目的:观察四君子汤多糖对小肠上皮IEC-6细胞迁移多胺信号通路钙离子调控的影响,探讨四君子汤促进胃肠黏膜损伤修复的作用机制。方法:在IEC-6细胞实验中,设正常对照组,阳性对照组,四君子汤多糖低、中、高剂量组(40、80、160mg/L);负荷实...目的:观察四君子汤多糖对小肠上皮IEC-6细胞迁移多胺信号通路钙离子调控的影响,探讨四君子汤促进胃肠黏膜损伤修复的作用机制。方法:在IEC-6细胞实验中,设正常对照组,阳性对照组,四君子汤多糖低、中、高剂量组(40、80、160mg/L);负荷实验则设模型组(α-二氟甲基鸟氨酸,DFMO),各用药组在加受试药同时加入DFMO;划痕法制造细胞迁移模型;相差倒置显微镜观察细胞迁移情况;HPLC法测定细胞内多胺(精脒和精胺)含量;RT-q PCR和Western Blot法分别检测瞬时受体电位通道1(TRPC1)m RNA和蛋白表达;Western Blot法检测磷脂酶C-γ1(PLC-γ1)蛋白表达;酶联免疫法检测三磷酸肌醇(IP3)含量;流式细胞仪检测细胞内游离钙离子浓度([Ca^(2+)]cyt);无钙培养条件是以不含钙离子的细胞培养液代替常规的含钙细胞培养液。结果:与正常对照组比较,四君子汤多糖各剂量组可促进细胞迁移、增加细胞内精脒和精胺含量、提高TRPC1 m RNA及蛋白表达、提高PLC-γ1蛋白表达和IP3含量、增加[Ca^(2+)]cyt(P<0.05,P<0.01);与模型组比较,四君子汤多糖各剂量组可逆转DFMO所致的细胞迁移抑制、细胞多胺含量降低、TRPC1 m RNA和蛋白表达降低、PLC-γ1蛋白表达和IP3含量降低、[Ca^(2+)]cyt降低(P<0.05,P<0.01);与正常对照组(含钙培养)比较,无钙培养可致细胞迁移抑制(P<0.01);与正常对照组(无钙培养)比较,各剂量四君子汤多糖可改善无钙培养所致的细胞迁移抑制(P<0.05,P<0.01),但不能使细胞迁移恢复正常水平。结论:四君子汤多糖促进细胞迁移与其作用于多胺调控信号通路有关,其中对Ca^(2+)调控是其关键指标。展开更多
Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor ...Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor progression and metastasis of advanced prostate cancer. In the present study, TGF-β1 was shown to induce VEGFA165 secretion from both normal cell lines （HPV7 and RWPE1） and prostate cancer cell lines （DU 145 and PC3）. Conversely, hypoxia-stimulated VEGFA165 secretion was observed only in prostate cancer cell lines. Hypoxia induced TGF-β1 expression in PC3 prostate cancer cells, and the TGF-β1 type I receptor （ALK5） kinase inhibitor partially blocked hypoxia-mediated VEGFA16s secretion. This effect of hypoxia provides a novel mechanism to increase VEGFA expression in prostate cancer cells. Although autocrine signaling of VEGFA has been implicated in prostate cancer progression and metastasis, the associated mechanism is poorly characterized. VEGFA activity is mediated via VEGF receptor （VEGFR） 1 （Fit-l） and 2 （FIk-I/KDR）. Whereas VEGFR-1 mRNA was detected in normal prostate epithelial cells, VEGFR-2 mRNA and VEGFR protein were expressed only in PC3 cells. VEGFA165 treatment induced phosphorylation of extracellular signal-regulated kinase 1/2 （ERKI/2） in PC3 cells but not in HPV7 cells, suggesting that the autocrine function of VEGFA may be uniquely associated with prostate cancer. Activation of VEGFR-2 by VEGFA165 was shown to enhance migration of PC3 cells. A similar effect was also observed with endogenous VEGFA induced by TGF-β1 and hypoxia. These findings illustrate that an autocrine loop of VEGFA via VEGFR-2 is critical for the tumorigenic effects of TGF-β1 and hypoxia on metastatic prostate cancers.展开更多
BACKGROUND Circular RNAs (circRNAs) are considered to be highly stable due to the closed structure, which are predominately correlated with the development and progression of a wide variety of cancers. Colon cancer is...BACKGROUND Circular RNAs (circRNAs) are considered to be highly stable due to the closed structure, which are predominately correlated with the development and progression of a wide variety of cancers. Colon cancer is one of the most common malignancies worldwide. A recent study demonstrated the upregulated expression of circPIP5K1A in non-small cell lung cancer. However, few studies have investigated the relationship between circ_0014130 level and colon cancer. Therefore, elucidating the underlying mechanisms of circPIP5K1A’s role may help with the identification of novel diagnostic and therapeutic targets for colon cancer. AIM To investigate the status of circPIP5K1A in colon cancers and its effects on the modulation of cancer development. METHODS The expression level of circPIP5K1A in tissue and serum samples from colon cancer patients, as well as human colonic cancer cell lines was detected by realtime quantitative reverse transcription-polymerase chain reaction. Following the transfection of specifically synthesized small interfering RNA (siRNA) into colon cell lines, we used Hoechst staining assay to measure the ratio of cell death in the absence of circPIP5K1A. Moreover, we also used the Transwell assay to assess the migratory function of colon cells overexpressing circPIP5K1A. Additionally, we employed a series of bioinformatics prediction programs to predict the potential of circPIP5K1A-targeted miRNAs and mRNAs. The miR-1273a vector was constructed, and then transfected with or without circPIP5K1A vector into colon cancer cells. Afterwards, the expression of activator protein 1 (AP-1), interferon regulating factor 4 (IRF-4), caudal type homeobox 2 (CDX-2), and zinc finger of the cerebellum 1 (Zic-1) was detected by western blotting. RESULTS CircPIP5K1A was significantly upregulated in colon cancer tissue relative to their adjacent normal tissues. Knockdown of circPIP5K1A in colon cancer cells impaired cell viability and suppressed cell invasion and migration, while enforced expression of circPIP5K1A e展开更多
基金This work was supported by the National Institutes of Health (NIH) Grants DK-57819 and DK-61972a Merit Review Grant from US Department of Veterans Affairs (VA).
文摘目的:观察四君子汤多糖对小肠上皮IEC-6细胞迁移多胺信号通路钙离子调控的影响,探讨四君子汤促进胃肠黏膜损伤修复的作用机制。方法:在IEC-6细胞实验中,设正常对照组,阳性对照组,四君子汤多糖低、中、高剂量组(40、80、160mg/L);负荷实验则设模型组(α-二氟甲基鸟氨酸,DFMO),各用药组在加受试药同时加入DFMO;划痕法制造细胞迁移模型;相差倒置显微镜观察细胞迁移情况;HPLC法测定细胞内多胺(精脒和精胺)含量;RT-q PCR和Western Blot法分别检测瞬时受体电位通道1(TRPC1)m RNA和蛋白表达;Western Blot法检测磷脂酶C-γ1(PLC-γ1)蛋白表达;酶联免疫法检测三磷酸肌醇(IP3)含量;流式细胞仪检测细胞内游离钙离子浓度([Ca^(2+)]cyt);无钙培养条件是以不含钙离子的细胞培养液代替常规的含钙细胞培养液。结果:与正常对照组比较,四君子汤多糖各剂量组可促进细胞迁移、增加细胞内精脒和精胺含量、提高TRPC1 m RNA及蛋白表达、提高PLC-γ1蛋白表达和IP3含量、增加[Ca^(2+)]cyt(P<0.05,P<0.01);与模型组比较,四君子汤多糖各剂量组可逆转DFMO所致的细胞迁移抑制、细胞多胺含量降低、TRPC1 m RNA和蛋白表达降低、PLC-γ1蛋白表达和IP3含量降低、[Ca^(2+)]cyt降低(P<0.05,P<0.01);与正常对照组(含钙培养)比较,无钙培养可致细胞迁移抑制(P<0.01);与正常对照组(无钙培养)比较,各剂量四君子汤多糖可改善无钙培养所致的细胞迁移抑制(P<0.05,P<0.01),但不能使细胞迁移恢复正常水平。结论:四君子汤多糖促进细胞迁移与其作用于多胺调控信号通路有关,其中对Ca^(2+)调控是其关键指标。
文摘Hypoxia and transforming growth factor-β1 （TGF-β1） increase vascular endothelial growth factor A （VEGFA） expression in a number of malignancies. This effect of hypoxia and TGF-β1 might be responsible for tumor progression and metastasis of advanced prostate cancer. In the present study, TGF-β1 was shown to induce VEGFA165 secretion from both normal cell lines （HPV7 and RWPE1） and prostate cancer cell lines （DU 145 and PC3）. Conversely, hypoxia-stimulated VEGFA165 secretion was observed only in prostate cancer cell lines. Hypoxia induced TGF-β1 expression in PC3 prostate cancer cells, and the TGF-β1 type I receptor （ALK5） kinase inhibitor partially blocked hypoxia-mediated VEGFA16s secretion. This effect of hypoxia provides a novel mechanism to increase VEGFA expression in prostate cancer cells. Although autocrine signaling of VEGFA has been implicated in prostate cancer progression and metastasis, the associated mechanism is poorly characterized. VEGFA activity is mediated via VEGF receptor （VEGFR） 1 （Fit-l） and 2 （FIk-I/KDR）. Whereas VEGFR-1 mRNA was detected in normal prostate epithelial cells, VEGFR-2 mRNA and VEGFR protein were expressed only in PC3 cells. VEGFA165 treatment induced phosphorylation of extracellular signal-regulated kinase 1/2 （ERKI/2） in PC3 cells but not in HPV7 cells, suggesting that the autocrine function of VEGFA may be uniquely associated with prostate cancer. Activation of VEGFR-2 by VEGFA165 was shown to enhance migration of PC3 cells. A similar effect was also observed with endogenous VEGFA induced by TGF-β1 and hypoxia. These findings illustrate that an autocrine loop of VEGFA via VEGFR-2 is critical for the tumorigenic effects of TGF-β1 and hypoxia on metastatic prostate cancers.
基金Supported by the National Natural Science Foundation of China,No.81703028and Hubei Cancer Hospital,No.20162017B01
文摘BACKGROUND Circular RNAs (circRNAs) are considered to be highly stable due to the closed structure, which are predominately correlated with the development and progression of a wide variety of cancers. Colon cancer is one of the most common malignancies worldwide. A recent study demonstrated the upregulated expression of circPIP5K1A in non-small cell lung cancer. However, few studies have investigated the relationship between circ_0014130 level and colon cancer. Therefore, elucidating the underlying mechanisms of circPIP5K1A’s role may help with the identification of novel diagnostic and therapeutic targets for colon cancer. AIM To investigate the status of circPIP5K1A in colon cancers and its effects on the modulation of cancer development. METHODS The expression level of circPIP5K1A in tissue and serum samples from colon cancer patients, as well as human colonic cancer cell lines was detected by realtime quantitative reverse transcription-polymerase chain reaction. Following the transfection of specifically synthesized small interfering RNA (siRNA) into colon cell lines, we used Hoechst staining assay to measure the ratio of cell death in the absence of circPIP5K1A. Moreover, we also used the Transwell assay to assess the migratory function of colon cells overexpressing circPIP5K1A. Additionally, we employed a series of bioinformatics prediction programs to predict the potential of circPIP5K1A-targeted miRNAs and mRNAs. The miR-1273a vector was constructed, and then transfected with or without circPIP5K1A vector into colon cancer cells. Afterwards, the expression of activator protein 1 (AP-1), interferon regulating factor 4 (IRF-4), caudal type homeobox 2 (CDX-2), and zinc finger of the cerebellum 1 (Zic-1) was detected by western blotting. RESULTS CircPIP5K1A was significantly upregulated in colon cancer tissue relative to their adjacent normal tissues. Knockdown of circPIP5K1A in colon cancer cells impaired cell viability and suppressed cell invasion and migration, while enforced expression of circPIP5K1A e
