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Published on: January 12, 2020

Notch-1 inhibition by Withaferin-A: a therapeutic target against colon carcinogenesis

Srinivas Koduru1, Raj Kumar, Sowmyalakshmi Srinivasan

  • 1Department of Clinical Sciences, College of Health Sciences, University of Kentucky, Lexington, Kentucky 40536-0200, USA.

Molecular Cancer Therapeutics
|January 8, 2010
PubMed

Insights

Withaferin-A, a natural compound, inhibits Notch signaling and prosurvival pathways in colon cancer cells. This compound shows potential for developing targeted chemotherapy and chemoprevention strategies for colon cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Natural Products Chemistry

Background:

  • Notch signaling is integral to colon cancer development.
  • Targeting the Notch pathway may enhance colon cancer sensitivity to adjuvant therapies.
  • Identifying natural compounds for colon cancer prevention and treatment is a key research area.

Purpose of the Study:

  • To investigate natural compounds targeting Notch signaling for colon cancer prevention and treatment.
  • To evaluate the efficacy of Withaferin-A (WA) in colon cancer cell lines.
  • To elucidate the molecular mechanisms of WA's action on Notch and related signaling pathways.

Main Methods:

  • Treatment of colon cancer cell lines (HCT-116, SW-480, SW-620) with Withaferin-A.
  • Analysis of Notch-1 signaling, prosurvival pathways (Akt/NF-kappaB/Bcl-2), and mammalian target of rapamycin (mTOR) signaling components (pS6K, p4E-BP1).
  • Investigation of apoptosis induction via c-Jun-NH(2)-kinase (JNK) pathway.
  • Molecular link establishment using Notch-1 overexpression and small interfering RNA (siRNA) inhibition.

Main Results:

  • Withaferin-A inhibited Notch-1 signaling and downregulated prosurvival pathways (Akt/NF-kappaB/Bcl-2) in colon cancer cells.
  • WA reduced the expression of mTOR signaling components (pS6K, p4E-BP1).
  • Withaferin-A activated c-Jun-NH(2)-kinase-mediated apoptosis and established a molecular link between Notch, Akt, and mTOR signaling.

Conclusions:

  • Withaferin-A demonstrates significant anticancer activity by inhibiting Notch-mediated prosurvival signaling in colon cancer.
  • WA facilitates c-Jun-NH(2)-kinase-mediated apoptosis in colon cancer cell lines.
  • Withaferin-A holds potential for targeted chemotherapy and chemoprevention strategies in colon cancer treatment.

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