HIV-1 gp120-induced migration of dendritic cells is regulated by a novel kinase cascade involving Pyk2, p38 MAP kinase, and LSP1.
Targeting dendritic cell (DC) functions such as migration is a pivotal mechanism used by HIV-1 to disseminate within the host. The HIV-1 envelope protein is the most important of the virally encoded proteins that exploits the migratory capacity of DCs. In the present study, we elucidated the signaling machinery involved in migration of immature DCs (iDCs) in response to HIV-1 envelope protein. We observed that M-tropic HIV-1 glycoprotein 120 (gp120) induces phosphorylation of the nonreceptor tyrosine kinase, Pyk2. Inhibition of Pyk2 activity using a pharmacologic inhibitor, kinase-inactive Pyk2 mutant, and Pyk2-specific small interfering RNA blocked gp120-induced chemotaxis, confirming the role of Pyk2 in iDC migration. In addition, we also illustrated the importance of Pyk2 in iDC migration induced by virion-associated envelope protein, using aldithriol-2-inactivated M-tropic HIV-1 virus. Further analysis of the downstream signaling mechanisms involved in gp120-induced migration revealed that Pyk2 activates p38 mitogen-activated protein kinase, which in turn activates the F-actin-binding protein, leukocyte-specific protein 1, and enhances its association with actin. Taken together, our studies provide an insight into a novel gp120-mediated pathway that regulates DC chemotaxis and contributes to the dissemination of HIV-1 within an infected person.
Anand
Appakkudal R
AR
Department of Pathology, Ohio State University, Columbus, OH 43210, USA.
Prasad
Anil
A
Bradley
Ritu R
RR
Deol
Yadwinder S
YS
Nagaraja
Tirumuru
T
Ren
Xianghui
X
Terwilliger
Ernest F
EF
Ganju
Ramesh K
RK
D015153:Blotting, Western; D002465:Cell Movement; D002633:Chemotaxis; D003713:Dendritic Cells / Q000378:metabolism*; D005434:Flow Cytometry; D051418:Focal Adhesion Kinase 2 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D015699:HIV Envelope Protein gp120 / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008840:Microfilament Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology; D019713:Receptors, CCR5 / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020032:Tyrphostins / Q000494:pharmacology; D048051:p38 Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism*
D015699:HIV Envelope Protein gp120; C489183:LSP1 protein, human; D008840:Microfilament Proteins; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019713:Receptors, CCR5; D020032:Tyrphostins; C406122:tyrphostin A9; D051418:Focal Adhesion Kinase 2; D048051:p38 Mitogen-Activated Protein Kinases
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