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Development and Maintenance of a Preclinical Patient Derived Tumor Xenograft Model for the Investigation of Novel Anti-Cancer Therapies
Published on: September 30, 2016
DADS suppresses human esophageal xenograft tumors through RAF/MEK/ERK and mitochondria-dependent pathways
Xiaoran Yin1, Jun Zhang2, Xiaoning Li3
1Department of Oncology, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China. yinxiaoran@163.com.
Abstract:
Diallyl disulfide (DADS) is a natural organosulfur compound isolated from garlic. DADS has various biological properties, including anticancer, antiangiogenic, and antioxidant effects. However, the anticancer mechanisms of DADS in human esophageal carcinoma have not been elucidated, especially in vivo. In this study, MTT assay showed that DADS significantly reduced cell viability in human esophageal carcinoma ECA109 cells, but was relatively less toxic in normal liver cells. The pro-apoptotic effect of DADS on ECA109 cells was detected by Annexin V-FITC/propidium iodide (PI) staining. Flow cytometry analysis showed that DADS promoted apoptosis in a dose-dependent manner and the apoptosis rate could be decreased by caspase-3 inhibitor Ac-DEVD-CHO. Xenograft study in nude mice showed that DADS treatment inhibited the growth of ECA109 tumor in both 20 and 40 mg/kg DADS groups without obvious side effects. DADS inhibited ECA109 tumor proliferation by down-regulating proliferation cell nuclear antigen (PCNA). DADS induced apoptosis by activating a mitochondria-dependent pathway with the executor of caspase-3, increasing p53 level and Bax/Bcl-2 ratio, and downregulating the RAF/MEK/ERK pathway in ECA109 xenograft tumosr. Based on studies in cell culture and animal models, the findings here indicate that DADS is an effective and safe anti-cancer agent for esophageal carcinoma.
Insights
Diallyl disulfide (DADS), a garlic compound, effectively inhibits esophageal cancer growth and promotes apoptosis in cells and animal models. DADS shows promise as a safe and potent anticancer agent for esophageal carcinoma.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Diallyl disulfide (DADS) is a natural organosulfur compound found in garlic with known anticancer properties.
- The specific anticancer mechanisms of DADS in human esophageal carcinoma, particularly in vivo, remain largely unelucidated.
- Esophageal carcinoma is a significant global health concern requiring novel therapeutic strategies.
Purpose of the Study:
- To investigate the anticancer mechanisms of DADS in human esophageal carcinoma cells (ECA109) and in vivo xenograft models.
- To evaluate the efficacy and safety of DADS as a potential therapeutic agent for esophageal carcinoma.
- To elucidate the molecular pathways involved in DADS-induced apoptosis and proliferation inhibition.
Main Methods:
- MTT assays were used to assess cell viability in ECA109 cells and normal liver cells.
- Annexin V-FITC/propidium iodide (PI) staining and flow cytometry were employed to detect apoptosis.
- Xenograft studies in nude mice were conducted to evaluate tumor growth inhibition and safety profiles.
Main Results:
- DADS significantly reduced ECA109 cell viability with minimal toxicity to normal liver cells.
- DADS induced apoptosis in a dose-dependent manner, confirmed by flow cytometry and caspase-3 inhibition.
- In vivo, DADS treatment inhibited ECA109 tumor growth, reduced proliferation (PCNA), and activated apoptosis via the mitochondria-dependent pathway, involving caspase-3, p53, Bax/Bcl-2 ratio, and the RAF/MEK/ERK pathway.
Conclusions:
- DADS demonstrates significant anticancer effects against human esophageal carcinoma in both in vitro and in vivo models.
- DADS induces apoptosis and inhibits proliferation through specific molecular pathways, including the mitochondria-dependent pathway and modulation of key proteins and signaling cascades.
- DADS presents as a safe and effective potential therapeutic agent for esophageal carcinoma, warranting further clinical investigation.
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