Journal
JOURNAL OF REPRODUCTIVE IMMUNOLOGY
Volume 79, Issue 1, Pages 79-84Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.jri.2008.08.001
Keywords
Platelets; TGF-beta(1); Preeclampsia; Pregnancy
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, Brazil (FAPESP) [2002/09590-0]
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Objectives: Platelets and transforming growth factor-beta(1) (TGF-beta(1)) are thought to be involved in the pathogenesis of preeclampsia. Our objectives were to determine plasma concentration of TGF-beta(1) in normotensive and preeclamptic women in the third trimester of pregnancy and to evaluate the correlation of TGF-beta(1) plasma levels with platelet count and agonist-induced aggregation capacity. Methods: Thirty-three women with preeclampsia were compared with 36 healthy women with uncomplicated pregnancies. Peripheral venous blood samples were obtained, and TGF-beta(1) plasma levels measured by an enzyme-linked immunoassay. Platelet aggregation was induced by the agonist agents adenosine diphosphate (ADP), collagen and epinephrine, and was determined in platelet-rich plasma by aggregometry. Results: Plasma concentrations of active TGF-beta(1) were significantly higher in preeclamptic women (10.41 +/- 2.07 ng/mL) compared with normotensive pregnant women (7.01 +/- 3.29 ng/mL). Platelet number and platelet agonist-induced aggregation percent were significantly lower in patients with precclampsia than in healthy pregnant women. A significant correlation was observed between TGF-beta(1) plasma levels and platelet agonist-induced aggregation percent as between plasma levels of TGF-beta(1) and platelet number in preeclamptic patients. Conclusion: The association between impairment in platelet responsiveness and higher levels of TGF-beta(1) in the plasma of patients with preeclampsia suggests that this cytokine may play a role in the pathophysiological events of preeclampsia that are dependent on platelet activation. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
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