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Effect of Subchronic Intravenous Morphine Infusion and Naloxone-Precipitated Morphine Withdrawal on P-gp and Bcrp at the Rat Blood-Brain Barrier.

Authors: Chaves, C  Gomez-Zepeda, D  Auvity, S  Menet, MC  Crete, D  Labat, L  Remiao, F  Cisternino, S  Decleves, X 
Citation: Chaves C, etal., J Pharm Sci. 2015 Nov 10. doi: 10.1002/jps.24697.
Pubmed: (View Article at PubMed) PMID:26554626
DOI: Full-text: DOI:10.1002/jps.24697

Chronic morphine regimen increases P-glycoprotein (P-gp) and breast cancer-resistance protein (Bcrp) expressions at the rat blood-brain barrier (BBB) but what drives this effect is poorly understood. The objective of this study is to assess subchronic continuous morphine infusion and naloxone-precipitated morphine withdrawal effects on P-gp/Bcrp contents and activities at the rat BBB. Rats were treated either with (i) a continuous i.v. morphine for 120 h, (ii) escalating morphine dosing (10-40 mg/kg, i.p., 5 days), (iii) a chronic morphine regimen (10 mg/kg s.c., 5 days) followed by a withdrawal period (2 days) and treatment for 3 additional days. Animal behavior was assessed after naloxone-precipitated withdrawal (1 mg/kg, s.c.). P-gp/Bcrp expressions and activities were determined in brain microvessels by qRT-PCR, Western blot, UHPLC-MS/MS, and in situ brain perfusion of P-gp or Bcrp substrates. Results show continuous i.v. morphine did not change P-gp/Bcrp protein levels in rat brain microvessels, whereas naloxone-precipitated withdrawal after escalating or chronic morphine dose regimen increased Mdr1a and Bcrp mRNA levels by 1.4-fold and 2.4-fold, respectively. Conversely, P-gp/Bcrp protein expressions remained unchanged after naloxone administration, and brain uptake of [3 H]-verapamil (P-gp) and [3 H]-mitoxantrone (Bcrp) was not altered. The study concludes subchronic morphine infusion and naloxone-precipitated morphine withdrawal have poor effect on P-gp/Bcrp levels at the rat BBB. (c) 2015 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci.

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CRRD Object Information
CRRD ID: 11041102
Created: 2016-03-21
Species: All species
Last Modified: 2016-03-21
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.