Human decidua-associated protein 200 neutralizes the detrimental effect of serum containing antiphospholipid antibodies on fetal survival in the rat.
OBJECTIVE
We wanted to examine whether the detrimental effect of serum containing antiphospholipid (APL) antibodies on rat pregnancy outcome can be neutralized by addition of human decidua-associated protein (hDP) 200, a kind of rheumatoid factor, extracted from decidual tissue.


METHODS
Fifty microliters of pooled serum, obtained from women having anticardiolipin antibody and lupus anticoagulant and presenting with APL antibody syndrome, added with 100 microL of immunoaffinity purified hDP200 was injected into unilateral uterine horn of each rat on day L5 of rat pregnancy. The contralateral uterine horn was used for injection of 50 microL APL positive serum added with physiologic saline as a control. The rats were killed on day L14, and the uterus of each rat was inspected for the presence of live and resorbed fetuses.


RESULTS
The addition of hDP200 to APL positive serum before the intrauterine injection neutralized the detrimental effect of APL serum on fetal resorption rate. Although the neutralizing effect was demonstrated following the addition of hDP200 and immediate intrauterine injection (a decrease in fetal resorption rate, P = 0.004), still the effect was more impressive following the addition of hDP200 and incubation period of 24 hr before the injection, thus causing a significant increase in the number of normal embryos and a significant decrease in fetal resorption rate (P < 0.001).


CONCLUSIONS
Human decidua-associated protein 200, extracted from human decidual tissue neutralizes the detrimental effect of serum containing APL antibodies in an experimental rat model. Further studies are needed to prove this finding.
Department of Obstetrics and Gynecology, Assaf Harofeh Medical Center, Zerifin, affiliated with Sackler School of Medicine, Tel-Aviv University, Israel. ruvith@asaf.health.gov.il
Reuvit
R
Halperin
Nili
N
Shinnar
Noga
N
Kronfeld-Schor
Eran
E
Hadas
D000818:Animals; D017152:Antibodies, Antiphospholipid / Q000378:metabolism* / Q000633:toxicity; D005260:Female; D005313:Fetal Death / Q000097:blood* / Q000276:immunology / Q000517:prevention & control*; D006801:Humans; D007136:Immunoglobulins / Q000494:pharmacology*; D011247:Pregnancy; D011256:Pregnancy Outcome; D011257:Pregnancy Proteins / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar
D017152:Antibodies, Antiphospholipid; D007136:Immunoglobulins; D011257:Pregnancy Proteins; C088113:decidua-associated protein 200