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Li P, Kuo N, Patel R, Omary MB. Hypoosmosis alters hepatocyte mitochondrial morphology and induces selective release of carbamoyl phosphate synthetase 1. Am J Physiol Gastrointest Liver Physiol 2023; 325:G334-G346. [PMID: 37489865 PMCID: PMC10642991 DOI: 10.1152/ajpgi.00018.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/20/2023] [Accepted: 07/17/2023] [Indexed: 07/26/2023]
Abstract
Carbamoyl phosphate synthetase 1 (CPS1) is the most abundant hepatocyte mitochondrial matrix protein. Hypoosmotic stress increases CPS1 release in isolated mouse hepatocytes without cell death. We hypothesized that increased CPS1 release during hypoosmosis is selective and associates with altered mitochondrial morphology. Both ex vivo and in vivo models were assessed. Mouse hepatocytes and livers were challenged with isotonic or hypoosmotic (35 mosM) buffer. Mice were injected intraperitoneally with water (10% body weight) with or without an antidiuretic. Mitochondrial and cytosolic fractions were isolated using differential centrifugation, then analyzed by immunoblotting to assess subcellular redistribution of four mitochondrial proteins: CPS1, ornithine transcarbamylase (OTC), pyrroline-5-carboxylate reductase 1 (PYCR1), and cytochrome c. Mitochondrial morphology alterations were examined using electron microscopy. Hypoosmotic treatment of whole livers or hepatocytes led to preferential or increased mitochondrial release, respectively, of CPS1 as compared with two mitochondrial matrix proteins (OTC/PYCR1) and with the intermembrane space protein, cytochrome c. Mitochondrial apoptosis-induced channel opening using staurosporine in hepatocytes led to preferential CPS1 and cytochrome c release. The CPS1-selective changes were accompanied by dramatic alterations in ultrastructural mitochondrial morphology. In mice, hypoosmosis/hyponatremia led to increased liver vascular congestion and increased CPS1 in bile but not blood, coupled with mitochondrial structural alterations. In contrast, isotonic increase of intravascular volume led to a decrease in mitochondrial size with limited change in bile CPS1 compared with hypoosmotic conditions and absence of the hypoosmosis-associated histological alterations. Taken together, hepatocyte CPS1 is selectively released in response to hypoosmosis/hyponatremia and provides a unique biomarker of mitochondrial injury.NEW & NOTEWORTHY Exposure of isolated mouse livers, primary cultured hepatocytes, or mice to hypoosmosis/hyponatremia conditions induces significant mitochondrial shape alterations accompanied by preferential release of the mitochondrial matrix protein CPS1, a urea cycle enzyme. In contrast, the intermembrane space protein, cytochrome c, and two other matrix proteins, including the urea cycle enzyme ornithine transcarbamylase, remain preferentially retained in mitochondria. Therefore, hepatocyte CPS1 manifests unique mitochondrial stress response compartmentalization and is a sensitive sensor of mitochondrial hypoosmotic/hyponatremic injury.
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Affiliation(s)
- Pei Li
- Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, United States
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, New Jersey, United States
| | - Ning Kuo
- Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, United States
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, New Jersey, United States
| | - Rajesh Patel
- Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, United States
- Department of Pathology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey, United States
| | - M Bishr Omary
- Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey, United States
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, New Jersey, United States
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2
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Lee JW, Cho JY, Thuy PX, Moon EY. HeLa Cervical Cancer Cells Are Maintained by Nephronophthisis 3-Associated Primary Cilium Formation via ROS-Induced ERK and HIF-1α Activation under Serum-Deprived Normoxic Condition. Int J Mol Sci 2022; 23:ijms232314500. [PMID: 36498831 PMCID: PMC9739938 DOI: 10.3390/ijms232314500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 10/28/2022] [Accepted: 11/03/2022] [Indexed: 11/23/2022] Open
Abstract
The primary cilium (PC) is a microtubule-based antenna-like organelle projecting from the surface of the cell membrane. We previously reported that PC formation could be regulated by nephronophthisis 3 (NPHP3) expression followed by its interaction with thymosin β4. Here, we investigated whether cancer cell viability is regulated by NPHP3-mediated PC formation. The total and viable cell number were reduced by incubating cells under serum deprivation (SD) without fetal bovine serum (-FBS). PC frequency was increased by SD which enhanced NPHP3 expression and hypoxia inducible factor (HIF)-1α. The role of HIF-1α on NPHP3 expression and PC formation was confirmed by the binding of HIF-1α to the NPHP3 promoter and siRNA-based inhibition of HIF-1α (siHIF-1α), respectively. HIF-1α-stabilizing dimethyloxallyl glycine (DMOG) and hypoxic conditions increased NPHP3 expression and PC formation. In addition, as SD elevated the reactive oxygen species (ROS), PC frequency and NPHP3 expression were inhibited by a treatment with N-acetylcysteine (NAC), a ROS scavenger. PC formation was increased by H2O2 treatment, which was inhibited by siHIF-1α. The inhibition of ERK with P98059 decreased the frequency of PC formation and NPHP3 expression. Cell viability was reduced by a treatment with ciliobrevin A (CilioA) to inhibit PC formation, which was re-affirmed by using PC-deficient IFT88-/- cells. Taken together, the results imply that PC formation in cancer cells could be controlled by NPHP3 expression through ROS-induced HIF-1α and ERK activation under SD conditions. It suggests that cancer cell viability under SD conditions could be maintained by NPHP3 expression to regulate PC formation.
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Affiliation(s)
| | | | | | - Eun-Yi Moon
- Correspondence: ; Tel.: +82-2-3408-3768; Fax: +82-2-3408-4334
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3
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Zhao K, Xu T, Mao Y, Wu X, Hua D, Sheng Y, Li P. Alamandine alleviated heart failure and fibrosis in myocardial infarction mice. Biol Direct 2022; 17:25. [PMID: 36167556 PMCID: PMC9516792 DOI: 10.1186/s13062-022-00338-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/20/2022] [Indexed: 11/10/2022] Open
Abstract
Alamandine (Ala) is the newest identified peptide of the renin-angiotensin system and has protective effect on myocyte hypertrophy. However, it is still unclear whether Ala can alleviate heart failure (HF). The aim of this study was to explore the effects of Ala on HF and the related cardiac fibrosis, and to probe the mechanism. HF model was induced by myocardial infarction (MI) in mice. Four weeks after MI, Ala was administrated by intraperitoneal injection for two weeks. Ala injection significantly improved cardiac dysfunction of MI mice in vivo. The cardiac fibrosis and the related biomarkers were attenuated after Ala administration in HF mice in vivo. The increases of collagen I, alpha-smooth muscle actin and transforming growth factor-beta induced by oxygen–glucose deprivation (OGD) in neonatal rat cardiac fibroblasts (NRCFs) were inhibited by Ala treatment in vitro. The biomarkers of apoptosis were elevated in NRCFs induced by OGD, which were attenuated after treating with Ala in vitro. The enhancement of oxidative stress in the heart of MI mice or in the NRCFs treated with OGD was suppressed by treating with Ala in vivo and in vitro. These effects of Ala were reversed by tBHP, an exogenous inducer of oxidative stress in vitro. These results demonstrated that Ala could alleviate cardiac dysfunction and attenuate cardiac fibrosis via inhibition of oxidative stress.
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Affiliation(s)
- Kun Zhao
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Tianhua Xu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Yukang Mao
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Xiaoguang Wu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Dongxu Hua
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China
| | - Yanhui Sheng
- Department of Cardiology, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Gusu School, Nanjing Medical University, Suzhou, Jiangsu, China. .,Department of Cardiology, Jiangsu Province Hospital, Nanjing, Jiangsu, China.
| | - Peng Li
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu, China.
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4
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Sun Y, Xu H, Tan B, Yi Q, Liu H, Chen T, Xiang H, Wang R, Xie Q, Tian J, Zhu J. Andrographolide protects bone marrow mesenchymal stem cells against glucose and serum deprivation under hypoxia via the NRF2 signaling pathway. Stem Cell Res Ther 2022; 13:326. [PMID: 35850702 PMCID: PMC9290240 DOI: 10.1186/s13287-022-03016-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 11/24/2021] [Indexed: 12/15/2022] Open
Abstract
Background Bone marrow mesenchymal stem cell (BMSCs) therapy is an important cell transplantation strategy in the regenerative medicine field. However, a severely ischemic microenvironment, such as nutrient depletion and hypoxia, causes a lower survival rate of transplanted BMSCs, limiting the application of BMSCs. Therefore, improving BMSCs viability in adverse microenvironments is an important means to improve the effectiveness of BMSCs therapy. Objective To illustrate the protective effect of andrographolide (AG) against glucose and serum deprivation under hypoxia (1% O2) (GSDH)-induced cell injury in BMSCs and investigate the possible underlying mechanisms. Methods An in vitro primary rat BMSCs cell injury model was established by GSDH, and cellular viability, proliferation and apoptosis were observed after AG treatment under GSDH. Reactive oxygen species levels and oxidative stress-related genes and proteins were measured by flow cytometry, RT-qPCR and Western blotting. Mitochondrial morphology, function and number were further assessed by laser confocal microscopy and flow cytometry. Results AG protected BMSCs against GSDH-induced cell injury, as indicated by increases in cell viability and proliferation and mitochondrial number and decreases in apoptosis and oxidative stress. The metabolic status of BMSCs was changed from glycolysis to oxidative phosphorylation to increase the ATP supply. We further observed that the NRF2 pathway was activated by AG, and treatment of BMSCs with a specific NRF2 inhibitor (ML385) blocked the protective effect of AG. Conclusion Our results suggest that AG is a promising agent to improve the therapeutic effect of BMSCs. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-022-03016-6.
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Affiliation(s)
- Yanting Sun
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Hao Xu
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China.,Department of Clinical Laboratory, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Bin Tan
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Qin Yi
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Huiwen Liu
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Tangtian Chen
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Han Xiang
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Rui Wang
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Qiumin Xie
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China
| | - Jie Tian
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China.,Department of Cardiovascular (Internal Medicine), Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Jing Zhu
- Department of Pediatric Research Institute, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing, 400014, China.
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5
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Pan T, Qian Y, Li T, Zhang Z, He Y, Wang J, Li L, Hu Y, Lin M. Acetyl l-carnitine protects adipose-derived stem cells against serum-starvation: regulation on the network composed of reactive oxygen species, autophagy, apoptosis and senescence. Cytotechnology 2022; 74:105-121. [PMID: 35185289 PMCID: PMC8816993 DOI: 10.1007/s10616-021-00514-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 12/05/2021] [Indexed: 02/03/2023] Open
Abstract
Adipose-derived stem cells (ADSCs) play an important role in cell therapy and regenerative medicine. However, local nutritional deficiency often limits therapeutical effect of the transplanted cells. Acetyl l-carnitine (ALC) is a common energy metabolism regulator and free radical scavenger. This study investigated the effect of ALC on ADSCs exposed to severe serum-deprivation and explored the relative machanisms. Treating with 1 mM ALC improved proliferation and alleviated senescence of starved cells, accompanied with reduced reactive oxygen species (ROS) and increased protein expression of SOD1 and catalase. In addition, ALC inhibited apoptosis but increased starvation-induced autophagy, which might be related to the regulation of phases of dissociation of Bcl-2-Beclin1 and Bcl-2-Bax complexes. Evidence obtained by replacing ALC with N-acetylcysteine (N-AC) suggested that ROS might be the central inducer of autophagy, apoptosis and senescence. There was a difference between ALC and N-AC in the protection mechanism, that was, compared with N-AC, ALC maintained autophagy well at the same time as anti-oxidation. Inhibition of autophagy by 3-methyladenine (3-MA) partially offset the protective effect of ALC. However, despite low-level ROS and enhanced autophagy, ALC with high concentration (10 mM) markedly aggravated cell apoptosis and senescence, thus losing cytoprotection and even causing damage.
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Affiliation(s)
- Tianyun Pan
- Huzhou Traditional Chinese Medicine Hospital Affiliated to Zhejiang Chinese Medical University, 315 South Street, Wuxing Direct, Huzhou City, 313000 Zhejiang Province China
| | - Yao Qian
- The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Lucheng Direct, Wenzhou City, China
| | - Tian Li
- The First Affiliated Hospital of Wenzhou Medical University, Ouhai Direct, Wenzhou City, China
| | - Zikai Zhang
- The First Affiliated Hospital of Wenzhou Medical University, Ouhai Direct, Wenzhou City, China
| | - Yucang He
- The First Affiliated Hospital of Wenzhou Medical University, Ouhai Direct, Wenzhou City, China
| | - Jingping Wang
- The First Affiliated Hospital of Wenzhou Medical University, Ouhai Direct, Wenzhou City, China
| | - Liqun Li
- The First Affiliated Hospital of Wenzhou Medical University, Ouhai Direct, Wenzhou City, China
| | - Yun Hu
- Huzhou Traditional Chinese Medicine Hospital Affiliated to Zhejiang Chinese Medical University, 315 South Street, Wuxing Direct, Huzhou City, 313000 Zhejiang Province China
| | - Ming Lin
- The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Lucheng Direct, Wenzhou City, China
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6
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Yang LG, Wang AL, Li L, Yang H, Jie X, Zhu ZF, Zhang XJ, Zhao HP, Chi RF, Li B, Qin FZ, Wang JP, Wang K. Sphingosine-1-phosphate induces myocyte autophagy after myocardial infarction through mTOR inhibition. Eur J Pharmacol 2021; 907:174260. [PMID: 34144026 DOI: 10.1016/j.ejphar.2021.174260] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 06/05/2021] [Accepted: 06/07/2021] [Indexed: 11/22/2022]
Abstract
Sphingosine-1-phosphate (S1P)/S1P receptor 1 signaling exerts cardioprotective effects including inhibition of myocyte apoptosis. However, little is known about the effect of S1P treatment on myocyte autophagy after myocardial infarction (MI). In the present study, we tested the hypothesis that S1P induces myocyte autophagy through inhibition of the mammalian target of rapamycin (mTOR), leading to improvement of left ventricular (LV) function after MI. Sprague-Dawley rats underwent MI or sham operation. The animals were randomized to receive S1P (50 μg/kg/day, i.p.) or placebo for one week. H9C2 cardiomyocytes cultured in serum- and glucose-deficient medium were treated with or without S1P for 3 h. MI rats exhibited an increase in LV end-diastolic dimension (EDD) and decreases in LV fractional shortening (FS) and the maximal rate of LV pressure rise (+dP/dt). S1P treatment attenuated the increase in LV EDD and decreases in LV FS and +dP/dt. In the MI placebo group, the LC3 II/I ratio, a marker of autophagy, was increased, and increased further by S1P treatment. S1P also enhanced the autophagy-related proteins Atg4b and Atg5 after MI. Similarly, in cultured cardiomyocytes, autophagy was increased under glucose and serum deprivation, and increased further by S1P treatment. The effect of S1P on myocyte autophagy was associated with mTOR inhibition after MI or in cultured cardiomyocytes under glucose and serum deprivation. S1P treatment prevents LV remodeling, enhances myocyte autophagy and inhibits mTOR activity after MI. These findings suggest that S1P treatment induces myocyte autophagy through mTOR inhibition, leading to the attenuation of LV dysfunction after MI.
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Affiliation(s)
- Li-Guo Yang
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Provincial People's Hospital, Taiyuan, 030001, Shanxi, PR China
| | - Ai-Ling Wang
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Lu Li
- Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Hong Yang
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Xi Jie
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Zong-Feng Zhu
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Xiao-Juan Zhang
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Province Cardiovascular Hospital, Taiyuan, 030024, Shanxi, PR China
| | - Hui-Ping Zhao
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Rui-Fang Chi
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Bao Li
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
| | - Fu-Zhong Qin
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China.
| | - Jia-Pu Wang
- Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Province Cardiovascular Hospital, Taiyuan, 030024, Shanxi, PR China
| | - Ke Wang
- The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China; Shanxi Medical University, Taiyuan, 030001, Shanxi, PR China
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7
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Impact of Dietary Factors on Brugada Syndrome and Long QT Syndrome. Nutrients 2021; 13:nu13082482. [PMID: 34444641 PMCID: PMC8401538 DOI: 10.3390/nu13082482] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 07/16/2021] [Accepted: 07/19/2021] [Indexed: 12/14/2022] Open
Abstract
A healthy regime is fundamental for the prevention of cardiovascular diseases (CVD). In inherited channelopathies, such as Brugada syndrome (BrS) and Long QT syndrome (LQTS), unfortunately, sudden cardiac death could be the first sign for patients affected by these syndromes. Several known factors are used to stratify the risk of developing cardiac arrhythmias, although none are determinative. The risk factors can be affected by adjusting lifestyle habits, such as a particular diet, impacting the risk of arrhythmogenic events and mortality. To date, the importance of understanding the relationship between diet and inherited channelopathies has been underrated. Therefore, we describe herein the effects of dietary factors on the development of arrhythmia in patients affected by BrS and LQTS. Modifying the diet might not be enough to fully prevent arrhythmias, but it can help lower the risk.
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8
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Xu S, Tao H, Cao W, Cao L, Lin Y, Zhao SM, Xu W, Cao J, Zhao JY. Ketogenic diets inhibit mitochondrial biogenesis and induce cardiac fibrosis. Signal Transduct Target Ther 2021; 6:54. [PMID: 33558457 PMCID: PMC7870678 DOI: 10.1038/s41392-020-00411-4] [Citation(s) in RCA: 94] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 08/31/2020] [Accepted: 11/03/2020] [Indexed: 02/05/2023] Open
Abstract
In addition to their use in relieving the symptoms of various diseases, ketogenic diets (KDs) have also been adopted by healthy individuals to prevent being overweight. Herein, we reported that prolonged KD exposure induced cardiac fibrosis. In rats, KD or frequent deep fasting decreased mitochondrial biogenesis, reduced cell respiration, and increased cardiomyocyte apoptosis and cardiac fibrosis. Mechanistically, increased levels of the ketone body β-hydroxybutyrate (β-OHB), an HDAC2 inhibitor, promoted histone acetylation of the Sirt7 promoter and activated Sirt7 transcription. This in turn inhibited the transcription of mitochondrial ribosome-encoding genes and mitochondrial biogenesis, leading to cardiomyocyte apoptosis and cardiac fibrosis. Exogenous β-OHB administration mimicked the effects of a KD in rats. Notably, increased β-OHB levels and SIRT7 expression, decreased mitochondrial biogenesis, and increased cardiac fibrosis were detected in human atrial fibrillation heart tissues. Our results highlighted the unknown detrimental effects of KDs and provided insights into strategies for preventing cardiac fibrosis in patients for whom KDs are medically necessary.
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Affiliation(s)
- Sha Xu
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China.,Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, 610041, Chengdu, China
| | - Hui Tao
- Department of Cardiothoracic Surgery, Second Hospital of Anhui Medical University, and Cardiovascular Research Center, Anhui Medical University, 230601, Hefei, China
| | - Wei Cao
- Department of Cardiothoracic Surgery, Second Hospital of Anhui Medical University, and Cardiovascular Research Center, Anhui Medical University, 230601, Hefei, China
| | - Li Cao
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China
| | - Yan Lin
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China
| | - Shi-Min Zhao
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China.,Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, 610041, Chengdu, China
| | - Wei Xu
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China.,Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, 610041, Chengdu, China
| | - Jing Cao
- Department of Anatomy and Neuroscience Research Institute, School of Basic Medical Sciences, Zhengzhou University, 450001, Zhengzhou, China
| | - Jian-Yuan Zhao
- Zhongshan Hospital of Fudan University, Obstetrics & Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC, and Institutes of Biomedical Sciences, Fudan University, 200438, Shanghai, China. .,Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, 610041, Chengdu, China. .,Department of Anatomy and Neuroscience Research Institute, School of Basic Medical Sciences, Zhengzhou University, 450001, Zhengzhou, China.
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9
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Hellmich L, Witte KE, Ebinger M, Ulmer A. Flow Cytometry for Detection and Quantification of Micrometastases in Sentinel Lymph Nodes from Patients with Primary Melanoma. J Surg Res 2020; 257:477-485. [PMID: 32911437 DOI: 10.1016/j.jss.2020.08.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 05/01/2020] [Accepted: 08/02/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Detection of micrometastases in the regional lymph nodes is one of the most important prognostic factors for melanoma patients. Our aim was to evaluate the suitability of flow cytometry for rapid quantification of disseminated melanoma cells in sentinel lymph nodes (SLN). METHODS 132 SLNs from 104 patients diagnosed with melanoma were analyzed by flow cytometry, utilizing the extracellular marker melanoma-associated chondroitin sulfate proteoglycan, in addition to quantitative immunocytology and conventional histopathology, including immunohistochemistry. For quantification, the number of melanoma-positive cells per million lymph node cells (disseminated cancer cell density, DCCD) detected by flow cytometry was compared to the DCCD obtained by immunocytology. RESULTS Compared to histopathology and immunocytology, flow cytometry exhibited a sensitivity of 50% and a specificity of 85%. DCCDs of immunocytology and flow cytometry of the 37 immunocytologically positive SLNs showed a positive correlation (Spearman's ρ = 0.7, P < 0.0001). In 10 SLNs from 9 patients with high tumor load, the flow cytometric DCCD was 8-fold higher on average than the immunocytologic DCCD. CONCLUSIONS Although flow cytometry is not yet suitable for early detection of metastatic melanoma, it promises to become a valuable tool for rapidly quantifying tumor load in high-risk patients.
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Affiliation(s)
- Luisa Hellmich
- Department of Dermatology, University of Tuebingen, Tuebingen, Germany; Department of Dermatology, University of Cologne, Cologne, Germany.
| | - Kai-Erik Witte
- Department of General Pediatrics, Hematology/Oncology, University Children's Hospital Tuebingen, Tuebingen, Germany
| | - Martin Ebinger
- Department of General Pediatrics, Hematology/Oncology, University Children's Hospital Tuebingen, Tuebingen, Germany
| | - Anja Ulmer
- Department of Dermatology, University of Tuebingen, Tuebingen, Germany
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10
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Abdolmaleki A, Ghayour MB, Behnam-Rassouli M. Protective effects of acetyl-L-carnitine against serum and glucose deprivation-induced apoptosis in rat adipose-derived mesenchymal stem cells. Cell Tissue Bank 2020; 21:655-666. [PMID: 32564258 DOI: 10.1007/s10561-020-09844-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 06/16/2020] [Indexed: 02/02/2023]
Abstract
Low survival rate of grafted mesenchymal stem cells (MSC) in injured tissue is one of the major limitations of stem cell therapy. One of the most important factors that limits the MSCs survival rate and retention is ischemic stress, which can lead to damage to all components of the cell. In particular, it can damage mitochondria, that play an important role in apoptosis with releasing apoptotic factors. Therefore, we investigated the protective effects of Acetyl-L-carnitine (ALCAR) against serum and glucose deprivation (SGD) in adipose-derived mesenchymal stem cells (AD-MSCs). We measured cell viability, proliferation, and apoptosis in cells experiencing SGD stress for 8 h with exposure to varying concentrations of ALCAR. Results showed that ALCAR protects cells against SGD stress by reducing apoptosis. Its protective effects are associated with reductions in cleaved caspase-3 and attenuation of apoptosis. Result showed that ALCAR exhibits protective effects against SGD-induced damage to AD-MSCs by enhancing the expression of survival signals and by decreasing the expression of death signals.
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Affiliation(s)
- Arash Abdolmaleki
- Department of Engineering Sciences, Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Namin, Iran.,Bio Science and Biotechnology Research Center (BBRC), Sabalan University of Advanced Technologies (SUAT), Namin, Iran
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11
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Eukaryotic elongation factor 2 (eEF2) kinase/eEF2 plays protective roles against glucose deprivation-induced cell death in H9c2 cardiomyoblasts. Apoptosis 2020; 24:359-368. [PMID: 30737648 DOI: 10.1007/s10495-019-01525-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
During the development of cardiac hypertrophy, glucose deprivation (GD) associated with coronary microvascular rarefaction is caused, leading to cardiomyocyte death. Phosphorylation (inactivation) of eukaryotic elongation factor 2 (eEF2) by eEF2 kinase (eEF2K) inhibits protein translation, a highly energy consuming process, which plays protective roles against nutrient deprivation-induced cell death. We previously showed that eEF2 phosphorylation was increased in isolated heart from several cardiac hypertrophy models. In this study, we investigated whether eEF2K/eEF2 mediates the inhibition of cardiomyocyte death under GD condition. In H9c2 rat cardiomyoblasts cultured with serum-free medium, GD significantly augmented eEF2 phosphorylation and signals related to autophagy [increase of microtubule-associated protein 1 light chain 3 (LC3)-II to LC3-I ratio] and apoptosis (cleavage of caspase-3) as determined by Western blotting. GD induced cell death, which was augmented by eEF2K gene knockdown using a small interfering RNA. eEF2K gene knockdown significantly augmented GD-induced cleavage of caspase-3 and apoptotic nuclear condensation as determined by 4', 6-diamidino-2-phenylindole staining. In contrast, eEF2K gene knockdown significantly inhibited GD-induced increase of LC3-II to LC3-I ratio and autophagosome formation as determined by an immunofluorescence staining. An inhibitor of autophagy, 3-methyladenine or bafilomycin A1 significantly augmented GD-induced cleavage of caspase-3. Further, eEF2K gene knockdown significantly inhibited GD-induced phosphorylation of adenosine monophosphate-activated protein kinase (AMPK)α and its downstream substrate, unc-51 like autophagy activating kinase (ULK)1. An inhibitor of AMPK, dorsomorphin significantly inhibited GD-induced increase of LC3-II to LC3-I ratio. In conclusion, we for the first time revealed that eEF2K/eEF2 axis under GD condition mediates the inhibition of apoptotic H9c2 cell death at least in part via promotion of autophagy through AMPKα/ULK1 signaling pathway.
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Kulek AR, Anzell A, Wider JM, Sanderson TH, Przyklenk K. Mitochondrial Quality Control: Role in Cardiac Models of Lethal Ischemia-Reperfusion Injury. Cells 2020; 9:cells9010214. [PMID: 31952189 PMCID: PMC7016592 DOI: 10.3390/cells9010214] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/10/2020] [Accepted: 01/12/2020] [Indexed: 02/07/2023] Open
Abstract
The current standard of care for acute myocardial infarction or 'heart attack' is timely restoration of blood flow to the ischemic region of the heart. While reperfusion is essential for the salvage of ischemic myocardium, re-introduction of blood flow paradoxically kills (rather than rescues) a population of previously ischemic cardiomyocytes-a phenomenon referred to as 'lethal myocardial ischemia-reperfusion (IR) injury'. There is long-standing and exhaustive evidence that mitochondria are at the nexus of lethal IR injury. However, during the past decade, the paradigm of mitochondria as mediators of IR-induced cardiomyocyte death has been expanded to include the highly orchestrated process of mitochondrial quality control. Our aims in this review are to: (1) briefly summarize the current understanding of the pathogenesis of IR injury, and (2) incorporating landmark data from a broad spectrum of models (including immortalized cells, primary cardiomyocytes and intact hearts), provide a critical discussion of the emerging concept that mitochondrial dynamics and mitophagy (the components of mitochondrial quality control) may contribute to the pathogenesis of cardiomyocyte death in the setting of ischemia-reperfusion.
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Affiliation(s)
- Andrew R. Kulek
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA; (A.R.K.); (A.A.); (T.H.S.)
- Department of Biochemistry, Microbiology and Immunology, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Anthony Anzell
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA; (A.R.K.); (A.A.); (T.H.S.)
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI 48201, USA
- Departments of Emergency Medicine and Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA;
| | - Joseph M. Wider
- Departments of Emergency Medicine and Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA;
| | - Thomas H. Sanderson
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA; (A.R.K.); (A.A.); (T.H.S.)
- Departments of Emergency Medicine and Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA;
| | - Karin Przyklenk
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA; (A.R.K.); (A.A.); (T.H.S.)
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI 48201, USA
- Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, MI 48201, USA
- Correspondence: ; Tel.: +1-313-577-9047
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Yang B, Zheng C, Yu H, Zhang R, Zhao C, Cai S. Cardio-protective effects of salvianolic acid B on oxygen and glucose deprivation (OGD)-treated H9c2 cells. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:2274-2281. [PMID: 31184214 DOI: 10.1080/21691401.2019.1621885] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The morphological feature of apoptosis is induced by oxygen and glucose deprivation (OGD) in cardiomyocytes H9c2 cells. Salvianolic acid B (Sal-B) has been studied in several pathological progresses, whereas it is still unclear whether maternally expressed gene 3 (MEG3) is an intermediate regulator during this progress. After pre-incubation with Sal-B and stimulation with OGD, viability and apoptosis of were examined in MEG3-overexpressed H9c2 cells. Cyclin D1, apoptosis-correlated proteins and regulators of signalling pathways were quantified with Western blot assay. MEG3 was detected by quantitative reverse transcription PCR (qRT-PCR). Sal-B was implicated in the enhancement of cell viability and suppression of apoptosis in OGD-treated H9c2 cells by repressing MEG3. In addition, MEG3 overexpression exerted an inhibitory effect on murine double minute 2 (MDM2) expression while aggrandized p53 expression in OGD-treated H9c2 cells which were pre-incubated with Sal-B. Furthermore, MEG3 overexpression abolished the up-regulative effect of Sal-B on phosphorylation of adenosine monophosphate-activated protein kinase (AMPK) in OGD-treated H9c2 cells. These results indicated that cardio-protective function of Sal-B might be ascribed to its down-regulatory property on MEG3 expression which hence blocks p53 and triggers AMPK activation in OGD-treated cells.
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Affiliation(s)
- Bin Yang
- a Department of Cardiology, The Affiliated Hospital of Qingdao University , Qingdao , China
| | - Chunyan Zheng
- b Medical Consultation Center, The Affiliated Hospital of Qingdao University , Qingdao , China
| | - Haichu Yu
- a Department of Cardiology, The Affiliated Hospital of Qingdao University , Qingdao , China
| | - Rui Zhang
- a Department of Cardiology, The Affiliated Hospital of Qingdao University , Qingdao , China
| | - Cong Zhao
- a Department of Cardiology, The Affiliated Hospital of Qingdao University , Qingdao , China
| | - Shanglang Cai
- a Department of Cardiology, The Affiliated Hospital of Qingdao University , Qingdao , China
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Subbiah KS, Beedu SR. Biogenic synthesis of biopolymer-based Ag-Au bimetallic nanoparticle constructs and their anti-proliferative assessment. IET Nanobiotechnol 2019; 12:1047-1055. [PMID: 30964012 DOI: 10.1049/iet-nbt.2018.5135] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
This study reports an eco-friendly-based method for the preparation of biopolymer Ag-Au nanoparticles (NPs) by using gum kondagogu (GK; Cochlospermum gossypium), as both reducing and protecting agent. The formation of GK-(Ag-Au) NPs was confirmed by UV-absorption, fourier transformed infrared (FTIR), atomic force microscopy (AFM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The GK-(Ag-Au) NPs were of 1-12 nm in size. The anti-proliferative activity of nanoparticle constructs was assessed by MTT assay, confocal microscopy, flow cytometry and quantitative real-time polymerase chain reaction (PCR) techniques. Expression studies revealed up-regulation of p53, caspase-3, caspase-9, peroxisome proliferator-activated receptors (PPAR) PPARa and PPARb, genes and down-regulation of Bcl-2 and Bcl-x(K) genes, in B16F10 cells treated with GK-(Ag-Au) NPs confirming the anti-proliferative properties of the nanoparticles.
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Affiliation(s)
- Kalaignana Selvi Subbiah
- Department of Biochemistry, University College of Science, Osmania University, Hyderabad 500 007, Telangana, India
| | - Sashidhar Rao Beedu
- Department of Biochemistry, University College of Science, Osmania University, Hyderabad 500 007, Telangana, India.
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15
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Shi L, Ye L, Liu P, Liu D, Ye G, Chen J, Dong Z. Ulinastatin inhibits apoptosis induced by serum deprivation in mesenchymal stem cells. Mol Med Rep 2019; 19:2397-2406. [PMID: 30664153 DOI: 10.3892/mmr.2019.9847] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 10/10/2018] [Indexed: 11/06/2022] Open
Abstract
Mesenchymal stem cells (MSCs) have exhibited great potential in the therapy of cardiovascular disease. However, the application of MSCs is hampered by apoptosis, which reduces the number of cells in the host cardiac microenvironment. Ulinastatin (UTI), a broad‑spectrum protease inhibitor that can be purified from human urine, has attracted attention for its protective effects through its immunomodulatory and anti‑inflammatory properties. The present study aimed to evaluate the effects of UTI on serum deprivation‑induced apoptosis of MSCs and investigate its molecular mechanisms. Cell viability was determined by the MTT assay. Apoptosis was assessed by flow cytometric analysis with Annexin V/propidium iodide staining. The protein levels of cleaved caspase‑3, B‑cell lymphoma‑2 (Bcl‑2) family proteins, total‑Akt and phospho‑Akt were evaluated by western blot. The results of the present study demonstrated that UTI exhibited a protective effect in serum deprived MSCs, as indicated by increased cell viability, and a reduction in the rate of apoptosis and caspase‑3 activation. In addition, treatment with UTI significantly decreased the expression levels of Bcl‑2, Bcl‑extra large and Bcl‑associated X protein. Furthermore, activation of the Akt signaling pathway was involved in the UTI‑induced anti‑apoptotic effects. The present findings indicated that UTI is able to promote the survival of MSCs under serum deprivation conditions. The present study may be helpful in improving the therapeutic efficacy of MSC transplantation used to cure chronic ischemic heart disease.
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Affiliation(s)
- Linhui Shi
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Longqiang Ye
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Panpan Liu
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Danqin Liu
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Gongjie Ye
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Jiahong Chen
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
| | - Zhouzhou Dong
- Critical Care Unit, Ningbo Medical Center Lihuili Eastern Hospital, Taipei Medical University Ningbo Medical Center, Ningbo, Zhejiang 315040, P.R. China
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Cesarini E, Cerioni L, Canonico B, Di Sario G, Guidarelli A, Lattanzi D, Savelli D, Guescini M, Nasoni MG, Bigini N, Cuppini R, Stocchi V, Ambrogini P, Papa S, Luchetti F. Melatonin protects hippocampal HT22 cells from the effects of serum deprivation specifically targeting mitochondria. PLoS One 2018; 13:e0203001. [PMID: 30157259 PMCID: PMC6114848 DOI: 10.1371/journal.pone.0203001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/13/2018] [Indexed: 02/07/2023] Open
Abstract
Neurons contain a high number of mitochondria, these neuronal cells produce elevated levels of oxidative stress and live for a long time without proliferation; therefore, mitochondrial homeostasis is crucial to their health. Investigations have recently focused on mitochondrial dynamics revealing the ability of these organelles to change their distribution and morphology. It is known that mitochondrial fission is necessary for the transmission of mitochondria to daughter cells during mitosis and mitochondrial fragmentation has been used as an indicator of cell death and mitochondrial dysfunction. Oxidative stress is a trigger able to induce changes in the mitochondrial network. The aim of the present study was to determine the effects of melatonin on the mitochondrial network in HT22 serum-deprived cells. Our results showed that serum deprivation increased reactive oxygen species (ROS) content, promoted the activation of plasma membrane voltage-dependent anion channels (VDACs) and affected the expression of pDRP1 and DRP1 fission proteins. Moreover, parallel increases in apoptotic and autophagic features were found. Damaged and dysfunctional mitochondria are deleterious to the cell; hence, the degradation of such mitochondria through mitophagy is crucial to cell survival. Our results suggest that melatonin supplementation reduces cell death and restores mitochondrial function through the regulation of autophagy.
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Affiliation(s)
- Erica Cesarini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Liana Cerioni
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Barbara Canonico
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Gianna Di Sario
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Andrea Guidarelli
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Davide Lattanzi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - David Savelli
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Michele Guescini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Maria Gemma Nasoni
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Noemi Bigini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Riccardo Cuppini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Vilberto Stocchi
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Patrizia Ambrogini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Stefano Papa
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
| | - Francesca Luchetti
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, Italy
- * E-mail:
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Short-Duration Swimming Exercise after Myocardial Infarction Attenuates Cardiac Dysfunction and Regulates Mitochondrial Quality Control in Aged Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:4079041. [PMID: 29849892 PMCID: PMC5925211 DOI: 10.1155/2018/4079041] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/21/2017] [Accepted: 01/24/2018] [Indexed: 12/27/2022]
Abstract
Background Exercise benefits to cardiac rehabilitation (CR) following stable myocardial infarction (MI). The suitable exercise duration for aged patients with coronary heart disease (CHD) remains controversial, and the underlying molecular mechanism is still unclear. Methods and Results 18-Month-old mice after stable MI were randomly submitted to different durations of exercise, including 15 and 60 min swimming training (ST) once per day, five times a week for 8 weeks. Compared to sedentary mice, 15 min ST, rather than 60 min ST, significantly augmented left ventricular function, increased survival rate, and suppressed myocardial fibrosis and apoptosis. 15 min ST improved mitochondrial morphology via regulating mitochondrial fission-fusion signaling. 15 min ST regulated mitophagy signaling via inhibiting LC3-II and P62 levels and increasing PINK/Parkin expression. 15 min ST also inhibited ROS production and enhanced antioxidant SOD2 activity. Notably, 15 min ST significantly increased sirtuin (SIRT) 3 level (2.7-fold) in vivo while the inhibition of SIRT3 exacerbated senescent H9c2 cellular LDH release and ROS production under hypoxia. In addition, SIRT3 silencing impairs mitochondrial dynamics and mitophagy in senescent cardiomyocytes against simulated ischemia (SI) injury. Conclusion Collectively, our study demonstrated for the first time that sustained short-duration exercise, rather than long-duration exercise, attenuates cardiac dysfunction after MI in aged mice. It is likely that the positive regulation induced by a short-duration ST regimen on the elevated SIRT3 protein level improved mitochondrial quality control and decreased apoptosis and fibrosis contributed to the observed more resistant phenotype.
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Kalaignana Selvi S, Mahesh Kumar J, Sashidhar R. Anti-proliferative activity of Gum kondagogu ( Cochlospermum gossypium )-gold nanoparticle constructs on B16F10 melanoma cells: An in vitro model. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.bcdf.2017.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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19
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Wahdan SA, Tadros MG, Khalifa AE. Antioxidant and antiapoptotic actions of selegiline protect against 3-NP-induced neurotoxicity in rats. Naunyn Schmiedebergs Arch Pharmacol 2017. [DOI: 10.1007/s00210-017-1392-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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20
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Wang S, Zhang C, Niyazi S, Zheng L, Li J, Zhang W, Xu M, Rong R, Yang C, Zhu T. A novel cytoprotective peptide protects mesenchymal stem cells against mitochondrial dysfunction and apoptosis induced by starvation via Nrf2/Sirt3/FoxO3a pathway. J Transl Med 2017; 15:33. [PMID: 28202079 PMCID: PMC5309997 DOI: 10.1186/s12967-017-1144-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/08/2017] [Indexed: 01/11/2023] Open
Abstract
Background Mesenchymal stem cell (MSC) has been widely explored in the past decade as a cell-based treatment for various diseases. However, poor survival of adaptively transferred MSCs limits their clinical therapeutic potentials, which is largely ascribed to the nutrient starvation. In this study, we determined whether a novel kidney protective peptide CHBP could protect MSCs against starvation and invested the underlying mechanisms. Methods MSCs were subjected to serum deprivation and CHBP of graded concentrations was administered. Cell viability and apoptosis were detected by CCK-8, Annexin V/PI assay and Hoechst staining. ROS generation, mitochondrial membrane potential indicated by JC-1 and mitochondrial mass were measured by flow cytometry. The location of cytochrome c within cells was observed under fluorescence microscopy. Expressions of Nrf2, Sirt3, and FoxO3a were analyzed by western blot. In addition, preconditioning MSCs with CHBP was applied to test the possible protection against starvation. Finally, the effect of CHBP on the differentiation and self-renewal capacity of MSCs was also examined. Results CHBP improved cell viability and suppressed apoptosis in a dose dependent manner. Starvation resulted in the mitochondrial dysfunction and treatment of CHBP could alleviate mitochondrial stress by diminishing oxidative injury of ROS, restoring mitochondrial membrane potential and maintaining mitochondrial membrane integrity. Importantly, Nrf2/Sirt3/FoxO3a pathway was activated by CHBP and Sirt3 knockdown partially abolished the protection of CHBP. Moreover, MSCs pretreated with CHBP were more resistant to starvation. Under normal condition, CHBP exerted little effects on the differential and self-renewal capacity of MSCs. Conclusions The present study demonstrated the efficient protection of CHBP upon MSCs against starvation-induced mitochondrial dysfunction and apoptosis and indicated possible involvement of Nrf2/Sirt3/FoxO3a pathway in the protective effect.
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Affiliation(s)
- Shuo Wang
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Chao Zhang
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Sidikejiang Niyazi
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Long Zheng
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Jiawei Li
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Weitao Zhang
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Ming Xu
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China
| | - Ruiming Rong
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China.,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China.,Department of Transfusion, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Cheng Yang
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China. .,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China.
| | - Tongyu Zhu
- Department of Urology, Zhongshan Hospital, Fudan University, 180 Fenglin Road, Shanghai, 200032, China. .,Shanghai Key Laboratory of Organ Transplantation, Shanghai, China. .,Shanghai Public Health Clinical Center, Fudan University, Shanghai, China.
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Myricitrin Protects against Doxorubicin-Induced Cardiotoxicity by Counteracting Oxidative Stress and Inhibiting Mitochondrial Apoptosis via ERK/P53 Pathway. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 2016:6093783. [PMID: 27703489 PMCID: PMC5039279 DOI: 10.1155/2016/6093783] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 05/08/2016] [Accepted: 06/05/2016] [Indexed: 12/20/2022]
Abstract
Doxorubicin (Dox) is one of the most effective and widely used anthracycline antineoplastic antibiotics. Unfortunately, the use of Dox is limited by its cumulative and dose-dependent cardiac toxicity. Myricitrin, a natural flavonoid which is isolated from the ground bark of Myrica rubra, has recently been found to have a strong antioxidative effect. This study aimed to evaluate the possible protective effect of myricitrin against Dox-induced cardiotoxicity and the underlying mechanisms. An in vivo investigation in SD rats demonstrated that myricitrin significantly reduced the Dox-induced myocardial damage, as indicated by the decreases in the cardiac index, amelioration of heart pathological injuries, and decreases in the serum cardiac enzyme levels. In addition, in vitro studies showed that myricitrin effectively reduced the Dox-induced cell toxicity. Further study showed that myricitrin exerted its function by counteracting oxidative stress and increasing the activities of antioxidant enzymes. Moreover, myricitrin suppressed the myocardial apoptosis induced by Dox, as indicated by decreases in the activation of caspase-3 and the numbers of TUNEL-positive cells, maintenance of the mitochondrial membrane potential, and increase in the Bcl-2/Bax ratio. Further mechanism study revealed that myricitrin-induced suppression of myocardial apoptosis relied on the ERK/p53-mediated mitochondrial apoptosis pathway.
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22
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Ng HY, Ko JMY, Yu VZ, Ip JCY, Dai W, Cal S, Lung ML. DESC1, a novel tumor suppressor, sensitizes cells to apoptosis by downregulating the EGFR/AKT pathway in esophageal squamous cell carcinoma. Int J Cancer 2016; 138:2940-51. [PMID: 26856390 DOI: 10.1002/ijc.30034] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 02/01/2016] [Indexed: 02/06/2023]
Abstract
Esophageal cancer is ranked as the eighth most common cancer and the sixth leading cause of cancer deaths worldwide. To identify candidate tumor suppressor genes related to esophageal squamous cell carcinoma (ESCC) development, a cDNA microarray analysis was performed using paired tumor and nontumor tissue samples from ESCC patients. Differentially expressed in squamous cell carcinoma 1 (DESC1), which belongs to the Type II transmembrane serine protease family, was frequently downregulated in ESCC. This study aims to elucidate the molecular mechanism for the tumor suppressive function of DESC1 in ESCC. We show that DESC1 reduced cell viability and sensitized cells to apoptosis, when cells were under apoptotic stimuli. The proapoptotic effect of DESC1 was mediated through downregulating AKT1 activation and the restoration of AKT activation by the introduction of the constitutively active AKT, myr-AKT, abolished the apoptosis-sensitizing effect of DESC1. DESC1 also reduced EGFR protein level, which was abrogated when the proteolytic function of DESC1 was lost, suggesting that DESC1 cleaved EGFR and downregulated the EGFR/AKT pathway to favor apoptosis. The transmembrane localization and the structural domains provide an opportunity for DESC1 to interact with the extracellular environment. The importance of such interaction was highlighted by the finding that DESC1 reduced cell colony formation ability in three-dimensional culture. In line with this, DESC1 reduced tumor growth kinetics in the in vivo orthotopic tumorigenesis assay. Taken together, our novel findings suggest how DESC1 may suppress ESCC development by sensitizing cells to apoptosis under an apoptotic stimulus through downregulating the EGFR/AKT signaling pathway.
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Affiliation(s)
- Hoi Yan Ng
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
| | - Josephine Mun-Yee Ko
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
| | - Valen Zhuoyou Yu
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
| | - Joseph Chok Yan Ip
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
| | - Wei Dai
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
| | - Santiago Cal
- Departamento De Bioquímica Y Biología Molecular, Instituto Universitario De Oncología, Universidad De Oviedo, Spain
| | - Maria Li Lung
- Department of Clinical Oncology, Faculty of Medicine, University of Hong Kong Li Ka Shing, Pokfulam, Hong Kong, SAR
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Mattiolo P, Yuste VJ, Boix J, Ribas J. Autophagy exacerbates caspase-dependent apoptotic cell death after short times of starvation. Biochem Pharmacol 2015; 98:573-86. [PMID: 26441250 DOI: 10.1016/j.bcp.2015.09.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 09/29/2015] [Indexed: 12/19/2022]
Abstract
Autophagy is generally regarded as a mechanism to promote cell survival. However, autophagy can occasionally be the mechanism responsible of cell demise. We have found that a concomitant depletion of glucose, nutrients and growth factors provoked cell death in a variety of cell lines. This death process was contingent upon caspase activation and was mediated by BAX/BAK proteins, thus indicating its apoptotic nature and the engagement of an intrinsic pathway. In order to abrogate autophagy, 3-methyladenine (3-MA), BECLIN-1 siRNA and Atg5 knock-out (Tet-Off type) approaches were alternatively employed. Irrespective of the procedure, at short times of starvation, we found that the ongoing autophagy was sensitizing cells to the permeabilization of the mitochondrial outer membrane (MOMP), caspase activation and, therefore, apoptosis. On the contrary, at longer times of starvation, autophagy displayed its characteristic pro-survival effect on cells. As far as we know, we provide the first experimental paradigm where time is the only variable determining the final outcome of autophagy. In other words, we have circumscribed in time the shift transforming autophagy from a cell death to a protection mechanism. Moreover, at short times, starvation-driven autophagy exacerbated the apoptotic cell death caused by several antitumor agents. In agreement with this fact, their apoptotic effects were greatly diminished by autophagy inhibition. The implications of these facts in tumor biology will be discussed.
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Affiliation(s)
- Paolo Mattiolo
- Cell Death Regulation by Non-coding RNAs (ncRNAs) Group, Departament de Medicina Experimental, Universitat de Lleida/IRBLleida, Av. Rovira Roure 80, E-25198 Lleida, Spain; Pharmacology Unit, Departament de Medicina Experimental, Universitat de Lleida/IRBLleida, Av. Rovira Roure 80, E-25198 Lleida, Spain
| | - Victor J Yuste
- Cell Death, Senescence and Survival Group, Departament de Bioquímica i Biologia Molecular & Institut de Neurociències, Facultat de Medicina, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - Jacint Boix
- Pharmacology Unit, Departament de Medicina Experimental, Universitat de Lleida/IRBLleida, Av. Rovira Roure 80, E-25198 Lleida, Spain
| | - Judit Ribas
- Cell Death Regulation by Non-coding RNAs (ncRNAs) Group, Departament de Medicina Experimental, Universitat de Lleida/IRBLleida, Av. Rovira Roure 80, E-25198 Lleida, Spain; Pharmacology Unit, Departament de Medicina Experimental, Universitat de Lleida/IRBLleida, Av. Rovira Roure 80, E-25198 Lleida, Spain.
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Shi T, Papay RS, Perez DM. α1A-Adrenergic receptor prevents cardiac ischemic damage through PKCδ/GLUT1/4-mediated glucose uptake. J Recept Signal Transduct Res 2015; 36:261-70. [PMID: 26832303 DOI: 10.3109/10799893.2015.1091475] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
While α(1)-adrenergic receptors (ARs) have been previously shown to limit ischemic cardiac damage, the mechanisms remain unclear. Most previous studies utilized low oxygen conditions in addition to ischemic buffers with glucose deficiencies, but we discovered profound differences if the two conditions are separated. We assessed both mouse neonatal and adult myocytes and HL-1 cells in a series of assays assessing ischemic damage under hypoxic or low glucose conditions. We found that α(1)-AR stimulation protected against increased lactate dehydrogenase release or Annexin V(+) apoptosis under conditions that were due to low glucose concentration not to hypoxia. The α(1)-AR antagonist prazosin or nonselective protein kinase C (PKC) inhibitors blocked the protective effect. α(1)-AR stimulation increased (3)H-deoxyglucose uptake that was blocked with either an inhibitor to glucose transporter 1 or 4 (GLUT1 or GLUT4) or small interfering RNA (siRNA) against PKCδ. GLUT1/4 inhibition also blocked α(1)-AR-mediated protection from apoptosis. The PKC inhibitor rottlerin or siRNA against PKCδ blocked α(1)-AR stimulated GLUT1 or GLUT4 plasma membrane translocation. α(1)-AR stimulation increased plasma membrane concentration of either GLUT1 or GLUT4 in a time-dependent fashion. Transgenic mice overexpressing the α(1A)-AR but not α(1B)-AR mice displayed increased glucose uptake and increased GLUT1 and GLUT4 plasma membrane translocation in the adult heart while α(1A)-AR but not α(1B)-AR knockout mice displayed lowered glucose uptake and GLUT translocation. Our results suggest that α(1)-AR activation is anti-apoptotic and protective during cardiac ischemia due to glucose deprivation and not hypoxia by enhancing glucose uptake into the heart via PKCδ-mediated GLUT translocation that may be specific to the α(1A)-AR subtype.
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Affiliation(s)
- Ting Shi
- a Department of Molecular Cardiology , Lerner Research Institute, Cleveland Clinic Foundation , Cleveland , OH , USA
| | - Robert S Papay
- a Department of Molecular Cardiology , Lerner Research Institute, Cleveland Clinic Foundation , Cleveland , OH , USA
| | - Dianne M Perez
- a Department of Molecular Cardiology , Lerner Research Institute, Cleveland Clinic Foundation , Cleveland , OH , USA
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Mirzamohammadi S, Mehrabani M, Tekiyehmaroof N, Sharifi AM. Protective effect of 17β-estradiol on serum deprivation-induced apoptosis and oxidative stress in bone marrow-derived mesenchymal stem cells. Hum Exp Toxicol 2015; 35:312-22. [PMID: 25964380 DOI: 10.1177/0960327115586208] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Stem cell transplantation has indicated great promise for cell therapy in a wide range of diseases, but poor and insufficient viability of cells within damaged tissues has limited its potential therapeutic effects. 17 β-Estradiol (E2) is a steroid hormone that plays an important role in expression of many genes and regulating proliferation, viability, and intracellular redox status in different cell types. In this study, we aimed to assess the effect of E2 on bone marrow-derived mesenchymal stem cells (BM-MSCs). Apoptosis was induced by serum deprivation (SD), and cells were exposed to E2 in the presence or absence of serum for varying periods of time, after which cell viability was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Expression of proapoptotic and antiapoptotic proteins after exposure to E2 was examined by Western blotting. The ability of E2 to prevent reactive oxygen species (ROS) production was also measured. The results indicated that E2 significantly enhanced the viability of the cells and protected BM-MSCs against SD-induced overproduction of ROS. It could reduce lipid peroxidation, total antioxidant power, and also Bax/Bcl-2 ratio as well as expression of caspase-3. Taken together, our data support that E2 treatment protects BM-MSCs against SD-induced damage by regulating ROS production and upregulation of antiapoptotic/proapoptotic proteins ratio.
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Affiliation(s)
- S Mirzamohammadi
- Razi Drug Research Center, Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - M Mehrabani
- Razi Drug Research Center, Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - N Tekiyehmaroof
- Razi Drug Research Center, Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - A M Sharifi
- Razi Drug Research Center, Department of Pharmacology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran Department of Tissue Engineering and Regenerative Medicine, School of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
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Brodarac A, Šarić T, Oberwallner B, Mahmoodzadeh S, Neef K, Albrecht J, Burkert K, Oliverio M, Nguemo F, Choi YH, Neiss WF, Morano I, Hescheler J, Stamm C. Susceptibility of murine induced pluripotent stem cell-derived cardiomyocytes to hypoxia and nutrient deprivation. Stem Cell Res Ther 2015; 6:83. [PMID: 25900017 PMCID: PMC4445302 DOI: 10.1186/s13287-015-0057-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 05/23/2014] [Accepted: 03/19/2015] [Indexed: 01/06/2023] Open
Abstract
Introduction Induced pluripotent stem cell-derived cardiomyocytes (iPS-CMs) may be suitable for myocardial repair. While their functional and structural properties have been extensively investigated, their response to ischemia-like conditions has not yet been clearly defined. Methods iPS-CMs were differentiated and enriched from murine induced pluripotent stem cells expressing enhanced green fluorescent protein (eGFP) and puromycin resistance genes under the control of an α-myosin heavy chain (α-MHC) promoter. iPS-CMs maturity and function were characterized by microscopy, real-time PCR, calcium transient recordings, electrophysiology, and mitochondrial function assays, and compared to those from neonatal murine cardiomyocytes. iPS-CMs as well as neonatal murine cardiomyocytes were exposed for 3 hours to hypoxia (1% O2) and glucose/serum deprivation, and viability, apoptosis markers, reactive oxygen species, mitochondrial membrane potential and intracellular stress signaling cascades were investigated. Then, the iPS-CMs response to mesenchymal stromal cell-conditioned medium was determined. Results iPS-CMs displayed key morphological and functional properties that were comparable to those of neonatal cardiomyocytes, but several parameters indicated an earlier iPS-CMs maturation stage. During hypoxia and glucose/serum deprivation, iPS-CMs exhibited a significantly higher proportion of poly-caspase-active, 7-aminoactinomycin D-positive and TUNEL-positive cells than neonatal cardiomyocytes. The average mitochondrial membrane potential was reduced in “ischemic” iPS-CMs but remained unchanged in neonatal cardiomyocytes; reactive oxygen species production was only increased in “ischemic” iPS-CMs, and oxidoreductase activity in iPS-CMs dropped more rapidly than in neonatal cardiomyocytes. In iPS-CMs, hypoxia and glucose/serum deprivation led to upregulation of Hsp70 transcripts and decreased STAT3 phosphorylation and total PKCε protein expression. Treatment with mesenchymal stromal cell-conditioned medium preserved oxidoreductase activity and restored pSTAT3 and PKCε levels. Conclusion iPS-CMs appear to be particularly sensitive to hypoxia and nutrient deprivation. Counteracting the ischemic susceptibility of iPS-CMs with mesenchymal stromal cell-conditioned medium may help enhance their survival and efficacy in cell-based approaches for myocardial repair.
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Affiliation(s)
- Andreja Brodarac
- Berlin-Brandenburg Center for Regenerative Therapies, Föhrer Str.15, Berlin, 13353, Germany.
| | - Tomo Šarić
- Center for Physiology and Pathophysiology, Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Barbara Oberwallner
- Berlin-Brandenburg Center for Regenerative Therapies, Föhrer Str.15, Berlin, 13353, Germany.
| | | | - Klaus Neef
- Department of Cardiothoracic Surgery, Heart Center, University Hospital Cologne, Cologne, Germany.
| | - Julie Albrecht
- Center for Physiology and Pathophysiology, Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Karsten Burkert
- Center for Physiology and Pathophysiology, Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Matteo Oliverio
- Max-Planck-Institute for Metabolism Research, Cologne, Germany.
| | - Filomain Nguemo
- Center for Physiology and Pathophysiology, Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Yeong-Hoon Choi
- Department of Cardiothoracic Surgery, Heart Center, University Hospital Cologne, Cologne, Germany.
| | - Wolfram F Neiss
- Department of Anatomy I, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Ingo Morano
- Max-Delbrueck-Center for Molecular Medicine, Berlin, Germany.
| | - Jürgen Hescheler
- Center for Physiology and Pathophysiology, Institute for Neurophysiology, Medical Faculty, University of Cologne, Cologne, Germany.
| | - Christof Stamm
- Berlin-Brandenburg Center for Regenerative Therapies, Föhrer Str.15, Berlin, 13353, Germany. .,Deutsches Herzzentrum Berlin, Berlin, Germany.
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Ghorbani A, Sadeghnia HR, Asadpour E. Mechanism of protective effect of lettuce against glucose/serum deprivation-induced neurotoxicity. Nutr Neurosci 2015; 18:103-9. [PMID: 24621063 DOI: 10.1179/1476830513y.0000000107] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
OBJECTIVES The present study investigated the protective effect of ethyl acetate fraction of lettuce (Lactuca sativa) against glucose/serum deprivation (GSD)-induced neurotoxicity, a model which simulates neuronal damage during ischemia. METHODS Two neuron-like cells, N2a and PC12, were cultivated for 12 hours in GSD condition in the absence or presence of the lettuce fraction. The cell viability, DNA damage, and proapoptotic or antiapoptotic proteins levels were determined using MTT, comet, and immunoblotting assays, respectively. In addition, the intracellular reactive oxygen species and lipid peroxidation levels were measured by fluorimetric methods. RESULTS In both N2a and PC12 cells, GSD condition significantly decreased the cell viability which was accompanied by increased intracellular reactive oxygen species production, lipid peroxidation level, and oxidative DNA damage. All the GSD-induced neurotoxic changes were inhibited by the lettuce fraction. Lettuce also suppressed the elevated Bax and caspase-3 proteins and decreased Bcl-2 induced by GSD in PC12 cells. DISCUSSION The present study revealed that lettuce exerts neuroprotective effect through decrease of oxidative stress and inhibition of proapoptotic pathways. Therefore, it has the potential to be used for the management of ischemia-induced neuronal damage.
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28
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Annibaldi A, Heulot M, Martinou JC, Widmann C. TAT-RasGAP317-326-mediated tumor cell death sensitization can occur independently of Bax and Bak. Apoptosis 2015; 19:719-33. [PMID: 24362790 DOI: 10.1007/s10495-013-0958-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The increase of cancer specificity and efficacy of anti-tumoral agents are prime strategies to overcome the deleterious side effects associated with anti-cancer treatments. We described earlier a cell-permeable protease-resistant peptide derived from the p120 RasGAP protein, called TAT-RasGAP317-326, as being an efficient tumor-specific sensitizer to apoptosis induced by genotoxins in vitro and in vivo. Bcl-2 family members regulate the intrinsic apoptotic response and as such could be targeted by TAT-RasGAP317-326. Our results indicate that the RasGAP-derived peptide increases cisplatin-induced Bax activation. We found no evidence, using in particular knock-out cells, of an involvement of other Bcl-2 family proteins in the tumor-specific sensitization activity of TAT-RasGAP317-326. The absence of Bax and Bak in mouse embryonic fibroblasts rendered them resistant to cisplatin-induced apoptosis and consequently to the sensitizing action of the RasGAP-derived peptide. Surprisingly, in the HCT116 colon carcinoma cell line, the absence of Bax and Bak did not prevent cisplatin-induced apoptosis and the ability of TAT-RasGAP317-326 to augment this response. Our study also revealed that p53, while required for an efficient genotoxin-induced apoptotic response, is dispensable for the ability of the RasGAP-derived peptide to improve the capacity of genotoxins to decrease long-term survival of cancer cells. Hence, even though genotoxin-induced Bax activity can be increased by TAT-RasGAP317-326, the sensitizing activity of the RasGAP-derived peptide can operate in the absence of a functional mitochondrial intrinsic death pathway.
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Affiliation(s)
- Alessandro Annibaldi
- Department of Physiology, University of Lausanne, Rue du Bugnon 7, 1005, Lausanne, Switzerland
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29
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Effect of serum and oxygen concentration on gene expression and secretion of paracrine factors by mesenchymal stem cells. Int J Cell Biol 2014; 2014:601063. [PMID: 25614742 PMCID: PMC4295344 DOI: 10.1155/2014/601063] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/31/2014] [Accepted: 12/05/2014] [Indexed: 01/09/2023] Open
Abstract
Mesenchymal stem cells (MSC) secrete paracrine factors that may exert a protective effect on the heart after coronary artery occlusion. This study was done to determine the effect of hypoxia and serum levels on the mRNA expression and secretion of paracrine factors. Mouse bone marrow MSC were cultured with 5% or 20% serum and in either normoxic (21% O2) or hypoxic (1% O2) conditions. Expression of mRNA for vascular endothelial growth factor (VEGF), monocyte chemotactic protein-1 (MCP-1), macrophage inflammatory protein-1α (MIP-1α), MIP-1β, and matrix metalloproteinase-2 (MMP-2) was determined by RT-qPCR. Secretion into the culture media was determined by ELISA. Hypoxia caused a reduction in gene expression for MCP-1 and an increase for VEGF (5% serum), MIP-1α, MIP-1β, and MMP-2. Serum reduction lowered gene expression for VEGF (normoxia), MCP-1 (hypoxia), MIP-1α (hypoxia), MIP-1β (hypoxia), and MMP-2 (hypoxia) and increased gene expression for MMP-2 (normoxia). The level of secretion of these factors into the media generally paralleled gene expression with some exceptions. These data demonstrate that serum and oxygen levels have a significant effect on the gene expression and secretion of paracrine factors by MSC which will affect how MSC interact in vivo during myocardial ischemia.
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30
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Morciano G, Giorgi C, Bonora M, Punzetti S, Pavasini R, Wieckowski MR, Campo G, Pinton P. Molecular identity of the mitochondrial permeability transition pore and its role in ischemia-reperfusion injury. J Mol Cell Cardiol 2014; 78:142-53. [PMID: 25172387 DOI: 10.1016/j.yjmcc.2014.08.015] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/18/2014] [Accepted: 08/19/2014] [Indexed: 10/24/2022]
Abstract
The mitochondrial permeability transition is a key event in cell death. Intense research efforts have been focused on elucidating the molecular components of the mitochondrial permeability transition pore (mPTP) to improve the understanding and treatment of various pathologies, including neurodegenerative disorders, cancer and cardiac diseases. Several molecular factors have been proposed as core components of the mPTP; however, further investigation has indicated that these factors are among a wide range of regulators. Thus, the scientific community lacks a clear model of the mPTP. Here, we review the molecular factors involved in the regulation and formation of the mPTP. Furthermore, we propose that the mitochondrial ATP synthase, specifically its c subunit, is the central core component of the mPTP complex. Moreover, we discuss the involvement of the mPTP in ischemia and reperfusion as well as the results of clinical studies targeting the mPTP to ameliorate ischemia-reperfusion injury. This article is part of a Special Issue entitled "Mitochondria: From Basic Mitochondrial Biology to Cardiovascular Disease".
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Affiliation(s)
- Giampaolo Morciano
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Carlotta Giorgi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Massimo Bonora
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Silvia Punzetti
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria S. Anna and LTTA Center, Ferrara, Italy
| | - Rita Pavasini
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria S. Anna and LTTA Center, Ferrara, Italy
| | - Mariusz R Wieckowski
- Department of Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland
| | - Gianluca Campo
- Cardiovascular Institute, Azienda Ospedaliero-Universitaria S. Anna and LTTA Center, Ferrara, Italy
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy.
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Arroyo J, Price M, Straszewski-Chavez S, Torry RJ, Mor G, Torry DS. XIAP protein is induced by placenta growth factor (PLGF) and decreased during preeclampsia in trophoblast cells. Syst Biol Reprod Med 2014; 60:263-73. [DOI: 10.3109/19396368.2014.927540] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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32
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Effects of cerebrolysin on rat Schwann cells in vitro. Acta Histochem 2014; 116:820-30. [PMID: 24636538 DOI: 10.1016/j.acthis.2014.01.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 01/29/2014] [Accepted: 01/30/2014] [Indexed: 12/11/2022]
Abstract
Although the peripheral nervous system (PNS) is capable of regeneration, these processes are limited. As a potential means to augment PNS regeneration, the effects of cerebrolysin (CL), a proteolytic peptide fraction, were tested in vitro on Schwann cell (SC) proliferation, stress resistance, phagocytic and cluster-forming capacity. Primary SC/fibrocyte co-cultures were prepared from dorsal root ganglia of 5-7-day-old rats. SCs were subjected to mechanical stress by media change and metabolic stress by serum glucose deprivation (SGD). Cell survival was assessed using MTT test. SC proliferation was determined by counting BrdU-labeled cells. SC clustering was studied by ImageJ analysis of S100 immunostaining. Wallerian degeneration (WD) was evaluated by measuring acetylcholine-esterase staining within sciatic nerves in vitro. It was found that CL caused no effect on MTT turnover in the tested doses. CL inhibited SC proliferation in a dose-dependent manner. Media change and additional SGD stress inhibited SC clustering. CL enhanced the reorganization of SC clusters and was able to counteract SGD-induced cluster defects. Moreover, CL accelerated WD in vitro. CL was able to enhance the functions of SCs that are relevant to nerve regeneration. Thus, our findings suggest that CL may be suitable for therapeutic usage to enhance PNS regeneration/reconstruction.
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Murthy A, Li Y, Peng I, Reichelt M, Katakam AK, Noubade R, Roose-Girma M, DeVoss J, Diehl L, Graham RR, van Lookeren Campagne M. A Crohn's disease variant in Atg16l1 enhances its degradation by caspase 3. Nature 2014; 506:456-62. [PMID: 24553140 DOI: 10.1038/nature13044] [Citation(s) in RCA: 287] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 01/17/2014] [Indexed: 12/13/2022]
Abstract
Crohn's disease is a debilitating inflammatory bowel disease (IBD) that can involve the entire digestive tract. A single-nucleotide polymorphism (SNP) encoding a missense variant in the autophagy gene ATG16L1 (rs2241880, Thr300Ala) is strongly associated with the incidence of Crohn's disease. Numerous studies have demonstrated the effect of ATG16L1 deletion or deficiency; however, the molecular consequences of the Thr300Ala (T300A) variant remains unknown. Here we show that amino acids 296-299 constitute a caspase cleavage motif in ATG16L1 and that the T300A variant (T316A in mice) significantly increases ATG16L1 sensitization to caspase-3-mediated processing. We observed that death-receptor activation or starvation-induced metabolic stress in human and murine macrophages increased degradation of the T300A or T316A variants of ATG16L1, respectively, resulting in diminished autophagy. Knock-in mice harbouring the T316A variant showed defective clearance of the ileal pathogen Yersinia enterocolitica and an elevated inflammatory cytokine response. In turn, deletion of the caspase-3-encoding gene, Casp3, or elimination of the caspase cleavage site by site-directed mutagenesis rescued starvation-induced autophagy and pathogen clearance, respectively. These findings demonstrate that caspase 3 activation in the presence of a common risk allele leads to accelerated degradation of ATG16L1, placing cellular stress, apoptotic stimuli and impaired autophagy in a unified pathway that predisposes to Crohn's disease.
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Affiliation(s)
- Aditya Murthy
- Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Yun Li
- Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Ivan Peng
- Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Mike Reichelt
- Department of Pathology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Anand Kumar Katakam
- Department of Pathology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Rajkumar Noubade
- Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Merone Roose-Girma
- Department of Molecular Biology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Jason DeVoss
- Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Lauri Diehl
- Department of Pathology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
| | - Robert R Graham
- ITGR Human Genetics, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA
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Zhao S, Lin Q, Li H, He Y, Fang X, Chen F, Chen C, Huang Z. Carbon monoxide releasing molecule‑2 attenuated ischemia/reperfusion‑induced apoptosis in cardiomyocytes via a mitochondrial pathway. Mol Med Rep 2013; 9:754-62. [PMID: 24337106 DOI: 10.3892/mmr.2013.1861] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Accepted: 11/27/2013] [Indexed: 11/06/2022] Open
Abstract
Carbon monoxide (CO) is an endogenous gaseous transmitter that exerts multi-protection in ischemia/reperfusion (I/R) injury, but few experimental studies regarding CO on myocardial I/R-induced apoptosis, as well as its underlying mechanism have been conducted. The present study was designed to investigate whether CO released from CO-releasing molecule-2 (CORM-2) is capable of ameliorating myocardial I/R-induced apoptosis via a mitochondrial apoptotic pathway. Primary cultures of neonatal rat cardiomyocytes were randomly distributed into four groups: Control, I/R (cultured cardiomyocytes were subjected to 2 h simulated ischemia followed by 4 h reperfusion), CORM-2 and inactive CORM-2 (iCORM-2) groups (20 µM CORM-2 and 20 µM iCORM-2 were administered at the beginning of reperfusion following ischemia, respectively). Flow cytometric analysis showed that CORM-2 treatment significantly decreased apoptosis of cardiomyocytes triggered by simulated I/R. CORM-2 partially recovered mitochondrial respiration and ultrastructure alteration, and lowered caspase-3 expression and the release of cytochrome c. Furthermore, CORM-2 partly reduced BAK/BAX expression in mitochondria, as well as the BAX level in the cytoplasm. Cardioprotection is lost when CORM-2 is replaced by iCORM-2. CORM-2 treatment, at the time of reperfusion, was concluded to attenuate myocardial I/R-induced apoptosis. The protection mechanisms may be targeted to the mitochondria and involved in the inhibition of the BAK/BAX‑mediated intrinsic pathway.
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Affiliation(s)
- Shen Zhao
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Qingming Lin
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Heng Li
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Yumin He
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Xiangshao Fang
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Feng Chen
- Provincial Clinical Medical College of Fujian Medical University, Fuzhou, Fujian 350001, P.R. China
| | - Changwei Chen
- Taiping People's Hospital of Dongguan City, Dongguan, Guangdong 523900, P.R. China
| | - Zitong Huang
- Department of Emergency, Sun Yat‑sen Memorial Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510120, P.R. China
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Lane DJR, Huang MLH, Ting S, Sivagurunathan S, Richardson DR. Biochemistry of cardiomyopathy in the mitochondrial disease Friedreich's ataxia. Biochem J 2013; 453:321-36. [PMID: 23849057 DOI: 10.1042/bj20130079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
FRDA (Friedreich's ataxia) is a debilitating mitochondrial disorder leading to neural and cardiac degeneration, which is caused by a mutation in the frataxin gene that leads to decreased frataxin expression. The most common cause of death in FRDA patients is heart failure, although it is not known how the deficiency in frataxin potentiates the observed cardiomyopathy. The major proposed biochemical mechanisms for disease pathogenesis and the origins of heart failure in FRDA involve metabolic perturbations caused by decreased frataxin expression. Additionally, recent data suggest that low frataxin expression in heart muscle of conditional frataxin knockout mice activates an integrated stress response that contributes to and/or exacerbates cardiac hypertrophy and the loss of cardiomyocytes. The elucidation of these potential mechanisms will lead to a more comprehensive understanding of the pathogenesis of FRDA, and will contribute to the development of better treatments and therapeutics.
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Affiliation(s)
- Darius J R Lane
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, Blackburn Building, D06, University of Sydney, Sydney, NSW 2006, Australia
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Chen F, Cao YG, Qi HP, Li L, Huang W, Wang Y, Sun HL. Involvement of cardiomyocyte apoptosis in myocardial injury of hereditary epileptic rats. Can J Physiol Pharmacol 2013; 91:804-11. [PMID: 24144051 DOI: 10.1139/cjpp-2013-0005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Many clinical cases have been reported where epilepsy profoundly influenced the pathophysiological function of the heart; however, the underlying mechanisms were not elucidated. We use the tremor (TRM) rat as an animal model of epilepsy to investigate the potential mechanisms of myocardial injury. Cardiac functions were assessed by arrhythmia score, heart rate, heart:body mass ratio, and hemodynamic parameters including left ventricular systolic pressure (LVSP), left ventricular end-diastolic pressure (LVEDP), and maximum rate of left ventricular pressure rise and fall (+dp/dtmax and -dp/dtmax). Catecholamine level was detected by HPLC. Apoptotic index was estimated by TUNEL assay. The expressions of Bcl-2, Bax, caspase-3, extracellular signal-regulated protein kinase (ERK), c-Jun NH2-terminal protein kinases (JNK), and p38 were evaluated by Western blot. The results indicated that there existed cardiac dysfunction and cardiomyocyte apoptosis, accompanied by increasing catecholamine levels in TRM rats. Further investigation revealed that apoptosis was mediated by reducing Bcl-2, upregulating Bax, and activating caspase-3. Additional experiments demonstrated that P-ERK1/2 was decreased, whereas P-JNK and P-p38 were up-regulated. Our results suggest that the sympathetic nervous system activation and cardiomyocyte apoptosis are involved in the myocardial injury of TRM rats. The mechanisms of apoptosis might be associated with the activation of the mitochondria-initiated and the mitogen-activated protein kinase pathways.
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Affiliation(s)
- Fan Chen
- a Department of Pharmacology, Harbin Medical University - Daqing, Daqing, Heilongjiang 163319, China
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Majumdar D, Bhonde R, Datta I. Influence of ischemic microenvironment on human Wharton's Jelly mesenchymal stromal cells. Placenta 2013; 34:642-9. [PMID: 23702186 DOI: 10.1016/j.placenta.2013.04.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 04/13/2013] [Accepted: 04/30/2013] [Indexed: 01/01/2023]
Abstract
INTRODUCTION While in vivo studies suggest poor survival of mesenchymal stromal cells (MSCs) after transplantation in ischemic conditions, in vitro studies report diverse effects on proliferation, apoptosis and differentiation of stem/precursor cells of different tissue-origin. The present focus is to understand the influence of ischemic microenvironment on the survival, proliferation, apoptosis, ROS-generation, antioxidant levels, immunophenotypic-expression and neurotrophic factor secretion of Wharton's Jelly (WJ)-MSCs. METHOD WJ-MSCs were cultured in normoxic and hypoxic conditions in presence and absence of serum and the end-point parameters were measured at 4 time-points. Cell survival, proliferation, apoptosis, ROS-generation and immunophenotypic-expression were quantitatively detected either by fluorimetry or flow cytometry techniques. ELISA-based methods were used for detection of antioxidant-substrate glutathione (GSH) and neurotrophic factors [vascular endothelial factor (VEGF), hepatocyte growth factor (HGF) and brain-derived neurotrophic factor (BDNF)]. Expression of the antioxidants glutathione peroxidase (GPx) and superoxide dismutase 1 (SOD1), was measured by real-time RT-PCR. RESULT Immunophenotypic analysis showed reduction in mesenchymal-marker (CD73, CD90, and CD105) expression under ischemic conditions influenced mainly by hypoxia, whereas the decrease in cell-survival under ischemic condition was mainly as a result of nutrition depletion. This was associated with increased ROS-generation and apoptosis and reduction in antioxidants (GSH, GPx, SOD1). For neurotrophic factors, ELISA-readings showed that VEGF and HGF secretion (which were higher in hypoxia) peaked at 48 h and decreased from 72 h, though BDNF release did not decrease. DISCUSSION Therapeutic benefits rendered by WJ-MSCs in in vitro ischemic microenvironment are highest at the 48 h time-point, declining thereafter with time probably due to failure in cellular defense systems and the onset of apoptosis. CONCLUSION It is hence clear that the growth factor deficiency is more lethal to the cells than hypoxia in ischemic microenvironment.
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Affiliation(s)
- D Majumdar
- Manipal Institute of Regenerative Medicine, Manipal University, Bangalore, Karnataka, India
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Abstract
It is believed that cardiac remodeling due to geometric and structural changes is a major mechanism for the progression of heart failure in different pathologies including hypertension, hypertrophic cardiomyopathy, dilated cardiomyopathy, diabetic cardiomyopathy, and myocardial infarction. Increases in the activities of proteolytic enzymes such as matrix metalloproteinases, calpains, cathepsins, and caspases contribute to the process of cardiac remodeling. In addition to modifying the extracellular matrix, both matrix metalloproteinases and cathepsins have been shown to affect the activities of subcellular organelles in cardiomyocytes. The activation of calpains and caspases has been identified to induce subcellular remodeling in failing hearts. Proteolytic activities associated with different proteins including caspases, calpain, and the ubiquitin-proteasome system have been shown to be involved in cardiomyocyte apoptosis, which is an integral part of cardiac remodeling. This article discusses and compares how the activities of various proteases are involved in different cardiac abnormalities with respect to alterations in apoptotic pathways, cardiac remodeling, and cardiac dysfunction. An imbalance appears to occur between the activities of some proteases and their endogenous inhibitors in various types of hypertrophied and failing hearts, and this is likely to further accentuate subcellular remodeling and cardiac dysfunction. The importance of inhibiting the activities of both extracellular and intracellular proteases specific to distinct etiologies, in attenuating cardiac remodeling and apoptosis as well as biochemical changes of subcellular organelles, in heart failure has been emphasized. It is suggested that combination therapy to inhibit different proteases may prove useful for the treatment of heart failure.
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Affiliation(s)
- Alison L Müller
- Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre, Winnipeg, MB, Canada
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Huang YC, Leung VYL, Lu WW, Luk KDK. The effects of microenvironment in mesenchymal stem cell-based regeneration of intervertebral disc. Spine J 2013; 13:352-62. [PMID: 23340343 DOI: 10.1016/j.spinee.2012.12.005] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Revised: 07/08/2012] [Accepted: 12/09/2012] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Recent studies have demonstrated new therapeutic strategy using transplantation of mesenchymal stem cells (MSCs), especially bone marrow-derived MSCs (BM-MSCs), to preserve intervertebral disc (IVD) structure and functions. It is important to understand whether and how the MSCs survive and thrive in the hostile microenvironment of the degenerated IVD. Therefore, this review majorly examines how resident disc cells, hypoxia, low nutrition, acidic pH, mechanical loading, endogenous proteinases, and cytokines regulate the behavior of the exogenous MSCs. PURPOSE To review and summarize the effect of the microenvironment in biological characteristics of BM-MSCs for IVD regeneration; the presence of endogenous stem cells and the state of the art in the use of BM-MSCs to regenerate the IVD in vivo were also discussed. STUDY DESIGN Literature review. METHODS MEDLINE electronic database was used to search for articles concerning stem/progenitor cell isolation from the IVD, regulation of the components of microenvironment for MSCs, and MSC-based therapy for IVD degeneration. The search was limited to English language. RESULTS Stem cells are probably resident in the disc, but exogenous stem cells, especially BM-MSCs, are currently the most popular graft cells for IVD regeneration. The endogenous disc cells and the biochemical and biophysical components in the degenerating disc present a complicated microenvironment to regulate the transplanted BM-MSCs. Although MSCs regenerate the mildly degenerative disc effectively in the experimental and clinical trials, many underlying questions are in need of further investigation. CONCLUSIONS There has been a dramatic improvement in the understanding of potential MSC-based therapy for IVD regeneration. The use of MSCs for IVD degeneration is still at the stage of preclinical and Phase 1 studies. The effects of the disc microenvironment in MSCs survival and function should be closely studied for transferring MSC transplantation from bench to bedside successfully.
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Affiliation(s)
- Yong-Can Huang
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, Queen Mary Hospital, The University of Hong Kong, 5/F Professor Block, Pokfulam, Hong Kong, China
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Han SW, Jung YK, Lee EJ, Park HR, Kim GW, Jeong JH, Han MS, Choi JY. DICAM inhibits angiogenesis via suppression of AKT and p38 MAP kinase signalling. Cardiovasc Res 2013; 98:73-82. [DOI: 10.1093/cvr/cvt019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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Liu SY, Chen CL, Yang TT, Huang WC, Hsieh CY, Shen WJ, Tsai TT, Shieh CC, Lin CF. Albumin prevents reactive oxygen species-induced mitochondrial damage, autophagy, and apoptosis during serum starvation. Apoptosis 2012; 17:1156-69. [DOI: 10.1007/s10495-012-0758-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Anthocyanins block ischemia-induced apoptosis in the perfused heart and support mitochondrial respiration potentially by reducing cytosolic cytochrome c. Int J Biochem Cell Biol 2012; 45:23-9. [PMID: 22842532 DOI: 10.1016/j.biocel.2012.07.022] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 07/07/2012] [Accepted: 07/18/2012] [Indexed: 12/27/2022]
Abstract
Anthocynanins, found in fruits and vegetables, have a variety of protective properties, which have generally been attributed to their antioxidant capacity. However, antioxidants are generally strong reductants, and some reductants have been found to block apoptosis by reducing cytosolic cytochrome c, which prevents caspase activation. We tested the ability of various anthocyanins: to reduce cytochrome c, to support cytochrome c-induced mitochondrial respiration and to inhibit apoptosis induced by heart ischemia. Anthocyanins such as delphinidin-3-glucoside (Dp3G) and cyanidin-3-glucoside (Cy3G) were able to reduce cytochrome c directly and rapidly, whereas pelargonidin-3-glucoside (Pg3G), malvinidin-3-glucoside (Mv3G) and peonidin-3-glucoside (Pn3G) had relatively low cytochrome c reducing activities. Dp3G and Cy3G but not Pg3G supported mitochondrial state 4 respiration in the presence of exogenous cytochrome c. Pre-perfusion of hearts with 20 μM Cy3G but not Pg3G prevented ischemia-induced caspase activation. This suggests that the ability of anthocyanins to block caspase activation may be due to their ability to reduce cytosolic cytochrome c. This article is part of a Directed Issue entitled: Bioenergetic dysfunction, adaptation and therapy.
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Protecting mitochondrial bioenergetic function during resuscitation from cardiac arrest. Crit Care Clin 2012; 28:245-70. [PMID: 22433486 DOI: 10.1016/j.ccc.2012.02.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Li J, Xu X, Zhang S, Zheng M, Wu Z, Weng Y, Ouyang L, Yu J, Li F. Adenovirus-mediated transfection with glucose transporter 3 suppresses PC12 cell apoptosis following ischemic injury. Neural Regen Res 2012; 7:1338-42. [PMID: 25657665 PMCID: PMC4308805 DOI: 10.3969/j.issn.1673-5374.2012.17.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Accepted: 03/06/2012] [Indexed: 11/23/2022] Open
Abstract
In this study, we investigated the effects of adenovirus-mediated transfection of PC12 cells with glucose transporter 3 after ischemic injury. The results of flow cytometry and TUNEL showed that exogenous glucose transporter 3 significantly suppressed PC12 cell apoptosis induced by ischemic injury. The results of isotopic scintiscan and western blot assays showed that, the glucose uptake rate was significantly increased and nuclear factor kappaB expression was significantly decreased after adenovirus-mediated transfection of ischemic PC12 cells with glucose transporter 3. These results suggest that adenovirus-mediated transfection of cells with glucose transporter 3 elevates the energy metabolism of PC12 cells with ischemic injury, and inhibits cell apoptosis.
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Affiliation(s)
- Junliang Li
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Xinke Xu
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Shanyi Zhang
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Meiguang Zheng
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Zhonghua Wu
- Department of Neurosurgery, Henan Provincial People's Hospital, Zhengzhou 450003, Henan Province, China
| | - Yinlun Weng
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Leping Ouyang
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Jian Yu
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
| | - Fangcheng Li
- Department of Neurosurgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, Guangdong Province, China
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Siggens L, Figg N, Bennett M, Foo R. Nutrient deprivation regulates DNA damage repair in cardiomyocytes via loss of the base-excision repair enzyme OGG1. FASEB J 2012; 26:2117-24. [PMID: 22302830 PMCID: PMC3630495 DOI: 10.1096/fj.11-197525] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Oxidative stress contributes to the pathogenesis of many diseases, including heart failure, but the role and regulation of oxidative DNA damage in many cases have not been studied. Here, we set out to examine how oxidative DNA damage is regulated in cardiomyocytes. Compared to normal healthy controls, human hearts in end-stage cardiomyopathy (EsCM) showed a high degree of DNA damage by histological evidence of damage markers, including 8-oxoG and γH2AX (8-oxoG: 4.7±0.88 vs. 99.9±0.11%; γH2AX: 2.1±0.33 vs. 85.0±13.8%; P<0.01) This raised the possibility that defective DNA repair may be partly responsible. Indeed, nutrient deprivation led to impaired base-excision repair (BER) in cardiomyocytes in vitro, accompanied by loss of the BER enzyme OGG1, while BER activity was rescued by recombinant OGG1 (control vs. nutrient deprived vs. nutrient deprived+OGG1; 100±2.96 vs. 68.2±7.53 vs. 94.0±0.72%; ANOVA, P<0.01). Hearts from humans with EsCM and two murine models of myocardial stress also showed a loss of OGG1 protein. OGG1 loss was inhibited by the autophagy inhibitor bafilomycin and in autophagy-deficient Atg5(-/-) mouse embryonic fibroblasts. However, pharmacological activation of autophagy, itself, did not induce OGG1 loss, suggesting that autophagy is necessary but not sufficient for OGG1 turnover, and OGG1 loss requires concurrent nutrient deprivation. Finally, we found that the role of autophagy in nutrient starvation is complex, since it balanced the positive effects of ROS inhibition against the negative effect of OGG1 loss. Therefore, we have identified a central role for OGG1 in regulating DNA repair in cardiomyopathy. The manipulation of OGG1 may be used in future studies to examine the direct contribution of oxidative DNA damage to the progression of heart failure.
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Affiliation(s)
- Lee Siggens
- Division of Cardiovascular Medicine, University of Cambridge, Addenbrooke’s Hospital, Cambridge, UK
| | - Nichola Figg
- Division of Cardiovascular Medicine, University of Cambridge, Addenbrooke’s Hospital, Cambridge, UK
| | - Martin Bennett
- Division of Cardiovascular Medicine, University of Cambridge, Addenbrooke’s Hospital, Cambridge, UK
| | - Roger Foo
- Division of Cardiovascular Medicine, University of Cambridge, Addenbrooke’s Hospital, Cambridge, UK
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Li X, Liu L, Meng D, Wang D, Zhang J, Shi D, Liu H, Xu H, Lu L, Sun L. Enhanced apoptosis and senescence of bone-marrow-derived mesenchymal stem cells in patients with systemic lupus erythematosus. Stem Cells Dev 2012; 21:2387-94. [PMID: 22375903 DOI: 10.1089/scd.2011.0447] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Previous studies indicated that bone marrow mesenchymal stem cells (BMSCs) from patients with systemic lupus erythematosus (SLE) exhibited impaired capacities of proliferation, differentiation, secretion of cytokines, and immune modulation. In this study, we aimed to investigate whether apoptosis and senescence of SLE BMSCs were dysregulated. We found that there were increased frequencies of apoptotic and aging SLE BMSCs in comparison with those of normal controls. Notably, levels of Bcl-2 expression in SLE BMSCs were markedly decreased both at mRNA and protein levels. When BMSCs were induced to apoptosis by tumor necrosis factor-α (TNF-α) stimulation in vitro, the Bax and caspase 8 expression in SLE BMSCs was significantly increased at mRNA levels. The activity of caspase 8 was also enhanced in SLE BMSCs. More cytochrome-C-positive pellets in the cytosolic fraction of BMSCs were detected in SLE patients than in normal controls. The expression of Fas and tumor necrosis factor-α receptor 1 in SLE BMSCs was significantly upregulated compared with normal controls, and the serum levels of FasL and TNF-α were also elevated. Moreover, intracellular reactive oxygen species levels of SLE BMSCs were higher than those of normal controls, with the activation of PI3K/AKT/FoxO3 signaling pathway. Taken together, our results demonstrate increased apoptosis and senescence in SLE BMSCs, which may be associated with the pathogenesis of SLE.
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Affiliation(s)
- Xia Li
- Department of Immunology and Rheumatology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
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Wang G, Jin C, Hou Y, Zhang L, Li S, Zhang L, Wu B, Li Q, Xu C, Tian Y, Zhang L. Overexpression of Shp-2 attenuates apoptosis in neonatal rat cardiac myocytes through the ERK pathway. Exp Mol Pathol 2012; 93:50-5. [PMID: 22537548 DOI: 10.1016/j.yexmp.2012.04.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/26/2012] [Accepted: 04/09/2012] [Indexed: 10/28/2022]
Abstract
During cardiac ischemia and end-stage heart disease, a large number of cardiac cells are apoptotic, and therefore, heart function is impaired. Although the role of Shp-2 in cell survival has been reported, its regulation of cardiac apoptosis is still undetermined. To better understand the potential role of Shp-2 in apoptosis, cell death was determined in serum-depleted cardiomyocytes. Shp-2 was inhibited by NSC87877, and apoptosis, Cyt C release and caspase 3 activation were determined. To evaluate the notion that Shp-2 plays a role in survival stimulation, wild-type and gain-of-function mutant Shp-2 adenoviruses were infected into neonatal cardiomyocytes, and ERK activation was examined. Finally, the MEK inhibitor U0126 was utilized to block the ERK pathway and determine the role of Shp-2 in this pathway. We found that Shp-2 inhibition enhanced apoptosis via regulation of mitochondrial Cyt C release and activation of caspase 3. Overexpression of Shp-2 inhibited apoptosis through activation of ERK. The MEK inhibitor U0126 abolished Shp-2's effect on apoptosis in cardiomyocytes. Our results have revealed that Shp-2 functions as an intracellular inhibitor of apoptosis. These data provide insight into the pathogenesis and the therapeutic strategies of heart diseases.
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Affiliation(s)
- Guoyuan Wang
- Department of Pathophysiology, Harbin Medical University, Harbin 150086, China
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Itagaki K, Naito T, Iwakiri R, Haga M, Miura S, Saito Y, Owaki T, Kamiya S, Iyoda T, Yajima H, Iwashita S, Ejiri SI, Fukai F. Eukaryotic translation elongation factor 1A induces anoikis by triggering cell detachment. J Biol Chem 2012; 287:16037-46. [PMID: 22399298 DOI: 10.1074/jbc.m111.308122] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Anoikis, apoptosis because of loss of cell anchorage, is crucial for tissue homeostasis. Fibronectin not only provides a scaffold for cell anchorage but also harbors a cryptic antiadhesive site capable of inducing β1-integrin inactivation. In this study, this cryptic antiadhesive site is implicated in spontaneous induction of anoikis. Nontransformed fibroblasts (NIH3T3) adhering to a fibronectin substratum underwent anoikis during serum starvation culture. This anoikis was caused by proteolytic exposure of the cryptic antiadhesive site in fibronectin by matrix metalloproteinase. Eukaryotic elongation factor 1A (eEF1A) was identified as a membrane receptor for the exposed antiadhesive site. Serum starvation raised the membrane residence of eEF1A, and siRNA-based disruption of this increase rendered cells anoikis-resistant. By contrast, cells became more susceptible to anoikis in parallel with increased membrane residence of eEF1A by enforced expression. These results demonstrate that eEF1A acts as a membrane receptor for the cryptic antiadhesive site of fibronectin, which contributes to cell regulation, including anoikis, through negative regulation of cell anchorage.
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Affiliation(s)
- Keisuke Itagaki
- Department of Molecular Pathophysiology, Tokyo University of Science, Chiba 278-8510, Japan
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Song J, Guo X, Xie X, Zhao X, Li D, Deng W, Song Y, Shen F, Wu M, Wei L. Autophagy in hypoxia protects cancer cells against apoptosis induced by nutrient deprivation through a Beclin1-dependent way in hepatocellular carcinoma. J Cell Biochem 2012; 112:3406-20. [PMID: 21769915 DOI: 10.1002/jcb.23274] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Oxygen deficiency and nutrient deprivation widely exists in solid tumors because of the poor blood supply. However, cancer cells can survive this adverse condition and proliferate continuously to develop. To figure out the way to survive, we investigated the role of autophagy in the microenvironment in hepatocellular carcinoma. In order to simulate the tumor microenvironment more veritably, cells were cultured in oxygen-nutrient-deprived condition following a hypoxia preconditioning. As a result, cell death under hypoxia plus nutrient deprivation was much less than that under nutrient deprivation only. And the decreased cell death mainly attributed to the decreased apoptosis. GFP-LC3 and electron microscopy analysis showed that autophagy was significantly activated in the period of hypoxia preconditioning. However, autophagic inhibitor-3-MA significantly abrogated the apoptosis reduction in hypoxia, which implied the involvement of autophagy in protection of hepatocellular carcinoma cells against apoptosis induced by starvation. Furthermore, Beclin 1 was proved to play an important role in this process. siRNA targeting Beclin 1 was transfected into hepatocellular carcinoma cells. And both data from western blot detecting the expression of LC3-II and transmission microscopy observing the accumulation of autophagosomes showed that autophagy was inhibited obviously as a result of Beclin 1 knockdown. Besides, the decreased apoptosis of starved cells under hypoxia was reversed. Taken together, these results suggest that autophagy activated by hypoxia mediates the tolerance of hepatocellular carcinoma cells to nutrient deprivation, and this tolerance is dependent on the activity of Beclin 1.
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Affiliation(s)
- Jianrui Song
- Tumor Immunology and Gene Therapy Center, Eastern Hepatobiliary Surgery Hospital, The Second Military Medical University, Shanghai, China
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Bae YS, Oh H, Rhee SG, Yoo YD. Regulation of reactive oxygen species generation in cell signaling. Mol Cells 2011; 32:491-509. [PMID: 22207195 PMCID: PMC3887685 DOI: 10.1007/s10059-011-0276-3] [Citation(s) in RCA: 450] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 12/12/2011] [Indexed: 12/19/2022] Open
Abstract
Reactive oxygen species (ROS) including superoxide anion and hydrogen peroxide (H(2)O(2)) are thought to be byproducts of aerobic respiration with damaging effects on DNA, protein, and lipid. A growing body of evidence indicates, however, that ROS are involved in the maintenance of redox homeostasis and various cellular signaling pathways. ROS are generated from diverse sources including mitochondrial respiratory chain, enzymatic activation of cytochrome p450, and NADPH oxidases further suggesting involvement in a complex array of cellular processes. This review summarizes the production and function of ROS. In particular, how cytosolic and membrane proteins regulate ROS generation for intracellular redox signaling will be detailed.
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Affiliation(s)
- Yun Soo Bae
- Department of Life Science, Division of Life and Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Korea
| | - Hyunjin Oh
- Department of Life Science, Division of Life and Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Korea
| | - Sue Goo Rhee
- Department of Life Science, Division of Life and Pharmaceutical Sciences, Ewha Womans University, Seoul 120-750, Korea
| | - Young Do Yoo
- Laboratory of Molecular Cell Biology, Graduate School of Medicine, Korea University College of Medicine, Korea University, Seoul 136-705, Korea
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