RON receptor tyrosine kinase, a negative regulator of inflammation, inhibits HIV-1 transcription in monocytes/macrophages and is decreased in brain tissue from patients with AIDS.
Activation of macrophages and microglia cells after HIV-1 infection and their production of inflammatory mediators contribute to HIV-associated CNS diseases. The mechanisms that initiate and maintain inflammation after HIV-1 infection in the brain have not been well studied. Furthermore, it is not understood why in HIV-associated CNS disease, macrophages and microglia are biased toward inflammation rather than production of mediators that control inflammation. We have focused on the receptor tyrosine kinase RON, a critical negative regulator of macrophage function and inflammation, to determine whether this receptor regulates HIV-1 expression. Overexpressing RON in monocytes/macrophages demonstrates that RON inhibits HIV-1 proviral transcription in part by decreasing the binding activity of NF-kappaB to the HIV-1 long terminal repeat. Because macrophages and microglia cells are a critical reservoir for HIV-1 in the CNS, we examined brain tissues for RON expression and detected RON in astrocytes, cortical neurons, and monocytoid cells. RON was detected in all control patients who were HIV seronegative (n = 7), whereas six of nine brain samples obtained from AIDS patients exhibited reduced RON protein. These data suggest that RON initiates signaling pathways that negatively regulate HIV-1 transcription in monocytes/macrophages and that HIV-1 suppresses RON function by decreasing protein levels in the brain to assure efficient replication. Furthermore, HIV-1 infection would compromise the ability of RON to protect against inflammation and consequent CNS damage.
Lee
Eileen S
ES
Graduate Program in Biochemistry, Department of Veterinary Science, Pennsylvania State University, University Park, PA 16802, USA.
Kalantari
Parisa
P
Tsutsui Section
Shigeki
S
Klatt
Alicia
A
Holden
Janet
J
Correll
Pamela H
PH
Power Section
Christopher
C
Henderson
Andrew J
AJ
D015526:AIDS Dementia Complex / Q000201:enzymology* / Q000276:immunology / Q000473:pathology; D000328:Adult; D019380:Anti-HIV Agents / Q000494:pharmacology*; D001921:Brain / Q000201:enzymology / Q000473:pathology* / Q000821:virology; D002460:Cell Line; D002908:Chronic Disease; D015536:Down-Regulation / Q000235:genetics / Q000276:immunology; D004794:Enzyme Repression / Q000276:immunology; D015497:HIV-1 / Q000235:genetics* / Q000276:immunology; D006801:Humans; D018836:Inflammation Mediators / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000502:physiology*; D008264:Macrophages / Q000201:enzymology* / Q000276:immunology / Q000821:virology; D008875:Middle Aged; D009000:Monocytes / Q000201:enzymology* / Q000276:immunology / Q000821:virology; D016328:NF-kappa B / Q000037:antagonists & inhibitors / Q000378:metabolism; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000502:physiology*; D012097:Repressor Proteins / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000502:physiology; D014158:Transcription, Genetic / Q000276:immunology; D020298:U937 Cells
D019380:Anti-HIV Agents; D018836:Inflammation Mediators; D016328:NF-kappa B; D012097:Repressor Proteins; C080835:RON protein; D020794:Receptor Protein-Tyrosine Kinases