Microbiome and immunity: a key biological interaction for human health

Biological Alliance: How the Microbiome Maintains Immune Balance

The microbiome is a complex community of microorganisms that inhabit the human body, especially the gut. Its interaction with the immune system is two-way: the immune system controls the microbiota, and the microbiota trains the immune system. This symbiotic interaction begins at birth and continues throughout life.

Modern science confirms that a full immune response is impossible without a healthy microflora. The formation of tolerance to non-aggressive agents, anti-inflammatory control, effective protection against pathogens - all this depends on the composition and activity of the microbiome.

Formation of the immune system under the influence of microbiota

In newborns, the microbiota begins to form immediately after birth. The method of birth (natural birth or cesarean section), breastfeeding, contact with the environment - all this determines the early composition of the microflora. It is during this period that the initial “training” of immunity takes place:

• maturation of intestinal lymphoid tissue (GALT)

• stimulation of the production of IgA - a protective immunoglobulin of the mucous membranes

• formation of T-regulatory cells responsible for immune tolerance

• synthesis of signaling molecules (interleukins, interferons) that regulate the inflammatory response

Interaction in the adult body

In adulthood, the microbiome functions as a stabilizer of immune homeostasis. Its bacterial metabolites, including butyrate, propionate, and acetate, reduce the expression of pro-inflammatory genes, enhance the barrier function of the intestinal epithelium, and reduce the activity of harmful microorganisms.

Research indicates that The microbiome is essential for immune memory, as it modulates T-cell activation and optimizes the response to vaccination. For example, the level of effectiveness of the flu vaccine is directly correlated with the state of the intestinal microflora.

Examples of microbiome-related immune disorders

Disruption of the microbiota balance (dysbiosis) is associated with a number of diseases:

• Allergic reactions — reduced bacterial diversity in children increases the risk of asthma and atopy

• Autoimmune diseases — changes in microflora in patients with rheumatoid arthritis, type 1 diabetes

• Infectious diseases - deficiency of bacteria that activate the antiviral response (e.g., in COVID-19)

• Immunodeficiencies — prolonged antibiotic therapy reduces IgA production

The main mechanisms of the microbiome's influence on immunity

Supporting immune function through the microbiome

Maintaining a healthy microbiome means maintaining a strong immune system. To do this, you need to:

• to use regularly prebiotics (fiber, inulin, resistant starch)

• comprise fermented foods (natural yogurt, kefir, kimchi, kombucha)

• reduce consumption refined sugar and emulsifiers

• avoid unjustified use of antibiotics

• to provide physical activity and quality sleep

• reduce stress, which disrupts the bacterial balance

Sources

• WHO – Human microbiome and health

• Mayo Clinic – Gut bacteria and immunity

• Nature Immunology – Gut microbiota as a regulator of immunity

• FDA – Regulation of microbiome-based therapies

The microbiome is not just part of the digestive system. It is a full-fledged immune regulator that influences our health on a daily basis. Supporting it is a strategy not only for disease prevention, but also for overall immune balance.