Scientists at the Gladstone Institutes have identified a novel mechanism by which a type of low-carb, low-calorie diet — called a “ketogenic diet” — could delay the effects of aging: the compound  β-hydroxybutyrate (βOHB), a “ketone body” that is generated during a prolonged low-calorie or ketogenic diet.

Blocking oxidative stress

While ketone bodies such as βOHB can be toxic when present at very high concentrations in people with diseases such as Type I diabetes, researchers in the laboratory of Gladstone Senior Investigator Eric Verdin, MD found that at lower concentrations, βOHB actually helps protect cells from “oxidative stress” — which occurs as certain molecules build to toxic levels in the body and contributes to the aging process.

This fundamental discovery reveals how such a diet could slow the aging process and may one day allow scientists to better treat or prevent age-related diseases, including heart disease, Alzheimer’s disease, and many forms of cancer.

“Over the years, studies have found that restricting calories slows aging and increases longevity — however the mechanism of this effect has remained elusive,” Dr. Verdin said. He directs the Center for HIV & Aging at Gladstone and is also a professor at the University of California, San Francisco, with which Gladstone is affiliated. “Here, we find that βOHB — the body’s major source of energy during exercise or fasting — blocks a class of enzymes that would otherwise promote oxidative stress, thus protecting cells from aging,” he said.

Oxidative stress occurs as cells use oxygen to produce energy, but this activity also releases other potentially toxic molecules, known as free radicals. As cells age, they become less effective in clearing these free radicals — leading to cell damage, oxidative stress, and the effects of aging.

Slowing the detrimental effects of aging

However, Dr. Verdin and his team found that βOHB might actually help delay this process. In a series of laboratory experiments — first in human cells in a dish and then in tissues taken from mice — the team monitored the biochemical changes that occur when βOHB is administered during a chronic calorie-restricted diet. The researchers found that calorie restriction spurs βOHB production, which blocked the activity of a class of enzymes called histone deacetylases, or HDACs.

Normally HDACs keep a pair of genes, called Foxo3a and Mt2, switched off. But increased levels of βOHB block the HDACs from doing so, which by default activates the two genes. Once activated, these genes kick-start a process that helps cells resist oxidative stress. This discovery not only identifies a novel signaling role for βOHB, but it could also represent a way to slow the detrimental effects of aging in all cells of the body.

“This breakthrough also greatly advances our understanding of the underlying mechanism behind HDACs, which had already been known to be involved in aging and neurological disease,” said Gladstone Investigator Katerina Akassoglou, PhD, an expert in neurological diseases and one of the paper’s co-authors. “The findings could be relevant for a wide range of neurological conditions, such as Alzheimer’s, Parkinson’s, autism and traumatic brain injury — diseases that afflict millions and for which there are few treatment options.”

“Identifying βOHB as a link between caloric restriction and protection from oxidative stress opens up a variety of new avenues to researchers for combating disease,” said Tadahiro Shimazu, a Gladstone postdoctoral fellow and the paper’s lead author. “In the future, we will continue to explore the role of βOHB — especially how it affects the body’s other organs, such as the heart or brain — to confirm whether the compound’s protective effects can be applied throughout the body.”

As the aging population continues to grow, age-related illnesses have become increasingly common. Already in the United States, nearly one in six people are over the age of 65. Heart disease continues to be the nation’s number one killer, with cancer and Alzheimer’s close behind.

This research was supported by the Gladstone Institutes..