Vascular and parenchymal mechanisms in multiple drug resistance: a lesson from human epilepsy.

Abstract:

:Long term treatment with antiepileptic drugs (AEDs) is the standard therapeutic approach to eradicate seizures. However, a small but significant number of patients fail AED treatment. Intrinsic drug resistance may depend on two main and not necessarily mutually exclusive mechanisms: 1) Loss of pharmacological target (e.g., GABAA receptors); 2) poor penetration of the drug into the central nervous system (CNS). The latter is due to the action of multiple drug resistance proteins capable of active CNS extrusion of drugs. These include MDR1 (P-glycoprotein, PgP), the multidrug resistance related proteins MRP1-5, and lung-resistance protein (LRP). Overexpression of MDR1 occurs in human epileptic brain. It has therefore been proposed that MDR1/PgP may contribute to multiple drug resistance in epilepsy. In addition to MDR1/PgP, other genes such as MRP2, MRP5, and human cisplatin resistance-associated protein are also overexpressed in drug-resistant epilepsy. In normal brain tissue MDR1/PgP is expressed almost exclusively by endothelial cells (EC), while in epileptic cortex both EC and perivascular astrocytes express MDR1/PgP. The underlying causes for tissue differences may be genomic (i.e., at the DNA level), or MDR1/PgP could be induced by seizures, previous drug treatment, or a combination of the above. We will present evidence showing that expression of multiple drug resistance genes in epilepsy is a complex phenomenon and that glial cells are involved. This second line of defense for xenobiotics may have profound implications for the pharmacokinetic properties of antiepileptic drugs and their capacity to reach neuronal targets.

journal_name

Curr Drug Targets

journal_title

Current drug targets

authors

Marroni M,Marchi N,Cucullo L,Abbott NJ,Signorelli K,Janigro D

doi

10.2174/1389450033491109

keywords:

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

297-304

issue

4

eissn

1389-4501

issn

1873-5592

journal_volume

4

pub_type

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