Developmental regulation of P-glycoprotein activity within thymocytes results in increased anti-HIV protease inhibitor activity.


Journal Article

The thymus harbors HIV-1 and supports its replication. Treatment with PI-containing ART restores thymic output of naïve T cells. This study demonstrates that CXCR4-using WT viruses are more sensitive to PI in fetal thymcocytes than mature T cells with average IC(50) values for two PIs, RTV and IDV, of 1.5 nM (RTV) and 4.4 nM (IDV) in thymocytes versus 309.4 nM (RTV) and 27.3 nM (IDV) in mature T cells. P-gp activity, as measured using Rh123 efflux and quantitation of P-gp mRNA, increased with thymocyte maturation into CD4 and CD8 lineage T cells. P-gp activity is developmentally regulated in the thymus. Thymocytes developed increased levels of P-gp activity as maturation from DP to SP CD4 or CD8 T cells occurred, although CD4 T cells acquired activity more rapidly. Reduced P-gp activity in thymocytes is one mechanism for effectiveness of PI therapy in suppressing viral replication in the thymus and in reconstitution of naïve T cells, particularly among children receiving PI-containing ART.

Full Text

Duke Authors

Cited Authors

  • Haraguchi, S; Ho, SK; Morrow, M; Goodenow, MM; Sleasman, JW

Published Date

  • October 2011

Published In

Volume / Issue

  • 90 / 4

Start / End Page

  • 653 - 660

PubMed ID

  • 21504949

Pubmed Central ID

  • 21504949

Electronic International Standard Serial Number (EISSN)

  • 1938-3673

Digital Object Identifier (DOI)

  • 10.1189/jlb.0111-009


  • eng

Conference Location

  • United States