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The objective of this study was to determine the expression of the important vesicle trafficking-regulating factor Rab25 in human gastric cancer tissues, to analyze the correlation between Rab25 protein expression with gastric cancer occurrence and development, and to discuss the correlation of Rab25 protein expression with gastric cancer cell metastasis. The overall aim was to provide experimental evidence that can be used to design future biological treatments of human gastric cancer. Human gastric cancer tissue and the adjacent normal gastric tissue were surgically removed, and immunohistochemistry and Western blotting were used to detect Rab25 protein expression. The correlation between Rab25 protein expression with the development and pathological characteristics of gastric cancer was analyzed. Using RNAi, Rab25 expression was reduced in the gastric cancer cell line MGC80-3, and the changes in MGC80-3 cell invasiveness were then monitored. Immunohistochemistry showed that the Rab25 protein expression rates were 78.21% and 23.08% in gastric carcinoma and the adjacent normal gastric tissue, respectively. Immunohistochemistry and Western blot results showed that Rab25 protein expression in gastric cancer was significantly higher than in adjacent normal gastric tissues (P&lt;0.01). Less differentiated gastric cancer cells had higher expression of Rab25 protein (P&lt;0.01). Gastric carcinomas from patients with a late pathological stage (III-IV) had significantly higher Rab25 protein expression than early stage (I-II) patients (P&lt;0.01). Gastric carcinomas from patients with lymph node metastasis had significantly higher Rab25 protein expression than lymph node metastasis-free patients (P&lt;0.01). Gastric carcinomas from patients with distant metastases had significantly higher Rab25 protein expression than the distant metastasis-negative patients (P&lt;0.01). Rab25 protein expression in gastric cancer was not affected by the patients(,) sex, age, or tumor size (P&gt;0.05). MGC80-3 cells transfected with Rab25 siRNA had significantly lower Rab25 protein expression (P&lt;0.01) and a significantly lower number of cells that passed through a Transwell chamber compared with non-transfected controls and the transfected control group (P&lt;0.01). Rab25 protein expression is associated with the development of gastric cancer. siRNA knockdown of Rab25 protein expression in MGC80-3 gastric cancer cells reduced MGC80-3 cell invasiveness and provided experimental evidence for potential future biological treatment strategies of human gastric cancer.

Expression of Rab25 correlates with the invasion and metastasis of gastric cancer.