1
|
Mezza T, Moffa S, Ferraro PM, Quero G, Capece U, Carfì A, Cefalo CMA, Cinti F, Sorice GP, Impronta F, Mari A, Pontecorvi A, Alfieri S, Holst JJ, Giaccari A. Bile Modulates Secretion of Incretins and Insulin: A Study of Human Extrahepatic Cholestasis. J Clin Endocrinol Metab 2019; 104:2685-2694. [PMID: 30874733 DOI: 10.1210/jc.2018-02804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Accepted: 03/11/2019] [Indexed: 02/09/2023]
Abstract
OBJECTIVE Changes in bile flow after bariatric surgery may beneficially modulate secretion of insulin and incretins, leading to diabetes remission. However, the exact mechanism(s) involved is still unclear. Here, we propose an alternative method to investigate the relationship between alterations in physiological bile flow and insulin and incretin secretion by studying changes in gut-pancreatic function in extrahepatic cholestasis in nondiabetic humans. METHODS To pursue this aim, 58 nondiabetic patients with recent diagnosis of periampullary tumors underwent an oral glucose tolerance test (OGTT), and a subgroup of 16 patients also underwent 4-hour mixed meal tests and hyperinsulinemic-euglycemic clamps. RESULTS The analysis of the entire cohort revealed a strong inverse correlation between total bilirubin levels and insulinogenic index. When subjects were divided on the basis of bilirubin levels, used as a marker of altered bile flow, subjects with high bilirubin levels displayed inferior glucose control and decreased insulin secretion during the OGTT. Altered bile flow elicited a markedly greater increase in glucagon and glucagon-like peptide 1 (GLP-1) secretion at fasting state, and following the meal, both glucagon and GLP-1 levels remained increased over time. Conversely, Glucose-dependent insulinotropic polypeptide (GIP) levels were comparable at the fasting state, whereas the increase following meal ingestion was significantly blunted with high bilirubin levels. We reveal strong correlations between total bilirubin and glucagon and GLP-1 levels. CONCLUSIONS Our findings suggest that acute extrahepatic cholestasis determines major impairment in enteroendocrine gut-pancreatic secretory function. The altered bile flow may determine a direct deleterious effect on β-cell function, perhaps mediated by the impairment of incretin hormone function.
Collapse
Affiliation(s)
- Teresa Mezza
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Simona Moffa
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Pietro Manuel Ferraro
- U.O.C., Nefrologia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
- Istituto di Medicina Interna e Geriatria, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Giuseppe Quero
- U.O.C., Chirurgia Digestiva, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
- U.O.C., Istituto di Semeiotica Chirurgica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Umberto Capece
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Andrea Carfì
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Chiara M A Cefalo
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Francesca Cinti
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Gian Pio Sorice
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Flavia Impronta
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Andrea Mari
- U.O.C., Institute of Neuroscience, National Research Council, Padua, Italy
| | - Alfredo Pontecorvi
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Sergio Alfieri
- U.O.C., Chirurgia Digestiva, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
- U.O.C., Istituto di Semeiotica Chirurgica, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Jens J Holst
- NNF Center for Basic Metabolic Research and Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Andrea Giaccari
- U.O.C., Endocrinologia e Diabetologia, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- Istituto Patologia Speciale Medica, Università Cattolica del Sacro Cuore, Rome, Italy
| |
Collapse
|
2
|
Glucagon-like peptide-1 and its receptor agonist exendin-4 modulate cholangiocyte adaptive response to cholestasis. Gastroenterology 2007; 133:244-55. [PMID: 17631146 DOI: 10.1053/j.gastro.2007.04.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Accepted: 03/22/2007] [Indexed: 01/22/2023]
Abstract
BACKGROUND & AIMS Cholangiopathies are characterized by progressive dysregulation of the balance between proliferation and death of cholangiocytes. In the course of cholestasis, cholangiocytes undergo a neuroendocrine transdifferentiation and their biology is regulated by neuroendocrine hormones. Glucagon-like peptide-1 (GLP-1), secreted by neuroendocrine cells, sustains beta-cell survival in experimental diabetes and induces the neuroendocrine transdifferentiation of pancreatic ductal cells. GLP-1 receptor (GLP-1R) selective agonist exendin-4 is used in humans as a novel therapeutic tool for diabetes. The aim of this study was to define if GLP-1 modulates cholangiocyte biologic response to cholestasis. METHODS Expression of GLP-1R in cholangiocytes was determined. Effects on cholangiocyte proliferation of the in vitro and in vivo exposure to GLP-1 or exendin-4, together with the intracellular signals, were then studied. Synthesis of GLP-1 by cholangiocytes and the effects of GLP-1R blockage on their growth were also determined. RESULTS Cholangiocytes express the GLP-1 receptor, which is up-regulated in the course of cholestasis. GLP-1 and exendin-4 increase cholangiocyte growth both in vitro and in vivo. The GLP-1R signal is mediated by the phosphatidyl-inositol-3-kinase, cAMP/Protein Kinase A, and Ca(2+)-CamKIIalpha but not by the ERK1/2 and PKCalpha pathways. Proliferating cholangiocytes synthesize GLP-1: neutralization of its action by GLP-1R antagonist blunts cholangiocyte response to cholestasis. CONCLUSIONS GLP-1 is required for the cholangiocyte adaptive response to cholestasis. Cholangiocytes are susceptible to the activation of GLP-1R and respond with increased proliferation and functional activity. Exendin-4 availability for employment in humans and these data may open novel perspectives for the medical treatment of cholangiopathies.
Collapse
|