A new method to measure intestinal activity of P-glycoprotein in avian and mammalian species

A new method to measure intestinal activity of P-glycoprotein in avian and mammalian species
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测量鸟类和哺乳动物 P-糖蛋白肠道活性的新方法

DOI:
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发表时间:
2004
期刊:
Journal of Comparative Physiology □ B
影响因子:
--
通讯作者:
W. Karasov
W. Karasov
中科院分区:
--
文献类型:
--
作者:
A. K. Green;D. Barnes;W. Karasov

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通透性糖蛋白(PGP)一旦扩散到肠上皮细胞的细胞膜上,就会主动输出许多潜在的有毒化合物。我们采用外翻袖子技术对禽类(鸡)和野生哺乳动物的肠道PGP功能进行了第一次测量,并将它们与实验室大鼠进行了比较。组织保持了结构和功能的完整性,我们的方法比其他体外技术更具优势,因为我们使用了更小的肠道切片(1厘米)和更短的孵育时间(8-12分钟)。为了确定PGP功能,我们比较了在Ringer溶液中孵育的袖子中[~3H]-地高辛的累积,以及没有竞争抑制物环孢素A转运饱和浓度的情况。我们发现PGP活性在沿肠道的个体内、在不同饮食的人群之间以及在物种之间存在显著差异(实验室大鼠的PGP活性是野生啮齿动物的三分之一到五分之一)。在鸡身上,我们还测试了天然代谢物对地高辛积累的影响。我们发现,在黄酮类化合物中,大豆和其他豆类中存在的染料木素(200umμM)显著增加了地高辛的积累,但没有槲皮素(10,30,100,330μM)或3-β-糖苷异槲皮苷(100μM)。在真菌代谢产物中,杂色曲霉毒素(5μM)显著增加地高辛的积累,而黄曲霉毒素B1(5μM)则不显著。
Permeability-glycoprotein (Pgp) actively exports numerous potentially toxic compounds once they diffuse into the cell membrane of intestinal epithelial cells. We adapted the everted sleeve technique to make the first measures of intestinal Pgp function in an avian species (chicken) and in wild mammalian species, and compared them to laboratory rats. Tissues maintained both structural and functional integrity, and our method offers advantages over other in vitro techniques by using smaller intestinal sections (1 cm), and shorter incubation times (8–12 min). To determine Pgp function, we compared accumulation of [3H]-digoxin in sleeves incubated in Ringer solution with and without a transport-saturating concentration of a competitive inhibitor, cyclosporin A. We demonstrated significant variation in Pgp activity within individuals along the intestine, between populations fed different diets, and between species (laboratory rats had one-third to one-fifth the Pgp activity of wild rodents). In chicken, we also tested the effect of natural metabolites on digoxin accumulation. We found that among flavonoids, genistein (200 μM), found in soy and other legumes, but not quercetin (10, 30, 100, 330 μM) or the 3-β-glycoside isoquercetrin (100 μM), significantly increased digoxin accumulation. Among fungal metabolites, sterigmatocystin (5 μM), but not aflatoxin B1 (5 μM), significantly increased digoxin accumulation.
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