HIV-1 Buds Predominantly at the Plasma Membrane of Primary Human Macrophages

PLoS Pathogens

Hans-Georg Kräusslich¹  Sonja Welsch¹  Anja Habermann¹  Oliver T Keppler¹  Ina Allespach¹  Jacomine Krijnse-Locker² 

[1] Department of Virology, University of Heidelberg, Heidelberg, Germany;European Molecular Biology Laboratory, Cell Biology and Biophysics Program, Heidelberg, Germany

关键词: Cell membranes;    HIV-1;    Viral structure;    Endosomes;    Macrophages;    Membrane proteins;    Intracellular membranes;    Membrane staining;   

DOI  :  10.1371/journal.ppat.0030036

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

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.

【 授权许可】

CC BY