Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Search research articles

Related Experiment Videos

The reductive hotspot hypothesis: an update.

¹Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, United Kingdom. ag24@gen.cam.ac.uk

Archives of Biochemistry and Biophysics

|January 6, 2000

Summary

Mitochondrial DNA mutations may cause aging by creating cellular "hotspots" of oxidative stress. This "reductive hotspot hypothesis" suggests extracellular superoxide from mutant cells amplifies damage, impacting systemic health.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

A proposed mechanism for the lowering of mitochondrial electron leak by caloric restriction.

Mitochondrion·2005

Same author

UK research on the biology of aging.

Experimental gerontology·2001

Same author

Gerontologists and the media: the dangers of over-pessimism.

Biogerontology·2001

Same author

Redox 2000: the 5th international conference on plasma membrane redox systems and their role in biological stress and disease.

Antioxidants & redox signaling·2001

Same author

Antioxidants and redox signaling: Internet resources.

Antioxidants & redox signaling·2001

Same author

Mitochondrial gene therapy: an arena for the biomedical use of inteins.

Trends in biotechnology·2000

Area of Science:

Gerontology
Mitochondrial Biology
Oxidative Stress

Background:

The mitochondrial free radical theory of aging is challenged by low levels of mutant mitochondrial DNA (mtDNA) in vivo.
Mitochondria are implicated in free radical damage, yet mice lacking certain superoxide dismutase isoforms remain healthy.
The systemic impact of low-level mutant mtDNA requires investigation due to its mosaic distribution.

Purpose of the Study:

To investigate the potential systemic effects of low-level mutant mtDNA.
To explore the "reductive hotspot hypothesis" linking mutant mtDNA to amplified oxidative stress.

Main Methods:

Review of existing evidence on mutant mtDNA abundance and distribution.
Analysis of cellular ATP production mechanisms (aerobic respiration vs. glycolysis).
Consideration of plasma membrane oxidoreductase (PMOR) function and potential electron acceptors.

Main Results:

Mutant mtDNA is typically not abundant in vivo, but its mosaic distribution creates cells lacking aerobic respiration.
These cells may rely on glycolysis, requiring PMOR for survival.
Extracellular superoxide formation by mutant cells, potentially reducing transition metals and oxidizing LDL, is proposed.

Conclusions:

The "reductive hotspot hypothesis" offers a model where localized superoxide production amplifies systemic oxidative stress.
This hypothesis provides a potential explanation for aging mechanisms despite low mutant mtDNA levels.
Further direct experimental testing of the reductive hotspot hypothesis is feasible.

Related Experiment Videos