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Protection from aging by small chaperones: A trade-off with cancer?

Geneviève Morrow1, Hyun-Ju Kim, Marie Le Pécheur

  • 1Laboratory of Cell and Developmental Genetics, Department of Molecular Biology, Medical Biochemistry and Pathology, Institut de Biologie Intégrative et des Systèmes and PROTEO Université Laval, Québec, Canada.

Annals of the New York Academy of Sciences
|June 12, 2010
PubMed

Insights

Overexpressing the small heat shock protein DmHsp22 in fruit flies extends lifespan and stress resistance. This chaperone slows aging in normal cells but enhances malignancy in transformed cells.

Area of Science:

  • Cellular biology
  • Gerontology
  • Molecular biology

Background:

  • Aging involves cellular damage and protein aggregation, linked to age-associated diseases.
  • Small heat shock proteins (sHsps) are chaperones that manage protein aggregates.
  • Mitochondrial DmHsp22 in Drosophila melanogaster increases with age and extends lifespan when overexpressed.

Purpose of the Study:

  • To investigate the mechanisms behind DmHsp22's lifespan extension in vivo.
  • To identify molecular differences in flies overexpressing DmHsp22.
  • To explore the dual effects of DmHsp22 on aging and cellular transformation.

Main Methods:

  • Genome-wide transcriptional analysis.
  • Comparative mitochondrial proteomic analysis using MALDI-TOF.
  • Overexpression of DmHsp22 in Drosophila melanogaster and human fibroblasts.

Main Results:

  • DmHsp22 overexpression upregulated genes involved in energy production and protein biosynthesis.
  • Flies overexpressing DmHsp22 showed extended lifespan and stress resistance.
  • DmHsp22 slowed aging in normal fibroblasts but increased malignancy in transformed cells.

Conclusions:

  • DmHsp22 influences aging through effects on energy and protein synthesis pathways.
  • The small chaperone DmHsp22 exhibits a dual role, beneficial in aging but potentially harmful in cancer progression.
  • Further research is needed to understand the balance of DmHsp22's beneficial and detrimental effects.

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