Retinol and retinoic acid increase MMP-2 activity by different pathways in cultured Sertoli cells

Area of Science:

• Cell Biology
• Biochemistry
• Reproductive Biology

Background:

• Oxidative stress and matrix metalloproteinase (MMP) dysregulation are implicated in diseases like cancer and atherosclerosis.
• Previous research suggests a link between MMP activity and reactive oxygen species (ROS).
• Retinol treatment was previously shown to alter Sertoli cell metabolism and induce oxidative stress.

Purpose of the Study:

• To investigate the effects of retinol and retinoic acid on MMP activity and ROS production in Sertoli cells.
• To elucidate the signaling pathways involved in retinol- and retinoic acid-induced MMP activity.

Main Methods:

• Sertoli cells were treated with retinol or retinoic acid.
• Matrix metalloproteinase (MMP) activity was assessed using gelatin zymography.
• Reactive oxygen species (ROS) production was quantified using DCFH-DA oxidation.
• ERK1/2 phosphorylation was analyzed, and its role was investigated using the inhibitor UO126.

Main Results:

• Both retinol (7 microM) and retinoic acid (1 nM) induced MMP-2 activity in Sertoli cells.
• Antioxidants reversed retinol-induced MMP-2 activity but not retinoic acid-induced activity.
• Retinol, but not retinoic acid, increased ROS production.
• Both compounds induced ERK1/2 phosphorylation, but only retinol-induced MMP-2 activity was sensitive to ERK1/2 inhibition.

Conclusions:

• Retinol-induced MMP-2 activity in Sertoli cells is linked to ERK1/2 phosphorylation and ROS production.
• Retinoic acid-induced MMP-2 activity appears to be independent of ROS and ERK1/2 signaling.
• These findings highlight differential mechanisms of vitamin A metabolite action on Sertoli cell function.