1
|
Henquin JC. Non-glucose modulators of insulin secretion in healthy humans: (dis)similarities between islet and in vivo studies. Metabolism 2021; 122:154821. [PMID: 34174327 DOI: 10.1016/j.metabol.2021.154821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/10/2021] [Accepted: 06/18/2021] [Indexed: 12/17/2022]
Abstract
Optimal metabolic homeostasis requires precise temporal and quantitative control of insulin secretion. Both in vivo and in vitro studies have often focused on the regulation by glucose although many additional factors including other nutrients, neurotransmitters, hormones and drugs, modulate the secretory function of pancreatic β-cells. This review is based on the analysis of clinical investigations characterizing the effects of non-glucose modulators of insulin secretion in healthy subjects, and of experimental studies testing the same modulators in islets isolated from normal human donors. The aim was to determine whether the information gathered in vitro can reliably be translated to the in vivo situation. The comparison evidenced both convincing similarities and areas of discordance. The lack of coherence generally stems from the use of exceedingly high concentrations of test agents at too high or too low glucose concentrations in vitro, which casts doubts on the physiological relevance of a number of observations made in isolated islets. Future projects resorting to human islets should avoid extreme experimental conditions, such as oversized stimulations or inhibitions of β-cells, which are unlikely to throw light on normal insulin secretion and contribute to the elucidation of its defects.
Collapse
Affiliation(s)
- Jean-Claude Henquin
- Unit of Endocrinology and Metabolism, Faculty of Medicine, University of Louvain, Brussels, Belgium.
| |
Collapse
|
2
|
Trischitta V, Prudente S, Doria A. Disentangling the heterogeneity of adulthood-onset non-autoimmune diabetes: a little closer but lot more to do. Curr Opin Pharmacol 2020; 55:157-164. [PMID: 33271410 DOI: 10.1016/j.coph.2020.10.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/13/2020] [Accepted: 10/26/2020] [Indexed: 12/13/2022]
Abstract
Diabetes diagnosed in adults is a highly heterogeneous disorder. It mostly consists of what is referred to as type 2 diabetes but also comprises other entities (i.e. different diseases), including latent autoimmune diabetes, late onset forms of monogenic diabetes and familial diabetes of the adulthood, which has recently been the source of new diabetogenes discovery. Notably, type 2 diabetes is itself heterogeneous as it includes subtypes with onset at the extremes of age and/or weight distributions characterized by different degree of hyperglycemia and cardiovascular risk as compared to common forms of type 2 diabetes occurring in middle-aged, overweight/obese individuals. Understanding whether these are different presentations of one, highly heterogeneous disease or separate nosological entities with different clinical trajectories and requiring different treatments is essential to effectively pursue the path of precision medicine.
Collapse
Affiliation(s)
- Vincenzo Trischitta
- Research Unit of Metabolic and Cardiovascular Diseases, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, Rome, Italy.
| | - Sabrina Prudente
- Research Unit of Metabolic and Cardiovascular Diseases, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Alessandro Doria
- Research Division, Joslin Diabetes Center, Boston, MA, USA; Department of Medicine, Harvard Medical School, Boston, MA, USA.
| |
Collapse
|
3
|
Kang K, Sun X, Wang L, Yao X, Tang S, Deng J, Wu X, Yang C, Chen G. Direct-to-consumer genetic testing in China and its role in GWAS discovery and replication. QUANTITATIVE BIOLOGY 2020. [DOI: 10.1007/s40484-020-0209-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
4
|
Fischer Z, Das R, Shipman A, Fan JY, Pence L, Bouyain S, Dobens LL. A Drosophila model of insulin resistance associated with the human TRIB3 Q/R polymorphism. Dis Model Mech 2017; 10:1453-1464. [PMID: 29025897 PMCID: PMC5769606 DOI: 10.1242/dmm.030619] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 10/05/2017] [Indexed: 12/12/2022] Open
Abstract
Members of the Tribbles family of proteins are conserved pseudokinases with diverse roles in cell growth and proliferation. Both Drosophila Tribbles (Trbl) and vertebrate Trib3 proteins bind to the kinase Akt (Akt1) to block its phosphorylation activation and reduce downstream insulin-stimulated anabolism. A single nucleotide polymorphism (SNP) variant in human TRIB3, which results in a glutamine (Q) to arginine (R) missense mutation in a conserved motif at position 84, confers stronger Akt binding, resulting in reduced Akt phosphorylation, and is associated with a predisposition to Type 2 diabetes, cardiovascular disease, diabetic nephropathy, chronic kidney disease and leukemogenesis. Here, we used a Drosophila model to understand the importance of the conserved R residue in several Trbl functions. In the fly fat body, misexpression of a site-directed Q mutation at position R141 resulted in weakened binding to Drosophila Akt (dAkt), leading to increased levels of phospho-dAkt, increased cell and tissue size, and increases in the levels of stored glycogen and triglycerides. Consistent with the functional conservation of this arginine in modulating Akt activity, mouse Trib3 R84 misexpressed in the fly fat body blocked dAkt phosphorylation with a strength similar to wild-type Trbl. Limited mutational analysis shows that the R141 site dictates the strength of Akt binding but does not affect other Trbl-dependent developmental processes, suggesting a specificity that could serve as a drug target for metabolic diseases.
Collapse
Affiliation(s)
- Zachary Fischer
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Rahul Das
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Anna Shipman
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Jin-Yuan Fan
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Laramie Pence
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Samuel Bouyain
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| | - Leonard L Dobens
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO 64110, USA
| |
Collapse
|
5
|
Caporarello N, Parrino C, Trischitta V, Frittitta L. Insulin receptor signaling and glucagon-like peptide 1 effects on pancreatic beta cells. PLoS One 2017; 12:e0181190. [PMID: 28767692 PMCID: PMC5540605 DOI: 10.1371/journal.pone.0181190] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 06/26/2017] [Indexed: 12/03/2022] Open
Abstract
Glucagon-like peptide-1 (GLP-1) is a potent gluco-incretin hormone, which plays a central role on pancreatic beta cell proliferation, survival and insulin secreting activity and whose analogs are used for treating hyperglycemia in type 2 diabetes mellitus. Notably, abnormal insulin signaling affects all the above-mentioned aspects on pancreatic beta cells. The aim of our study was to investigate whether the protective effects of GLP1-1 on beta cells are affected by altered insulin receptor signaling. To this end, several effects of GLP-1 were studied in INS-1E rat beta cells transfected either with an inhibitor of insulin receptor function (i.e., the Ectonucleotide Pyrophosphatase Phosphodiesterase 1, ENPP1), or with insulin receptor small interfering RNA, as well as in control cells. Crucial experiments were carried out also in a second cell line, namely the βTC-1 mouse beta cells. Our data indicate that in insulin secreting beta cells in which either ENPP1 was up-regulated or insulin receptor was down-regulated, GLP-1 positive effects on several pancreatic beta cell activities, including glucose-induced insulin secretion, cell proliferation and cell survival, were strongly reduced. Further studies are needed to understand whether such a scenario occurs also in humans and, if so, if it plays a role of clinical relevance in diabetic patients with poor responsiveness to GLP-1 related treatments.
Collapse
Affiliation(s)
- Nunzia Caporarello
- Endocrine Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Cristina Parrino
- Endocrine Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Vincenzo Trischitta
- IRCCS Casa Sollievo della Sofferenza, Research Unit of Diabetes and Endocrine Diseases, San Giovanni Rotondo, Italy
- Department of Experimental Medicine “Sapienza” University, Rome, Italy
| | - Lucia Frittitta
- Endocrine Unit, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
- * E-mail:
| |
Collapse
|
6
|
Pacilli A, Prudente S, Copetti M, Fontana A, Mercuri L, Bacci S, Marucci A, Alberico F, Viti R, Palena A, Lamacchia O, Cignarelli M, De Cosmo S, Trischitta V. The PPARγ2 P12A polymorphism is not associated with all-cause mortality in patients with type 2 diabetes mellitus. Endocrine 2016; 54:38-46. [PMID: 26956846 DOI: 10.1007/s12020-016-0906-9] [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: 10/11/2015] [Accepted: 02/19/2016] [Indexed: 11/26/2022]
Abstract
The high mortality risk of patients with type 2 diabetes mellitus may well be explained by the several comorbidities and/or complications. Also the intrinsic genetic component predisposing to diabetes might have a role in shaping the risk of diabetes-related mortality. Among type 2 diabetes mellitus SNPs, rs1801282 is of particular interest because (i) it is harbored by peroxisome proliferator-activated receptor-γ2 (PPARγ2), which is the target for thiazolidinediones which are used as antidiabetic drugs, decreasing all-cause mortality in type 2 diabetes mellitus, and (ii) it is associated with insulin resistance and related traits, risk factors for overall mortality in type 2 diabetes mellitus. We investigated the role of PPARγ2 P12A, according to a dominant model (PA + AA vs. PP individuals) on incident all-cause mortality in three cohorts of type 2 diabetes mellitus, comprising a total of 1672 patients (462 deaths) and then performed a meta-analysis of ours and all available published data. In the three cohorts pooled and analyzed together, no association between PPARγ2 P12A and all-cause mortality was observed (HR 1.02, 95 % CI 0.79-1.33). Similar results were observed after adjusting for age, sex, smoking habits, and BMI (HR 1.09, 95 % CI 0.83-1.43). In a meta-analysis of ours and all studies previously published (n = 3241 individuals; 666 events), no association was observed between PPARγ2 P12A and all-cause mortality (HR 1.07, 95 % CI 0.85-1.33). Results from our individual samples as well as from our meta-analysis suggest that the PPARγ2 P12A does not significantly affect all-cause mortality in patients with type 2 diabetes mellitus.
Collapse
Affiliation(s)
- Antonio Pacilli
- Department of Medical Sciences, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Sabrina Prudente
- Mendel-Laboratory, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Massimiliano Copetti
- Unit of Biostatistics, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Andrea Fontana
- Unit of Biostatistics, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Luana Mercuri
- Mendel-Laboratory, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Simonetta Bacci
- Department of Medical Sciences, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Antonella Marucci
- Research Unit of Diabetes and Endocrine Diseases, Scientific Institute "Casa Sollievo della Sofferenza", Viale Padre Pio, 71013, San Giovanni Rotondo, FG, Italy
| | - Federica Alberico
- Mendel-Laboratory, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Raffaella Viti
- Department of Medical Sciences, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Antonio Palena
- Department of Medical Sciences, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Olga Lamacchia
- Unit of Endocrinology and Metabolic Diseases, Department of Surgical and Medical Sciences, University of Foggia, Foggia, Italy
| | - Mauro Cignarelli
- Unit of Endocrinology and Metabolic Diseases, Department of Surgical and Medical Sciences, University of Foggia, Foggia, Italy
| | - Salvatore De Cosmo
- Department of Medical Sciences, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy
| | - Vincenzo Trischitta
- Mendel-Laboratory, Scientific Institute "Casa Sollievo della Sofferenza", San Giovanni Rotondo, FG, Italy.
- Research Unit of Diabetes and Endocrine Diseases, Scientific Institute "Casa Sollievo della Sofferenza", Viale Padre Pio, 71013, San Giovanni Rotondo, FG, Italy.
- Department of Experimental Medicine, "Sapienza" University of Rome, Rome, Italy.
| |
Collapse
|
7
|
The TRIB3 Q84R polymorphism, insulin resistance and related metabolic alterations. Biochem Soc Trans 2016; 43:1108-11. [PMID: 26517932 DOI: 10.1042/bst20150115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Insulin resistance is pathogenic for many prevalent disorders including type 2 diabetes mellitus (T2DM), cardiovascular disease (CVD), polycystic ovary syndrome, non-alcoholic fatty liver disease, Alzheimer's and Parkinson's diseases and several cancers. Unravelling molecular abnormalities of insulin resistance may therefore pave the way for tackling such heavy weight on healthcare systems. This review will be focused on studies addressing the role of genetic variability of TRIB3, an inhibitor of insulin signalling at the AKT level on insulin resistance and several related abnormalities. Studies carried out in several cultured cells clearly report that the TRIB3 Q84R missense polymorphism, is a gain-of-function amino acid substitution, with the Arg(84) variant being a stronger inhibitor of insulin-mediated AKT activation as compared with the more frequent Gln(84) variant. Given the key role of AKT in modulating not only insulin signalling but also insulin secretion, it was not surprising that β-cells and human pancreatic islets carrying the Arg(84) variant showed also impaired insulin secretion. Also, of note is that in human vein endothelial cells carrying the Arg(84) variant showed a reduced insulin-induced nitric oxide release, an established early atherosclerotic step. Accordingly with in vitro studies, in vivo studies indicate that TRIB3 Arg(84) is associated with insulin resistance, T2DM and several aspects of atherosclerosis, including overt CVD. In all, several data indicate that the TRIB3 Arg(84) variant plays a role on several aspects of glucose homoeostasis and atherosclerotic processes, thus unravelling new molecular pathogenic mechanisms of highly prevalent disorders such as T2DM and CVD.
Collapse
|
8
|
Mehta ZB, Fine N, Pullen TJ, Cane MC, Hu M, Chabosseau P, Meur G, Velayos-Baeza A, Monaco AP, Marselli L, Marchetti P, Rutter GA. Changes in the expression of the type 2 diabetes-associated gene VPS13C in the β-cell are associated with glucose intolerance in humans and mice. Am J Physiol Endocrinol Metab 2016; 311:E488-507. [PMID: 27329800 PMCID: PMC5005967 DOI: 10.1152/ajpendo.00074.2016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 06/20/2016] [Indexed: 12/31/2022]
Abstract
Single nucleotide polymorphisms (SNPs) close to the VPS13C, C2CD4A and C2CD4B genes on chromosome 15q are associated with impaired fasting glucose and increased risk of type 2 diabetes. eQTL analysis revealed an association between possession of risk (C) alleles at a previously implicated causal SNP, rs7163757, and lowered VPS13C and C2CD4A levels in islets from female (n = 40, P < 0.041) but not from male subjects. Explored using promoter-reporter assays in β-cells and other cell lines, the risk variant at rs7163757 lowered enhancer activity. Mice deleted for Vps13c selectively in the β-cell were generated by crossing animals bearing a floxed allele at exon 1 to mice expressing Cre recombinase under Ins1 promoter control (Ins1Cre). Whereas Vps13c(fl/fl):Ins1Cre (βVps13cKO) mice displayed normal weight gain compared with control littermates, deletion of Vps13c had little effect on glucose tolerance. Pancreatic histology revealed no significant change in β-cell mass in KO mice vs. controls, and glucose-stimulated insulin secretion from isolated islets was not altered in vitro between control and βVps13cKO mice. However, a tendency was observed in female null mice for lower insulin levels and β-cell function (HOMA-B) in vivo. Furthermore, glucose-stimulated increases in intracellular free Ca(2+) were significantly increased in islets from female KO mice, suggesting impaired Ca(2+) sensitivity of the secretory machinery. The present data thus provide evidence for a limited role for changes in VPS13C expression in conferring altered disease risk at this locus, particularly in females, and suggest that C2CD4A may also be involved.
Collapse
Affiliation(s)
- Zenobia B Mehta
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Nicholas Fine
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Timothy J Pullen
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Matthew C Cane
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Ming Hu
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Pauline Chabosseau
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | - Gargi Meur
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom
| | | | - Anthony P Monaco
- Wellcome Trust Centre for Human Genetics, Oxford, United Kingdom; and
| | - Lorella Marselli
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Piero Marchetti
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Guy A Rutter
- Section of Cell Biology and Functional Genomics, Imperial College London, London, United Kingdom;
| |
Collapse
|
9
|
Prudente S, Bailetti D, Mendonca C, Mannino GC, Fontana A, Andreozzi F, Hastings T, Mercuri L, Alberico F, Basile G, Copetti M, Sesti G, Doria A, Trischitta V. Infrequent TRIB3 coding variants and coronary artery disease in type 2 diabetes. Atherosclerosis 2015; 242:334-9. [PMID: 26253791 DOI: 10.1016/j.atherosclerosis.2015.07.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/26/2015] [Accepted: 07/15/2015] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Genes that modulate insulin sensitivity may also be involved in shaping the risk of coronary artery disease (CAD). The relatively common TRIB3 Q84R polymorphism (rs2295490) has been associated with abnormal insulin signaling, endothelial dysfunction, insulin resistance, and pro-atherogenic phenotypes. The aim of our study was to investigate the association between low-frequency TRIB3 coding variants and CAD in patients with type 2 diabetes (T2D). METHODS Three case-control studies for CAD from Italy and US were analyzed, for a total of 1565 individuals, all with type 2 diabetes. Infrequent variants were identified by re-sequencing TRIB3 exons in 140 "extreme cases" and 140 "super-controls" and then genotyped in all study subjects. RESULTS TRIB3 infrequent variants (n = 8), considered according to a collapsing rare variants framework, were significantly associated with CAD in diabetic patients from Italy (n = 700, OR = 0.43, 95% CI 0.20-0.91; p = 0.027), but not from the US (n = 865, OR = 1.22, 95% CI 0.69-2.18; p = 0.49). In the Italian sets, the association was especially strong among individuals who also carried the common R84 variant. CONCLUSION Although preliminary, our finding suggests a role of TRIB3 low-frequency variants on CAD among Italian patients with T2D. Further studies are needed to address the role of TRIB3 infrequent variants in other populations of both European and non-European ancestries.
Collapse
Affiliation(s)
- Sabrina Prudente
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy.
| | - Diego Bailetti
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, Rome, Italy
| | | | - Gaia Chiara Mannino
- Research Division, Joslin Diabetes Center, Boston, MA, USA; Department of Medical and Surgical Sciences, University Magna Græcia, Catanzaro, Italy
| | - Andrea Fontana
- IRCCS Casa Sollievo della Sofferenza, Unit of Biostatistics, San Giovanni Rotondo, Italy
| | - Francesco Andreozzi
- Department of Medical and Surgical Sciences, University Magna Græcia, Catanzaro, Italy
| | | | - Luana Mercuri
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy
| | - Federica Alberico
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy
| | - Giorgio Basile
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Massimiliano Copetti
- IRCCS Casa Sollievo della Sofferenza, Unit of Biostatistics, San Giovanni Rotondo, Italy
| | - Giorgio Sesti
- Department of Medical and Surgical Sciences, University Magna Græcia, Catanzaro, Italy
| | - Alessandro Doria
- Research Division, Joslin Diabetes Center, Boston, MA, USA; Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Vincenzo Trischitta
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, Rome, Italy; IRCSS Casa Sollievo della Sofferenza, Research Unit of Diabetes and Endocrine Diseases, San Giovanni Rotondo, Italy.
| |
Collapse
|
10
|
Prudente S, Jungtrakoon P, Marucci A, Ludovico O, Buranasupkajorn P, Mazza T, Hastings T, Milano T, Morini E, Mercuri L, Bailetti D, Mendonca C, Alberico F, Basile G, Romani M, Miccinilli E, Pizzuti A, Carella M, Barbetti F, Pascarella S, Marchetti P, Trischitta V, Di Paola R, Doria A. Loss-of-Function Mutations in APPL1 in Familial Diabetes Mellitus. Am J Hum Genet 2015; 97:177-85. [PMID: 26073777 DOI: 10.1016/j.ajhg.2015.05.011] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 05/14/2015] [Indexed: 12/29/2022] Open
Abstract
Diabetes mellitus is a highly heterogeneous disorder encompassing several distinct forms with different clinical manifestations including a wide spectrum of age at onset. Despite many advances, the causal genetic defect remains unknown for many subtypes of the disease, including some of those forms with an apparent Mendelian mode of inheritance. Here we report two loss-of-function mutations (c.1655T>A [p.Leu552(∗)] and c.280G>A [p.Asp94Asn]) in the gene for the Adaptor Protein, Phosphotyrosine Interaction, PH domain, and leucine zipper containing 1 (APPL1) that were identified by means of whole-exome sequencing in two large families with a high prevalence of diabetes not due to mutations in known genes involved in maturity onset diabetes of the young (MODY). APPL1 binds to AKT2, a key molecule in the insulin signaling pathway, thereby enhancing insulin-induced AKT2 activation and downstream signaling leading to insulin action and secretion. Both mutations cause APPL1 loss of function. The p.Leu552(∗) alteration totally abolishes APPL1 protein expression in HepG2 transfected cells and the p.Asp94Asn alteration causes significant reduction in the enhancement of the insulin-stimulated AKT2 and GSK3β phosphorylation that is observed after wild-type APPL1 transfection. These findings-linking APPL1 mutations to familial forms of diabetes-reaffirm the critical role of APPL1 in glucose homeostasis.
Collapse
Affiliation(s)
- Sabrina Prudente
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy.
| | - Prapaporn Jungtrakoon
- Research Division, Joslin Diabetes Center, Boston, MA 02215, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Antonella Marucci
- Research Unit of Diabetes and Endocrine Diseases, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Ornella Ludovico
- Research Unit of Diabetes and Endocrine Diseases, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Patinut Buranasupkajorn
- Research Division, Joslin Diabetes Center, Boston, MA 02215, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Tommaso Mazza
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Timothy Hastings
- Research Division, Joslin Diabetes Center, Boston, MA 02215, USA
| | - Teresa Milano
- Department of Biochemical Sciences, Sapienza University, 00185 Rome, Italy
| | - Eleonora Morini
- Research Unit of Diabetes and Endocrine Diseases, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Luana Mercuri
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Diego Bailetti
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy
| | | | - Federica Alberico
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Giorgio Basile
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy
| | - Marta Romani
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Elide Miccinilli
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Antonio Pizzuti
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy
| | - Massimo Carella
- Unit of Medical Genetics, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Fabrizio Barbetti
- Laboratory of Mendelian Diabetes, Bambino Gesù Childrens' Hospital, 00165 Rome, Italy; Department of Experimental Medicine and Surgery, University of Tor Vergata, 00133 Rome, Italy
| | - Stefano Pascarella
- Department of Biochemical Sciences, Sapienza University, 00185 Rome, Italy
| | - Piero Marchetti
- Department of Clinical and Experimental Medicine, University of Pisa, 56127 Pisa, Italy
| | - Vincenzo Trischitta
- Mendel Laboratory, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy; Research Unit of Diabetes and Endocrine Diseases, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University, 00161 Rome, Italy
| | - Rosa Di Paola
- Research Unit of Diabetes and Endocrine Diseases, IRCCS Casa Sollievo della Sofferenza, 71013 San Giovanni Rotondo, Italy
| | - Alessandro Doria
- Research Division, Joslin Diabetes Center, Boston, MA 02215, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
| |
Collapse
|
11
|
Zhang W, Yang Z, Li X, Wen J, Zhang H, Wang S, Wang X, Zhou H, Fang W, Qin L, Su Q. The functional Q84R polymorphism of TRIB3 gene is associated with diabetic nephropathy in Chinese type 2 diabetic patients. Gene 2014; 555:357-61. [PMID: 25447894 DOI: 10.1016/j.gene.2014.11.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 10/03/2014] [Accepted: 11/13/2014] [Indexed: 12/11/2022]
Abstract
Increased oxidative stress and circulating free fatty acids (FFA) has been suggested to involve in the pathogenesis of diabetic nephropathy. TRIB3 can inhibit FFA and reactive oxygen species (ROS) stimulated podocyte production of MCP-1. Smoking increases the production of reactive oxygen species, which accelerates oxidative stress under hyperglycemia. To determine whether the Q84R polymorphism (rs2295490), alone or in combination with smoking, contributes to the development of diabetic nephropathy, a case-control study was performed in 812 Chinese patients with type 2 diabetes. Among patients, 214 had diabetic nephropathy with microalbuminuria (n=156) or overt albuminuria (n=58), and 598 did not show either of these symptoms but had diabetes for ≥10 years and were not undergoing antihypertension treatment. After adjustment for confounders, TRIB3 single-nucleotide polymorphism rs2295490 was associated with DN (OR 1.318, 95% CI 1.075, 1.653, p=0.017); smoking was also an independent risk factor for diabetic nephropathy (1.42 [1.25-2.04], p<0.001). In addition, we identified possible synergistic effects; i.e., the high-risk group (smokers with the AG+GG genotype) showed 2.13 times higher risk (1.51-3.96, p<0.001) of diabetic nephropathy than the low-risk group (nonsmokers with the AA genotype) in a multiple logistic regression analysis controlled for the confounders, but no departure from additivity was found. Our results indicate that smoking and the TRIB3 G-allele is associated with an increased risk of diabetic nephropathy, which supports the hypothesis that oxidative stress contributes to the development of diabetic nephropathy.
Collapse
Affiliation(s)
- Weiwei Zhang
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Zhen Yang
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Xiaoyong Li
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Jie Wen
- Institute of Endocrinology and Diabetology at Fudan University, Huashan Hospital, Fudan University, Shanghai, China
| | - Hongmei Zhang
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Suijun Wang
- Department of Endocrinology, Clinical Geriatric Medicine, Henan Provincial People's Hospital, Zhengzhou, China
| | - Xuanchun Wang
- Institute of Endocrinology and Diabetology at Fudan University, Huashan Hospital, Fudan University, Shanghai, China
| | - Houguang Zhou
- Department of Geriatrics, Huashan Hospital, Fudan University, Shanghai, China
| | - Wenjun Fang
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Li Qin
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Qing Su
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.
| |
Collapse
|
12
|
Menzaghi C, Fontana A, Copetti M, Rizza S, Spoto B, Buranasupkajorn P, Tripepi G, Marucci A, Bailetti D, Hastings T, Testa A, Mendonca C, Mallamaci F, De Cosmo S, Bacci S, Federici M, Doria A, Zoccali C, Trischitta V. Joint effect of insulin signaling genes on all-cause mortality. Atherosclerosis 2014; 237:639-44. [PMID: 25463099 DOI: 10.1016/j.atherosclerosis.2014.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/10/2014] [Accepted: 10/11/2014] [Indexed: 02/03/2023]
Abstract
OBJECTIVE We have previously reported the combined effect of SNPs perturbing insulin signaling (ENPP1 K121Q, rs1044498; IRS1 G972R, rs1801278; TRIB3 Q84R, rs2295490) on insulin resistance (IR), type 2 diabetes (T2D) and cardiovascular events. We here investigated whether such a combined effect affects also all-cause mortality in a sample of 1851 Whites of European ancestry. METHODS We investigated a first sample of 721 patients, 232 deaths, 3389 person-years (py). Replication was assessed in two samples of patients with T2D: the Gargano Mortality Study (GMS) of 714 patients, 127 deaths, 5426 py and the Joslin Kidney Study (JKS) comprising 416 patients, 214 deaths, 5325 py. RESULTS In the first sample, individuals carrying 1 or ≥ 2 risk alleles had 33% (p = 0.06) and 51% (p = 0.02) increased risk of mortality, as compared with individuals with no risk alleles. A similar, though not significant, trend was obtained in the two replication samples only for subject carrying ≥ 2 risk alleles. In a pooled analysis, individuals carrying ≥ 2 risk alleles had higher mortality rate as compared to those carrying 0 risk alleles (HR = 1.34, 95%CI = 1.08-1.67; p = 0.008), and as compared to those carrying only one risk allele (HR = 1.41, 95%CI = 1.13-1.75; p = 0.002). This association was independent from several possible confounders including sex, age, BMI, hypertension and diabetes status. CONCLUSION Our data suggest that variants affecting insulin signaling exert a joint effect on all-cause mortality and is consistent with a role of abnormal insulin signaling on mortality risk.
Collapse
Affiliation(s)
- Claudia Menzaghi
- Research Unit of Diabetes and Endocrine Diseases IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy.
| | - Andrea Fontana
- Unit of Biostatistics IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Massimiliano Copetti
- Unit of Biostatistics IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Stefano Rizza
- Department of Internal Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Belinda Spoto
- CNR-IBIM, Research Unit of Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension, Reggio Calabria, Italy
| | - Patinut Buranasupkajorn
- Research Division, Joslin Diabetes Center, Boston, MA, USA; Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Giovanni Tripepi
- CNR-IBIM, Research Unit of Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension, Reggio Calabria, Italy
| | - Antonella Marucci
- Research Unit of Diabetes and Endocrine Diseases IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Diego Bailetti
- IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, Rome, Italy; Department of Experimental Medicine, Sapienza University of Rome, Italy
| | | | - Alessandra Testa
- CNR-IBIM, Research Unit of Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension, Reggio Calabria, Italy
| | | | - Francesca Mallamaci
- CNR-IBIM, Research Unit of Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension, Reggio Calabria, Italy
| | - Salvatore De Cosmo
- Unit of Endocrinology, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Simonetta Bacci
- Unit of Endocrinology, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
| | - Massimo Federici
- Department of Internal Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Alessandro Doria
- Research Division, Joslin Diabetes Center, Boston, MA, USA; Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Carmine Zoccali
- CNR-IBIM, Research Unit of Clinical Epidemiology and Physiopathology of Renal Disease and Hypertension, Reggio Calabria, Italy
| | - Vincenzo Trischitta
- Research Unit of Diabetes and Endocrine Diseases IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University of Rome, Italy.
| |
Collapse
|
13
|
Das R, Sebo Z, Pence L, Dobens LL. Drosophila tribbles antagonizes insulin signaling-mediated growth and metabolism via interactions with Akt kinase. PLoS One 2014; 9:e109530. [PMID: 25329475 PMCID: PMC4198113 DOI: 10.1371/journal.pone.0109530] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 09/09/2014] [Indexed: 12/30/2022] Open
Abstract
Drosophila Tribbles (Trbl) is the founding member of the Trib family of kinase-like docking proteins that modulate cell signaling during proliferation, migration and growth. In a wing misexpression screen for Trbl interacting proteins, we identified the Ser/Thr protein kinase Akt1. Given the central role of Akt1 in insulin signaling, we tested the function of Trbl in larval fat body, a tissue where rapid increases in size are exquisitely sensitive to insulin/insulin-like growth factor levels. Consistent with a role in antagonizing insulin-mediated growth, trbl RNAi knockdown in the fat body increased cell size, advanced the timing of pupation and increased levels of circulating triglyceride. Complementarily, overexpression of Trbl reduced fat body cell size, decreased overall larval size, delayed maturation and lowered levels of triglycerides, while circulating glucose levels increased. The conserved Trbl kinase domain is required for function in vivo and for interaction with Akt in a yeast two-hybrid assay. Consistent with direct regulation of Akt, overexpression of Trbl in the fat body decreased levels of activated Akt (pSer505-Akt) while misexpression of trbl RNAi increased phospho-Akt levels, and neither treatment affected total Akt levels. Trbl misexpression effectively suppressed Akt-mediated wing and muscle cell size increases and reduced phosphorylation of the Akt target FoxO (pSer256-FoxO). Taken together, these data show that Drosophila Trbl has a conserved role to bind Akt and block Akt-mediated insulin signaling, and implicate Trib proteins as novel sites of signaling pathway integration that link nutrient availability with cell growth and proliferation.
Collapse
Affiliation(s)
- Rahul Das
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri, United States of America
| | - Zachary Sebo
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri, United States of America
| | - Laramie Pence
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri, United States of America
| | - Leonard L. Dobens
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri, United States of America
- * E-mail:
| |
Collapse
|
14
|
De Cosmo S, Prudente S, Lamacchia O, Pucci L, Lucchesi D, Mendonca C, Bailetti D, Copetti M, Pellegrini F, Cignarelli M, Penno G, Doria A, Trischitta V. The IRS1 G972R polymorphism and glomerular filtration rate in patients with type 2 diabetes of European ancestry. Nephrol Dial Transplant 2013; 28:3031-4. [PMID: 24071662 DOI: 10.1093/ndt/gft325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND In Mexican Americans, the IRS1 G972R polymorphism (rs1801278) has been associated to such a marked reduction in glomerular filtration rate (GFR) (i.e. β = -8.3 mL/min/1.73 m(2)) to be considered a major determinant of kidney function. METHODS This was a cross-sectional study to investigate whether a similarly strong effect can also be observed among individuals of European ancestry. We investigated a total of 3973 White patients with type 2 diabetes. Standardized serum creatinine was measured by the modified kinetic Jaffè reaction and estimated GFR (eGFR) calculated by the modification diet renal disease (MDRD) formula; rs1801278 was genotyped by TaqMan assay. RESULTS No significant association was observed, with R972 carriers showing only a modestly, not significant, lower eGFR level as compared with other subjects (β = -1.82 mL/min/1.73 m(2), P = 0.086). CONCLUSIONS Our data indicate that IRS1 G972R is not a strong determinant of GFR in diabetic patients of European ancestry as in Mexican Americans. Since we had 100% power to detect the previously reported association, the risk our finding is a false negative one is minimal.
Collapse
Affiliation(s)
- Salvatore De Cosmo
- IRCCS Casa Sollievo della Sofferenza, Clinical Unit of Endocrinology, San Giovanni Rotondo, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|