Allergy and Immune Defence: Common IgE-dependent Mechanisms or Divergent Pathways

Càpron, André; Dessaint, Jean-Paul; Capron, Moníque; Moqbel, Redwan

doi:10.1007/978-1-349-12673-6_1

Cited by 1 publication

(1 citation statement)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dichotomy in the IgE antibody function demonstrated in this study agrees with the proposed ontological origin of IgE, being involved not only in protective mechanisms against parasitic infections but also as a potent effector mechanism in allergic diseases (4). Analysis of the immune response to B. malayi ␥-GT in longitudinal studies from areas with different endemicity may give insights into the regulation of the IgE and IgG4 responses in infected populations and may therefore elucidate mechanisms of both disease and protective immunity in lymphatic filarial infection of humans.…”

Section: Discussionsupporting

confidence: 88%

Elevated Immunoglobulin E against RecombinantBrugia malayiγ-Glutamyl Transpeptidase in Patients with Bancroftian Filariasis: Association with Tropical Pulmonary Eosinophilia or Putative Immunity

Lobos¹,

Nutman

Hothersall³

et al. 2003

Infect Immun

View full text Add to dashboard Cite

A major allergen of the lymphatic filarial nematode Brugia malayi, a homologue of ␥-glutamyl transpeptidase (␥-GT), is involved in the pathology of tropical pulmonary eosinophilia (TPE) through its potent allergenicity and the induction of antibodies against the host pulmonary epithelium. To investigate the immunoglobulin G (IgG) subclass and IgE responses to recombinant B. malayi ␥-GT, we analyzed the results obtained from 51 patients with differing clinical manifestations of bancroftian filariasis. ␥-GT-specific IgG1, rather than IgG4, was the predominant IgG subclass, particularly in patients with TPE (geomean, 6,321 ng/ml; range, 78 to 354,867 ng/ml) and was 75 times higher than in patients with elephantiasis (CP) (P < 0.003) and 185 times higher than in endemic normal individuals (ENL) (P < 0.010). IgG2 responses were low and IgG3 was almost absent, with no significant differences among the groups. ␥-GT-specific IgG4 responses were significantly elevated in those with subclinical microfilaremia (MF) compared to the CP and ENL groups and correlated with the presence of circulating filarial antigen (CAg). More significantly, ␥-GT-specific IgE antibody levels were strikingly elevated in patients with TPE (geomean, 681 ng/ml; range, 61 to 23,841 ng/ml) and in the ENL group (geomean, 106 ng/ml; range, 13 to 1,405 ng/ml) whereas the ␥-GT-specific IgE level was 44 and 61 times lower in those with MF and CP, respectively (P < 0.001). Elevated ␥-GT-specific IgE/IgG4 ratios were demonstrated in patients with TPE (ratio, 45) and ENL (ratio, 107). Because expression of ␥-GT in Brugia infective third-stage larvae (L3) was demonstrated by immunoblot analysis, the elevated ␥-GT-specific IgE antibodies appear to be associated not only with pulmonary pathology but also with possible resistance to infection in lymphatic filariasis.A common feature between atopic diseases and human infection with the lymphatic filarial nematodes Wuchereria bancrofti, Brugia malayi, or Brugia timori is the potent elevation of total and specific immunoglobulin E (IgE) and IgG4 antibody responses (18,20,26,40). While the involvement of allergenspecific IgE in the pathophysiology of bronchial asthma and atopic diseases is clearly documented (2), the role of parasitespecific IgE in helminth diseases is under debate. Evidence from animal models (5) and from longitudinal epidemiological studies of patients infected with Schistosoma spp. has linked parasite-specific IgE to resistance to reinfection and has associated parasite-specific IgG4 antibodies with increased susceptibility (9, 10, 15, 46). However, the potent effector function of IgE antibodies occurring through interaction with specific surface receptors (Fcε receptors I and II) present on a wide variety of inflammatory cells can result in inflammatory reactions associated with pathologic changes (3). Although high levels of total and parasite-specific IgE are common in patients with helmintic infections, manifestations of clinical allergy are less common. The presence of elevated concentrati...

show abstract

Section: Discussionsupporting

confidence: 88%