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Detection of Anti-Phospholipid and Anti-DNA Antibodies and their Idiotypes in Newborns of Mothers with Anti-Phospholipid Syndrome and SLE

Department of Medicine 'B', Sheba Medical Center, Tel-Hashomer and the Sackler Faculty of Medicine, Tel-Aviv University, Israel

R. Bakimer

Department of Medicine 'B', Sheba Medical Center, Tel-Hashomer and the Sackler Faculty of Medicine, Tel-Aviv University, Israel

A. Tincani

Department of Clinical Immunology, Brescia, Italy

D. Faden

Department of Clinical Immunology, Brescia, Italy

J. Cohen

Department of Medicine 'B', Sheba Medical Center, Tel-Hashomer and the Sackler Faculty of Medicine, Tel-Aviv University, Israel

M. Lorber

department of Rheumatology, Rambam Medical Center, Haifa, Israel

G. Valesini

Clinical Immunology, University of Rome, Rome, Italy

Y. Shoenfeld

Department of Medicine 'B', Sheba Medical Center, Tel-Hashomer and the Sackler Faculty of Medicine, Tel-Aviv University, Israel

The titers, isotypes and idiotypes of antiphospholipid and anti-dsDNA antibodies were determined in seven pairs of mothers with antiphospholipid syndrome (APLS) and their offspring, in I 1 pairs of SLE mothers and their matched infants and in seven respective pairs of healthy subjects. In addition, maternal as well as fetal sera were evaluated for the presence of anti-SSA (Ro), anti-SSB (La) and anti-70 kd RNP autoantibodies.

In the sera from APLS patients, as well as in the sera from their offspring, the mean antibody titer of IgG aCL was found to be significantly higher then the corresponding value in the control group (P < 0.01). Highly significant increased titers of IgG anti-DNA antibodies were found in the sera of SLE mothers and their matched offspring (P < 0.0008).

The prevalance of anti-SSA, anti-SSA, and anti-7OK RNP antibodies was lower then that of antiphospholipid and anti-dsDNA antibodies. Only one of the respective offspring had increased levels of these antibodies.

The quantity of maternal antibodies transferd to the fetus was depended on their concentration in the maternal circulation, as well as on their type and specificity. Follow-up of newborn sera showed a progressive decrease in the antiphospholipid antibody titers during 3 months. After 6 months it was undetected.

Our results point to a transplacental transfer of aCL and anti-DNA antibodies, a phenomenon which is not necessarily associated with respective clinical manifestations, in contrast to the classical humoral mediated autoimmune diseases (e.g. myasthenia gravis).

Key Words: Anti-DNA antibodies • Anti-cardiolipin • Anti-phospholipid syndrome • Lupus • Idiotypes • Autoimmunity • Autoantibodies

Lupus, Vol. 2, No. 4, 233-237 (1993)
DOI: 10.1177/096120339300200405


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