@article { author = {Abdul-Auhaimen, Nidhal and Al-Kaabi, Zaman I. L.}, title = {Functional and Developmental Analysis of CD4+CD25+ Regulatory T Cells under the Influence of Streptococcal M Protein in Rheumatic Heart Disease}, journal = {Iranian Journal of Medical Sciences}, volume = {36}, number = {2}, pages = {122-127}, year = {2011}, publisher = {Shiraz University of Medical Sciences}, issn = {0253-0716}, eissn = {1735-3688}, doi = {}, abstract = {The purpose of this study was to determine the role of streptococcal M protein in naturally-occurring CD4+CD25+ regulatory T cells (nTregs) function and development in rheumatic heart disease in Iraqi patients. Streptococcus pyogenes was isolated for subsequent M protein extraction. Also, peripheral blood nTregs and CD4+ T cells were isolated by using Magnetic Cell Separation System. Tissue culture for isolated cells was performed in the presence and absence of M protein. Cell count was performed, and tumor necrosis factor alpha (TNF-α) and interleukin-4 (IL-4) were determined in culture supernatant using ELISA system. There was a significant positive correlation (P0.05), association (r=0.353) between the mean number of nTregs and CD4+ T cells in the presence of M protein. The M protein stimulated CD4+ T cells to produce IL-4 in very little amount (}, keywords = {Rheumatic heart disease,CD4+CD25+ regulatory T cells,M protein}, url = {https://ijms.sums.ac.ir/article_39614.html}, eprint = {https://ijms.sums.ac.ir/article_39614_750437b8098bc5168f82f3cefceb2b5a.pdf} }