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Current aspects of Leydig cell function and its regulation

Summary. Recent findings on Leydig cell function and its regulation are discussed. Regulatory mechanisms at different organizational levels, i.e. at the level of the pituitary, the testis and the intracellular elements, are briefly reviewed as well as the transmission and the modulation of the hormonal signal at the Leydig cell membrane. Special emphasis is given to local paracrine and autocrine regulatory interactions operating at the level of the testis.