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Related Experiment Videos

Modulation of tumor angiogenesis by stem cell factor.

W Zhang1, G Stoica, S I Tasca

  • 1Cardiovascular Research Institute and Department of Medical Physiology, The Texas A&M University System Health Science Center, College Station, Texas 77843-1114, USA.

Cancer Research
|December 16, 2000
PubMed
Summary

Stem cell factor (SCF) influences tumor angiogenesis and growth. Manipulating SCF levels in mammary tumors affected mast cell numbers and blood vessel density, impacting tumor size.

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Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Mast cells infiltrate solid tumors and release angiogenic factors, potentially influencing tumor vascularization.
  • Stem cell factor (SCF) is known to stimulate mast cell activity, suggesting a role in tumor microenvironment modulation.

Purpose of the Study:

  • To investigate the role of Stem cell factor (SCF) in tumor angiogenesis and growth.
  • To determine how manipulating SCF levels impacts mast cell accumulation and tumor vascularization in mammary tumors.

Main Methods:

  • Rat mammary tumor cell lines were established and transfected with sense or antisense SCF DNA constructs.
  • Tumorigenicity and functional SCF levels were confirmed in transfected cell lines.
  • Immunohistochemical analysis was performed on induced tumors to assess mast cell number, microvascular density, and von Willebrand factor expression.

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Main Results:

  • Tumors with increased SCF (S-P) showed significantly higher mast cell numbers and microvascular density compared to controls (C-P).
  • Tumors with decreased SCF (AS-P) exhibited significantly lower mast cell numbers and microvascular density.
  • Tumor growth was significantly inhibited in the AS-P group compared to both C-P and S-P groups.
  • Expression of von Willebrand factor, an endothelial cell marker, paralleled changes in microvascular density.

Conclusions:

  • Stem cell factor (SCF) plays a significant role in modulating tumor angiogenesis, likely through its effects on mast cells.
  • SCF levels directly influence tumor vascularization and growth rate.
  • Targeting SCF may represent a therapeutic strategy for controlling tumor angiogenesis and progression.