Heat Stroke Induces Pyroptosis in Spermatogonia via the cGAS-STING Signaling Pathway

Area of Science:

• Cell Biology
• Reproductive Biology
• Immunology

Background:

• Cryptorchidism, or undescended testes, can lead to infertility due to heat-induced damage to spermatogonial cells.
• The precise molecular mechanisms underlying this damage, particularly cell death pathways, require further elucidation.
• Understanding these mechanisms is crucial for developing effective treatments for cryptorchidism-induced infertility.

Purpose of the Study:

• To investigate the role of the cGAS-STING pathway in regulating pyroptosis of spermatogonial cells exposed to heat stress.
• To identify potential therapeutic strategies for cryptorchidism by targeting the cGAS-STING pathway.

Main Methods:

• Spermatogonial GC-1 cells were subjected to heat stimulation to mimic cryptorchidism conditions.
• Cell viability, DNA damage (gamma-H2AX), and pyroptosis were assessed using CCK-8, immunofluorescence, and flow cytometry.
• Protein and gene expression of pyroptosis markers (Caspase-1, IL-1beta, NLRP3, GSDMD) and cGAS-STING pathway components were analyzed via western blot and PCR.
• The effect of STING silencing using siRNA on pyroptosis was evaluated.

Main Results:

• Heat stimulation induced pyroptosis in spermatogonial cells, evidenced by morphological changes, increased DNA damage, and elevated pyroptosis index.
• Expressions of pyroptosis-related proteins (Caspase-1, NLRP3, GSDMD) and cGAS-STING pathway proteins (cGAS, STING) were significantly upregulated.
• Silencing STING effectively inhibited heat-induced pyroptosis, indicating its critical role in the process.
• The cGAS-STING pathway was confirmed to be activated by heat stress in these cells.

Conclusions:

• The cGAS-STING pathway plays a significant role in mediating heat stress-induced pyroptosis in spermatogonial cells.
• This pathway represents a potential therapeutic target for managing infertility associated with cryptorchidism.
• Findings contribute to a deeper understanding of the molecular mechanisms underlying cryptorchidism-induced testicular damage.