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Reddy VS, Pandarinath S, Archana M, Reddy GB. Impact of chronic hyperglycemia on Small Heat Shock Proteins in diabetic rat brain. Arch Biochem Biophys 2021; 701:108816. [PMID: 33631184 DOI: 10.1016/j.abb.2021.108816] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 02/12/2021] [Accepted: 02/14/2021] [Indexed: 12/21/2022]
Abstract
Small heat shock proteins (sHsps) are a family of proteins. Some are induced in response to multiple stimuli and others are constitutively expressed. They are involved in fundamental cellular processes, including protein folding, apoptosis, and maintenance of cytoskeletal integrity. Hyperglycemia created during diabetes leads to neuronal derangements in the brain. In this study, we investigated the impact of chronic hyperglycemia on the expression of sHsps and heat shock transcription factors (HSFs), solubility and aggregation of sHsps and amyloidogenic proteins, and their role in neuronal apoptosis in a diabetic rat model. Diabetes was induced in Sprague-Dawley rats with streptozotocin and hyperglycemia was maintained for 16 weeks. Expressions of sHsps and HSFs were analyzed by qRT-PCR and immunoblotting in the cerebral cortex. Solubility of sHsps and amyloidogenic proteins, including α-synuclein and Tau, was analyzed by the detergent soluble assay. Neuronal cell death was analyzed by TUNEL staining and apoptotic markers. The interaction of sHsps with amyloidogenic proteins and Bax was assessed using co-immunoprecipitation. Hyperglycemia decreased Hsp27 and HSF1, and increased αBC, Hsp22, and HSF4 levels at transcript and protein levels. Diabetes induced the aggregation of αBC, Hsp22, α-synuclein, and pTau, as their levels were higher in the insoluble fraction. Additionally, diabetes impaired the interaction of αBC with α-synuclein and pTau. Furthermore, diabetes reduced the interaction of αBC with Bax, which may possibly contribute to neuronal apoptosis. Together, these results indicate that chronic hyperglycemia induces differential responses of sHsps by altering their expression, solubility, interaction, and roles in apoptosis.
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Affiliation(s)
- V Sudhakar Reddy
- Biochemistry Division, ICMR-National Institute of Nutrition, Hyderabad, India.
| | - S Pandarinath
- Biochemistry Division, ICMR-National Institute of Nutrition, Hyderabad, India
| | - M Archana
- Biochemistry Division, ICMR-National Institute of Nutrition, Hyderabad, India
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OIP5-AS1 Attenuates Microangiopathy in Diabetic Mouse by Regulating miR-200b/ACE2. World Neurosurg 2020; 139:e52-e60. [PMID: 32200014 DOI: 10.1016/j.wneu.2020.03.063] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 02/05/2023]
Abstract
OBJECTIVE This study aimed to investigate OIP5-AS1 effects on microangiopathy in diabetic mouse. METHODS The expression levels of OIP5-AS1, miR-200b, and ACE2 expression were measured by RT-qPCR. Western blot was conducted to detect The ACE2 and Ang-(1-7) expression. Luciferase reporter assays were used to identify the interaction between miR-200b and OIP5-AS1 or ACE2. Morris water maze test was performed for detecting cognitive function. RESULTS Our results indicated that diabetic mice exhibited much lower OIP5-AS1 expression in the hippocampus than normal mice. Diabetic mice of OIP5-AS1 KO group showed remarkably lower OIP5-AS1 expression in the hippocampus, longer escape latency and lower percentage of CD31+ cells in the hippocampusthan those of WT group. OIP5-AS1 knockdown directly up-regulated miR-200b expression and ACE2 was directly inhibited by miR-200b. Relative to normal mice, diabetic mice had markedly higher miR-200b expression and lower ACE2 expression in the hippocampus. Diabetic mice of OIP5-AS1 KO group were with obviously higher miR-200b expression and lower ACE2 expression in the hippocampus than those of WT group. Compared with diabetic mice of OIP5-AS1 KO group, those of WT group, OIP5-AS1 KO + miR-200b inhibitor group and OIP5-AS1 KO + ACE2 group had obviously shorter escape latency and higher percentage of CD31+ cells and more caspase-3 protein expression in the hippocampus. CONCLUSIONS OIP5-AS1 attenuated microangiopathy in diabetic mouse by regulating miR-200b/ACE2.
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Terra LF, Wailemann RAM, Dos Santos AF, Gomes VM, Silva RP, Laporte A, Meotti FC, Terra WR, Palmisano G, Lortz S, Labriola L. Heat shock protein B1 is a key mediator of prolactin-induced beta-cell cytoprotection against oxidative stress. Free Radic Biol Med 2019; 134:394-405. [PMID: 30699366 DOI: 10.1016/j.freeradbiomed.2019.01.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 01/15/2019] [Accepted: 01/20/2019] [Indexed: 12/11/2022]
Abstract
Maintaining islet cell viability in vitro, although challenging, appears to be a strategy for improving the outcome of pancreatic islet transplantation. We have shown that prolactin (PRL) leads to beta-cell cytoprotection against apoptosis, an effect mediated by heat shock protein B1 (HSPB1). Since the role of HSPB1 in beta-cells is still unclear and the hormone concentration used is not compatible with clinical applications because of all the side effects displayed by the hormone in other tissues, we explored the molecular mechanisms by which HSPB1 mediates beta-cell cytoprotection. Lysates from PRL- and/or cytokine-treated MIN6 beta-cells were subjected to HSPB1 immunoprecipitation followed by identification through mass spectrometry. PRL-treated cells presented an enrichment of several proteins co-precipitating with HSPB1. Of note were oxidative stress resistance-, protein degradation- and carbohydrate metabolism-related proteins. Wild type, HSPB1 silenced or overexpressing MIN6 cells were exposed to menadione and hydrogen peroxide and analysed for several oxidative stress parameters. HSPB1 knockdown rendered cells more sensitive to oxidative stress and led to a reduced antioxidant capacity, while prolactin induced an HSPB1-mediated cytoprotection against oxidative stress. HSPB1 overexpression, however, led to opposite effects. PRL treatment, HSPB1 silencing or overexpression did not change the expression nor activities of antioxidant enzymes, it also did not lead to a modulation of total glutathione levels nor G6PD expression. However, HSPB1 levels are related to a modulation of GSH/GSSG ratio, G6PD activity and NADPH/NADP + ratio. We have shown that HSPB1 is important for pro-survival effects against oxidative stress-induced beta-cell death. These results are in accordance with PRL-induced enrichment of HSPB1-interacting proteins related to protection against oxidative stress. Finally, our results outline the need of further studies investigating the importance of HSPB1 for beta-cell viability, since this could lead to the mitigation of beta-cell death through the up-regulation of an endogenous protective pathway.
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Affiliation(s)
- Letícia F Terra
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil; Institute of Clinical Biochemistry, Hannover Medical School (MHH), Carl-Neuberg-Straße, 1, 30625, Hannover, Germany.
| | - Rosangela A M Wailemann
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Ancély F Dos Santos
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Vinicius M Gomes
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Railmara P Silva
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Anna Laporte
- Institute of Clinical Biochemistry, Hannover Medical School (MHH), Carl-Neuberg-Straße, 1, 30625, Hannover, Germany.
| | - Flávia C Meotti
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Walter R Terra
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
| | - Giuseppe Palmisano
- Departamento de Parasitologia, Instituto de Ciencias Biomedicas (Edifício II), Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 1374, 05508-000 Sao Paulo, Brazil.
| | - Stephan Lortz
- Institute of Clinical Biochemistry, Hannover Medical School (MHH), Carl-Neuberg-Straße, 1, 30625, Hannover, Germany.
| | - Leticia Labriola
- Departamento de Bioquimica, Instituto de Quimica, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, 05508-000 Sao Paulo, Brazil.
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Huang Y, Liao Z, Lin X, Wu X, Chen X, Bai X, Zhuang Y, Yang Y, Zhang J. Overexpression of miR-146a Might Regulate Polarization Transitions of BV-2 Cells Induced by High Glucose and Glucose Fluctuations. Front Endocrinol (Lausanne) 2019; 10:719. [PMID: 31695681 PMCID: PMC6817609 DOI: 10.3389/fendo.2019.00719] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 10/04/2019] [Indexed: 12/15/2022] Open
Abstract
Microglia are critical in neuroinflammation. M1/M2 polarization transitions of microglial phenotypes determine the states of neuroinflammation and are regulated by multiple pathways, including miRNAs and other epigenetic regulations. This study investigated the polarization transitions of microglia induced by high glucose and glucose fluctuations, and the role of miR-146a in regulating M1/M2 polarization transitions of microglia. BV-2 cells were cultured with 25 mmol/L glucose, 75 mmol/L glucose, and 25 mmol/L-75 mmol/L glucose fluctuation for 48 h. BV-2 cells overexpressing miR-146a were generated using a lentiviral vector. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to measure mRNA expression of miR-146a, CD11b, iNOS, Arg-1, IRAK1, TRAF6, and NF-κB. Immunofluorescence was used to measure CD11b expression. Western blot was used to measure protein expression of CD11b, iNOS, and Arg-1. Compared with those in the 25 mmol/L glucose control group, expression of CD11b, iNOS, TNF-α, and IL-6 in the 75 mmol/L glucose or glucose fluctuation groups of cultured BV-2 cells were significantly increased, while Arg-1 and IL-10 was significantly decreased. These effects were reversed by overexpression of miR-146a. Furthermore, expression of IRAK1, TRAF6, and NF-κB was significantly increased in the high glucose and glucose fluctuation groups; this was reduced after miR-146a overexpression. In sum, high glucose and glucose fluctuations induced polarization transitions from M1 to M2 phenotype in BV-2 cells. Overexpression of miR-146a might protect BV-2 cells from high glucose and glucose fluctuation associated with M1/M2 polarization transitions by downregulating the expression of IRAK1, TRAF6, and NF-κB.
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Affiliation(s)
- Yinqiong Huang
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Zhenling Liao
- Department of Endocrinology, The First People's Hospital of Shaoguan City, Shaoguan, China
| | - Xiahong Lin
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
- *Correspondence: Xiahong Lin
| | - Xiaohong Wu
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Xiaoyu Chen
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Xuefeng Bai
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Yong Zhuang
- Department of Endocrinology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Yingxia Yang
- Department of Neurology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
| | - Jinying Zhang
- Department of Neurology, The Second Affiliated Hospital of Fujian Medical University, Quanzhou, China
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Wailemann RA, Terra LF, Oliveira TC, Dos Santos AF, Gomes VM, Labriola L. Heat shock protein B1 is required for the prolactin-induced cytoprotective effects on pancreatic islets. Mol Cell Endocrinol 2018; 477:39-47. [PMID: 29792912 DOI: 10.1016/j.mce.2018.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/18/2018] [Accepted: 05/18/2018] [Indexed: 12/14/2022]
Abstract
The success of islet transplantation has improved lately. Unfortunately, it is still compromised by cell loss. We have shown that prolactin (PRL) inhibits beta-cell apoptosis and up-regulates the antiapoptotic Heat Shock Protein B1 (HSPB1) in human islets. Since its function in pancreatic islets has not been studied, we explored the role of HSPB1 in PRL-induced beta-cell survival. The significant PRL-induced cytoprotection in control cells was abrogated in HSPB1 silenced cells, overexpression of HSPB1 recovered survival. PRL-mediated inhibition of cytokine-induced caspase activities and cytokine-induced decrease of BCL-2/BAX ratio was significantly reverted in knocked-down cells. Kinetics of HSPB1 and HSF1 expression were studied in primary cultures of murine and human pancreatic islets. These findings are highly relevant for the improvement of clinical islet transplantation success rate since our results demonstrated a key role for HSPB1 pointing it as a promising target for beta-cell cytoprotection through the up-regulation of an endogenous protective pathway.
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Affiliation(s)
| | - Letícia F Terra
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil
| | - Talita C Oliveira
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil
| | - Ancély F Dos Santos
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil
| | - Vinícius M Gomes
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil
| | - Leticia Labriola
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Brazil.
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Heat Shock Proteins in Vascular Diabetic Complications: Review and Future Perspective. Int J Mol Sci 2017; 18:ijms18122709. [PMID: 29240668 PMCID: PMC5751310 DOI: 10.3390/ijms18122709] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 12/09/2017] [Accepted: 12/11/2017] [Indexed: 01/22/2023] Open
Abstract
Heat shock proteins (HSPs) are a large family of proteins highly conserved throughout evolution because of their unique cytoprotective properties. Besides assisting protein refolding and regulating proteostasis under stressful conditions, HSPs also play an important role in protecting cells from oxidative stress, inflammation, and apoptosis. Therefore, HSPs are crucial in counteracting the deleterious effects of hyperglycemia in target organs of diabetes vascular complications. Changes in HSP expression have been demonstrated in diabetic complications and functionally related to hyperglycemia-induced cell injury. Moreover, associations between diabetic complications and altered circulating levels of both HSPs and anti-HSPs have been shown in clinical studies. HSPs thus represent an exciting therapeutic opportunity and might also be valuable as clinical biomarkers. However, this field of research is still in its infancy and further studies in both experimental diabetes and humans are required to gain a full understanding of HSP relevance. In this review, we summarize current knowledge and discuss future perspective.
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Zhao Y, Shen Z, Zhang D, Luo H, Chen J, Sun Y, Xiao Q. Ghrelin ameliorates nerve growth factor Dysmetabolism and inflammation in STZ-induced diabetic rats. Metab Brain Dis 2017; 32:903-912. [PMID: 28357639 DOI: 10.1007/s11011-017-0001-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 03/23/2017] [Indexed: 01/07/2023]
Abstract
Diabetic encephalopathy is characterized by cognitive impairment and neuroinflammation, deficient neurotrophic support, and neuronal and synaptic loss. Ghrelin, a 28 amino acid peptide, is associated with neuromodulation and cognitive improvement, which has been considered as a potential protective agent for several neurodegenerative diseases. Here we sought to investigate the role of ghrelin in preventing diabetic-related neuropathology. We found that ghrelin attenuated astrocytic activation and reduced levels of interleukin-6 and tumor necrosis factor-α in streptozotocin-induced diabetic rats. In addition, ghrelin inhibited p38 mitogen-associated protein kinase activation. The upregulation of nerve growth factor (NGF) precursor and matrix metalloproteinase (MMP)-9 and downregulation of mature NGF and MMP-7 in the diabetic brain were reversed by ghrelin. Treatment with ghrelin elevated synaptophysin expression and synaptic density in diabetic rats. Taken together, our results demonstrate that ghrelin ameliorates diabetes-related neurodegeneration by preventing NGF dysmetabolism and synaptic degeneration through regulating MMP levels as well as inhibiting neuroinflammation.
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Affiliation(s)
- Yuxing Zhao
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Zhaoxing Shen
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Dongling Zhang
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Huiqiong Luo
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Jinliang Chen
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Yue Sun
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China
| | - Qian Xiao
- Department of Geriatrics, the First Affiliated Hospital of Chongqing Medical University, No. 1 YouYi Road, YuZhong District, Chongqing, 400016, China.
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Inhibition of iNOS alleviates cognitive deficits and depression in diabetic mice through downregulating the NO/sGC/cGMP/PKG signal pathway. Behav Brain Res 2017; 322:70-82. [DOI: 10.1016/j.bbr.2016.12.046] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/30/2016] [Accepted: 12/31/2016] [Indexed: 12/21/2022]
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Mastrocola R, Nigro D, Cento AS, Chiazza F, Collino M, Aragno M. High-fructose intake as risk factor for neurodegeneration: Key role for carboxy methyllysine accumulation in mice hippocampal neurons. Neurobiol Dis 2016; 89:65-75. [PMID: 26851500 DOI: 10.1016/j.nbd.2016.02.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/19/2016] [Accepted: 02/02/2016] [Indexed: 12/21/2022] Open
Abstract
Several studies indicate the involvement of advanced glycation end-products (AGEs) in neurodegenerative diseases. Moreover, the rising consumption of fructose in industrialized countries has been related to cognitive impairment, but the impact of fructose-derived AGEs on hippocampus has never been investigated. The present study aimed to evaluate in the hippocampus of C57Bl/6 mice fed a standard (SD) or a 60% fructose (HFRT) diet for 12 weeks the production of the most studied AGEs, carboxy methyllysine (CML), focusing on the role of the glutathione-dependent enzyme glyoxalase (Glo-1), the main AGEs-detoxifying system, in relation to early signs of neuronal impairment. HFRT diet evoked CML accumulation in the cell body of pyramidal neurons, followed by RAGE/NFkB signaling activation. A widespread reactive gliosis and altered mitochondrial respiratory complexes activity have been evidenced in HFRT hippocampi, paralleled by oxidative stress increase due to impaired activity of Nrf2 signaling. In addition, a translocation of Glo-1 from axons toward cell body of pyramidal neurons has been observed in HFRT mice, in relation to CML accumulation. Despite increased expression of dimeric Glo-1, its enzymatic activity was not upregulated in HFRT hippocampi, due to reduced glutathione availability, thus failing to prevent CML accumulation. The prevention of CML production by administration of the specific inhibitor pyridoxamine was able to prevent all the fructose-induced hippocampal alterations. In conclusion, a high-fructose consumption, through CML accumulation and Glo-1 impairment, induces in the hippocampus the same molecular and metabolic alterations observed in early phases of neurodegenerative diseases, and can thus represent a risk factor for their onset.
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Affiliation(s)
- Raffaella Mastrocola
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy.
| | - Debora Nigro
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Alessia S Cento
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Fausto Chiazza
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Massimo Collino
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Manuela Aragno
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
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Ghazanfarp R, Talebi E. Protective Role of Heat Shock Proteins in Cells Under Stress Condition: An Overview. ACTA ACUST UNITED AC 2013. [DOI: 10.17311/sciintl.2013.350.355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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