3T3-L1 preadipocyte differentiation and poly(ADP-ribose) synthetase.

Abstract:

:Differentiation of 3T3-L1 preadipocytes, induced by methyl-isobutylxanthine (MIX), dexamethasone (DEX), and insulin, results in cells with the morphological and biochemical characteristics of adipocytes. Following incubation of 3T3-L1 cells with MIX, DEX, and insulin, poly(ADP-ribose) synthetase activity decreased abruptly, remained low for several hours and then increased; this rise was delayed by readdition of MIX, DEX, and insulin. The transient reduction in poly(ADP-ribose) synthetase activity in 3T3-L1 cells occurred prior to the appearance of the adipocyte phenotype induced by the above agents. It was not observed when preparations were assayed in the presence of DNase I, indicating that poly(ADP-ribose) synthetase activity was masked following treatment with MIX, DEX, and insulin. The change in synthetase activity represents the earliest alteration of a specific enzyme yet detected during the differentiation of 3T3-L1 cells. It appears to be differentiation specific since nondifferentiating 3T3-C2 control cells did not exhibit changes in poly(ADP-ribose) synthetase activity when treated with MIX, DEX, and insulin. The transient reduction in activity may be an early event in differentiation which reflects changes in chromatin structure.

journal_name

Mol Cell Biochem

authors

Pekala PH,Moss J

doi

10.1007/BF00225255

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

221-32

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

53-54

pub_type

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