金乌香冲剂中槟榔碱定量方法研究

对金乌香冲剂中槟榔碱进行了酸性染料比色法定量方法研究，结果表明在pH=5．0时，槟榔碱可与溴甲酚绿生成稳定呈色离子对，在槟榔碱浓度范围1．65μg／mL～10．4μg／mL内线性关系良好，r=0．9992，平均回收率99．7％，RSD=2．1％（n=5）。     

Effect of benactyzine and arecoline on the45Ca uptake by rat brain nerve endings

The effect of the central cholinolytic benactyzine and the cholinomimetic arecoline on the uptake of⁴⁵Ca by rat brain synaptosomes was studied in vitro. Benactyzine was shown to cause biphasic changes (a decrease followed by an increase) in the intensity of uptake of the isotope, whereas arecoline led to a rapid initial increase in⁴⁵Ca uptake. Benactyzine was shown to depress the effect of arecoline and depolarization on uptake of the isotope. It is concluded that the increase in⁴⁵Ca uptake through the action of arecoline is connected with activation of Nachannels. Benactyzine, on the other hand, reduces the permeability of the these channels for⁴⁵Ca and activates the Ca-channels proper.(Presented by Academician of the Academy of Medical Sciences of the USSR S. S. Golikov.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 86, No. 9, pp. 301–304, September, 1978.     

环氧合酶-2在口腔黏膜下纤维性变癌变过程中作用研究

目的 探讨环氧合酶-2（COX-2）在口腔黏膜下纤维性变（OSF）癌变组织中的表达，观察槟榔碱对人口腔角质形成细胞（KC）COX-2表达的影响。方法 应用免疫组化SP法检测15例OSF癌变组织，30例OSF组织，10例正常口腔黏膜中COX-2蛋白表达，Western-blot法检测不同浓度槟榔碱（30、60、90ug／mL）对KCCOX-2蛋白表达的影响。结果 COX-2在正常黏膜组织中无明显表达，在OSF组织及OSF癌变组织中阳性表达率分别是36．7％（11／30）、80．0％（12／15），且癌变组织中表达强度明显高于OSF组织（P〈0．05）；槟榔碱呈剂量依赖性增加KCCOX-2蛋白表达，不同浓度槟榔碱组均高于空白对照组（P〈0.05）。结论 COX-2在OSF癌变组织中表达异常增高，槟榔碱能增加KCCOX-2表达，COX-2过度表达可能在OSF癌变过程中起一定作用。     

Heat shock protein 27 expression in areca quid chewing-associated oral squamous cell carcinomas

Oral Diseases (2012) 18 , 713–719 Objectives: Heat shock protein (HSP) 27 is a low‐molecular‐weight protein that functions as a molecular chaperone and plays a cytoprotective role through its antioxidant activity during cell stress. Areca quid chewing is associated with the high incidence of oral squamous cell carcinomas (OSCCs) in Taiwan. The aim of this study was to compare heat shock protein 27 (HSP27) expression in OSCCs and the normal oral tissues. Methods: Forty‐eight OSCCs from areca quid chewers and ten normal oral tissue biopsy samples without areca quid chewing were analyzed by immunohistochemistry for HSP27. The normal human oral keratinocytes (HOKs) were challenged with arecoline, the major alkaloid of areca nut, by Western blot for HSP27. Furthermore, epigallocatechin‐3 gallate (EGCG), glutathione precursor N‐acetyl‐l ‐cysteine (NAC), cyclooxygenase‐2 inhibitor NS‐398, HSP inhibitor quercetin, extracellular signal‐regulated protein kinase (ERK) inhibitor PD98059, and p38 inhibitor SB203580 were added to find the possible regulatory mechanisms. Results: Heat shock protein 27 exhibited higher expression in OSCCs than normal specimens (P < 0.05). Arecoline was found to elevate HSP27 expression in a dose‐ and time‐dependent manner (P < 0.05). The additions of pharmacological agents were found to inhibit arecoline‐induced HSP27 expression (P < 0.05). Conclusions: Heat shock protein 27 expression is significantly elevated in areca quid chewing‐associated OSCCs. Arecoline‐induced HSP27 expression was downregulated by EGCG, NS398, NAC, quercetin, PD98059, and SB203580.     

槟榔碱诱导人脐静脉内皮细胞表达α-SMA的实验研究

目的：检测氯沙坦干预下、槟榔碱诱导的人脐静脉内皮细胞（HUVECs）表达α-SMA的情况。方法：用不同浓度槟榔碱刺激HUVECs,采用免疫细胞印迹法检测各组HUVECs中α-SMA的表达。再以固定槟榔碱浓度诱导HUVECs,不同浓度氯沙坦干预,检测各组HUVECs中α-SMA的表达。结果：槟榔碱可诱导HUVECs表达α-SMA,经氯沙坦干预后α-SMA的表达受到一定抑制。结论：HUVECs经槟榔碱刺激后可转化为表达α-SMA的肌成纤维细胞。血管紧张素Ⅱ受体拮抗剂氯沙坦可部分抑制这种转化,提示血管紧张素Ⅱ及其受体参与了槟榔碱诱导的内皮-间充质转化。     

槟榔碱通过促进巨噬细胞分泌含miR-155-5p外泌体诱导人口腔成纤维细胞的活化

目的 探讨槟榔碱（ARE）通过调控巨噬细胞外泌体内miR-155-5p水平诱导人口腔黏膜成纤维细胞向成纤维表型转化的作用机制。方法 以人单核细胞系（THP-1）与人口腔黏膜成纤维细胞系（HOMF）为研究对象。实验设为空白对照组、阴性对照组、ARE刺激组、ARE刺激后THP-1培养上清刺激组（CS）、ARE刺激后THP-1外泌体刺激组（EXO）、ARE刺激后THP-1无外泌体上清刺激组（NES）、miR-155-5p过表达组（miR-155-5p mimics）、ARE刺激后EXO处理对照组（NC+EXO-ARE）和miR-155-5p抑制联合ARE刺激后EXO处理（miR-155-5p inhibitor EXO-ARE）组。以流式细胞术检测THP-1细胞极化情况。Transwell细胞迁移实验检测HOMF细胞迁移能力。DCFH-DA检测细胞氧化应激水平。qRT-PCR检测细胞α-SMA、I型胶原和SOCS1的mRNA转录水平。免疫印迹实验检测细胞α-SMA、I型胶原与SOCS1蛋白表达。结果 流式检测显示,相较于对照组,ARE组THP-1细胞由M0趋向M1极化。ARE对THP-1和H...