SPARCL1在动脉粥样硬化斑块形成中的作用研究

The role of SPARCL1 in atherosclerotic plaque formation

目的探讨富含半胱氨酸的酸性分泌蛋白类似蛋白1(SPARCL1)对动脉粥样硬化(AS)斑块形成的影响。方法采用病例对照研究,选取394例AS确诊患者作为病例组,年龄、性别相匹配的394例健康对照者作为对照组。利用酶联免疫吸附试验测定血清SPARCL1表达水平;免疫组织化学实验评估SPARCL1蛋白在AS斑块区的表达水平及定位,同时检测AS患者和正常对照人群外周血的中性粒细胞及单核细胞的SPARCL1蛋白表达情况;构建SPARCL1过表达及抑制表达的重组腺病毒载体,以小鼠巨噬细胞(J774A.1)为靶细胞,进行细胞划痕实验观察SPARCL1对细胞迁移的影响。结果AS患者组的血清SPARCL1水平低于健康组(P<0.05);在AS斑块中检测到SPARCL1高表达,且主要表达在泡沫细胞胞浆;AS患者的外周血中性粒细胞及单核细胞SPARCL1表达水平低于正常对照(P<0.05);SPARCL1过表达及抑制表达的重组腺病毒构建成功;抑制SPARCL1表达的J774A.1细胞中的细胞迁移率降低,过表达SPARCL1的J774A.1细胞中的细胞迁移率增加(P<0.05)。结论SPARCL1在AS病变部位泡沫细胞高表达,这可能来自于外周血单核细胞和中性粒细胞的代偿性募集,SPARCL1可能作为血管保护因子参与抑制AS斑块的发生发展。

Objective To investigate the effect of cysteine-rich acidic secretory protein-like protein 1(SPARCL1)on atherosclerosis(AS)plaque formation.Methods A case-control study design was used,394 patients with confirmed AS were selected as the case group,and 394 healthy medical examiners matched for age and gender were selected as the control group.The expression level of serum SPARCL1 was determined by enzyme-linked immunosor-bent assay;immunohistochemistry was used to assess the expression level and localization of SPARCL1 protein in the AS plaque region,and the expression of SPARCL1 protein was also detected in the neutrophils and monocytes of peripheral blood of AS patients and normal controls;SPARCL1 overexpressing and the recombinant adenoviral vectors were constructed to inhibit SPARCL1 overexpression and expression,and the effects of SPARCL1 on cell migration were observed in the cell scratch assay using mouse macrophage cells(J774A.1)as target cells.Results Serum SPARCL1 levels in the AS patient group were lower than those in the healthy group(P<0.05);high SPARCL1 expression was detected in AS plaques and was mainly expressed in the cytoplasm of foamy cells;SPARCL1 expression levels in peripheral blood neutrophils and monocytes were lower than those in normal controls in AS patients(P<0.05);recombinant SPARCL1 overexpression and inhibition of expression of adenovirus was successfully constructed;the cell migration rate was decreased in J774A.1 cells that inhibited SPARCL1 expression and increased in J774A.1 cells that overexpressed SPARCL1(P<0.05).Conclusion SPARCL1 is highly expressed in foam cells at the site of AS lesions,which may result from compensatory recruitment of peripheral blood monocytes and neutrophils,and SPARCL1 may be involved as a protective factors for blood vessels in inhibiting the development of AS plaques.