Abstract
Myeloid Derived Suppressor Cells (MDSCs) are a mixed group of bone marrow-derived myeloid cells containing macrophages, granulocytes, immature DCs and early myeloid precursors that have immune suppressive activity. MDSCs infiltrate the BM, spleen and peripheral blood of tumors-bearing experimental animals and are found in the blood of cancer patients as a result of tumor-induced alterations in myelopoiesis. Evidence from murine model systems indicated that myeloid-derived cells with suppressor activity also accumulate in non-tumor bearing hosts in response to infection, chemotherapy, stress, and immune senescence. MDSCs are considered key negative regulators of immune responses. Their association with tumor-associated immune defects make MDSCs an attractive target for therapeutic intervention in cancer.
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