目的探讨缺氧条件下TG2在骨肉瘤MG-63细胞凋亡中的作用以及TG2通过阻止细胞色素C的释放和调节Caspase-3的表达及活性抑制细胞凋亡的机制。方法建立骨肉瘤细胞体外缺氧培养模型,设立四组:(1)常氧组;(2)单纯缺氧组;(3)对照si RNA缺氧组;(4...目的探讨缺氧条件下TG2在骨肉瘤MG-63细胞凋亡中的作用以及TG2通过阻止细胞色素C的释放和调节Caspase-3的表达及活性抑制细胞凋亡的机制。方法建立骨肉瘤细胞体外缺氧培养模型,设立四组:(1)常氧组;(2)单纯缺氧组;(3)对照si RNA缺氧组;(4)TG2 si RNA缺氧组。观察各组在缺氧培养不同时相(6、12、24、48、72 h)骨肉瘤MG-63细胞TG2、Caspase-3表达、胞核和胞质细胞色素C的变化以及细胞凋亡率。结果与常氧组比较,单纯缺氧组及对照si RNA缺氧组的TG2活性、m RNA及蛋白表达水平明显增强(P<0.01),且随缺氧时间延长明显升高;Caspase-3活性未见明显增加,而Caspase-3及细胞质内细胞色素C蛋白的表达水平和细胞凋亡率轻度增加。与前三组比较,在TG2 si RNA缺氧组,当通过转染TG2 si RNA抑制TG2的表达时,Caspase-3的活性及胞质内细胞色素C蛋白表达水平明显增强(P<0.01);细胞凋亡率也显著增加(P<0.01)。结论缺氧条件下,MG-63骨肉瘤细胞TG2表达增强,并且可以阻止细胞核内细胞色素C向胞质释放,从而降低Caspase-3的表达及活性,抑制肿瘤细胞的凋亡。展开更多
Objective: To observe effects of herbal cake-separated moxibustion on blood lipids, including total cholesterol (TCh), triglyceride (TG), high density lipoprotein-Ch (HDL-Ch), low density lipoprotein-Ch (LDL-Ch), apol...Objective: To observe effects of herbal cake-separated moxibustion on blood lipids, including total cholesterol (TCh), triglyceride (TG), high density lipoprotein-Ch (HDL-Ch), low density lipoprotein-Ch (LDL-Ch), apolipoprotein A (Apo A), apolipoprotein B (Apo B), and plasma thromboxane B2 (TXB2) and 6-keto-prostaglandin F 1α (6-keto-PGF 1α) contents and analyse its mechanism. Methods: The hyperlipemia rabbit model was established by breeding of high fat forage and injection of bovine serum albumin. They were treated respectively by direct moxibustion and herbal cake-separated moxibustion at Juque (巨阙 CV 14), Tianshu (天枢 ST 25), Fenglong (丰隆 ST 40), etc., once daily, continuously for 40 days. Blood TCh and TG contents were detected with enzymatic method, LDL-Ch and HDL-Ch with colorimetric method, Apo A and Apo B with electrophoretic method, and TXB2 and 6-keto-PGF 1α with radioimmunoassay. Results: Both the herbal cake-separated moxibustion and direct moxibustion could effectively decrease TCh, TG, LDL-Ch, Apo B and TXB2 contents and TXB2/6-keto-PGF 1α, and increase HDL-CH and 6-keto-PGF 1α contents in the rabbit of hyperlipemia. Conclusion: 6-keto-PGF 1α and TXB2 are possibly involved in the mechanism of herbal cake-separated moxibustion decreasing blood lipids.展开更多
文摘目的:了解组织型转谷氨酰胺酶2(tissue transglutaminase 2,TG2)在胃中的表达情况及其临床意义,为寻找早期诊断胃癌相关的分子标志物提供实验依据.方法:采用RT-PCR和Western blot检测TG2在胃癌组织中的表达;应用免疫组织化学染色检测TG2在胃癌组织中的表达,并分析其在胃癌组织中表达的临床病理学意义.结果:(1)RT-PCR和Western blot结果均显示,TG2在正常胃黏膜和胃癌组织中的表达强度分别为0.274±0.051 vs 0.671±0.105和0.317±0.032 vs 0.918±0.117,与正常胃黏膜组织比较,TG2在胃癌组织中的表达明显增加(P<0.05);(2)免疫组织化学染色结果显示,TG2蛋白在正常胃黏膜和胃癌组织中的阳性表达率分别为33.33%(8/24)和71.74%(33/46),胃癌组织中的阳性表达率明显高于正常胃黏膜组织(P<0.05).结论:TG2蛋白高表达与胃癌的发生密切相关.
文摘目的探讨缺氧条件下TG2在骨肉瘤MG-63细胞凋亡中的作用以及TG2通过阻止细胞色素C的释放和调节Caspase-3的表达及活性抑制细胞凋亡的机制。方法建立骨肉瘤细胞体外缺氧培养模型,设立四组:(1)常氧组;(2)单纯缺氧组;(3)对照si RNA缺氧组;(4)TG2 si RNA缺氧组。观察各组在缺氧培养不同时相(6、12、24、48、72 h)骨肉瘤MG-63细胞TG2、Caspase-3表达、胞核和胞质细胞色素C的变化以及细胞凋亡率。结果与常氧组比较,单纯缺氧组及对照si RNA缺氧组的TG2活性、m RNA及蛋白表达水平明显增强(P<0.01),且随缺氧时间延长明显升高;Caspase-3活性未见明显增加,而Caspase-3及细胞质内细胞色素C蛋白的表达水平和细胞凋亡率轻度增加。与前三组比较,在TG2 si RNA缺氧组,当通过转染TG2 si RNA抑制TG2的表达时,Caspase-3的活性及胞质内细胞色素C蛋白表达水平明显增强(P<0.01);细胞凋亡率也显著增加(P<0.01)。结论缺氧条件下,MG-63骨肉瘤细胞TG2表达增强,并且可以阻止细胞核内细胞色素C向胞质释放,从而降低Caspase-3的表达及活性,抑制肿瘤细胞的凋亡。
文摘Objective: To observe effects of herbal cake-separated moxibustion on blood lipids, including total cholesterol (TCh), triglyceride (TG), high density lipoprotein-Ch (HDL-Ch), low density lipoprotein-Ch (LDL-Ch), apolipoprotein A (Apo A), apolipoprotein B (Apo B), and plasma thromboxane B2 (TXB2) and 6-keto-prostaglandin F 1α (6-keto-PGF 1α) contents and analyse its mechanism. Methods: The hyperlipemia rabbit model was established by breeding of high fat forage and injection of bovine serum albumin. They were treated respectively by direct moxibustion and herbal cake-separated moxibustion at Juque (巨阙 CV 14), Tianshu (天枢 ST 25), Fenglong (丰隆 ST 40), etc., once daily, continuously for 40 days. Blood TCh and TG contents were detected with enzymatic method, LDL-Ch and HDL-Ch with colorimetric method, Apo A and Apo B with electrophoretic method, and TXB2 and 6-keto-PGF 1α with radioimmunoassay. Results: Both the herbal cake-separated moxibustion and direct moxibustion could effectively decrease TCh, TG, LDL-Ch, Apo B and TXB2 contents and TXB2/6-keto-PGF 1α, and increase HDL-CH and 6-keto-PGF 1α contents in the rabbit of hyperlipemia. Conclusion: 6-keto-PGF 1α and TXB2 are possibly involved in the mechanism of herbal cake-separated moxibustion decreasing blood lipids.
