目的：探讨钙卫蛋白（ CALP）在肾脏缺血再灌注损伤（ IRI）大鼠中的表达及其在炎症反应中的作用。方法：50只雄性SD大鼠随机分为IRI组和假手术组（ sham组），每组25只。各组分别于缺血再灌注后6 h、12 h、24 h、48 h和72 h观察肾脏病理改变，检测大鼠血清尿素氮（BUN）和肌酐（SCr）水平，ELISA法检测大鼠血清CALP、肿瘤坏死因子（ TNF）－α和白细胞介素（ IL）－6的含量，免疫组织化学法和Western blot法分别检测大鼠肾脏CALP、Toll样受体4（ TLR4）和NF－κB p65蛋白表达水平。结果：IRI组大鼠肾脏呈现不同程度的肾小管上皮细胞和间质损伤，伴炎细胞浸润。血清BUN、SCr、CALP及促炎细胞因子TNF－α、IL－6的含量在各时点均显著高于sham组（ P＜0．05）。 CALP、TLR4和NF－κB p65主要表达于肾小管上皮细胞胞质中，在IRI组呈高表达，在各时点各因子的表达与sham组相比均显著增强（ P＜0．05）。结论：肾脏IRI大鼠的血清CALP、TNF－α和IL－6水平升高， CALP、TLR4和NF－κB p65在肾组织中表达增强。 CALP在大鼠肾脏IRI的炎症反应中可能起重要作用。%[ ABSTRACT] AIM:To investigate the expression of calprotectin ( CALP) in the rats with renal ischemia-reperfu-sion injury ( IRI) .METHODS:Male Sprague-Dawley rats were randomly divided into sham operation and IRI group ( n=25 in each group) .Blood samples and the kidneys were obtained at 6 h, 12 h, 24 h, 48 h and 72 h after reperfusion.The pathological changes of the kidneys were observed.The serum concentrations of blood urea nitrogen ( BUN) and serum cre-atinine (SCr) were measured.The serum levels of CALP, tumor necrosis factor-α(TNF-α) and interleukin-6 (IL-6) were detected by ELISA, and the expression of CALP, Toll-like receptor 4 ( TLR4) and NF-κB p65 in the renal tissues were de-termined by the methods of immunohistochemistry and Western blot.RESULTS: Different serial ischemia changes were observed in the renal tissues, mainly in the renal tubular epithelial cells and the mesenchyma, with the infiltration of in-flammatory cells.The serum levels of BUN, SCr, CALP, TNF-αand IL-6 in IRI group were markedly increased as com-pared with sham group (P<0.05).The protein expression of CALP, TLR4 and NF-κB p65 in the renal tubular epithelial cells in IRI group was greatly enhanced in comparison with that in sham group ( P<0.05) .CONCLUSION:The serum concentrations of CALP, TNF-αand IL-6, and the protein expression levels of CALP, TLR4 and NF-κB p65 in the renal tissue are significantly increased in the rats with IRI, suggesting that calprotectin plays an important role in the inflamma-tion in rats with IRI.
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