Capsaicin-induced bladder hyperactivity
- Capsaicin is a selective excitotoxin of C-fiber primary afferent neurons.
- Acts through the stimulation of a vanilloid receptor (VR1).
- Release of tachykinins and other mediators at both the peripheral and spinal cord level.
- Useful for quick investigation of the effect of drugs known to act on C-fiber afferents.
rat, guinea pig
- Cystometrogram displays:
- decrease in the intercontraction interval.
- decrease in the pressure threshold for eliciting contractions.
- Increase C-Fos positive cells in the spinal cord (L6 level).
|Figure 1: Representative cystometrograms showing the effect of capsaicin-induced bladder hyperactivity in anesthetized female rat. Arrows indicate the voiding contractions. (Pelvipharm, internal data).|
The bladder is perfused with continuous capsaicin (30 µM) at a rate of 50 µl/min while intravesical and blood pressure are monitored concomitantly.
NB: Pelvipham will gladly study the feasibility to fit this experimental model in order to meet its client’s needs.
Links to applicable Experimental skills