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Related Experiment Videos

Nitric oxide: an ancestral immunocyte effector molecule

A Franchini1, A Conte, E Ottaviani

  • 1Department of Animal Biology, University of Modena, Italy.

Advances in Neuroimmunology
|January 1, 1995
PubMed
Summary
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Molluscan hemocytes possess inducible nitric oxide synthase (NOS), producing nitric oxide (NO) to fight bacteria. This finding highlights conserved immune molecules in invertebrates and vertebrates.

Area of Science:

  • Immunology
  • Biochemistry
  • Evolutionary Biology

Background:

  • Nitric oxide synthase (NOS) plays a crucial role in various physiological processes.
  • Understanding NOS in invertebrates like mollusks can provide insights into conserved immune mechanisms.

Purpose of the Study:

  • To investigate the presence, inducibility, and function of NOS in molluscan hemocytes.
  • To characterize the biochemical properties of molluscan NOS and compare it to known mammalian isoforms.

Main Methods:

  • Immunocytochemistry using anti-NOS polyclonal antibody.
  • Histochemical detection of NADPH-diaphorase activity.
  • Biochemical assays for enzyme localization, substrate kinetics, and cofactor dependence.

Main Results:

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  • NOS immunoreactivity was detected in hemocytes and increased upon bacterial stimulation (Escherichia coli), indicating inducibility.
  • Biochemical analysis revealed NOS is primarily cytoplasmic and shares properties with mammalian NOS, but is distinct.
  • Hemocytes were shown to produce nitric oxide (NO), a bactericidal substance, linking the NO system to phagocytosis.

Conclusions:

  • Molluscan hemocytes express an inducible NOS, contributing to innate immunity through nitric oxide production.
  • The presence of NO in invertebrate hemocytes suggests evolutionary conservation of key immune molecules.
  • Molluscan NOS exhibits characteristics similar to inducible forms of human NOS, suggesting conserved functional domains.