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Department of Pathology and Laboratory Medicine, Brown University, Providence, Rhode Island 02912
Address all correspondence and requests for reprints to: Kamin J. Johnson, Department of Pathology and Laboratory Medicine, Brown University, Box G-B5, Providence, Rhode Island 02912. E-mail: kamin_johnson{at}brown.edu
Adhesion between germ and Sertoli cells is thought to be crucial for
spermatogenesis. Cadherin superfamily proteins, including classic
cadherins and protocadherins, are important mediators of cell-cell
adhesion. Using a degenerate PCR cloning strategy, we surveyed the
expression of cadherin superfamily members in rat testis. Similar to
brain, testis expressed a large number of cadherin superfamily members:
7 classic cadherins of both types I and II, 14 protocadherins, 2
protocadherin-related cadherins, and 1 cadherin-related receptor-like
protein. All three protocadherin families (
, ß, and
) were
found in testis. Using a semiquantitative RT-PCR assay, messenger RNA
expression was determined for each cadherin superfamily member during a
postnatal developmental time-course and following ablation of specific
testis cell types by ethanedimethanesulfonate, methoxyacetic acid, and
2,5-hexanedione. Diverse expression patterns were observed among the
cadherins, suggesting that cadherin expression is cell type-specific in
testis. The large number and variety of cadherin superfamily members
found in testis supports a critical function for cadherin-mediated
cell-cell adhesion in spermatogenesis.
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