Ras is involved in gap junction closure in proliferating fibroblasts or preadipocytes but not in differentiated adipocytes.

Abstract:

:A decrease in gap junctional, intercellular communication (GJIC) has been associated with cells neoplastically transformed by a variety of factors. To investigate the role of the Ras oncogene product in gap junction function, a panel of murine C3H10T1/2 (10T1/2) fibroblasts was constructed in which the levels of ras gene expression could be effectively up- or down-regulated. Intercellular communication was measured using a novel technique of in situ electroporation of adherent cells on a partly conductive slide. The introduction of increasing amounts of activated Ras(leu61) in mouse 10T1/2 fibroblasts proportionally reduced GJIC, while the downregulation of endogenous c-ras gene expression increased junctional permeability. These results indicate that Ras plays an important role in the junction closure pathway leading to the proliferation of normal cells. However, differentiation of c-Ras-deficient preadipocytes entirely abolished their initially extensive GJIC, indicating that junction closure in response to adipocytic differentiation is independent of Ras.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

Brownell HL,Narsimhan RP,Corbley MJ,Mann VM,Whitfield JF,Raptis L

doi

10.1089/dna.1996.15.443

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

443-51

issue

6

eissn

1044-5498

issn

1557-7430

journal_volume

15

pub_type

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