Long-chain fatty acid esters of 5-androstene-3 beta, 17 beta-diol: composition and turnover in human mammary cancer cells in culture.
Long-chain fatty acid esters of the adrenal-derived estrogen 5-androstene-3 beta, 17 beta-diol (ADIOL) were found to accumulate in four human mammary cancer cell lines (MCF-7, ZR-75-1, MDA-MB-231 and MDA-MB-330) when explosed to 10-30 nM ADIOL for variable time periods. At each time point examined, the monoester fraction, which represented the major component of the total lipoidal fraction, contained fatty acids linked to either the 3 beta- or 17 beta-positions. However, there was considerable variation in the ratio of 3 beta- to 17 beta-monoesters in the four cell lines. By means of reverse phase HPLC and referral to authentic synthesized compounds, each monoester fraction was found to contain a number of long-chain fatty acid components whose composition resembled that previously determined for the fatty acid esters formed from 17 beta-estradiol. A specific and measurable turnover of a subfraction of ADIOL-17 beta-monoesters composed of essential fatty acids (22:6, 20:4, 18:3) occurred in MCF-7 cells, and to a lesser extent in ZR-75-1 cells. No changes were observed with time in any of the components of the 3 beta- or 17 beta-monoester fractions in MDA-MB-231 and MDA-MB-330 cells. These results, coupled with other studies, now suggest that a very rapid turnover of some components of these lipoidal derivatives may be occurring. If so, it is possible that the system of acylation-deacylation may be involved in a transport mechanism for estrogens and perhaps other steroid hormones.
Martyn
P
P
School of Biochemistry, University of New South Wales, Sydney, Australia.
Adams
J B
JB
D000215:Acylation; D015114:Androstenediol / Q000031:analogs & derivatives / Q000378:metabolism*; D000734:Androstenediols / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004958:Estradiol / Q000031:analogs & derivatives / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism*; D005260:Female; D006801:Humans; D013229:Stearic Acids / Q000378:metabolism; D014407:Tumor Cells, Cultured
D000734:Androstenediols; D005227:Fatty Acids; D013229:Stearic Acids; D004958:Estradiol; D015114:Androstenediol