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Endocrinology, Vol 108, 88-95, Copyright © 1981 by Endocrine Society
ARTICLES |
M Ascoli
Several clonal lines of cultured Leydig tumor cells have been established and characterized in terms of gonadotropin receptors and steroid production. Although freshly isolated cells derived from the M5480P tumor have functional hCG receptors, only two of the five clonal lines established were shown to bind significant quantities of hCG. In these clones, steroid production can be stimulated to the same extent by hCG, cholera toxin, and 8-Br-cAMP. The other three clones bind a small amount of hCG and respond to the hormone with a marginal increase in steroidogenesis. Steroid production, however, is significantly stimulated by cholera toxin or 8-Br-cAMP. A comparison of the steroids produced by freshly isolated cells and two of the clones revealed some changes in the steroidogenic pathway. The most obvious change is an increase in the ability of the cultured cells to synthesize 20 alpha- dihydroprogesterone (20 alpha-hydroxypregn-4-en-3-one). These clonal lines may provide a suitable model system for the study of gonadotropin actions and regulation of the expression of differentiated functions of Leydig cells.
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T. Hirakawa and M. Ascoli The Lutropin/Choriogonadotropin Receptor-Induced Phosphorylation of the Extracellular Signal-Regulated Kinases in Leydig Cells Is Mediated by a Protein Kinase A-Dependent Activation of Ras Mol. Endocrinol., November 1, 2003; 17(11): 2189 - 2200. [Abstract] [Full Text] [PDF] |
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T. Hirakawa and M. Ascoli A Constitutively Active Somatic Mutation of the Human Lutropin Receptor Found in Leydig Cell Tumors Activates the Same Families of G Proteins as Germ Line Mutations Associated with Leydig Cell Hyperplasia Endocrinology, September 1, 2003; 144(9): 3872 - 3878. [Abstract] [Full Text] [PDF] |
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X. Wang, M. T. Dyson, Y. Jo, and D. M. Stocco Inhibition of Cyclooxygenase-2 Activity Enhances Steroidogenesis and Steroidogenic Acute Regulatory Gene Expression in MA-10 Mouse Leydig Cells Endocrinology, August 1, 2003; 144(8): 3368 - 3375. [Abstract] [Full Text] [PDF] |
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T. Diemer, J. A. Allen, K. H. Hales, and D. B. Hales Reactive Oxygen Disrupts Mitochondria in MA-10 Tumor Leydig Cells and Inhibits Steroidogenic Acute Regulatory (StAR) Protein and Steroidogenesis Endocrinology, July 1, 2003; 144(7): 2882 - 2891. [Abstract] [Full Text] [PDF] |
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J. J. Tremblay and R. S. Viger Transcription Factor GATA-4 Is Activated by Phosphorylation of Serine 261 via the cAMP/Protein Kinase A Signaling Pathway in Gonadal Cells J. Biol. Chem., June 6, 2003; 278(24): 22128 - 22135. [Abstract] [Full Text] [PDF] |
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H. Schwarzenbach, P. R. Manna, D. M. Stocco, G. Chakrabarti, and A. K. Mukhopadhyay Stimulatory Effect of Progesterone on the Expression of Steroidogenic Acute Regulatory Protein in MA-10 Leydig Cells Biol Reprod, March 1, 2003; 68(3): 1054 - 1063. [Abstract] [Full Text] [PDF] |
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J. J. Tremblay, F. Hamel, and R. S. Viger Protein Kinase A-Dependent Cooperation between GATA and CCAAT/Enhancer-Binding Protein Transcription Factors Regulates Steroidogenic Acute Regulatory Protein Promoter Activity Endocrinology, October 1, 2002; 143(10): 3935 - 3945. [Abstract] [Full Text] [PDF] |
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A. M. Trbovich, P. M. Sluss, V. M. Laurich, F. H. O'Neill, D. T. MacLaughlin, P. K. Donahoe, and J. Teixeira Mullerian Inhibiting Substance lowers testosterone in luteinizing hormone-stimulated rodents PNAS, March 1, 2001; (2001) 51632298. [Abstract] [Full Text] |
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