Transmission in utero is an important source of pediatric HIV infections, and miscarriages occur at an elevated rate in HIV-infected women. The mechanism for transplacental transmission or perturbation of pregnancy by the virus is unknown. Placental immunomodulators are involved in the regulation of normal pregnancy. Successful pregnancy typically is biased toward a Th2-mediated immune response, and Th1 cytokine expression must by suppressed. Trophoblastic cells and decidual leukocytes express immunomodulators that regulate placental immunology. Trophoblasts can be infected with HIV. HIV expression is augmented by some immunomodulators that are expressed in the placenta, and HIV infections can alter the profile of trophoblastic cytokines. Thus, dysregulation of placental immunology probably occurs during HIV infections, possibly contributing to HIV vertical transfer and miscarriage. The FIV-infected cat serves is a model for HIV vertical infections, with vertical infection resulting in compromised pregnancy. Preliminary data indicate increased expression of placental Th1 cytokines in FIV-infected queens. The purpose of this project is to evaluate placental immunopathology at the cellular level, at early and late gestation, to begin to understand mechanistically how lentiviral transplacental transmission occurs and compromises pregnancy.
The specific aims of this project are to: 1) Determine whether FIV infection induces immunopathology in trophoblasts. The expression of representative Th1 and Th2 cytokines, the chemokine receptor CXCR4 (a receptor for FIV), its ligand SDF, and FIV in placental trophoblasts will be determined using laser capture microdissection (LCM) to capture trophoblasts, followed by TaqMan real time PCR to assess expression of the genes. 2) Determine whether FIV infection induces placental cytotoxicity. Decidual leukocyte populations will be quantified using immunohistochemistry, and cytokine profiles in these cells will be determined, following LCM and real time PCR. The effect of viral infection on apoptosis of trophoblasts will be examined using the TUNEL assay. Collectively, the data obtained from this study may identify placental immunological factors that result in FIV transplacental transmission and compromised pregnancy. The long-term goal of this project is to provide the intellectual basis for immune-based intervention strategies to minimize lentivirus-induced placental immunopathology and fetal damage. Using the FIV-infected cat to model transplacental HIV infection, we will evaluate placental immunology at the cellular level. The production of immunomodulators will be examined in infected and uninfected pregnant cats. We hope to identify immune parameters promoting in utero viral transmission and fetal damage. ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Academic Research Enhancement Awards (AREA) (R15)
Project #
2R15AI048419-02A1
Application #
7061442
Study Section
AIDS Immunology and Pathogenesis Study Section (AIP)
Program Officer
Embry, Alan C
Project Start
2000-07-01
Project End
2009-02-28
Budget Start
2006-03-01
Budget End
2009-02-28
Support Year
2
Fiscal Year
2006
Total Cost
$209,289
Indirect Cost
Name
Mississippi State University
Department
Biology
Type
Schools of Arts and Sciences
DUNS #
075461814
City
Mississippi State
State
MS
Country
United States
Zip Code
39762
Scott, Veronica L; Wallace, Kedra; Mays, Stephany et al. (2011) An immunohistochemical assay to detect trophoblasts in frozen feline placenta. J Vet Diagn Invest 23:275-81
Scott, Veronica L; Boudreaux, Crystal E; Lockett, Nikki N et al. (2011) Cytokine dysregulation in early- and late-term placentas from feline immunodeficiency virus (FIV)-infected cats. Am J Reprod Immunol 65:480-91
Scott, Veronica L; Shack, Leslie A; Eells, Jeffrey B et al. (2011) Immunomodulator expression in trophoblasts from the feline immunodeficiency virus (FIV)-infected cat. Virol J 8:336
Lockett, N N; Scott, V L; Boudreaux, C E et al. (2010) Expression of regulatory T cell (Treg) activation markers in endometrial tissues from early and late pregnancy in the feline immunodeficiency virus (FIV)-infected cat. Placenta 31:796-802
Coats, Karen S; Boudreaux, Crystal E; Clay, Brittany T et al. (2010) Placental immunopathology in the FIV-infected cat: a role for inflammation in compromised pregnancy? Vet Immunol Immunopathol 134:39-47
Boudreaux, Crystal E; Lockett, Nikki N; Chemerys, Daniellé N et al. (2009) Maternal hematological and virological characteristics during early feline immunodeficiency virus (FIV) infection of cats as predictors of fetal infection and reproductive outcome at early gestation. Vet Immunol Immunopathol 131:290-7
Scott, Veronica L; Burgess, Shane C; Shack, Leslie A et al. (2008) Expression of CD134 and CXCR4 mRNA in term placentas from FIV-infected and control cats. Vet Immunol Immunopathol 123:90-6
Coats, Karen S (2005) The feline immunodeficiency virus-infected cat: a model for lentivirus-induced placental immunopathology and reproductive failure (mini-review). Am J Reprod Immunol 54:169-85