Aim: Cannabinoids (CB) like Δ 16 9 -tetrahydrocannabinol (THC) can induce cancer cell apoptosis and inhibit angiogenesis. However, the use of cannabinoids for the treatment of malignant diseases is discussed 17 controversially because of their immunomodulatory effects which can suppress anti-tumor immunity. Here 18 we investigated the role of exogenous and endogenous cannabinoids in mouse skin cancer. 19 Main methods: First we examined the effect of THC, which binds to CB receptors (CB1, CB2), on the growth of the 20 mouse melanoma cell lines B16 and HCmel12 in vitro and in vivo in wild type (WT) and CB1/CB2-receptor 21 deficient mice (Cnr1/2 22 −/−)....
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