The potential mechanistic link between allergy and obesity development and infant formula feeding

Allergy, Asthma & Clinical Immunology

Bodo C Melnik¹ 

[1] Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Sedanstrasse 115, DE-49090 Osnabrück, Germany

关键词: Regulatory T-cell;    Postnatal growth acceleration;    Obesity;    mTORC1;    Infant formula;    FoxP3;    Breastfeeding;    Allergy;   

Others  :  1082141
DOI  :  10.1186/1710-1492-10-37

 received in 2014-05-19, accepted in 2014-07-15,  发布年份 2014

【 摘 要 】

This article provides a new view of the cellular mechanisms that have been proposed to explain the links between infant formula feeding and the development of atopy and obesity. Epidemiological evidence points to an allergy- and obesity-preventive effect of breastfeeding. Both allergy and obesity development have been traced back to accelerated growth early in life. The nutrient-sensitive kinase mTORC1 is the master regulator of cell growth, which is predominantly activated by amino acids. In contrast to breastfeeding, artificial infant formula feeding bears the risk of uncontrolled excessive protein intake overactivating the infant’s mTORC1 signalling pathways. Overactivated mTORC1 enhances S6K1-mediated adipocyte differentiation, but negatively regulates growth and differentiation of FoxP3⁺ regulatory T-cells (Tregs), which are deficient in atopic individuals. Thus, the “early protein hypothesis” not only explains increased mTORC1-mediated infant growth but also the development of mTORC1-driven diseases such as allergy and obesity due to a postnatal deviation from the appropriate axis of mTORC1-driven metabolic and immunologic programming. Remarkably, intake of fresh unpasteurized cow’s milk exhibits an allergy-preventive effect in farm children associated with increased FoxP3⁺ Treg numbers. In contrast to unprocessed cow’s milk, formula lacks bioactive immune-regulatory microRNAs, such as microRNA-155, which plays a major role in FoxP3 expression. Uncontrolled excessive protein supply by formula feeding associated with the absence of bioactive microRNAs and bifidobacteria in formula apparently in a synergistic way result in insufficient Treg maturation. Treg deficiency allows Th2-cell differentiation promoting the development of allergic diseases. Formula-induced mTORC1 overactivation is thus the critical mechanism that explains accelerated postnatal growth, allergy and obesity development on one aberrant pathway.

【 授权许可】

   
2014 Melnik; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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