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The effect of free fatty acids on the in-vitro binding of testosterone in human plasma.

The effect of supraphysiological levels of free fatty acids (FFA) on the binding of testosterone to sex-hormone binding globulin (SHBG) and on non-SHBG binding in both male plasma and plasma from pregnant women was studied. Six FFAs were added to plasma as individual acids. No alteration in testosterone binding to SHBG could be demonstrated with any of the FFAs in either male plasma or plasma from pregnant women. When the same plasma was heated to destroy SHBG binding, a highly significant (P < 0.01) increase in non-SHBG binding was seen in both male plasma and plasma from pregnant women when the unsaturated FFAs oleic, linoleic and linolenic acids were added. No significant difference was demonstrated with the saturated FFAs, palmitic, stearic and arachidic acids.