From Molecular Docking to Vascular Ion Channel Mechanisms: A Multitarget Study Of Zs 22-12
Annotatsiya
Intracellular calcium homeostasis plays a crucial role in the regulation of vascular smooth muscle contraction and relaxation. The present study investigated the vasorelaxant activity of ZS 22-12 using isolated rat thoracic aorta and in silico molecular docking analysis of calcium-regulating proteins. ZS 22-12 significantly inhibited both KCl-induced and phenylephrine-induced contractions in a concentration-dependent manner, with IC₅₀ values of 38.23 μM and 43.57 μM, respectively. Comparative studies with verapamil and phentolamine suggested that the vasorelaxant effect of ZS 22-12 is associated with modulation of voltage-dependent and receptor-operated calcium signaling pathways. To clarify the molecular mechanism, docking studies were performed with the Ca²⁺ L-type channel, Ca²⁺ R-type channel, SERCA, ryanodine receptor (RyR), Na⁺/Ca²⁺ exchanger (NCX), and Ca²⁺-ATPase. ZS 22-12 demonstrated stable binding affinities toward all investigated targets through hydrophobic, hydrogen bonding, and electrostatic interactions. Overall, the combined in vitro and in silico results indicate that ZS 22-12 acts as a multitarget modulator of calcium homeostasis in vascular smooth muscle cells and exhibits promising vasorelaxant potential.
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