Omalizumab decreased IgE-release and induced changes in cellular immunity in patients with allergic asthma.

Abstract:

BACKGROUND:Omalizumab, a recombinant monoclonal anti-immunoglobulin E (IgE) antibody, shows proven efficacy in the treatment of allergic diseases. A little is known about the immunological pathways affected by the decrease of circulating free IgE during omalizumab treatment. AIM OF THE STUDY:To investigate the immunological consequence of IgE withdrawal, we studied the influence of omalizumab on stimulated IgE-release of cultured peripheral blood mononuclear cells (PBMC) and on the relative number of lymphocytes in the peripheral blood (cellular immune status) in patients with allergic asthma. METHODS:Nineteen patients were enrolled and received omalizumab at a dose of at least 0.016 mg/kg/IgE (IU/ml) every 4 weeks. PBMC were isolated from peripheral blood. Cells were cultured and stimulated with IL-4 (5 ng/ml) and CD40 ligand (1 microg/ml) for 10 days. IgE release was detected in cell culture supernatants by enzyme-linked immunosorbent assay (ELISA). Cellular immune status was investigated by fluorescence-activated cell sorting. RESULTS:Omalizumab treatment induced significant inhibition of stimulated IgE release (median 1.38-0 ng/ml vs. 1.64-2.0 ng/ml in placebo group, P<0.05). B-lymphocyte counts were also significantly lower in the omalizumab group compared with placebo after 12 weeks of treatment (median 18.2-15.6% lymphocytes vs 12.7-13.7% lymphocytes after placebo, P<0.01). There were no significant differences in the other lymphocyte subpopulations between the groups. CONCLUSIONS:These findings provide evidence of immunological influences of omalizumab treatment, leading to a downregulation of IgE secretion and decrease of lymphocyte subpopulations (B-cells) indicating their anti-inflammatory potency.

journal_name

Allergy

journal_title

Allergy

authors

Hanf G,Brachmann I,Kleine-Tebbe J,Seybold J,Kunkel G,Suttorp N,Noga O

doi

10.1111/j.1398-9995.2006.01180.x

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

1141-4

issue

9

eissn

0105-4538

issn

1398-9995

pii

ALL1180

journal_volume

61

pub_type

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