Hu antigens: reactivity with Hu antibodies, tumor expression, and major immunogenic sites

Annals of Neurology
G T ManleyJ B Posner

Abstract

HuD, a human neuronal RNA-binding protein, was the first identified member of a family of antigens that also includes HuC and Hel-N1 (Hu antigens). The serum of all patients with anti-Hu-associated paraneoplastic encephalomyelitis and sensory neuronopathy react with HuD and Hel-N1, but the reactivity with HuC is unknown. In the current study we examined (1) the reactivity of anti-Hu sera with HuD, HuC, and Hel-N1; (2) the expression of HuD, HuC, and Hel-N1 messenger RNA in small-cell lung cancer of patients with and those without paraneoplastic encephalomyelitis/sensory neuronopathy; (3) the correlation between anti-Hu serum reactivity with these three Hu antigens and the type of neurological symptoms; and (4) the major immunogenic sites of HuD. Our findings indicate that all anti-Hu sera react with HuD, HuC, and Hel-N1. However, only HuD is expressed in the small-cell lung cancer tumors, indicating that among the three Hu antigens, HuD appears to play a central role in triggering the anti-Hu immune response. No differences were identified regarding the reactivity of the anti-Hu antibodies with HuD, HuC, and Hel-N1 and the spectrum of neurological symptoms presented by the patients. Study of the major immunogenic sites of HuD r...Continue Reading

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