Serum C4 levels in patients with systemic lupus erythematosus in remission.

Abstract:

:Abstract Twenty-six patients with systemic lupus erythematosus (SLE) showing systemic lupus activity measure (SLAM) and SLE disease activity index (SLEDAI) scores ≤2, as well as a lower C4 concentration than the mean C4 levels of healthy controls, were selected to evaluate the C4 levels of SLE patients in remission. Serum complement (CH50), complement components (C4, C3, and B), complement split products (C4d, iC3b, and Bb), phenotypic expression of C4 allotype, C4 production by peripheral blood monocytes, peripheral blood lymphocyte subpopulation, and interferon-gamma (IFN-γ) production were examined. In patients with SLE in remission, the C4 consumption (C4d/C4) was found to increase, and this was considered to be the most important factor for determining the serum concentration of C4. However, the relevance of the C4 allotypic expression was minimal. The IFN-γ-stimulated production of C4 by peripheral blood monocytes in SLE patients in remission was also less than that of the healthy controls. The IFN-γ-stimulated production of C4 in SLE patients in remission correlated with the peripheral blood CD4-positive cells. Less IFN-γ was produced by lymphocytes of SLE in remission than by those of healthy adults. We conclude that the serum C4 levels in SLE patients in remission reflect the degree of C4 consumption as well as the disease state, rather than genetic influences such as a C4A defect.

journal_name

Mod Rheumatol

journal_title

Modern rheumatology

authors

Yasuda M,Suenaga Y,Nishimukai H,Nobunaga M

doi

10.3109/s101650200037

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

213-8

issue

3

eissn

1439-7595

issn

1439-7609

journal_volume

12

pub_type

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