AIM： To investigate the possible involvement of 25-hydroxyvitamin D3-1cx-hydroxylase [1α-25（OH）2D3] in butyrate-induced differentiation in human intestinal cell line Caco-2 cells. METHODS： Caco-2 cells were incub...AIM： To investigate the possible involvement of 25-hydroxyvitamin D3-1cx-hydroxylase [1α-25（OH）2D3] in butyrate-induced differentiation in human intestinal cell line Caco-2 cells. METHODS： Caco-2 cells were incubated either with 3 mmol/L butyrate and 1 umol/L 25（OH）2D3 or with 1 umol/L 1α-25（OH）2D3 for various time intervals ranging from 0 to 72 h. Additionally, cells were co-incubated with butyrate and either 25（OH）2D3 or 1α-25（OH）2D3. 1α-25（OH）2D3 mRNA was determined semi-quantitatively using the fluorescent dye PicoGreen. Immunoblotting was used for the detection of 1α-25（OH）2D3 protein. Finally, enzymatic activity was measured by ELISA. RESULTS： Both butyrate and 1α-25（OH）2D3 stimulated differentiation of Caco-2 cells after a 48 h incubation period, while 25（OH）2D3 had no impact on cell differentiation. Synergistic effects on differentiation were observed when cells were co-incubated with butyrate and vitamin D metabolite. Butyrate transiently upregulated 1α-25（OH）2D3 mRNA followed by a timely delayed protein upregulation. Coincidently, enzymatic activity was enhanced significantly. The induction of the enzyme allowed for comparable differentiating effects of both vitamin D metabolites. CONCLUSION： Our experimental data provide a further mechanism for the involvement of the vitamin D signaling pathway in colonic epithelial cell differentiation by butyrate. The enhancement of 1α-25（OH）2D3 followed by antiproliferative effects of the vitamin D prohormone in the Caco-2 cell line suggest that 25（OH）2D3 in combination with butyrate may offer a new therapeutic approach forthe treatment of colon cancer.展开更多
目的了解2型糖尿病患者血清25-羟维生素D(25-hydroxylvitamin D,25OHD)营养状况及其与骨密度(bone mineral density,BMD)的关系。方法选择2015年2月-2017年3月在北京同仁医院住院的2型糖尿病患者716例(男性410例,女性306例),年龄32~93岁...目的了解2型糖尿病患者血清25-羟维生素D(25-hydroxylvitamin D,25OHD)营养状况及其与骨密度(bone mineral density,BMD)的关系。方法选择2015年2月-2017年3月在北京同仁医院住院的2型糖尿病患者716例(男性410例,女性306例),年龄32~93岁,平均年龄(58.78±11.31)岁,检测血清25OHD水平,应用双能X线吸收检测法测定腰1-4、全髋及股骨颈的BMD。结果在716例2型糖尿病患者中,维生素D严重缺乏者为230例(32.1%),缺乏357例(49.9%),不足97例(13.5%),充足仅32例(4.5%)。不同年龄组别中,血清25OHD水平以及缺乏程度差异均无统计学意义(P>0.05)。Logistic回归分析显示年龄增长、女性及维生素D缺乏为2型糖尿病患者发生骨质疏松的危险因素。结论 2型糖尿病患者维生素D缺乏严重,女性更为明显。血清25OHD缺乏程度越重,骨质疏松的发生风险越高。展开更多
基金Supported by the Else Kroner-Fresenius Foundation, Bad Homburg, Germany
文摘AIM： To investigate the possible involvement of 25-hydroxyvitamin D3-1cx-hydroxylase [1α-25（OH）2D3] in butyrate-induced differentiation in human intestinal cell line Caco-2 cells. METHODS： Caco-2 cells were incubated either with 3 mmol/L butyrate and 1 umol/L 25（OH）2D3 or with 1 umol/L 1α-25（OH）2D3 for various time intervals ranging from 0 to 72 h. Additionally, cells were co-incubated with butyrate and either 25（OH）2D3 or 1α-25（OH）2D3. 1α-25（OH）2D3 mRNA was determined semi-quantitatively using the fluorescent dye PicoGreen. Immunoblotting was used for the detection of 1α-25（OH）2D3 protein. Finally, enzymatic activity was measured by ELISA. RESULTS： Both butyrate and 1α-25（OH）2D3 stimulated differentiation of Caco-2 cells after a 48 h incubation period, while 25（OH）2D3 had no impact on cell differentiation. Synergistic effects on differentiation were observed when cells were co-incubated with butyrate and vitamin D metabolite. Butyrate transiently upregulated 1α-25（OH）2D3 mRNA followed by a timely delayed protein upregulation. Coincidently, enzymatic activity was enhanced significantly. The induction of the enzyme allowed for comparable differentiating effects of both vitamin D metabolites. CONCLUSION： Our experimental data provide a further mechanism for the involvement of the vitamin D signaling pathway in colonic epithelial cell differentiation by butyrate. The enhancement of 1α-25（OH）2D3 followed by antiproliferative effects of the vitamin D prohormone in the Caco-2 cell line suggest that 25（OH）2D3 in combination with butyrate may offer a new therapeutic approach forthe treatment of colon cancer.
文摘目的了解2型糖尿病患者血清25-羟维生素D(25-hydroxylvitamin D,25OHD)营养状况及其与骨密度(bone mineral density,BMD)的关系。方法选择2015年2月-2017年3月在北京同仁医院住院的2型糖尿病患者716例(男性410例,女性306例),年龄32~93岁,平均年龄(58.78±11.31)岁,检测血清25OHD水平,应用双能X线吸收检测法测定腰1-4、全髋及股骨颈的BMD。结果在716例2型糖尿病患者中,维生素D严重缺乏者为230例(32.1%),缺乏357例(49.9%),不足97例(13.5%),充足仅32例(4.5%)。不同年龄组别中,血清25OHD水平以及缺乏程度差异均无统计学意义(P>0.05)。Logistic回归分析显示年龄增长、女性及维生素D缺乏为2型糖尿病患者发生骨质疏松的危险因素。结论 2型糖尿病患者维生素D缺乏严重,女性更为明显。血清25OHD缺乏程度越重,骨质疏松的发生风险越高。
