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Antitumor effect of the angiogenesis inhibitor TNP-470 on human digestive organ malignancy
1Second Department of Surgery, Hamamatsu University School of Medicine, Japan.
Abstract:
The antitumor and antimetastatic effects of TNP-470, an angiogenesis inhibitor, on human gastrointestinal tumors xenotransplanted into nude mice were investigated. When two gastric cancer (MT-2 and MT-5) and two colon cancer (TK-4 and TK-13) xenografts are transplanted orthotopically into nude mice, liver metastasis develops 6 weeks after transplantation. TNP-470 30 mg/kg had a significant inhibitory effect on primary tumor growth of gastric cancers when given on alternate days from 7 days after transplantation. However, when given from 10 days or 14 days after transplantation, no inhibitory effect on the growth of any tumor xenograft was observed. In contrast, liver metastasis of each xenograft type was inhibited significantly by TNP-470. The effect of TNP-470 on prognosis was investigated using a hepatic metastatic model of rat hepatoma. Although all untreated rats that received AH-130 cell implants died within one month of massive hepatic metastasis, >50% of rats treated with TNP-470 survived for 4 months. The number of apoptotic cells in hepatic metastatic foci was significantly increased by TNP-470 administration. These results suggest that TNP-470 may provide a new approach to the treatment of digestive organ malignancies.
Insights
TNP-470, an angiogenesis inhibitor, effectively reduced liver metastasis in gastrointestinal cancer models. Early administration of TNP-470 also inhibited primary tumor growth, suggesting its potential in treating digestive organ malignancies.
Area of Science:
- Oncology
- Cancer Research
- Pharmacology
Background:
- Gastrointestinal tumors are a significant cause of cancer-related mortality.
- Angiogenesis plays a crucial role in tumor growth and metastasis.
- TNP-470 is a known angiogenesis inhibitor with potential antitumor properties.
Purpose of the Study:
- To investigate the antitumor and antimetastatic effects of TNP-470 on human gastrointestinal tumors xenotransplanted into nude mice.
- To evaluate the impact of TNP-470 administration timing on primary tumor growth and liver metastasis.
- To assess the effect of TNP-470 on survival and apoptosis in a rat hepatoma hepatic metastatic model.
Main Methods:
- Orthotopic transplantation of human gastric (MT-2, MT-5) and colon (TK-4, TK-13) cancer xenografts into nude mice.
- Administration of TNP-470 (30 mg/kg) at different time points post-transplantation.
- Evaluation of primary tumor growth and liver metastasis.
- Assessment of TNP-470's effect on survival and apoptosis in a rat hepatoma hepatic metastatic model (AH-130 cells).
Main Results:
- TNP-470 significantly inhibited liver metastasis of all tested xenografts.
- Early administration of TNP-470 (from 7 days post-transplantation) significantly inhibited primary gastric cancer growth.
- TNP-470 treatment led to increased survival rates (>50% at 4 months) in rats with hepatic metastasis and increased apoptosis in metastatic foci.
Conclusions:
- TNP-470 demonstrates significant antimetastatic efficacy against gastrointestinal tumors.
- The timing of TNP-470 administration is critical for inhibiting primary tumor growth.
- TNP-470 shows promise as a therapeutic agent for digestive organ malignancies, potentially through inducing apoptosis and inhibiting metastasis.
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