Localization of gamma glutamyl transpeptidase in bovine retina

Lawrence S Morse, Ken Steinsapir, Jack Terrell, Yossi Sidikaro

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Gamma-glutamyl transpeptidase (GGTP) is a membrane bound enzyme which has an important role in regulation of glutathione and glutamate in the retina. We have used histochemical and colorimetric enzyme assays to localize GGTP in the bovine retina and choroid. Our results demonstrate that (i) GGTP is present in retinal microvessels but not choroidal microvessels. (ii) Retinal microvascular endothelium loses the ability to express GGTP in cultured cells, (iii) GGTP is present in Muller cells, (iv) Isolated and purified rod outer segments contain high levels of GGTP. (v) Retinal pigment epithelial cells (RPE) m vivo and in culture contain GGTP. The findings of this study lend support to the concept that GGTP may be a biochemical marker for cellular systems which are part of specialized diffusion barriers.

Original languageEnglish (US)
Pages (from-to)1131-1140
Number of pages10
JournalCurrent Eye Research
Issue number11
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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