Uterine protein synthesis during the early stages of pregnancy in the rat

in Reproduction

Summary. The synthesis of uterine-soluble proteins during early pregnancy in the rat has been examined by means of dual-isotope labelling techniques and subsequent electrophoretic analysis. A protein of similar electrophoretic mobility to the uterine oestrogen-induced protein was observed, and synthesis of this 'presumptive induced protein' was maximal on Day 4 and Day 6 of pregnancy but low on Day 5. Pregnancy-associated protein synthesis was observed in many regions on polyacrylamide gels, including the β-lipoprotein, α2-macroglobulin, post-transferrin and albumin regions. Synthesis of the post-transferrin species rapidly increased from Day 4 to reach a maximum on Day 6 in the implantation tissue. The temporal pattern of synthesis of post-transferrin protein and of 'presumptive induced protein' suggests involvement in the processes of cell proliferation and decidualization.

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