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A mixture of prebiotic oligosaccharides reduces the incidence of atopic dermatitis during the first six months of age

¹ Center for Infant Nutrition, Macedonio Melloni Maternity Hospital, Milan, Italy
² Numico Research Germany, Friedrichsdorf, Germany
³ Charité Campus Virchow Klinikum, Berlin, Germany
⁴ Sophia Children’s Hospital, Erasmus University, Rotterdam, Netherlands

Correspondence to:
Correspondence to:
Prof. Dr. med. habil. G Boehm
Numico Research Germany, Bahnstr. 14–30, 61381 Friedrichsdorf, Germany; guenther.boehm{at}milupa.de

Accepted for publication 19 June 2006

	ABSTRACT

TOP ABSTRACT STUDY POPULATION AND METHODS RESULTS DISCUSSION REFERENCES

 
Background: Oligosaccharides may alter postnatal immune development by influencing the constitution of gastrointestinal bacterial flora.

Aims: To investigate the effect of a prebiotic mixture of galacto- and long chain fructo-oligosaccharides on the incidence of atopic dermatitis (AD) during the first six months of life in formula fed infants at high risk of atopy.

Methods: Prospective, double-blind, randomised, placebo controlled trial; 259 infants at risk for atopy were enrolled. A total of 102 infants in the prebiotic group and 104 infants in the placebo group completed the study. If bottle feeding was started, the infant was randomly assigned to one of two hydrolysed protein formula groups (0.8 g/100 ml prebiotics or maltodextrine as placebo). All infants were examined for clinical evidence of atopic dermatitis. In a subgroup of 98 infants, faecal flora was analysed.

Results: Ten infants (9.8%; 95 CI 5.4–17.1%) in the intervention group and 24 infants (23.1%; 95 CI 16.0–32.1%) in the control group developed AD. The severity of the dermatitis was not affected by diet. Prebiotic supplements were associated with a significantly higher number of faecal bifidobacteria compared with controls but there was no significant difference in lactobacilli counts.

Conclusion: Results show for the first time a beneficial effect of prebiotics on the development of atopic dermatitis in a high risk population of infants. Although the mechanism of this effect requires further investigation, it appears likely that oligosaccharides modulate postnatal immune development by altering bowel flora and have a potential role in primary allergy prevention during infancy.

Abbreviations: AD, atopic dermatitis; FOS, fructo-oligosaccharides; GOS, galacto-oligosaccharides; HMOS, human milk oligosaccharides

Keywords: infant nutrition; prebiotics; atopic dermatitis

The prevalence of atopic diseases has steadily increased during the last decade in developed countries.^1–3 The composition of the intestinal flora plays a key role in postnatal development of the immune system.⁴ In human milk, neutral oligosaccharides are an important factor that promotes an intestinal flora dominated by bifidobacteria and lactobacilli.^5,6 Based on the analysis of human milk oligosaccharides, a prebiotic mixture of 90% short chain galacto-oligosaccharides (GOS) and 10% long chain fructo-oligosaccharides (FOS) has been developed.^7,8 Studies in preterm⁹ and term ^10–12 infants have shown that feed supplementation with GOS/FOS produces an intestinal flora similar to that found in breast fed infants. Atopic dermatitis (AD) is usually the first manifestation of allergy during early infancy. It has been reported that AD is associated with delayed maturation of TH1 immune responses during early infancy with raised total IgE and specific IgE to dietary antigens in the serum.¹³ Infants with early onset allergic disease are also at risk of other manifestations of allergic disease, a phenomenon described as the allergic march.¹⁴ The intestinal flora is part of a complex ecosystem and many of its constituent bacteria remain unidentified.¹⁵ However, there is strong evidence that the intestinal flora influences the postnatal development of the immune system.¹⁶ Stimulation of the entire intestinal flora by prebiotics might be a more effective method of altering immune development than by adding a single bacterial species to the intestinal ecosystem. However, positive results with probiotics¹⁷ have been reported. The present study was designed to investigate the effect of supplementing infant formula feed with 0.8 g/100 ml of a mixture of GOS/FOS on the incidence of AD during the first six months of life. We hypothesised that the prebiotic formula would significantly reduce the cumulative incidence of AD in high risk infants at 6 months of age compared with an unsupplemented control group fed an identical formula.

	STUDY POPULATION AND METHODS

TOP ABSTRACT STUDY POPULATION AND METHODS RESULTS DISCUSSION REFERENCES

 
The study was a double blind, randomised, placebo controlled trial using a parallel group design. Written parental informed consent was obtained from each participating family and the study protocol was approved by the Ethical Committee of the Macedonio Melloni Maternity Hospital, Milan, Italy. Term infants born between 1 April 2003 and 31 March 2005 at the Macedonio Melloni Maternity Hospital, Milan and with a parental history of atopic eczema, allergic rhinitis, or asthma in either mother or father were eligible for the study. In all cases the parental diagnosis was based on a documented physician’s certification.

According to the hospital’s policy, breast feeding was recommended to all mothers.

The parents were informed about the study at discharge from the maternity unit and were asked to contact the hospital if they started formula feeding. Inclusion criteria were: gestational age between 37 and 42 weeks, birth weight appropriate for gestational age, and start of formula feeding within the first two weeks of life. When the mother contacted the hospital, the infants were randomly assigned to one of two formula feeds. The recipe of both formulae was based on a hypoallergenic formula with extensively hydrolysed cows’ milk whey protein and was supplemented either with 0.8 g GOS/FOS per 100 ml or a 0.8 g maltodextrin/100 ml as placebo. Randomisation was by means of a random numbers table and blinding was maintained by coding the two trial formulae with the suffix "N" or "O" to the product name.

The study formulae were fed ad libitum.

Mixed breast and bottle feeding was accepted until the sixth week of life. When the mother started formula feeding according to the inclusion criteria but continued breast feeding for more than six weeks, the infant was excluded from the study.

Study infants were seen on a monthly basis. The parents were interviewed with the aid of a diary. The results obtained before starting test formula feeding (examination day 1) and at the age of 3 and 6 months (examination days 2 and 3, respectively) were used for this analysis.

At each visit the infant’s skin was examined for AD according to the diagnostic criteria described by Harrigan and Rabinowitz¹⁷ and Muraro et al.¹⁸ The diagnosis of AD was confirmed if the following features were detected: pruritus, involvement of the face, skull facial and/or extensor part of the extremities, and a minimal duration of the symptoms of four weeks.

The severity of the skin alterations was scored by the SCORAD index based on extension, intensity of the skin symptoms, as well as on the subjective symptoms of pruritus and sleep loss as recommended by the European Task Force on AD.^19,20 The extent of AD was determined by using the SCORAD figure for infants under 2 years. Subjective symptoms and information concerning stool frequency and consistency were obtained during the interviews of the parents based on their diary record. All examinations and interviews were performed exclusively by two of the authors (GM and SA). Anthropometric measurements and recording of crying, regurgitation, vomiting, and stool characteristics were used as secondary parameters to describe safety as well as acceptance and tolerance. For all infants, growth parameters were measured at each study visit. Body weight was measured using a scale with an accuracy of ±5 g. The crown–heel length was measured using a special board for newborn and infants with an accuracy of ±1 mm and the head circumference was measured using a metal tape with accuracy ±1 mm.

The incidence of crying (score 1–3: 1 = practically not crying; 2 = crying in connection with feeding; 3 = crying independently from the meals), regurgitation (score 1–3: 1 = 0; 2 = 1–2; 3 = >2 regurgitations per day), and vomiting (score 1–3: 1 = 0; 2 = 1; 3 = >1 vomiting episodes per day) was recorded on the basis of the parent’s interview.

Stool characteristics were recorded with respect to consistency (score 1–5: 1 = watery; 2 = soft; 3 = seedy; 4 = formed; 5 = hard) and frequency. Stool consistency was evaluated on the basis of the appearance of the fresh sample used for the analysis, the questionnaire, and the report of the parents during the interview. The consistency of each stool sample was recorded on the day before the study day; the mean of the scores obtained was used to characterise the stool consistency of that day.

In a subgroup of 98 infants, the parents agreed to collect stool samples for microbiological analysis. The stool samples were obtained at all three examination visits. A volume of 0.2 g of a fresh faecal sample was homogenised in a cryo-protective glycerol transport medium (glycerol 10 ml, oxoid 0.1 g, water to 100 ml) and immediately frozen at –80°C. The samples were transported on dry ice. For the identification of bifidobacteria and lactobacilli, commercially available selective media were used (bifidobacteria: Heipha No 20580e, Heidelberg, Germany; lactobacilli: modified Rogosaagar Heipha 2068e, Heidelberg, Germany) as described previously.²¹ The numbers are presented as colony forming units (CFU)/g stool.

Statistics
The results were analysed on a per protocol basis.

Time balanced randomisation was performed with the software RANCODE (IDV Gauting, Germany; seed numbers randomised by reaction time) with a random permuted block size of four. Interval data (e.g. anthropometrics) were compared between the groups by two sided t test. Bacterial counts in the stool samples were compared by Mann-Whitney U test due to non-parametric data distribution.

Scores with ordinal data (e.g. stool consistency) were compared between the groups by Mann-Whitney U test.

Scores with nominal data (e.g. crying, vomiting, regurgitation) and other nominal data were compared by table analysis of the coded raw data (² test). In the case of 2x2 tables, Fisher’s exact test was used.

For analyses of the primary outcomes, 95% confidence intervals were calculated using the Wilson score method.²²

Sample size was calculated based on analysis of the previous years’ incidence of AD in the hospital and assuming an effect size similar to that reported for probiotics¹⁶ at that time. Based on this assumption, 108 subjects per group completing the protocol were calculated to provide a power of 80%. The study was completed after a full two year enrolment period to exclude seasonal effects. The drop out rate was slightly higher than assumed (20% versus 15%). Thus, the statistical analysis was performed on the basis of 206 instead of 216 completed cases as planned. A p value <0.05 was considered to be statistically significant.

	RESULTS

TOP ABSTRACT STUDY POPULATION AND METHODS RESULTS DISCUSSION REFERENCES

 
A total of 259 infants were enrolled in the study (fig 1). The most relevant clinical data of the study population are summarised in table 1. Fifty three infants left the trial before completing the study. The main reason for drop out was the continuation or reestablishment of breast feeding. The characteristics at birth and the reasons for drop out were not significantly different between the two groups (table 2).

View larger version (13K): [in this window] [in a new window]   Figure 1  Disposition of all subjects enrolled in the study.

View larger version (8K): [in this window] [in a new window]   Figure 2  Cumulative incidence of AD at 6 months of age in the group fed a formula supplemented with GOS and FOS or maltodextrins as placebo. Data are expressed as mean (95% CI).

In the subgroup of infants with a complete set of stool samples, supplementation with GOS/FOS resulted in a significant increase in the number of bifidobacteria when compared with the placebo group. There was no significant influence on lactobacilli counts (table 3).

No adverse effects were observed during the entire study based on the diary record given by the parents and the results of the monthly examinations.

	DISCUSSION

TOP ABSTRACT STUDY POPULATION AND METHODS RESULTS DISCUSSION REFERENCES

 
In the present study, the cumulative incidence of AD during the first six months of life was significantly reduced by supplementation of a hypoallergenic formula (extensively hydrolysed cows’ milk whey protein) with 0.8 g GOS/FOS per 100 ml. To our knowledge this is the first report showing that prebiotic oligosaccharides can influence the incidence of AD.

The majority of the infants investigated in this study had a maternal history of atopy which is strongly related to the risk of AD at 6 months of life.²³ It is well known that the incidence of AD peaks at 6 months,²⁴ but the reported absolute incidence varies substantially between different studies. However, the incidence in infants with comparable risk as in the present study is reported to be approximately 30%.^23,25

In the present study, a hydrolysed whey protein was used as the basis for both study formulae in accord with recent recommendations for the nutritional management of infants at risk,²⁶ which might explain the fact that only mild forms of AD occurred.²⁷

The primary hypothesis of this study was that dietary prebiotics could modulate the postnatal development of the immune system by altering intestinal flora. Although it was not possible to obtain stool samples from all infants, data from the subgroup providing stool samples showed a significant effect of GOS/FOS supplementation on the bifidobacteria counts, similar to a study previously performed in the same hospital¹⁰ using identical microbiological methods.²¹ As in the previous studies, the effect of GOS/FOS supplementation on lactobacilli counts was less pronounced. However, in studies using molecular techniques for microbial identification, the effect of GOS/FOS on lactobacilli counts has also been clearly shown.²⁸

There is accumulating evidence that human milk oligosaccharides (HMOS) can influence the immune system not only via the intestinal flora but also by direct interaction with immune cells. HMOS have been shown to affect the cytokine production and activation of human cord blood derived T cells in vitro.²⁹ Furthermore, HMOS can affect the formation of platelet–neutrophil complexes and activation of associated neutrophils in blood of healthy volunteers. Formation of these complexes requires selectins and could be influenced by HMOS.³⁰ Thus, HMOS could serve as anti-inflammatory components of human milk and contribute to the lower incidence of inflammatory diseases such as necrotising enterocolitis in breast fed versus formula fed infants.³¹

Recently, some effects of dietary carbohydrates such as fructans (inulin and oligofructose) on immune modulation were also investigated. In animal studies, the first evidence of immune modulation was shown primarily on activated immune cells in Peyer’s patches, including IL-10 production and natural killer cell cytotoxicity, the concentration of secretory IgA in ileum and caecum, and splenocyte cytokine production. It was speculated that part of the observed effects could be due to interaction of prebiotics with carbohydrate receptors on immune cells.³² In a murine type I allergy model, the allergic reaction following sensitisation with ovalbumin was attenuated in animals fed with dietary short chain galacto- and long chain fructo-oligosaccharides.³³

Misikangas et al³⁴ described an association with dietary inulin and adenoma growth in a mouse model with multiple intestinal neoplasia. In contrast to this single observation, Pool-Zobel in a review of 12 studies (animal and human studies) concluded that inulin-type fructans reduce the risk of colon cancer.³⁵ The Scientific Committee on Nutrition considered the studied GOS/FOS mixture as safe for infant nutrition up to a concentration of 0.8 g/100 ml.³⁶

The results of the present study do not allow conclusions concerning the mechanism of the effect that was observed on AD. The complexity of the structures of HMOS indicates that breast feeding is providing further support besides stimulation of the intestinal flora. In comparison, the studied prebiotic mixture is mainly active via its influence on intestinal flora. In summary, the present data show a significant effect of a dietary mixture of GOS/FOS on the incidence of AD at 6 months of age. Although further studies are needed to understand completely the mechanism behind the immune modulating effect of the studied prebiotics, the data support the potential role of prebiotics as dietary manipulation for primary allergy prevention during infancy.

What is already known on this topic The intestinal flora plays an important role in postnatal development of the immune system Dietary prebiotics (mixture of galacto-oligosaccharides and long-chain fructo-oligosaccharides) stimulate an intestinal flora dominated by bifidobacteria

 

What this study adds The studied prebiotic mixture reduces the incidence of AD in infants at risk, which proves the concept of the immune modulating capacity of prebiotics

 

	ACKNOWLEDGEMENTS

	FOOTNOTES

 
Published Online First 27 July 2006

Funding: the study was partially supported by a grant from Numico Research Friedrichsdorf, Germany and the EARNEST program (Food-CT-00678)

Competing interests: none declared

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TOP ABSTRACT STUDY POPULATION AND METHODS RESULTS DISCUSSION REFERENCES

 

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