Published in the journal Brain, Behavior, and Immunity, the research conducted by UVA’s Alban Gaultier and collaborators marks a significant breakthrough.
By specifically identifying the role of Lactobacillus, a bacterium found in fermented foods, the study distinguishes it from the broader spectrum of microorganisms constituting the human microbiota. This discovery not only opens avenues for novel therapies targeting anxiety, depression, and other mental health conditions but also represents a crucial advancement in microbiota-focused research. The findings offer a pioneering approach for scientists to delve into the distinctive roles of individual microbes, paving the way for the development of innovative treatments and potential cures for a range of diseases, encompassing both mental and physical health.
Gaultier, affiliated with UVA’s Department of Neuroscience, its Center for Brain Immunology and Glia, and the TransUniversity Microbiome Initiative, emphasized that their findings shed light on the impact of gut-resident Lactobacillus on mood disorders through its modulation of the immune system. This research holds the potential to lay the foundation for the development of essential therapeutics targeting anxiety and depression.
Microbiota & depression
Our gastrointestinal tracts naturally harbor an abundance of bacteria, fungi, and viruses, surpassing the number of cells in our bodies. While this might evoke discomfort, scientists emphasize the crucial role these myriad microorganisms play in our immune systems, overall health, mental well-being, and various aspects of our overall well-being.
The disruption of the microbiota, whether due to illness, a suboptimal diet, or other factors, is recognized for its contribution to numerous diseases, including aiding the spread of cancer. Hence, researchers have been increasingly enthusiastic about the potential to combat diseases by targeting the microbiota. Initial efforts to influence gut flora using beneficial bacteria, known as probiotics, have yielded mixed results. The challenge lies in the intricate complexity of the microbiome, estimated to encompass a staggering 39 trillion microorganisms. Deciphering the specific functions of individual bacteria or fungi and understanding their interactions with other microorganisms and the host has proven to be as daunting as counting grains of sand on a beach.
Adopting an innovative strategy, Gaultier and his research team directed their attention specifically to Lactobacilli. Earlier studies from Gaultier’s laboratory hinted at the potential of these bacteria to alleviate depression in laboratory mice, presenting a highly encouraging discovery. However, the researchers faced the task of unraveling the mechanisms behind this phenomenon and understanding how Lactobacilli exerted their antidepressant effects.
From their previous investigations, the research team had established that Lactobacillus played a positive role in ameliorating mood disorders and was depleted under conditions of psychological stress. Despite this knowledge, the specific reasons behind this phenomenon remained elusive. The complexities of studying the microbiome, coupled with technical challenges, had hindered a comprehensive understanding of the underlying mechanisms.
Continuing their exploration into depression, Gaultier and his team opted for an unconventional approach, utilizing a bacterial consortium known as the “Altered Schaedler Flora.” This collection comprised two Lactobacillus strains along with six other bacterial strains, allowing the team to engineer mice with and without Lactobacillus without resorting to antibiotic interventions.
The outcomes from the Altered Schaedler Flora experiments proved promising. Gaultier and his colleagues successfully elucidated the precise mechanisms through which Lactobacilli influence behavior. They found that these bacteria, specifically from the Lactobaccillacea family, play a crucial role in maintaining optimal levels of an immune mediator called interferon gamma. This mediator regulates the body’s response to stress and acts as a protective factor against depression.
Equipped with this knowledge, researchers are now better positioned to explore innovative approaches for preventing and treating depression and other mental health conditions where Lactobacillus is a significant contributor. For instance, individuals dealing with depression or at risk of it might one day benefit from specially formulated probiotic supplements designed to enhance the levels of beneficial Lactobacillus.
Researcher Andrea R. Merchak, commenting on the obtained results, highlighted the newfound tools available for refining the development of probiotics. These advancements are expected to accelerate the discovery of innovative therapies. Of utmost significance is the potential to investigate how sustaining a healthy balance of Lactobacillus and/or interferon gamma could be explored as a preventive and therapeutic approach for anxiety and depression.
Resources
- ONLINE NEWS Barney, J. & University of Virginia. (2023, November 28). The way to better mental health may go through your stomach. Medical Xpress. [Medical Xpress]
- JOURNAL Merchak, A. R., Wachamo, S., Brown, L. C., Thakur, A., Moreau, B., Brown, R., Rivet-Noor, C., Raghavan, T. P., & Gaultier, A. (2024). Lactobacillus from the Altered Schaedler Flora maintain IFNγ homeostasis to promote behavioral stress resilience. Brain Behavior and Immunity, 115, 458–469. [Brain Behavior and Immunity]
Cite this page:
APA 7: TWs Editor. (2023, November 29). How Your Stomach Affects Your Mental Health? PerEXP Teamworks. [News Link]
