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More MS news articles for June 2003

Dynamics of immune cell trafficking in interferon-beta treated multiple sclerosis patients

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12799025&dopt=Abstract

J Neuroimmunol. 2003 Jun;139(1-2):84-92
Hartrich L, Weinstock-Guttman B, Hall D, Badgett D, Baier M, Patrick K, Feichter J, Hong J, Ramanathan M.
Department of Pathology, State University of New York at Buffalo, 14260-1200, Buffalo, NY, USA

PURPOSE:

To investigate the effects of interferon-beta-1a (IFN-beta-1a) on the trafficking of cell populations in peripheral blood cells of multiple sclerosis (MS) patients.

METHODS:

In this open-label pharmacodynamic study, peripheral blood was obtained from 10 relapsing-remitting (RR) MS patients just prior to and at 1, 2, 4, 8, 24, 48, 120, and 168 h after intramuscular injection of 30-&mgr;g IFN-beta-1a.

Timed samples were also obtained from five controls at 0, 8, 24, 48 and 168 h.

The blood cells were analyzed using four-color flow cytometry with antibody conjugates directed against cell surface proteins specific for T cells, B cells, NK cells, and the activation marker, CD69.

RESULTS:

IFN-beta-1a treatment resulted in selective, time-dependent effects on many cell populations in peripheral blood.

The trafficking of T-helper and T-suppressor/cytotoxic subsets of T cells were qualitatively different.

The most prominent effects were on the trafficking of natural killer cells, the levels of which decreased to 23.5% of pretreatment values at 8 h after treatment.

The levels of CD69-positive NK cells increased to a peak value of 606% of pretreatment levels at the 24-h time point.

In untreated controls, these characteristic trafficking effects were not observed.

There was inter-patient heterogeneity in the levels of activated NK cells at the 6-month time point that may potentially be relevant for individualizing IFN-beta therapy.

CONCLUSIONS:

IFN-beta treatment can induce specific, selective, and time-dependent trafficking of cells and its effects on different subsets of a given cell type are not qualitatively similar.

The dynamics indicate that the activation of NK cells by IFN-beta is possibly dependent on the trafficking of NK cells.

The activated NK cell levels after prolonged therapy may potentially provide a surrogate marker for IFN-beta exposure.