Genistein induces growth arrest and suppresses telomerase activity in brain tumor cells

Aik Kia Khaw, Jacklyn Wei Yan Yong, Guruprasad Kalthur, M. Prakash Hande

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Genistein, a soy isoflavone, has been reported to exhibit multiple effects, such as inducing cell cycle arrest, triggering apoptosis, inhibiting the activation of NFKB and inactivating several signaling cascades in human cancer cells. In vivo studies demonstrating antiangiogenesis and antimetastatic effects of genistein have also been reported. Here, we demonstrate that genistein inhibits the growth of glioblastoma multiforme and medulloblastoma cells with different TP53 mutations and radio-responses by arresting the cells at G2/M phase of the cell cycle. The cell cycle arrest was found to be independent of DNA damage and such an arrest was sustainable for at least 10 days even after drug removal. Annexin V staining revealed absence of apoptotic or necrotic cell populations after genistein treatment. This supports the observation that genistein induces insignificant DNA damage and indicates that the cell cycle arrest triggered does not lead to cell death. Gene and protein expression studies reveal similar changes in the same pathways following treatment in the cell types tested. Genistein was also able to inhibit telomerase activity resulting in telomere shortening. Thus, we demonstrate, for the first time, that genistein induces growth arrest in association with telomerase inhibition in brain tumor cells via the suppression of TR- and TERT mRNA. By elucidating the mechanisms of anticancer effects after genistein treatment in brain tumor cells, there will be a premise for the incorporation of genistein dietary sources to complement radiotherapy in brain tumor patients.

Original languageEnglish
Pages (from-to)961-974
Number of pages14
JournalGenes Chromosomes and Cancer
Volume51
Issue number10
DOIs
Publication statusPublished - 10-2012

Fingerprint

Genistein
Telomerase
Brain Neoplasms
Growth
Cell Cycle Checkpoints
DNA Damage
Telomere Shortening
Medulloblastoma
Isoflavones
Angiogenesis Inhibitors
G2 Phase
Annexin A5
Glioblastoma
Radio
Cell Division
Cell Cycle
Cell Death
Radiotherapy
Therapeutics
Apoptosis

All Science Journal Classification (ASJC) codes

  • Genetics
  • Cancer Research

Cite this

Khaw, Aik Kia ; Yong, Jacklyn Wei Yan ; Kalthur, Guruprasad ; Hande, M. Prakash. / Genistein induces growth arrest and suppresses telomerase activity in brain tumor cells. In: Genes Chromosomes and Cancer. 2012 ; Vol. 51, No. 10. pp. 961-974.
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Genistein induces growth arrest and suppresses telomerase activity in brain tumor cells. / Khaw, Aik Kia; Yong, Jacklyn Wei Yan; Kalthur, Guruprasad; Hande, M. Prakash.

In: Genes Chromosomes and Cancer, Vol. 51, No. 10, 10.2012, p. 961-974.

Research output: Contribution to journalArticle

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