Androgen-mediated pain-regulatory mechanisms targeting primary sensory neurons

Key Points

• This research aims to understand how androgens influence pain sensitivity in primary sensory neurons and explore the molecular basis of sex differences in pain perception.
• Used male and female mice to assess pain thresholds under mechanical, thermal, and chemical stimuli.
• Conducted androgen level assessments post-orchidectomy in male mice and observed pain threshold changes.
• Investigated androgen receptor expression in sensory neurons, particularly in male mice's dorsal root ganglia.
• Utilized androgen receptor knockout (AR-cKO) males to analyze pain responses compared to wild-type males.
• Administered androgens to female mice and measured resultant changes in pain thresholds and receptor localization.
• Female mice exhibited lower pain thresholds under mechanical stimulation compared to males, aligning with human reports.
• Orchidectomized males showed decreased pain thresholds, indicating a correlation between androgen levels and pain sensitivity.
• AR-cKO males displayed significantly lowered mechanical pain thresholds without changes in acute pain from other stimuli.
• Increased androgen receptor localization was noted in females after androgen treatment, coinciding with heightened pain thresholds, which disappeared in AR-cKO females.