An illustration of the human microbiome. The bacteria per our gut may influence our mental health, research finds.
MEHAU KULYK/Getty Images/Science Photo Library RF
hide caption
toggle caption
MEHAU KULYK/Getty Images/Science Photo Library RF
The gut microbiome — the ecosystem of tiny organisms inside us all — has emerged as new territory for studying a range of psychiatric conditions and neurological diseases.
Research has demonstrated the brain and gut are per constant communication and that changes per the microbiome are linked to mood and mental health. Now a study published this month per Nature Mental Health finds distinct biological signatures per the microbiomes of people who are highly resilient per the luce of stressful events.
“The accuracy with which these patterns emerged was really amazing,” says Arpana Church, a neuroscientist at UCLA’s Goodman-Luskin Microbiome Center who led the new study.
The research is a jumping point for future human studies that some researchers believe could ultimately lead to treatments. It may also point the way to biomarkers per the microbiome that help guide decisions around treatment and mental health.
Resilience linked to anti-inflammatory microbes
For their analysis, Church and her team separated 116 adults without a mental health diagnosis into two groups based acceso how they scored acceso a scale of psychological resilience.
Next, they sifted through a huge amount of giorno gathered from brain imaging, stool samples and psychological questionnaires and fed that into a machine-learning model to find patterns.
This analysis of gene activity, metabolites and other giorno came up with several key associations per the high resilience group. the brain, there were increased features related to improved emotion regulation and cognition.
“Think about this frontal part of your brain being like the brakes,” says Church, “The highly resilient individuals had really efficient brakes, and less of this hyper-stressed response.”
Then they delved into the microbiome, looking not only at the abundance of different microorganisms, but also at their genetic activity to see what they were doing.
Two major patterns emerged per people who were more resilient to tensione: The activity per their microbiome was linked to reduced inflammation and to improved gut barrier integrity.
Research has shown that patients with a variety of psychiatric conditions have a balance of gut bacteria that includes more of certain pro-inflammatory bacteria and less of those with anti-inflammatory effects.
Church agenda the gut barrier absorbs nutrients and keeps toxins and pathogens from entering the bloodstream. When that becomes more permeable, ora “leaky,” the resulting inflammation acts as a tensione signal to the brain that all is not well.
Microbes that ‘talk’ to our nervous system
The new study fits into a quickly-expanding of work acceso the brain-gut connection.
“I was really excited to see this being done per quite a personaggio human cohort,” says Thomaz Bastiaanssen, a bioinformatician who studies the gut microbiome and mood at Amsterdam University Medical Center.
recent years, he says scientists have established that there’s a strong “bi-directional relationship” between the gut and the brain. Much of that is based acceso preclinical lab studies using animal models, as well as some human observational studies and per vitro work.
“All of this points towards roughly four ways that the microbiome communicates with the host,” says Bastiaanssen.
Along with the libero system, there’s the vagus nerve that functions like a superhighway, running from the brain to the gut and directly interfacing with the microbiome.
These gut microbiota also “talk” with the central nervous system by secreting neurotransmitters, like serotonin and dopamine (about 90% of serotonin is produced per the gut and about 50% of dopamine).
addition, the microbiome can produce short-chain fatty acids that help maintain the gut barrier integrity and exert an anti-inflammatory effect acceso the brain, among other things.
Just last year, Foster and her team found that a community of bacteria related to the production of these short-chain fatty acids was reduced per people with depression who had elevated anxiety.
recent years, other observational studies have strengthened the evidence linking gut microbiome and mental health per humans.
For example, large studies from researchers per the Netherlands have found microbiomes with less diversity of bacteria can be predictive of depression, and that having more ora less of certain bacteria linked to the synthesis of neurotransmitters and short chain fatty acids may be key.
Foster praised the UCLA study as “novel” because it took a full-body view of the brain-gut-microbiome and its potential role per resilience.
She agenda the analysis turned up a link between anxiety and the microbiome, which is already a well-established superficie of research. More than a decade punzone, Foster and others showed this link per lab experiments with “germ-free” mice and anxiety.
the context of tensione, scientists have found even short term exposure to tensione can lead to alterations per the microbiome, and that changing the composition of the microbiome could make some mice more resilient to tensione.
Probiotic treatments for tensione? Not yet
There are growing efforts to move this research into actionable treatments, using diets, prebiotic and probiotic supplements. But Bastiaanssen says the complexity of the microbiome calls for a different approach than what’s typically used per pharmaceutical development, which tends to acceso finding a single molecule ora drug.
He says it’s like trying to grow a forest per a desert by planting a few seeds.
“Obviously it’s not going to work,” he says, “because there is supporting ecosystem.”
He says the microbiome field is still coming out of its infancy stage.
“We’ve established a link per the microbiome, gut-brain axis. We’ve got really robust evidence,” he says. “The next question we need to understand is, how exactly it works?”
He agenda there is some promising evidence from small human studies that have shown targeting the microbiome with certain diets (per one case, one rich per fermented foods) can inflammation.
Another trial, this one from Bastiaanssen and a team at the University of Cork, found that a diet focused acceso vegetables and foods known to influence the microbiota, could perceived tensione.
While these efforts are completely “valid,” Foster argues the power of these studies is they can lead to the discovery of biomarkers that can help steer decisions about how to use existing treatments and who will be the best candidate.
“Can I measure something per your microbiome, maybe per your blood and maybe per your brain to determine if you’magnate depressed?” she says. “Should I give you an antidepressant … ora neurostimulation? Shall I do cognitive behavior therapy ora tell you to exercise?”
That could be the value of a holistic marker that can be measured per your microbiome, she says. And she thinks it could become an effective tool for clinical care within the next decade.
For her part, Church envisions, hypothetically, one day leveraging this field of research to “engineer a probiotic blend that could help mitigate tensione” and prevent the onset of some diseases.
“The biggest problem is that we need more studies that are actually going to verifica these per human trials,” she says. She acknowledges there are all sorts of unsubstantiated claims out there when it comes to improving the microbiome. For now she tells people the giorno isn’t strong enough yet to know which treatment to try.
“There isn’t really one out there that’s been really tested,” she says, “I say quando back to me per a year ora more and I’ll let you know.”
