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Cell Growth & Differentiation, Vol 3, Issue 1 21-30, Copyright © 1992 by American Association of Cancer Research


ARTICLES

Molecular cloning of a differentiation-related mRNA in the adipogenic cell line 1246

HP Jiang, SE Harris and G Serrero
W. Alton Jones Cell Science Center, Inc., Lake Placid, New York 12946-1099.

The 1246 cell line is a C3H mouse teratoma-derived adipogenic cell line that can proliferate and differentiate in defined medium. We have constructed a recombinant phage library containing complementary DNAs (cDNAs) prepared from mRNA of differentiated 1246 cells. This library was screened using a differential hybridization technique. We have isolated five different cDNA clones corresponding to mRNAs that are induced during adipogenesis of 1246 cells and one cDNA clone corresponding to mRNA that is decreased during adipogenesis. Among the mRNAs expressed during adipose differentiation, some are not expressed in undifferentiated cells, whereas some are expressed at very low levels under these conditions. Moreover, the level of induction during differentiation and the temporal expression of the mRNAs corresponding to these cDNAs varied. Our results indicate that one of the cDNA clones isolated, called 154, which selects a 2.2-kilobase mRNA, was induced 100-fold at a very early time during the onset of the differentiation program in 1246 cells and also in adipocyte precursors in primary culture. Direct sequencing of 154 cDNA insert revealed no homology with sequences in GenBank and PIR protein databases. The expression of 154 mRNA was stimulated by accelerators of differentiation such as dexamethasone and isobutylmethylxanthine and inhibited by tumor necrosis factor alpha, transforming growth factor beta, and epidermal growth factor, which are known inhibitors of 1246 cell differentiation. In addition, 154 mRNA level in adipocytes was down-regulated by tumor necrosis factor alpha, but not by transforming growth factor beta or epidermal growth factor. These results suggest that the increase in 154 mRNA expression is related to the onset of adipose differentiation. Further analysis of this clone should allow characterization of a novel protein induced early during the process of differentiation.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1992 by the American Association of Cancer Research.