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What are aquaporins for?

A E Hill1, B Shachar-Hill, Y Shachar-Hill

  • 1The Physiological Laboratory, University of Cambridge, Downing St., Cambridge CB2 3EG, UK. aehill@ntlworld.com

The Journal of Membrane Biology
|March 12, 2004
PubMed
Summary

Aquaporins (AQPs) may not primarily increase water flow. Instead, these ubiquitous membrane proteins likely function as sensors for osmotic and turgor pressure gradients, regulating cellular processes.

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Area of Science:

  • Cell biology
  • Biophysics
  • Physiology

Background:

  • Aquaporins (AQPs) are membrane proteins traditionally thought to facilitate water and small solute transport.
  • The 'simple permeability hypothesis' (SPH) explains their role in processes like epithelial fluid transport, plant transpiration, and microbial osmoregulation.
  • However, experimental evidence from genetic knockouts often fails to fully support the SPH.

Purpose of the Study:

  • To critically evaluate the prevailing 'simple permeability hypothesis' (SPH) for aquaporin function.
  • To propose and investigate an alternative hypothesis where aquaporins act as sensors for osmotic and turgor pressure gradients.
  • To explore the mechanistic basis and cellular implications of aquaporins functioning as sensors.

Main Methods:

  • Analysis of existing literature and experimental data, including genetic manipulation studies (knockouts, antisense transgenics, null mutants).
  • Theoretical modeling of aquaporin monomer structure and tetrameric configuration to propose a sensing mechanism.
  • Examination of how the proposed sensor function aligns with known aquaporin roles in diverse organisms.

Main Results:

  • The SPH is insufficient to explain aquaporin presence and function in various cellular and tissue contexts.
  • Genetic elimination or reduction of AQPs yields effects that are often partial or difficult to reconcile with a simple permeability role.
  • A mechanistic model suggests AQPs can sense osmotic and turgor pressure gradients through structural changes.
  • This sensor function is proposed to regulate downstream cellular processes via signaling pathways.

Conclusions:

  • Aquaporins are likely more than just water channels; their primary role may be sensing osmotic and turgor pressure gradients.
  • The proposed sensor hypothesis offers a unifying explanation for aquaporin involvement across animal, plant, and microbial systems.
  • This reframes aquaporins as crucial cellular sensors involved in feedback regulation of physiological processes.

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