Involvement of Potassium Channels in Vasorelaxant Effect Induced by Valeriana prionophylla Standl. in Rat Mesenteric Artery

Figure 4

Participation of K⁺ channels in the vasorelaxation induced by VPR in mesenteric artery rings. Concentration-response curves showing the relaxant effect of VPR (0.01–300 μg/mL, cumulatively) in rings denuded endothelium precontracted with Phe (1 μM) in the absence or in the presence of (a) KCl 20 mM or TEA (3 mM); (b) 4-AP (1 mM) or Glib (10 μM); (c) TEA (1 mM) or BaCl₂ (30 μM). Values are expressed as mean ± SEM.

(a)

(b)

(c)