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Calponin h1 suppresses tumor growth of Src-induced transformed 3Y1 cells in association with a decrease in

Miwako Kaneko1, Michiko Takeoka, Misae Oguchi

  • 1Department of Dermatology, Shinshu University School of Medicine, Matsumoto 390-8621, Japan.

Japanese Journal of Cancer Research : Gann
|April 30, 2003
PubMed

Insights

Calponin h1 (CNh1) acts as a tumor suppressor by inhibiting cell proliferation and tumor growth. This protein reduces tumor volume and angiogenesis, primarily by decreasing vascular endothelial growth factor (VEGF) expression.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Calponin h1 (CNh1) is an actin-binding protein found in smooth muscle cells.
  • CNh1 has demonstrated tumor suppressor activity in leiomyosarcoma and fibrosarcoma cell lines.
  • Its role in inhibiting actomyosin MgATPase is known, but its broader tumor suppressor functions require further investigation.

Purpose of the Study:

  • To investigate the tumor suppressor function of Calponin h1 (CNh1) in a v-src-transformed rat fibroblast cell line (SR-3Y1).
  • To determine the mechanisms by which CNh1 might inhibit tumor growth, proliferation, and angiogenesis.

Main Methods:

  • Transfection of the human CNh1 gene into SR-3Y1 cells.
  • In vivo tumor volume assessment in nude mice.
  • Pathological analysis of tumor tissues, including mitotic cell and vessel counts.
  • In vitro assessment of DNA synthesis, cellular growth, and cell motility.
  • Analysis of vascular endothelial growth factor (VEGF) mRNA and protein expression.

Main Results:

  • CNh1 transfection significantly reduced tumor volume in vivo.
  • A decrease in mitotic cells and tumor vascularization was observed in CNh1-expressing tumors.
  • In vitro, CNh1 reduced DNA synthesis (without serum) and cellular motility.
  • Marked reduction in VEGF mRNA and protein secretion was noted in CNh1-transfected cells.

Conclusions:

  • CNh1 functions as a tumor suppressor in SR-3Y1 cells.
  • CNh1 primarily suppresses tumor growth by reducing VEGF expression and subsequent angiogenesis.
  • Partial suppression of cellular proliferation and motility also contributes to CNh1's tumor suppressor activity.

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