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Opiates inhibit paclitaxel uptake by P-glycoprotein in preparations of human placental inside-out vesicles.

Abstract：

:The use of either methadone or buprenorphine for treatment of the pregnant opiate-dependent patient improves maternal and neonatal outcome. However, patient outcomes are often complicated by neonatal abstinence syndrome (NAS). The incidence and severity of NAS should depend on opiate concentration in the fetal circulation. Efflux transporters expressed in human placental brush border membranes decrease fetal exposure to medications by their extrusion to the maternal circulation. Accordingly, the concentration of either methadone or buprenorphine in the fetal circulation is, in part, dependent on the activity of the efflux transporters. The objective of this study was to characterize the activity of P-gp and its interaction with opiates in the placental apical membrane. Therefore, brush border membrane vesicles were prepared from human placenta. The vesicles were oriented approximately 75% inside-out, exhibited saturable ATP-dependent uptake of P-gp substrate [(3)H]-paclitaxel with an apparent K(t) of 66+/-38 nM and V(max) of 20+/-3 pmol mg protein (-1)min(-1). Methadone, buprenorphine, and morphine inhibited paclitaxel transport with apparent K(i) of 18, 44, and 90 microM, respectively. Our data indicate that a method has been established to determine the activity of the efflux transporter P-gp, expressed in placental brush border membranes, and the kinetics for the transfer of its prototypic substrate paclitaxel. Furthermore, the method was used to determine the effects of methadone, buprenorphine, and morphine on paclitaxel transfer by placental P-gp and revealed that they have higher affinity to the transporter than its classical inhibitor verapamil (K(i), 300 microM).

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Hemauer SJ,Patrikeeva SL,Nanovskaya TN,Hankins GD,Ahmed MS

doi

10.1016/j.bcp.2009.07.002

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

1272-8

issue

9

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(09)00602-9

journal_volume

78

pub_type

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