Overexpression of Raidd cDNA inhibits differentiation of mouse preadipocytes |
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Authors: | Felmer R Horvat S Clinton M Clark A J |
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Affiliation: | Division of Gene Expression and Development, Roslin Institute, Roslin, Midlothian, Scotland, UK and;University of Ljubljana, Biotechnical Faculty, Zootechnical Departement, Domzale, Slovenia;The present address of R. Felmer is: National Institute for Agricultural Research (INIA), CRI-Carillanca, PO-Box 58-D, Temuco, Chile. |
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Abstract: | Abstract. RAIDD (RIP-associated ICH-1 homologous protein with a death domain) is an adaptor molecule that mediates the action of cysteine proteases involved in apoptosis. To study the possibility of a novel system of cell ablation mediated by RAIDD, a preadipocyte cell line (3T3L1) was stably transfected with a plasmid containing the murine Raidd cDNA under the control of the adipocyte specific promoter aP2. Instead of the expected apoptosis, a blockage to differentiation upon hormonal induction was observed as judged by an absence of lipid accumulation, a lack of expression of adipocyte-specific genes and a fibroblastic appearance. Proliferation rate of Raidd -transfected clones remained unaffected. Overexpression of Raidd cDNA in 3T3L1 cell therefore inhibited differentiation, suggesting that Raidd plays a role in controlling differentiation of mouse preadipocytes and, perhaps, in other cell types, in addition to its established role in apoptosis. |
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