The Src kinase Lyn is required for CCR5 signaling in response to MIP-1beta and R5 HIV-1 gp120 in human macrophages.

Abstract:

:CCR5 is a receptor for several beta chemokines and the entry coreceptor used by macrophage-tropic (R5) strains of HIV-1. In addition to supporting viral entry, CCR5 ligation by the HIV-1 envelope glycoprotein 120 (gp120) can activate intracellular signals in macrophages and trigger inflammatory mediator release. Using a combination of in vitro kinase assay, Western blotting for phospho-specific proteins, pharmacologic inhibition, CCR5 knockout (CCR5Delta32) cells, and kinase-specific blocking peptide, we show for the first time that signaling through CCR5 in primary human macrophages is linked to the Src kinase Lyn. Stimulation of human monocyte-derived macrophages with either HIV-1 gp120 or MIP-1beta results in the CCR5-mediated activation of Lyn and the concomitant Lyn-dependent activation of the mitogen-activated protein (MAP) kinase ERK-1/2. Furthermore, activation of the CCR5/Lyn/ERK-1/2 pathway is responsible for gp120-triggered production of TNF-alpha by macrophages, which is believed to contribute to HIV-1 pathogenesis. Thus, Lyn kinase may play an important role both in normal CCR5 function in macrophages and in AIDS pathogenesis in syndromes such as AIDS dementia where HIV-1 gp120 contributes to inappropriate macrophage activation, mediator production, and secondary injury.

journal_name

Blood

journal_title

Blood

authors

Tomkowicz B,Lee C,Ravyn V,Cheung R,Ptasznik A,Collman RG

doi

10.1182/blood-2005-12-012815

subject

Has Abstract

pub_date

2006-08-15 00:00:00

pages

1145-50

issue

4

eissn

0006-4971

issn

1528-0020

pii

blood-2005-12-012815

journal_volume

108

pub_type

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