Antioxidant overload may underlie a heritable human disease

Aug 09, 2007

Despite the popular notion that antioxidants, such as vitamins C and E, offer health-promoting benefits by protecting against damaging free radicals, a new study in the August 10 issue of the journal Cell reveals that, in fact, balance is the key. The researchers show in mice that an overload of natural antioxidants can actually lead the heart to failure.

There is plenty of evidence about the damaging effects of oxidative stress, but “there is another side to the coin,” said Ivor Benjamin of the University of Utah, Salt Lake City. “There has been so much emphasis on free radicals to the exclusion of the potential consequences of reductants. Our study provides the first bona fide example of the role that reductive stress can play in disease.”

Reductants, sometimes referred to as antioxidants, are elements or compounds that easily give up an electron to become “oxidized,” while oxidizing agents readily accept electrons. In the body, such oxidation-reduction (redox) reactions are integral to the release and storage of energy. Many cellular pathways are also sensitive to the prevailing redox condition.

Oxidative stress, which consumes reducing equivalents, has been often implicated in numerous cardiac and other diseases, Benjamin noted. However, the possibility remained that an inverse imbalance could provoke reductive stress, with the potential for similar deleterious effects. Indeed, reductive stress had been demonstrated in simpler organisms but not in mammals and/or disease states, he said.

In the current study, the researchers examined mice carrying a human mutation earlier linked to so-called protein aggregation skeletal myopathies and cardiomyopathies, in which weakening skeletal and heart muscle contain clumps of proteins. Although the genetic basis for the disease had been linked to mutations in one of two genes, the mechanism responsible remained mysterious.

The researchers now show that mice with one of the mutant genes, áB-crystallin, specifically in the heart develop the same symptoms seen in human patients, including heart enlargement, progressive heart failure, and an early death. They further show that the animals’ hearts are under reductive stress.

The find initially took Benjamin by surprise, he said. They had conducted a test traditionally used to measure the level of oxidative stress in the animals, expecting they might see higher than normal levels. Instead, they found the mice had “markedly reduced” oxidative stress levels due to an abundance of a natural antioxidant known as glutathione.

The mutant mouse hearts exhibited a heightened stress response, including higher activity of heat shock proteins that have been documented in human heart failure, Benjamin explained. Such stress responses yield reactive oxygen species, triggering antioxidative pathways to kick in. In the diseased animals, however, that pathway—in which oxidized glutathione is recycled to its reduced, antioxidant form—soon got out of hand, producing excess levels of the reduced glutathione and a condition of reductive stress.

Moreover, they showed that the offspring of the heart-diseased animals and mice with lower levels of one of the antioxidant enzymes, glucose-6-phosphate dehydrogenase (G6PD), were relieved of their symptoms. That finding suggests that drugs or other treatments targeting the antioxidant pathway through G6PD “might modify the phenotype and the natural history of this inherited disorder in humans,” according to the researchers.

The results found in the heart suggest that reductive stress might underlie other diseases, as well. “Our findings open up a whole new line of investigation in protein aggregation diseases,” including neurodegenerative diseases such as Alzheimer’s and Huntington’s disease, Benjamin said.

Source: Cell Press

Explore further: Stem cells faulty in Duchenne muscular dystrophy

add to favorites email to friend print save as pdf

Related Stories

Passengers boarding airplanes—we're doing it wrong

Nov 26, 2014

'Tis the season for airplane travel. We may be looking forward to getting where we're going, but most aspects of the travel itself are merely endured. There's stressful security, the madding crowd and the ...

US proposes stricter ozone limits

Nov 26, 2014

The US Environmental Protection Agency announced plans Wednesday to strengthen emission regulations for ozone, a smog-causing pollutant blamed for respiratory ailments affecting millions of Americans.

EU sets new energy savings target at 30%

Jul 23, 2014

After months of tough negotiations, the European Commission recommended Wednesday a new energy savings target of 30 percent so as to combat climate change and ensure self-sufficiency.

Recommended for you

Stem cells faulty in Duchenne muscular dystrophy

15 hours ago

Like human patients, mice with a form of Duchenne muscular dystrophy undergo progressive muscle degeneration and accumulate connective tissue as they age. Now, researchers at the Stanford University School of Medicine have ...

Here's how the prion protein protects us

20 hours ago

The cellular prion protein (PrPC) has the ability to protect the brain's neurons. Although scientists have known about this protective physiological function for some time, they were lacking detailed knowledge ...

Regulation of maternal miRNAs in early embryos revealed

21 hours ago

The Center for RNA Research at the Institute for Basic Science (IBS) has succeeded in revealing, for the first time, the mechanism of how miRNAs, which control gene expression, are regulated in the early embryonic stage.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.