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Ciarelli J, Thangaraj SV, Sun H, Domke S, Alkhatib B, Vyas AK, Gregg B, Sargis RM, Padmanabhan V. Developmental programming: An exploratory analysis of pancreatic islet compromise in female sheep resulting from gestational BPA exposure. Mol Cell Endocrinol 2024; 588:112202. [PMID: 38552943 DOI: 10.1016/j.mce.2024.112202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 04/11/2024]
Abstract
Developmental exposure to endocrine disruptors like bisphenol A (BPA) are implicated in later-life metabolic dysfunction. Leveraging a unique sheep model of developmental programming, we conducted an exploratory analysis of the programming effects of BPA on the endocrine pancreas. Pregnant ewes were administered environmentally relevant doses of BPA during gestational days (GD) 30-90, and pancreata from female fetuses and adult offspring were analyzed. Prenatal BPA exposure induced a trend toward decreased islet insulin staining and β-cell count, increased glucagon staining and α-cell count, and increased α-cell/β-cell ratio. Findings were most consistent in fetal pancreata assessed at GD90 and in adult offspring exposed to the lowest BPA dose. While not assessed in fetuses, adult islet fibrosis was increased. Collectively, these data provide further evidence that early-life BPA exposure is a likely threat to human metabolic health. Future studies should corroborate these findings and decipher the molecular mechanisms of BPA's developmental endocrine toxicity.
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Affiliation(s)
- Joseph Ciarelli
- Department of Pediatrics, University of Michigan, Ann Arbor, MI, USA
| | | | - Haijing Sun
- Department of Epidemiology, University of Michigan, Ann Arbor, MI, USA
| | - Stephanie Domke
- Department of Pediatrics, University of Michigan, Ann Arbor, MI, USA
| | - Bashar Alkhatib
- Department of Pediatrics, Washington University, St. Louis, USA
| | | | - Brigid Gregg
- Department of Pediatrics, University of Michigan, Ann Arbor, MI, USA
| | - Robert M Sargis
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA; Department of Medicine, Jesse Brown VA Medical Center, Chicago, IL, USA
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Song J, Wang L, Wang L, Guo X, He Q, Cui C, Hu H, Zang N, Yang M, Yan F, Liang K, Wang C, Liu F, Sun Y, Sun Z, Lai H, Hou X, Chen L. Mesenchymal stromal cells ameliorate mitochondrial dysfunction in α cells and hyperglucagonemia in type 2 diabetes via SIRT1/FoxO3a signaling. Stem Cells Transl Med 2024:szae038. [PMID: 38864709 DOI: 10.1093/stcltm/szae038] [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: 11/21/2023] [Accepted: 04/24/2024] [Indexed: 06/13/2024] Open
Abstract
Dysregulation of α cells results in hyperglycemia and hyperglucagonemia in type 2 diabetes mellitus (T2DM). Mesenchymal stromal cell (MSC)-based therapy increases oxygen consumption of islets and enhances insulin secretion. However, the underlying mechanism for the protective role of MSCs in α-cell mitochondrial dysfunction remains unclear. Here, human umbilical cord MSCs (hucMSCs) were used to treat 2 kinds of T2DM mice and αTC1-6 cells to explore the role of hucMSCs in improving α-cell mitochondrial dysfunction and hyperglucagonemia. Plasma and supernatant glucagon were detected by enzyme-linked immunosorbent assay (ELISA). Mitochondrial function of α cells was assessed by the Seahorse Analyzer. To investigate the underlying mechanisms, Sirtuin 1 (SIRT1), Forkhead box O3a (FoxO3a), glucose transporter type1 (GLUT1), and glucokinase (GCK) were assessed by Western blotting analysis. In vivo, hucMSC infusion improved glucose and insulin tolerance, as well as hyperglycemia and hyperglucagonemia in T2DM mice. Meanwhile, hucMSC intervention rescued the islet structure and decreased α- to β-cell ratio. Glucagon secretion from αTC1-6 cells was consistently inhibited by hucMSCs in vitro. Meanwhile, hucMSC treatment activated intracellular SIRT1/FoxO3a signaling, promoted glucose uptake and activation, alleviated mitochondrial dysfunction, and enhanced ATP production. However, transfection of SIRT1 small interfering RNA (siRNA) or the application of SIRT1 inhibitor EX-527 weakened the therapeutic effects of hucMSCs on mitochondrial function and glucagon secretion. Our observations indicate that hucMSCs mitigate mitochondrial dysfunction and glucagon hypersecretion of α cells in T2DM via SIRT1/FoxO3a signaling, which provides novel evidence demonstrating the potential for hucMSCs in treating T2DM.
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Affiliation(s)
- Jia Song
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Lingshu Wang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Liming Wang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Xinghong Guo
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Qin He
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Chen Cui
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Huiqing Hu
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Nan Zang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Mengmeng Yang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Fei Yan
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Kai Liang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Chuan Wang
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Fuqiang Liu
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Yujing Sun
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Zheng Sun
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
| | - Hong Lai
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine and Health, Jinan 250012, Shandong, People's Republic of China
- Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan 250012, Shandong, People's Republic of China
| | - Xinguo Hou
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine and Health, Jinan 250012, Shandong, People's Republic of China
- Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan 250012, Shandong, People's Republic of China
| | - Li Chen
- Department of Endocrinology and Metabolism, Qilu Hospital of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan 250012, Shandong, People's Republic of China
- Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine and Health, Jinan 250012, Shandong, People's Republic of China
- Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan 250012, Shandong, People's Republic of China
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3
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Wang R, Liu Y, Liang Y, Zhou L, Chen MJ, Liu XB, Tan CL, Chen YH. Regional differences in islet amyloid deposition in the residual pancreas with new-onset diabetes secondary to pancreatic ductal adenocarcinoma. World J Gastrointest Surg 2023; 15:1703-1711. [PMID: 37701698 PMCID: PMC10494581 DOI: 10.4240/wjgs.v15.i8.1703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 05/16/2023] [Accepted: 06/06/2023] [Indexed: 08/25/2023] Open
Abstract
BACKGROUND Islet amyloid deposition and reduced β-cell mass are pathological hallmarks in type 2 diabetes mellitus subjects. To date, the pathological features of the islets in diabetes secondary to pancreatic ductal adenocarcinoma (PDAC) have not been specifically addressed. AIM To provide further insight into the relationship between islet amyloid deposition of the residual pancreas in PDAC patients and to explore whether regional differences (proximal vs distal residual pancreas) are associated with islet amyloid deposition. METHODS We retrospectively collected clinical information and pancreatic tissue removed from tumors of 45 PDAC patients, including 14 patients with normal glucose tolerance (NGT), 16 patients with prediabetes and 15 new-onset diabetes (NOD) patients diagnosed before surgery by an oral glucose tolerance test at West China Hospital from July 2017 to June 2020. Pancreatic volume was calculated by multiplying the estimated area of pancreatic tissue on each image slice by the interval between slices based on abdominal computer tomography scans. Several sections of paraffin-embedded pancreas specimens from both the proximal and/or distal regions remote from the tumor were stained as follows: (1) Hematoxylin and eosin for general histological appearance; (2) hematoxylin and insulin for the determination of fractional β-cell area (immunohistochemistry); and (3) quadruple insulin, glucagon, thioflavin T and DAPI staining for the determination of β-cell area, α-cell area and amyloid deposits. RESULTS Screening for pancreatic histologic features revealed that duct obstruction with islet amyloid deposition, fibrosis and marked acinar atrophy were robust in the distal pancreatic regions but much less robust in the proximal regions, especially in the prediabetes and NOD groups. Consistent with this finding, the remnant pancreatic volume was markedly decreased in the NOD group by nearly one-half compared with that in the NGT group (37.35 ± 12.16 cm3 vs 69.79 ± 18.17 cm3, P < 0.001). As expected, islets that stained positive for amyloid (islet amyloid density) were found in the majority of PDAC cases. The proportion of amyloid/islet area (severity of amyloid deposition) was significantly higher in both prediabetes and NOD patients than in NGT patients (P = 0.002; P < 0.0001, respectively). We further examined the regional differences in islet amyloid deposits. Islet amyloid deposit density was robustly increased by approximately 8-fold in the distal regions compared with that in the proximal regions in the prediabetes and NOD groups (3.98% ± 3.39% vs 0.50% ± 0.72%, P = 0.01; 12.03% vs 1.51%, P = 0.001, respectively). CONCLUSION In conclusion, these findings suggest that robust alterations of the distal pancreas due to tumors can disturb islet function and structure with islet amyloid formation, which may be associated with the pathogenesis of NOD secondary to PDAC.
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Affiliation(s)
- Rui Wang
- Division of Pancreatic Surgery, Department of General Surgery, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Ya Liu
- Department of General Surgery, Chengdu Second People's Hospital, Chengdu 610041, Sichuan Province, China
| | - Yan Liang
- Core Facilities, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Li Zhou
- Core Facilities, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Mao-Jia Chen
- Animal Experimental Center, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Xu-Bao Liu
- Division of Pancreatic Surgery, Department of General Surgery, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Chun-Lu Tan
- Division of Pancreatic Surgery, Department of General Surgery, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Yong-Hua Chen
- Division of Pancreatic Surgery, Department of General Surgery, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
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Kawata S, Kozawa J, Yoneda S, Fujita Y, Kashiwagi-Takayama R, Kimura T, Hosokawa Y, Baden MY, Uno S, Uenaka R, Namai K, Koh Y, Tomimaru Y, Hirata H, Uemura M, Nojima S, Morii E, Eguchi H, Imagawa A, Shimomura I. Inflammatory Cell Infiltration Into Islets Without PD-L1 Expression Is Associated With the Development of Immune Checkpoint Inhibitor-Related Type 1 Diabetes in Genetically Susceptible Patients. Diabetes 2023; 72:511-519. [PMID: 36657987 PMCID: PMC10033247 DOI: 10.2337/db22-0557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 01/10/2023] [Indexed: 01/21/2023]
Abstract
Immune checkpoint inhibitors (ICIs) could cause type 1 diabetes (T1D). However, the underlying mechanism remains unclear. We immunohistochemically analyzed pancreatic specimens from three individuals with ICI-related T1D, and their histopathological data were compared those from three patients who had received ICI therapy but did not develop T1D (non-T1D) and seven normal glucose-tolerant subjects as control subjects. All ICI-related T1D patients had susceptible HLA haplotypes. In ICI-related T1D, the β-cell area decreased and the α-cell area increased compared with non-T1D and control subjects. The number of CD3-positive cells around islets increased in ICI-related T1D and non-T1D compared with control subjects, while the number of CD68-positive cells around islets increased in ICI-related T1D compared with non-T1D and control subjects. The expression ratios of programmed death-ligand 1 (PD-L1) on islets decreased in non-T1D and almost completely disappeared in ICI-related T1D, while PD-L1 expression was observed in most cells of pancreatic islets in control subjects. This study, therefore, indicates that ICI therapy itself could reduce PD-L1 expression on islets in all subjects, which may be related to β-cell vulnerability. In addition, we showed that absence of PD-L1 expression on β-cells, genetic susceptibility, and infiltration of macrophages as well as T lymphocytes around islets might be responsible for T1D onset.
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Affiliation(s)
- Satoshi Kawata
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Junji Kozawa
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
- Department of Diabetes Care Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
- Corresponding author: Junji Kozawa,
| | - Sho Yoneda
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
- Yoneda Clinic, Osaka, Japan
| | - Yukari Fujita
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
- Department of Community Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Risa Kashiwagi-Takayama
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Takekazu Kimura
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yoshiya Hosokawa
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Megu Y. Baden
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
- Department of Lifestyle Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Sae Uno
- Division of Endocrinology and Metabolism, Otemae Hospital, Osaka, Japan
| | - Rikako Uenaka
- Division of Endocrinology and Metabolism, Otemae Hospital, Osaka, Japan
| | - Kazuyuki Namai
- Department of Diabetes & Endocrinology, Saitama Red Cross Hospital, Saitama, Japan
| | - Yoko Koh
- Department of Urology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yoshito Tomimaru
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Haruhiko Hirata
- Department of Respiratory Medicine and Clinical Immunology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Motohide Uemura
- Department of Urology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Satoshi Nojima
- Department of Pathology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Eiichi Morii
- Department of Pathology, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Hidetoshi Eguchi
- Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Akihisa Imagawa
- Department of Internal Medicine (I), Faculty of Medicine, Osaka Medical and Pharmaceutical University, Takatsuki, Japan
| | - Iichiro Shimomura
- Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
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5
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Hædersdal S, Andersen A, Knop FK, Vilsbøll T. Revisiting the role of glucagon in health, diabetes mellitus and other metabolic diseases. Nat Rev Endocrinol 2023; 19:321-335. [PMID: 36932176 DOI: 10.1038/s41574-023-00817-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/17/2023] [Indexed: 03/19/2023]
Abstract
Insulin and glucagon exert opposing effects on glucose metabolism and, consequently, pancreatic islet β-cells and α-cells are considered functional antagonists. The intra-islet hypothesis has previously dominated the understanding of glucagon secretion, stating that insulin acts to inhibit the release of glucagon. By contrast, glucagon is a potent stimulator of insulin secretion and has been used to test β-cell function. Over the past decade, α-cells have received increasing attention due to their ability to stimulate insulin secretion from neighbouring β-cells, and α-cell-β-cell crosstalk has proven central for glucose homeostasis in vivo. Glucagon is not only the counter-regulatory hormone to insulin in glucose metabolism but also glucagon secretion is more susceptible to changes in the plasma concentration of certain amino acids than to changes in plasma concentrations of glucose. Thus, the actions of glucagon also include a central role in amino acid turnover and hepatic fat oxidation. This Review provides insights into glucagon secretion, with a focus on the local paracrine actions on glucagon and the importance of α-cell-β-cell crosstalk. We focus on dysregulated glucagon secretion in obesity, non-alcoholic fatty liver disease and type 2 diabetes mellitus. Lastly, the future potential of targeting hyperglucagonaemia and applying dual and triple receptor agonists with glucagon receptor-activating properties in combination with incretin hormone receptor agonism is discussed.
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Affiliation(s)
- Sofie Hædersdal
- Clinical Research, Copenhagen University Hospital - Steno Diabetes Center Copenhagen, Herlev, Denmark.
- Center for Clinical Metabolic Research, Copenhagen University Hospital - Herlev and Gentofte, Hellerup, Denmark.
| | - Andreas Andersen
- Clinical Research, Copenhagen University Hospital - Steno Diabetes Center Copenhagen, Herlev, Denmark
- Center for Clinical Metabolic Research, Copenhagen University Hospital - Herlev and Gentofte, Hellerup, Denmark
| | - Filip K Knop
- Clinical Research, Copenhagen University Hospital - Steno Diabetes Center Copenhagen, Herlev, Denmark
- Center for Clinical Metabolic Research, Copenhagen University Hospital - Herlev and Gentofte, Hellerup, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, Denmark
| | - Tina Vilsbøll
- Clinical Research, Copenhagen University Hospital - Steno Diabetes Center Copenhagen, Herlev, Denmark.
- Center for Clinical Metabolic Research, Copenhagen University Hospital - Herlev and Gentofte, Hellerup, Denmark.
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
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Ozawa H, Fukui K, Fujita Y, Ishibashi C, Yoneda S, Nammo T, Fujita S, Baden MY, Kimura T, Tokunaga A, Kozawa J, Eguchi H, Shimomura I. Expansion of human alpha-cell area is associated with a higher maximum body mass index before the onset of type 2 diabetes. J Diabetes 2023; 15:277-282. [PMID: 36843206 PMCID: PMC10036255 DOI: 10.1111/1753-0407.13370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 01/20/2023] [Accepted: 02/03/2023] [Indexed: 02/28/2023] Open
Abstract
Highlights: We examined whether maximum body mass index (BMI) before the onset of diabetes (MBBO) affects histological findings of islet cells. We divided patients into two groups according to an MBBO cutoff of 25 kg/m2 or BMI cutoff of 21 kg/m2. We compared immunohistochemical parameters between the MBBO groups or BMI groups. The relative alpha‐cell area in the high MBBO group was significantly higher than that in the low MBBO group. There was no difference in the other parameters between the MBBO groups or BMI groups.
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Affiliation(s)
- Harutoshi Ozawa
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Kenji Fukui
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Yukari Fujita
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
- Department of Community Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Chisaki Ishibashi
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Sho Yoneda
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
- Yoneda ClinicOsakaJapan
| | - Takao Nammo
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
- Department of Diabetes Care Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Shingo Fujita
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Megu Yamaguchi Baden
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Takekazu Kimura
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Ayumi Tokunaga
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Junji Kozawa
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
- Department of Diabetes Care Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Hidetoshi Eguchi
- Department of Gastroenterological Surgery, Graduate School of MedicineOsaka UniversitySuitaJapan
| | - Iichiro Shimomura
- Department of Metabolic Medicine, Graduate School of MedicineOsaka UniversitySuitaJapan
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7
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Song J, He Q, Guo X, Wang L, Wang J, Cui C, Hu H, Yang M, Cui Y, Zang N, Yan F, Liu F, Sun Y, Liang K, Qin J, Zhao R, Wang C, Sun Z, Hou X, Li W, Chen L. Mesenchymal stem cell-conditioned medium alleviates high fat-induced hyperglucagonemia via miR-181a-5p and its target PTEN/AKT signaling. Mol Cell Endocrinol 2021; 537:111445. [PMID: 34464683 DOI: 10.1016/j.mce.2021.111445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 08/08/2021] [Accepted: 08/25/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND α-cell dysregulation gives rise to fasting and postprandial hyperglycemia in type 2 diabetes mellitus(T2DM). Administration of Mesenchymal stem cells (MSCs) or their conditioned medium can improve islet function and enhance insulin secretion. However, studies showing the direct effect of MSCs on islet α-cell dysfunction are limited. METHODS In this study, we used high-fat diet (HFD)-induced mice and α-cell line exposure to palmitate (PA) to determine the effects of bone marrow-derived MSC-conditioned medium (bmMSC-CM) on glucagon secretion. Plasma and supernatant glucagon were detected by enzyme-linked immunosorbent assay(ELISA). To investigate the potential signaling pathways, phosphatase and tensin homolog deleted on chromosome 10 (PTEN), AKT and phosphorylated AKT(p-AKT) were assessed by Western blotting. RESULTS In vivo, bmMSC-CM infusion improved the glucose and insulin tolerance and protected against HFD-induced hyperglycemia and hyperglucagonemia. Meanwhile, bmMSC-CM infusion ameliorated HFD-induced islet hypertrophy and decreased α- and β-cell area. Consistently, in vitro, glucagon secretion from α-cells or primary islets was inhibited by bmMSC-CM, accompanied by reduction of intracellular PTEN expression and restoration of AKT signaling. Previous studies and the TargetScan database indicate that miR-181a and its target PTEN play vital roles in ameliorating α-cell dysfunction. We observed that miR-181a-5p was highly expressed in BM-MSCs but prominently lower in αTC1-6 cells. Overexpression or downregulation of miR-181a-5p respectively alleviated or aggravated glucagon secretion in αTC1-6 cells via the PTEN/AKT signaling pathway. CONCLUSIONS Our observations suggest that MSC-derived miR-181a-5p mitigates glucagon secretion of α-cells by regulating PTEN/AKT signaling, which provides novel evidence demonstrating the potential for MSCs in treating T2DM.
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Affiliation(s)
- Jia Song
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Qin He
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Xinghong Guo
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Lingshu Wang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Jinbang Wang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Chen Cui
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Huiqing Hu
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Mengmeng Yang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Yixin Cui
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Nan Zang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Fei Yan
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Fuqiang Liu
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Yujing Sun
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Kai Liang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Jun Qin
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Ruxing Zhao
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Chuan Wang
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Zheng Sun
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Xinguo Hou
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China; Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, 250012, Shandong, China; Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, Jinan, 250012, Shandong, China; Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan, 250012, Shandong, China
| | - Wenjuan Li
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China; Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, 250012, Shandong, China; Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, Jinan, 250012, Shandong, China; Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan, 250012, Shandong, China.
| | - Li Chen
- Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, 250012, Shandong, China; Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, 250012, Shandong, China; Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, Jinan, 250012, Shandong, China; Jinan Clinical Research Center for Endocrine and Metabolic Disease, Jinan, 250012, Shandong, China.
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8
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Buckels EJ, Bloomfield FH, Oliver MH, Spiroski AM, Harding JE, Jaquiery AL. Sexually dimorphic changes in the endocrine pancreas and skeletal muscle in young adulthood following intra-amniotic IGF-I treatment of growth-restricted fetal sheep. Am J Physiol Endocrinol Metab 2021; 321:E530-E542. [PMID: 34459219 DOI: 10.1152/ajpendo.00111.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Fetal growth restriction (FGR) is associated with decreased insulin secretory capacity and decreased insulin sensitivity in muscle in adulthood. We investigated whether intra-amniotic IGF-I treatment in late gestation mitigated the adverse effects of FGR on the endocrine pancreas and skeletal muscle at 18 mo of age. Singleton-bearing ewes underwent uterine artery embolization between 103 and 107 days of gestational age, followed by 5 once-weekly intra-amniotic injections of 360-µg IGF-I (FGRI) or saline (FGRS) and were compared with an unmanipulated control group (CON). We measured offspring pancreatic endocrine cell mass and pancreatic and skeletal muscle mRNA expression at 18 mo of age (n = 7-9/sex/group). Total α-cell mass was increased ∼225% in FGRI males versus CON and FGRS males, whereas β-cell mass was not different between groups of either sex. Pancreatic mitochondria-related mRNA expression was increased in FGRS females versus CON (NRF1, MTATP6, UCP2), and FGRS males versus CON (TFAM, NRF1, UCP2) but was largely unchanged in FGRI males versus CON. In skeletal muscle, mitochondria-related mRNA expression was decreased in FGRS females versus CON (PPARGC1A, TFAM, NRF1, UCP2, MTATP6), FGRS males versus CON (NRF1 and UCP2), and FGRI females versus CON (TFAM and UCP2), with only MTATP6 expression decreased in FGRI males versus CON. Although the window during which IGF-I treatment was delivered was limited to the final 5 wk of gestation, IGF-I therapy of FGR altered the endocrine pancreas and skeletal muscle in a sex-specific manner in young adulthood.NEW & NOTEWORTHY Fetal growth restriction (FGR) is associated with compromised metabolic function throughout adulthood. Here, we explored the long-term effects of fetal IGF-I therapy on the adult pancreas and skeletal muscle. This is the first study demonstrating that IGF-I therapy of FGR has sex-specific long-term effects at both the tissue and molecular level on metabolically active tissues in adult sheep.
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Affiliation(s)
- Emma J Buckels
- The Liggins Institute, University of Auckland, Auckland, New Zealand
| | | | - Mark H Oliver
- The Liggins Institute, University of Auckland, Auckland, New Zealand
| | | | - Jane E Harding
- The Liggins Institute, University of Auckland, Auckland, New Zealand
| | - Anne L Jaquiery
- The Liggins Institute, University of Auckland, Auckland, New Zealand
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9
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Sasaki H, Saisho Y, Inaishi J, Itoh H. Revisiting Regulators of Human β-cell Mass to Achieve β-cell-centric Approach Toward Type 2 Diabetes. J Endocr Soc 2021; 5:bvab128. [PMID: 34405128 PMCID: PMC8361804 DOI: 10.1210/jendso/bvab128] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Indexed: 02/07/2023] Open
Abstract
Type 2 diabetes (T2DM) is characterized by insulin resistance and β-cell dysfunction. Because patients with T2DM have inadequate β-cell mass (BCM) and β-cell dysfunction worsens glycemic control and makes treatment difficult, therapeutic strategies to preserve and restore BCM are needed. In rodent models, obesity increases BCM about 3-fold, but the increase in BCM in humans is limited. Besides, obesity-induced changes in BCM may show racial differences between East Asians and Caucasians. Recently, the developmental origins of health and disease hypothesis, which states that the risk of developing noncommunicable diseases including T2DM is influenced by the fetal environment, has been proposed. It is known in rodents that animals with low birthweight have reduced BCM through epigenetic modifications, making them more susceptible to diabetes in the future. Similarly, in humans, we revealed that individuals born with low birthweight have lower BCM in adulthood. Because β-cell replication is more frequently observed in the 5 years after birth, and β cells are found to be more plastic in that period, a history of childhood obesity increases BCM. BCM in patients with T2DM is reduced by 20% to 65% compared with that in individuals without T2DM. However, since BCM starts to decrease from the stage of borderline diabetes, early intervention is essential for β-cell protection. In this review, we summarize the current knowledge on regulatory factors of human BCM in health and diabetes and propose the β-cell–centric concept of diabetes to enhance a more pathophysiology-based treatment approach for T2DM.
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Affiliation(s)
- Hironobu Sasaki
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan.,Center for Preventive Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Yoshifumi Saisho
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Jun Inaishi
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan.,Center for Preventive Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Hiroshi Itoh
- Division of Nephrology, Endocrinology and Metabolism, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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10
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Fujita Y, Kozawa J, Fukui K, Iwahashi H, Eguchi H, Shimomura I. Increased NKX6.1 expression and decreased ARX expression in alpha cells accompany reduced beta-cell volume in human subjects. Sci Rep 2021; 11:17796. [PMID: 34493754 PMCID: PMC8423790 DOI: 10.1038/s41598-021-97235-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/23/2021] [Indexed: 11/19/2022] Open
Abstract
Pancreatic islet cells have plasticity, such as the abilities to dedifferentiate and transdifferentiate. Islet cell conversion to other characteristic cell is largely determined by transcription factors, but significance of expression patterns of these transcription factors in human islet cells remained unclear. Here, we present the NKX6.1-positive ratio of glucagon-positive cells (NKX6.1+/GCG+ ratio) and the ARX-negative ratio of glucagon-positive cells (ARX−/GCG+ ratio) in 34 patients who were not administered antidiabetic agents. Both of NKX6.1+/GCG+ ratio and ARX−/GCG+ ratio negatively associated with relative beta cell area. And these ratios did not have significant correlation with other parameters including age, body mass index, hemoglobin A1c, fasting plasma glucose level or relative alpha-cell area. Our data demonstrate that these expression ratios of transcription factors in glucagon-positive cells closely correlate with the reduction of beta-cell volume in human pancreas.
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Affiliation(s)
- Yukari Fujita
- Departments of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2-B5 Yamadaoka, Suita, 565-0871, Japan. .,Community Medicine, Graduate School of Medicine, Osaka University, Suita, Japan.
| | - Junji Kozawa
- Departments of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2-B5 Yamadaoka, Suita, 565-0871, Japan.,Diabetes Care Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Kenji Fukui
- Departments of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2-B5 Yamadaoka, Suita, 565-0871, Japan
| | - Hiromi Iwahashi
- Departments of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2-B5 Yamadaoka, Suita, 565-0871, Japan.,Diabetes Care Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Hidetoshi Eguchi
- Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Iichiro Shimomura
- Departments of Metabolic Medicine, Graduate School of Medicine, Osaka University, 2-2-B5 Yamadaoka, Suita, 565-0871, Japan
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11
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Martínez MS, Manzano A, Olivar LC, Nava M, Salazar J, D’Marco L, Ortiz R, Chacín M, Guerrero-Wyss M, Cabrera de Bravo M, Cano C, Bermúdez V, Angarita L. The Role of the α Cell in the Pathogenesis of Diabetes: A World beyond the Mirror. Int J Mol Sci 2021; 22:9504. [PMID: 34502413 PMCID: PMC8431704 DOI: 10.3390/ijms22179504] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 08/26/2021] [Accepted: 08/26/2021] [Indexed: 12/11/2022] Open
Abstract
Type 2 Diabetes Mellitus (T2DM) is one of the most prevalent chronic metabolic disorders, and insulin has been placed at the epicentre of its pathophysiological basis. However, the involvement of impaired alpha (α) cell function has been recognized as playing an essential role in several diseases, since hyperglucagonemia has been evidenced in both Type 1 and T2DM. This phenomenon has been attributed to intra-islet defects, like modifications in pancreatic α cell mass or dysfunction in glucagon's secretion. Emerging evidence has shown that chronic hyperglycaemia provokes changes in the Langerhans' islets cytoarchitecture, including α cell hyperplasia, pancreatic beta (β) cell dedifferentiation into glucagon-positive producing cells, and loss of paracrine and endocrine regulation due to β cell mass loss. Other abnormalities like α cell insulin resistance, sensor machinery dysfunction, or paradoxical ATP-sensitive potassium channels (KATP) opening have also been linked to glucagon hypersecretion. Recent clinical trials in phases 1 or 2 have shown new molecules with glucagon-antagonist properties with considerable effectiveness and acceptable safety profiles. Glucagon-like peptide-1 (GLP-1) agonists and Dipeptidyl Peptidase-4 inhibitors (DPP-4 inhibitors) have been shown to decrease glucagon secretion in T2DM, and their possible therapeutic role in T1DM means they are attractive as an insulin-adjuvant therapy.
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Affiliation(s)
- María Sofía Martínez
- MedStar Health Internal Medicine, Georgetown University Affiliated, Baltimore, MD 21218-2829, USA;
| | - Alexander Manzano
- Endocrine and Metabolic Diseases Research Center, School of Medicine, Universidad del Zulia, Maracaibo 4002, Venezuela; (A.M.); (L.C.O.); (M.N.); (J.S.); (C.C.)
| | - Luis Carlos Olivar
- Endocrine and Metabolic Diseases Research Center, School of Medicine, Universidad del Zulia, Maracaibo 4002, Venezuela; (A.M.); (L.C.O.); (M.N.); (J.S.); (C.C.)
| | - Manuel Nava
- Endocrine and Metabolic Diseases Research Center, School of Medicine, Universidad del Zulia, Maracaibo 4002, Venezuela; (A.M.); (L.C.O.); (M.N.); (J.S.); (C.C.)
| | - Juan Salazar
- Endocrine and Metabolic Diseases Research Center, School of Medicine, Universidad del Zulia, Maracaibo 4002, Venezuela; (A.M.); (L.C.O.); (M.N.); (J.S.); (C.C.)
| | - Luis D’Marco
- Department of Nephrology, Hospital Clinico Universitario de Valencia, INCLIVA, University of Valencia, 46010 Valencia, Spain;
| | - Rina Ortiz
- Facultad de Medicina, Universidad Católica de Cuenca, Ciudad de Cuenca, Azuay 010105, Ecuador;
| | - Maricarmen Chacín
- Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla 080022, Colombia; (M.C.); (V.B.)
| | - Marion Guerrero-Wyss
- Escuela de Nutrición y Dietética, Facultad de Ciencias Para el Cuidado de la Salud, Universidad San Sebastián, Valdivia 5090000, Chile;
| | | | - Clímaco Cano
- Endocrine and Metabolic Diseases Research Center, School of Medicine, Universidad del Zulia, Maracaibo 4002, Venezuela; (A.M.); (L.C.O.); (M.N.); (J.S.); (C.C.)
| | - Valmore Bermúdez
- Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla 080022, Colombia; (M.C.); (V.B.)
| | - Lisse Angarita
- Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad Andres Bello, Sede Concepción 4260000, Chile
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12
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Hamasaki H, Morimitsu S. Association of Glucagon With Obesity, Glycemic Control and Renal Function in Adults With Type 2 Diabetes Mellitus. Can J Diabetes 2020; 45:249-254. [PMID: 33129755 DOI: 10.1016/j.jcjd.2020.08.108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/24/2020] [Accepted: 08/28/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVES In this study, we used a double-antibody sandwich enzyme-linked immunosorbent assay to assess the association between blood glucagon levels and indices of obesity, glycemic control and renal function in patients with type 2 diabetes mellitus (T2DM). METHODS This investigation was a cross-sectional study on inpatients with T2DM who had plasma glucagon levels measured during hospitalization. Associations of fasting glucagon levels (G0), 120-minute postbreakfast plasma glucagon (G120), fasting glucagon/C-peptide ratio (G0/CPR0) and postbreakfast glucagon/C-peptide ratio (G120/CPR120) with clinical data were evaluated using multiple regression analysis. RESULTS A total of 345 patients were enrolled in the study. G0, and G120 were significantly and positively associated with serum C-peptide levels. Moreover, G0 and G120 were positively associated with waist circumference, and G0 was negatively associated with duration of diabetes mellitus. Interestingly, both G0 and G120 were negatively associated with the estimated glomerular filtration rate. In addition, G120/CPR120 was positively associated with duration of diabetes mellitus and glycoalbumin levels. CONCLUSIONS The balance between glucagon and insulin secretion is significantly associated with abdominal obesity and important for maintaining glucose homeostasis. Postprandial hyperglucagonemia could also be related to deterioration of renal function.
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Affiliation(s)
- Hidetaka Hamasaki
- Hamasaki Clinic, Kagoshima, Japan; Department of Diabetes, Imakiire General Hospital, Kagoshima, Japan.
| | - Shingo Morimitsu
- Department of Diabetes, Imakiire General Hospital, Kagoshima, Japan
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13
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Watada H. Clinical evidence regarding factors linking metabolic abnormal obesity to pancreatic β-cell dysfunction. J Diabetes Investig 2020; 11:798-800. [PMID: 32248633 PMCID: PMC7378415 DOI: 10.1111/jdi.13264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 03/26/2020] [Accepted: 03/26/2020] [Indexed: 12/13/2022] Open
Affiliation(s)
- Hirotaka Watada
- Department of Metabolism and EndocrinologyJuntendo University Graduate School of MedicineTokyoJapan
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14
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Abstract
OBJECTIVES The present study aimed to investigate the dynamic change of α cells and β cells, and their ratios in prediabetes and type 2 diabetes in the Chinese population. METHODS Pancreata from 27 nondiabetic (ND), 8 prediabetic (PreD), and 19 type 2 diabetic (T2D) organ donors were subjected to immunofluorescence staining with insulin and glucagon. RESULTS The β to α ratio in islets (β/α) in PreD was significantly higher than that in ND, resulting from an increase of β cells and a decrease of α cells per islet, but that in T2D was significantly lower than that in ND, resulting from a decrease of β cells and an increase of α cells per islet. The β-cell percentage and β/α ratio positively correlated and α-cell percentage negatively correlated with HbA1c (glycated hemoglobin) in ND and PreD, but these correlations disappeared when T2D subjects were included. CONCLUSIONS The islet β to α ratio increased in PreD individuals because of a relative α-cell loss and β-cell compensation and decreased after T2D onset because of both β-cell loss and α-cell reexpansion.
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15
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Abstract
Glucagon and its partner insulin are dually linked in both their secretion from islet cells and their action in the liver. Glucagon signaling increases hepatic glucose output, and hyperglucagonemia is partly responsible for the hyperglycemia in diabetes, making glucagon an attractive target for therapeutic intervention. Interrupting glucagon signaling lowers blood glucose but also results in hyperglucagonemia and α-cell hyperplasia. Investigation of the mechanism for α-cell proliferation led to the description of a conserved liver-α-cell axis where glucagon is a critical regulator of amino acid homeostasis. In return, amino acids regulate α-cell function and proliferation. New evidence suggests that dysfunction of the axis in humans may result in the hyperglucagonemia observed in diabetes. This discussion outlines important but often overlooked roles for glucagon that extend beyond glycemia and supports a new role for α-cells as amino acid sensors.
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Affiliation(s)
- E Danielle Dean
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University Medical Center, and Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
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16
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Finan B, Capozzi ME, Campbell JE. Repositioning Glucagon Action in the Physiology and Pharmacology of Diabetes. Diabetes 2020; 69:532-541. [PMID: 31178432 PMCID: PMC7085250 DOI: 10.2337/dbi19-0004] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 05/30/2019] [Indexed: 01/03/2023]
Abstract
Glucagon is historically described as the counterregulatory hormone to insulin, induced by fasting/hypoglycemia to raise blood glucose through action mediated in the liver. However, it is becoming clear that the biology of glucagon is much more complex and extends beyond hepatic actions to exert control on glucose metabolism. We discuss the inconsistencies with the canonical view that glucagon is primarily a hyperglycemic agent driven by fasting/hypoglycemia and highlight the recent advances that have reshaped the metabolic role of glucagon. These concepts are placed within the context of both normal physiology and the pathophysiology of disease and then extended to discuss emerging strategies that incorporate glucagon agonism in the pharmacology of treating diabetes.
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Affiliation(s)
- Brian Finan
- Novo Nordisk Research Center, Indianapolis, IN
| | - Megan E Capozzi
- Duke Molecular Physiology Institute, Duke University, Durham, NC
| | - Jonathan E Campbell
- Duke Molecular Physiology Institute, Duke University, Durham, NC
- Division of Endocrinology, Department of Medicine, Duke University, Durham, NC
- Department of Pharmacology and Cancer Biology, Duke University, Durham, NC
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17
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Bru-Tari E, Oropeza D, Herrera PL. Cell Heterogeneity and Paracrine Interactions in Human Islet Function: A Perspective Focused in β-Cell Regeneration Strategies. Front Endocrinol (Lausanne) 2020; 11:619150. [PMID: 33613453 PMCID: PMC7888438 DOI: 10.3389/fendo.2020.619150] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/14/2020] [Indexed: 12/27/2022] Open
Abstract
The β-cell regeneration field has shown a strong knowledge boost in the last 10 years. Pluripotent stem cell differentiation and direct reprogramming from other adult cell types are becoming more tangible long-term diabetes therapies. Newly generated β-like-cells consistently show hallmarks of native β-cells and can restore normoglycemia in diabetic mice in virtually all recent studies. Nonetheless, these cells still show important compromises in insulin secretion, cell metabolism, electrical activity, and overall survival, perhaps due to a lack of signal integration from other islet cells. Mounting data suggest that diabetes is not only a β-cell disease, as the other islet cell types also contribute to its physiopathology. Here, we present an update on the most recent studies of islet cell heterogeneity and paracrine interactions in the context of restoring an integrated islet function to improve β-cell replacement therapies.
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18
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Lenz A, Lenz G, Ku HT, Ferreri K, Kandeel F. Islets from human donors with higher but not lower hemoglobin A1c levels respond to gastrin treatment in vitro. PLoS One 2019; 14:e0221456. [PMID: 31430329 PMCID: PMC6701795 DOI: 10.1371/journal.pone.0221456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 08/08/2019] [Indexed: 12/12/2022] Open
Abstract
Gastrin is a peptide hormone, which in combination with other factors such as TGFα, EGF or GLP-1, is capable of increasing beta cell mass and lowering blood glucose levels in adult diabetic mice. In humans, administration of a bolus of gastrin alone induces insulin secretion suggesting that gastrin may target islet cells. However, whether gastrin alone is sufficient to exert an effect on isolated human islets has been controversial and the mechanism remained poorly understood. Therefore, in this study we started to examine the effects of gastrin alone on cultured adult human islets. Treatment of isolated human islets with gastrin I for 48 h resulted in increased expression of insulin, glucagon and somatostatin transcripts. These increases were significantly correlated with the levels of donor hemoglobin A1c (HbA1c) but not BMI or age. In addition, gastrin treatment resulted in increased expression of PDX1, NKX6.1, NKX2.2, MNX1 and HHEX in islets from donors with HbA1c greater than 42 mmol/mol. The addition of YM022, an antagonist of the gastrin receptor cholecystokinin B receptor (CCKBR), together with gastrin eliminated these effects, verifying that the effects of gastrin are mediated through CCKBR.CCKBR is expressed in somatostatin-expressing delta cells in islets from all donors. However, in the islets from donors with higher HbA1c (greater than 42 mmol/mol [6.0%]), cells triple-positive for CCKBR, somatostatin and insulin were detected, suggesting a de-differentiation or trans-differentiation of endocrine cells. Our results demonstrate a direct effect of gastrin on human islets from prediabetic or diabetic individuals that is mediated through CCKBR+ cells. Further, our data imply that gastrin may be a potential treatment for diabetic patients.
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Affiliation(s)
- Ayelet Lenz
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, California, United States of America
- * E-mail:
| | - Gal Lenz
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Hsun Teresa Ku
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Kevin Ferreri
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, California, United States of America
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19
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Roncero-Ramos I, Jimenez-Lucena R, Alcala-Diaz JF, Vals-Delgado C, Arenas-Larriva AP, Rangel-Zuñiga OA, Leon-Acuña A, Malagon MM, Delgado-Lista J, Perez-Martinez P, Ordovas JM, Camargo A, Lopez-Miranda J. Alpha cell function interacts with diet to modulate prediabetes and Type 2 diabetes. J Nutr Biochem 2018; 62:247-256. [DOI: 10.1016/j.jnutbio.2018.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 08/22/2018] [Accepted: 08/24/2018] [Indexed: 12/19/2022]
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