Effects on P-Glycoprotein Expression After Blood-Brain Barrier Disruption Using Focused Ultrasound and Microbubbles

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2017 Jan 4

PMID 28045902

Citations 66

Authors

Muna Aryal

Krisztina Fischer

Caroline Gentile

Salvatore Gitto

Yong-Zhi Zhang

Nathan McDannold

Affiliations

Soon will be listed here.

Abstract

Many blood-borne substances attempting to pass through the luminal membrane of brain endothelial cells are acted upon by a variety of metabolizing enzymes or are actively expelled back into the capillary lumen by embedded efflux transporters, such as Permeability-glycoprotein (Pgp). Overexpression of this protein has also been linked to multidrug resistance in cancer cells. Previous studies have shown that focused ultrasound (FUS), when combined with a microbubble agent, has ability to temporarily disrupt blood-brain barrier (BBBD). In this work, we investigated whether modulation of Pgp expression is part of the FUS-induced effects. We found that ultrasound can temporarily suppress Pgp expression. When BBBD was produced at 0.55 MPa, Pgp was suppressed up to 48 hours and restored by 72 hours. At 0.81 MPa, suppression can last 72 hours or longer. These findings support the idea that microbubble-enhanced FUS disrupts the functional components of the BBB through suppression of drug efflux.

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