p53基因与川崎病患者淋巴细胞凋亡关系探讨

目的：进一步探讨川崎病(KD)急性期患者外周血淋巴细胞凋亡延迟的机理。方法：采用斑点杂交(Dot-blot)检测淋巴细胞p53基因mRNA表达水平；流式细胞仪(FCM)检测p53蛋白质表达阳性细胞百分率。结果：KD患者外周血淋巴细胞p53基因mRNA和p53蛋白质表达水平降低，与正常儿童比较差异显著(P＜0.005)；当给予静脉注射免疫球蛋白(IVIG)治疗后或加入抗IL-6单抗培养时，外周血淋巴细胞p53基因mRNA和P53蛋白质表达水平提高。结论：KD急性期患者外周血淋巴细胞p53基因表达水平降低，其原因可能与本病患者异常升高的IL-6有关。p53基因具有促进细胞凋亡的作用，KD患者外周血淋巴细胞凋亡延迟可能与高浓度IL-6抑制p53基因的表达有关。

The expression of p53 gene in peripheral blood lymphocyte of acute Kawasaki disease

Objective: To further explore the mechanism of inhibited apoptosis of peripheral blood mononuclear cell (PBMC) in acute Kawasaki disease(KD). Methods: The expression level of p53 gene mRNA was determined by dot-blot; p53 protein positive cell percentage was detected by flow cytometry (FCM). Results:The expression of p53 gene mRNA and p53 protein in acute KD patients were decreased(P＜0.001), but increased after treating with intravenous immunoglobulin(IVIG) in vivo or adding anti-IL-6 monoantibody(mAb)into PBMC culture in vitro. Conclusion. The decreased expression of p53 gene mRNA and p53 protein may be associated with the high concentration of IL-6 in KD patients, p53 gene expression could induce lymphocyte apoptosis. Thus, the expression of p53 gene inhibited by the increased IL-6 production might be related to delaying or depressing apoptosis of PBMC in KD.