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Abstract

Background

Although the concept that an initial course of immune-suppression facilitates subsequent immune-modulation (such as Th1 to Th2 deviation) is attractive for several autoimmune diseases, such a mechanism for serial-combination therapy has never been formally demonstrated. Recently, brief mitoxantrone induction-chemotherapy followed by immune-modulation with glatiramer acetate (GA) was significantly more effective at reducing multiple sclerosis disease activity than with GA alone.

Objective

To examine whether the benefit of initial immune suppression with mitoxantrone before GA treatment is associated with more efficient immune modulation.

Methods

IgG1/IgG4 GA-reactive antibody profiles, previously established as markers of GA-induced Th2 immune-deviation, were prospectively measured in vivo in patients treated with GA alone or with mitoxantrone induction therapy followed by GA.

Results

Significant and sustained increase in IgG4 antibodies (and the anticipated reversal of the IgG1/IgG4 ratio) was seen in patients treated with GA alone. Combination therapy resulted in lesser IgG4 induction (and no reversal of IgG1/IgG4 ratio). Thus, the enhanced efficacy of mitoxantrone–GA combination regimen was associated with decreased, rather than increased, efficiency of shifting the GA-reactive IgG1/IgG4 antibody profile.

Conclusion

These results provide important insights into mechanisms of combination therapy and therapeutic strategies for autoimmune diseases.

Keywords

B cells combination therapy GA-reactive antibodies glatiramer acetate IgG1-4 mitoxantrone multiple sclerosis Th2 immune-deviation

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Serial combination therapy: is immune modulation in multiple sclerosis enhanced by initial immune suppression?

Abstract

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