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Related Experiment Videos

Inducible microglial nitric oxide synthase: a large membrane pool

P L Wood1, S Choksi, V Bocchini

  • 1Department of Pharmacology, CoCensys, Inc., Irvine, CA 92718.

Neuroreport
|April 14, 1994
PubMed
Summary

Microglia use inducible nitric oxide synthase (NOS) in both the cytoplasm and cell membrane to protect the brain. This membrane-associated NOS may target extracellular pathogens and tumors effectively.

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Area of Science:

  • Neuroimmunology
  • Cellular Biology
  • Biochemistry

Background:

  • Microglia are the primary immune cells of the central nervous system.
  • They possess mechanisms to eliminate pathogens and tumor cells, including nitric oxide (NO) production.
  • Nitric oxide can inhibit essential cellular processes like glycolysis, the TCA cycle, and DNA synthesis.

Purpose of the Study:

  • To investigate the localization and regulation of inducible nitric oxide synthase (NOS) in microglia.
  • To explore the potential physiological relevance of different NOS compartments.

Main Methods:

  • Studied inducible NOS in lipopolysaccharide (LPS)-treated microglia.
  • Assessed the effects of NOS inhibitors, Ca2+, and calmodulin antagonists on NOS activity.
  • Investigated both cytosolic and membrane-bound NOS pools.

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Main Results:

  • Inducible NOS in microglia exists in both cytosolic and membrane-bound pools.
  • Both pools were potently inhibited by NOS inhibitors.
  • Ca2+ did not affect NOS activity, but calmodulin antagonists partially inhibited it.

Conclusions:

  • Microglial inducible NOS comprises at least two compartments: cytosolic and membrane-associated.
  • The membrane-associated pool may represent a novel isoform.
  • This compartmentalization could allow targeted extracellular NO delivery to pathogens and tumors, sparing microglia.