Twist2 and CD24 expression alters renal microenvironment in obesity associated kidney cancer

X.-F. Yang, G. Ma, N.-H. Feng, D.-S. Yu, Y. Wu, C. Li

Department of Urology, Wuxi Second Hospital, Nanjing Medical University, Wuxi, China. MAudreystras@yahoo.com

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• Oncology

OBJECTIVE: Obesity emerged as a major public health problem worldwide, and prolonged condition with increased BMI causes various metabolic disorders include the development of kidney cancer. The metabolic changes alter the renal microenvironment and thereby promoting tumor. Hence, detailed studies of genes that regulate these this changes are keen to understand.

MATERIALS AND METHODS: Initially, we successfully initiate kidney tumor using prolonged intake of a high-fat diet in Wistar rats, which are confirmed with pathological changes observed through histological sectioning. The expression of Twist2 and CD24 was assessed using Immunohistology and Western Blotting in a different time interval of kidney cancer.

RESULTS: The rats fed with high-fat diet for 8 months shows 1.5 times increased in body mass whereas rats fed with high-fat diet for 16 months shows triple the size when compared with controls. Histological sectioning confirms the development of lesions and proteinaceous casts in 8 months high-fat fed rats, whereas we observed the high proliferative mass of cells in 16 months high-fat fed rats. Interestingly, we also observed elevated expression of Twist2 in initial stages of kidney cancer, which are down-regulated in the latter stages of kidney cancer. The experiments with CD24 shows the gradual increase of the expression of CD24 as a tumor develops to the next level.

CONCLUSIONS: The correlation between Twist2 and CD24 expression conclude that Twist2 overexpression in initial stage augments CD24 to express more in the latter stage of kidney cancer. Reversely, the overexpression of CD24 and down-regulation of Twist2 in later stages of kidney cancer suggest the CD24 expression is dependent on Twist2 expression level.

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