Carcinogenesis, Teratogenesis & Mutagenesis ›› 2020, Vol. 32 ›› Issue (4): 286-291.doi: 10.3969/j.issn.1004-616x.2020.04.007

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Effect of ketogenic diet on growth of subcutaneously transplanted human lung cancer in nude mice

ZHANG Fan1, LIU Guangchao2, ZHANG Zhihan1, LIU Fangfang1, XIE Qi1, GAO Shuqing1   

  1. 1. Department of Nutrition, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011;
    2. Department of General Surgery, No. 980 Hospital of Joint Logistic Support Force of People's Liberation Army of China, Shijiazhuang 050011, Hebei, China
  • Received:2020-04-17 Revised:2020-06-17 Online:2020-07-31 Published:2020-08-01

Abstract: OBJECTIVE: To establish a subcutaneously transplanted tumor model of human lung cancer in nude mice and to evaluate effect of ketogenic diet on growth of the subcutaneously transplanted tumor. METHODS: Human lung cancer A549 cells were subcutaneously injected into the right lower limb of 10 female BALB/c nude mice. After establishing the transplanted tumor model, the nude mice were randomly divided into a standard diet group (standard diet,SD group) and a ketogenic diet group (ketogenic diet,KD group). Body mass,tumor volume,blood glucose and blood ketone concentration of nude mice were measured on the same day,and then every 5 days. On the 30th day after inoculation,the nude mice were killed,and blood lipids were determined from blood samples taken from their eyes. The transplanted tumor tissue was stripped, and the protein expression level of 4-HNE in the transplanted tumor tissue of nude mice was detected by Western blot and immunohistochemistry. RESULTS: From the 15th day after inoculation, the blood ketone concentration in the KD group was higher than that in the SD group, and the blood glucose concentration in the SD group was lower (P < 0.05). From the 20th day after inoculation,the body weight and tumor volume of the KD nude mice were significantly smaller than those in the SD group (P < 0.05). On the 30th day after inoculation, the concentration of total cholesterol (CHOL), high-density lipoprotein cholesterol (HDL-C),and low-density lipoprotein cholesterol (LDL-C) in the KD nude mice were higher than those in SD group,and the concentration of triglyceride (TG) were lower than SD. The difference between the two groups was statistically significant (P < 0.05). Western blot results showed that the relative expression level of 4-HNE in the KD group (1.45±0.10) was significantly higher than that in the SD group (1.00±0.03) (P < 0.05). Immunohistochemical results showed that the expression level of 4-HNE in the KD group (4.40±0.89) was significantly higher than that in the SD group (2.40±0.89) (P < 0.05). CONCLUSION: KD diet inhibited the growth of subcutaneously transplanted human lung cancer in nude mice,and its mechanism may be related to the enhancement of oxidative stress of tumor cells.

Key words: ketogenic diet, lung cancer, nude mice, 4-hydroxynonenal

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