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Decrease in p53 protein in cultured cardinal ligament fibroblasts from patients with prolapsus uteri

M Yamamoto1, M Aoyagi, K Akazawa

  • 1Department of Cell Biology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173, Japan.

Cell Biology International
|November 26, 1998
PubMed
Summary
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Fibroblasts from uterine prolapse patients show higher growth rates and altered growth factor responses compared to controls. This is linked to reduced p53 and p21 protein expression, potentially affecting tissue support.

Area of Science:

  • Cell Biology
  • Connective Tissue Research
  • Gynecological Pathology

Background:

  • Uterine prolapse involves connective tissue dysfunction.
  • Fibroblast proliferation is crucial for tissue integrity.

Purpose of the Study:

  • To investigate the proliferative characteristics of fibroblasts from patients with uterine prolapse (HPLiF) compared to controls (HCLiF).
  • To explore the role of growth factors and cell cycle regulators in fibroblast behavior.

Main Methods:

  • Cell culture of human prolapse ligamental fibroblasts (HPLiF) and control ligamental fibroblasts (HCLiF).
  • Assessment of growth rates, saturation density, and DNA synthesis in response to growth factors (PDGF, IGF-I, EGF).
  • Analysis of p53 protein, p53 mRNA, and p21 protein expression.

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Main Results:

  • HPLiF exhibited higher saturation density than HCLiF.
  • Platelet-derived growth factor (PDGF) alone stimulated DNA synthesis in HPLiF, unlike in HCLiF.
  • PDGF, IGF-I, and EGF synergistically increased DNA synthesis in both cell types, with a greater effect in HPLiF.
  • HPLiF showed decreased p53 protein and mRNA, and reduced p21 protein levels compared to HCLiF.

Conclusions:

  • Higher proliferative activity in prolapse fibroblasts may stem from decreased p53 and p21 expression.
  • This altered cell cycle regulation could impair elastin synthesis and deposition, contributing to weakened uterine connective tissues.