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Villous trophoblast cell turnover in placentas from preterm pregnancy and pregnancy complicated by intrauterine growth restriction (IUGR)

100%

Zadrozna M., Nowak B., Marcinek A., Duc J.

Folia Biologica

2010

vol. 58

issue 1-2

79-83

Disturbed trophoblast turnover, a key process in placental physiology, may lead to a number of pregnancy-associated pathologies. This study examines PCNA expression and describes and quantifies morphological changes during trophoblast turnover in preterm placentas and termplacentas complicated by IUGR. The number of CTF cells increased two-fold in preterm and IUGR placentas. A concurrent and slightly reduced proliferation rate of these cells was also found. The number of STF nuclei of terminal villi was lower by 21%in IUGR and by 18% in pretermplacentas (P>0.05). A statistically significant reduction of the number of syncytial knots by 50% as compared to the control placentas was observed. Correlations between PCNA-reactive CTF nuclei and syncytial knots, PCNA-reactive CTF nuclei and CCO activity, and CCO activity and syncytial knots were found. Moreover, a strong inverse relation was observed between syncytial knots and CTF cells, and CCO activity and CTF cells.

Recent environmental toxic effect in the Polish Copper Mining Territory on human reproduction. Part I. Response of the placenta to the chemical stress

75%

Zadrozna M.

Folia Biologica

2003

vol. 51

issue 3-4

201-205

collected from healthy non-smoking women living in the high polluted region, i.e. the Copper Mining Territory (CMT) and the 38 control placentas (C) obtained from little polluted eastern Carpathian regions. The placentas were studied by histochemical, immunohistochemical and morphometric methods. In CMT placentas a decrease in the cytochrome c oxidase and glucose-6-phosphate activities and the immunoreactivity of glutathione S-transferase pi in the villous syncytiotrophoblast and amniotic epithelium was noted. All CMT placentas showed abundance of mineral and fibrinoid deposits and of lipid droplets. This produced a compensatory increase in the mother-fetus exchange area due to excessive proliferation of placental villi which in turn decreased the intervillous space and thus the influx of indispensable maternal blood. Lately slight signs of increase in the cytochrome c oxidase activity accompanied by a noticeable decrease in number of the thinnest (most abundant) terminal villi is observed.

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2 Folia Biologica

1 2010

1 2003

2 Zadrozna M.

1 Duc J.

1 Marcinek A.

1 Nowak B.

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Villous trophoblast cell turnover in placentas from preterm pregnancy and pregnancy complicated by intrauterine growth restriction (IUGR)

Recent environmental toxic effect in the Polish Copper Mining Territory on human reproduction. Part I. Response of the placenta to the chemical stress