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Gastric cancer is one of the most common cancers worldwide. This study investigated the chemosensitivity-enhancing effects of Erteng-Sanjie capsule (ETSJC) in combination with 5-fluorouracil (5-FU) on gastric cancer and its possible underlying mechanisms. The study established a subcutaneous xenograft model of human gastric cancer. The animals were divided into five groups: the control group, the 5-FU group, the 5-FU + ETSJC low-dose group, the 5-FU + ETSJC medium-dose group, and the 5-FU + ETSJC high-dose group. The tumor volume and tumor weight were calculated. TUNEL staining was used to evaluate cell apoptosis. Immunohistochemical analysis was used to detect the expression of Ki67 +  cells and the CD31 +  microvessel density in tumors. Simultaneously, western blot analysis was applied to detect the expression of caspase-3, Bax, Bcl-2, Notch1, and Hes1 proteins. Compared with the control group, tumor volume and weight in the 5-FU and 5-FU + ETSJC groups were inhibited. Moreover, compared with the 5-FU group, tumor volume and weight were significantly inhibited in the 5-FU + ETSJC groups. The numbers of Ki67 +  cells, CD31 +  microvessel density, and the expression of Bcl-2, Notch1, and Hes1 proteins were markedly decreased in the combination group when compared with the chemotherapy alone group. The numbers of TUNEL +  cells and the expression of Bax and caspase-3 proteins were significantly increased in the 5-FU + ETSJC groups when compared with the 5-FU group. The therapeutic effects were demonstrated to be dose dependent. In conclusion, the findings of the study showed that ETSJC improved the chemosensitivity of 5-FU by blocking Notch1/Hes1 signaling pathway in gastric cancer-bearing mice.

evidence-based complementary and alternative medicine

Erteng-Sanjie Capsule Enhances Chemosensitivity of 5-Fluorouracil in Tumor-Bearing Nude Mice with Gastric Cancer by Inhibiting Notch1/Hes1 Signaling Pathway