Introduction: Preeclampsia is a serious obstetrical syndrome characterized by hypertension, proteinuria, generalized edema and generalized vasospasm, which affects ~7% of pregnant women. Despite its recognition since antiquity, the current treatment of this disorder is not based on an understanding of its pathophysiology but remains empricial: delivery of the fetus and placenta. The high maternal and fetal morbidity and mortality associated with preeclampsia largely result from the iatrogenic preterm interruption of affected pregnancies. The cellular and molecular biology that underlies this syndrome only recently has begun to be elucidated. Abnormalities of trophoblast differentiation and invasion have been discovered by Dr. Fisher and colleagues. Studies in my laboratory have focused on mechanisms of maternal vascular endothelial dysfunction in preeclampsia, with an emphasis on the biochemical pathways involved in abnormal prostanoid production. Data from our laboratory and those of others indicate that a preponderance of vasoconstrictor prostanoids are produced in vessels and tissues frompreeclamptic women. Methods and Results: We have selected a bioassay (acute release of human umbilical vein endothelial cell prostaglandins) as a paradigm to identify the placenta- and plasma-derived factors responsible for endothelial cell activation in preeclampsia. Our data indicate that the enzyme responsible for prostaglandin synthesis in activated endothelial cells is a member of the family of phospholipases A2. Assays of enzyme activity and immunoblotting of specific PLA2 isoforms are in progress to characterize the enzyme(s) induced in activated cells. Fatty acid substrate transport in the circulation by albumin isoforms, and ultimately into maternal endothelial cells, also appears to be abnormal in preeclampsia. Using isoelectric focusing we haveshown that plasma concentrations of pI=4.8 albumin, an isoform that is relatively rich in fatty acids, are increased significantly in women with preeclampsia compared to normal pregnant controls. We propose that specific fatty acids bound to plasma albumin are the precursors responsible for increased prostaglandin production. Mass spectroscopy will be used to identify the fatty acids associated with plasma albumin isolated from preeclamptic and normal pregnant women. Discussion: The proposed studies will characterize the substrates and enzymes which perturb prostaglandin biosynthesis in preeclampsia. An understanding of these molecules should provide targets for the future development of novel therapeutic antagonists for the rational treatment and possible prophylaxis of preeclampsia.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR001614-19
Application #
6308878
Study Section
Project Start
2000-03-01
Project End
2002-02-28
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
19
Fiscal Year
2000
Total Cost
$9,880
Indirect Cost
Name
University of California San Francisco
Department
Type
DUNS #
073133571
City
San Francisco
State
CA
Country
United States
Zip Code
94143
MacRae, Andrew J; Mayerle, Megan; Hrabeta-Robinson, Eva et al. (2018) Prp8 positioning of U5 snRNA is linked to 5' splice site recognition. RNA 24:769-777
Katsuno, Yoko; Qin, Jian; Oses-Prieto, Juan et al. (2018) Arginine methylation of SMAD7 by PRMT1 in TGF-?-induced epithelial-mesenchymal transition and epithelial stem-cell generation. J Biol Chem 293:13059-13072
Sahoo, Pabitra K; Smith, Deanna S; Perrone-Bizzozero, Nora et al. (2018) Axonal mRNA transport and translation at a glance. J Cell Sci 131:
Tran, Vy M; Wade, Anna; McKinney, Andrew et al. (2017) Heparan Sulfate Glycosaminoglycans in Glioblastoma Promote Tumor Invasion. Mol Cancer Res 15:1623-1633
Liu, Tzu-Yu; Huang, Hector H; Wheeler, Diamond et al. (2017) Time-Resolved Proteomics Extends Ribosome Profiling-Based Measurements of Protein Synthesis Dynamics. Cell Syst 4:636-644.e9
Kintzer, Alexander F; Stroud, Robert M (2016) Structure, inhibition and regulation of two-pore channel TPC1 from Arabidopsis thaliana. Nature 531:258-62
Bikle, Daniel D (2016) Extraskeletal actions of vitamin D. Ann N Y Acad Sci 1376:29-52
Twiss, Jeffery L; Fainzilber, Mike (2016) Neuroproteomics: How Many Angels can be Identified in an Extract from the Head of a Pin? Mol Cell Proteomics 15:341-3
Cil, Onur; Phuan, Puay-Wah; Lee, Sujin et al. (2016) CFTR activator increases intestinal fluid secretion and normalizes stool output in a mouse model of constipation. Cell Mol Gastroenterol Hepatol 2:317-327
Posch, Christian; Sanlorenzo, Martina; Vujic, Igor et al. (2016) Phosphoproteomic Analyses of NRAS(G12) and NRAS(Q61) Mutant Melanocytes Reveal Increased CK2? Kinase Levels in NRAS(Q61) Mutant Cells. J Invest Dermatol 136:2041-2048

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