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Borges DO, Patarrão RS, Ribeiro RT, de Oliveira RM, Duarte N, Belew GD, Martins M, Andrade R, Costa J, Correia I, Boavida JM, Duarte R, Gardete-Correia L, Medina JL, Raposo JF, Jones JG, Penha-Gonçalves C, Macedo MP. Loss of postprandial insulin clearance control by Insulin-degrading enzyme drives dysmetabolism traits. Metabolism 2021; 118:154735. [PMID: 33631143 DOI: 10.1016/j.metabol.2021.154735] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 02/10/2021] [Accepted: 02/15/2021] [Indexed: 02/05/2023]
Abstract
Systemic insulin availability is determined by a balance between beta-cell secretion capacity and insulin clearance (IC). Insulin-degrading enzyme (IDE) is involved in the intracellular mechanisms underlying IC. The liver is a major player in IC control yet the role of hepatic IDE in glucose and lipid homeostasis remains unexplored. We hypothesized that IDE governs postprandial IC and hepatic IDE dysfunction amplifies dysmetabolic responses and prediabetes traits such as hepatic steatosis. In a European/Portuguese population-based cohort, IDE SNPs were strongly associated with postprandial IC in normoglycemic men but to a considerably lesser extent in women or in subjects with prediabetes. Liver-specific knockout-mice (LS-IDE KO) under normal chow diet (NCD), showed reduced postprandial IC with glucose intolerance and under high fat diet (HFD) were more susceptible to hepatic steatosis than control mice. This suggests that regulation of IC by IDE contributes to liver metabolic resilience. In agreement, LS-IDE KO hepatocytes revealed reduction of Glut2 expression levels with consequent impairment of glucose uptake and upregulation of CD36, a major hepatic free fatty acid transporter. Together these findings provide strong evidence that dysfunctional IC due to abnormal IDE regulation directly impairs postprandial hepatic glucose disposal and increases susceptibility to dysmetabolic conditions in the setting of Western diet/lifestyle.
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Affiliation(s)
- Diego O Borges
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Molecular Biosciences PhD Program, Instituto de Tecnologia Química e Biológica António Xavier - ITQB NOVA, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Rita S Patarrão
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Rogério T Ribeiro
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Departamento de Ciências Médicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal
| | - Rita Machado de Oliveira
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal
| | - Nádia Duarte
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | | | | | - Rita Andrade
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - João Costa
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Isabel Correia
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - José Manuel Boavida
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - Rui Duarte
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - Luís Gardete-Correia
- Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | | | - João F Raposo
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - John G Jones
- APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Center for Neurosciences and Cell Biology, University of Coimbra, Portugal
| | - Carlos Penha-Gonçalves
- Instituto Gulbenkian de Ciência, Oeiras, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal
| | - M Paula Macedo
- Centro de Estudos de Doenças Crónicas (CEDOC), NOVA Medical School-FCM, Universidade Nova de Lisboa, Lisboa, Portugal; Sociedade Portuguesa de Diabetologia, Lisboa, Portugal; APDP-Diabetes Portugal Education and Research Center (APDP-ERC), Lisboa, Portugal; Departamento de Ciências Médicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal.
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Leissring MA, González-Casimiro CM, Merino B, Suire CN, Perdomo G. Targeting Insulin-Degrading Enzyme in Insulin Clearance. Int J Mol Sci 2021; 22:ijms22052235. [PMID: 33668109 PMCID: PMC7956289 DOI: 10.3390/ijms22052235] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/20/2021] [Accepted: 02/21/2021] [Indexed: 02/07/2023] Open
Abstract
Hepatic insulin clearance, a physiological process that in response to nutritional cues clears ~50–80% of circulating insulin, is emerging as an important factor in our understanding of the pathogenesis of type 2 diabetes mellitus (T2DM). Insulin-degrading enzyme (IDE) is a highly conserved Zn2+-metalloprotease that degrades insulin and several other intermediate-size peptides. Both, insulin clearance and IDE activity are reduced in diabetic patients, albeit the cause-effect relationship in humans remains unproven. Because historically IDE has been proposed as the main enzyme involved in insulin degradation, efforts in the development of IDE inhibitors as therapeutics in diabetic patients has attracted attention during the last decades. In this review, we retrace the path from Mirsky’s seminal discovery of IDE to the present, highlighting the pros and cons of the development of IDE inhibitors as a pharmacological approach to treating diabetic patients.
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Affiliation(s)
- Malcolm A. Leissring
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine (UCI MIND), Irvine, CA 92697-4545, USA
- Correspondence: (M.A.L.); (G.P.); Tel.: +1-904-254-3050 (M.A.L.); +34-983-184-805 (G.P.)
| | - Carlos M. González-Casimiro
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
| | - Beatriz Merino
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
| | - Caitlin N. Suire
- Department of Biomedical Sciences, Florida State University, Tallahassee, FL 32306-4300, USA;
| | - Germán Perdomo
- Instituto de Biología y Genética Molecular (University of Valladolid-CSIC), 47003 Valladolid, Spain; (C.M.G.-C.); (B.M.)
- Correspondence: (M.A.L.); (G.P.); Tel.: +1-904-254-3050 (M.A.L.); +34-983-184-805 (G.P.)
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3
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Sofer Y, Nash Y, Osher E, Fursht O, Goldsmith G, Nahary L, Shaklai S, Tordjman KM, Serebro M, Touati EB, Yacobi Bach M, Marcus Y, Tal B, Sack J, Shefer G, Margaliot M, Landis N, Goldiner I, Abu Ahmad W, Stern N, Benhar I, Frenkel D. Insulin-degrading enzyme higher in subjects with metabolic syndrome. Endocrine 2021; 71:357-364. [PMID: 33398768 DOI: 10.1007/s12020-020-02548-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 11/05/2020] [Indexed: 10/22/2022]
Abstract
Metabolic syndrome (MS) is comprised of a cluster of abnormalities in glucose, lipid, and vascular homeostasis, which is most commonly linked to abdominal obesity. MS heralds increased risk for development of diabetes and is linked to impairment in insulin signaling. Insulin-degrading enzyme (IDE) is one of the mechanisms through which insulin blood levels are maintained. It has been previously suggested that controlling IDE levels could provide yet another potential therapeutic approach in diabetes. Here we aim to investigate whether changes in serum IDE levels correlate with the severity of MS. Using a highly sensitive ELISA assay of active IDE in human serum, we found a strong correlation between circulating IDE levels and circulating levels of triglycerides, insulin, and c-peptide and an inverse correlation with HDL cholesterol (HDLc). Serum IDE levels were higher in MS subjects than in control subjects. Hence, circulating IDE may serve as a tool to identify subjects with abnormal insulin metabolism, possibly those with MS that are at risk to develop diabetes.
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Affiliation(s)
- Y Sofer
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel.
| | - Y Nash
- Department of Neurobiology, School of Neurobiology, Biochemistry and Biophysics, George S Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - E Osher
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - O Fursht
- Department of Neurobiology, School of Neurobiology, Biochemistry and Biophysics, George S Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - G Goldsmith
- Department of Neurobiology, School of Neurobiology, Biochemistry and Biophysics, George S Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - L Nahary
- Department of Molecular Microbiology and Biotechnology, The Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, Tel Aviv, Israel
| | - S Shaklai
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - K M Tordjman
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - M Serebro
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - E B Touati
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - M Yacobi Bach
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - Y Marcus
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - B Tal
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - J Sack
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - G Shefer
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - M Margaliot
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - N Landis
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - I Goldiner
- Laboratory Medicine, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - W Abu Ahmad
- Hebrew University-Hadassah Braun School of Public Health and Community Medicine, Jerusalem, Israel
| | - N Stern
- Institute of Endocrinology, Metabolism and Hypertension and The Sagol Center for Epigenetics of Metabolism and Aging, Tel Aviv Sourasky Medical Center and Sackler Faculty of Medicine, Tel Aviv, Israel
| | - I Benhar
- Department of Molecular Microbiology and Biotechnology, The Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, Tel Aviv, Israel
| | - D Frenkel
- Department of Neurobiology, School of Neurobiology, Biochemistry and Biophysics, George S Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.
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Jiang J, Chen C, Cheng S, Yuan X, Jin J, Zhang C, Sun X, Song J, Zuo Q, Zhang Y, Chen G, Li B. Long Noncoding RNA LncPGCR Mediated by TCF7L2 Regulates Primordial Germ Cell Formation in Chickens. Animals (Basel) 2021; 11:ani11020292. [PMID: 33498947 PMCID: PMC7912682 DOI: 10.3390/ani11020292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 12/21/2022] Open
Abstract
Simple Summary The potential of primordial germ cells (PGCs) for multidirectional differentiation, together with their unique regeneration ability, makes them one of the most promising seed cells in clinical medicine and tissue engineering research. However, not enough PGCs can be obtained to meet the demand, which limits their application. We defined a novel long noncoding RNA (lncRNA) mediated by epigenetics, which could activate the miR-6577-5p/Btrc pathway to promote the formation of PGCs. The technical system we have established is a useful tool to obtain sufficient PGCs for scientific research. Our study offers great theoretical and practical value in the production of transgenic animals or genomic imprinting in poultry. We believe that our study will help researchers in the fields of agricultural production, developmental biology, and cell biology. Abstract Although lncRNAs have been identified as playing critical roles in the development of germ cells, their potential involvement in the development of PGCs in chickens remains poorly understood. Differentially expressed lncRNAs (DELs) from previous RNA-seq of embryonic stem cells (ESCs), PGCs, and spermatogonial stem cells (SSCs) were analyzed by K-means clustering, from which a key candidate, lncRNA (lncRNA PGC regulator, LncPGCR) was obtained. We confirmed that LncPGCR plays a positive role in the development of PGCs by increasing the expression of the PGC marker gene (Cvh and C-kit), while downregulating the pluripotency-associated gene (Nanog) in vitro and in vivo. The activation and expression of LncPGCR are regulated by histone acetylation, and transcription factor TCF7L2. Mechanistically, a rescue assay was performed to further confirm that LncPGCR contributed to the development of PGCs by regulating the gga-miR-6577-5p/Btrc signaling pathway. Adsorption of gga-miR-6577-5p activated the WNT signaling cascade by relieving the gga-miR-6577-5p-dependent inhibition of Btrc expression. Taken together, our study discovered the growth-expedited role of LncPGCR in PGCs development, showing the potential LncPGCR/miR-6577-5p/Btrc pathway. The results and findings provide a novel insight into the development of PGCs.
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Affiliation(s)
- Jingyi Jiang
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Chen Chen
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Shaoze Cheng
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Xia Yuan
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Jing Jin
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Chen Zhang
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Xiaolin Sun
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Jiuzhou Song
- Animal & Avian Sciences, University of Maryland, College Park, MD 20741, USA;
| | - Qisheng Zuo
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Yani Zhang
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Guohong Chen
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
| | - Bichun Li
- Key Laboratory of Animal Breeding Reproduction and Molecular Design for Jiangsu Province, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China; (J.J.); (C.C.); (S.C.); (X.Y.); (J.J.); (C.Z.); (X.S.); (Q.Z.); (Y.Z.); (G.C.)
- Correspondence:
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Chung ST, Galvan-De La Cruz M, Aldana PC, Mabundo LS, DuBose CW, Onuzuruike AU, Walter M, Gharib AM, Courville AB, Sherman AS, Sumner AE. Postprandial Insulin Response and Clearance Among Black and White Women: The Federal Women's Study. J Clin Endocrinol Metab 2019; 104:181-192. [PMID: 30260396 PMCID: PMC6286409 DOI: 10.1210/jc.2018-01032] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 09/21/2018] [Indexed: 12/12/2022]
Abstract
CONTEXT Postprandial hyperinsulinemia might be an important cardiometabolic risk determinant in black compared with white women. However, the contributions of insulin clearance and β-cell function to racial differences in postprandial insulin response are unknown. OBJECTIVE To compare, by race and menopause, early insulin response to oral and intravenous glucose and to measure postprandial intact glucagon-like peptide 1 (GLP-1) concentrations, insulin clearance, and β-cell function. DESIGN AND PARTICIPANTS 119 federally employed women without diabetes [87 premenopausal (52 black, 35 white) and 32 postmenopausal (19 black, 13 white)] underwent an oral glucose tolerance test, insulin-modified frequently sampled intravenous glucose test (IM-FSIGT), and mixed meal tolerance test (MMTT). OUTCOME MEASURES Early insulin response was measured as follows: (i) insulinogenic index (oral glucose tolerance test); (ii) acute insulin response to glucose (IM-FSIGT); and (iii) ratio of incremental insulin/glucose area under the curve in the first 30 minutes of the MMTT. Insulin clearance was assessed during the IM-FSIGT and MMTT. During the MMTT, intact GLP-1 was measured and β-cell function assessed using the insulin secretion rate and β-cell responsivity indexes. RESULTS Black pre-menopausal and postmenopausal women had a greater insulin response and lower insulin clearance and greater dynamic β-cell responsivity (P ≤ 0.05 for all). No differences were found in the total insulin secretion rates or intact GLP-1 concentrations. CONCLUSIONS Greater postprandial hyperinsulinemia in black pre-menopausal and postmenopausal women was associated with lower hepatic insulin clearance and heightened β-cell capacity to rapid changes in glucose, but not to higher insulin secretion. The relationship of increased β-cell secretory capacity, reduced insulin clearance, and ambient hyperinsulinemia to the development of cardiometabolic disease requires further investigation.
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Affiliation(s)
- Stephanie T Chung
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
- Correspondence and Reprint Requests: Stephanie T. Chung, MBBS, Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Building 10-CRC, Room 5-3671, 10 Center Drive, Bethesda, Maryland 20892. E-mail:
| | - Mirella Galvan-De La Cruz
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Paola C Aldana
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Lilian S Mabundo
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Christopher W DuBose
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Anthony U Onuzuruike
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Mary Walter
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Ahmed M Gharib
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | | | - Arthur S Sherman
- Laboratory of Biological Modeling, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Anne E Sumner
- Section on Ethnicity and Health, Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
- National Institute of Minority Health and Health Disparities, National Institutes of Health, Bethesda, Maryland
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Rojas-Gutierrez E, Muñoz-Arenas G, Treviño S, Espinosa B, Chavez R, Rojas K, Flores G, Díaz A, Guevara J. Alzheimer's disease and metabolic syndrome: A link from oxidative stress and inflammation to neurodegeneration. Synapse 2017. [PMID: 28650104 DOI: 10.1002/syn.21990] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD) is the most common cause of dementia and one of the most important causes of morbidity and mortality among the aging population. AD diagnosis is made post-mortem, and the two pathologic hallmarks, particularly evident in the end stages of the illness, are amyloid plaques and neurofibrillary tangles. Currently, there is no curative treatment for AD. Additionally, there is a strong relation between oxidative stress, metabolic syndrome, and AD. The high levels of circulating lipids and glucose imbalances amplify lipid peroxidation that gradually diminishes the antioxidant systems, causing high levels of oxidative metabolism that affects cell structure, leading to neuronal damage. Accumulating evidence suggests that AD is closely related to a dysfunction of both insulin signaling and glucose metabolism in the brain, leading to an insulin-resistant brain state. Four drugs are currently used for this pathology: Three FDA-approved cholinesterase inhibitors and one NMDA receptor antagonist. However, wide varieties of antioxidants are promissory to delay or prevent the symptoms of AD and may help in treating the disease. Therefore, therapeutic efforts to achieve attenuation of oxidative stress could be beneficial in AD treatment, attenuating Aβ-induced neurotoxicity and improve neurological outcomes in AD. The term inflammaging characterizes a widely accepted paradigm that aging is accompanied by a low-grade chronic up-regulation of certain pro-inflammatory responses in the absence of overt infection, and is a highly significant risk factor for both morbidity and mortality in the elderly.
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Affiliation(s)
- Eduardo Rojas-Gutierrez
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Guadalupe Muñoz-Arenas
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Puebla, Pue, Mexico
| | - Samuel Treviño
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Puebla, Pue, Mexico
| | - Blanca Espinosa
- Departamento de Bioquímica, Instituto Nacional de Enfermedades Respiratorias-INER, Ciudad de México, Mexico
| | - Raúl Chavez
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Karla Rojas
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Gonzalo Flores
- Instituto de Fisiología, Benemérita Universidad Autónoma de Puebla, Puebla, Pue, Mexico
| | - Alfonso Díaz
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Puebla, Pue, Mexico
| | - Jorge Guevara
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
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Schupf N, Lee A, Park N, Dang LH, Pang D, Yale A, Oh DKT, Krinsky-McHale SJ, Jenkins EC, Luchsinger JA, Zigman WB, Silverman W, Tycko B, Kisselev S, Clark L, Lee JH. Candidate genes for Alzheimer's disease are associated with individual differences in plasma levels of beta amyloid peptides in adults with Down syndrome. Neurobiol Aging 2015; 36:2907.e1-10. [PMID: 26166206 DOI: 10.1016/j.neurobiolaging.2015.06.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 06/08/2015] [Accepted: 06/14/2015] [Indexed: 01/08/2023]
Abstract
We examined the contribution of candidates genes for Alzheimer's disease (AD) to individual differences in levels of beta amyloid peptides in adults with Down syndrom, a population at high risk for AD. Participants were 254 non-demented adults with Down syndrome, 30-78 years of age. Genomic deoxyribonucleic acid was genotyped using an Illumina GoldenGate custom array. We used linear regression to examine differences in levels of Aβ peptides associated with the number of risk alleles, adjusting for age, sex, level of intellectual disability, race and/or ethnicity, and the presence of the APOE ε4 allele. For Aβ42 levels, the strongest gene-wise association was found for a single nucleotide polymorphism (SNP) on CAHLM1; for Aβ40 levels, the strongest gene-wise associations were found for SNPs in IDE and SOD1, while the strongest gene-wise associations with levels of the Aβ42/Aβ40 ratio were found for SNPs in SORCS1. Broadly classified, variants in these genes may influence amyloid precursor protein processing (CALHM1, IDE), vesicular trafficking (SORCS1), and response to oxidative stress (SOD1).
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Affiliation(s)
- Nicole Schupf
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA; G.H. Sergievsky Center, New York, NY, USA; Department of Epidemiology, Columbia University Medical Center, New York, NY, USA; Department of Psychiatry, Columbia University Medical Center, New York, NY, USA.
| | - Annie Lee
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Naeun Park
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Lam-Ha Dang
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Deborah Pang
- Department of Psychology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Alexander Yale
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY, USA
| | - David Kyung-Taek Oh
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY, USA
| | - Sharon J Krinsky-McHale
- Department of Psychology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Edmund C Jenkins
- Department of Human Genetics, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - José A Luchsinger
- Department of Medicine, Columbia University Medical Center, New York, NY, USA
| | - Warren B Zigman
- Department of Psychology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Wayne Silverman
- Kennedy Krieger Institute and Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Benjamin Tycko
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY, USA
| | - Sergey Kisselev
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Lorraine Clark
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Joseph H Lee
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA; G.H. Sergievsky Center, New York, NY, USA; Department of Epidemiology, Columbia University Medical Center, New York, NY, USA
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8
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Reduced insulin clearance and lower insulin-degrading enzyme expression in the liver might contribute to the thrifty phenotype of protein-restricted mice. Br J Nutr 2014; 112:900-7. [PMID: 25036874 DOI: 10.1017/s0007114514001238] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Nutrient restriction during the early stages of life usually leads to alterations in glucose homeostasis, mainly insulin secretion and sensitivity, increasing the risk of metabolic disorders in adulthood. Despite growing evidence regarding the importance of insulin clearance during glucose homeostasis in health and disease, no information exists about this process in malnourished animals. Thus, in the present study, we aimed to determine the effect of a nutrient-restricted diet on insulin clearance using a model in which 30-d-old C57BL/6 mice were exposed to a protein-restricted diet for 14 weeks. After this period, we evaluated many metabolic variables and extracted pancreatic islet, liver, gastrocnemius muscle (GCK) and white adipose tissue samples from the control (normal-protein diet) and restricted (low-protein diet, LP) mice. Insulin concentrations were determined using RIA and protein expression and phosphorylation by Western blot analysis. The LP mice exhibited lower body weight, glycaemia, and insulinaemia, increased glucose tolerance and altered insulin dynamics after the glucose challenge. The improved glucose tolerance could partially be explained by an increase in insulin sensitivity through the phosphorylation of the insulin receptor/protein kinase B and AMP-activated protein kinase/acetyl-CoA carboxylase in the liver, whereas the changes in insulin dynamics could be attributed to reduced insulin secretion coupled with reduced insulin clearance and lower insulin-degrading enzyme (IDE) expression in the liver and GCK. In summary, protein-restricted mice not only produce and secrete less insulin, but also remove and degrade less insulin. This phenomenon has the double benefit of sparing insulin while prolonging and potentiating its effects, probably due to the lower expression of IDE in the liver, possibly with long-term consequences.
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Brandimarti P, Costa-Júnior JM, Ferreira SM, Protzek AO, Santos GJ, Carneiro EM, Boschero AC, Rezende LF. Cafeteria diet inhibits insulin clearance by reduced insulin-degrading enzyme expression and mRNA splicing. J Endocrinol 2013; 219:173-82. [PMID: 23959080 DOI: 10.1530/joe-13-0177] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Insulin clearance plays a major role in glucose homeostasis and insulin sensitivity in physiological and/or pathological conditions, such as obesity-induced type 2 diabetes as well as diet-induced obesity. The aim of the present work was to evaluate cafeteria diet-induced obesity-induced changes in insulin clearance and to explain the mechanisms underlying these possible changes. Female Swiss mice were fed either a standard chow diet (CTL) or a cafeteria diet (CAF) for 8 weeks, after which we performed glucose tolerance tests, insulin tolerance tests, insulin dynamics, and insulin clearance tests. We then isolated pancreatic islets for ex vivo glucose-stimulated insulin secretion as well as liver, gastrocnemius, visceral adipose tissue, and hypothalamus for subsequent protein analysis by western blot and determination of mRNA levels by real-time RT-PCR. The cafeteria diet induced insulin resistance, glucose intolerance, and increased insulin secretion and total insulin content. More importantly, mice that were fed a cafeteria diet demonstrated reduced insulin clearance and decay rate as well as reduced insulin-degrading enzyme (IDE) protein and mRNA levels in liver and skeletal muscle compared with the control animals. Furthermore, the cafeteria diet reduced IDE expression and alternative splicing in the liver and skeletal muscle of mice. In conclusion, a cafeteria diet impairs glucose homeostasis by reducing insulin sensitivity, but it also reduces insulin clearance by reducing IDE expression and alternative splicing in mouse liver; however, whether this mechanism contributes to the glucose intolerance or helps to ameliorate it remains unclear.
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Affiliation(s)
- P Brandimarti
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas (UNICAMP), PO Box 6109, Campinas, SP, CEP 13083-865, Brazil
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10
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McFall GP, Wiebe SA, Vergote D, Westaway D, Jhamandas J, Dixon RA. IDE (rs6583817) polymorphism and type 2 diabetes differentially modify executive function in older adults. Neurobiol Aging 2013; 34:2208-16. [PMID: 23597493 PMCID: PMC3679261 DOI: 10.1016/j.neurobiolaging.2013.03.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Revised: 02/27/2013] [Accepted: 03/11/2013] [Indexed: 12/28/2022]
Abstract
We tested independent and interactive contributions of a recently noted and promising insulin degrading enzyme polymorphism (IDE; rs6583817) and type 2 diabetes (T2D) to executive function performance, concurrently and longitudinally. Regarding normal neurocognitive decline and Alzheimer's disease, T2D is a known risk factor and this IDE variant might contribute risk or risk reduction via the minor (A) or major (G) allele. We compared normal aging and T2D groups (baseline n = 574; ages 53-95 years) over 2 longitudinal waves (mean interval = 4.4 years). We used confirmatory factor analysis, latent growth curve modeling, and path analysis. A confirmed single-factor model of 4 executive function tasks established the cognitive phenotype. This IDE variant predicted concurrent group differences and differential change in cognitive performance. Furthermore, the IDE major allele reduced risk of cognitive decline. T2D predicted performance only concurrently. Both IDE and T2D are associated with executive function levels in older adults, but only IDE moderated 2-wave change. Previously linked to Alzheimer's disease, this IDE variant should be further explored for its potential influence on cognitive phenotypes of normal aging.
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Affiliation(s)
- G. Peggy McFall
- Department of Psychology, University of Alberta, Edmonton, Canada
| | - Sandra A. Wiebe
- Department of Psychology, University of Alberta, Edmonton, Canada
- Centre for Neuroscience, University of Alberta, Edmonton, Canada
| | - David Vergote
- Centre for Prions and Protein Folding Diseases, University of Alberta, Edmonton, Canada
| | - David Westaway
- Centre for Neuroscience, University of Alberta, Edmonton, Canada
- Centre for Prions and Protein Folding Diseases, University of Alberta, Edmonton, Canada
| | - Jack Jhamandas
- Centre for Neuroscience, University of Alberta, Edmonton, Canada
- Department of Medicine (Neurology), University of Alberta, Edmonton, Canada
| | - Roger A. Dixon
- Department of Psychology, University of Alberta, Edmonton, Canada
- Centre for Neuroscience, University of Alberta, Edmonton, Canada
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11
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Lam VKL, Ma RCW, Lee HM, Hu C, Park KS, Furuta H, Wang Y, Tam CHT, Sim X, Ng DPK, Liu J, Wong TY, Tai ES, Morris AP, Tang NLS, Woo J, Leung PC, Kong APS, Ozaki R, Jia WP, Lee HK, Nanjo K, Xu G, Ng MCY, So WY, Chan JCN. Genetic associations of type 2 diabetes with islet amyloid polypeptide processing and degrading pathways in asian populations. PLoS One 2013; 8:e62378. [PMID: 23776430 PMCID: PMC3679113 DOI: 10.1371/journal.pone.0062378] [Citation(s) in RCA: 7] [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: 07/14/2012] [Accepted: 03/21/2013] [Indexed: 01/09/2023] Open
Abstract
Type 2 diabetes (T2D) is a complex disease characterized by beta cell dysfunctions. Islet amyloid polypeptide (IAPP) is highly conserved and co-secreted with insulin with over 40% of autopsy cases of T2D showing islet amyloid formation due to IAPP aggregation. Dysregulation in IAPP processing, stabilization and degradation can cause excessive oligomerization with beta cell toxicity. Previous studies examining genetic associations of pathways implicated in IAPP metabolism have yielded conflicting results due to small sample size, insufficient interrogation of gene structure and gene-gene interactions. In this multi-staged study, we screened 89 tag single nucleotide polymorphisms (SNPs) in 6 candidate genes implicated in IAPP metabolism and tested for independent and joint associations with T2D and beta cell dysfunctions. Positive signals in the stage-1 were confirmed by de novo and in silico analysis in a multi-centre unrelated case-control cohort. We examined the association of significant SNPs with quantitative traits in a subset of controls and performed bioinformatics and relevant functional analyses. Amongst the tag SNPs, rs1583645 in carboxypeptidase E (CPE) and rs6583813 in insulin degrading enzyme (IDE) were associated with 1.09 to 1.28 fold increased risk of T2D (PMeta = 9.4×10−3 and 0.02 respectively) in a meta-analysis of East Asians. Using genetic risk scores (GRS) with each risk variant scoring 1, subjects with GRS≥3 (8.2% of the cohort) had 56% higher risk of T2D than those with GRS = 0 (P = 0.01). In a subcohort of control subjects, plasma IAPP increased and beta cell function index declined with GRS (P = 0.008 and 0.03 respectively). Bioinformatics and functional analyses of CPE rs1583645 predicted regulatory elements for chromatin modification and transcription factors, suggesting differential DNA-protein interactions and gene expression. Taken together, these results support the importance of dysregulation of IAPP metabolism in T2D in East Asians.
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Affiliation(s)
- Vincent Kwok Lim Lam
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Ronald Ching Wan Ma
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
- Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Hong Kong SAR, People's Republic of China
- Li Ka Shing Institute of Health, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Heung Man Lee
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Cheng Hu
- Department of Endocrinology and Metabolism, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Clinical Center for Diabetes, Shanghai Key Clinical Center for Metabolic Disease, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Kyong Soo Park
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology and Department of Internal Medicine, College of Medicine, Seoul National University, Chongno-gu, Seoul, Korea
| | - Hiroto Furuta
- First Department of Medicine, Wakayama Medical University, Wakayama, Japan
| | - Ying Wang
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Claudia Ha Ting Tam
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Xueling Sim
- Centre for Molecular Epidemiology, Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Daniel Peng-Keat Ng
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Jianjun Liu
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
- Genome Institute of Singapore, Agency for Science, Technology and Research, Singapore, Singapore
| | - Tien-Yin Wong
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - E. Shyong Tai
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Duke-National University of Singapore Graduate Medical School, Singapore, Singapore
| | - Andrew P. Morris
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | | | - Nelson Leung Sang Tang
- Department of Chemical Pathology, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Jean Woo
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Ping Chung Leung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Alice Pik Shan Kong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Risa Ozaki
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Wei Ping Jia
- Department of Endocrinology and Metabolism, Shanghai Diabetes Institute, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Clinical Center for Diabetes, Shanghai Key Clinical Center for Metabolic Disease, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Hong Kyu Lee
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology and Department of Internal Medicine, College of Medicine, Seoul National University, Chongno-gu, Seoul, Korea
| | - Kishio Nanjo
- First Department of Medicine, Wakayama Medical University, Wakayama, Japan
| | - Gang Xu
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
- Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Hong Kong SAR, People's Republic of China
- Li Ka Shing Institute of Health, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Maggie Chor Yin Ng
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Wing-Yee So
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
| | - Juliana Chung Ngor Chan
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
- Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Hong Kong SAR, People's Republic of China
- Li Ka Shing Institute of Health, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin, Hong Kong SAR, People's Republic of China
- * E-mail:
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12
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Kwak SH, Park BL, Kim H, German MS, Go MJ, Jung HS, Koo BK, Cho YM, Choi SH, Cho YS, Shin HD, Jang HC, Park KS. Association of variations in TPH1 and HTR2B with gestational weight gain and measures of obesity. Obesity (Silver Spring) 2012; 20:233-8. [PMID: 21836641 DOI: 10.1038/oby.2011.253] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Serotonin is involved in appetite regulation and energy homeostasis. Recently, it has been reported that 5-hydroxytryptamine receptor 2B (Htr2b) and tryptophan hydroxylase 1 (Tph1) play major role in β-cell proliferation in mouse during pregnancy. We investigated the genetic association of HTR2B and TPH1 with risk of gestational diabetes mellitus (GDM) and measures of obesity, in 869 Korean GDM women and carefully selected 632 nondiabetic control subjects. Six single-nucleotide polymorphisms (SNPs) in HTR2B and ten SNPs in TPH1 were selected for genotyping according to their tagging status. Genetic variants in HTR2B and TPH1 were not associated with the risk of GDM. In GDM women, SNPs of TPH1 were significantly associated with weight gain during pregnancy. In nondiabetic controls, SNPs of TPH1 were associated with waist circumference and BMI. We also found that a variant of TPH1 (rs623580) was associated with BMI in a genome-wide association study comprised of 8,842 subjects. Although genetic variants in HTR2B and TPH1 were not associated with risk of GDM, we found significant association of these variants with measures of obesity. However, further replication studies in a different population are required to confirm our findings.
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Affiliation(s)
- Soo Heon Kwak
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
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Abstract
Type 2 diabetes mellitus (T2DM) is caused by complex interplay between multiple genetic and environmental factors. The three major approaches used to identify the genetic susceptibility include candidate gene approach, familial linkage analysis and genome- wide association analysis. Recent advance in genome-wide association studies have greatly improved our understanding of the pathophysiology of T2DM. As of the end of 2010, there are more than 40 confirmed T2DM-associated genetic loci. Most of the T2DM susceptibility genes were implicated in decreased β-cell function. However, these genetic variations have a modest effect and their combination only explains less than 10% of the T2DM heritability. With the advent of the next-generation sequencing technology, we will soon identify rare variants of larger effect as well as causal variants. These advances in understanding the genetics of T2DM will lead to the development of new therapeutic and preventive strategies and individualized medicine.
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Affiliation(s)
- Kyong Soo Park
- Department of Internal Medicine and Department of Molecular Medicine and Biopharmaceutical Sciences, Seoul National University College of Medicine, Seoul, Korea
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Hwang I, Yoon T, Kim C, Cho B, Lee S, Song MK. Different roles of zinc plus arachidonic acid on insulin sensitivity between high fructose- and high fat-fed rats. Life Sci 2010; 88:278-84. [PMID: 21167181 DOI: 10.1016/j.lfs.2010.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 11/11/2010] [Accepted: 11/17/2010] [Indexed: 11/18/2022]
Abstract
AIMS This study was to determine the effects of zinc plus arachidonic acid (ZA) treatment on the insulin action in the specific ZA target organs using hyperinsulinemic euglycemic clamp method. MAIN METHODS 18 Sprague-Dawley rats weighing ~130 g were divided into 3 groups of 6 rats and treated them with 1) normal rat chow, 2) high fructose (60.0%) diet only, or 3) the same fructose diet plus drinking water containing 10mg zinc plus 50mg arachidonic acid (AA)/L. In a separate study, male Wistar rats weighing ~250 g were fed normal rat chow (n=4) or high fat (66.5%) diet with drinking water containing zero (n=9) or 10mg AA plus 20mg zinc /L (n=9). After 4 week treatment, insulin action was assessed using the hyperinsulinemic eguglycemic clamp technique. KEY FINDINGS High fructose feeding impaired suppression of hepatic glucose output by insulin compared to controls during the clamp procedure (4.39 vs. 2.35 mg/kg/min; p<0.05). However, ZA treatment in high fructose-fed rats showed a significant improvement of hepatic insulin sensitivity compared to non-treatment controls (4.39 vs. 2.18 mg/kg/min; p<0.05). Glucose infusion rates in Wistar rats maintained on a high fat diet (HFD) were significantly lower compared to control rats (22.8 ± 1.3 vs. 31.9 ± 1.4 mg/kg/min; p<0.05). ZA treatment significantly improved (~43%) peripheral tissue insulin sensitivity in HFD fed animals (26.7 ± 1.3 [n=9] vs. 22.8 ± 1.3mg/kg/min; p<0.05). SIGNIFICANCE These data demonstrate that ZA treatment is effective in improving glucose utilization in hyperglycemic rats receiving either a high-fructose or a high-fat diet.
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Affiliation(s)
- Inkyung Hwang
- Department of Preventive Medicine, College of Medicine, Pusan National University, Pusan, Republic of Korea
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15
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Aleshin AE, Gramatikova S, Hura GL, Bobkov A, Strongin AY, Stec B, Tainer JA, Liddington RC, Smith JW. Crystal and solution structures of a prokaryotic M16B peptidase: an open and shut case. Structure 2010; 17:1465-75. [PMID: 19913481 DOI: 10.1016/j.str.2009.09.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Revised: 08/22/2009] [Accepted: 09/04/2009] [Indexed: 10/20/2022]
Abstract
The M16 family of zinc peptidases comprises a pair of homologous domains that form two halves of a "clam-shell" surrounding the active site. The M16A and M16C subfamilies form one class ("peptidasomes"): they degrade 30-70 residue peptides, and adopt both open and closed conformations. The eukaryotic M16B subfamily forms a second class ("processing proteases"): they adopt a single partly-open conformation that enables them to cleave signal sequences from larger proteins. Here, we report the solution and crystal structures of a prokaryotic M16B peptidase, and demonstrate that it has features of both classes: thus, it forms stable "open" homodimers in solution that resemble the processing proteases; but the clam-shell closes upon binding substrate, a feature of the M16A/C peptidasomes. Moreover, clam-shell closure is required for proteolytic activity. We predict that other prokaryotic M16B family members will form dimeric peptidasomes, and propose a model for the evolution of the M16 family.
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16
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Rudovich N, Pivovarova O, Fisher E, Fischer-Rosinsky A, Spranger J, Möhlig M, Schulze MB, Boeing H, Pfeiffer AFH. Polymorphisms within insulin-degrading enzyme (IDE) gene determine insulin metabolism and risk of type 2 diabetes. J Mol Med (Berl) 2009; 87:1145-51. [PMID: 19809796 DOI: 10.1007/s00109-009-0540-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 09/03/2009] [Accepted: 09/04/2009] [Indexed: 11/27/2022]
Abstract
Insulin-degrading enzyme (IDE) is the ubiquitously expressed major enzyme responsible for insulin degradation. Insulin-degrading enzyme gene is located on chromosome region 10q23-q25 and exhibits a well-replicated peak of linkage with type 2 diabetes (T2DM). Several genetic association studies examined IDE gene as a susceptibility gene for T2DM with controversial results. However, pathophysiological mechanisms involved have remained elusive. We verified associations of two IDE polymorphisms (rs1887922 and rs2149632) with T2DM risk in two independent German cohorts and evaluated in detail the association of common variants with insulin metabolism and glycemic traits. We confirmed previously published findings for diabetes-associated rs1887922 and rs2149632 in the European Prospective Investigation into Cancer and Nutrition-Potsdam cohort (n = 3049; RR 1.26, p = 0.003 and RR 1.33, p < 0.0001 for additive model). Haplotypes which carried one risk allele of rs2149632 or two risk alleles of both studied IDE SNPs also demonstrated a strong association with increased T2DM risk in this cohort (p = 0.001 and p < 0.0001, respectively). However, we found no significant T2DM association in the cross-sectional metabolic syndrome Berlin-Potsdam cohort (n = 1026). In nondiabetic subjects (NGT+IFG/IGT; n = 739), we found an association of rs2149632 with impaired glucose-derived insulin secretion and a trend to decreased insulin sensitivity for rs1887922. In the NGT subjects (n = 440), the association with decreased insulin secretion for rs2149632 remain significant, and the association with decreased hepatic insulin degradation for rs1887922 were observed additionally. This study validates and confirms the association of IDE polymorphisms with T2DM risk in the prospective German cohort and provides novel evidence of influences of IDE genetic variants on insulin metabolism.
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Affiliation(s)
- Natalia Rudovich
- Department of Internal Medicine, Division of Endocrinology, Diabetes, and Nutrition, Campus Benjamin Franklin, Charité University Medicine, Berlin, Germany.
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17
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Lu X, Huang Y, Liu Y, Wu X, Shi X. Variants in the insulin-degrading enzyme gene are associated with metabolic syndrome in Chinese elders. Metabolism 2009; 58:1465-9. [PMID: 19592050 DOI: 10.1016/j.metabol.2009.04.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Accepted: 04/02/2009] [Indexed: 12/20/2022]
Abstract
Metabolic syndrome (MetS) is a cluster of metabolic abnormalities sharing potential common underlying mechanisms. Insulin-degrading enzyme (IDE) plays a primary role in insulin degradation and cellular insulin processing and therefore affects glucose and lipid metabolism. Genetic association studies have been focused on the relationship between the IDE gene and the development of MetS. To identify specific genetic risks for MetS associated with IDE gene, a case-control association study was performed on 563 Chinese elders in Shanghai, China. Cases were those with MetS (n = 241), and controls were those without MetS (n = 219). Five unrelated genetic markers (single nucleotide polymorphisms) at the IDE gene were used for association analyses. The single-locus association analysis revealed that the A/T allele of rs11187033 was associated with MetS (odds ratio = 0.698; 95% confidence interval, 0.526-0.928; P = .013). Patients with MetS had more haplotype G-T-Ts than controls (P = .008). None of the other 4 single nucleotide polymorphisms was significantly associated with MetS. This result suggests that the rs11187033 at IDE gene might contribute to MetS susceptibility in Chinese elders.
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Affiliation(s)
- Xiaozhe Lu
- Department of Geriatrics, Huashan Hospital, Fudan University, Shanghai 200040, China
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Pivovarova O, Gögebakan O, Pfeiffer AFH, Rudovich N. Glucose inhibits the insulin-induced activation of the insulin-degrading enzyme in HepG2 cells. Diabetologia 2009; 52:1656-64. [PMID: 19396426 DOI: 10.1007/s00125-009-1350-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2009] [Accepted: 03/06/2009] [Indexed: 11/25/2022]
Abstract
AIMS/HYPOTHESIS Hepatic insulin degradation decreases in type 2 diabetes. Insulin-degrading enzyme (IDE) plays a key role in insulin degradation and its gene is located in a diabetes-associated chromosomal region. We hypothesised that IDE may be regulated by insulin and/or glucose in a liver cell model. To validate the observed regulation of IDE in vivo, we analysed biopsies of human adipose tissue during different clamp experiments in men. METHODS Human hepatoma HepG2 cells were incubated in normal (1 g/l) or high (4.5 g/l) glucose medium and treated with insulin for 24 h. Catalytic activity, mRNA and protein levels of IDE were assessed. IDE mRNA levels were measured in biopsies of human subcutaneous adipose tissue before and at 240 min of hyperinsulinaemic, euglycaemic and hyperglycaemic clamps. RESULTS In HepG2 cells, insulin increased IDE activity under normal glucose conditions with no change in IDE mRNA or protein levels. Under conditions of high glucose, insulin increased mRNA levels of IDE without changes in IDE activity. Both in normal and high glucose medium, insulin increased levels of the catalytically more active 15a IDE isoform compared with the 15b isoform. In subcutaneous adipose tissue, IDE mRNA levels were not significantly upregulated after euglycaemic or hyperglycaemic clamps. CONCLUSIONS/INTERPRETATION Insulin increases IDE activity in HepG2 cells in normal but not in high glucose conditions. This disturbance cannot be explained by corresponding alterations in IDE protein levels or IDE splicing. The loss of insulin-induced regulation of IDE activity under hyperglycaemia may contribute to the reduced insulin extraction and peripheral hyperinsulinaemia in type 2 diabetes.
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Affiliation(s)
- O Pivovarova
- Department of Clinical Nutrition, German Institute of Human Nutrition Potsdam-Rehbruecke, 14558 Nuthetal, Germany.
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Chen R, Morgan AA, Dudley J, Deshpande T, Li L, Kodama K, Chiang AP, Butte AJ. FitSNPs: highly differentially expressed genes are more likely to have variants associated with disease. Genome Biol 2008; 9:R170. [PMID: 19061490 PMCID: PMC2646274 DOI: 10.1186/gb-2008-9-12-r170] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2008] [Revised: 09/26/2008] [Accepted: 12/05/2008] [Indexed: 12/18/2022] Open
Abstract
Differential expressed genes are more likely to have variants associated with disease. A new tool, fitSNP, prioritizes candidate SNPs from association studies. Background Candidate single nucleotide polymorphisms (SNPs) from genome-wide association studies (GWASs) were often selected for validation based on their functional annotation, which was inadequate and biased. We propose to use the more than 200,000 microarray studies in the Gene Expression Omnibus to systematically prioritize candidate SNPs from GWASs. Results We analyzed all human microarray studies from the Gene Expression Omnibus, and calculated the observed frequency of differential expression, which we called differential expression ratio, for every human gene. Analysis conducted in a comprehensive list of curated disease genes revealed a positive association between differential expression ratio values and the likelihood of harboring disease-associated variants. By considering highly differentially expressed genes, we were able to rediscover disease genes with 79% specificity and 37% sensitivity. We successfully distinguished true disease genes from false positives in multiple GWASs for multiple diseases. We then derived a list of functionally interpolating SNPs (fitSNPs) to analyze the top seven loci of Wellcome Trust Case Control Consortium type 1 diabetes mellitus GWASs, rediscovered all type 1 diabetes mellitus genes, and predicted a novel gene (KIAA1109) for an unexplained locus 4q27. We suggest that fitSNPs would work equally well for both Mendelian and complex diseases (being more effective for cancer) and proposed candidate genes to sequence for their association with 597 syndromes with unknown molecular basis. Conclusions Our study demonstrates that highly differentially expressed genes are more likely to harbor disease-associated DNA variants. FitSNPs can serve as an effective tool to systematically prioritize candidate SNPs from GWASs.
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Affiliation(s)
- Rong Chen
- Stanford Center for Biomedical Informatics Research, 251 Cmpus Drive, Stanford, CA 94305, USA.
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