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Related Experiment Videos

Regulatory volume increase after hypertonicity- or vasoactive-intestinal-peptide-induced cell-volume decrease in

J A O'Brien1, R J Walters, M A Valverde

  • 1AFRC Institute of Animal Physiology and Genetics Research, Babraham, Cambridge, UK.

Pflugers Archiv : European Journal of Physiology
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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Intestinal crypt cells regulate volume via a Na+-K+-2Cl- cotransporter. This mechanism responds to hypertonic shock and vasoactive intestinal peptide (VIP)-induced shrinkage, crucial for maintaining cell volume homeostasis.

Area of Science:

  • Cell biology
  • Physiology
  • Molecular biology

Background:

  • Intestinal crypts are vital for nutrient absorption and fluid balance.
  • Cell volume regulation is essential for cellular function and survival.
  • Vasoactive intestinal peptide (VIP) influences intestinal secretion and ion transport.

Purpose of the Study:

  • To investigate the mechanisms of cell volume regulation in guinea-pig small intestinal crypts.
  • To determine the ion transport pathways involved in regulatory volume increase (RVI) and secretagogue-induced volume increase (SVI).
  • To elucidate the role of the Na+-K+-2Cl- cotransporter in these processes.

Main Methods:

  • Isolation of intact crypts from guinea-pig small intestine.
  • Measurement of crypt cell volume under various osmotic conditions (hypertonic shock, VIP exposure).

Related Experiment Videos

  • Pharmacological inhibition of ion transport pathways using specific inhibitors (bumetanide, amiloride derivatives).

    • Main Results:

    • Crypt cells exhibited RVI following hypertonic shock, recovering volume within 20 minutes.
    • VIP-induced shrinkage involved KCl loss, with subsequent volume recovery (SVI) upon VIP removal.
    • Both RVI and SVI were dependent on Na+ and Cl-, inhibited by bumetanide, and consistent with Na+-K+-2Cl- cotransporter activation.

    Conclusions:

    • A Na+-K+-2Cl- cotransport mechanism is activated by cell shrinkage and VIP.
    • This transporter plays a critical role in both RVI and SVI in intestinal crypt cells.
    • Understanding these mechanisms is key to comprehending intestinal fluid and electrolyte balance.