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J Biol Chem, Vol. 274, Issue 38, 27056-27068, September 17, 1999

Sertolin Is a Novel Gene Marker of Cell-Cell Interactions in the Rat Testis

Dolores D. MrukDagger § and C. Yan ChengDagger

From the Dagger  Population Council, Center for Biomedical Research, New York, New York 10021 and the § Department of Zoology, University of Hong Kong, Hong Kong, People's Republic of China

A novel testicular protein designated sertolin was cloned. The full-length sertolin cDNA consists of 853 base pairs with an open reading frame of 381 base pairs coding for a 127-amino acid polypeptide that shares limited identities with antaxin/josephin and thrombospondin proteins. Sertolin (calculated molecular mass, 13,759 daltons) has two mRNA transcripts of 2.3 and 1 kilobase. A 22-amino acid peptide based on the deduced amino acid sequence of sertolin (NH2-KKEHFNLFKAASVSHLVQVVPQ) was synthesized and used for polyclonal antibody production. Immunoblot analysis detected a 17-kDa immunoreactive band in the Sertoli cell cytosol. Using Sertoli-germ cell cocultures, sertolin expression was found to be reduced by as much as 5-fold at the time when germ cells attach onto Sertoli cells but preceding the establishment of specialized inter-Sertoli-germ cell junctions. Neither FSH nor 17beta -hydroxy-5alpha -androstan-3-one was able to affect sertolin expression, whereas estradiol-17beta and progesterone induced a significant increase in Sertoli cell sertolin expression in vitro. In addition, interleukin-1alpha , a germ cell-derived cytokine, was also able to elicit a transient but significant increase in Sertoli cell sertolin expression. Sertolin expression was also shown to increase with testicular development and is likely to be associated with the onset of spermatogenesis. In addition, sertolin expression increased in the testis when generalized inflammation was induced in adult rats by injection of fermented yeast. These results show that sertolin will be useful in characterizing cell-cell interactions in the testis.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.


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