SKF96365 activates calcium-sensing receptors in pulmonary arterial smooth muscle cells
2022
Miyaki, Riko | Yamamura, Aya | Kawade, Akiko | Fujiwara, Moe | Kondo, Rubii | Suzuki, Yoshiaki | Yamamura, Hisao
In pulmonary arterial smooth muscle cells (PASMCs), an increase in the cytosolic Ca²⁺ concentration ([Ca²⁺]cyₜ) is involved in many physiological processes such as cell contraction and proliferation. However, chronic [Ca²⁺]cyₜ increases cause pulmonary vasoconstriction and vascular remodeling, resulting in pulmonary arterial hypertension (PAH). Therefore, [Ca²⁺]cyₜ signaling plays a substantial role in the regulation of physiological and pathological functions in PASMCs. In the present study, the effects of SKF96365 on [Ca²⁺]cyₜ were examined in PASMCs from normal subjects and idiopathic pulmonary arterial hypertension (IPAH) patients. SKF96365 is widely used as a blocker of non-selective cation channels. SKF96365 did not affect the resting [Ca²⁺]cyₜ in normal-PASMCs. However, SKF96365 increased [Ca²⁺]cyₜ in IPAH-PASMCs in a concentration-dependent manner (EC₅₀ = 18 μM). The expression of Ca²⁺-sensing receptors (CaSRs) was higher in IPAH-PASMCs than in normal-PASMCs. The SKF96365-induced [Ca²⁺]cyₜ increase was inhibited by CaSR antagonists, NPS2143 and Calhex 231. The CaSR-mediated [Ca²⁺]cyₜ increase was facilitated by SKF96365 and the activation was blocked by NPS2143 or Calhex 231. In addition, the SKF96365-induced [Ca²⁺]cyₜ increase was reduced by siRNA knockdown of CaSRs. Taken together, SKF96365 activates CaSRs in IPAH-PASMCs and promotes [Ca²⁺]cyₜ signaling.
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