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Section of Hypertension and Vascular Research,
We recently reported that Ca2+-induced relaxation could be linked to a Ca2+ receptor (CaR) present in perivascular nerves. The present study assessed the effect of chronic sensory denervation on Ca2+-induced relaxation. Mesenteric resistance arteries were isolated from rats treated as neonates with capsaicin (50 mg/kg), vehicle, or saline. The effect of cumulative addition of Ca2+ was assessed in vessels precontracted with 5 µM norepinephrine. Immunocytochemical studies showed that capsaicin treatment significantly reduced the density of nerves staining positively for calcitonin gene-related peptide (CGRP) and for the CaR (CGRP density: control, 51.1 ± 3.9 µm2/mm2; capsaicin treated, 31.4 ± 2.8 µm2/mm2, P = 0.01; control CaR density, 46 ± 4 µm2/mm2, n = 7; capsaicin-treated CaR density, 24 ± 4 µm2/mm2, n = 8, P = 0.002). Dose-dependent relaxation to Ca2+ (1-5 mM) was significantly depressed in vessels from capsaicin-treated rats (overall P < 0.001, n = 6 or 7), whereas the relaxation response to acetylcholine remained intact. These data support the hypothesis that Ca2+-induced relaxation is mediated by activation of the CaR associated with capsaicin-sensitive perivascular neurons.
calcium receptor; sensory nerves; dorsal root ganglia; vascular smooth muscle
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