首页> 美国卫生研究院文献>Biochemistry and Biophysics Reports >Effects of perfluoroalkyl carboxylic acids on the uptake of sulfobromophthalein via organic anion transporting polypeptides in human intestinal Caco-2 cells
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Effects of perfluoroalkyl carboxylic acids on the uptake of sulfobromophthalein via organic anion transporting polypeptides in human intestinal Caco-2 cells

机译:全氟烷基羧酸对人肠道Caco-2细胞的有机阴离子输送多肽的磺溴硫氨酰的吸收的影响

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摘要

We performed a detailed investigation of the uptake of sulfobromophthalein (BSP) from the apical membrane of Caco-2 cells, which is a substrate for organic anion transporting polypeptides (OATPs), and calculated the kinetic parameters of BSP uptake as follows: Km = 13.9 ± 1.3 μM, Vmax = 1.15 ± 0.07 nmol (mg protein)−1 (5 min)−1, and kd = 38.2 ± 0.53 μL (mg protein)−1 (5 min)−1. Coincubation with medium-chain (C7–C11) perfluoroalkyl carboxylic acids (PFCAs), such as perfluoroheptanoic acid (PFHpA, C7), perfluorooctanoic acid (PFOA, C8), perfluorononanoic acid (PFNA, C9), perfluorodecanoic acid (PFDA, C10) and perfluoroundecanoic acid (PFUnDA, C11), significantly decreased BSP uptake by 27–55%, while coincubation with short- (C3–C6) and long-chain (C12–C14) PFCAs decreased the uptake only slightly. Dixon plotting suggested that PFOA, PFNA and PFDA competitively inhibited the BSP uptake with inhibition constant (Ki) values of 62.2 ± 1.3 μM, 35.3 ± 0.1 μM and 43.2 ± 0.3 μM, respectively. PFCAs with medium-chains could be substrates for OATPs, probably OATP2B1, which is the most abundantly expressed OATP isoform in Caco-2 cells.
机译:我们对CaCo-2细胞的顶端膜进行了对磺铬酞素(BSP)的摄取的详细研究,其是用于有机阴离子输送多肽(OATP)的基材,并计算BSP吸收的动力学参数,如下所示:KM = 13.9 ±1.3μm,vmax = 1.15±0.07 nmol(mg蛋白)-1(5 min)-1,kd = 38.2±0.53μl(mg蛋白质)-1(5 min)-1。与中链(C7-C11)全氟烷基羧酸(PFCA)等辛酸,如全氟庚酸(PFHPA,C7),全氟辛酸(PFOA,C8),全氟乙酸(PFNA,C9),全氟二癸酸(PFDA,C10)和全氟烷己酸(Pfunda,C11),BSP吸收率显着降低27-55%,而短 - (C3-C6)和长链(C12-C14)PFCA仅略微降低摄取。 Dixon Ploting表明PFOA,PFNA和PFDA竞争性地抑制BSP吸收,抑制常数(ki)值分别为62.2±1.3μm,35.3±0.1μm和43.2±0.3μm。具有中链的PFCA可以是OATPS的基质,可能是OATP2B1,其是Caco-2细胞中最丰富的OATP同种型。

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