title: Maternal and postnatal dietary probiotic supplementation enhances splenic regulatory T helper cell population and reduces ovalbumin allergen-induced hypersensitivity responses in mice.
abstract: Neonatal to early childhood is the critical period for establishing a balance of T helper 1 (Th1) versus T helper 2 (Th2) cellular immunity within the gut, which is strongly influenced by the source and establishment of gut microflora. Probiotic administration has been shown to attenuate Th2-biased cellular immunity and predisposition to food allergies. To test this hypothesis we provided ad libitum a probiotic-supplemented (Primalac 454 Feed Grade Microbials) or control diet to lactating dams with suckling pups and weaned pups until 10 weeks of age. Weaned mice were sensitized/challenged with egg allergen ovalbumin, saline or adjuvant at 6, 8 and 10 weeks of age. At 3, 6, 8 and 10 weeks, fecal samples were collected for microbial analysis, while blood samples were analyzed for ovalbumin-IgE and total plasma IgE levels. At termination, splenic T helper cell lymphocyte population subtypes were determined using FACS analysis and Th1/Th2/Th17 gene expression by PCR array. At 21 days of age, pups suckled by lactating dams fed the probiotic supplemented diet had significantly enhanced Lactobacillus acidophilus fecal counts compared to controls. Moreover, mice fed the probiotic supplemented diet had enhanced splenic naturally occurring and induced regulatory T cell populations, enhanced TGFβ gene expression and reduced expression of allergic mediator IL13 compared to controls. These results provide evidence that early probiotic supplementation may provide host protection from hypersensitivity reactions to food allergens by attenuating food allergen inflammatory responses.
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States. Electronic address: Ondulla.Toomer@fda.hhs.gov.
authors.forename: Ondulla T
authors.initials: OT
authors.lastname: Toomer
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Martine
authors.initials: M
authors.lastname: Ferguson
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Marion
authors.initials: M
authors.lastname: Pereira
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Andrew
authors.initials: A
authors.lastname: Do
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Elmer
authors.initials: E
authors.lastname: Bigley
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Dennis
authors.initials: D
authors.lastname: Gaines
authors.affiliation: U.S. Food and Drug Administration, Laurel, MD 20708, United States.
authors.forename: Kristina
authors.initials: K
authors.lastname: Williams
mesh_terms: D000485:Allergens / Q000276:immunology*; D000818:Animals; D000831:Animals, Newborn; D000918:Antibody Specificity / Q000276:immunology; D001835:Body Weight; D019587:Dietary Supplements; D004195:Disease Models, Animal; D005260:Female; D005512:Food Hypersensitivity / Q000235:genetics / Q000276:immunology* / Q000517:prevention & control; D041981:Gastrointestinal Tract / Q000276:immunology / Q000382:microbiology; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology; D007779:Lactobacillus acidophilus; D018811:Maternal Exposure; D051379:Mice; D010047:Ovalbumin / Q000276:immunology*; D019936:Probiotics / Q000008:administration & dosage*; D013154:Spleen / Q000276:immunology* / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology* / Q000378:metabolism
chemical_list: D000485:Allergens; D007073:Immunoglobulin E; D010047:Ovalbumin
keywords: Food allergy; Mouse; Ovalbumin; Probiotics