
Seki et al. have established a comprehensive, time-resolved profile of microbiota, immune, and neurophysiological development in premature infants. Their research linked early-life microbiome establishment to immunological and neurological development, identifying candidate biomarkers of perinatal brain injury. In summary (left), their results showed that pro-inflammatory T cell response correlates with suppressed electro-cortical maturation. γδ T cells seemed to have central implications for this suppression and the pathogenesis of brain injury. Furthermore, Klebsiella overgrowth in the gastrointestinal tract was highly predictive for brain damage. To the right, manifestations of such brain injuries are shown as representative cranial magnetic resonance (cMRI) images at term-equivalent age for intraventricular haemorrhage (IVH; upper right corner) and periventricular leukomalacia (PVL, lower right corner).
Extremely premature infants are at a high risk for brain damage. Researchers at the University of Vienna and the Medical University of Vienna have now found possible targets for the early treatment of such damage outside the brain: Bacteria in the gut of premature infants may play a key role. The research team found that the overgrowth of the gastrointestinal tract with the bacterium Klebsiella is associated with an increased presence of certain immune cells and the development of neurological damage in premature babies. The study is now published in journal Cell Host & Microbe.
Complex interplay: the gut-immune-brain axis
The early development of the gut, the brain and the immune system are closely interrelated. Researchers refer to this as the gut-immune-brain axis. Bacteria in the gut cooperate with the immune system, which in turn monitors gut microbes and develops appropriate responses to them. In addition, the gut is in contact with the brain via the vagus nerve as well as via the immune system. "We investigated the role this axis plays in the brain development of extreme preterm infants," says the first author of the study, David Seki. "The microorganisms of the gut microbiome - which is a vital collection of hundreds of species of bacteria, fungi, viruses and other microbes - are in equilibrium in healthy people. However, especially in premature babies, whose immune system and microbiome have not been able to develop fully, shifts are quite likely to occur. These shifts may result in negative effects on the brain," explains the microbiologist and immunologist.
Patterns in the microbiome provide clues to brain damage
"In fact, we have been able to identify certain patterns in the microbiome and immune response that are clearly linked to the progression and severity of brain injury," adds David Berry, microbiologist and head of the research group at the Centre for Microbiology and Environmental Systems Science (CMESS) at the University of Vienna as well as Operational Director of the Joint Microbiome Facility of the Medical University of Vienna and University of Vienna. "Crucially, such patterns often show up prior to changes in the brain. This suggests a critical time window during which brain damage of extremely premature infants may be prevented from worsening or even avoided."














Comment: See also: