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Metabolism of Immunoglobulin E in Patients with Markedly Elevated Serum Immunoglobulin E Levels

Overview
Journal J Clin Invest
Specialty General Medicine
Date 1987 Jun 1
PMID 3584468
Citations 19
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Abstract

The metabolism of human IgE was studied in normals, severe atopics, and patients with the hyperimmunoglobulin E-recurrent infection (HIE; Job's) syndrome to determine whether IgE metabolism is altered in patients with marked elevation of serum IgE. Purified polyclonal 125I-IgE was administered intravenously and serial plasma and urine samples were obtained. After analysis, the metabolic data support previously published evidence that IgE (at concentrations found in normal individuals) is catabolized at a higher fractional rate than other immunoglobulins and is catabolized by both an intravascular and an extravascular pathway. In addition, the data show that the fractional catabolic rate for IgE is significantly less for the atopic patients (mean +/- SEM = 0.20 +/- 0.01) and for the HIE patients (0.15 +/- 0.02) than for the normal volunteers (0.52 +/- 0.06; P less than 0.01) and is inversely related (r = -0.851; P less than 0.001) to the serum IgE concentration. These findings have specific importance in showing that decreased fractional catabolic rate contributes substantially to elevation of IgE in atopic and HIE patients. In addition, the findings have general significance in that they lead to a unifying hypothesis of immunoglobulin catabolism.

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