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Institute for Hormone and Fertility Research (R.I., M.B., A.-N.S., R.D., N.H., E.K., A.K.M.), University of Hamburg, 22529 Hamburg, Germany; and Department of Human Anatomy (E.H., H.M.C.), University of Oxford, United Kingdom
Address all correspondence and requests for reprints to: R. Ivell, Institute for Hormone and Fertility Research, University of Hamburg, Grandweg 64, 22529 Hamburg, Germany.
Expression of the relaxin-like factor (RLF) was studied at the messenger RNA (mRNA) and protein levels in the testes and ovaries of the mouse, as well as through testicular development and differentiation in the mouse testis. In situ hybridization or RT-PCR, and immunohistochemistry using a polyclonal antibody raised against a recombinant protein, provided mutually confirmatory results for a high expression of RLF in the Leydig cells of the adult testis and at a much lower level of expression in the luteal cells of the ovary through the cycle, pregnancy, and in lactation. Analysis of protein and mRNA expression, through postnatal testicular development, indicated moderate RLF expression also in the fetal population of Leydig cells, even in the hpg mutant mouse, lacking an active pituitary-gonadal axis. Prepubertal Leydig cells, however, exhibit only very low-level RLF gene expression, this phenotype persisting in the adult hpg mouse. In summary, fetal Leydig cells express RLF in an LH/human CG-independent fashion, whereas LH/human CG is essential to induce RLF expression in the adult-type Leydig cell. In cultured adult Leydig cells or in the mouse tumor MA-10 cell line, RLF mRNA is expressed in a constitutive fashion. RLF thus seems to be a useful marker of Leydig cell differentiation status.
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W. Pusch, M. Balvers, G. F. Weinbauer, and R. Ivell The Rat Endozepine-Like Peptide Gene Is Highly Expressed in Late Haploid Stages of Male Germ Cell Development Biol Reprod, September 1, 2000; 63(3): 763 - 768. [Abstract] [Full Text] |
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S. Y. Hsu Cloning of Two Novel Mammalian Paralogs of Relaxin/Insulin Family Proteins and Their Expression in Testis and Kidney Mol. Endocrinol., December 1, 1999; 13(12): 2163 - 2174. [Abstract] [Full Text] |
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R. Bathgate, N. Moniac, B. Bartlick, M. Schumacher, M. Fields, and R. Ivell Expression and Regulation of Relaxin-Like Factor Gene Transcripts in the Bovine Ovary: Differentiation-Dependent Expression in Theca Cell Cultures Biol Reprod, October 1, 1999; 61(4): 1090 - 1098. [Abstract] [Full Text] |
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K. J. Teerds, M. de Boer-Brouwer, J. H. Dorrington, M. Balvers, and R. Ivell Identification of Markers for Precursor and Leydig Cell Differentiation in the Adult Rat Testis Following Ethane Dimethyl Sulphonate Administration Biol Reprod, June 1, 1999; 60(6): 1437 - 1445. [Abstract] [Full Text] |
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M. R. Zarreh-Hoshyari-Khah, A. Einspanier, and R. Ivell Differential Splicing and Expression of the Relaxin-Like Factor Gene in Reproductive Tissues of the Marmoset Monkey (Callithrix jacchus) Biol Reprod, February 1, 1999; 60(2): 445 - 453. [Abstract] [Full Text] [PDF] |
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