兔角膜上皮细胞摄取生物素:钠依赖性复合维生素转运体(SMVT)的作用。
文章的细节
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引用
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Janoria KG, Hariharan S, Paturi D, Pal D, Mitra AK
兔角膜上皮细胞摄取生物素:钠依赖性复合维生素转运体(SMVT)的作用。
Curr Eye res 2006 10月31日(10):797-809。
- PubMed ID
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17038304 (PubMed视图]
- 摘要
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目的:研究钠依赖性复合维生素转运体(SMVT)在兔角膜上皮细胞中的存在。方法:用原代培养的兔角膜上皮细胞(rPCECs)和新鲜切除的兔角膜分别对生物素的摄取和转运进行表征。采用逆转录-聚合酶链式反应(RT-PCR)鉴定SMVT的分子特征。采用液相色谱/串联质谱法(LC-MS/MS)检测兔眼泪中生物素的存在。结果:rPCECs对生物素的吸收受时间和浓度的影响,Km为32.52 microM, Vmax为10.43 pmol min- 1 mg protein- 1。泛酸和硫辛酸对生物素有显著的抑制作用。生物素的吸收依赖于能量和Na+,而不依赖于H+和Cl-。戊酸以浓度依赖的方式抑制其摄取,但在生物素甲酯和无游离羧基的生物素存在时影响不大。PKC-和pka介导的通路调节剂对生物素的摄取均无影响,但钙调素抑制剂显著抑制其摄取。通过RT-PCR在rpcc中鉴定了钠依赖性多维生素转运体。 Transport experiments across the rabbit corneas revealed the functional localization of SMVT on the apical side of the cornea, and thereby corroborating with in vitro results with cultured corneal cells. Finally, LC-MS/MS analysis showed the presence of biotin in rabbit tears. CONCLUSIONS: Results obtained from both in vitro and exvivo studies suggest the possible role of SMVT expressed on corneal epithelial cells for the uptake of biotin, which co-transports pantothenic acid and lipoic acid. Further, the presence of biotin in tears suggests the physiological significance of this transporter in rabbit corneal epithelium.
beplay体育安全吗引用本文的药物库数据
- 药物转运蛋白
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药物 转运体 种类 生物 药理作用 行动 生物素 钠依赖性多种维生素转运体 蛋白质 人类 未知的底物细节