Epigenetic Effects Elicited By Lactobacillus GG In Children With Cow's Milk Allergy
Lactobacillus GG (LGG) is able to exert long lasting effects in children with atopic disorders. We have shown that Nutramigen LGG accelerates tolerance acquisition in infants with cow's milk allergy (CMA). The mechanisms of these effects are still largely undefined. The effect of LGG could be related at least in part by the immunoregulatory role played by LGG. This probiotic can balance the generation of cytokines possibly involved in IgE- or non-IgE-mediated CMA (i.e., IL-4, IL-5, IL-10, IFN-γ , TGF-beta, and TNF-alfa), which can contribute to modulation of inﬂammatory processes. We have demonstrated that children with IgE-mediated CMA produce significantly higher level of IL-4 and IL-13 in response to cow's milk protein, and that tolerance is associated with a marked reduction of IL-13 production and a concomitant increased frequency of IFN-γ releasing cells.
Epigenetics studies the heritable (and potentially reversible) changes of the genome inherited from one cell generation to the next which alter gene expression but do not involve changes in primary DNA sequences, highlighting the complexity of the inter-relationship between genetics and nutrition. There are three distinct, but closely interacting, epigenetic mechanisms (histone acetylation, DNA methylation, and non-coding microRNAs) that are responsible for modifying the expression of critical genes associated with physiologic and pathologic processes. The profile of epigenetic modifications associated with Th lineage commitment, coupled with the sensitivity of the early developmental period, has led to speculation that factors that disrupt these pathways may increase the risk of allergic diseases. Specifically, effects on DNA methylation and endogenous histone deacetylase inhibitors acting on specific pathways (Th1 and T regulatory cell differentiation) may favour Th2-associated allergic differentiation. MicroRNAs are another structural components of an epigenetic mechanism of post-transcriptional regulation of messenger RNA translation. It has been recently identified a specific Th2-associated miRNA (miR-21) that is critical for the regulation of Th cell polarization.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||EPIGENETIC EFFECTS ELICITED BY LACTOBACILLUS GG IN CHILDREN WITH COW'S MILK ALLERGY: A POSSIBLE EFFECT OF ATOPIC MARCH|
- Change from baseline to 6 months in tolerance acquisition and epigenetic effects in rtwenty children with cow's milk allergy [ Time Frame: Baseline, at least after 6 months of therapy ] [ Designated as safety issue: No ]The investigators will evaluate in children with CMA if the effect of Lactobacillus GG on tolerance acquisition is mediated at least in part by an epigenetic mechanism.
|Study Start Date:||July 2013|
|Estimated Primary Completion Date:||August 2014 (Final data collection date for primary outcome measure)|
Experimental: Treatment with Lactobacillus GG
extensively hydrolyzed casein formula containing LGG
|Dietary Supplement: Lactobacillus GG|
|No Intervention: Children at diagnosis|
Please refer to this study by its ClinicalTrials.gov identifier: NCT02062476
|Contact: Roberto Berni Canani, MD, PhD||0817462680|
|University of Naples Federico II||Recruiting|
|Naples, Italy, 80131|
|Contact: Roberto Berni Canani 0817462680|