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AMIYA P. SINHA HIKIM, YUE JIA, YAN-HE LUE, CHRISTINA WANG, AND RONALD S. SWERDLOFF

can have specific effects on germ cell apoptosis and spermatogenesis. Detailed characterization of the underlying mechanism of those defects in these mutant mice will provide insight into the basic control mechanism of male germ apoptosis.

Recently, tissue-specific in vivo RNA interference (RNAi) approach has been used to elucidate the cell type-specific function of Williams’ tumor 1 (WT1) in regulating spermatogenesis (Rao et al., 2006). Mice depleted of WT1 in Sertoli cells exhibit increased germ cell apoptosis, loss of adherence junctions, and impaired fertility. By substituting different lineage-specific or regulated promoters and stem-loops corresponding to different gene targets, this system has the potential to knock down the expression of virtually any gene in a cell-type specific and temporally regulated manner. This novel in vivo RNAi approach may avoid the frequently observed problems of early lethality or developmental redundancy.

Our understanding of the regulation of male germ cell apoptosis has greatly expanded in recent years. Much progress has been made toward unraveling the key signal transduction pathways in apoptotic signaling of murine and primate male germ cells. However, significant gaps remain in our knowledge base. Emerging evidence now suggests a more direct role of cellular metabolism in governing cell death through either activation of a specific death pathway or loss of a critical survival pathway. During spermatogenesis, Sertoli-germ cell metabolic cooperation is essential for germ cell survival (Boussouar and Benahmed, 2004). Systemic glucose is taken by Sertoli cells, processed glycolytically into lactate, and transported across the plasma membrane to the germ cells by specific monocarboxylate transporter. The challenge is how to characterize the metabolic networks, using stable isotope-based metabolic flux phenotyping in conjunction with gas chromatography and mass spectrometry (Lee, 2006), and the novels aspects of those networks that actually necessary for male germ cell death. Metabolic profiling and its integration with signal transduction pathways inducing germ cell death will provide insight into how perturbation of the metabolic cooperation between Sertoli and germ cells affect germ cell survival.

Future efforts toward improved fertility control and clinical management of infertility associated with reduced sperm production in men are hampered by incomplete understanding of the processes responsible for normal germ cell homeostasis. Elucidation of the metabolic and molecular mechanisms by which various environmental stresses and male contraceptive approaches regulates germ cell death will fill a major gap in our knowledge of this fundamental biological process.

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