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Endocrinology Vol. 139, No. 4 1883-1890
Copyright © 1998 by The Endocrine Society

ARTICLES

Testicular Leukemia Inhibitory Factor (LIF) and LIF Receptor Mediate Phosphorylation of Signal Transducers and Activators of Transcription (STAT)-3 and STAT-1 and Induce c-fos Transcription and Activator Protein-1 Activation in Rat Sertoli But Not Germ Cells1

Shirzad Jenab and Patricia L. Morris

Population Council (S.J., P.L.M.) and The Rockefeller University (P.L.M.), New York, New York 10021

Address all correspondence and requests for reprints to: Patricia L. Morris, Center for Biomedical Research, Population Council and The Rockefeller University, 1230 York Avenue, New York, New York 10021.

Increasing amounts of evidence suggest noninflammatory roles for growth factor and cytokines in development and differentiation. Leukemia inhibitory factor (LIF) belongs to a gp130 pleiotropic family of growth factors that has recently been shown to enhance the survival of rat testicular gonocytes and Sertoli cells. In this study, we show the expression of gp130 and LIF messenger RNAs (mRNAs) in the somatic (the Sertoli and Leydig cells) and specific germ cells (spermatogonia, pachytene, round, and elongated spermatids) of rodent testis, suggestive of cell-specific LIF-mediated functions. LIF receptor mRNA was demonstrated in rat somatic cells, rat elongating spermatids, and all of the mouse germ cells. In addition, we characterized the effects of LIF on the signal transducers and activators of transcription (STAT)-3 and STAT-1, c-fos gene expression, and activator protein-1 regulation in primary rat Sertoli cells. Electrophoretic mobility shift assay and Western blot analysis demonstrated that LIF translocates STAT-3 (and to a lesser extent STAT-1) transcription factor(s) to the nucleus within 2 min of exposure in a tyrosine but not serine/threonine phosphorylation-dependent pathway. Quantitative solution hybridization analysis revealed a transient increase in c-fos mRNA levels by 20-fold following 30–45 min of LIF treatment, an effect that was inhibited by the tyrosine, as well as serine/threonine kinase inhibitors, genistein, and H7. Subsequently, LIF treatment of the Sertoli cells increased nuclear activator protein-1 binding proteins at 2 h after its addition, an effect that was also sensitive to genistein and H7 pretreatments. In contrast, LIF treatment of primary rat germ cells did not alter c-fos mRNA levels. Species specificity in the expression of LIF receptor as well as ligand binding may play a role in LIF signaling in these germ cells. Thus, using a primary Sertoli cell model, we demonstrated that the testicular LIF signaling pathway is contingent on the phosphorylation of latent transcription factors. Our data are consistent with LIF-mediated signaling events involving both somatic and germ cells during spermatogenesis.




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