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Morphological studies on the placenta

Y Honjoh1, Y Nishimura, N Kanomata

  • 1Department of Pathology, Kobe University School of Medicine, Japan.

The Kobe Journal of Medical Sciences
|February 1, 1994
PubMed
Summary

This study details placental development from 6 to 43 weeks. Key findings show changes in chorionic villi size, cell layers, and protein expression (hCG, hPL, SP-1) with gestational age.

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Area of Science:

  • Obstetrics and Gynecology
  • Developmental Biology
  • Histology

Background:

  • Placental morphology changes significantly throughout gestation.
  • Understanding these changes is crucial for monitoring fetal development and identifying potential complications.

Purpose of the Study:

  • To investigate the morphological and histological changes in the human placenta from 6 to 43 gestational weeks.
  • To correlate placental development with specific protein expression patterns.

Main Methods:

  • Morphological analysis of 109 placentae across a wide gestational range.
  • Soft X-ray imaging to assess placental development and vascularization.
  • Histological examination of chorionic villi, including cell layer analysis.
  • Immunohistochemical staining for human Chorionic Gonadotropin (hCG), human Placental Lactogen (hPL), and Specific Protein 1 (SP-1).

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Main Results:

  • Chorionic villi decrease in size with age, showing reduced interstitial cells and stroma.
  • The cytotrophoblastic cell layer diminishes after 24 weeks, while syncytial knots increase after 32 weeks.
  • Intervillous spaces narrow, and capillaries become congested in older placentae.
  • Syncytial knots and fibrin deposition increase with placental aging.
  • Immunohistochemistry reveals hCG positivity early in gestation, shifting to marked hPL and SP-1 positivity later.

Conclusions:

  • Placental morphology undergoes distinct transformations during pregnancy, impacting villous structure and vascularity.
  • Changes in cell layers and the appearance of syncytial knots are age-dependent indicators of placental maturation.
  • Protein expression patterns (hCG, hPL, SP-1) evolve throughout gestation, reflecting functional shifts in the placenta.