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Luo C, Nakagawa M, Sumi Y, Matsushima Y, Uemura M, Honda Y, Matsumoto N. Detection of senescent cells in the mucosal healing process on type 2 diabetic rats after tooth extraction for biomaterial development. Dent Mater J 2024:2023-262. [PMID: 38644214 DOI: 10.4012/dmj.2023-262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
The delayed mucosal healing of tooth extraction sockets in diabetes has few known effective treatment strategies, and its underlying mechanism remains unknown. Senescent cells may play a pivotal role in this delay, given the well-established association between diabetes, senescent cells, and wound healing. Here, we demonstrated an increase in p21- or p16-positive senescent cells in the epithelial and connective tissues of extraction sockets in type 2 diabetic rats compared to those in control rats. Between 7 and 14 days after tooth extraction, a decrease in senescent cells and improvement in re-epithelialization failure were observed in the epithelium, while an increase in senescent cells and persistence of inflammation were observed in the connective tissue. These results suggest that cellular senescence may have been induced by diabetes and contributed to delayed mucosal healing by suppressing re-epithelization and persistent inflammation. These findings provide new targets for treatment using biomaterials, cells, and drugs.
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Affiliation(s)
- Chuyi Luo
- Department of Orthodontics, Osaka Dental University
| | | | - Yoichi Sumi
- Department of Anatomy, Osaka Dental University
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Hara H, Imamura T, Suzuki A, Ueno M, Minagawa T, Ogawa T, Ishizuka O. Cold stress-induced bladder overactivity in type 2 diabetic mellitus rats is mitigated by the combination of a M 3 -muscarinic antagonist and a β 3 -adrenergic agonist. Low Urin Tract Symptoms 2023; 15:68-75. [PMID: 36543093 DOI: 10.1111/luts.12472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/17/2022] [Accepted: 12/04/2022] [Indexed: 12/24/2022]
Abstract
OBJECTIVES Goto-Kakizaki (GK) rats with type 2 diabetes mellitus respond to low temperature (LT) environments with bladder overactivity, including increased voiding frequency and decreased voiding interval and micturition volume. We determined if bladder overactivity could be inhibited by treatment with the combination of a M3 -muscarinic receptor antagonist and a β3 -adrenergic receptor agonist. METHODS Ten-week-old female GK rats were fed a high-fat diet for 4 weeks. Cystometric investigations were conducted at room temperature (RT, 27 ± 2°C). The rats were then intraperitoneally administered the vehicle, the M3 -muscarinic receptor antagonist solifenacin, the β3 -adrenergic agonist mirabegron, or a combination of solifenacin and mirabegron. Ten minutes after the administrations, the rats were transferred to the LT environment (4 ± 2°C), where the cystometric measurements were continued. The expressions of both M3 -muscarinic and β3 -adrenergic receptors were investigated. RESULTS After transfer from RT to LT, both voiding interval and bladder capacity of the vehicle-, solifenacin-, or mirabegron-treated rats were significantly decreased. However, the combination of solifenacin and mirabegron significantly mitigated the bladder overactivity. While both M3 -muscarinic and β3 -adrenergic receptors were detected, the expression of M3 -muscarinic receptor mRNA was significantly higher than that of β3 -adrenergic receptor mRNA. CONCLUSIONS The cold stress-induced bladder overactivity was not improved by either the M3 -muscarinic receptor antagonist or the β3 -adrenergic receptor agonist alone. However, the combined treatment mitigated the cold stress responses. Combined therapy with M3 -muscarinic antagonists and β3 -adrenergic agonists could reduce side effects and improve the quality of life for diabetic patients with bladder overactivity.
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Affiliation(s)
- Hiroaki Hara
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Tetsuya Imamura
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Ataru Suzuki
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Manabu Ueno
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Tomonori Minagawa
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Teruyuki Ogawa
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Osamu Ishizuka
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
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Liu J, Bailbé D, Raynal S, Carbonne C, Zhen D, Dairou J, Gausseres B, Armanet M, Domet T, Pitasi CL, Movassat J, Lim CK, Guillemin GJ, Autier V, Kergoat M, Portha B. Kynurenine-3-monooxygenase expression is activated in the pancreatic endocrine cells by diabetes and its blockade improves glucose-stimulated insulin secretion. Biochim Biophys Acta Mol Basis Dis 2022; 1868:166509. [PMID: 35914653 DOI: 10.1016/j.bbadis.2022.166509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 07/25/2022] [Accepted: 07/25/2022] [Indexed: 11/25/2022]
Abstract
Type 2 diabetes is associated with an inflammatory phenotype in the pancreatic islets. We previously demonstrated that proinflammatory cytokines potently activate the tryptophan/kynurenine pathway (TKP) in INS-1 cells and in normal rat islets. Here we examined: (1) the TKP enzymes expression in the diabetic GK islets; (2) the TKP enzymes expression profiles in the GK islets before and after the onset of diabetes; (3) The glucose-stimulated insulin secretion (GSIS) in vitro in GK islets after KMO knockdown using specific morpholino-oligonucleotides against KMO or KMO blockade using the specific inhibitor Ro618048; (4) The glucose tolerance and GSIS after acute in vivo exposure to Ro618048 in GK rats. We report a remarkable induction of the kmo gene in GK islets and in human islets exposed to proinflammatory conditions. It occurred prominently in beta cells. The increased expression and activity of KMO reflected an acquired adaptation. Both KMO knockdown and specific inhibitor Ro618048 enhanced GSIS in vitro in GK islets. Moreover, acute administration of Ro618048 in vivo improved glucose tolerance, GSIS and basal blood glucose levels in GK rats. These results demonstrate that targeting islet TKP is able to correct defective GSIS. KMO inhibition could represent a potential therapeutic strategy for type 2 diabetes.
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Affiliation(s)
- Junjun Liu
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France; Shandong Institute of Endocrine and Metabolic Diseases, Shandong First Medical University, Jinan, Shandong, China; MetaBrain Research, Maisons-Alfort, France.
| | - Danielle Bailbé
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France
| | | | | | - Delong Zhen
- Shandong Institute of Endocrine and Metabolic Diseases, Shandong First Medical University, Jinan, Shandong, China
| | - Julien Dairou
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR8601, Université Paris-Cité, Paris, France
| | - Blandine Gausseres
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France
| | - Mathieu Armanet
- Cell Therapy Unit, Hôpital Saint-Louis, AP-HP, Université Paris-Cité, Paris, France
| | - Thomas Domet
- Cell Therapy Unit, Hôpital Saint-Louis, AP-HP, Université Paris-Cité, Paris, France
| | - Caterina L Pitasi
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France
| | - Jamileh Movassat
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France
| | - Chai K Lim
- Neuroinflammation Group, Macquarie Medicine School, Macquarie University, Sydney, Australia
| | - Gilles J Guillemin
- Neuroinflammation Group, Macquarie Medicine School, Macquarie University, Sydney, Australia
| | | | | | - Bernard Portha
- Laboratoire B2PE (Biologie et Pathologie du Pancréas Endocrine), Unité BFA (Biologie Fonctionnelle et Adaptive), CNRS UMR 8251, Université Paris-Cité, Paris, France.
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John A, Amiri L, Shafarin J, Tariq S, Adeghate E, Howarth FC, Raza H. Alterations in Energy Metabolism, Mitochondrial Function and Redox Homeostasis in GK Diabetic Rat Tissues Treated with Aspirin. Life (Basel) 2022; 12:104. [PMID: 35054496 DOI: 10.3390/life12010104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/04/2022] [Accepted: 01/10/2022] [Indexed: 11/22/2022]
Abstract
Our recent studies have demonstrated that aspirin treatment prevents inflammatory and oxidative stress-induced alterations in mitochondrial function, improves glucose tolerance and pancreatic endocrine function and preserves tissue-specific glutathione (GSH)-dependent redox homeostasis in Goto-Kakizaki (GK) diabetic rats. In the current study, we have investigated the mechanism of action of aspirin in maintaining mitochondrial bioenergetics and redox metabolism in the liver and kidneys of GK rats. Aspirin reduced the production of reactive oxygen species (ROS) and oxidative stress-induced changes in GSH metabolism. Aspirin treatment also improved mitochondrial respiratory function and energy metabolism, in addition to regulating the expression of cell signaling proteins that were altered in diabetic animals. Ultrastructural electron microscopy studies revealed decreased accumulation of glycogen in the liver of aspirin-treated diabetic rats. Hypertrophic podocytes with irregular fusion of foot processes in the renal glomerulus and detached microvilli, condensed nuclei and degenerated mitochondria observed in the proximal convoluted tubules of GK rats were partially restored by aspirin. These results provide additional evidence to support our previous observation of moderation of diabetic complications by aspirin treatment in GK rats and may have implications for cautious use of aspirin in the therapeutic management of diabetes.
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Zhang N, Zheng Q, Wang Y, Lin J, Wang H, Liu R, Yan M, Chen X, Yang J, Chen X. Renoprotective Effect of the Recombinant Anti-IL-6R Fusion Proteins by Inhibiting JAK2/STAT3 Signaling Pathway in Diabetic Nephropathy. Front Pharmacol 2021; 12:681424. [PMID: 34054555 PMCID: PMC8155588 DOI: 10.3389/fphar.2021.681424] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/04/2021] [Indexed: 02/06/2023] Open
Abstract
Diabetic nephropathy the main reason for end stage renal disease is a common microvascular complication in patients with type 1 and type 2 diabetes. The interleukin-6 (IL-6), acting as a pleiotropic cytokine, play key roles in main autoimmune disorders. The recombinant anti-IL-6R fusion proteins (VHH-0031) constructed and obtained in our lab is a dual target-directed single domain-based fusion protein against the interleukin-6 receptor. This study aims to explore the renoprotective effect of VHH-0031 in diabetic nephropathy. VHH-0031 treatment alleviated renal inflammation, morphologic injury and renal insufficiency in both Goto-Kakizaki rats and STZ-induced Sprague Dawley rats. These renoprotective effects of VHH-0031 are associated with alleviating inflammation and suppression of the JAK2/STAT3 signaling pathway. The mesangial cells treated with VHH-0031 exhibited anti-proliferation, anti-inflammation and inactivation of JAK2/STAT3 pathway under high glucose condition. In conclusion, this study demonstrates that VHH-0031 exhibited a potent protective effect in kidney of diabetic rats and its mechanism may be concerned with the inhibition of the IL-6R/JAK2/STAT3 pathway of glomerular mesangial cells.
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Affiliation(s)
- Nanwen Zhang
- School of Pharmacy, Department of Pharmacology, Fujian Medical University, Fuzhou, China.,Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, School of Pharmacy, Fujian Medical University, Fuzhou, China
| | - Qingmei Zheng
- School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - Yaduan Wang
- School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - Juan Lin
- School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - He Wang
- School of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Rui Liu
- School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - Mengru Yan
- School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - Xiaofeng Chen
- Rehabilitation Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Juhua Yang
- Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, School of Pharmacy, Fujian Medical University, Fuzhou, China.,School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
| | - Xiaole Chen
- Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research, School of Pharmacy, Fujian Medical University, Fuzhou, China.,School of Pharmacy, Department of Bioengineering and Biopharmaceutics, Fujian Medical University, Fuzhou, China
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Bailbe D, Liu J, Gong P, Portha B. Effect of Postnatal Nutritional Environment Due to Maternal Diabetes on Beta Cell Mass Programming and Glucose Intolerance Risk in Male and Female Offspring. Biomolecules 2021; 11:179. [PMID: 33525575 DOI: 10.3390/biom11020179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 11/20/2022] Open
Abstract
Besides the fetal period, the suckling period is a critical time window in determining long-term metabolic health. We undertook the present study to elucidate the impact of a diabetic suckling environment alone or associated with an in utero diabetic environment on beta cell mass development and the risk of diabetes in the offspring in the long term. To that end, we have compared two experimental settings. In setting 1, we used Wistar (W) rat newborns resulting from W ovocytes (oW) transferred into diabetic GK rat mothers (pGK). These oW/pGK neonates were then suckled by diabetic GK foster mothers (oW/pGK/sGK model) and compared to oW/pW neonates suckled by normal W foster mothers (oW/pW/sW model). In setting 2, normal W rat newborns were suckled by diabetic GK rat foster mothers (nW/sGK model) or normal W foster mothers (nW/sW model). Our data revealed that the extent of metabolic disorders in term of glucose intolerance and beta cell mass are similar between rats which have been exposed to maternal diabetes both pre- and postnatally (oW/pGK/sGK model) and those which have been exposed only during postnatal life (nW/sW model). In other words, being nurtured by diabetic GK mothers from birth to weaning was sufficient to significantly alter the beta cell mass, glucose-induced insulin secretion and glucose homeostasis of offspring. No synergistic deleterious effects of pre-and postnatal exposure was observed in our setting.
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Kang X, Zhan L, Lu X, Song J, Zhong Y, Wang Y, Yang Y, Fan Z, Jiang X, Sun R. Characteristics of Gastric Microbiota in GK Rats with Spontaneous Diabetes: A Comparative Study. Diabetes Metab Syndr Obes 2020; 13:1435-1447. [PMID: 32431527 PMCID: PMC7201022 DOI: 10.2147/dmso.s242698] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 04/07/2020] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The Goto-Kakizaki (GK) rat, developed from repeated inbreeding of glucose-intolerant Wistar rats, has been widely used to explore the development of spontaneous type-2 diabetes mellitus (T2DM). However, the gastric microbiota of GK and Wistar rats are still unclear. This study aimed to understand the gastric microbiota characteristics of GK rats by comparing it with non-diabetic Wistar rats. MATERIALS AND METHODS Male Wistar rats and GK rats were housed in specific pathogen-free (SPF) environment for 12 weeks with free access to sterilized food and water. Body weight and random blood glucose (BG) levels were determined. At the end of the experiment, the gastric contents of the rats were collected for the identification of gastric microbiota using 16S rRNA gene sequencing. RESULTS The richness of gastric microbiota in GK rats was similar to that of Wistar rats (P > 0.05). The results of Shannon, Simpson, beta diversity indices, and ANOSIM analysis showed that alpha and beta diversity of gastric microbiota in GK rats were significantly lower than that of Wistar rats (P < 0.01). Firmicutes (96.0%), Proteobacteria (1.9%) and Cyanobacteria (0.8%) were the dominant gastric microbiota in GK rats accounting for 72.9%, 14.7% and 10.9%, respectively. Linear discriminant analysis effect size (LEfSe) revealed that phylum Firmicutes and four genera (Anaerovibrio, Collinsella, Prevotellaceae_UCG_001, and Lactobacillus) were significantly abundant in the stomachs of GK rats. In contrast, seven genera (unidentified_Chloroplast, Porphyromonas, Neisseria, Rubrobacter, Veillonella, Lachnospiraceae_UCG_005, and unidentified_Erysipelotrichaceae) were significantly abundant in the stomachs of Wistar rats. Blood glucose was positively correlated with Anaerobibrio and Lactobacillus, and negatively correlated with four genera (Porphyromonas, Rubrobacter, Lachnospiraceae_UCG_005, and unidentified_Erysipelotrichaceae). In addition, chemoheterotrophy and fermentation were the most important functions of gastric microbiota. CONCLUSION The gastric microbiota of GK rats with spontaneous T2DM showed the typical characteristics of low diversity and significant enrichment of Firmicutes phylum and four genera (Anaerovibrio, Collinsella, Prevotellaceae_UCG_001, and Lactobacillus) compared with gastric microbiota of Wistar rats.
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Affiliation(s)
- Xin Kang
- Institute of Integrative Medicine, Dalian Medical University, Dalian, Liaoning, People’s Republic of China
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
| | - Libin Zhan
- Institute of Integrative Medicine, Dalian Medical University, Dalian, Liaoning, People’s Republic of China
- Basic Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, People’s Republic of China
- Correspondence: Libin Zhan Institute of Integrative Medicine, Dalian Medical University, Dalian, Liaoning, People’s Republic of China, Basic Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, People’s Republic of ChinaTel +86 25-85811569 Email
| | - Xiaoguang Lu
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
- Xiaoguang Lu Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China Email
| | - Jianbo Song
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
| | - Yilong Zhong
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
| | - Yi Wang
- Institute of Integrative Medicine, Dalian Medical University, Dalian, Liaoning, People’s Republic of China
| | - Yilun Yang
- Graduate School, Zunyi Medical University, Zunyi, Guizhou, Republic of China
| | - Zhiwei Fan
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
| | - Xiaozheng Jiang
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
| | - Ruru Sun
- Department of Emergency Medicine, Affiliated Zhongshan Hospital, Dalian University, Dalian, Liaoning, People’s Republic of China
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Li J, Xu S, Liu Y, Yan Z, Zhang F, Lv Q, Tong N. Activated PPARβ/δ Protects Pancreatic β Cells in Type 2 Diabetic Goto-Kakizaki Rats from Lipoapoptosis via GPR40. Lipids 2019; 54:603-616. [PMID: 31364177 DOI: 10.1002/lipd.12182] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 06/17/2019] [Accepted: 07/08/2019] [Indexed: 02/05/2023]
Abstract
GW501516-activated peroxisome proliferator-activated receptor (PPAR) β/δ and G-protein-coupled receptor (GPR) 40 were shown to protect pancreatic β cells against lipoapoptosis. Therefore, this study aimed to investigate whether activated PPARβ/δ could protect type 2 diabetic rats from lipoapoptosis through regulation of GPR40 and to compare the protective effects of activated PPARβ/δ and PPARγ. We made an animal model of type 2 diabetic lipoapoptosis by feeding spontaneously type 2 diabetic Goto-Kakizaki (GK) rats with a high-fat diet (HFD) to evaluate the effects of PPARβ/δ on islet β cell apoptosis. And, treated INS-1 cells with 0.5 mM palmitate (PAM) in the absence/presence of GW501516 (a specific agonist of PPAR β/δ) and with/without transfection of GPR40 siRNA to explore the underlying molecular mechanism. HFD aggravated GK rats' poorer INSR30, lower mass, greater apoptosis of β cells, lower mass, and lower expression of GPR40, which were similarly improved by GW501516 at 3 or 6 mg/kg day and pioglitazone. Compared with pioglitazone, GW501516 caused more weight loss and had no effect on insulin resistance. GW501516 protected INS-1 cells from PAM-induced apoptosis by upregulating GPR40 and activating Akt/Bcl-2/caspase-3. Activated extracellular regulated protein kinases (ERK) was relevant to the lipoapoptosis in INS-1 cells, but was not involved in the antilipoapoptotic effect of GW501516. These results showed that the PPARβ/δ agonist GW501516 protected β cells from lipoapoptosis and improved β cell mass by upregulating GPR40 and activating the Akt/Bcl-2/caspase-3 pathway, but not the ERK-signaling pathway.
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Affiliation(s)
- Juan Li
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Shishi Xu
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Yuqi Liu
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Zhe Yan
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Fang Zhang
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Qingguo Lv
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
| | - Nanwei Tong
- Department of Endocrinology and Metabolism, West China Hospital of Sichuan University, 37 Guoxuexiang, Chengdu, 610041, China
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Movassat J, Delangre E, Liu J, Gu Y, Janel N. Hypothesis and Theory: Circulating Alzheimer's-Related Biomarkers in Type 2 Diabetes. Insight From the Goto-Kakizaki Rat. Front Neurol 2019; 10:649. [PMID: 31293498 PMCID: PMC6606723 DOI: 10.3389/fneur.2019.00649] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 06/03/2019] [Indexed: 12/16/2022] Open
Abstract
Epidemiological data suggest an increased risk of developing Alzheimer's disease (AD) in individuals with type 2 diabetes (T2D). AD is anatomically associated with an early progressive accumulation of Aβ leading to a gradual Tau hyperphosphorylation, which constitute the main characteristics of damaged brain in AD. Apart from these processes, mounting evidence suggests that specific features of diabetes, namely impaired glucose metabolism and insulin signaling in the brain, play a key role in AD. Moreover, several studies report a potential role of Aβ and Tau in peripheral tissues such as pancreatic β cells. Thus, it appears that several biological pathways associated with diabetes overlap with AD. The link between peripheral insulin resistance and brain insulin resistance with concomitant cognitive impairment may also potentially be mediated by a liver/pancreatic/brain axis, through the excessive trafficking of neurotoxic molecules across the blood-brain barrier. Insulin resistance incites inflammation and pro-inflammatory cytokine activation modulates the homocysteine cycle in T2D patients. Elevated plasma homocysteine level is a risk factor for AD pathology and is also closely associated with metabolic syndrome. We previously demonstrated a strong association between homocysteine metabolism and insulin via cystathionine beta synthase (CBS) activity, the enzyme implicated in the first step of the trans-sulfuration pathway, in Goto-Kakizaki (GK) rats, a spontaneous model of T2D, with close similarities with human T2D. CBS activity is also correlated with DYRK1A, a serine/threonine kinase regulating brain-derived neurotrophic factor (BDNF) levels, and Tau phosphorylation, which are implicated in a wide range of disease such as T2D and AD. We hypothesized that DYRK1A, BDNF, and Tau, could be among molecular factors linking T2D to AD. In this focused review, we briefly examine the main mechanisms linking AD to T2D and provide the first evidence that certain circulating AD biomarkers are found in diabetic GK rats. We propose that the spontaneous model of T2D in GK rat could be a suitable model to investigate molecular mechanisms linking T2D to AD.
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Affiliation(s)
- Jamileh Movassat
- Univ Paris Diderot-Sorbonne Paris Cité, Laboratoire de Biologie et Pathologie du Pancréas Endocrine, Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR 8251 CNRS, Paris, France
| | - Etienne Delangre
- Univ Paris Diderot-Sorbonne Paris Cité, Laboratoire de Biologie et Pathologie du Pancréas Endocrine, Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR 8251 CNRS, Paris, France
| | - Junjun Liu
- Univ Paris Diderot-Sorbonne Paris Cité, Laboratoire de Biologie et Pathologie du Pancréas Endocrine, Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR 8251 CNRS, Paris, France
| | - YuChen Gu
- Univ Paris Diderot-Sorbonne Paris Cité, Laboratoire Processus Dégénératifs, Stress et Vieillissement, Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR 8251 CNRS, Paris, France
| | - Nathalie Janel
- Univ Paris Diderot-Sorbonne Paris Cité, Laboratoire Processus Dégénératifs, Stress et Vieillissement, Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR 8251 CNRS, Paris, France
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Liang Y, Liu Y, Lai W, Du M, Li S, Zhou L, Mo Y, Wang P, Min Y, Cui L. 1,25-Dihydroxy vitamin D3 treatment attenuates osteopenia, and improves bone muscle quality in Goto-Kakizaki type 2 diabetes model rats. Endocrine 2019; 64:184-195. [PMID: 30826991 PMCID: PMC6454079 DOI: 10.1007/s12020-019-01857-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 01/28/2019] [Indexed: 12/25/2022]
Abstract
PURPOSE Osteopenia and skeletal fragility are considered to be the complications associated with type 2 diabetes mellitus (T2DM). The relationship between glucose metabolism, skeletal quality, and vitamin D have not been completely understood. We aimed to demonstrate a comprehensive bone quality profile in a T2DM model subject and to investigate whether 1, 25-dihydroxy vitamin D3 could prevent osteopenia and skeletal fragility in the diabetes model rats. METHODS Daily calcitriol (a 1, 25-dihydroxy vitamin D3 formulation, 0.045 μg/kg/day) treatment was administered to 21-week-old male Goto-Kakizaki (GK) rats (a genetic non-obese and non-insulin-dependent spontaneous diabetes rat model) for 20 weeks and the results were compared with those in untreated GK rats, and wild-type animals. RESULTS Micro-computed tomography, histomorphometry, and bone mineral density analysis demonstrated that T2DM induced significant osteopenia, and impairment of bone microarchitecture and biomechanical properties in GK rats. T2DM also significantly decreased bone formation and increased bone resorption parameters in three regions of the skeleton (proximal tibia, mid-shaft of the tibia, and lumbar vertebrae), and increased carboxy-terminal type I collagen crosslinks, tartrate-resistant acid phosphatase, muscle ubiquitin C, and bone thioredoxin interacting protein (TXNIP) expression. Calcitriol treatment significantly alleviated bone loss, and improved bone microarchitecture and biomechanical properties and also decreased serum glucose and glycated serum protein levels. Biomarkers of bone formation were significantly increased, while muscle ubiquitin C and bone TXNIP expression were significantly decreased following calcitriol treatment. CONCLUSIONS These results suggest that 1,25-dihydroxy vitamin D3 treatment effectively attenuates osteopenia, and improves bone and muscle quality in GK type 2 diabetes model rats.
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Affiliation(s)
- Yanlong Liang
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Yanzhi Liu
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 518055, Shenzhen, China
| | - Wenxiu Lai
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Minqun Du
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Shuhui Li
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Limin Zhou
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Yulin Mo
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Pan Wang
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Yalin Min
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China
| | - Liao Cui
- Guangdong Key laboratory for Research and Development of Natural Drugs, Department of Pharmacology, Guangdong Medical University, 524023, Zhanjiang, China.
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Meng Y, Cui Y, Zhang W, Fu S, Huang L, Dong H, Du H. Integrative Analysis of Genome and Expression Profile Data Reveals the Genetic Mechanism of the Diabetic Pathogenesis in Goto Kakizaki (GK) Rats. Front Genet 2019; 9:724. [PMID: 30687391 PMCID: PMC6335273 DOI: 10.3389/fgene.2018.00724] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/22/2018] [Indexed: 12/18/2022] Open
Abstract
The Goto Kakizaki (GK) rats which can spontaneously develop type 2 diabetes (T2D), are generated by repeated inbreeding of Wistar rats with glucose intolerance. The glucose intolerance in GK rat is mainly attributed to the impairment in glucose-stimulated insulin secretion (GSIS). In addition, GK rat display a decrease in beta cell mass, and a change in insulin action. However, the genetic mechanism of these features remain unclear. In the present study, we analyzed the population variants of GK rats and control Wistar rats by whole genome sequencing and identified 1,839 and 1,333 specific amino acid changed (SAAC) genes in GK and Wistar rats, respectively. We also detected the putative artificial selective sweeps (PASS) regions in GK rat which were enriched with GK fixed variants and were under selected in the initial diabetic-driven derivation by homogeneity test with the fixed and polymorphic sites between GK and Wistar populations. Finally, we integrated the SAAC genes, PASS region genes and differentially expressed genes in GK pancreatic beta cells to reveal the genetic mechanism of the impairment in GSIS, a decrease in beta cell mass, and a change in insulin action in GK rat. The results showed that Slc2a2 gene was related to impaired glucose transport and Adcy3, Cacna1f, Bmp4, Fam3b, and Ptprn2 genes were related to Ca2+ channel dysfunction which may responsible for the impaired GSIS. The genes Hnf4g, Bmp4, and Bad were associated with beta cell development and may be responsible for a decrease in beta cell mass while genes Ide, Ppp1r3c, Hdac9, Ghsr, and Gckr may be responsible for the change in insulin action in GK rats. The overexpression or inhibition of Bmp4, Fam3b, Ptprn2, Ide, Hnf4g, and Bad has been reported to change the glucose tolerance in rodents. However, the genes Bmp4, Fam3b, and Ptprn2 were found to be associated with diabetes in GK rats for the first time in the present study. Our findings provide a comprehensive genetic map of the abnormalities in GK genome which will be helpful in understand the underlying genetic mechanism of pathogenesis of diabetes in GK rats.
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Affiliation(s)
- Yuhuan Meng
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Ying Cui
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Wenlu Zhang
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Shuying Fu
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Lizhen Huang
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Hua Dong
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
| | - Hongli Du
- School of Biology and Biological Engineering - Department of Biomedical Engineering, South China University of Technology, Guangzhou, China
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12
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Zhang W, Wu Y, Fan W, Chen H, Du H, Rao J. The pattern of plasma BCAA concentration and liver Bckdha gene expression in GK rats during T2D progression. Animal Model Exp Med 2018; 1:305-313. [PMID: 30891580 PMCID: PMC6388062 DOI: 10.1002/ame2.12038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 09/04/2018] [Accepted: 09/26/2018] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND This study was conducted to measure the concentration of branched chain amino acid (BCAA) in different species and detect the expression pattern of the liver Bckdha gene in Goto-Kakizaki (GK) rats during type 2 diabetes (T2D) progression. METHODS We measured the concentration of BCAA in GK rats, induced T2D cynomolgus monkeys and T2D humans by liquid chromatography tandem mass spectrometry, and used real-time quantitative PCR to analyze the gene expression of Bckdha and Bckdk, which encode the rate-limiting enzymes in catabolism of, respectively, branched chain amino acids and branched chain α-keto acid dehydrogenase kinase. RESULTS In this study, we showed that GK rat BCAA concentrations were significantly reduced at 4 and 8 weeks (P < 0.05 and P < 0.01, respectively), while the expression of Bckdha in GK rat liver was increased at 4 and 8 weeks (1.62-fold and 1.93-fold, respectively). The BCAA concentrations were significantly reduced in diet-induced T2D cynomolgus monkeys (P < 0.01), but significantly increased in T2D humans (P < 0.001). CONCLUSIONS Our results showed that BCAA concentrations changed at different times and by different amounts in different species and during different periods of T2D progress, and the significant changes of BCAA concentration in the three species indicated that BCAA might participate in the progress of T2D. The results suggested that the increased expression of Bckdha in GK rat liver might partially explain the reduced plasma BCAA concentration at 4 and 8 weeks. Further studies are required to investigate the exact mechanism of BCAA changes in non-obese T2D.
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Affiliation(s)
- Wenlu Zhang
- School of Biological and Biological EngineeringSouth China University of TechnologyGuangzhouChina
| | - Yu'e Wu
- Guangdong Key Laboratory of Laboratory AnimalsGuangzhouChina
| | - Wei Fan
- School of Biological and Biological EngineeringSouth China University of TechnologyGuangzhouChina
| | | | - Hongli Du
- School of Biological and Biological EngineeringSouth China University of TechnologyGuangzhouChina
| | - Junhua Rao
- Guangdong Key Laboratory of Animal Conservation and Resource UtilizationGuangdong Public Laboratory of Wild Animal Conservation and UtilizationGuangdong Institute of Applied Biological ResourcesGuangzhouChina
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Imai E, Shibata K. Oral Glucose Tolerance and Tryptophan Metabolism in Non-Obese and Non-Insulin-Dependent Diabetic Goto-Kakizaki Rats Fed High-Tryptophan Diets. J Nutr Sci Vitaminol (Tokyo) 2018; 64:48-55. [PMID: 29491272 DOI: 10.3177/jnsv.64.48] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We investigated oral glucose tolerance and tryptophan (Trp) metabolism in non-obese and non-insulin-dependent diabetic Goto-Kakizaki (GK) rats fed high-Trp diets. Five-week-old male Wistar and GK rats were fed a 20% casein diet (control diet) or the same diet supplemented with 1%, 2%, 3%, or 5% Trp for 58 d. Oral glucose tolerance tests were performed on Days 14 and 28 of the experimental period. Urine as well as livers and blood were collected on the last day of the experiment. The glucose concentration and the amount of Trp metabolites were measured. On Day 14 of the experiment, the incremental blood glucose concentrations integrated over a period of 2 h (ΔAUC0-2h) of blood glucose in rats fed the 3% and 5% Trp diets had decreased by 13% and 18%, respectively, compared with that of the control-GK rats. However, no significant differences were found in the rats fed +1% or +2% Trp diets compared with control-GK rats. On Day 28, there were no significant differences found in the ΔAUC0-2h of blood glucose levels in any group including the control-GK group. On the last day, the concentrations of plasma glucose, total cholesterol, and triglyceride did not show differences in any group. There were no specific phenomena observed in the metabolism of Trp in GK rats even when fed an excess of Trp, compared with that of Wistar rats. Oral Trp administration and its continuous use may not improve blood glucose levels in type 2 diabetic rats.
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Affiliation(s)
- Eri Imai
- Department of Nutrition, School of Human Cultures, The University of Shiga Prefecture
| | - Katsumi Shibata
- Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women's University
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Ando A, Gantulga D, Nakata M, Maekawa F, Dezaki K, Ishibashi S, Yada T. Weaning stage hyperglycemia induces glucose-insensitivity in arcuate POMC neurons and hyperphagia in type 2 diabetic GK rats. Neuropeptides 2018. [PMID: 29525472 DOI: 10.1016/j.npep.2018.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Hyperphagia triggers and accelerates diabetes, and prevents proper dietary control of glycemia. Inversely, the impact of hyperglycemia on hyperphagia and possible mechanistic cause common for these two metabolic disorders in type 2 diabetes are less defined. The present study examined the precise developmental process of hyperglycemia and hyperphagia and explored the alterations in the hypothalamic arcuate nucleus (ARC), the primary feeding and metabolic center, in Goto-Kakizaki (GK) rats with type 2 diabetes and nearly normal body weight. At mid 3 to 4 weeks of age, GK rats first exhibited hyperglycemia, and then hyperphagia and reduced mRNA expressions for anorexigenic pro-opiomelanocortin (POMC) and glucokinase in ARC. Furthermore, [Ca2+]i responses to high glucose in ARC POMC neurons were impaired in GK rats at 4 weeks. Treating GK rats from early 3 to mid 6 weeks of age with an anti-diabetic medicine miglitol not only suppressed hyperglycemia but ameliorated hyperphagia and restored POMC mRNA expression in ARC. These results suggest that the early hyperglycemia occurring in weaning period may lead to impaired glucose sensing and neuronal activity of POMC neurons, and thereby induce hyperphagia in GK rats. Correction of hyperglycemia in the early period may prevent and/or ameliorate the progression of hyperphagia in type 2 diabetes.
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Affiliation(s)
- A Ando
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan; Division of Endocrinology and Metabolism, Department of Internal Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan
| | - D Gantulga
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan
| | - M Nakata
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan
| | - F Maekawa
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba-City, Ibaragi 305-8506, Japan
| | - K Dezaki
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan
| | - S Ishibashi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan
| | - T Yada
- Division of Integrative Physiology, Department of Physiology, Jichi Medical University School of Medicine, 3311-1 Yakushiji, Shimotsuke, Tochigi 320-0498, Japan; Kansai Electric Power Medical Research Institute, 1-5-6 Minatojimaminamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan.
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15
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Purwana I, Liu JJ, Portha B, Buteau J. HSF1 acetylation decreases its transcriptional activity and enhances glucolipotoxicity-induced apoptosis in rat and human beta cells. Diabetologia 2017; 60:1432-1441. [PMID: 28547133 DOI: 10.1007/s00125-017-4310-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 04/13/2017] [Indexed: 01/08/2023]
Abstract
AIMS/HYPOTHESIS Heat shock factor protein 1 (HSF1) is a transcription factor that regulates the expression of key molecular chaperones, thereby orchestrating the cellular response to stress. This system was recently implicated in the control of insulin sensitivity and is therefore being scrutinised as a novel therapeutic avenue for type 2 diabetes. However, the regulation and biological actions of HSF1 in beta cells remain elusive. Herein, we sought to investigate the regulation of HSF1 in pancreatic beta cells and to study its potential role in cell survival. METHODS We exposed human islets and beta cell lines to glucolipotoxicity and thapsigargin. HSF1 activity was evaluated by gel shift assay. HSF1 acetylation and interaction with the protein acetylase cAMP response element binding protein (CBP) were investigated by western blot. We measured the expression of HSF1 and its canonical targets in islets from Goto-Kakizaki (GK) rat models of diabetes and delineated the effects of HSF1 acetylation using mutants mimicking constitutive acetylation and deacetylation of the protein. RESULTS Glucolipotoxicity promoted HSF1 acetylation and interaction with CBP. Glucolipotoxicity-induced HSF1 acetylation inhibited HSF1 DNA binding activity and decreased the expression of its target genes. Restoration of HSF1 activity in beta cells prevented glucolipotoxicity-induced endoplasmic reticulum stress and apoptosis. However, overexpression of a mutant protein (K80Q) mimicking constitutive acetylation of HSF1 failed to confer protection against glucolipotoxicity. Finally, we showed that expression of HSF1 and its target genes were altered in islets from diabetic GK rats, suggesting that this pathway could participate in the pathophysiology of diabetes and constitutes a potential site for therapeutic intervention. CONCLUSIONS/INTERPRETATION Our results unravel a new mechanism by which HSF1 inhibition is required for glucolipotoxicity-induced beta cell apoptosis. Restoring HSF1 activity may represent a novel strategy for the maintenance of a functional beta cell mass. Our study supports the therapeutic potential of HSF1/heat shock protein-targeting agents in diabetes treatment.
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Affiliation(s)
- Indri Purwana
- Alberta Diabetes Institute, University of Alberta, Li Ka Shing Centre, Edmonton, AB, T6G 2E1, Canada
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada
| | - Jun J Liu
- Laboratoire Biologie et Pathologie du Pancréas Endocrine (B2PE), Unité Biologie Fonctionnelle et Adaptive (BFA), Centre national de la recherche scientifique (CNRS), Unité mixte de recherche (UMR) 8251, Université Paris Diderot, Sorbonne-Paris-Cité, Paris, France
| | - Bernard Portha
- Laboratoire Biologie et Pathologie du Pancréas Endocrine (B2PE), Unité Biologie Fonctionnelle et Adaptive (BFA), Centre national de la recherche scientifique (CNRS), Unité mixte de recherche (UMR) 8251, Université Paris Diderot, Sorbonne-Paris-Cité, Paris, France
| | - Jean Buteau
- Alberta Diabetes Institute, University of Alberta, Li Ka Shing Centre, Edmonton, AB, T6G 2E1, Canada.
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.
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Tsutsumi E, Murata Y, Sakamoto M, Horikawa E. Effects of exercise on the nephron of Goto-Kakizaki rats: morphological, and advanced glycation end-products and inducible nitric oxide synthase immunohistochemical analyses. J Diabetes Complications 2015; 29:472-8. [PMID: 25817171 DOI: 10.1016/j.jdiacomp.2015.03.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2014] [Revised: 01/23/2015] [Accepted: 03/02/2015] [Indexed: 11/23/2022]
Abstract
The current study aimed to examine how exercise affects morphology of the nephron, and localization of advanced glycation end-products (AGEs) and inducible nitric oxide synthase (iNOS) immunoreactivity in diabetic Goto-Kakizaki rats. Four groups of male rats were studied. WIS SED (Wistar rats; sedentary) group served as a control. Other groups were WIS EX (Wistar rats; exercise), GK SED (Goto-Kakizaki diabetic rats; sedentary) and GK EX (Goto-Kakizaki diabetic rats; exercise) groups. The rats in EX groups were subjected to 15weeks of treadmill running at a speed of 15m/min for a total of 30minutes, three times a week. Changes in the structure of renal corpuscles and in the distribution of AGEs- and iNOS-immunoreactive cells of the uriniferous tubules were evaluated. Every parameter of GK EX was significantly different from that of GK SED (area of Bowman's capsules: p<0.001, area of glomeruli: p<0.05 and the occupancy of a glomerulus: p<0.05). These findings suggest that exercise may ameliorate glomerular filtration rate (GFR). The localizations of AGEs and iNOS immunostaining in the uriniferous tubules were similar in each group. Immunohistochemical assays revealed that the number of the AGEs and iNOS immunopositive cells of the proximal tubule of cortico-deep layer in EX groups were markedly greater than those in SED groups and that iNOS expression in GK EX was significantly higher than GK SED (p<0.05). Exercise seems to normalize the GFR and glomerular filtrate absorption from the uriniferous tubules in Goto-Kakizaki diabetic rats with the recovered shape of renal corpuscles and may be involved in the absorption and catabolization of AGEs with iNOS-related reactions for reabsorption.
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Affiliation(s)
- Eriko Tsutsumi
- Faculty of Rehabilitation Sciences, Nishikyushu University, 4490-9 Ozaki, Kanzaki, Saga, 842-8585, Japan; Center for Comprehensive and Community Medicine school of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849- 8501, Japan.
| | - Yuzo Murata
- Department of Anatomy and Physiology, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849- 8501, Japan.
| | - Maiko Sakamoto
- Center for Comprehensive and Community Medicine school of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849- 8501, Japan.
| | - Etsuo Horikawa
- Center for Comprehensive and Community Medicine school of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849- 8501, Japan.
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Hussain S, Mansouri S, Sjöholm Å, Patrone C, Darsalia V. Evidence for cortical neuronal loss in male type 2 diabetic Goto-Kakizaki rats. J Alzheimers Dis 2015; 41:551-60. [PMID: 24643136 DOI: 10.3233/jad-131958] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Type 2 diabetes (T2D) is strongly associated with early cognitive decline and may facilitate the development of neurodegenerative diseases. Despite the overwhelming amount of indirect evidence pointing toward the presence of cerebral neurodegeneration in T2D, no hard proof of it on histological and quantitative levels exists. This warrants more research to investigate whether T2D can lead to neurodegeneration in the central nervous system and to study the precise nature and temporal dynamics of such changes. We performed a comprehensive quantitative assessment of T2D-induced changes in neuronal and glial numbers in the cerebral cortex using stereological methods. We compared the cellular composition of 3- and 13-month-old male type 2 diabetic Goto-Kakizaki (GK) rat brains. Age and sex-matched Wistar rats served as healthy controls. Our results show a significant decrease in neuron numbers (≈11%) in the cerebral cortex of 13-month-old GK rats compared to young, or Wistar rats, while astroglia numbers were unchanged. We also recorded increased microglia activation in aged diabetic rat brains as indicated by significantly increased average microglia cell volume. Our observations provide quantitative evidence of T2D-induced changes in brain's cellular composition during aging. These findings may facilitate the mechanistic understanding of cognitive dysfunction and other neurodegenerative disorders in T2D.
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Affiliation(s)
- Shafaat Hussain
- Department of Clinical Science and Education, Internal Medicine, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
| | - Shiva Mansouri
- Department of Clinical Science and Education, Internal Medicine, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
| | - Åke Sjöholm
- Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama, Mobile, AL, USA Department of Internal Medicine, Diabetes Research Unit, Södertälje Hospital, Södertälje, Sweden
| | - Cesare Patrone
- Department of Clinical Science and Education, Internal Medicine, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
| | - Vladimer Darsalia
- Department of Clinical Science and Education, Internal Medicine, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
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