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A unique intercellular pathway of leucine catabolism was observed in vitro in rat spermatogenic epithelium. Sertoli cells convert leucine via transmination into 4-methyl-2-oxovalerate, and spermatocytes and spermatids reduce exogenous 4-methyl-2-oxovalerate to 2-hydroxy-4-methylvalerate, which is then released by the spermatogenic cells. The NADH-dependent reduction of 4-methyl-2-oxovalerate could be catalysed by the male-germ-cell-specific lactate dehydrogenase isoenzyme LDH-C4 in the cytosol of the spermatogenic cells, concomitant with the NAD+-dependent conversion of exogenous lactate into pyruvate.

Intercellular pathway of leucine catabolism in rat spermatogenic epithelium