中文摘要：

目的研究蛋白激酶C（PKC）对脂多糖（LPS）诱导内皮细胞β-1，4-半乳糖基转移酶-Ⅰ（β-1，4-galactosyltransferase-Ⅰ，β-1，4-GaIT-Ⅰ）表达的调节作用，以及对内皮细胞骨架结构改变及其黏附能力的影响。方法分别用PKC激动剂或几种不同类型的PKC抑制剂预处理人脐静脉内皮细胞（HUVECs）30rain，LPS刺激HUVECs4h后，RT-PCR、Western blot方法检测β-1，4-GaIT-Ⅰ表达变化，细胞荧光染色观察β-1，4-GaIT-Ⅰ催化的糖链表达变化及细胞骨架结构的改变，通过内皮-单核细胞黏附试验观察HUVECs黏附能力的改变。结果儿种不同类型的PKC抑制剂均能不同程度地抑制LPS刺激HUVECs引起的β-1，4-GaIT-Ⅰ表达的上调，PKC激动剂能够使上调的β-1，4-GAIT-Ⅰ的表达进-步增加；在HUVECs中β-1，4-GaIT-Ⅰ与细胞骨架有共同定位，PKC抑制剂显著抑制LPS诱导的内皮细胞骨架蛋白的重构和β-1，4-GaIT-Ⅰ细胞内的再分布；PKC抑制剂显著抑制LPS诱导的内皮-单核细胞黏附能力的上调。结论PKC可能参与调节LPS诱导的HUVECs β-1，4-GaIT-Ⅰ的表达，可能多种类型的PKC参与了这一调节过程；PKC可能通过对β-1，4-GaIT-Ⅰ的调节进而影响炎症过程中内皮细胞骨架蛋白的重构及内皮细胞与单核细胞的黏附能力。

英文摘要：

Objective To investigate the regulation of protein kinase C （PKC） to the expression of β-1,4-galactosyltransferase- Ⅰ（ β-1,4-GaIT- Ⅰ ） and the influence on cytoskeleton and adherence ability of human umbilical vein endothelial cells（HUVECs） when stimulated by lipopolysaccharide （LPS）. Methods Cultured HUVECs were pretreated by various PKC inhibitors or phorbol 12-myristate β-acctate（PMA） , an excitomotor of PKC respectively for 30 min, then stimulated by LPS for 4 h.1β-1,4-GaIT-Ⅰ expression were detected by RT-PCR and Western blot, expression of β-1,4-galactosylated carbohydrate chains and cytoskeleton were assayed by immumofluorescence, and adherence ability of HUVECs was observed by endothelial-monocyte cell adherence test. Results Up-regulated expression of β-1,4-GaIT- Ⅰ and β-1,4-galactosylated carbohydrate chains in HUVECs stimulated by LPS were suppressed by PKC inhibitors and increased by PMA. F-actin and β-1,4-GaIT-Ⅰ were partly co-localized in HUVECs. PKC inhibitor inhibited the effect of LPS on the distribution of F-actin and β-1,4-GAIT-Ⅰ . Adherence ability of HUVECs enhanced by LPS was significantly suppressed by PKC inhibitor. Conclusion PKC signal transduction pathway may participate in regulating β-1,4-GaIT-Ⅰ expression in endothelial cells stimulated by LPS. Furthermore, polytypes of PKC may participate in this regulating process; PKC might regulate cytoskeleton reorganization and adherence ability of EC through β-1,4-GaIT-Ⅰ during inflammation.