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Comparison of folylderivative biosynthesis in Ehrlich ascites carcinoma cells and in some organs of healthy and tumor-bearing mice.

Biosynthesis of folylderivatives derived from subcutaneously injected 2-[14C]folate was studied in Ehrlich ascites carcinoma (EAC) cells and in liver and kidneys of healthy and tumor-bearing mice. Retention of exogenous folate was followed by measurements of the total radioactivity of folylderivatives present in the EAC cells and organs examined. Identification of unconjugated and conjugated folylderivatives was done by means of column chromatography on Sephadex G-25, G-15 and cellulose sheets. The level of retained radioactivity in folyderivatives, being 5% in the liver and 1% in the kidneys of the radioactivity administered to mice, was similar in healthy and tumor-bearing animals. Moreover, no quantitative and qualitative differences were found in folylmono-and polyglutamates originated from the organs of healthy or tumor-bearing mice, although the content of folylpolyglutamates arose faster in liver and kidneys of EAC cells-bearing mice as well as in the tumor cells than in the organs of healthy mice.