Abstract:
:CCR2, and its principle ligand MCP-1/CCL2, have been well documented for their ability to induce monocyte infiltration and promote the pathogenesis of rheumatoid arthritis and atherosclerosis. In order to assess additional roles for CCR2, we inserted allogeneic implants into CCR2-/- and MCP-1-/- mice and characterized T cell responses and the regulatory role of CCR2 on MCP-1 expression. The results demonstrate a marked decrease in lymphocyte infiltration in both CCR2-/- and MCP-1-/- animals. In contrast, IL-12 and CTL function were only suppressed in CCR2-/- animals. Further, whereas MCP-1 was only transiently elevated in the inflammatory fluid of WT animals, levels were sustained within the implants (5000pg/ml; >8 days) and serum (243pg/ml) of CCR2-/- mice. Higher levels of MCP-1 were also observed in the culture supernatants of CCR2-/- macrophages as compared to WT cells despite no difference in mRNA levels. Evidence that MCP-1 levels are regulated by receptor binding and internalization was suggested by its rapid decline when added to WT macrophages at 37 degrees C but not 4 degrees C. These studies indicate that CCR2 plays an important role in regulating T cell responses and controlling the level of MCP-1 at inflammatory sites.
journal_name
Cytokinejournal_title
Cytokineauthors
Tylaska LA,Boring L,Weng W,Aiello R,Charo IF,Rollins BJ,Gladue RPdoi
10.1006/cyto.2002.1031keywords:
subject
Has Abstractpub_date
2002-05-21 00:00:00pages
184-90issue
4eissn
1043-4666issn
1096-0023pii
S1043466602910318journal_volume
18pub_type
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