RE: Presentation16 Nov 2021 15:57
Ok, studied the CD47 and it is not a protein on a macrophage (like clever-1 on a macrophage) but on the surface of a cancer cell as well on a normal cell.
So the mechanism of action of CD47 blocking antibodies goes like this. Under normal conditions, normal and cancer cells evade macrophage phagocytosis by expressing CD47. In cancer cells CD47 is overexpressed to protect against the expression of eat me/pro-phagocytic signals. With CD47 blockade (with an anti-CD47 antibody), cancer cells are phagocytosed due to CD47 blockade and resulting unmasking of the “eat me” signal. In contrast, normal cells are spared given the lack of expression of pro-phagocytic signals.
So my question is now to understand the logic here with clever-1. Has the macrophage already eaten the cancer cell so tidy that no residue left to signal further T-cell activation (hiding the problem). Thus blocking clever-1 on the macrophage by Bex the macrophages leave some residue (revealing the problem) and signals T-cells to get further activated?
Still don’t know how potential the “eat me” compared to “hide me”.