Synergistic endocrine induction by GLP-1 and TGF-beta in the developing pancreas.

Abstract:

OBJECTIVES:Glucagon-like peptide-1 (GLP-1) is known to stimulate glucose-dependent insulin production and secretion by pancreatic beta-cells. Preliminary evidence suggests that GLP-1 may also influence endocrine differentiation from pancreatic progenitor cells. Additionally, TGF-beta signaling can also control endocrine differentiation by both inhibiting proliferation and enhancing differentiation of endocrine progenitor cells to become mature beta-cells. Here we document synergy of these two signaling pathways in the differentiation of endocrine cells in the developing pancreas. METHODS:Embryonic pancreas was harvested from mice at day 11.5 and cultured for six days with GLP-1 agonist, exendin-4, and/or TGF-beta1 ligand. Also, a pan-neutralizing TGF-beta isoform antibody was used alone or with exendin-4 to study TGF-beta inhibition in this system. Pancreatic cultures were processed for immunohistochemistry. RESULTS:Exogenous TGF-beta1 and exendin-4 each individually enhanced both insulin and glucagon differentiation dose-dependently. However, when combined there was an additive effect to a 4.5-fold increase in insulin-positive differentiation. We also saw suppression of amylase-positive differentiation. Surprisingly, TGF-beta pan-neutralizing antibody also gave an augmentation of endocrine differentiation by 1.5 to 2-fold, but no synergistic effect was seen with exendin-4. CONCLUSION:We conclude that TGF-beta isoforms have a specific synergistic role with GLP-1 pathway signaling in early pancreatic development, toward endocrine differentiation and away from acinar differentiation.

journal_name

Pancreas

journal_title

Pancreas

authors

Tei E,Mehta S,Tulachan SS,Yew H,Hembree M,Preuett B,Snyder CL,Yamataka A,Miyano T,Gittes GK

doi

10.1097/01.mpa.0000172566.70619.58

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

138-41

issue

2

eissn

0885-3177

issn

1536-4828

pii

00006676-200508000-00006

journal_volume

31

pub_type

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