Cx36 preferentially connects beta-cells within pancreatic islets.

Abstract:

:Previous studies have provided evidence for the transcripts of Cx43 and Cx45 within pancreatic islets. As of yet, however, it has proven difficult to unambiguously demonstrate the expression of these proteins by islet cells. We have investigated whether Cx36, a new connexin species recently identified in mammalian brain and retina, may also be expressed in pancreatic islets. Using probes that permitted the original identification of Cx36 in the central nervous system, we show that a transcript for Cx36 is clearly detectable in rat pancreatic islets. Using novel and affinity-purified polyclonal antibodies, we have found that Cx36 is actually expressed in pancreatic islets. Both in situ hybridization and immunolabeling indicated that this connexin is abundant in the centrally located insulin-producing beta-cells and is expressed much less, if at all, by the other endocrine cell types. This differential expression was further confirmed on fluorescence-activated cell sorter-purified preparations enriched in either beta- or non-beta-cells. The finding of a differential distribution of Cx36 within distinct regions of pancreatic islets creates the possibility that this connexin may provide the establishment of selective pathways of communication between the different types of endocrine cells comprising the pancreatic islet.

journal_name

Diabetes

journal_title

Diabetes

authors

Serre-Beinier V,Le Gurun S,Belluardo N,Trovato-Salinaro A,Charollais A,Haefliger JA,Condorelli DF,Meda P

doi

10.2337/diabetes.49.5.727

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

727-34

issue

5

eissn

0012-1797

issn

1939-327X

journal_volume

49

pub_type

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