目的:以大鼠脑缺血再灌注损伤模型为研究对象,探讨红花注射液对大鼠大脑皮质B细胞淋巴瘤-2(B-cell leukemia-2,Bcl-2)蛋白、Bcl-2相关X蛋白(Bcl-2 associated x protein,Bax)、Bcl-XL(B-cell lymphomaextra large)蛋白表达的影响。方法...目的:以大鼠脑缺血再灌注损伤模型为研究对象,探讨红花注射液对大鼠大脑皮质B细胞淋巴瘤-2(B-cell leukemia-2,Bcl-2)蛋白、Bcl-2相关X蛋白(Bcl-2 associated x protein,Bax)、Bcl-XL(B-cell lymphomaextra large)蛋白表达的影响。方法:健康成年雄性SD大鼠30只,随机分为6组,分别为假手术组(生理盐水1.6 m L·kg-1),模型组(生理盐水1.6 m L·kg-1),红花注射液低剂量组(0.8 m L·kg-1)、中剂量组(1.6 m L·kg-1)、高剂量组(3.2 m L·kg-1)及尼莫地平组(2.0 m L·kg-1)。采用线栓法建立大鼠局灶性脑缺血再灌注损伤模型,采用免疫组织化学方法检测大鼠脑皮质Bax、Bcl-2、Bcl-XL蛋白的表达。结果:模型组脑组织缺血周边区域中Bax、Bcl-2、Bcl-XL阳性细胞表达较假手术组明显增加(P<0.05);而与模型组比较,红花注射液低、中、高剂量组和尼莫地平注射液组脑组织缺血周边区域中Bax阳性细胞表达明显减少(P<0.05),而Bcl-2、Bcl-XL阳性细胞表达均明显增加(P<0.05)。结论:红花注射液可通过增加Bcl-2、Bcl-XL蛋白及下调Bax蛋白的表达减少大脑神经细胞凋亡,对缺血再灌注损伤大鼠脑组织发挥保护作用。展开更多
AIM: To evaluate of Cx26 in correlation with Bcl-xL and Bax proteins in colorectal cancer.METHODS: Immunohistochemical staining using specific antibodies was performed to evaluate the protein expression of Cx26, Bax a...AIM: To evaluate of Cx26 in correlation with Bcl-xL and Bax proteins in colorectal cancer.METHODS: Immunohistochemical staining using specific antibodies was performed to evaluate the protein expression of Cx26, Bax and Bcl-xL in 152 colorectal cancer samples and the correlations among studied proteins as well as the relationships between the expression of Cx26,Bax, Bcl-xL and clinicopathological features were analyzed.RESULTS: Both normal epithelial cells and carcinoma cells expressed Cx26, Bax and Bcl-xL, but Cx26 in cancer cells showed aberrant, mainly cytoplasmic staining. Expression of Cx26, Bax and Bcl-xL was observed in 55.9%, 55.5%and 72.4% of evaluated colorectal cancers respectively.We found the positive correlation between Cx26 and Bax expression (r = 0.561, P＜0.0001), Cx26 and Bcl-xL (r = 0.409, P＜0.0001) as well as between Bax and Bcl-xL (r = 0.486, P＜0.0001). Association of Cx26, Bax and Bcl-xL expression with histological G2 grade of tumors was noted (P＜0.005, P＜0.001 and P＜0.002 respectively).CONCLUSION: Cytoplasmic presence of Cx26 and its association with apoptotic markers could indicate a distinct role from physiological functions of Cx26 in cancer cells and it could suggest that connexins might be a target point for modulations of apoptosis with therapeutic implications.展开更多
AIM: To evaluate the expression of Bcl-xL, Bak, and Bax proteins in correlation with particular clinico-histopathological parameters, including tumor invasion front, in patients with colorectal cancer. METHODS: The ex...AIM: To evaluate the expression of Bcl-xL, Bak, and Bax proteins in correlation with particular clinico-histopathological parameters, including tumor invasion front, in patients with colorectal cancer. METHODS: The expression of these proteins was evaluated with the use of the immunohistochemical method in 50 primary tumors. RESULTS: According to observations, a low expression of Bax and Bak proteins is related to the localization of the tumor in the rectum(P < 0.05 and P < 0.05 respectively), which may explain an increased incidence of colorectal cancer in this area. A positive expression of Bax protein also correlates with the presence of cancer cell infiltration to lymph and blood vessels(P < 0.05), which may suggest the participation of this protein in the early stages of colorectal cancer progression. Moreover, a positive expression of Bcl-xL protein correlated with a positive expression of Bak protein. This may suggest a greater participation of Bcl-xL protein in the inhibition of the proapoptotic Bak protein, but not the Bax protein. CONCLUSION: Bax protein is probably very significant in the cancerogenesis mechanism in the large intestine.展开更多
文摘目的:以大鼠脑缺血再灌注损伤模型为研究对象,探讨红花注射液对大鼠大脑皮质B细胞淋巴瘤-2(B-cell leukemia-2,Bcl-2)蛋白、Bcl-2相关X蛋白(Bcl-2 associated x protein,Bax)、Bcl-XL(B-cell lymphomaextra large)蛋白表达的影响。方法:健康成年雄性SD大鼠30只,随机分为6组,分别为假手术组(生理盐水1.6 m L·kg-1),模型组(生理盐水1.6 m L·kg-1),红花注射液低剂量组(0.8 m L·kg-1)、中剂量组(1.6 m L·kg-1)、高剂量组(3.2 m L·kg-1)及尼莫地平组(2.0 m L·kg-1)。采用线栓法建立大鼠局灶性脑缺血再灌注损伤模型,采用免疫组织化学方法检测大鼠脑皮质Bax、Bcl-2、Bcl-XL蛋白的表达。结果:模型组脑组织缺血周边区域中Bax、Bcl-2、Bcl-XL阳性细胞表达较假手术组明显增加(P<0.05);而与模型组比较,红花注射液低、中、高剂量组和尼莫地平注射液组脑组织缺血周边区域中Bax阳性细胞表达明显减少(P<0.05),而Bcl-2、Bcl-XL阳性细胞表达均明显增加(P<0.05)。结论:红花注射液可通过增加Bcl-2、Bcl-XL蛋白及下调Bax蛋白的表达减少大脑神经细胞凋亡,对缺血再灌注损伤大鼠脑组织发挥保护作用。
基金Supported by the Polish State Committee for Scientific Research (3 PO5B 07922)
文摘AIM: To evaluate of Cx26 in correlation with Bcl-xL and Bax proteins in colorectal cancer.METHODS: Immunohistochemical staining using specific antibodies was performed to evaluate the protein expression of Cx26, Bax and Bcl-xL in 152 colorectal cancer samples and the correlations among studied proteins as well as the relationships between the expression of Cx26,Bax, Bcl-xL and clinicopathological features were analyzed.RESULTS: Both normal epithelial cells and carcinoma cells expressed Cx26, Bax and Bcl-xL, but Cx26 in cancer cells showed aberrant, mainly cytoplasmic staining. Expression of Cx26, Bax and Bcl-xL was observed in 55.9%, 55.5%and 72.4% of evaluated colorectal cancers respectively.We found the positive correlation between Cx26 and Bax expression (r = 0.561, P＜0.0001), Cx26 and Bcl-xL (r = 0.409, P＜0.0001) as well as between Bax and Bcl-xL (r = 0.486, P＜0.0001). Association of Cx26, Bax and Bcl-xL expression with histological G2 grade of tumors was noted (P＜0.005, P＜0.001 and P＜0.002 respectively).CONCLUSION: Cytoplasmic presence of Cx26 and its association with apoptotic markers could indicate a distinct role from physiological functions of Cx26 in cancer cells and it could suggest that connexins might be a target point for modulations of apoptosis with therapeutic implications.
文摘AIM: To evaluate the expression of Bcl-xL, Bak, and Bax proteins in correlation with particular clinico-histopathological parameters, including tumor invasion front, in patients with colorectal cancer. METHODS: The expression of these proteins was evaluated with the use of the immunohistochemical method in 50 primary tumors. RESULTS: According to observations, a low expression of Bax and Bak proteins is related to the localization of the tumor in the rectum(P < 0.05 and P < 0.05 respectively), which may explain an increased incidence of colorectal cancer in this area. A positive expression of Bax protein also correlates with the presence of cancer cell infiltration to lymph and blood vessels(P < 0.05), which may suggest the participation of this protein in the early stages of colorectal cancer progression. Moreover, a positive expression of Bcl-xL protein correlated with a positive expression of Bak protein. This may suggest a greater participation of Bcl-xL protein in the inhibition of the proapoptotic Bak protein, but not the Bax protein. CONCLUSION: Bax protein is probably very significant in the cancerogenesis mechanism in the large intestine.
