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Goniothalamin induces apoptosis in vascular smooth muscle cells

K M Chan1, N F Rajab, M H A Ishak

  • 1Department of Biomedical Science, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.

Chemico-Biological Interactions
|November 22, 2005
PubMed

Insights

Goniothalamin (GN) induces DNA damage and apoptosis in vascular smooth muscle cells (VSMCs), offering a potential therapeutic strategy for restenosis. Its cytotoxicity is more potent than rapamycin, suggesting promise in cardiovascular treatments.

Area of Science:

  • Cardiovascular Biology
  • Pharmacology
  • Cell Biology

Background:

  • Restenosis, a complication of coronary angioplasty, is driven by vascular smooth muscle cell (VSMC) proliferation.
  • Rapamycin and paclitaxel are established agents impacting VSMC proliferation in restenosis.
  • Understanding novel therapeutic mechanisms for restenosis is crucial.

Purpose of the Study:

  • To investigate the cytotoxic mechanisms of goniothalamin (GN) on VSMCs.
  • To compare the efficacy of GN with rapamycin in inhibiting VSMC proliferation and inducing cytotoxicity.
  • To elucidate the initial cellular events triggered by GN exposure.

Main Methods:

  • MTT cytotoxicity assay to determine IC(50) values.
  • Bromodeoxyuridine (BrdU) cell proliferation assay to assess proliferation inhibition.
  • Comet assay to detect DNA damage post-treatment.
  • Flow cytometry to quantify apoptotic cells.

Main Results:

  • Goniothalamin (GN) exhibited a lower IC(50) (4.4 microg/ml) than rapamycin (25 microg/ml) in VSMCs.
  • GN induced significant apoptosis in VSMCs (25.83% at 72h).
  • GN demonstrated comparable inhibition of VSMC proliferation to rapamycin.
  • A concentration-dependent increase in DNA damage was observed prior to GN-induced cytotoxicity.

Conclusions:

  • Goniothalamin (GN) induces DNA damage in VSMCs, leading to apoptosis and cytotoxicity.
  • GN shows potential as a therapeutic agent for restenosis, with higher potency than rapamycin.
  • The findings provide insights into the anti-restenosis mechanisms of GN.

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