期刊
JOURNAL OF NEUROCHEMISTRY
卷 102, 期 5, 页码 1677-1690出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1471-4159.2007.04644.x
关键词
blood-brain barrier; efflux; hyperalgesia; morphine; Pgp; lambda-carrageenan
资金
- NIDA NIH HHS [DA-011271, R01 DA011271, F31 DA-019744] Funding Source: Medline
- NINDS NIH HHS [NS-042652, R01 NS042652, R01 NS-039592] Funding Source: Medline
P-glycoprotein (Pgp, ABCB1) is a critical efflux transporter at the blood-brain barrier (BBB) where its luminal location and substrate promiscuity limit the brain distribution of numerous therapeutics. Moreover, Pgp is known to confer multi-drug resistance in cancer chemotherapy and brain diseases, such as epilepsy, and is highly regulated by inflammatory mediators. The involvement of inflammatory processes in neuropathological states has led us to investigate the effects of peripheral inflammatory hyperalgesia on transport properties at the BBB. In the present study, we examined the effects of,lambda-carrageenan-induced inflammatory pain (CIP) on brain endothelium regulation of Pgp. Western blot analysis of enriched brain microvessel fractions showed increased Pgp expression 3 h post-CIP. In situ brain perfusion studies paralleled these findings with decreased brain uptake of the Pgp substrate and opiate analgesic, [H-3] morphine. Cyclosporin A-mediated inhibition of Pgp enhanced the uptake of morphine in lambda-carrageenan and control animals. This indicates that the CIP induced decrease in morphine transport was the result of an increase in Pgp activity at the BBB. Furthermore, antinociception studies showed decreased morphine analgesia following CIP. The observation that CIP modulates Pgp at the BBB in vivo is critical to understanding BBB regulation during inflammatory disease states.
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