Posts tagged ketogenic diet

A new study by scientists at McGill University and the University of Zurich shows a direct link between metabolism in brain cells and their ability to signal information. The research may explain why the seizures of many epilepsy patients can be controlled by a specially formulated diet. 

(Image caption: Neurons in the cerebellum. Credit: Bowie Lab/McGill University)

The findings, published Jan. 16 in Nature Communications, reveal that metabolism controls the processes that inhibit brain activity, such as that involved in convulsions. The study uncovers a link between how brain cells make energy and how the same cells signal information – processes that neuroscientists have often assumed to be distinct and separate. 

“Inhibition in the brain is commonly targeted in clinical practice,” notes Derek Bowie, Canada Research Chair in Receptor Pharmacology at McGill and corresponding author of the study. “For example, drugs that alleviate anxiety, induce anesthesia, or even control epilepsy work by strengthening brain inhibition. These pharmacological approaches can have their drawbacks, since patients often complain of unpleasant side effects.” 

The experiments showed an unexpected link between how the mitochondria of brain cells make energy and how the same cells signal information. Brain cells couple these two independent functions by using small chemical messengers, called reactive oxygen species (or ROS), that are normally associated with signaling cell death. While ROS are known to have roles in diseases of aging, such as Alzheimer’s and Parkinson’s, the new study shows they also play important roles in the healthy brain.  

The findings emerged from an ongoing collaboration between Prof. Bowie’s laboratory in McGill’s Department of Pharmacology and Therapeutics and a research team headed by Dr. Jean-Marc Fritschy, Professor of Pharmacology at the University of Zurich and current director of the Neuroscience Center Zurich (ZNZ). The researchers have the longer term aim of trying to understand why the seizures of many epilepsy patients — especially young children – can be treated with a high-fat, low-carbohydrate diet known as the ketogenic diet. 

The idea that diet can control seizures was noticed as far back as ancient Greece, during periods of fasting. From the 1920s until the 1950s, the ketogenic diet was widely used to treat epilepsy patients. With the introduction of anticonvulsant drugs in the 1950s, the dietary approach fell out of favour with doctors. But because anticonvulsant drugs don’t work for 20% to 30% of patients, there has been a resurgence in use of the ketogenic diet. 

“Since our study shows that brain cells have their own means to strengthen inhibition,” explains Prof Bowie, “our work points to potentially new ways in which to control a number of important neurological conditions including epilepsy.”

(Source: mcgill.ca)

(Image Credit: Stanford University)

A team of brain cancer researchers at Barrow Neurological Institute at St. Joseph’s Hospital and Medical Center has effectively treated brain tumor cells using a unique combination of diet and radiation therapy. The study, “The Ketogenic Diet Is an Effective Adjuvant to Radiation Therapy for the Treatment of Malignant Glioma,” was published in PLOS ONE.

Led by Adrienne C. Scheck, PhD, Principal Investigator in Neuro-Oncology and Neurosurgery Research at Barrow, the groundbreaking research studied the effects of the ketogenic diet in conjunction with radiation therapy for the treatment of malignant gliomas, an aggressive and deadly type of brain tumor. The ketogenic diet is a high-fat, low-carbohydrate diet that alters metabolism and is used in the treatment of pediatric epilepsy that does not respond to conventional therapies. The diet’s affects on brain homeostasis have potential for the treatment of other neurological diseases, as well.

In the study, mice with high-level malignant gliomas were maintained on either a standard or a ketogenic diet. Both groups received radiation therapy. Dr. Scheck’s team discovered that animals fed a ketogenic diet had an increased median survival of approximately five days relative to animals maintained on a standard diet. Of the mice that were fed a ketogenic diet and received radiation, nine of 11 survived with no signs of tumor recurrence, even after being switched back to standard food, for over 200 days. None on the standard diet survived more than 33 days.

One theory behind the success of the treatment is that the ketogenic diet may reduce growth factor stimulation, inhibiting tumor growth. Barrow scientists also believe that it may reduce inflammation and edema surrounding the tumors. This is believed to be the first study of its kind to look at the effects of the ketogenic diet with radiation.

Dr. Scheck believes that the study has promising implications in the treatment of human malignant gliomas. “We found that the ketogenic diet significantly enhances the anti-tumor effect of radiation, which suggests that it may be useful as an adjuvant to the current standard of care for the treatment of human malignant gliomas,” she says.

Dr. Scheck adds that the ketogenic diet could quickly and easily be added into current brain tumor treatment plans as an adjuvant therapy without the need for FDA approval. She is currently exploring options for clinical trials.

(Source: eurekalert.org)