaluated the effects of three main colonic metabolites of FA - 3-(3,4-dihydroxyphenyl)propionic acid (3,4diOHPPA), 3-(3-hydroxyphenyl)propionic acid (3OHPPA) and 3-phenylpropionic acid (3PPA) - on longevity and stress resistance in Caenorhabditis elegans. RESULTS Our results showed that 3,4diOHPPA, 3OHPPA and 3PPA extended the lifespan under normal conditions in C. elegans whereas FA did not. High doses of 3,4diOHPPA (0.5 mmol L-1 ), 3OHPPA (2.5 mmol L-1 ) and 3PPA (2.5 mmol L-1 ) prolonged the mean lifespan by 11.2%, 13.0% and 10.6%, respectively. Moreover, 3,4diOHPPA, 3OHPPA and 3PPA treatments promoted stress tolerance against heat, UV irradiation and paraquat. Furthermore, three metabolites ameliorated physical functions, including reactive oxygen species and malondialdehyde levels, motility and pharyngeal pumping rate. The anti-aging activities mediated by 3,4diOHPPA, 3OHPPA and 3PPA depend on the HSF-1 and JNK-1 linked insulin/IGF-1 signaling pathway, which converge onto DAF-16. CONCLUSION The current findings suggest that colonic metabolites of FA have the potential for use as anti-aging bioactivate compounds. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Wenhan Yang
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), School of Food Science and Engineering, South China University of Technology, Guangzhou, China
| | - Wen Xia
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), School of Food Science and Engineering, South China University of Technology, Guangzhou, China
| | - Bisheng Zheng
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong ERA Food and Life Health Research Institute, Guangzhou, China
| | - Tong Li
- Department of Food Science, Cornell University, Ithaca, New York, USA
| | - Rui Hai Liu
- Department of Food Science, Cornell University, Ithaca, New York, USA
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Hameed A, Galli M, Adamska-Patruno E, Krętowski A, Ciborowski M. Select Polyphenol-Rich Berry Consumption to Defer or Deter Diabetes and Diabetes-Related Complications. Nutrients 2020; 12:E2538. [PMID: 32825710 PMCID: PMC7551116 DOI: 10.3390/nu12092538] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 08/11/2020] [Accepted: 08/11/2020] [Indexed: 12/20/2022] Open
Abstract
Berries are considered "promising functional fruits" due to their distinct and ubiquitous therapeutic contents of anthocyanins, proanthocyanidins, phenolic acids, flavonoids, flavanols, alkaloids, polysaccharides, hydroxycinnamic, ellagic acid derivatives, and organic acids. These polyphenols are part of berries and the human diet, and evidence suggests that their intake is associated with a reduced risk or the reversal of metabolic pathophysiologies related to diabetes, obesity, oxidative stress, inflammation, and hypertension. This work reviewed and summarized both clinical and non-clinical findings that the consumption of berries, berry extracts, purified compounds, juices, jams, jellies, and other berry byproducts aided in the prevention and or otherwise management of type 2 diabetes mellitus (T2DM) and related complications. The integration of berries and berries-derived byproducts into high-carbohydrate (HCD) and high-fat (HFD) diets, also reversed/reduced the HCD/HFD-induced alterations in glucose metabolism-related pathways, and markers of oxidative stress, inflammation, and lipid oxidation in healthy/obese/diabetic subjects. The berry polyphenols also modulate the intestinal microflora ecology by opposing the diabetic and obesity rendered symbolic reduction of Bacteroidetes/Firmicutes ratio, intestinal mucosal barrier dysfunction-restoring bacteria, short-chain fatty acids, and organic acid producing microflora. All studies proposed a number of potential mechanisms of action of respective berry bioactive compounds, although further mechanistic and molecular studies are warranted. The metabolic profiling of each berry is also included to provide up-to-date information regarding the potential anti-oxidative/antidiabetic constituents of each berry.
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Affiliation(s)
- Ahsan Hameed
- Clinical Research Center, Medical University of Bialystok, 15-089 Bialystok, Poland; (A.H.); (E.A.-P.); (A.K.)
| | - Mauro Galli
- Department of Medical Biology, Medical University of Bialystok, 15-222 Bialystok, Poland;
| | - Edyta Adamska-Patruno
- Clinical Research Center, Medical University of Bialystok, 15-089 Bialystok, Poland; (A.H.); (E.A.-P.); (A.K.)
| | - Adam Krętowski
- Clinical Research Center, Medical University of Bialystok, 15-089 Bialystok, Poland; (A.H.); (E.A.-P.); (A.K.)
- Department of Endocrinology, Diabetology, and Internal Medicine, Medical University of Bialystok, 15-089 Bialystok, Poland
| | - Michal Ciborowski
- Clinical Research Center, Medical University of Bialystok, 15-089 Bialystok, Poland; (A.H.); (E.A.-P.); (A.K.)
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Wang L, Chen H, Wang L, Song L. An insulin-like peptide serves as a regulator of glucose metabolism in the immune response of Chinese mitten crab Eriocheir sinensis. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 108:103686. [PMID: 32205179 DOI: 10.1016/j.dci.2020.103686] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
A robust immune response against invading pathogens greatly depends on the balance of metabolism, which could be vigorously modulated by insulin/IGF signaling (IIS) pathway in vertebrates. However, knowledge on the IIS pathway, especially the function of insulin-like peptides (ILPs) in invertebrates remained largely unknown. In the present study, a novel ILP was identified from Eriocheir sinensisis (designated EsILP). The coding sequence of EsILP was of 216 bp, which encoded a polypeptide of 71 amino acids containing an IlGF-like domain with four conserved cysteine residues. The mRNA transcripts of EsILP were found to be expressed dominantly in eyestalks and hepatopancreas, and EsILP protein was found to be distributed in the anterior median area of thoracic ganglion mass and the edges of hepatic tubules correspondingly. After Aeromonas hydrophila stimulation, EsILP transcripts were significantly increased at 3, 12 and 24 h post-stimulation in eyestalks and 6 and 48 h in hemocytes, respectively. In contrast, the expression level of EsILP decreased significantly in hepatopancreas from 6 h to 12 h after the stimulation. The glucose level in the hemolymph of crabs was significantly decreased from 6 to 12 h after the injection of recombinant EsILP. These results collectively demonstrated that the ancient ILP protein in E. sinensisis could negatively regulate glucose metabolism and participate in the immune response of the crabs against pathogen infection, which provided clues for the further investigation about the evolution and function of the IIS pathway in invertebrates.
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Affiliation(s)
- Lin Wang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Hao Chen
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Lingling Wang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Linsheng Song
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China.
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Zhang H, Zhang W, Yun D, Li L, Zhao W, Li Y, Liu X, Liu Z. Alternate-day fasting alleviates diabetes-induced glycolipid metabolism disorders: roles of FGF21 and bile acids. J Nutr Biochem 2020; 83:108403. [PMID: 32497958 DOI: 10.1016/j.jnutbio.2020.108403] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/27/2020] [Accepted: 04/23/2020] [Indexed: 12/28/2022]
Abstract
Glycolipid metabolism disorder is one of the causes of type 2 diabetes (T2D). Alternate-day fasting (ADF) is an effective dietary intervention to counteract T2D. The present study is aimed to determine the underlying mechanisms of the benefits of ADF metabolic on diabetes-induced glycolipid metabolism disorders in db/db mice. Here, leptin receptor knock-out diabetic mice were subjected to 28 days of isocaloric ADF. We found that ADF prevented insulin resistance and bodyweight gain in diabetic mice. ADF promoted glycogen synthesis in both liver and muscle. ADF also activated recombinant insulin receptor substrate-1 (IRS-1)/protein kinase B (AKT/PKB) signaling,inactivated inflammation related AMP-activated protein kinase (AMPK) and the inflammation-regulating nuclear factor kappa-B (NF-κB) signaling in the liver. ADF also suppressed lipid accumulation by inactivating the expression of peroxisome proliferator-activated receptor gamma (PPAR-γ) and sterol regulatory element-binding protein-1c (SREBP-1c). Furthermore, ADF elevated the expression of fibroblast growth factor 21 (FGF21) and down-stream signaling AMPK/silent mating type information regulation 2 homolog 1 (SIRT1)/peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α) in the liver of diabetic mice. The mitochondrial biogenesis and autophagy were also stimulated by ADF. Interestingly, ADF also enhanced the bile acids (BAs) metabolism by generating more cholic acid (CA), deoxycholic acid (DCA) and tauroursodeoxycholic acid (TUDCA) in db/db mice. In conclusion, ADF could significantly inhibit T2D induced insulin resistance and obesity, promote insulin signaling,reduce inflammation, as well as promote glycogen synthesis and lipid metabolism. It possibly depends on FGF21 and BA metabolism to enhance mitochondrial biosynthesis and energy metabolism.
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Affiliation(s)
- Hongbo Zhang
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Wentong Zhang
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Duo Yun
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Ling Li
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Weiyang Zhao
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, USA
| | - Yitong Li
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, USA
| | - Xuebo Liu
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China.
| | - Zhigang Liu
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling, China; Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, USA.
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Zhuang J, Song Y, Ye Y, He S, Ma X, Zhang M, Ni J, Wang J, Xia W. PYCR1 interference inhibits cell growth and survival via c-Jun N-terminal kinase/insulin receptor substrate 1 (JNK/IRS1) pathway in hepatocellular cancer. J Transl Med 2019; 17:343. [PMID: 31619254 PMCID: PMC6796468 DOI: 10.1186/s12967-019-2091-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 10/05/2019] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Liver cancer is the second leading causes of cancer-related death globally. Pyrroline-5-carboxylate reductase 1 (PYCR1) plays a critical role in metabolic profiles of tumors. Therefore, it is necessary to explore the mechanisms of PYCR1 on cell growth and survival in hepatocellular carcinoma (HCC). METHODS Protein and mRNA expression levels of PYCR1 in 140 pairs of tumor and adjacent normal liver tissues of HCC patients were analyzed by immunohistochemistry and quantitative real-time polymerase chain reaction (qRT-PCR). Expressions of PYCR1 were inhibited in BEL-7404 cells and SMMC-7721 cells using gene interference technology. The cell proliferation was detected by Celigo and MTT assay. The colony formation assay was also performed. The cell apoptosis was measured by flow cytometric assay. The effect of PYCR1 interference on tumor growth was observed by xenograft nude mice assay in vivo. The downstream pathway of PYCR1 interference was searched by microarray and bioinformatics analysis, and validated by qRT-PCR and western blot. RESULTS PYCR1 levels were significantly up-regulated in HCC tumor tissues than adjacent normal liver tissues in both protein and mRNA levels (P < 0.01). In vitro, the cell proliferation was significantly slower in shPYCR1 group than shCtrl group in BEL-7404 and SMMC-7721 cells (P < 0.001). The colony number was significantly smaller after PYCR1 interference (P < 0.01). The percentage of apoptosis cells significantly increased in shPYCR1 group (P < 0.01). In vivo, PYCR1 interference could obviously suppress tumor growth in xenograft nude mice. The volume and weight of tumors were significantly smaller via PYCR1 interference. The c-Jun N-terminal kinase (JNK) signaling pathway significantly altered, and insulin receptor substrate 1 (IRS1) were significantly down-regulated by PYCR1 interference in both mRNA and protein levels (P < 0.001). CONCLUSION PYCR1 interference could inhibit cell proliferation and promote cell apoptosis in HCC through regluting JNK/IRS1 pathway. Our study will provide a drug target for HCC therapy and a potential biomarker for its diagnosis or prognosis.
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Affiliation(s)
- Juhua Zhuang
- Department of Nuclear Medicine, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Yanan Song
- Central Laboratory, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Ying Ye
- Central Laboratory, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Saifei He
- Central Laboratory, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Xing Ma
- Department of Nuclear Medicine, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Miao Zhang
- Central Laboratory, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Jing Ni
- Department of Nuclear Medicine, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China
| | - Jiening Wang
- Central Laboratory, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China.
| | - Wei Xia
- Department of Nuclear Medicine, The Seventh People's Hospital of Shanghai University of Traditional Chinese Medicine, 358 Datong Road, Pudong, Shanghai, 200137, People's Republic of China.
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Zhang C, Tan Z, Xie Y, Zhao Y, Huang TY, Lu Z, Luo H, Can D, Xu H, Zhang YW, Zhang X. Appoptosin Mediates Lesions Induced by Oxidative Stress Through the JNK-FoxO1 Pathway. Front Aging Neurosci 2019; 11:243. [PMID: 31551758 PMCID: PMC6737070 DOI: 10.3389/fnagi.2019.00243] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 08/20/2019] [Indexed: 01/07/2023] Open
Abstract
Oxidative stress is a common feature of neurodegenerative diseases and plays an important role in disease progression. Appoptosin is a pro-apoptotic protein that contributes to the pathogenesis of neurodegenerative diseases such as Alzheimer's disease and progressive supranuclear palsy. However, whether appoptosin mediates oxidative stress-induced neurotoxicity has yet to be determined. Here, we observe that appoptosin protein levels are induced by hydrogen peroxide (H2O2) exposure through the inhibition of proteasomal appoptosin degradation. Furthermore, we demonstrate that overexpression of appoptosin induces apoptosis through the JNK-FoxO1 pathway. Importantly, knockdown of appoptosin can ameliorate H2O2-induced JNK activation and apoptosis in primary neurons. Thus, we propose that appoptosin functions as an upstream regulator of the JNK-FoxO1 pathway, contributing to cell death in response to oxidative stress during neurodegeneration.
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Affiliation(s)
- Cuilin Zhang
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China.,The United Innovation of Mengchao Hepatobiliary Technology Key Laboratory of Fujian Province, Mengchao Hepatobiliary Hospital of Fujian Medical University, Fuzhou, China
| | - Zhenqiu Tan
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Yongzhuang Xie
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Yingjun Zhao
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Timothy Y Huang
- Neuroscience Initiative, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Zhaoping Lu
- Fujian Provincial Maternity and Children's Hospital of Fujian Medical University, Fuzhou, China
| | - Hong Luo
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Dan Can
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Huaxi Xu
- Neuroscience Initiative, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Yun-Wu Zhang
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
| | - Xian Zhang
- Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, School of Pharmaceutical Sciences, School of Medicine, Institute of Neuroscience, Xiamen University, Xiamen, China
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11
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Wang L, Davis SS, Borch Jensen M, Rodriguez‐Fernandez IA, Apaydin C, Juhasz G, Gibson BW, Schilling B, Ramanathan A, Ghaemmaghami S, Jasper H. JNK modifies neuronal metabolism to promote proteostasis and longevity. Aging Cell 2019; 18:e12849. [PMID: 30810280 PMCID: PMC6516429 DOI: 10.1111/acel.12849] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 08/18/2018] [Accepted: 09/03/2018] [Indexed: 12/13/2022] Open
Abstract
Aging is associated with a progressive loss of tissue and metabolic homeostasis. This loss can be delayed by single-gene perturbations, increasing lifespan. How such perturbations affect metabolic and proteostatic networks to extend lifespan remains unclear. Here, we address this question by comprehensively characterizing age-related changes in protein turnover rates in the Drosophila brain, as well as changes in the neuronal metabolome, transcriptome, and carbon flux in long-lived animals with elevated Jun-N-terminal Kinase signaling. We find that these animals exhibit a delayed age-related decline in protein turnover rates, as well as decreased steady-state neuronal glucose-6-phosphate levels and elevated carbon flux into the pentose phosphate pathway due to the induction of glucose-6-phosphate dehydrogenase (G6PD). Over-expressing G6PD in neurons is sufficient to phenocopy these metabolic and proteostatic changes, as well as extend lifespan. Our study identifies a link between metabolic changes and improved proteostasis in neurons that contributes to the lifespan extension in long-lived mutants.
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Affiliation(s)
- Lifen Wang
- The Buck Institute for Research on AgingNovatoCalifornia
- Genentech Inc.South San FranciscoCalifornia
| | | | | | | | - Cagsar Apaydin
- The Buck Institute for Research on AgingNovatoCalifornia
| | - Gabor Juhasz
- Department of Anatomy, Cell and Developmental BiologyEotvos Lorand UniversityBudapestHungary
- Institute of GeneticsBiological Research Center of the Hungarian Academy of SciencesSzegedHungary
| | | | | | | | | | - Heinrich Jasper
- The Buck Institute for Research on AgingNovatoCalifornia
- Genentech Inc.South San FranciscoCalifornia
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12
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Chen D, Gong Y, Xu L, Zhou M, Li J, Song J. Bidirectional regulation of osteogenic differentiation by the FOXO subfamily of Forkhead transcription factors in mammalian MSCs. Cell Prolif 2018; 52:e12540. [PMID: 30397974 PMCID: PMC6496202 DOI: 10.1111/cpr.12540] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/09/2018] [Accepted: 09/02/2018] [Indexed: 12/23/2022] Open
Abstract
Through loss‐ and gain‐of‐function experiments in knockout and transgenic mice, Forkhead box O (FOXO) family transcription factors have been demonstrated to play essential roles in many biological processes, including cellular proliferation, apoptosis and differentiation. Osteogenic differentiation from mesenchymal stem cells (MSCs) into osteoblasts is a well‐organized process that is carefully guided and characterized by various factors, such as runt‐related transcription factor 2 (Runx2), β‐catenin, osteocalcin (OCN), alkaline phosphatase (ALP) and activating transcription factor 4 (ATF4). Accumulating evidence suggests multiple interactions among FOXO members and the differentiation regulatory factors listed above, resulting in an enhancement or inhibition of osteogenesis in different stages of osteogenic differentiation. To systematically and integrally understand the role of FOXOs in osteogenic differentiation and explain the contrary phenomena observed in vitro and in vivo, we herein summarized FOXO‐interacting differentiation regulatory genes/factors and following alterations in differentiation. The underlying mechanism was further discussed on the basis of binding types, sites, phases and the consequent downstream transcriptional alterations of interactions among FOXOs and differentiation regulatory factors. Interestingly, a bidirectional effect of FOXOs on balancing osteogenic differentiation was discovered in MSCs. Moreover, FOXO factors are reported to be activated or suppressed by several context‐dependent signalling inputs during differentiation, and the underlying molecular basis may offer new drug development targets for treatments of bone formation defect diseases.
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Affiliation(s)
- Duanjing Chen
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Yuanyuan Gong
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Ling Xu
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Mengjiao Zhou
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Jie Li
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Jinlin Song
- College of Stomatology, Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
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13
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Lidzbarsky G, Gutman D, Shekhidem HA, Sharvit L, Atzmon G. Genomic Instabilities, Cellular Senescence, and Aging: In Vitro, In Vivo and Aging-Like Human Syndromes. Front Med (Lausanne) 2018; 5:104. [PMID: 29719834 PMCID: PMC5913290 DOI: 10.3389/fmed.2018.00104] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 03/29/2018] [Indexed: 12/20/2022] Open
Abstract
As average life span and elderly people prevalence in the western world population is gradually increasing, the incidence of age-related diseases such as cancer, heart diseases, diabetes, and dementia is increasing, bearing social and economic consequences worldwide. Understanding the molecular basis of aging-related processes can help extend the organism’s health span, i.e., the life period in which the organism is free of chronic diseases or decrease in basic body functions. During the last few decades, immense progress was made in the understanding of major components of aging and healthy aging biology, including genomic instability, telomere attrition, epigenetic changes, proteostasis, nutrient sensing, mitochondrial dysfunction, cellular senescence, stem cell exhaustion, and intracellular communications. This progress has been made by three spear-headed strategies: in vitro (cell and tissue culture from various sources), in vivo (includes diverse model and non-model organisms), both can be manipulated and translated to human biology, and the study of aging-like human syndromes and human populations. Herein, we will focus on current repository of genomic “senescence” stage of aging, which includes health decline, structural changes of the genome, faulty DNA damage response and DNA damage, telomere shortening, and epigenetic alterations. Although aging is a complex process, many of the “hallmarks” of aging are directly related to DNA structure and function. This review will illustrate the variety of these studies, done in in vitro, in vivo and human levels, and highlight the unique potential and contribution of each research level and eventually the link between them.
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Affiliation(s)
| | - Danielle Gutman
- Department of Human Biology, University of Haifa, Haifa, Israel
| | | | - Lital Sharvit
- Department of Human Biology, University of Haifa, Haifa, Israel
| | - Gil Atzmon
- Department of Human Biology, University of Haifa, Haifa, Israel
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14
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Gruntenko NE, Rauschenbach IY. The role of insulin signalling in the endocrine stress response in Drosophila melanogaster: A mini-review. Gen Comp Endocrinol 2018; 258:134-139. [PMID: 28554733 DOI: 10.1016/j.ygcen.2017.05.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/15/2017] [Accepted: 05/24/2017] [Indexed: 12/22/2022]
Abstract
The endocrine stress response in Drosophila includes catecholamines, juvenile hormone (JH), 20-hydroxyecdysone (20E) and the insulin/insulin-like growth factor signalling pathway (IIS). Several changes in the IIS and hormonal status that occur under unfavourable conditions are universal and do not depend on the nature of stress exposure. The reviewed studies on the impact of different element of the Drosophila IIS, such as insulin-like receptor, the homologue of its substrate, CHICO, the transcription factor dFOXO and insulin like peptide 6, on the hormonal status suggest that the IIS controls catecholamine metabolism indirectly via JH, and there is a feedback loop in the interaction of JH and IIS. Moreover, at least one of the ways in which the IIS is involved in the control of stress resistance is mediated through JH/dopamine signalling.
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Affiliation(s)
- N E Gruntenko
- Institute of Cytology and Genetics SB RAS, Novosibirsk 630090, Russia.
| | - I Yu Rauschenbach
- Institute of Cytology and Genetics SB RAS, Novosibirsk 630090, Russia
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15
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Liu L, Fang C, Yang J, Zhang H, Huang Y, Xuan C, Wang Y, Li S, Sha J, Zha M, Guo M. The effect of noise exposure on insulin sensitivity in mice may be mediated by the JNK/IRS1 pathway. Environ Health Prev Med 2018; 23:6. [PMID: 29433422 PMCID: PMC5809884 DOI: 10.1186/s12199-018-0694-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 01/29/2018] [Indexed: 01/07/2023] Open
Abstract
Background Epidemiological studies have suggested that noise exposure may increase the risk of type 2 diabetes mellitus (T2DM), and experimental studies have demonstrated that noise exposure can induce insulin resistance in rodents. The aim of the present study was to explore noise-induced processes underlying impaired insulin sensitivity in mice. Methods Male ICR mice were randomly divided into four groups: a control group without noise exposure and three noise groups exposed to white noise at a 95-dB sound pressure level for 4 h/day for 1, 10, or 20 days (N1D, N10D, and N20D, respectively). Systemic insulin sensitivity was evaluated at 1 day, 1 week, and 1 month post-noise exposure (1DPN, 1WPN, and 1MPN) via insulin tolerance tests (ITTs). Several insulin-related processes, including the phosphorylation of Akt, IRS1, and JNK in the animals’ skeletal muscles, were examined using standard immunoblots. Biomarkers of inflammation (circulating levels of TNF-α and IL-6) and oxidative stress (SOD and CAT activities and MDA levels in skeletal muscles) were measured via chemical analyses. Results The data obtained in this study showed the following: (1) The impairment of systemic insulin sensitivity was transient in the N1D group but prolonged in the N10D and N20D groups. (2) Noise exposure led to enhanced JNK phosphorylation and IRS1 serine phosphorylation as well as reduced Akt phosphorylation in skeletal muscles in response to exogenous insulin stimulation. (3) Plasma levels of TNF-α and IL-6, CAT activity, and MDA concentrations in skeletal muscles were elevated after 20 days of noise exposure. Conclusions Impaired insulin sensitivity in noise-exposed mice might be mediated by an enhancement of the JNK/IRS1 pathway. Inflammation and oxidative stress might contribute to insulin resistance after chronic noise exposure.
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Affiliation(s)
- Lijie Liu
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China.
| | - Cong Fang
- Institute of Life Sciences, Southeast University, Nanjing, China
| | - Jing Yang
- Institute of Life Sciences, Southeast University, Nanjing, China
| | - Hongyu Zhang
- Institute of Life Sciences, Southeast University, Nanjing, China
| | - Yi Huang
- Institute of Life Sciences, Southeast University, Nanjing, China
| | - Chuanying Xuan
- Institute of Life Sciences, Southeast University, Nanjing, China
| | - Yongfang Wang
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China
| | - Shengwei Li
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China
| | - Jun Sha
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China
| | - Mingming Zha
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China
| | - Min Guo
- Medical College, Southeast University, No.87, Dingjiaqiao Street, Gulou, Nanjing, China
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16
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Gruntenko NЕ, Ilinsky YY, Adonyeva NV, Burdina EV, Bykov RA, Menshanov PN, Rauschenbach IY. Various Wolbachia genotypes differently influence host Drosophila dopamine metabolism and survival under heat stress conditions. BMC Evol Biol 2017; 17:252. [PMID: 29297293 PMCID: PMC5751659 DOI: 10.1186/s12862-017-1104-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND One of the most widespread prokaryotic symbionts of invertebrates is the intracellular bacteria of Wolbachia genus which can be found in about 50% of insect species. Wolbachia causes both parasitic and mutualistic effects on its host that include manipulating the host reproductive systems in order to increase their transmission through the female germline, and increasing the host fitness. One of the mechanisms, promoting adaptation in biological organisms, is a non-specific neuroendocrine stress reaction. In insects, this reaction includes catecholamines, dopamine, serotonin and octopamine, which act as neurotransmitters, neuromodulators and neurohormones. The level of dopamine metabolism correlates with heat stress resistance in Drosophila adults. RESULTS To examine Wolbachia effect on Drosophila survival under heat stress and dopamine metabolism we used five strains carrying the nuclear background of interbred Bi90 strain and cytoplasmic backgrounds with different genotype variants of Wolbachia (produced by 20 backcrosses of Bi90 males with appropriate source of Wolbachia). Non-infected Bi90 strain (treated with tetracycline for 3 generations) was used as a control group. We demonstrated that two of five investigated Wolbachia variants promote changes in Drosophila heat stress resistance and activity of enzymes that produce and degrade dopamine, alkaline phosphatase and dopamine-dependent arylalkylamine N-acetyltransferase. What is especially interesting, wMelCS genotype of Wolbachia increases stress resistance and the intensity of dopamine metabolism, whereas wMelPop strain decreases them. wMel, wMel2 and wMel4 genotypes of Wolbachia do not show any effect on the survival under heat stress or dopamine metabolism. L-DOPA treatment, known to increase the dopamine content in Drosophila, levels the difference in survival under heat stress between all studied groups. CONCLUSIONS The genotype of symbiont determines the effect that the symbiont has on the stress resistance of the host insect.
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Affiliation(s)
- Nataly Е Gruntenko
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia.
| | - Yury Yu Ilinsky
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia
- Novosibirsk State University, Novosibirsk, Russia
- School of Life Sciences Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Natalya V Adonyeva
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia
| | - Elena V Burdina
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia
| | - Roman A Bykov
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia
| | - Petr N Menshanov
- The Institute of Cytology and Genetics of SB RAS, Novosibirsk, 630090, Russia
- Novosibirsk State University, Novosibirsk, Russia
- Novosibirsk State Technical University, Novosibirsk, Russia
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17
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Kubrak OI, Lushchak OV, Zandawala M, Nässel DR. Systemic corazonin signalling modulates stress responses and metabolism in Drosophila. Open Biol 2017; 6:rsob.160152. [PMID: 27810969 PMCID: PMC5133436 DOI: 10.1098/rsob.160152] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 10/05/2016] [Indexed: 12/20/2022] Open
Abstract
Stress triggers cellular and systemic reactions in organisms to restore homeostasis. For instance, metabolic stress, experienced during starvation, elicits a hormonal response that reallocates resources to enable food search and readjustment of physiology. Mammalian gonadotropin-releasing hormone (GnRH) and its insect orthologue, adipokinetic hormone (AKH), are known for their roles in modulating stress-related behaviour. Here we show that corazonin (Crz), a peptide homologous to AKH/GnRH, also alters stress physiology in Drosophila. The Crz receptor (CrzR) is expressed in salivary glands and adipocytes of the liver-like fat body, and CrzR knockdown targeted simultaneously to both these tissues increases the fly's resistance to starvation, desiccation and oxidative stress, reduces feeding, alters expression of transcripts of Drosophila insulin-like peptides (DILPs), and affects gene expression in the fat body. Furthermore, in starved flies, CrzR-knockdown increases circulating and stored carbohydrates. Thus, our findings indicate that elevated systemic Crz signalling during stress coordinates increased food intake and diminished energy stores to regain metabolic homeostasis. Our study suggests that an ancient stress-peptide in Urbilateria evolved to give rise to present-day GnRH, AKH and Crz signalling systems.
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Affiliation(s)
- Olga I Kubrak
- Department of Zoology, Stockholm University, 10691 Stockholm, Sweden
| | - Oleh V Lushchak
- Department of Zoology, Stockholm University, 10691 Stockholm, Sweden
| | - Meet Zandawala
- Department of Zoology, Stockholm University, 10691 Stockholm, Sweden
| | - Dick R Nässel
- Department of Zoology, Stockholm University, 10691 Stockholm, Sweden
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18
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Mathew R, Pal Bhadra M, Bhadra U. Insulin/insulin-like growth factor-1 signalling (IIS) based regulation of lifespan across species. Biogerontology 2017; 18:35-53. [DOI: 10.1007/s10522-016-9670-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 11/25/2016] [Indexed: 12/21/2022]
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19
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Liu Z, Sun Y, Qiao Q, Zhao T, Zhang W, Ren B, Liu Q, Liu X. Sesamol ameliorates high-fat and high-fructose induced cognitive defects via improving insulin signaling disruption in the central nervous system. Food Funct 2017; 8:710-719. [DOI: 10.1039/c6fo01562j] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The present study demonstrated that sesamol prevents high-fat and high-fructose diet induced systemic insulin resistance and cognitive defects via stimulating PI3K/Akt signaling, improving ERK/CREB/BDNF cascades, and preserving mitochondrial function.
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Affiliation(s)
- Zhigang Liu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Yali Sun
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Qinglian Qiao
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Tong Zhao
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Wentong Zhang
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Bo Ren
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Qian Liu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
| | - Xuebo Liu
- Laboratory of Functional Chemistry and Nutrition of Food
- College of Food Science and Engineering
- Northwest A&F University
- Yangling
- China
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20
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Houssin NS, Bharathan NK, Turner SD, Dickinson AJG. Role of JNK during buccopharyngeal membrane perforation, the last step of embryonic mouth formation. Dev Dyn 2016; 246:100-115. [PMID: 28032936 DOI: 10.1002/dvdy.24470] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 09/23/2016] [Accepted: 10/31/2016] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The buccopharyngeal membrane is a thin layer of cells covering the embryonic mouth. The perforation of this structure creates an opening connecting the external and the digestive tube which is essential for oral cavity formation. In humans, persistence of the buccopharyngeal membrane can lead to orofacial defects such as choanal atresia, oral synechiaes, and cleft palate. Little is known about the causes of a persistent buccopharyngeal membrane and, importantly, how this structure ruptures. RESULTS We have determined, using antisense and pharmacological approaches, that Xenopus embryos deficient c-Jun N-terminal kinase (JNK) signaling have a persistent buccopharyngeal membrane. JNK deficient embryos have decreased cell division and increased cellular stress and apoptosis. However, altering these processes independently of JNK did not affect buccopharyngeal membrane perforation. JNK deficient embryos also have increased intercellular adhesion and defects in e-cadherin localization. Conversely, embryos with overactive JNK have epidermal fragility, increased E-cadherin internalization, and increased membrane localized clathrin. In the buccopharyngeal membrane, clathrin is colocalized with active JNK. Furthermore, inhibition of endocytosis results in a persistent buccopharyngeal membrane, mimicking the JNK deficient phenotype. CONCLUSIONS The results of this study suggest that JNK has a role in the disassembly adherens junctions by means of endocytosis that is required during buccopharyngeal membrane perforation. Developmental Dynamics 246:100-115, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Nathalie S Houssin
- Department of Biology, Virginia Commonwealth University, Richmond, Virginia
| | | | - Stephen D Turner
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, Virginia
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21
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Ito T, Igaki T. Dissecting cellular senescence and SASP in Drosophila. Inflamm Regen 2016; 36:25. [PMID: 29259698 PMCID: PMC5725765 DOI: 10.1186/s41232-016-0031-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Accepted: 11/15/2016] [Indexed: 02/07/2023] Open
Abstract
Cellular senescence can act as both tumor suppressor and tumor promoter depending on the cellular contexts. On one hand, premature senescence has been considered as an innate host defense mechanism against carcinogenesis in mammals. In response to various stresses including oxidative stress, DNA damage, and oncogenic stress, suffered cells undergo irreversible cell cycle arrest, leading to tumor suppression. On the other hand, recent studies in mammalian systems have revealed that senescent cells can drive oncogenesis by secreting diverse proteins such as inflammatory cytokines, matrix remodeling factors, and growth factors, the phenomenon called senescence-associated secretory phenotype (SASP). However, the mechanisms by which these contradictory effects regulate tumor growth and metastasis in vivo have been elusive. Here, we review the recent discovery of cellular senescence in Drosophila and the mechanisms underlying senescence-mediated tumor regulation dissected by Drosophila genetics.
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Affiliation(s)
- Takao Ito
- Laboratory of Genetics, Graduate School of Biostudies, Kyoto University, Yoshida-Konoecho-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Tatsushi Igaki
- Laboratory of Genetics, Graduate School of Biostudies, Kyoto University, Yoshida-Konoecho-cho, Sakyo-ku, Kyoto, 606-8501, Japan
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22
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Longevity-modulating effects of symbiosis: insights from Drosophila–Wolbachia interaction. Biogerontology 2016; 17:785-803. [DOI: 10.1007/s10522-016-9653-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Accepted: 05/18/2016] [Indexed: 01/30/2023]
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23
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Epigenetic mechanisms of dietary restriction induced aging in Drosophila. Exp Gerontol 2015; 72:38-44. [DOI: 10.1016/j.exger.2015.08.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Revised: 08/04/2015] [Accepted: 08/25/2015] [Indexed: 01/07/2023]
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24
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Yin F, Sancheti H, Liu Z, Cadenas E. Mitochondrial function in ageing: coordination with signalling and transcriptional pathways. J Physiol 2015; 594:2025-42. [PMID: 26293414 DOI: 10.1113/jp270541] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 08/13/2015] [Indexed: 12/14/2022] Open
Abstract
Mitochondrial dysfunction entailing decreased energy-transducing capacity and perturbed redox homeostasis is an early and sometimes initiating event in ageing and age-related disorders involving tissues with high metabolic rate such as brain, liver and heart. In the central nervous system (CNS), recent findings from our and other groups suggest that the mitochondrion-centred hypometabolism is a key feature of ageing brains and Alzheimer's disease. This hypometabolic state is manifested by lowered neuronal glucose uptake, metabolic shift in the astrocytes, and alternations in mitochondrial tricarboxylic acid cycle function. Similarly, in liver and adipose tissue, mitochondrial capacity around glucose and fatty acid metabolism and thermogenesis is found to decline with age and is implicated in age-related metabolic disorders such as obesity and type 2 diabetes mellitus. These mitochondrion-related disorders in peripheral tissues can impact on brain functions through metabolic, hormonal and inflammatory signals. At the cellular level, studies in CNS and non-CNS tissues support the notion that instead of being viewed as autonomous organelles, mitochondria are part of a dynamic network with close interactions with other cellular components through energy- or redox-sensitive cytosolic kinase signalling and transcriptional pathways. Hence, it would be critical to further understand the molecular mechanisms involved in the communication between mitochondria and the rest of the cell. Therapeutic strategies that effectively preserves or improve mitochondrial function by targeting key component of these signalling cascades could represent a novel direction for numerous mitochondrion-implicated, age-related disorders.
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Affiliation(s)
- Fei Yin
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Harsh Sancheti
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Zhigang Liu
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
| | - Enrique Cadenas
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089-9121, USA
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Liu Z, Patil IY, Jiang T, Sancheti H, Walsh JP, Stiles BL, Yin F, Cadenas E. High-fat diet induces hepatic insulin resistance and impairment of synaptic plasticity. PLoS One 2015; 10:e0128274. [PMID: 26023930 PMCID: PMC4449222 DOI: 10.1371/journal.pone.0128274] [Citation(s) in RCA: 143] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 04/23/2015] [Indexed: 01/07/2023] Open
Abstract
High-fat diet (HFD)-induced obesity is associated with insulin resistance, which may affect brain synaptic plasticity through impairment of insulin-sensitive processes underlying neuronal survival, learning, and memory. The experimental model consisted of 3 month-old C57BL/6J mice fed either a normal chow diet (control group) or a HFD (60% of calorie from fat; HFD group) for 12 weeks. This model was characterized as a function of time in terms of body weight, fasting blood glucose and insulin levels, HOMA-IR values, and plasma triglycerides. IRS-1/Akt pathway was assessed in primary hepatocytes and brain homogenates. The effect of HFD in brain was assessed by electrophysiology, input/output responses and long-term potentiation. HFD-fed mice exhibited a significant increase in body weight, higher fasting glucose- and insulin levels in plasma, lower glucose tolerance, and higher HOMA-IR values. In liver, HFD elicited (a) a significant decrease of insulin receptor substrate (IRS-1) phosphorylation on Tyr608 and increase of Ser307 phosphorylation, indicative of IRS-1 inactivation; (b) these changes were accompanied by inflammatory responses in terms of increases in the expression of NFκB and iNOS and activation of the MAP kinases p38 and JNK; (c) primary hepatocytes from mice fed a HFD showed decreased cellular oxygen consumption rates (indicative of mitochondrial functional impairment); this can be ascribed partly to a decreased expression of PGC1α and mitochondrial biogenesis. In brain, HFD feeding elicited (a) an inactivation of the IRS-1 and, consequentially, (b) a decreased expression and plasma membrane localization of the insulin-sensitive neuronal glucose transporters GLUT3/GLUT4; (c) a suppression of the ERK/CREB pathway, and (d) a substantial decrease in long-term potentiation in the CA1 region of hippocampus (indicative of impaired synaptic plasticity). It may be surmised that 12 weeks fed with HFD induce a systemic insulin resistance that impacts profoundly on brain activity, i.e., synaptic plasticity.
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Affiliation(s)
- Zhigang Liu
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Ishan Y. Patil
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - Tianyi Jiang
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - Harsh Sancheti
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - John P. Walsh
- Davis School of Gerontology and Program in Neuroscience, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - Bangyan L. Stiles
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - Fei Yin
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
| | - Enrique Cadenas
- Pharmacology & Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, 90089, United States of America
- * E-mail:
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The drosophila T-box transcription factor midline functions within Insulin/Akt and c-Jun-N terminal kinase stress-reactive signaling pathways to regulate interommatial bristle formation and cell survival. Mech Dev 2015; 136:8-29. [PMID: 25748605 DOI: 10.1016/j.mod.2015.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 02/16/2015] [Accepted: 02/17/2015] [Indexed: 02/04/2023]
Abstract
We recently reported that the T-box transcription factor midline (mid) functions within the Notch-Delta signaling pathway to specify sensory organ precursor (SOP) cell fates in early-staged pupal eye imaginal discs and to suppress apoptosis (Das et al.). From genetic and allelic modifier screens, we now report that mid interacts with genes downstream of the insulin receptor(InR)/Akt, c-Jun-N-terminal kinase (JNK) and Notch signaling pathways to regulate interommatidial bristle (IOB) formation and cell survival. One of the most significant mid-interacting genes identified from the modifier screen is dFOXO, a transcription factor exhibiting a nucleocytoplasmic subcellular distribution pattern. In common with dFOXO, we show that Mid exhibits a nucleocytoplasmic distribution pattern within WT third-instar larval (3(o)L) tissue homogenates. Because dFOXO is a stress-responsive factor, we assayed the effects of either oxidative or metabolic stress responses on modifying the mid mutant phenotype which is characterized by a 50% loss of IOBs within the adult compound eye. While metabolic starvation stress does not affect the mid mutant phenotype, either 1 mM paraquat or 20% coconut oil, oxidative stress inducers, partially suppresses the mid mutant phenotype resulting in a significant recovery of IOBs. Another significant mid-interacting gene we identified is groucho (gro). Mid and Gro are predicted to act as corepressors of the enhancer-of-split gene complex downstream of Notch. Immunolabeling WT and dFOXO null 3(o)L eye-antennal imaginal discs with anti-Mid and anti-Engrailed (En) antibodies indicate that dFOXO is required to activate Mid and En expression within photoreceptor neurons of the eye disc. Taken together, these studies show that Mid and dFOXO serve as critical effectors of cell fate specification and survival within integrated Notch, InR/dAkt, and JNK signaling pathways during 3(o)L and pupal eye imaginal disc development.
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Owusu-Ansah E, Perrimon N. Modeling metabolic homeostasis and nutrient sensing in Drosophila: implications for aging and metabolic diseases. Dis Model Mech 2015; 7:343-50. [PMID: 24609035 PMCID: PMC3944494 DOI: 10.1242/dmm.012989] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Over the past decade, numerous reports have underscored the similarities between the metabolism of Drosophila and vertebrates, with the identification of evolutionarily conserved enzymes and analogous organs that regulate carbohydrate and lipid metabolism. It is now well established that the major metabolic, energy-sensing and endocrine signaling networks of vertebrate systems are also conserved in flies. Accordingly, studies in Drosophila are beginning to unravel how perturbed energy balance impinges on lifespan and on the ensuing diseases when energy homeostasis goes awry. Here, we highlight several emerging concepts that are at the nexus between obesity, nutrient sensing, metabolic homeostasis and aging. Specifically, we summarize the endocrine mechanisms that regulate carbohydrate and lipid metabolism, and provide an overview of the neuropeptides that regulate feeding behavior. We further describe the various efforts at modeling the effects of high-fat or -sugar diets in Drosophila and the signaling mechanisms involved in integrating organ function. Finally, we draw attention to some of the cardinal discoveries made with these disease models and how these could spur new research questions in vertebrate systems.
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Affiliation(s)
- Edward Owusu-Ansah
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA
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28
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Control of metabolic adaptation to fasting by dILP6-induced insulin signaling in Drosophila oenocytes. Proc Natl Acad Sci U S A 2014; 111:17959-64. [PMID: 25472843 DOI: 10.1073/pnas.1409241111] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Metabolic adaptation to changing dietary conditions is critical to maintain homeostasis of the internal milieu. In metazoans, this adaptation is achieved by a combination of tissue-autonomous metabolic adjustments and endocrine signals that coordinate the mobilization, turnover, and storage of nutrients across tissues. To understand metabolic adaptation comprehensively, detailed insight into these tissue interactions is necessary. Here we characterize the tissue-specific response to fasting in adult flies and identify an endocrine interaction between the fat body and liver-like oenocytes that regulates the mobilization of lipid stores. Using tissue-specific expression profiling, we confirm that oenocytes in adult flies play a central role in the metabolic adaptation to fasting. Furthermore, we find that fat body-derived Drosophila insulin-like peptide 6 (dILP6) induces lipid uptake in oenocytes, promoting lipid turnover during fasting and increasing starvation tolerance of the animal. Selective activation of insulin/IGF signaling in oenocytes by a fat body-derived peptide represents a previously unidentified regulatory principle in the control of metabolic adaptation and starvation tolerance.
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Wang L, Karpac J, Jasper H. Promoting longevity by maintaining metabolic and proliferative homeostasis. ACTA ACUST UNITED AC 2014; 217:109-18. [PMID: 24353210 DOI: 10.1242/jeb.089920] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Aging is characterized by a widespread loss of homeostasis in biological systems. An important part of this decline is caused by age-related deregulation of regulatory processes that coordinate cellular responses to changing environmental conditions, maintaining cell and tissue function. Studies in genetically accessible model organisms have made significant progress in elucidating the function of such regulatory processes and the consequences of their deregulation for tissue function and longevity. Here, we review such studies, focusing on the characterization of processes that maintain metabolic and proliferative homeostasis in the fruitfly Drosophila melanogaster. The primary regulatory axis addressed in these studies is the interaction between signaling pathways that govern the response to oxidative stress, and signaling pathways that regulate cellular metabolism and growth. The interaction between these pathways has important consequences for animal physiology, and its deregulation in the aging organism is a major cause for increased mortality. Importantly, protocols to tune such interactions genetically to improve homeostasis and extend lifespan have been established by work in flies. This includes modulation of signaling pathway activity in specific tissues, including adipose tissue and insulin-producing tissues, as well as in specific cell types, such as stem cells of the fly intestine.
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Affiliation(s)
- Lifen Wang
- Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945-1400, USA
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Abstract
Mitochondria play a central role in the aging process. Studies in model organisms have started to integrate mitochondrial effects on aging with the maintenance of protein homeostasis. These findings center on the mitochondrial unfolded protein response (UPR(mt)), which has been implicated in lifespan extension in worms, flies, and mice, suggesting a conserved role in the long-term maintenance of cellular homeostasis. Here, we review current knowledge of the UPR(mt) and discuss its integration with cellular pathways known to regulate lifespan. We highlight how insight into the UPR(mt) is revolutionizing our understanding of mitochondrial lifespan extension and of the aging process.
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Affiliation(s)
- Martin Borch Jensen
- Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945-1400, USA
| | - Heinrich Jasper
- Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato, CA 94945-1400, USA.
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31
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He Y, Jasper H. Studying aging in Drosophila. Methods 2014; 68:129-33. [PMID: 24751824 DOI: 10.1016/j.ymeth.2014.04.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 04/08/2014] [Accepted: 04/09/2014] [Indexed: 11/28/2022] Open
Abstract
Drosophila melanogaster represents one of the most important genetically accessible model organisms for aging research. Studies in flies have identified single gene mutations that influence lifespan and have characterized endocrine signaling interactions that control homeostasis systemically. Recent studies have focused on the effects of aging on specific tissues and physiological processes, providing a comprehensive picture of age-related tissue dysfunction and the loss of systemic homeostasis. Here we review methodological aspects of this work and highlight technical considerations when using Drosophila to study aging and age-related diseases.
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Affiliation(s)
- Ying He
- Buck Institute for Research on Aging, Novato, CA, USA
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Snell TW, Johnston RK, Rabeneck B, Zipperer C, Teat S. Joint inhibition of TOR and JNK pathways interacts to extend the lifespan of Brachionus manjavacas (Rotifera). Exp Gerontol 2014; 52:55-69. [PMID: 24486130 PMCID: PMC3970784 DOI: 10.1016/j.exger.2014.01.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Revised: 01/17/2014] [Accepted: 01/20/2014] [Indexed: 12/30/2022]
Abstract
The TOR kinase pathway is central in modulating aging in a variety of animal models. The target of rapamycin (TOR) integrates a complex network of signals from growth conditions, nutrient availability, energy status, and physiological stresses and matches an organism's growth rate to the resource environment. Important remaining problems are the identification of the pathways that interact with TOR and their characterization as additive or synergistic. One of the most versatile stress sensors in metazoans is the Jun-N-terminal kinase (JNK) signaling pathway. JNK is an evolutionarily conserved stress-activated protein kinase that is induced by a range of stressors, including UV irradiation, reactive oxygen species, DNA damage, heat, and bacterial antigens. JNK is thought to interact with the TOR pathway, but its effects on TOR are poorly understood. We used the rotifer Brachionus manjavacas as a model animal to probe the regulation of TOR and JNK pathways and explore their interaction. The effect of various chemical inhibitors was examined in life table and stressor challenge experiments. A survey of 12 inhibitors revealed two, rapamycin and JNK inhibitor, that significantly extended lifespan of B. manjavacas. At 1 μM concentration, exposure to rapamycin or JNK inhibitor extended mean rotifer lifespan by 35% and maximum lifespan by 37%. Exposure to both rapamycin and JNK inhibitor simultaneously extended mean rotifer lifespan by 65% more than either alone. Exposure to a combination of rapamycin and JNK inhibitors conveyed greater protection to starvation, UV and osmotic stress than either inhibitor alone. RNAi knockdown of TOR and JNK gene expression was investigated for its ability to extend rotifer lifespan. RNAi knockdown of the TOR gene resulted in 29% extension of the mean lifespan compared to control and knockdown of the JNK gene resulted in 51% mean lifespan extension. In addition to the lifespan, we quantified mitochondria activity using the fluorescent marker MitoTracker and lysosome activity using LysoTracker. Treatment of rotifers with JNK inhibitor enhanced mitochondria activity nearly 3-fold, whereas rapamycin treatment had no significant effect. Treatment of rotifers with rapamycin or JNK inhibitor reduced lysosome activity in 1, 3 and 8 day old animals, but treatment with both inhibitors did not produce any additive effect. We conclude that inhibition of TOR and JNK pathways significantly extends the lifespan of B. manjavacas. These pathways interact so that inhibition of both simultaneously acts additively to extend rotifer lifespan more than the inhibition of either alone.
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Affiliation(s)
- Terry W Snell
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA.
| | - Rachel K Johnston
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA
| | - Brett Rabeneck
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA
| | - Cody Zipperer
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA
| | - Stephanie Teat
- School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA
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33
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Ayyaz A, Jasper H. Intestinal inflammation and stem cell homeostasis in aging Drosophila melanogaster. Front Cell Infect Microbiol 2013; 3:98. [PMID: 24380076 PMCID: PMC3863754 DOI: 10.3389/fcimb.2013.00098] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 11/27/2013] [Indexed: 12/19/2022] Open
Abstract
As a barrier epithelium, the intestinal epithelium has to coordinate physiological functions like digestion and nutrient resorption with the control of commensal bacteria and the prevention of pathogenic infections. It can therefore mount powerful innate immune and inflammatory responses, while, at the same time, maintaining tissue homeostasis through regenerative processes. How these different functions are coordinated remains unclear, and further insight is required to understand the age-related loss of homeostasis in this system, as well as the etiology of inflammatory and proliferative diseases of the gut. Recent work in Drosophila melanogaster has provided important new insight into the regulation of regenerative activity, innate immune homeostasis, commensal control, as well as age-related dysfunction in the intestine. Interestingly, many of the identified processes and mechanisms mirror similar homeostatic processes in the vertebrate intestine. This review summarized the current understanding of how innate immune responses, changes in commensal bacteria, and other challenges influence regenerative activity in the aging intestinal epithelium of flies and draws parallels to similar processes in mammals.
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Affiliation(s)
- Arshad Ayyaz
- Buck Institute for Research on Aging Novato, CA, USA
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Jiang T, Yin F, Yao J, Brinton RD, Cadenas E. Lipoic acid restores age-associated impairment of brain energy metabolism through the modulation of Akt/JNK signaling and PGC1α transcriptional pathway. Aging Cell 2013; 12:1021-31. [PMID: 23815272 DOI: 10.1111/acel.12127] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/23/2013] [Indexed: 12/12/2022] Open
Abstract
This study examines the progress of a hypometabolic state inherent in brain aging with an animal model consisting of Fischer 344 rats of young, middle, and old ages. Dynamic microPET scanning demonstrated a significant decline in brain glucose uptake at old ages, which was associated with a decrease in the expression of insulin-sensitive neuronal glucose transporters GLUT3/4 and of microvascular endothelium GLUT1. Brain aging was associated with an imbalance between the PI3K/Akt pathway of insulin signaling and c-Jun N-terminal kinase (JNK) signaling and a downregulation of the PGC1α-mediated transcriptional pathway of mitochondrial biogenesis that impinged on multiple aspects of energy homeostasis. R-(+)-lipoic acid treatment increased glucose uptake, restored the balance of Akt/JNK signaling, and enhanced mitochondrial bioenergetics and the PGC1α-driven mitochondrial biogenesis. It may be surmised that impairment of a mitochondria-cytosol-nucleus communication is underlying the progression of the age-related hypometabolic state in brain; the effects of lipoic acid are not organelle-limited, but reside on the functional and effective coordination of this communication that results in improved energy metabolism.
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Affiliation(s)
- Tianyi Jiang
- Pharmacology & Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Fei Yin
- Pharmacology & Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Jia Yao
- Pharmacology & Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Roberta D. Brinton
- Pharmacology & Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
| | - Enrique Cadenas
- Pharmacology & Pharmaceutical Sciences; School of Pharmacy; University of Southern California; Los Angeles CA 90089 USA
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Abstract
Drosophila melanogaster has been widely used as a model of human Mendelian disease, but its value in modeling complex disease has received little attention. Fly models of complex disease would enable high-resolution mapping of disease-modifying loci and the identification of novel targets for therapeutic intervention. Here, we describe a fly model of permanent neonatal diabetes mellitus and explore the complexity of this model. The approach involves the transgenic expression of a misfolded mutant of human preproinsulin, hINSC96Y, which is a cause of permanent neonatal diabetes. When expressed in fly imaginal discs, hINSC96Y causes a reduction of adult structures, including the eye, wing, and notum. Eye imaginal discs exhibit defects in both the structure and the arrangement of ommatidia. In the wing, expression of hINSC96Y leads to ectopic expression of veins and mechano-sensory organs, indicating disruption of wild-type signaling processes regulating cell fates. These readily measurable “disease” phenotypes are sensitive to temperature, gene dose, and sex. Mutant (but not wild-type) proinsulin expression in the eye imaginal disc induces IRE1-mediated XBP1 alternative splicing, a signal for endoplasmic reticulum stress response activation, and produces global change in gene expression. Mutant hINS transgene tester strains, when crossed to stocks from the Drosophila Genetic Reference Panel, produce F1 adults with a continuous range of disease phenotypes and large broad-sense heritability. Surprisingly, the severity of mutant hINS-induced disease in the eye is not correlated with that in the notum in these crosses, nor with eye reduction phenotypes caused by the expression of two dominant eye mutants acting in two different eye development pathways, Drop (Dr) or Lobe (L), when crossed into the same genetic backgrounds. The tissue specificity of genetic variability for mutant hINS-induced disease has, therefore, its own distinct signature. The genetic dominance of disease-specific phenotypic variability in our model of misfolded human proinsulin makes this approach amenable to genome-wide association study in a simple F1 screen of natural variation.
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36
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Karpac J, Biteau B, Jasper H. Misregulation of an adaptive metabolic response contributes to the age-related disruption of lipid homeostasis in Drosophila. Cell Rep 2013; 4:1250-61. [PMID: 24035390 DOI: 10.1016/j.celrep.2013.08.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 07/16/2013] [Accepted: 08/02/2013] [Indexed: 01/06/2023] Open
Abstract
Loss of metabolic homeostasis is a hallmark of aging and is commonly characterized by the deregulation of adaptive signaling interactions that coordinate energy metabolism with dietary changes. The mechanisms driving age-related changes in these adaptive responses remain unclear. Here, we characterize the deregulation of an adaptive metabolic response and the development of metabolic dysfunction in the aging intestine of Drosophila. We find that activation of the insulin-responsive transcription factor Foxo in intestinal enterocytes is required to inhibit the expression of evolutionarily conserved lipases as part of a metabolic response to dietary changes. This adaptive mechanism becomes chronically activated in the aging intestine, mediated by changes in Jun-N-terminal kinase (JNK) signaling. Age-related chronic JNK/Foxo activation in enterocytes is deleterious, leading to sustained repression of intestinal lipase expression and the disruption of lipid homeostasis. Changes in the regulation of Foxo-mediated adaptive responses thus contribute to the age-associated breakdown of metabolic homeostasis.
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Affiliation(s)
- Jason Karpac
- Department of Biology, University of Rochester, Rochester, NY 14627, USA; Buck Institute for Research on Aging, Novato, CA 94945, USA.
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37
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Laslo M, Sun X, Hsiao CT, Wu WW, Shen RF, Zou S. A botanical containing freeze dried açai pulp promotes healthy aging and reduces oxidative damage in sod1 knockdown flies. AGE (DORDRECHT, NETHERLANDS) 2013; 35:1117-32. [PMID: 22639178 PMCID: PMC3705126 DOI: 10.1007/s11357-012-9437-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 05/16/2012] [Indexed: 05/10/2023]
Abstract
Superoxide dismutase 1 (SOD1), a critical enzyme against oxidative stress, is implicated in aging and degenerative diseases. We previously showed that a nutraceutical containing freeze-dried açai pulp promotes survival of flies fed a high-fat diet or sod1 knockdown flies fed a standard diet. Here, we investigated the effect of açai supplementation initiated at the early or late young adulthood on lifespan, physiological function, and oxidative damage in sod1 knockdown flies. We found that Açai supplementation extended lifespan even when started at the age of 10 days, which is the time shortly before the mortality rate of flies accelerated. Life-long açai supplementation increased lifetime reproductive output in sod1 knockdown flies. Our molecular studies indicate that açai supplementation reduced the protein levels of genes involved in oxidative stress response, cellular growth, and nutrient metabolism. Açai supplementation also affected the protein levels of ribosomal proteins. In addition, açai supplementation decreased the transcript levels of genes involved in oxidative stress response and gluconeogenesis, while increasing the transcript levels of mitochondrial biogenesis genes. Moreover, açai supplementation reduced the level of 4-hydroxynonenal-protein adducts, a lipid peroxidation marker. Our findings suggest that açai supplementation promotes healthy aging in sod1-deficient flies partly through reducing oxidative damage, and modulating nutrient metabolism and oxidative stress response pathways. Our findings provide a foundation to further evaluate the viability of using açai as an effective dietary intervention to promote healthy aging and alleviate symptoms of diseases with a high level of oxidative stress.
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Affiliation(s)
- Mara Laslo
- />Laboratory of Experimental Gerontology, National Institute on Aging, 251 Bayview Blvd., Suite #100, Baltimore, MD 21224 USA
| | - Xiaoping Sun
- />Laboratory of Experimental Gerontology, National Institute on Aging, 251 Bayview Blvd., Suite #100, Baltimore, MD 21224 USA
| | - Cheng-Te Hsiao
- />Laboratory of Experimental Gerontology, National Institute on Aging, 251 Bayview Blvd., Suite #100, Baltimore, MD 21224 USA
| | - Wells W. Wu
- />Laboratory of Clinical Investigation, National Institute on Aging, Baltimore, MD 21224 USA
| | - Rong-Fong Shen
- />Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892 USA
| | - Sige Zou
- />Laboratory of Experimental Gerontology, National Institute on Aging, 251 Bayview Blvd., Suite #100, Baltimore, MD 21224 USA
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Bowers J, Terrien J, Clerget-Froidevaux MS, Gothié JD, Rozing MP, Westendorp RGJ, van Heemst D, Demeneix BA. Thyroid hormone signaling and homeostasis during aging. Endocr Rev 2013; 34:556-89. [PMID: 23696256 DOI: 10.1210/er.2012-1056] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Studies in humans and in animal models show negative correlations between thyroid hormone (TH) levels and longevity. TH signaling is implicated in maintaining and integrating metabolic homeostasis at multiple levels, notably centrally in the hypothalamus but also in peripheral tissues. The question is thus raised of how TH signaling is modulated during aging in different tissues. Classically, TH actions on mitochondria and heat production are obvious candidates to link negative effects of TH to aging. Mitochondrial effects of excess TH include reactive oxygen species and DNA damage, 2 factors often considered as aging accelerators. Inversely, caloric restriction, which can retard aging from nematodes to primates, causes a rapid reduction of circulating TH, reducing metabolism in birds and mammals. However, many other factors could link TH to aging, and it is these potentially subtler and less explored areas that are highlighted here. For example, effects of TH on membrane composition, inflammatory responses, stem cell renewal and synchronization of physiological responses to light could each contribute to TH regulation of maintenance of homeostasis during aging. We propose the hypothesis that constraints on TH signaling at certain life stages, notably during maturity, are advantageous for optimal aging.
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Affiliation(s)
- J Bowers
- Muséum national d'Histoire Naturelle, Laboratoire de Physiologie Générale et Comparée, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 7221, 75231 Paris cedex 5, France
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39
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Alcedo J, Flatt T, Pasyukova EG. Neuronal inputs and outputs of aging and longevity. Front Genet 2013; 4:71. [PMID: 23653632 PMCID: PMC3644678 DOI: 10.3389/fgene.2013.00071] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 04/13/2013] [Indexed: 12/14/2022] Open
Abstract
An animal’s survival strongly depends on its ability to maintain homeostasis in response to the changing quality of its external and internal environment. This is achieved through intracellular and intercellular communication within and among different tissues. One of the organ systems that plays a major role in this communication and the maintenance of homeostasis is the nervous system. Here we highlight different aspects of the neuronal inputs and outputs of pathways that affect aging and longevity. Accordingly, we discuss how sensory inputs influence homeostasis and lifespan through the modulation of different types of neuronal signals, which reflects the complexity of the environmental cues that affect physiology. We also describe feedback, compensatory, and feed-forward mechanisms in these longevity-modulating pathways that are necessary for homeostasis. Finally, we consider the temporal requirements for these neuronal processes and the potential role of natural genetic variation in shaping the neurobiology of aging.
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Affiliation(s)
- Joy Alcedo
- Friedrich Miescher Institute for Biomedical Research Basel, Switzerland ; Department of Biological Sciences, Wayne State University Detroit, MI, USA
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40
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Keipert S, Ost M, Chadt A, Voigt A, Ayala V, Portero-Otin M, Pamplona R, Al-Hasani H, Klaus S. Skeletal muscle uncoupling-induced longevity in mice is linked to increased substrate metabolism and induction of the endogenous antioxidant defense system. Am J Physiol Endocrinol Metab 2013; 304:E495-506. [PMID: 23277187 DOI: 10.1152/ajpendo.00518.2012] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ectopic expression of uncoupling protein 1 (UCP1) in skeletal muscle (SM) mitochondria increases lifespan considerably in high-fat diet-fed UCP1 Tg mice compared with wild types (WT). To clarify the underlying mechanisms, we investigated substrate metabolism as well as oxidative stress damage and antioxidant defense in SM of low-fat- and high-fat-fed mice. Tg mice showed an increased protein expression of phosphorylated AMP-activated protein kinase, markers of lipid turnover (p-ACC, FAT/CD36), and an increased SM ex vivo fatty acid oxidation. Surprisingly, UCP1 Tg mice showed elevated lipid peroxidative protein modifications with no changes in glycoxidation or direct protein oxidation. This was paralleled by an induction of catalase and superoxide dismutase activity, an increased redox signaling (MAPK signaling pathway), and increased expression of stress-protective heat shock protein 25. We conclude that increased skeletal muscle mitochondrial uncoupling in vivo does not reduce the oxidative stress status in the muscle cell. Moreover, it increases lipid metabolism and reactive lipid-derived carbonyls. This stress induction in turn increases the endogenous antioxidant defense system and redox signaling. Altogether, our data argue for an adaptive role of reactive species as essential signaling molecules for health and longevity.
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Affiliation(s)
- S Keipert
- German Institute of Human Nutrition, Potsdam-Rehbruecke, Germany
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41
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Wang C, Wheeler CT, Alberico T, Sun X, Seeberger J, Laslo M, Spangler E, Kern B, de Cabo R, Zou S. The effect of resveratrol on lifespan depends on both gender and dietary nutrient composition in Drosophila melanogaster. AGE (DORDRECHT, NETHERLANDS) 2013; 35:69-81. [PMID: 22083438 PMCID: PMC3543742 DOI: 10.1007/s11357-011-9332-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Accepted: 10/15/2011] [Indexed: 05/05/2023]
Abstract
Resveratrol, a polyphenolic compound, has been shown to extend lifespan in different organisms. Emerging evidence suggests that the prolongevity effect of resveratrol depends on dietary composition. However, the mechanisms underlying the interaction of resveratrol and dietary nutrients in modulating lifespan remain elusive. Here, we investigated the effect of resveratrol on lifespan of Drosophila melanogaster fed diets differing in the concentrations of sugar, yeast extract, and palmitic acid representing carbohydrate, protein, and fat, respectively. Resveratrol at up to 200 μM in diets did not affect lifespan of wild-type female flies fed a standard, restricted or high sugar-low protein diet, but extended lifespan of females fed a low sugar-high protein diet. Resveratrol at 400 μM extended lifespan of females fed a high-fat diet. Lifespan extension by resveratrol was associated with downregulation of genes in aging-related pathways, including antioxidant peroxiredoxins, insulin-like peptides involved in insulin-like signaling and several downstream genes in Jun-kinase signaling involved in oxidative stress response. Furthermore, resveratrol increased lifespan of superoxide dismutase 1 (sod1) knockdown mutant females fed a standard or high-fat diet. No lifespan extension by resveratrol was observed in wild-type and sod1 knockdown males under the culture conditions in this study. Our results suggest that the gender-specific prolongevity effect of resveratrol is influenced by dietary composition and resveratrol promotes the survival of flies by modulating genetic pathways that can reduce cellular damage. This study reveals the context-dependent effect of resveratrol on lifespan and suggests the importance of dietary nutrients in implementation of effective aging interventions using dietary supplements.
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Affiliation(s)
- Chunxu Wang
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
- />Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Habei 430074 People’s Republic of China
| | - Charles T. Wheeler
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Thomas Alberico
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Xiaoping Sun
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Jeanne Seeberger
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Mara Laslo
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Edward Spangler
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Bradley Kern
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Rafael de Cabo
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
| | - Sige Zou
- />Laboratory of Experimental Gerontology, National Institute on Aging, Baltimore, MD 21224 USA
- />Functional Genomics Unit, Laboratory of Experimental Gerontology, National Institute on Aging, 251 Bayview Blvd., Suite 100, Baltimore, MD 21224 USA
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Metabolic triad in brain aging: mitochondria, insulin/IGF-1 signalling and JNK signalling. Biochem Soc Trans 2013; 41:101-5. [PMID: 23356266 PMCID: PMC9934302 DOI: 10.1042/bst20120260] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mitochondria generate second messengers, such as H2O2, that are involved in the redox regulation of cell signalling and their function is regulated by several cytosolic signalling pathways. IIS [insulin/IGF1 (insulin-like growth factor 1) signalling] in the brain proceeds mainly through the PI3K (phosphatidylinositol 3-kinase)-Akt (protein kinase B) pathway, which is involved in the regulation of synaptic plasticity and neuronal survival via the maintenance of the bioenergetic and metabolic capacities of mitochondria. Conversely, the JNK (c-Jun N-terminal kinase) pathway is induced by increased oxidative stress and JNK translocation to the mitochondrion results in impairment of energy metabolism. Moreover, IIS and JNK signalling interact with and antagonize each other. This review focuses on functional outcomes of a metabolic triad that entails the co-ordination of mitochondrial function (energy transducing and redox regulation), IIS and JNK signalling, in the aging brain and in neurodegenerative disorders, such as Alzheimer's disease.
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43
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Gimenez LED, Ghildyal P, Fischer KE, Hu H, Ja WW, Eaton BA, Wu Y, Austad SN, Ranjan R. Modulation of methuselah expression targeted to Drosophila insulin-producing cells extends life and enhances oxidative stress resistance. Aging Cell 2013; 12:121-9. [PMID: 23121290 DOI: 10.1111/acel.12027] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/26/2012] [Indexed: 01/14/2023] Open
Abstract
Ubiquitously reduced signaling via Methuselah (MTH), a G-protein-coupled receptor (GPCR) required for neurosecretion, has previously been reported to extend life and enhance stress resistance in flies. Whether these effects are due to reduced MTH signalling in specific tissues remains unknown. We determined that reduced expression of mth targeted to the insulin-producing cells (IPCs) of the fly brain was sufficient to extend life and enhance oxidative stress resistance. Paradoxically, we discovered that overexpression of mth targeted to the same cells has similar phenotypic effects to reduced expression due to MTH's interaction with β-arrestin, which uncouples GPCRs from their G-proteins. We confirmed the functional relationship between MTH and β-arrestin by finding that IPC-targeted overexpression of β-arrestin alone mimics the longevity phenotype of reduced MTH signaling. As reduced MTH signaling also inhibits insulin secretion from the IPCs, the most parsimonious mechanistic explanation of its longevity and stress-resistance enhancement might be through reduced insulin/IGF signaling (IIS). However, examination of phenotypic features of long-lived IPC-mth modulated flies as well as several downstream IIS targets implicates enhanced activity of the JNK stress-resistance pathway more directly than insulin signaling in the longevity and stress-resistance phenotypes.
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Affiliation(s)
- Luis E. D. Gimenez
- Department of Pharmacology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78245; USA
| | - Parakashtha Ghildyal
- Department of Pharmacology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78245; USA
| | - Kathleen E. Fischer
- Department of Physiology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78229; USA
| | - Hongxiang Hu
- Department of Pharmacology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78245; USA
| | - William W. Ja
- Department of Metabolism & Aging; The Scripps Research Institute; Jupiter; FL; 33458; USA
| | - Benjamin A. Eaton
- Department of Physiology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78229; USA
| | - Yimin Wu
- Department of Physiology; University of Texas Health Science Center San Antonio; San Antonio; TX; 78229; USA
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Yang L, Huang P, Li F, Zhao L, Zhang Y, Li S, Gan Z, Lin A, Li W, Liu Y. c-Jun amino-terminal kinase-1 mediates glucose-responsive upregulation of the RNA editing enzyme ADAR2 in pancreatic beta-cells. PLoS One 2012; 7:e48611. [PMID: 23139803 PMCID: PMC3490865 DOI: 10.1371/journal.pone.0048611] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 09/27/2012] [Indexed: 11/18/2022] Open
Abstract
A-to-I RNA editing catalyzed by the two main members of the adenosine deaminase acting on RNA (ADAR) family, ADAR1 and ADAR2, represents a RNA-based recoding mechanism implicated in a variety of cellular processes. Previously we have demonstrated that the expression of ADAR2 in pancreatic islet β-cells is responsive to the metabolic cues and ADAR2 deficiency affects regulated cellular exocytosis. To investigate the molecular mechanism by which ADAR2 is metabolically regulated, we found that in cultured β-cells and primary islets, the stress-activated protein kinase JNK1 mediates the upregulation of ADAR2 in response to changes of the nutritional state. In parallel with glucose induction of ADAR2 expression, JNK phosphorylation was concurrently increased in insulin-secreting INS-1 β-cells. Pharmacological inhibition of JNKs or siRNA knockdown of the expression of JNK1 prominently suppressed glucose-augmented ADAR2 expression, resulting in decreased efficiency of ADAR2 auto-editing. Consistently, the mRNA expression of Adar2 was selectively reduced in the islets from JNK1 null mice in comparison with that of wild-type littermates or JNK2 null mice, and ablation of JNK1 diminished high-fat diet-induced Adar2 expression in the islets from JNK1 null mice. Furthermore, promoter analysis of the mouse Adar2 gene identified a glucose-responsive region and revealed the transcription factor c-Jun as a driver of Adar2 transcription. Taken together, these results demonstrate that JNK1 serves as a crucial component in mediating glucose-responsive upregulation of ADAR2 expression in pancreatic β-cells. Thus, the JNK1 pathway may be functionally linked to the nutrient-sensing actions of ADAR2-mediated RNA editing in professional secretory cells.
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Affiliation(s)
- Liu Yang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ping Huang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Feng Li
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Liyun Zhao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yongliang Zhang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Shoufeng Li
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Zhenji Gan
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Anning Lin
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Wenjun Li
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yong Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- * E-mail:
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45
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Rynes J, Donohoe CD, Frommolt P, Brodesser S, Jindra M, Uhlirova M. Activating transcription factor 3 regulates immune and metabolic homeostasis. Mol Cell Biol 2012; 32:3949-62. [PMID: 22851689 PMCID: PMC3457521 DOI: 10.1128/mcb.00429-12] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 07/18/2012] [Indexed: 12/20/2022] Open
Abstract
Integration of metabolic and immune responses during animal development ensures energy balance, permitting both growth and defense. Disturbed homeostasis causes organ failure, growth retardation, and metabolic disorders. Here, we show that the Drosophila melanogaster activating transcription factor 3 (Atf3) safeguards metabolic and immune system homeostasis. Loss of Atf3 results in chronic inflammation and starvation responses mounted primarily by the larval gut epithelium, while the fat body suffers lipid overload, causing energy imbalance and death. Hyperactive proinflammatory and stress signaling through NF-κB/Relish, Jun N-terminal kinase, and FOXO in atf3 mutants deregulates genes important for immune defense, digestion, and lipid metabolism. Reducing the dose of either FOXO or Relish normalizes both lipid metabolism and gene expression in atf3 mutants. The function of Atf3 is conserved, as human ATF3 averts some of the Drosophila mutant phenotypes, improving their survival. The single Drosophila Atf3 may incorporate the diversified roles of two related mammalian proteins.
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Affiliation(s)
- Jan Rynes
- Institute for Genetics and Cologne Excellence Cluster in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
- Department of Molecular Biology, University of South Bohemia, Ceske Budejovice, Czech Republic
| | - Colin D. Donohoe
- Institute for Genetics and Cologne Excellence Cluster in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Peter Frommolt
- Bioinformatics Core Facility, CECAD, and Cologne Center for Genomics, Cologne, Germany
| | - Susanne Brodesser
- Lipidomics Core Facility, CECAD, and Institute for Medical Microbiology, Immunology and Hygiene, Cologne, Germany
| | - Marek Jindra
- Biology Center, Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic
| | - Mirka Uhlirova
- Institute for Genetics and Cologne Excellence Cluster in Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
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46
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Molecular mechanisms of aging and immune system regulation in Drosophila. Int J Mol Sci 2012; 13:9826-9844. [PMID: 22949833 PMCID: PMC3431831 DOI: 10.3390/ijms13089826] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 07/25/2012] [Accepted: 07/30/2012] [Indexed: 12/04/2022] Open
Abstract
Aging is a complex process that involves the accumulation of deleterious changes resulting in overall decline in several vital functions, leading to the progressive deterioration in physiological condition of the organism and eventually causing disease and death. The immune system is the most important host-defense mechanism in humans and is also highly conserved in insects. Extensive research in vertebrates has concluded that aging of the immune function results in increased susceptibility to infectious disease and chronic inflammation. Over the years, interest has grown in studying the molecular interaction between aging and the immune response to pathogenic infections. The fruit fly Drosophila melanogaster is an excellent model system for dissecting the genetic and genomic basis of important biological processes, such as aging and the innate immune system, and deciphering parallel mechanisms in vertebrate animals. Here, we review the recent advances in the identification of key players modulating the relationship between molecular aging networks and immune signal transduction pathways in the fly. Understanding the details of the molecular events involved in aging and immune system regulation will potentially lead to the development of strategies for decreasing the impact of age-related diseases, thus improving human health and life span.
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47
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Emlen DJ, Warren IA, Johns A, Dworkin I, Lavine LC. A mechanism of extreme growth and reliable signaling in sexually selected ornaments and weapons. Science 2012; 337:860-4. [PMID: 22837386 DOI: 10.1126/science.1224286] [Citation(s) in RCA: 314] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Many male animals wield ornaments or weapons of exaggerated proportions. We propose that increased cellular sensitivity to signaling through the insulin/insulin-like growth factor (IGF) pathway may be responsible for the extreme growth of these structures. We document how rhinoceros beetle horns, a sexually selected weapon, are more sensitive to nutrition and more responsive to perturbation of the insulin/IGF pathway than other body structures. We then illustrate how enhanced sensitivity to insulin/IGF signaling in a growing ornament or weapon would cause heightened condition sensitivity and increased variability in expression among individuals--critical properties of reliable signals of male quality. The possibility that reliable signaling arises as a by-product of the growth mechanism may explain why trait exaggeration has evolved so many different times in the context of sexual selection.
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Affiliation(s)
- Douglas J Emlen
- Division of Biological Sciences, The University of Montana, 104 Health Science Building, Missoula, MT 59812, USA.
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48
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Wang X, Chen WR, Xing D. A pathway from JNK through decreased ERK and Akt activities for FOXO3a nuclear translocation in response to UV irradiation. J Cell Physiol 2012; 227:1168-78. [PMID: 21604264 DOI: 10.1002/jcp.22839] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Forkhead box O (FOXO) transcription factors play an important role in physiological and pathological processes. Extracellular signal-regulated kinase (ERK) and protein kinase B (Akt) can phosphorylate FOXO and cause its degradation or cytoplasmic retention, respectively, leading to tumorigenesis. In addition, C-Jun N-terminal protein kinase (JNK) can promote FOXO nuclear localization, leading to apoptosis. Using confocal imaging of cells transfected with GFP-FOXO3a, we visualized the dynamic translocation of GFP-FOXO3a from the cytoplasm to the nucleus after UV irradiation in a time- and dose-dependent manner. We also found that UV irradiation caused activation of JNK, which in turn inactivated ERK and Akt, leading to FOXO3a translocation and Bim expression. Our results indicate that nuclear translocation of FOXO3a can be regulated by UV irradiation through the JNK-ERK/Akt pathway.
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Affiliation(s)
- Xianwang Wang
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
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49
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Novel protein kinase signaling systems regulating lifespan identified by small molecule library screening using Drosophila. PLoS One 2012; 7:e29782. [PMID: 22363408 PMCID: PMC3282711 DOI: 10.1371/journal.pone.0029782] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 12/05/2011] [Indexed: 11/19/2022] Open
Abstract
Protein kinase signaling cascades control most aspects of cellular function. The ATP binding domains of signaling protein kinases are the targets of most available inhibitors. These domains are highly conserved from mammals to flies. Herein we describe screening of a library of small molecule inhibitors of protein kinases for their ability to increase Drosophila lifespan. We developed an assay system which allowed screening using the small amounts of materials normally present in commercial chemical libraries. The studies identified 17 inhibitors, the majority of which targeted tyrosine kinases associated with the epidermal growth factor receptor (EGFR), platelet-derived growth factor (PDGF)/vascular endothelial growth factor (VEGF) receptors, G-protein coupled receptor (GPCR), Janus kinase (JAK)/signal transducer and activator of transcription (STAT), the insulin and insulin-like growth factor (IGFI) receptors. Comparison of the protein kinase signaling effects of the inhibitors in vitro defined a consensus intracellular signaling profile which included decreased signaling by p38MAPK (p38), c-Jun N-terminal kinase (JNK) and protein kinase C (PKC). If confirmed, many of these kinases will be novel additions to the signaling cascades known to regulate metazoan longevity.
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50
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Shoji I, Deng L, Hotta H. Molecular mechanism of hepatitis C virus-induced glucose metabolic disorders. Front Microbiol 2012; 2:278. [PMID: 22291689 PMCID: PMC3263922 DOI: 10.3389/fmicb.2011.00278] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 12/25/2011] [Indexed: 12/20/2022] Open
Abstract
Hepatitis C virus (HCV) infection causes not only intrahepatic diseases but also extrahepatic manifestations, including metabolic disorders. Chronic HCV infection is often associated with type 2 diabetes. However, the precise mechanism underlying this association is still unclear. Glucose is transported into hepatocytes via glucose transporter 2 (GLUT2). Hepatocytes play a crucial role in maintaining plasma glucose homeostasis via the gluconeogenic and glycolytic pathways. We have been investigating the molecular mechanism of HCV-related type 2 diabetes using HCV RNA replicon cells and HCV J6/JFH1 system. We found that HCV replication down-regulates cell surface expression of GLUT2 at the transcriptional level. We also found that HCV infection promotes hepatic gluconeogenesis in HCV J6/JFH1-infected Huh-7.5 cells. HCV infection transcriptionally up-regulated the genes for phosphoenolpyruvate carboxykinase (PEPCK) and glucose 6-phosphatase (G6Pase), the rate-limiting enzymes for hepatic gluconeogenesis. Gene expression of PEPCK and G6Pase was regulated by the transcription factor forkhead box O1 (FoxO1) in HCV-infected cells. Phosphorylation of FoxO1 at Ser319 was markedly diminished in HCV-infected cells, resulting in increased nuclear accumulation of FoxO1. HCV NS5A protein was directly linked with the FoxO1-dependent increased gluconeogenesis. This paper will discuss the current model of HCV-induced glucose metabolic disorders.
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Affiliation(s)
- Ikuo Shoji
- Division of Microbiology, Center for Infectious Diseases, Kobe University Graduate School of Medicine Kobe, Japan
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