Effect of calcium-sensitive receptor on intracellular Ca2+ concentration in pulmonary arterial smooth muscle cells of hypoxia-induced persistent pulmonary hypertension in mice
10.3760/cma.j.issn.2096-2932.2018.01.015
- VernacularTitle:钙敏感受体对低氧诱导的持续性肺动脉高压小鼠肺动脉平滑肌细胞内钙离子浓度的影响
- Author:
He LI
1
;
Qiang GU
;
Mengmeng WANG
;
Weiwei CAO
;
Ketao MA
Author Information
1. 832000,石河子大学医学院第一附属医院儿科
- Keywords:
Hypertension pulmonary;
Anoxia;
Receptors,calcium-sensing;
Myocytes,smooth muscle;
Mice
- From:Chinese Journal of Neonatology
2018;33(1):59-64
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the changes of intracellular calcium ion concentration in pulmonary artery smooth muscle cells (PASMCs) of hypoxic-induced persistent pulmonary hypertension (PPH) induced by calcium-sensitive receptor (CaSR) in a newborn mouse model.Method Ninety-six newbom C57BL/6 mice were randomly divided into control group,PPH group,PPH + agonist group and PPH + inhibitor group,with 24 mice in each group.The PPH model was induced by 12％ oxygen for 14 days.In the beginning,intraperitoneal injection of CaSR agonist (GdCl3) and CaSR inhibitor (NPS2390) were performed to mice in PPH + agonist group and PPH + inhibitor group respectively daily.After 14 days of modeling,pulmonary artery smooth muscle cells (PASMCs) of all four groups were cultured in vitro.Changes of Ca2+ fluorescence intensity in PASMCs of the four groups were detected by laser confocal microscope continuously.Result The ratio of pulmonary small vascular wall thickness to the vascular diameter and right ventricle/left ventricular thickness in PPH group were greater than those in the control group [(21.1％ ±1.8％) vs.(27.0％ ±0.9％),(0.62 ±0.22) vs.(0.83±0.45)],the differences were statistically significant (P ＜ 0.05),which imply that PPH mouse model was constructed successfully.The average Ca2+ fluorescence intensity in PASMCs of control group,PPH group,PPH + agonist group and PPH+ antagonist group were 122.5 ± 3.0,2 058.8 ±46.3,2 286.6 ±51.4 and 1 134.8 ± 8.5,respectively.The average Ca2+ fluorescence intensity in PASMCs of the PPH group,PPH + agonist group and PPH + antagonist group was higher than that of the control group respectively,the average Ca2+ fluorescence intensity in PASMCs of PPH group was higher than that of PPH + antagonist group,the differences were statistically significant (P ＜ 0.05).Whereas the difference of average Ca2 + fluorescence intensity in PASMCs of PPH group and PPH + agonist group was of no statistical significance (P ＞ 0.05).Conclusion CaSR may be involved in the occurrence and development of hypoxic-induced PPH in neonatal mice by affecting the intracellular Ca2+ concentration in pulmonary artery smooth muscle cells.
