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. 2022 Jun 1;12:9099. doi: 10.1038/s41598-022-13052-0

Figure 7.

Figure 7

Platelet activation signaling pathway. (1) Platelets can be activated via two ways: (A) The GPVI receptor on platelets’ surface binds to collagen fibers in the ECM of tumor tissue; (B) Platelets can also be activated through binding to thrombin, which is produced by cancer cells via PAR-1 receptors on the platelets’ surface. Activated platelets can promote tumor metastasis via different ways. (2) They can also release different cytokines that impair NK cell’s function. These cytokines also can help tumor cell growth and vascularization. (3) They can cover up metastatic cells in collaboration with fibrinogen fibers helping metastatic cells to escape from the immune system. *NK: natural killer; GPVI: glycoprotein VI.