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Best Pract Res Clin Endocrinol Metab. 2015 Dec;29(6):859-71. doi: 10.1016/j.beem.2015.10.002. Epub 2015 Oct 8.

Evolving function and potential of pancreatic alpha cells.

Author information

1
Laboratory of Molecular Endocrinology, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
2
Laboratory of Molecular Endocrinology, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA. Electronic address: jhabener@mgh.harvard.edu.

Abstract

The alpha cells that co-occupy the islets in association with beta cells have been long recognized as the source of glucagon, a hyperglycemia-producing and diabetogenic hormone. Although the mechanisms that control the functions of alpha cells, glucagon secretion, and the role of glucagon in diabetes have remained somewhat enigmatic over the fifty years since their discovery, seminal findings during the past few years have moved alpha cells into the spotlight of scientific discovery. These findings obtained largely from studies in mice are: Alpha cells have the capacity to trans-differentiate into insulin-producing beta cells. Alpha cells contain a GLP-1 generating system that produces GLP-1 locally for paracrine actions within the islets that likely promotes beta cell growth and survival and maintains beta cell mass. Impairment of glucagon signaling both prevents the occurrence of diabetes in conditions of the near absence of insulin and expands alpha cell mass. Alpha cells appear to serve as helper cells or guardians of beta cells to ensure their health and well-being. Of potential relevance to the possibility of promoting the transformation of alpha to beta cells is the observation that impairment of glucagon signaling leads to a marked increase in alpha cell mass in the islets. Such alpha cell hyperplasia provides an increased supply of alpha cells for their transdifferentiation into new beta cells. In this review we discuss these recent discoveries from the perspective of their potential relevance to the treatment of diabetes.

KEYWORDS:

GLP-1; alpha cells; beta cells; diabetes; proglucagon; transdifferentiation

PMID:
26696515
PMCID:
PMC4690008
DOI:
10.1016/j.beem.2015.10.002
[Indexed for MEDLINE]
Free PMC Article

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