Localization of 2′,3′-cyclic nucleotide-3′-phosphohydrolase within the vertebrate retina

Dana Giulian, Victoria Iwanij, Grace Dean, Robert J. Drummond

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8 Scopus citations


Histochemical and immunochemical techniques are used to locate 2′,3′-cyclic nucleotide-3′-phosphohydrolase (2′,3′-cNMP-3′ase) within cells of the vertebrate retina. A new histochemical method is described which links the hydrolysis of 2′,3′-cNADP to the formation of a reduced, insoluble tetrazolium formazan. Photoreceptors from fish, bovine, and rat retinas are stained by this procedure. The reaction is blocked by 2′-AMP, a known inhibitor of 2′,3′-cNMP-3′ase. Rabbit antibodies prepared against 2′,3′-cNMP-3′ase from bovine brain are found to cross-react with bovine and rat retinal enzymes. Peroxidase-labeled antibody shows by light microscopy the greatest staining along the inner segments of the photoreceptors. Electron microscopy of the same preparations confirm binding to the plasma membrane of the inner segments of both rods and cones. Retinal 2′,3′-cNMP-3′ase is thus predominantly associated with the photoreceptors, suggesting some role for 2′,3′-cyclic nucleotides as substrates in visual function.

Original languageEnglish (US)
Pages (from-to)217-225
Number of pages9
JournalBrain Research
Issue number2
StatePublished - Apr 18 1983
Externally publishedYes


  • 2′,3′-cyclic nucleotide
  • 3′-phosphohydrolase
  • cyclic nucleotides
  • histochemistry
  • immunohistochemistry
  • photoreceptors


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