半边莲生物碱抑制内皮素-1诱导的人脐动脉平滑肌细胞增殖

目的：探讨半边莲生物碱(LCLA)对内皮素-1（ET-1）诱导人脐动脉平滑肌细胞（VSMC）增殖的抑制效应及其作用机制。 方法： 采用细胞计数、［3H］-TdR掺入、流式细胞术、免疫细胞化学染色及Fura-3/AM 荧光探针标记方法检测VSMC增殖；并用台盼蓝拒染、乳酸脱氢酶（LDH）检测方法观察LCLA对VSMC的毒性反应。 结果： LCLA(100、200和400 mg/L)、BQ-123(10-6mol/L)、ST(10-7mol/L)均抑制ET-1所诱导的VSMC增殖（均P＜0.05）：明显降低VSMC的细胞数目、［3H］-TdR掺入量、S期和G2/M期的数目百分比，增加G0/G1期的数目百分比；减弱细胞内增殖细胞核抗原（PCNA）的表达强度和Ca2+荧光强度；LCLA的抑制作用存在明显的剂量依赖关系，但对VSMC存活率和LDH释放量均没有影响。 结论： LCLA浓度依赖性地抑制ET-1所诱导的人脐动脉VSMC增殖，其机制与降低VSMC内Ca2+含量有关。

Inhibitory effects of Lobelia Chinensis Lour alkaloid on the proliferation of human umbilical artery vascular smooth muscle induced by endothelin-1

AIM: To investigate the effects of Lobelia Chinensis Lour alkaloid (LCLA) on the proliferation of cultured vascular smooth muscle cells (VSMC) induced by ET-1. METHODS: Human umbilical artery VSMC was cultured and divided into five groups: ET group, ET LCLA group, ET BQ-123 group,ET staurosporine (ST) group and control group. The cell proliferation activity was subsequently quantified by cell counting kit-8 (CCK-8) and 3H]-TdR incorporation. Flow cytometry was used to examine cell cycle. Quantitative immunohistochemical technique was used to investigate the expression of proliferating cell nuclear antigen (PCNA) and confocal microscope was used to measure the fluorescent intensity of Ca 2 . Cytotoxicity was measured by Trypan blue exclusion and LDH colorimetry tests. RESULTS: BQ-123 (10 -6mol/L), ST (10 -7mol/L) and LCLA (100, 200 and 400 mg/L) inhibited the increase in cell number, 3H]-TdR incorporation, the percentage of the S phase and markedly decreased the expression of PCNA and fluorescent intensity of Ca 2 in response to ET-1 of VSMC (P<0.05). CONCLUSION: LCLA (100-400 mg/L) inhibits ET-1-induced proliferation of VSMC in a dose-dependent manner and the anti-proliferative effect is realized by reducing the Ca 2 concentration in VSMC.