Expression of refractory epilepsy related drug resistance proteins in brain tissue of focal cortical dysplasia

Objective To study the locations of P-glycoprotein(P-gp),multi-drug resistanceassociated protein (MRP) and lung resistance.related protein(LRP)in brain tissue of focal cortical dysplasia (FCD) and to compare the quantity of these proteins in different brain tissues in an effort to study the mechanism of refractory epilepsy and to provide theoretical basis for medical treatment in patients with epilepsy.Methods The brain tissues of 16 cases with refractory epilepsy were collected during surgery,including 8 cases of focal cortical dysplasia type Ⅰ(FCD Ⅰ)and 8 cases of focal cortical dysplasia type Ⅱ (FCD Ⅱ) Five cases of glioma without history of epilepsy were included as the control group.Envision method was used to observe the location and intensity of expression of these three proteins.Western-Blot was used to analyze these proteins quantitatively.Results In brain tissue,the locations of P-glycoprotein,multi-drug resistance-associated protein and lung resistance-related protein were difierent.P-gp located mainly in capillary endothelial cells;MRP in neurons components;the location of LRP included capillary endothelial cells,balloon cells and the matrix of lesions.The expressions of three proteins in brain tissue of FCD were significantly higher than in control group(P-gp:0.520 ±0.121,MRP:0.132±0.018,LRP:0.092.±0.018,U=0.000,P<0.01).The expressions of P-gp and LRP in lesions of FCD Ⅱ(3.809 ±0.842 and 0.655±0.303,respectively)were higher than that in surrounding regions(2.636 ±0.622 and 0.290±0.096,U value were 6.000 and 4.500,both P<0.01).Conclusions P-gp,MRP and LRP expressed at different position of focal cortical dysplasia,suggesting that their roles were distinctive. Key words: Epilepsy;  Malformations of cortical development; P-glycoprotein;  Multidrug resistance-associated proteins;  Vault ribonucleoprotein,particles