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Area of Science:

  • Environmental Health
  • Reproductive Biology
  • Toxicology

Background:

  • Male infertility is a growing global health concern.
  • Fluoride exposure is linked to male reproductive decline, but mechanisms are unclear.
  • Testicular somatic cells (Leydig and Sertoli) are crucial for male reproduction.

Purpose of the Study:

  • To elucidate the mechanism of fluoride-induced male reproductive toxicity.
  • To identify key molecular players involved in fluoride's effects on testicular cells.
  • To explore potential therapeutic targets for fluoride-induced male infertility.

Main Methods:

  • Assessing mouse sperm quality and testicular tissue structure.
  • Analyzing autophagosome levels in Leydig and Sertoli cells.
  • Employing network toxicology and functional analysis to identify regulatory miRNAs and target genes.

Main Results:

  • Fluoride exposure reduced sperm quality and damaged testicular somatic cells.
  • Fluoride induced an imbalance in autophagy within Leydig (increased) and Sertoli (decreased) cells.
  • miR-34a-5p and its target REST were identified as critical mediators of fluoride-induced autophagic disruption.

Conclusions:

  • Fluoride disrupts male reproduction by altering miR-34a-5p/REST-mediated autophagy in testicular somatic cells.
  • Down-regulation of miR-34a-5p in Leydig cells activates autophagy via REST.
  • Up-regulation of miR-34a-5p in Sertoli cells inhibits autophagy by suppressing REST.