Abstract
Nitrotyrosine residues (NT), an index of oxidative stress arising from peroxynitrite formation and action, are found in placental vasculature of pregnancies complicated by pre-eclampsia (PE) or pregestational insulin-dependent diabetes mellitus (IDDM). This study correlates conventional placental pathology with NT immunostaining in 20 cases of perinatal mortality (13 stillbirths and seven cases of neonatal mortality) associated with PE, IDDM, amniotic fluid infection syndrome (AFIS), or from fetal/neonatal demise not related to these conditions (congenital anomalies) (n = five/group). Patients with PE have more decidual arteriolopathy and Tenney-Parker change, while patients with IDDM and ascending infection have more villous cytotrophoblastic hyperplasia. Archival paraffin-embedded placental sections were immunostained for NT for correlation with clinical features and H&E histological findings. The intensity of immunostaining for NT varied from absent (n = 7) to 1+ (n = 5) or 2+ (n = 8). All eight placentae with 2+ staining showed increased villous extracellular matrix (ECM), compared to none of five with 1+ staining and two of seven with no staining (chi2 = 14.3, P = 0.001). There was no statistically significant difference i...Continue Reading
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