Abstract
The major type of collagen synthesized by fibroblasts or bone cells, type I collagen, consists of two chains normally found in a 2:1 ratio designated alpha 1(I)2 alpha 2(I) or more simply alpha 1(I)2 alpha 2. I have analyzed the relative synthesis of type I chains in these cells under conditions which reduce the initiation of protein synthesis. It was found that in bone cells, which make a large amount of collagen, the alpha 1(I):alpha 2 ratio is unaltered whereas in fibroblasts, which make smaller amounts of collagen, the alpha 2 chain is particularly sensitive to these same conditions. Examination of the collagen secreted into the medium, under these same conditions, also revealed an altered chain ratio from cells making low amounts of collagen.
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