AIM： To investigate the relationship between the superoxide dismutase （SOD）, malondialdehyde （MDA） metabolic changes and the gastric carcinogenesis.METHODS： The SOD activity and MDA content were measured in the ...AIM： To investigate the relationship between the superoxide dismutase （SOD）, malondialdehyde （MDA） metabolic changes and the gastric carcinogenesis.METHODS： The SOD activity and MDA content were measured in the gastric tissues from the focus center, peripheral and far-end areas of gastric carcinoma （n = 52） arid gastric ulcer （n = 10）. All the tissues were subjected to routine histological examinations and classifications.RESULTS： The SOD activity was greatly reduced but the MDA content was markedly increased in the center areas of the non-mucous gastric carcinoma （non-MGC）; and the poorly differentiated gastric carcinoma varied. The SOD activity was gradually decreased and the MDA content was gradually increased in the tissues from the focus far-end, peripheral to center areas of non-MGC. Both of the SOD activity and the MDA content were significantly declined and were respectively at same low level in the tissues from the focus center, peripheral, and far-end area with the mucous gastric carcinoma （MGC）. In contrast to the gastric ulcer and grade I or II of non-MGC, the same level of the SOD activity and the MDA content were found in the focus center areas. Between non-MGC （groups A-D） and gastric ulcer （group F）, the differences of SOD activity and MDA content were very noticeable in the gastric tissues from the focus peripheral and far-end areas, in which the SOD activity showed noticeable increase and the MDA content showed noticeable decreasein the gastric ulcer.CONCLUSION： The active free radical reaction in the gastric tissues can induce the carcinogenesis of non-MGC. The utmost low ability of antioxidation in the gastric tissues can induce the carcinogenesis of MGC. The metabolic change of the free radicals centralized mostly in the center of ulcerated lesions only, which suggested the ability of antioxidation was declined only in these lesions. However, the metabolism of free radicals varied significantly and the ability of antioxidation declined not only in the local focus area but also in the abroad gastric tissues with gastric carcinoma.展开更多
目的 探讨血管紧张素Ⅱ（AngⅡ）1型受体拮抗剂（ARB）厄贝沙坦对2型糖尿病大鼠肾组织环氧化酶-2（COX-2）表达的影响及其肾保护的可能机制.方法 将18只实验大鼠随机分成正常对照组（A组）、糖尿病组（B组）、厄贝沙坦治疗组（C组）.6...目的 探讨血管紧张素Ⅱ（AngⅡ）1型受体拮抗剂（ARB）厄贝沙坦对2型糖尿病大鼠肾组织环氧化酶-2（COX-2）表达的影响及其肾保护的可能机制.方法 将18只实验大鼠随机分成正常对照组（A组）、糖尿病组（B组）、厄贝沙坦治疗组（C组）.6周时用免疫组织化学法检测肾脏COX-2、基质金属蛋白酶-9（MMP-9）、基质金属蛋白酶组织抑制物1（TIMP-1）表达,并采用放射免疫法测定尿液前列腺素代谢产物血栓烷素B2（TXB2）、6-酮前列腺素F1α（6-Ket-PGF1α）排泄量.结果 与A组比较,B组大鼠肾脏COX-2、TIMP-1表达明显增强,MMP-9表达减弱（COX-2：0.39±0.02 vs 0.24±0.04,TIMP：0.41±0.03 vs 0.24±0.02,MMP-9：0.24±0.02 vs 0.32±0.02,P＜0.05）;与B组比较,C组COX-2（0.31±0.03）、TIMP-1（0.34±0.02）表达减弱、而MMP-9（0.29±0.03）表达增强（P＜0.05）;B组大鼠尿TXB2[（1313.10±14.03）ng/d]、6-Ket-PGF1α[（1598.00±39.25）ng/d]排泄量明显增加;C组尿TXB2[（658±13.68）ng/d]、6-Ket-PGF1α[（1022±58.04）ng/d]排泄量则较B组明显下降;B组大鼠出现明显蛋白尿及基底膜增厚、系膜外基质增多等病理变化;C组则无明显蛋白尿且病理变化较B组明显减弱.结论 COX-2参与了糖尿病肾病发生、发展病理过程;厄贝沙坦抑制COX-2活性、上调MMP-9、下调TIMP-1是其肾保护的可能机制之一.展开更多
基金Supported by the Youth Science Fund of Guangdong Province Medicine and Hygiene, No. B19960095
文摘AIM： To investigate the relationship between the superoxide dismutase （SOD）, malondialdehyde （MDA） metabolic changes and the gastric carcinogenesis.METHODS： The SOD activity and MDA content were measured in the gastric tissues from the focus center, peripheral and far-end areas of gastric carcinoma （n = 52） arid gastric ulcer （n = 10）. All the tissues were subjected to routine histological examinations and classifications.RESULTS： The SOD activity was greatly reduced but the MDA content was markedly increased in the center areas of the non-mucous gastric carcinoma （non-MGC）; and the poorly differentiated gastric carcinoma varied. The SOD activity was gradually decreased and the MDA content was gradually increased in the tissues from the focus far-end, peripheral to center areas of non-MGC. Both of the SOD activity and the MDA content were significantly declined and were respectively at same low level in the tissues from the focus center, peripheral, and far-end area with the mucous gastric carcinoma （MGC）. In contrast to the gastric ulcer and grade I or II of non-MGC, the same level of the SOD activity and the MDA content were found in the focus center areas. Between non-MGC （groups A-D） and gastric ulcer （group F）, the differences of SOD activity and MDA content were very noticeable in the gastric tissues from the focus peripheral and far-end areas, in which the SOD activity showed noticeable increase and the MDA content showed noticeable decreasein the gastric ulcer.CONCLUSION： The active free radical reaction in the gastric tissues can induce the carcinogenesis of non-MGC. The utmost low ability of antioxidation in the gastric tissues can induce the carcinogenesis of MGC. The metabolic change of the free radicals centralized mostly in the center of ulcerated lesions only, which suggested the ability of antioxidation was declined only in these lesions. However, the metabolism of free radicals varied significantly and the ability of antioxidation declined not only in the local focus area but also in the abroad gastric tissues with gastric carcinoma.
文摘目的 探讨血管紧张素Ⅱ（AngⅡ）1型受体拮抗剂（ARB）厄贝沙坦对2型糖尿病大鼠肾组织环氧化酶-2（COX-2）表达的影响及其肾保护的可能机制.方法 将18只实验大鼠随机分成正常对照组（A组）、糖尿病组（B组）、厄贝沙坦治疗组（C组）.6周时用免疫组织化学法检测肾脏COX-2、基质金属蛋白酶-9（MMP-9）、基质金属蛋白酶组织抑制物1（TIMP-1）表达,并采用放射免疫法测定尿液前列腺素代谢产物血栓烷素B2（TXB2）、6-酮前列腺素F1α（6-Ket-PGF1α）排泄量.结果 与A组比较,B组大鼠肾脏COX-2、TIMP-1表达明显增强,MMP-9表达减弱（COX-2：0.39±0.02 vs 0.24±0.04,TIMP：0.41±0.03 vs 0.24±0.02,MMP-9：0.24±0.02 vs 0.32±0.02,P＜0.05）;与B组比较,C组COX-2（0.31±0.03）、TIMP-1（0.34±0.02）表达减弱、而MMP-9（0.29±0.03）表达增强（P＜0.05）;B组大鼠尿TXB2[（1313.10±14.03）ng/d]、6-Ket-PGF1α[（1598.00±39.25）ng/d]排泄量明显增加;C组尿TXB2[（658±13.68）ng/d]、6-Ket-PGF1α[（1022±58.04）ng/d]排泄量则较B组明显下降;B组大鼠出现明显蛋白尿及基底膜增厚、系膜外基质增多等病理变化;C组则无明显蛋白尿且病理变化较B组明显减弱.结论 COX-2参与了糖尿病肾病发生、发展病理过程;厄贝沙坦抑制COX-2活性、上调MMP-9、下调TIMP-1是其肾保护的可能机制之一.
