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Related Experiment Videos

Elevated pressure stimulates protooncogene expression in isolated mesenteric arteries

S P Allen1, H M Liang, M A Hill

  • 1Department of Physiology, Eastern Virginia Medical School, Norfolk 23501, USA.

The American Journal of Physiology
|October 1, 1996
PubMed
Summary

Increased blood pressure alone stimulates immediate early gene expression in small arteries, indicating that wall stress, not just pressure, drives vascular growth. This study offers a new model for mechanotransduction research.

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Area of Science:

  • Vascular biology
  • Molecular biology
  • Cardiovascular physiology

Background:

  • Vascular wall growth is linked to immediate early genes.
  • Understanding the stimuli for vascular growth is crucial for cardiovascular health.

Purpose of the Study:

  • To determine if increased pressure alone can induce immediate early genes in isolated small arteries.
  • To investigate the role of wall stress as a mechanical signal in vascular gene expression.

Main Methods:

  • Isolated rat mesenteric arteries were subjected to controlled pressure (90 mmHg vs. 140 mmHg).
  • In situ hybridization was used to quantify mRNA levels of c-fos, c-myc, and 18S rRNA.
  • Beta-actin mRNA levels were measured to assess nonspecific gene activation.

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Main Results:

  • Hypertensive pressure (140 mmHg) significantly increased c-fos and c-myc mRNA levels within 30-180 minutes.
  • 18S rRNA levels also increased in hypertensive vessels after 180 minutes.
  • Beta-actin mRNA levels remained unchanged, indicating specific gene induction.

Conclusions:

  • Increased pressure is a sufficient stimulus for protooncogene and rRNA induction in arterial smooth muscle cells.
  • Wall stress, rather than transmural pressure alone, is likely the key mechanical signal.
  • This model system is valuable for studying pressure mechanotransduction in vascular cells.