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Gamma-tocotrienol modulation of senescence-associated gene expression prevents cellular aging in human diploid

Suzana Makpol1, Azalina Zainuddin, Kien Hui Chua

  • 1Universiti Kebangsaan Malaysia, Faculty of Medicine, Department of Biochemistry, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia. suzanamakpol@yahoo.com

Clinics (Sao Paulo, Brazil)
|February 24, 2012
PubMed
Abstract

Insights

Gamma-tocotrienol, a vitamin E compound, effectively prevents cellular aging in human fibroblasts. It modulates cell cycle progression and alters the expression of key senescence-associated genes, offering a potential therapeutic strategy for age-related conditions.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gerontology

Background:

  • Cellular aging, characterized by irreversible growth arrest in human diploid fibroblasts, is a fundamental process in aging.
  • Vitamin E and its homologs are known for their beneficial effects in aging, but their precise molecular mechanisms require further elucidation.
  • Understanding the molecular pathways of cellular aging is crucial for developing interventions against age-related decline.

Purpose of the Study:

  • To investigate the molecular mechanism by which gamma-tocotrienol (a vitamin E homolog) prevents cellular aging in human diploid fibroblasts.
  • To analyze the impact of gamma-tocotrienol on the expression of senescence-associated genes and cell cycle profiles.
  • To determine if gamma-tocotrienol can reverse or inhibit key markers of cellular senescence.

Main Methods:

  • Primary cultures of human diploid fibroblasts at different stages (young, pre-senescent, senescent) were treated with gamma-tocotrienol.
  • Quantitative real-time polymerase chain reaction (qRT-PCR) was employed to measure the expression levels of specific genes (ELN, COL1A1, MMP1, CCND1, RB1, IL6).
  • Flow cytometry was used to analyze cell cycle distribution (G(0)/G(1), S, G(2)/M phases).

Main Results:

  • Senescent fibroblasts exhibited cell cycle arrest in the G(0)/G(1) phase, with decreased S phase population and upregulation of CCND1, RB1, MMP1, and IL6.
  • Gamma-tocotrienol treatment in senescent cells reduced CCND1 and RB1 expression, shifted cell populations from G(0)/G(1) to G(2)/M phases.
  • Gamma-tocotrienol upregulated ELN and COL1A1 while downregulating MMP1 and IL6 in both young and senescent fibroblasts.

Conclusions:

  • Gamma-tocotrienol demonstrates a preventative effect against cellular aging in human diploid fibroblasts.
  • This prevention is associated with significant modulation of cell cycle progression and the expression of senescence-related genes.
  • The findings suggest gamma-tocotrienol as a potential agent for mitigating cellular aging processes.

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