Spermatogonial stem cell sensitivity to capsaicin: an in vitro study

Area of Science:

• Reproductive Biology
• Toxicology
• Cell Biology

Background:

• Conflicting reports exist on capsaicin's (CAP) effects on spermatogenesis.
• Capsaicin is the pungent compound in chili peppers.
• The role of CAP in germ cell survival and the expression of its receptor, TRPV1, in germ cells were investigated.

Purpose of the Study:

• To investigate the effect of capsaicin (CAP) on germ cell survival using cultured cell lines.
• To determine the expression of the capsaicin receptor, transient receptor potential vanilloid 1 (TRPV1), in germ cells.

Main Methods:

• Used rat spermatogonial stem cell lines (Gc-5spg, Gc-6spg) exposed to varying CAP concentrations.
• Assessed apoptosis via DNA fragmentation and caspase 3 activation.
• Investigated TRPV1 expression using immunolocalization and Western blots in vitro and in situ.

Main Results:

• CAP (150-250 uM) induced apoptosis-like effects in germ cell lines.
• Significant effects observed at 150 uM (Gc-5spg) and 200 uM (Gc-6spg) after 24h, showing dose and time dependency.
• TRPV1 was expressed in cultured spermatogonial stem cells and in situ premeiotic germ cells.

Conclusions:

• Capsaicin adversely affects spermatogonial survival in vitro.
• Apoptosis is induced in germ cells by capsaicin.
• TRPV1 expression in germ cells suggests its involvement in capsaicin's effects.