Pharmacodynamics of interferon beta in multiple sclerosis patients with or without serum neutralizing antibodies.

Abstract:

:To analyze the in vivo biological effect of anti-interferon beta (IFN-beta) neutralizing antibodies (NABs), blood concentrations of neopterin, beta2microglobulin (Beta2-MG), mRNA-dependent myxovirusresistant protein A (MxA) and dsRNA-dependent protein kinase (PKR) were measured before (predose) and 24 hours after (postdose) IFN-beta administration in 49 patients with multiple sclerosis (MS) with (n = 25) and without (n = 24) NABs. The results indicated that predose levels of MxA-mRNA and PKR-mRNA were highly variable [coefficient of variation (CV) > 100%] among patients. A lower inter-individual variability was observed for pre-dose levels of Beta2-MG and neopterin (CVs of 29% and 44%, respectively). Significantly lower pre- and post-dose blood levels of IFN induced markers, except for postdose PKR-mRNA (p = 0.09), were seen in NAB+ compared with NAB-patients and between patients with high (> 200 t(1/10)) and low ( pound 200 t(1/10)) NAB titers. A significant inverse correlation between NAB titer and pre-dose levels of the above IFN-induced markers was found. In summary, our findings confirm that NABs affect absolute concentrations of IFN-beta induced markers and suggest that such an effect occurs in a titer-dependent manner.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Scagnolari C,Duda P,Bagnato F,De Vito G,Alberelli A,Lavolpe V,Girardi E,Durastanti V,Trojano M,Kappos L,Antonelli G

doi

10.1007/s00415-006-0332-7

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

597-604

issue

5

eissn

0340-5354

issn

1432-1459

journal_volume

254

pub_type

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