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Characterizing the composition of intestinal microflora as a prospective treatment target in infant allergic disease
P V Kirjavainen1, E Apostolou, T Arvola
1Department of Biochemistry and Food Chemistry, University of Turku, Turku, Finland. pirkka.kirjavainen@utu.fi
Insights
Infants with atopic eczema show distinct gut bacteria, with fewer Gram-positive species. Weaning impacts gut microflora in both healthy and atopic infants, prompting further research into protective roles of Gram-positive bacteria.
Area of Science:
- Microbiology
- Immunology
- Pediatrics
Background:
- Atopic eczema is a common inflammatory skin condition in infants.
- The infant gut microbiome plays a crucial role in immune system development.
- Alterations in fecal microflora have been observed in various infant health conditions.
Purpose of the Study:
- To compare the fecal microflora composition between healthy infants and those with atopic eczema.
- To investigate the impact of breastfeeding and weaning on infant gut microbiota.
- To explore potential links between specific bacterial groups and atopic eczema severity.
Main Methods:
- Fecal samples were collected from 10 healthy infants and 27 infants with atopic eczema.
- Microflora analysis was performed during breastfeeding and post-weaning periods.
- Bacterial counts, including Gram-positive species, anaerobes, Bacteroides, and Bifidobacteria, were assessed.
Main Results:
- Atopic infants exhibited lower counts of Gram-positive aerobic species and overall lower total cell counts.
- Infants with more severe atopic eczema showed higher Bacteroides and lower Bifidobacteria counts.
- Weaning led to decreased Bacteroides in atopic infants and reduced total cell counts in healthy infants, with diminished Bifidobacteria predominance in both groups.
Conclusions:
- The study highlights significant differences in gut microbiota between healthy and atopic eczema infants.
- Gram-positive bacteria may play a protective role against atopic sensitization.
- Further research is warranted to elucidate the specific mechanisms and importance of Gram-positive bacteria in preventing atopic eczema.
Abstract:
We assessed the fecal microflora of 10 healthy infants and 27 infants with atopic eczema during breast-feeding and after weaning. The atopic infants had less frequently Gram-positive species among the most predominant aerobes and smaller total cell counts. Further differences were associated with more extensive manifestations, seen as higher bacteroides and lower bifidobacteria counts. Weaning resulted in decreased bacteroides counts in atopic and total cell counts in healthy infants and diminished predominance by bifidobacteria in both. In conclusion, the most prominent question raised by these data is whether Gram-positive bacteria may have distinctive importance in protection against atopic sensitization. Further studies aiming to answer this question are warranted.