Polyglutamine-binding protein 1 protects mouse testes from heat stress

Area of Science:

• Reproductive biology
• Cellular stress response
• Molecular mechanisms of infertility

Background:

• Testicular heat exposure, from fever or undescended testes, causes male infertility by damaging sperm production.
• Cells form stress granules, RNA-protein complexes, to protect themselves from stress.
• The role of Polyglutamine binding protein 1 (PQBP1) in testicular thermal stress response was unknown.

Purpose of the Study:

• To investigate the role of PQBP1 in testicular heat stress.
• To determine if PQBP1 regulates stress granule formation in germ cells.
• To understand the impact of PQBP1 deficiency on sperm function under heat stress.

Main Methods:

• Utilized a mouse model with a Pqbp1 Y65C mutation.
• Exposed mice to heat stress and analyzed testicular tissue.
• Assessed stress granule assembly, sperm motility, and gene expression profiles.

Main Results:

• Mutant mice showed impaired stress granule assembly in testes after heat exposure.
• Heat-stressed mutant testes had significantly reduced sperm motility.
• Transcriptomic analysis revealed increased inflammation and cellular stress in mutant testes.

Conclusions:

• PQBP1 is essential for orchestrating the stress granule response during testicular heat stress.
• PQBP1 deficiency leads to defective germ cell homeostasis and impaired sperm function.
• Targeting the stress granule pathway may offer a therapeutic strategy for heat-induced male infertility.