Indexed on: 01 Jun '80Published on: 01 Jun '80Published in: Lipids
The metabolism of [1-14C]linoleic, [1-14C]arachidonic and [3-14C]docosa-4,7,10,13,16-pentaenoic acids was investigated after intratesticular injection of the labeled compounds and isolation of rat Sertoli and germinal cells. Following injection of either14C-linoleate or14C-arachidonate, the specific activity (sp act) of docosa-4,7,10,13,16-pentaenoic acid of Sertoli cells was greater than that of the germinal cells. The data suggest that the Sertoli cells are more active in the biosynthesis of the 22-carbon pentaene than the germinal cells. Differences between these 2 cell types were also noted in the distribution of the incorporated14C among the various lipid classes. Following intratesticular injection of14C-docosapentaenoic acid, a greater proportion of the recovered14C in Sertoli cells than in germinal cells was present in 20-carbon fatty acids, suggesting a greater activity in Sertoli cells in the metabolism of the pentaene. The major portion of the recovered14C in both cell types was present in triacylglycerols during early time periods and in phospholipids after 24 hr. The possibility of transfer of biosynthesized docosapentaenoic acid from Sertoli to germinal cells is discussed.