Cadmium disrupts spermatogenic cell cycle via piRNA-DQ717867/p53 pathway

Area of Science:

• Environmental Toxicology
• Molecular Biology
• Reproductive Biology

Background:

• Cadmium (Cd) is a toxic environmental pollutant affecting multiple organ systems.
• Male reproductive toxicity is a significant concern associated with cadmium exposure.
• Piwi-interacting RNAs (piRNAs) play crucial roles in spermatogenesis and genome stability.

Purpose of the Study:

• To investigate the impact of cadmium chloride (CdCl2) exposure on spermatogenesis in male rats.
• To identify specific piRNAs affected by cadmium exposure and elucidate their role in reproductive toxicity.
• To explore the mechanism by which cadmium-induced piRNA dysregulation affects cell cycle control.

Main Methods:

• Male rats were exposed to CdCl2 orally for 28 days.
• Testis tissues were analyzed for piRNA expression using microarray and qPCR.
• GC-2spd cells were used to study the effects of piRNA manipulation on cell cycle regulation.

Main Results:

• Cadmium exposure significantly altered piRNA expression in rat testis, notably piRNA-DQ759395.
• A similar piRNA, piRNA-DQ717867, was upregulated in GC-2spd cells upon CdCl2 exposure, causing cell cycle arrest.
• Evidence suggests piRNA-DQ717867 interacts with p53, disrupting cell cycle-related protein expression and activating p53 pathways.

Conclusions:

• Cadmium exposure induces abnormal piRNA expression in rat testis, contributing to male reproductive toxicity.
• piRNA-DQ717867 plays a role in regulating p53 and cell cycle progression in GC-2spd cells.
• These findings highlight the critical role of piRNAs in maintaining male reproductive health and mitigating cadmium-induced toxicity.