Human retinal pigment epithelial cells possess v1 vasopressin receptors

Zvi Friedman, T. Mary Delahunty, Joel Linden, Peter A. Campochiaro

Research output: Contribution to journalArticlepeer-review

Abstract

Membrane preparations of cultured human retinal pigment epithelial (RPE) cells were incubated with various concentrations of [3H]arginine vasopressin (AVP) in the presence and absence of 10 uM nonradioactive AVP. Saturable, specific binding to a single site with a Kd of 6.2 nM and Bmax of 111 fmol/mg protein was detected. Vaaopressin had no effect on RPE cyclic AMP levels measured by radioimmunoassay. Intracellular calcium fluxes were measured by spectrofluorometry of RPE cell suspensions preloaded with quin 2. The baseline cytosolic calcium level was 217 ± 20 nM, and AVP caused a concentration-dependent increase in this level with a 3.5-fold maximal response at 10--6 M and an EC50 of 120 nM. The production of inositol phosphates was measured in RPE preloaded with [3H]myoinositol, and AVP caused a concentration-dependent increase in their production with a 2.1-fold maximal response at 10--5 M and an EC50 of 80 nM. A specific vasopressin receptor antagonist, SKF 101926, prevented the AVP-induced increase in calcium mobilization and ionistol phosphate production in RPE. These data suggest that RPE cells possess V1 AVP receptors coupled to calcium mobilization and inositol phosphate metabolism.

Original languageEnglish (US)
Pages (from-to)811-816
Number of pages6
JournalCurrent Eye Research
Volume10
Issue number9
DOIs
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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