Objective: To study the expression of cyclooxygenase-2 (COX-2) protein in different subtypes of intestinal metaplasia (IM) and gastric carcinoma, evaluate the possibility of COX-2 forecasting the risk of malignant pot...Objective: To study the expression of cyclooxygenase-2 (COX-2) protein in different subtypes of intestinal metaplasia (IM) and gastric carcinoma, evaluate the possibility of COX-2 forecasting the risk of malignant potential of IM, and the relationship between COX-2 expression and gastric carcinogenesis. Methods: Forty cases of chronic atrophic gastritis (CAG) with IM, 40 cases of gastric carcinoma and corresponding paracancerous tissues were selected to construct a tissue microarray. High iron diamine/alcian blue (HID/AB) staining and Hematoxylin and Eosin (HE) staining was used to classify IM and gastric carcinoma, and the expression of COX-2 protein detected in different subtypes of IM and gastric cancer by using immunohistochemistry. Results: The positive expression rate of COX-2 was 45.65%, 59.38% and 77.27% in IM foci in CAG, IM foci in paracancerous tissues, and intestinal-type gastric carcinoma, respectively, significantly higher than in diffuse-type gastric cancer (16.67%)(P<0.05, 0.005 and 0.005, respectively), and the expression intensity of COX-2 protein showed a increased tendency gradually in the sequence of IM foci in CAG→IM foci in paracancerous tissues→intestinal-type gastric carcinoma (P<0.005). The positive expression rate of COX-2 protein in type Ⅲ IM was significantly higher than in type Ⅰ and type Ⅱ IM (P<0.005 and 0.05, respectively), and the expression intensity also showed a increased tendency gradually from type Ⅰ to type Ⅲ IM (P<0.005). Conclusion: The expression level of COX-2 was increased gradually along with the increase of the risk of malignancy of IM, and its expression level may be a useful index to forecast the risk of malignant potential of IM. COX-2 expression was associated with intestinal-type gastric carcinoma, but it might also have some role in the carcinogenesis of diffuse-type gastric carcinoma.展开更多
目的探讨乳酸菌培养上清液(lactobacilli supernatants,LS)处理乳腺癌细胞对顺铂(cisplatin,DDP)敏感性的影响及其机制。方法采用CCK-8和Western blot检测不同浓度DDP(0、1、2、3、4、5μg/m L)和LS(体积分数分别为1%、5%、10%、20%)对...目的探讨乳酸菌培养上清液(lactobacilli supernatants,LS)处理乳腺癌细胞对顺铂(cisplatin,DDP)敏感性的影响及其机制。方法采用CCK-8和Western blot检测不同浓度DDP(0、1、2、3、4、5μg/m L)和LS(体积分数分别为1%、5%、10%、20%)对三阴性乳腺癌细胞MDA-MB-231增殖和Piwil2基因表达的影响;瞬时转染Piwil2 siRNA沉默MDA-MB-231细胞中Piwil2基因表达,Western blot检测其沉默效果,CCK-8检测Piwil2基因沉默后对MDA-MB-231细胞增殖的影响;2μg/m L DDP联合不同浓度LS(体积分数分别为1%、5%、10%、20%)作用MDA-MB-231细胞,观察细胞增殖抑制效应和Piwil2蛋白表达的改变。结果高浓度DDP(≥3μg/m L)可抑制MDA-MB-231细胞的增殖(P<0.05),而低浓度DDP(≤2μg/m L)不能有效抑制细胞增殖;DDP以剂量依赖性方式上调Piwil2蛋白的表达;siRNA沉默Piwil2表达可恢复2μg/m L DDP对细胞增殖的抑制。与对照组(乳酸菌培养基,MRS)比较,LS以剂量依赖性方式下调Piwil2蛋白的表达,但并不影响细胞的增殖;与单用2μg/m L DDP比较,2μg/m L DDP联合20%LS处理可显著下调Piwil2蛋白的表达并抑制细胞增殖(P<0.05)。结论三阴性乳腺癌细胞中Piwil2的高表达可导致细胞对顺铂敏感性的降低,乳酸菌培养上清液可通过下调Piwil2基因的表达增强三阴性乳腺癌细胞对顺铂的敏感性。展开更多
基金This study was supported by the Key Clinical Project of the Chinese Ministry of Health (No. 20012130)
文摘Objective: To study the expression of cyclooxygenase-2 (COX-2) protein in different subtypes of intestinal metaplasia (IM) and gastric carcinoma, evaluate the possibility of COX-2 forecasting the risk of malignant potential of IM, and the relationship between COX-2 expression and gastric carcinogenesis. Methods: Forty cases of chronic atrophic gastritis (CAG) with IM, 40 cases of gastric carcinoma and corresponding paracancerous tissues were selected to construct a tissue microarray. High iron diamine/alcian blue (HID/AB) staining and Hematoxylin and Eosin (HE) staining was used to classify IM and gastric carcinoma, and the expression of COX-2 protein detected in different subtypes of IM and gastric cancer by using immunohistochemistry. Results: The positive expression rate of COX-2 was 45.65%, 59.38% and 77.27% in IM foci in CAG, IM foci in paracancerous tissues, and intestinal-type gastric carcinoma, respectively, significantly higher than in diffuse-type gastric cancer (16.67%)(P<0.05, 0.005 and 0.005, respectively), and the expression intensity of COX-2 protein showed a increased tendency gradually in the sequence of IM foci in CAG→IM foci in paracancerous tissues→intestinal-type gastric carcinoma (P<0.005). The positive expression rate of COX-2 protein in type Ⅲ IM was significantly higher than in type Ⅰ and type Ⅱ IM (P<0.005 and 0.05, respectively), and the expression intensity also showed a increased tendency gradually from type Ⅰ to type Ⅲ IM (P<0.005). Conclusion: The expression level of COX-2 was increased gradually along with the increase of the risk of malignancy of IM, and its expression level may be a useful index to forecast the risk of malignant potential of IM. COX-2 expression was associated with intestinal-type gastric carcinoma, but it might also have some role in the carcinogenesis of diffuse-type gastric carcinoma.
文摘目的探讨乳酸菌培养上清液(lactobacilli supernatants,LS)处理乳腺癌细胞对顺铂(cisplatin,DDP)敏感性的影响及其机制。方法采用CCK-8和Western blot检测不同浓度DDP(0、1、2、3、4、5μg/m L)和LS(体积分数分别为1%、5%、10%、20%)对三阴性乳腺癌细胞MDA-MB-231增殖和Piwil2基因表达的影响;瞬时转染Piwil2 siRNA沉默MDA-MB-231细胞中Piwil2基因表达,Western blot检测其沉默效果,CCK-8检测Piwil2基因沉默后对MDA-MB-231细胞增殖的影响;2μg/m L DDP联合不同浓度LS(体积分数分别为1%、5%、10%、20%)作用MDA-MB-231细胞,观察细胞增殖抑制效应和Piwil2蛋白表达的改变。结果高浓度DDP(≥3μg/m L)可抑制MDA-MB-231细胞的增殖(P<0.05),而低浓度DDP(≤2μg/m L)不能有效抑制细胞增殖;DDP以剂量依赖性方式上调Piwil2蛋白的表达;siRNA沉默Piwil2表达可恢复2μg/m L DDP对细胞增殖的抑制。与对照组(乳酸菌培养基,MRS)比较,LS以剂量依赖性方式下调Piwil2蛋白的表达,但并不影响细胞的增殖;与单用2μg/m L DDP比较,2μg/m L DDP联合20%LS处理可显著下调Piwil2蛋白的表达并抑制细胞增殖(P<0.05)。结论三阴性乳腺癌细胞中Piwil2的高表达可导致细胞对顺铂敏感性的降低,乳酸菌培养上清液可通过下调Piwil2基因的表达增强三阴性乳腺癌细胞对顺铂的敏感性。
