Recurrent pregnancy loss is associated with the presence of autoantibodies against phospholipid (PL) antigens in some patients. Mechanisms underlying the development of such autoimmune pregnancy loss are not well understood. Recent reports have suggested existence of T cells that recognize PL antigens bound to an antigen presenting molecule, CD1d. My hypothesis is that such CD1d-restricted PL-reactive T cells induce the production of anti-PL autoantibodies and pregnancy loss associated with these antibodies. In support of this hypothesis, we have found that CD1d-knockout autoimmune-prone (NZB X NZW) F1 mice have significantly reduced serum levels of anti-PL antibodies as compared to their wild-type littermates, suggesting a possible role of CD1d in the development of anti-PL antibodies. Building on my expertise in the biology of CD1d-restricted glycolipid-reactive T cells and based on the above observations, I will test this hypothesis in three Specific Aims.
In Aim 1, I'll test the hypotheses that mice with spontaneous or induced anti-PL antibodies have increased numbers and/or activation of PL-reactive T cells in lymphoid organs;such T cells will infiltrate the pregnant uterine mucosa, called decidua, in increased numbers. Then, I'll determine the effect of CD1d-restricted PL-reactive T cells on the production of anti-PL antibodies by B cells in vitro in Aim 2.
In Aim 3, I'll determine the effect of CD1d-restricted PL-reactive T cells on pregnancy outcome. We will further investigate whether PL-reactive T cells directly induce pregnancy loss or whether pregnancy loss is mediated via anti-PL antibodies induced by PL-reactive T cells. It is hoped that this study will elucidate a novel pathogenetic mechanism of recurrent pregnancy loss in autoimmune diseases. The data obtained will also form the basis for my first R01 or another extramural proposal.

Public Health Relevance

Pregnancy loss is a major unsolved complication of many autoimmune diseases. The proposed studies will investigate a new mechanism of pathogenesis of autoimmune-mediated pregnancy loss and improve our understanding of the role of certain T cells in the development of autoimmune pregnancy loss.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Small Research Grants (R03)
Project #
5R03HD067413-02
Application #
8331345
Study Section
Pediatrics Subcommittee (CHHD)
Program Officer
Yoshinaga, Koji
Project Start
2011-09-14
Project End
2013-08-31
Budget Start
2012-09-01
Budget End
2013-08-31
Support Year
2
Fiscal Year
2012
Total Cost
$77,000
Indirect Cost
$27,000
Name
University of California Los Angeles
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095