Acute acrolein-induced cystitis in mice.

Area of Science:

• Toxicology
• Urology
• Inflammation Research

Background:

• Acrolein, a metabolite of cyclophosphamide, is implicated in chemical cystitis.
• A method for direct intravesical acrolein administration is needed to study its effects.
• Understanding strain-specific responses can elucidate genetic factors in cystitis.

Purpose of the Study:

• To establish a direct intravesical acrolein administration method in mice.
• To evaluate dose-dependent cystitis severity in C57BL/6N mice.
• To compare acrolein-induced cystitis severity across mouse strains (C57, C3H/HeJ, C3H/OuJ).

Main Methods:

• Intravesical instillation of varying acrolein doses (0-1000 microg) into female C57BL/6N mice.
• Bladder weight analysis and histological examination at 4 and 24 hours post-instillation.
• Comparative study involving C57, C3H/HeJ, and C3H/OuJ mice with 6 or 10 microg acrolein, including uroplakin immunohistochemistry.

Main Results:

• Acrolein instillation induced dose-dependent increases in bladder weight and inflammation.
• Higher acrolein doses (>200 microg) led to submaximal weight increases, suggesting bladder damage.
• C57BL/6N and C3H/HeJ mice exhibited greater bladder weight, edema, and inflammatory cell infiltration than C3H/OuJ mice.
• Acrolein caused urothelial and uroplakin loss, with C57BL/6N and C3H/HeJ mice showing more persistent damage at 24 hours.

Conclusions:

• Intravesical acrolein instillation is an effective method for inducing dose-dependent cystitis in mice.
• C3H/OuJ mice demonstrate relative resistance to the irritant effects of intravesical acrolein compared to C57BL/6N and C3H/HeJ mice.
• Future research will focus on identifying the genetic basis for observed strain differences in acrolein-induced cystitis.