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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Aquaporins in Nervous System.

Mengmeng Xu1, Ming Xiao2, Shao Li3

  • 1Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing, 100191, China.

Advances in Experimental Medicine and Biology
|March 5, 2017
PubMed
Summary

Aquaporins (AQPs) are crucial for water transport in the central nervous system (CNS). Understanding AQP roles, especially AQP4, offers potential therapeutic targets for brain disorders like cerebral edema.

Keywords:
AquaporinsBrain disordersNervous system

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • Aquaporins (AQPs) facilitate water movement across cell membranes.
  • Nine AQP subtypes are expressed in the central nervous system (CNS), with AQP4 being predominant.
  • AQPs also play roles in the peripheral nervous system (PNS).

Purpose of the Study:

  • To review the expression and function of AQPs in the CNS and PNS.
  • To highlight the role of AQP4 in CNS water homeostasis and edema.
  • To explore the potential of AQPs as therapeutic targets for brain disorders.

Main Methods:

  • Literature review focusing on AQP expression and function in the nervous system.
  • Analysis of AQP involvement in physiological and pathological processes.
  • Examination of AQP roles in specific brain disorders.

Main Results:

  • The CNS expresses nine AQP subtypes, including aquaporins, aquaglyceroporins, and superaquaporins.
  • AQP4 is critical for managing cytotoxic and vasogenic edema in the CNS.
  • AQPs are implicated in the pathology of neuromyelitis optica, brain tumors, and Alzheimer's disease.

Conclusions:

  • Aquaporins are vital for water balance in the CNS and PNS.
  • AQP4's role in edema highlights its significance in neurological diseases.
  • Targeting AQPs may offer new treatment strategies for CNS disorders, particularly cerebral edema.