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The influence of resiniferatoxin on the chemical coding of caudal mesenteric ganglion neurons supplying the urinary bladder in the pig.
Journal of Physiology and Pharmacology : An Official Journal of the Polish Physiological Society 2016 August
Resiniferatoxin (RTX) is used as experimental drug therapy for a range of neurogenic urinary bladder disorders. The present study investigated the chemical coding of caudal mesenteric ganglion (CaMG) neurons supplying the porcine urinary bladder after intravesical RTX instillation. The CaMG neurons were visualized with retrograde tracer Fast Blue (FB) and their chemical profile was disclosed with double-labelling immunohistochemistry using antibodies against tyrosine hydroxylase (TH), neuropeptide Y (NPY), vasoactive intestinal polypeptide (VIP), somatostatin (SOM), calbindin (CB), galanin (GAL) and neuronal nitric oxide synthase (nNOS). It was found that in both the control (n = 6) and RTX-treated pigs (n = 6), the vast majority (92.3 ± 2.7% and 93.1 ± 1.3%, respectively) of FB-positive (FB(+)) nerve cells were TH(+). Intravesical instillation of RTX caused a decrease in the number of FB(+) / TH (+) neurons immunopositive to NPY (91.0 ± 2.2% in control animals vs. 58.8 ± 5.0% in RTX-treated pigs) or VIP (1.7 ± 0.5% vs. 0%) and an increase in the number of FB(+) / TH(+) neurons immunoreactive to SOM (3.4 ± 1.5% vs. 20.6 ± 4.3%), CB (1.8 ±0.7% vs. 13.4 ± 2.3%), GAL (1.5 ± 0.6% vs. 7.5 ± 1.0%) or nNOS (0% vs. 10.9 ± 3.4%). The present results suggest that therapeutic effects of RTX on the mammalian urinary bladder can be partly mediated by CaMG neurons.
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