Gut Microbiota and Asthma: Link and Future Treatment

What Is Gut Microbiota?

Your gut consists of several tiny microorganisms. A miniature world inside your intestines, packed with trillions of microscopic critters. It is not just bacteria – though there are over a thousand different types of microorganisms, including viruses, fungi, and even some parasites. This internal ecosystem is your gut microbiome. Newborn babies get their first microbes during birth or when they are breastfed. As you grow up, everything you eat and experience new microscopic settlers into the mix. But watch out – some microorganisms can rough up your gut, knocking out some good microorganisms.

How Does Microbiota Influence Respiratory Health?

Let's discuss how the tiny microorganisms living in our airways can greatly affect our breathing. It feels awkward when you consider that these microorganisms are like our own personal bodyguards for our lungs!

There are several bacteria present in our respiratory system. When everything's in balance, these microorganisms help us. They keep harmful bacteria out. Plus, they constantly protect our immune system, teaching it how to react to different threats.

The imbalance of microorganisms can cause diseases from asthma to pneumonia.

1. Immune System Development: The friendly microorganisms protect our immune system from any foreign microorganisms.

2. Germ Fighters: Healthy microorganisms in our airways can outcompete the harmful ones, keeping infections away.

3. Mucus Management: These microbes help produce the mucus to keep our airways protected.

4. The Gut-Lung Connection: The bacteria in our gut can influence our lung health.

The imbalance of microorganisms is called dysbiosis, and it can cause problems:

• We become more susceptible to infections.

• Allergies might start acting up.

• Chronic lung diseases could develop or get worse.

What Is the Link Between the Gut Microbiota and Allergies?

The gut microbiome is strongly related to allergic diseases. When the gut microbiota is imbalanced, allergies, asthma, or eczema can occur.

1. Immune System Development: Your gut is important for immune system development. It teaches your body how to deal with harmful bacteria like allergens.

2. Barrier Function: A healthy gut microbiome keeps the intestinal wall strong, making sure no sneaky allergens enter your bloodstream.

3. T-Reg Cells: Some of the friendly bacteria in your gut always keep everyone calm. They help produce T-reg cells, which tell your immune system to relax.

4. Dysbiosis and Allergy Risk: If your gut microbiome is messed up, you are more likely to develop allergies. This can be caused by cesarean delivery, poor diet, or antibiotic use.

5. Early Life Exposure: The first few years of life are super important for your gut and allergy risk. Breastfeeding and natural birth give your gut microbiome a better start in life.

What Is the Link Between the Gut Microbiota and Asthma?

Gut microbiota modulates the immune system response. The microorganisms present in your gut include Firmicutes, Bacteroides, and Prevotella. The gut microbiota can ferment substances like dietary fiber to form acetate, propionate, and butyrate, also called short-chain fatty acids (SCFs). These bind to the cytokines and chemokines to influence lung immunity. Dysregulation in the gut microbiome can disrupt pulmonary immunity.

The variety and relative quantity of intestinal microbes, the gut metabolites, such as amino acids, butyrate, and other SCFAs, also differ between those with asthma and those without asthma. Children with asthma have lower stool butyrate levels, which are inversely connected with serum IgE levels. This implies that the uptake of allergens in allergic asthma may be facilitated by decreased butyrate synthesis and the ensuing disruption in intestinal epithelial barrier function, promoting allergen uptake in the case of allergic asthma.

Adult asthmatics have also been shown to have similar changes in their gut microbiome. Adult patients with bronchial asthma have altered gut microbiota, with a higher percentage of Proteobacteria and a lower percentage of bacteria that can produce butyrate and acetate. Reduced gut microbial diversity, decreased relative abundance of friendly microorganisms, and decreased SCFA-producing bacteria are the key changes in gut microbiota associated with asthma.

How can we manage this? A gut microbiome therapy for asthma. This therapy manipulates the composition of the bacteria in your gut and influences immune response.

How Key Microbial Species Linked to Allergies and Asthma?

Imbalances in the gut microbiome caused by bacteria like Lactobacillus can also contribute to allergic responses by affecting immune system development during early life. Streptococcus, Haemophilus, and Moraxella species are important microbial species linked to allergies and asthma. These species are frequently found in the respiratory tract, and early colonization of these bacteria may increase the chances of asthma, allergies, and recurrent wheezing.

What Are the External Factors That Affect Gut Microbiota and Allergic Diseases?

The external or environmental factors that affect the gut microbiome and allergic diseases are as follows:

• Antibiotics.

• Synthetic chemicals.

• Indoor air pollution.

• Inhaled pollutants.

• Environmental tobacco smoke.

• Diet changes.

• Climate change affecting the distribution of allergens like pollen and mold.

• Outdoor air pollution, like some vehicles, emits large quantities of harmful gases like carbon dioxide, nitrous oxide, carbon monoxide, and hydrocarbons.

What Are the Future Treatments and Microbiome-Based Interventions?

The future treatments and microbiome-based interventions are described below:

• Probiotics: They are live organisms that, when given adequate quantities, elicit beneficial responses in human beings by balancing the gut microbiota. They help decrease the ill effects of dysbiosis and promote a diverse microbial community. They also help regulate immune cells and help in preventing allergies and asthma.

• Fecal Microbiota Transplantation: During this procedure, the feces from a person with a strong immune system is transferred to a sick person as part of this therapeutic method to replenish the lost gut flora. This helps restore the microbial balance. It has been studied to check its immunomodulatory effects in allergic reactions and asthma.

• Prebiotics: These are present in some dietary products and help the growth of beneficial or friendly bacteria.

Conclusion

Asthma and the microbiota have a complicated relationship, while there is evidence that certain commensal microbes may be important in the onset of asthma. Antibiotic use during the first year of life and throughout one's lifetime is significantly correlated with the incidence of asthma. Having older children in the home has been shown to promote immune system development and gut microbiota maturation, which may lower the risk of asthma in younger residents.

Microbial dysbiosis promotes opportunistic pathogen invasion brought on by unbalanced immune responses; it may create disruptions in the inflammatory system and contribute to the emergence of allergy disorders, particularly asthma. The effectiveness of several treatment approaches for asthma has been the subject of extensive investigation. More high-caliber research is required to make certain conclusions, but prebiotics, probiotics, and specific dietary practices may have a preventative or therapeutic effect.

A Key Note From iCliniq:

The microbiota and asthma have a strong link. They interact with the immune system and affect the lungs. However, some treatment and preventive strategies can help regulate the immune system and alleviate asthma symptoms.

• Modulating the gut bacteria along with immunotherapy helps prevent many allergies.

• Take probiotics that will help decrease the ill effects of dysbiosis and promote a diverse microbial community.

• A healthier lifestyle in terms of a balanced diet, adequate hydration and sleep, stoppage of junk, processed foods, and unhealthy habits like smoking and drinking alcohol not only helps restore the gut microbiota balance but also has a direct impact on allergic reactions and asthma triggers.