RESUMO
OBJECTIVE: To observe the anti-tumor effect of moxibustion with seed-sized moxa cones on Hepa1-6 liver cancer bearing (HLCB) mice and its regulatory mechanism on cell apoptosis. METHODS: A total of 40 male C57BL/6 mice were randomly divided into control, moxibustion, cyclophosphamide (CTX) and moxibustion+CTX groups, with 10 mice in each group. The HLCB model was established by subcutaneous inoculation of Hepa1-6 cancer cells into the right armpit. Mice of the CTX and moxibustion+CTX groups were given intraperitoneal injection of CTX (30 mg/kg), once daily for 3 days. Moxibustion with seed-sized moxa cones were applied to "Dazhui" (GV14), bilateral"Zusanli" (ST36) and "Sanyinjiao" (SP6), with 5 moxa cones for each acupoint, once daily for 10 consecutive days. The survival status scores and body weight of HLCB mice were observed, and the tumor weight and tumor inhibition rate were detected. HE staining was used to observe the morphological changes of tumor tissue. ELISA was used to detect the levels of serum interleukin (IL)-2, IL-4 and tumor necrosis factor-α (TNF-α). Western blot and fluorescent quantitative real-time PCR were used to detect the protein and mRNA expressions of cysteine aspartate protease (Caspase) -3 and Caspase-9 in tumor tissues, separately. RESULTS: Compared with the control group, the survival status scores, body weight, serum IL-2 and TNF-α levels were significantly increased (P<0.05, P<0.01), the tumor weight and serum IL-4 levels were significantly decreased (P<0.05) in the moxibustion groupï¼while the survival status, body weight, tumor weight, serum IL-2 and IL-4 levels were significantly decreased (P<0.01, P<0.05), the content of TNF-α was significantly increased (P<0.01) in the CTX group. The protein and mRNA expressions of Caspase-3 and Caspase-9 in the 3 trentment groups were significantly increased (P<0.05, P<0.01). In comparison with the moxibustion group, the survival status scores, body weight and tumor weight, serum content of IL-2 were significantly decreased (P<0.01, P<0.05). In contrast to the CTX group, the survival status scores, body weight, serum IL-2 and TNF-α content, and the expressions of Caspase-3 and Caspase-9 in tumor tissue were significantly increased (P<0.01, P<0.05), and the tumor weight and serum IL-4 content were significantly decreased (P<0.05) in the moxibustion+CTX group. Results of HE staining showed that the tumor cells in the control group had clear nuclear membranes and nucleoli, with more dividing cellsï¼ while less nuclear division and an increase in tumor necrosis areas were found in the 3 treatment groups. CONCLUSION: Moxibustion with seed-size moxa cone can enhance the anti-tumor effect of CTX and improve the quality of life of HLCB mice, which may be related with its effect in activating the expressions of Caspase-3 and Caspase-9 in tumor tissue.