HIV-1 buds predominantly at the plasma membrane of primary human macrophages.

Abstract:

:HIV-1 assembly and release are believed to occur at the plasma membrane in most host cells with the exception of primary macrophages, for which exclusive budding at late endosomes has been reported. Here, we applied a novel ultrastructural approach to assess HIV-1 budding in primary macrophages in an immunomarker-independent manner. Infected macrophages were fed with BSA-gold and stained with the membrane-impermeant dye ruthenium red to identify endosomes and the plasma membrane, respectively. Virus-filled vacuolar structures with a seemingly intracellular localization displayed intense staining with ruthenium red, but lacked endocytosed BSA-gold, defining them as plasma membrane. Moreover, HIV budding profiles were virtually excluded from gold-filled endosomes while frequently being detected on ruthenium red-positive membranes. The composition of cellular marker proteins incorporated into HIV-1 supported a plasma membrane-derived origin of the viral envelope. Thus, contrary to current opinion, the plasma membrane is the primary site of HIV-1 budding also in infected macrophages.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Welsch S,Keppler OT,Habermann A,Allespach I,Krijnse-Locker J,Kräusslich HG

doi

10.1371/journal.ppat.0030036

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

e36

issue

3

eissn

1553-7366

issn

1553-7374

pii

06-PLPA-RA-0439R2

journal_volume

3

pub_type

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