Faculty Collaboration Database

The "ON"-bipolar agonist, L-2-amino-4-phosphonobutyrate, blocks light-evoked cone contraction in xenopus eye cups. Neurochem Res 1992 Jan;17(1):75-80

Date

01/01/1992

Pubmed ID

1538827

DOI

10.1007/BF00966867

Scopus ID

2-s2.0-0026555065 (requires institutional sign-in at Scopus site)   16 Citations

Abstract

Rhythmic photoreceptor metabolism in relationship to light-dark cycles is now thought to be regulated through a retinal feed-back mechanism with dopamine serving as a principal signal initiating light-evoked events. In order to test the hypothesis that depolarizing "ON"-bipolar neurons participate in the retinal signalling pathway, we determined the effects of L-2-amino-4-phosphonobutyrate (L-APB) on light-evoked cone contraction in eye cups from Xenopus laevis. L-APB blocked the response stereospecifically when applied over a broad concentration range. The high specificity of L-APB in retina suggests that sign-inverting bipolar neurons which depolarize in light are in the signalling pathway. One possibility is that this pathway conveys signals that regulate dopamine release.

Author List

Besharse JC

MESH terms used to index this publication - Major topics in bold

Aminobutyrates
Animals
Dopamine
Dopamine Antagonists
Light
Photoreceptor Cells
Signal Transduction
Xenopus laevis