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09:42
Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
Published on: September 7, 2017
Persistent transcription-blocking DNA lesions trigger somatic growth attenuation associated with longevity
George A Garinis1, Lieneke M Uittenboogaard, Heike Stachelscheid
1MGC Department of Cell Biology and Genetics, Center for Biomedical Genetics, Erasmus Medical Center, PO Box 1738, Rotterdam 3000 DR, The Netherlands.
Nature Cell Biology
|April 14, 2009
Summary
Accumulated DNA damage causes gene expression changes mimicking aging. This damage reduces insulin-like growth factor-1 (IGF-1) and growth hormone (GH) receptor signaling, promoting stress resistance and potentially longevity.
Area of Science:
- Molecular Biology
- Genetics
- Aging Research
Background:
- Aging is linked to accumulated DNA damage and regulated by genetic pathways like IGF-1 and GH.
- Somatic growth is mediated by the insulin-like growth factor-1 (IGF-1) and growth hormone (GH) receptors.
Purpose of the Study:
- To investigate the impact of persistent DNA damage on gene expression and cellular aging.
- To explore the relationship between DNA damage, IGF-1/GH signaling, and stress resistance.
Main Methods:
- Inducing persistent DNA damage in primary mouse cells.
- Analyzing global gene expression changes.
- Assessing cellular responses to IGF-1 and oxidative stress.
Main Results:
- Persistent DNA damage induced gene expression patterns similar to natural aging.
- DNA damage attenuated IGF-1 and GH receptor expression, causing cellular IGF-1 resistance.
- This effect was observed across proliferating, quiescent, and differentiated cells and was exacerbated in progeroid models.
Conclusions:
- Persistent DNA damage in transcribed genes contributes to aging-associated shifts from growth to somatic maintenance.
- This shift confers stress resistance and may promote longevity.
- Cellular IGF-1 resistance induced by DNA damage is a key mechanism in the aging process.
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