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Department of Pathology (T.R.K., G.P., P.W., M.M.M) Department
of Cell Biology (M.M.M.) Department of Molecular and Human Genetics
(M.M.M.) Baylor College of Medicine Houston, Texas 77030
Department of Medicine and Neurobiology and Physiology
(T.K.W.) Northwestern University Chicago, Illinois 60611
Department of Molecular Biology and Pharmacology (I.B.)
Washington University School of Medicine St. Louis, Missouri
63110
Genetics Institute (M.C.B.) Cambridge,
Massachusetts 02140
The role of FSH in gonadal tumorigenesis and, in particular, in human ovarian cancer has been debated. It is also unclear what role the elevated FSH levels in the inhibin-deficient mouse play in the gonadal tumorigenesis. To directly assess the role of FSH in gonadal growth, differentiation, and gonadal tumorigenesis, we have generated both gain-of-function and loss-of-function transgenic mutant mice. In the gain-of-function model, we have generated transgenic mice that ectopically overexpress human FSH from multiple tissues using a mouse metallothionein-1 promoter, achieving levels far exceeding those seen in postmenopausal women. Male transgenic mice are infertile despite normal testicular development and demonstrate enlarged seminal vesicles secondary to elevated serum testosterone levels. Female transgenic mice develop highly hemorrhagic and cystic ovaries, have elevated serum estradiol and progesterone levels, and are infertile, mimicking the features of human ovarian hyperstimulation and polycystic ovarian syndromes. Furthermore, the female transgenic mice develop enlarged and cystic kidneys and die between 613 weeks as a result of urinary bladder obstruction. In a complementary loss-of-function approach, we have generated double-homozygous mutant mice that lack both inhibin and FSH by a genetic intercross. In contrast to male mice lacking inhibin alone, 95% of which die of a cancer cachexia-like syndrome by 12 weeks of age, only 30% of the double-mutant male mice lacking both FSH and inhibin die by 1 yr of age. The remaining double-mutant male mice develop slow-growing and less hemorrhagic testicular tumors, which are noted after 12 weeks of age, and have minimal cachexia. Similarly, the double-mutant female mice develop slow-growing, less hemorrhagic ovarian tumors, and 70% of these mice live beyond 17 weeks. The double-mutant mice demonstrate minimal cachexia in contrast to female mice lacking only inhibin, which develop highly hemorrhagic ovarian tumors, leading to cachexia and death by 17 weeks of age in 95% of the cases. The milder cachexia-like symptoms of the inhibin and FSH double-mutant mice are correlated with low levels of serum estradiol and activin A and reduced levels of aromatase mRNA in the gonadal tumors. Based on these and our previous genetic analyses, we conclude that elevated FSH levels do not directly cause gonadal tumors. However, these results suggest FSH is an important trophic modifier factor for gonadal tumorigenesis in inhibin-deficient mice.
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W. Xing and M. R. Sairam Role of CACC-Box in the Regulation of Ovine Follicle-Stimulating Hormone Receptor Expression Biol Reprod, October 1, 2001; 65(4): 1142 - 1149. [Abstract] [Full Text] [PDF] |
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N. Danilovich, I. Roy, and M. R. Sairam Ovarian Pathology and High Incidence of Sex Cord Tumors in Follitropin Receptor Knockout (FORKO) Mice Endocrinology, August 1, 2001; 142(8): 3673 - 3684. [Abstract] [Full Text] [PDF] |
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S. C. Cipriano, L. Chen, K. H. Burns, A. Koff, and M. M. Matzuk Inhibin and p27 Interact to Regulate Gonadal Tumorigenesis Mol. Endocrinol., June 1, 2001; 15(6): 985 - 996. [Abstract] [Full Text] [PDF] |
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I. Huhtaniemi and A. Bartke Perspective: Male Reproduction Endocrinology, June 1, 2001; 142(6): 2178 - 2183. [Full Text] [PDF] |
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C. M. Allan, M. Haywood, S. Swaraj, J. Spaliviero, A. Koch, M. Jimenez, M. Poutanen, J. Levallet, I. Huhtaniemi, P. Illingworth, et al. A Novel Transgenic Model to Characterize the Specific Effects of Follicle-Stimulating Hormone on Gonadal Physiology in the Absence of Luteinizing Hormone Actions Endocrinology, June 1, 2001; 142(6): 2213 - 2220. [Abstract] [Full Text] [PDF] |
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X. Guo, P. L. Morris, and L. J. Gudas Follicle-Stimulating Hormone and Leukemia Inhibitory Factor Regulate Sertoli Cell Retinol Metabolism Endocrinology, March 1, 2001; 142(3): 1024 - 1032. [Abstract] [Full Text] [PDF] |
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C. Yan and M. M. Matzuk Transgenic Models of Ovarian Failure Reproductive Sciences, January 1, 2001; 8(1_suppl): S30 - S33. [Abstract] [PDF] |
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A. P. N. Themmen and I. T. Huhtaniemi Mutations of Gonadotropins and Gonadotropin Receptors: Elucidating the Physiology and Pathophysiology of Pituitary-Gonadal Function Endocr. Rev., October 1, 2000; 21(5): 551 - 583. [Abstract] [Full Text] |
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S. C. Cipriano, L. Chen, T. R. Kumar, and M. M. Matzuk Follistatin Is a Modulator of Gonadal Tumor Progression and the Activin-Induced Wasting Syndrome in Inhibin-Deficient Mice Endocrinology, July 1, 2000; 141(7): 2319 - 2327. [Abstract] [Full Text] [PDF] |
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