Purpose To investigate the location and distribution of EV71 receptors scavenger receptor class B member 2 ( SCARB2 ) and human P-selectin glycoprotein ligand-1 (PSGL-1) in lung tissues of fatal hand, foot and mouth disease (HFMD), healthy children and adults. Methods The expression of EV71 receptors SCARB2 and PSGL-1 was detected by using immunohistochemistry in lung tissues of 15 autopsies of HFMD, 3 of healthy children, 8 of healthy adults. Results SCARB2 distributed in bronchial, bronchioli ep-ithelia, alveolar epithelial cells and inflammatory cells among HFMD, healthy children and adults. No significant difference was noted of the positive rates of SCARB2 expression among these three groups (P>0. 05). PSGL-1 distributed in bronchial and bronchioli epi-thelium of adults, but no PSGL-1 expression was found in HFMD and healthy children. The positive rates of PSGL-1 were 100%, 0, 0 in bronchial and bronchioli epithelium among the three groups, respectively (P0. 05). Further, no PSGL-1 expression was observed in alveolar epithelia cells of all groups tested. Conclusions EV71 receptor SCARB2 distributes in bronchial, bronchioli, alveolar epithelial and inflammatory cells of HFMD. Meanwhile, PSGL-1 only distributes in inflammatory cells of HFMD, suggesting that SCARB2 possibly plays a role on HFMD infection.%目的：探讨人肠道病毒71型(enterovirus 71, EV71)清道夫受体B2(scavenger receptor class B member 2, SCARB2)和人P选择素糖蛋白配体-1(P-selectin glycoprotein ligand-1, PSGL-1)在重症手足口病(hand, foot and mouth disease, HFMD)患者、正常儿童及成人肺组织中的定位和分布。方法运用免疫组化SuperVision两步法检测15例重症HFMD患者、3例正常儿童及8例成人肺组织中SCARB2和PSGL-1的表达及分布。结果 SCARB2分布于重症HFMD患者、正常儿童及成人肺组织支气管上皮、细支气管上皮、肺泡上皮细胞及炎症细胞,其在三组中的阳性率差异无显著性( P>0．05)。 PSGL-1分布于成人肺组织支气管、细支气管上皮,但在重症HFMD患者及正常儿童中不表达,阳性率分别为100%、0、0,三组比较差异均有统计学意义(P0．05)；PSGL-1在三组的肺泡上皮细胞中均不表达。结论 EV71受体SCARB2分布于重症HFMD患者肺组织支气管上皮、细支气管上皮、炎症细胞及肺泡上皮细胞,PSGL-1仅分布于重症HFMD患者肺组织炎症细胞,提示SCARB2可能在重症HFMD的感染过程中具有一定作用。
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