Prolactin enhances cell-to-cell communication among beta-cells in pancreatic islets.

Abstract:

:To determine the role of prolactin in increasing junctional communication among islet beta-cells, we studied dye coupling in pancreatic islets exposed to elevated levels of prolactin in vivo and in vitro. Islets were isolated from rats immediately after lactation or from rats bearing mammosomatotropic tumors (MtTW15), conditions involving high levels of prolactin (either 5-fold or 1000-fold control levels, respectively). When beta-cells were microinjected with the gap junction permeant dye Lucifer yellow CH, the mean number of dye-coupled cells per injection was approximately 10-fold greater than in islets from virgin control rats. As a more direct test of the effects of prolactin on beta-cell coupling, islets isolated from virgin rats were treated for 90 min with 500 ng/ml rat prolactin in the presence of low glucose (2.8 mM) and were microinjected with dye. The mean number of dye-coupled cells per injection increased by 6.7-fold over controls with low glucose, demonstrating a direct effect of prolactin on beta-cell coupling. In vitro treatment with high glucose (16.7 mM) resulted in a 2.7-fold increase in dye-coupled cells per injection. We discuss the possible relationship between the effects of glucose and of prolactin on coupling.

journal_name

Diabetes

journal_title

Diabetes

authors

Michaels RL,Sorenson RL,Parsons JA,Sheridan JD

doi

10.2337/diab.36.10.1098

subject

Has Abstract

pub_date

1987-10-01 00:00:00

pages

1098-103

issue

10

eissn

0012-1797

issn

1939-327X

journal_volume

36

pub_type

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