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Innate Immunity MOA for Anti-CD47 Antibodies 

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IgG Antibody

medical illustration of Proposed innate immunity mechanism of action for anti-CD47 antibodies.  Blocking the 
CD47/SIRP-a “don’t eat me” signal between tumor cells and antigen-presenting phagocytic cells (APCs) results in phagocytosis of the tumor cell and cross-presentation of antigens derived from the tumor cell via MHC class I to  T cells, which then are induced to produce apoptotic factors that can kill tumor cells directly.
Next medical illustration of SIRP-a, which is on the surface of phagocytes, normally binds CD47 on the surface of normal and tumor cells as a signal to prevent phagocytosis (often referred to as the “don’t eat me” signal).  Blocking the CD47/SIRP-a interaction with a monoclonal antibody can result in a pro-phagocytic response (i.e., the cancer cells can become phagocytized).

Blocking CD47/SIRP-a Interaction

Proposed innate immunity mechanism of action for anti-CD47 antibodies. Blocking the CD47/SIRP-a “don’t eat me” signal between tumor cells and antigen-presenting phagocytic cells (APCs) results in phagocytosis of the tumor cell and cross-presentation of antigens derived from the tumor cell via MHC class I to T cells, which then are induced to produce apoptotic factors that can kill tumor cells directly.

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