Antigen-induced immune suppression, like T cell activation, requires antigen-presenting cells (APCs); however, the role of APCs in mediating these opposing effects is not well understood, especially in vivo. We report that genetic inactivation of CD11b, which is a CD18 subfamily of integrin receptors that is highly expressed on APCs, abolishes orally induced peripheral immune tolerance (oral to...

OBJECTIVE HSP60-specific T cells contribute to the development of the immune responses in atherosclerosis. This can be dampened by regulatory T cells activated via oral tolerance induction, and we explored the effect of oral tolerance induction to HSP60 and the peptide HSP60 (253 to 268) on atherosclerosis. METHODS AND RESULTS HSP60 and HSP60 (253 to 268) were administered orally to LDLr(-/-)...

AIMS To determine optimal conditions for enhancing corneal allograft survival through oral administration of donor specific corneal cells. METHODS A mouse model of penetrating keratoplasty was used to evaluate the efficacy and optimal conditions for preventing immunological rejection of corneal allografts. C3H corneal grafts were transplanted orthotopically to CB6F1 recipients and represented...

To elucidate the role of CD4+CD25+ regulatory T cells in oral tolerance, we used the model of contact hypersensitivity (CHS) to 2,4-dinitrofluorobenzene (DNFB), which is mediated by CD8+ Tc1 effector cells independently of CD4+ T-cell help. Conversely to normal mice, invariant chain knock-out (KO) (Ii degrees / degrees ) mice, which are deficient in CD4+ T cells, cannot be orally tolerized and ...

OBJECTIVES To evaluate the applicability of the 50-g glucose challenge test as a screening test for gestational diabetes mellitus in relation to pregnancy outcomes. METHODS A prospective study was conducted on 818 Saudi pregnant females who were randomly recruited from the Antenatal Clinics at King Abdulaziz University Hospital and New Jeddah Clinic Hospital, Jeddah. All females underwent a 5...

Food allergy represents failure to develop tolerance to dietary proteins. Food allergy has increased in prevalence in parallel with decreased exposure to microbes during infancy. In mice, neonatal peroral exposure to the strongly T cell stimulating superantigen staphylococcal enterotoxin A (SEA), enhances the capacity to develop oral tolerance to a novel antigen encountered in adult life. A pop...

Oral administration of large doses of protein antigen generally induces a state of systemic unresponsiveness currently termed mucosally induced tolerance. In this study, we used human milk protein (HMP) without casein as a multi-protein antigen for the study of mucosally induced tolerance. The HMP utilized in this study mainly contained secretory (S) IgA, lactoferrin (Lf) and alpha-lactalbumin ...

Food allergy results from failure in oral tolerance that usually occurs in infancy or early childhood. Exposure to peanut and hen's egg via the inflamed and disrupted epithelial barrier in children with severe atopic dermatitis is a risk factor for the development of allergy to these foods and supports the hypothesis that epicutaneous exposure in the absence of oral feeding is an important path...

We investigated the effects of the aqueous extract of Epimedii Herba (AEEH) on the induction of oral tolerance. Oral tolerance was induced in mice by giving an oral administration of 20 mg ovalbumin (OVA) 7 d before immunization with the antigen. AEEH at 40 mg/kg was given orally daily for 6 d from 24 h after the feeding of OVA. The results showed that oral administration of OVA greatly suppres...

BACKGROUND Pregnant women commonly receive screening for gestational diabetes mellitus by use of a 50 g glucose challenge test, followed by a diagnostic oral glucose tolerance test for those whose glucose challenge test result is abnormal. Although women with gestational diabetes have an increased risk of cardiovascular disease, it is not known whether mild glucose intolerance during pregnancy ...