ASN Neuro. 2010 Dec 6. [Epub ahead of print]
T cell production of matrix metalloproteases and inhibition of parasite clearance by TIMP-1 during chronic Toxoplasma infection in the brain
Clark RT, Nance JP, Noor S, Wilson EH.
Chronic infection with the intracellular protozoan parasite Toxoplasma gondii leads to tissue remodeling in the brain and a continuous requirement for peripheral leukocyte migration within the CNS. In this study we investigated the role of matrix metalloproteases (MMPs) and their inhibitors for T cell migration into the infected brain. Increased expression of two key molecules, MMP-8 and MMP-10, along with their inhibitor, Tissue Inhibitor of Metalloproteinases-1 (TIMP-1) was observed in the CNS following infection. Analysis of infiltrating lymphocytes demonstrated MMP-8 and -10 production by CD4+ and CD8+ T cells. In addition, infiltrating T cells and CNS resident astrocytes increased their expression of TIMP-1 following infection. TIMP-1 deficient mice had a decrease in perivascular accumulation of lymphocyte populations yet an increase in the proportion of CD4+ T cells that had trafficked into the CNS. This was accompanied by a reduction in parasite burden in the brain. Together, these findings demonstrate a role for MMPs and TIMP-1 in the trafficking of lymphocytes into the CNS during chronic infection in the brain.
PMID: 21133852 [PubMed - as supplied by publisher]Free Article