LLLT enhance cyclophosphamide induced TRPM2 channel activation in human colon cancer cells

Transient receptor potential (TRP) channels expression is enhanced significantly in colon cancer cells and  Low Lever Laser Treatment (LLLT), is known to have effects and is used clinically in the treatment ofmany diseases, including colon cancer. We aimed to reveal the effects of (LLLT) on apoptosis of colon cancer and on the efficacy of cyclophosphamide via Transient receptor potential melastatin 2 (TRPM2) channels.

Human colon cancer cells (Caco-2) were cultured and cells were divided into seven main groups. Cells were incubated with cyclophosphamide, TRPM2 channel inhibitor, stimulator and low level laser exposure separately and together. The effects of cyclophosphamide and low level laser were investigated on apoptosis.

It was found that the levels of apoptosis in cyclophosphamide group were significantly increased in cancer cells compared to the control group. TRPM2 channel stimulator administration resulted in significantly increased apoptosis levels compared to the control group, in cyclophosphamide + low level laser group the apoptosis level was significantly increased compared to the cyclophosphamide-only group.

It has been shown that apoptotic effects of cyclophosphamide on colon cancer cells were directly related to TRPM2 channels, low level laser increased apoptosis in colon cancer cells through TRPM2 channels and induced apoptotic effect of cyclophosphamide (Fig. 5, Ref. 26).