CCL3/Macrophage Inflammatory Protein-1α Is Dually Involved in Parasite Persistence and Induction of a TNF- and IFNγ-Enriched Inflammatory Milieu in Trypanosoma cruzi-Induced Chronic Cardiomyopathy.
CCL3, member of the CC-chemokine family, has been linked to heart tissue macrophage recruitment and parasite control in mouse acute infection with Trypanosoma cruzi, the causative agent of Chagas disease. Here, we approached CCL3 participation in chronic chagasic cardiomyopathy (CCC), the main clinical forms of Chagas disease. We CCC Rat Recombinant Proteins induced in C57BL / 6 (ccl3 + / +) and CCL3-deficiency (ccl3 - / -) mice by infection with Colombia Type I strain.
In ccl3 + / + mice, high levels CCL3 mRNA and protein were detected in heart tissue during acute and chronic infections. Survival is not affected by the shortage CCL3. Compared with ccl3 + / +, ccl3 chronically infected - / - mice presented decreased cardiac parasitism and inflammation caused by CD8 + cells and macrophages.
Leukocytosis decreased in infected ccl3 - / - mice, in line with the accumulation of CD8 + T cells with no CCR5 + activated LFA-1 + cells in the spleen. Furthermore, T. cruzi-infected ccl3 - / - mice served to reduce the frequency of interferon-gamma (IFN) + cells and the number of cell-specific IFN-producing parasite, while the cytotoxic activity of T. cruzi-specific antigen increases. CCL3-deficient macrophages stimulation with IFN improve control of parasites in the environment by reducing nitrous oxides (NOx) and tumor necrosis factor (TNF), but similar to interleukin-10 (IL-10), concentration.
Compared to chronic T. cruzi-infected ccl3 + / + counterparts, ccl3 - / - mice did not show an enlarged heart, the loss of left ventricular ejection fraction, QTc prolongation and increased activity of CK-MB. Compared with ccl3 + / +, ccl3 infected - / - mice showed a decrease in the concentration of TNF, while IL-10 levels were not affected, in the heart of the neighborhood. In spleen ccl3 + / + control NI, most of CD8 + T-cells expressing CCR1 or CCR5 receptor CCL3 that IL-10 +, whereas in infected mice these cells mainly TNF +. 
Lastly, blockage selective CCR1 / CCR5 (therapy Met-RANTES) in chronically infected ccl3 + / + mice reversed electrical abnormalities important http://gentaur-antibodies.com/ (bradycardia, prolonged PR and QTc interval), in correlation with reduced TNF and, especially, the level of CCL3 in liver tissue , Therefore, in T. cruzi infection chronic CCL3 take part in the parasite persistence and contribute to shaping the CD8 + T-cell and macrophageinflammatory enriched heart.
Furthermore, increased levels of CCL3 create scenarios with abundant IFN and TNF, is associated with cardiomyocyte injury, cardiac dysfunction and QTc prolongation, a biomarker of the severity of heart disease Chagas'.
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