Distribution of Eppin in mouse and human testis

Area of Science:

• Reproductive biology
• Molecular biology
• Genetics

Background:

• The human Eppin (hEppin) gene was identified in 2001 and later as a male immunocontraceptive target in 2004.
• Mouse Eppin (mEppin) gene expression and function were described in 2003, with recent studies indicating a similar male contraceptive effect in mice.

Purpose of the Study:

• To detect mEppin mRNA in mouse testes and cell lines using a hyperbiotinylated oligonucleotide DNA probe.
• To compare the expression patterns of mEppin and hEppin proteins in mouse and human testes.

Main Methods:

• In situ hybridization using a hyperbiotinylated oligonucleotide DNA probe to detect mEppin mRNA.
• RT-PCR and Western blot analysis to confirm mRNA expression.
• Immunohistochemistry using anti-c-kit and anti-eppin antibodies to localize protein expression in mouse and human testes.

Main Results:

• mEppin mRNA expression was found in Sertoli cells, spermatogonia, spermatocytes, and Leydig cells.
• mEppin protein was detected in A1-A4 spermatogonia.
• hEppin protein was detected in type A spermatogonia and early preleptotene spermatocytes, showing similar localization to mEppin.

Conclusions:

• The expression of hEppin is similar to mEppin and is localized to differentiated spermatogonia.
• The findings support the hypothesis that mEppin protein is secreted by Sertoli cells and taken up by spermatogonia.