Regional expression of multidrug resistance genes in genetically epilepsy-prone rat brain after a single audiogenic seizure.

Abstract:

PURPOSE:The multidrug resistance (mdr) gene family encodes the drug transport macromolecule P-glycoprotein (P-gp), which contributes to the functionality of the blood-brain barrier. Recent evidence suggests that P-gp-mediated drug extrusion may play a facilitatory role in refractory epilepsy. We investigated the regional expression of mdr genes in genetically epilepsy-prone rat (GEPR) brain after a single audiogenic seizure. METHODS:Three groups of adult male GEPRs (n = 5/group) were exposed to a seizure-inducing audiogenic stimulus and killed at 4 h, 24 h, and 7 days thereafter. A further group (n = 5) served as a stimulus-naïve control. Expression of mdr1a and mdr1b in distinct anatomic brain regions (cortex, midbrain, pons/medulla, hippocampus) was determined by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) in the presence of competitive internal standards. RESULTS:When compared with control, mdr1a expression in cortex and midbrain was significantly (p < 0.05) increased at 24 h after a single audiogenic seizure. Cortical mdr1a expression remained elevated at 7 days after stimulus. In contrast, mdr1a expression in pons/medulla and hippocampus was unchanged. The mdr1b isoform was quantifiable in hippocampus alone and not influenced by seizure activity. CONCLUSIONS:These findings suggest that acute seizures in the GEPR can induce the expression of mdr genes. The pattern of increased expression appears to follow the anatomic pathway of audiogenic seizures in these animals, with initiation in the midbrain and propagation to the cortex. Further studies are required to investigate the effects of recurrent seizure activity and to characterise mdr expression in other experimental seizure models.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Kwan P,Sills GJ,Butler E,Gant TW,Meldrum BS,Brodie MJ

doi

10.1046/j.1528-1157.2002.156702.x

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

1318-23

issue

11

eissn

0013-9580

issn

1528-1167

pii

epi156702

journal_volume

43

pub_type

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