Abstract:
:Retinoic acid reduces the growth rate of mouse S91 melanoma cells in culture and increases the proportion of cells in the G1 phase of the cell cycle. Because of the integral role protein synthesis has been shown to play in growth control we studied the effect of retinoic acid on the protein synthesis machinery with a cell-free system developed from the melanoma cells. This system was capable of translating endogenous mRNA, exogenous globin mRNA, and the synthetic template poly(U). Of the above activities of the protein synthesis system only the translation of endogenous mRNA was reduced significantly in the cell-free system prepared from retinoic acid-treated cells. Analyses of the amount and function of RNA revealed that treatment with retinoic acid leads to reductions in total RNA content, in the proportion of ribosomes in polysomes, in the amount of poly(A)RNA, and in the amount of polysome-associated mRNA. All these effects of retinoic acid contribute to the decrease in protein synthesis activity of treated cells. Two-dimensional electrophoresis analysis of L-[35S]methionine-labeled proteins produced by untreated and treated cells revealed only a few quantitative differences. We suggest that retinoic acid-induced suppression of protein synthesis activity may be the cause for growth inhibition.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Lotan R,Fischer I,Meromsky L,Moldave Kdoi
10.1002/jcp.1041130110subject
Has Abstractpub_date
1982-10-01 00:00:00pages
47-55issue
1eissn
0021-9541issn
1097-4652journal_volume
113pub_type
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