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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Eur+J+Immunol 2011 ; 41 (3): 749-59 Nephropedia Template TP
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In vivo suppressive function of myeloid-derived suppressor cells is limited to the inflammatory site #MMPMID21287554
Eur J Immunol 2011[Mar]; 41 (3): 749-59 PMID21287554show ga
Current thinking suggests that despite the heterogeneity of myeloid-derived suppressor cells (MDSC), all Gr-1+CD11b+ cells can become suppressive when exposed to inflammatory stimuli. In vitro evaluation shows MDSC from multiple tissue sites have suppressive activity, and in vivo inhibition of MDSC function enhances T cell responses. However, the relative capacity of MDSC present at localized inflammatory sites or in peripheral tissues to suppress T cell responses in vivo has not been directly evaluated. We now demonstrate that during a tissue specific inflammatory response, MDSC inhibition of CD8 T cell proliferation and IFN-? production is restricted to the inflammatory site. Using a prostate specific inflammatory model and a heterotopic prostate tumor model, we show that MDSC from inflammatory sites or from tumor tissue possess immediate capacity to inhibit T cell function, whereas those isolated from peripheral tissues (spleens and liver) are not suppressive without activation of iNOS by exposure to IFN-?. These data show MDSC are important regulators of immune responses in the prostate during acute inflammation and the chronic inflammatory setting of tumor growth and that regulation of T cell function by MDSC during a localized inflammatory response is restricted in vivo to the site of an ongoing immune response.