2011 Press Releases
29.08.2011
Probiotic bacteria have the potential to alter brain neurochemistry and treat anxiety and depression-related disorders according to research published today in the prestigious international journal Proceedings of the National Academy of Sciences USA. The research, carried out by Dr Javier Bravo, and Professor John Cryan at the Alimentary Pharmabiotic Centre (APC) in University College Cork, along with collaborators from the Brain-Body Institute at McMaster University in Canada, demonstrated that mice fed with Lactobacillus rhamnosus JB-1 showed significantly fewer stress, anxiety and depression-related behaviours than those fed with just broth. Moreover, ingestion of the bacteria resulted in significantly lower levels of the stress-induced hormone, corticosterone.
“This study identifies potential brain targets and a pathway through which
certain gut organisms can alter mouse brain chemistry and behaviour. These
findings highlight the important role that gut bacteria play in the
bidirectional communication between the gut and the brain, the gut–brain axis,
and opens up the intriguing opportunity of developing unique microbial-based
strategies for treatment for stress-related psychiatric disorders such as
anxiety and depression”, said John F. Cryan, senior author on the publication
and Professor of Anatomy and Principal Investigator at the Science Foundation
Ireland funded Alimentary Pharmabiotic Centre, at UCC. The APC researchers
included Dr Hélène
Savignac and Professor Ted Dinan.
The researchers also showed that regular feeding with the Lactobacillus strain
caused changes in the expression of receptors for the neurotransmitter GABA in
the mouse brain, which is the first time that it has been demonstrated that
potential probiotics have a direct effect on brain chemistry in normal
situations. The authors also established that the vagus nerve is the main relay
between the microbiome (bacteria in the gut) and the brain. This three way communication
system is known as the microbiome-gut-brain axis and these findings highlight
the important role of bacteria in the communication between the gut and the
brain, and suggest that certain probiotic organisms may prove to be useful
adjunct therapies in stress-related psychiatric disorders.
Picture: Professor John Cryan, Alimentary Pharmabiotic Centre, UCC