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Related Experiment Videos

Increased lung inflation induces gene expression after pneumonectomy

K A Gilbert1, D E Rannels

  • 1Department of Cellular and Molecular Physiology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA.

The American Journal of Physiology
|August 5, 1998
PubMed
Summary
This summary is machine-generated.

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Mechanical signals initiate rapid gene expression changes in the lung after pneumonectomy. This immediate-early gene (IEG) response may drive compensatory lung growth, restoring tissue function.

Area of Science:

  • Physiology
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Compensatory lung growth after pneumonectomy restores tissue structure and function.
  • Molecular mechanisms driving compensatory lung growth are not fully understood.
  • The role of mechanical signals in initiating this process requires further investigation.

Purpose of the Study:

  • To investigate the role of mechanical signals in immediate-early gene (IEG) expression following pneumonectomy.
  • To elucidate the molecular response of the lung to mechanical stimuli after partial removal.

Main Methods:

  • Rats underwent left pneumonectomy, and gene expression in the remaining right lung was analyzed.
  • Isolated rat lungs were subjected to elevated airway pressures in vitro.

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  • In vitro lung perfusion models were used to assess gene expression changes.

    • Main Results:

    • Left pneumonectomy induced a rapid ninefold increase in c-fos and fourfold increase in junB expression in the right lung within 30 minutes.
    • No significant changes in c-jun or c-myc expression were observed post-pneumonectomy.
    • In vitro experiments demonstrated that elevated airway pressure and lung perfusion induced c-fos and junB expression in a time- and dose-dependent manner.

    Conclusions:

    • Mechanical signaling in the remaining lung initiates rapid changes in immediate-early gene expression after pneumonectomy.
    • Elevated IEG expression is a key early event that likely contributes to the initiation of compensatory lung growth.
    • This study highlights the mechanotransduction pathways involved in lung regeneration.