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Related Experiment Videos

Volume regulation in NIH/3T3 cells not expressing P-glycoprotein. I. Regulatory volume decrease

H Pasantes-Morales1, R Sánchez Olea, D Miranda

  • 1Institute of Cell Physiology, National University of Mexico, Mexico City, Mexico.

The American Journal of Physiology
|June 1, 1997
PubMed
Summary
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NIH/3T3 fibroblasts lacking P-glycoprotein demonstrate regulatory volume decrease (RVD) in response to hypotonic stress. This cell volume regulation shares characteristics with RVD observed in other cell types.

Area of Science:

  • Cell biology
  • Physiology
  • Biochemistry

Background:

  • P-glycoprotein is an efflux pump involved in cellular transport.
  • Regulatory volume decrease (RVD) is a cellular mechanism to restore volume after swelling.
  • NIH/3T3 fibroblasts are a commonly used cell line in biomedical research.

Purpose of the Study:

  • To investigate the RVD capabilities of NIH/3T3 fibroblasts lacking P-glycoprotein.
  • To characterize the ionic and molecular permeability of the RVD pathway in these cells.
  • To compare the RVD properties of NIH/3T3 fibroblasts to other cell types.

Main Methods:

  • NIH/3T3 fibroblasts were exposed to varying degrees of hyposmotic solutions.
  • Cell volume changes and recovery rates were monitored over time.

Related Experiment Videos

  • The effects of specific channel blockers and ion substitutions on RVD were assessed.
  • Permeability studies were conducted using various ions and amino acids.

    • Main Results:

    • NIH/3T3 fibroblasts exhibited significant cell swelling in response to hypotonic solutions.
    • Complete or near-complete RVD was observed within 30 minutes, except under severe hypotonic stress.
    • RVD was modulated by Cl and K channel blockers, extracellular Ca levels, and gramicidin.
    • The RVD pathway demonstrated high permeability to K+, Rb+, and various anions and neutral amino acids, but not basic amino acids.

    Conclusions:

    • NIH/3T3 fibroblasts lacking P-glycoprotein possess functional RVD mechanisms.
    • The RVD pathway in these cells involves K+ and anion transport, similar to other cell types.
    • These findings contribute to understanding cell volume regulation independent of P-glycoprotein expression.