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Adenosine in vertebrate retina: Localization, receptor characterization, and function

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Summary

  1. 1.

    The uptake of [3H] adenosine into specific populations of cells in the inner retina has been demonstrated. In mammalian retina, the exogenous adenosine that is transported into cells is phosphorylated, thereby maintaining a gradient for transport of the purine into the cell.

  2. 2.

    Endogenous stores of adenosine have been demonstrated by localization of cells that are labeled for adenosine-like immunoreactivity. In the rabbit retina, certain of these cells, the displaced cholinergic, GABAergic amacrine cells, are also labeled for adenosine.

  3. 3.

    Purines are tonically released from dark-adapted rabbit retinas and cultured embryonic chick retinal neurons. Release is significantly increased with K+ and neurotransmitters. The evoked release consists of adenosine, ATP, and purine metabolites, and while a portion of this release is Ca2+ dependent, one other component may occur via the bidirectional purine nucleoside transporter.

  4. 4.

    Differential distributions of certain enzymes involved in purine metabolism have also been localized to the inner retina.

  5. 5.

    Heterogeneous distributions of the two subtypes of adenosine receptors, A1 and A2, have been demonstrated in the mammalian retina. Coupling of receptors to adenylate cyclase has also been demonstrated.

  6. 6.

    Adenosine A1 receptor agonists significantly inhibit the K+-stimulated release of [3H]-acetylcholine from the rabbit retina, suggesting that endogenous adenosine may modulate the light-evoked or tonic release of ACh.

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  1. Departments of Biochemistry and Molecular Biophysics, Anatomy-Neurobiology, and Ophthalmology and Visual Sciences, Washington University School of Medicine, 660 South Euclid Avenue, Box 8231, 63110, St. Louis, Missouri, USA

    Christine Blazynski

  2. Department of Ophthalmology, University of Lund, S-221 85, Lund, Sweden

    Maria-Thereza R. Perez

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Blazynski, C., Perez, MT.R. Adenosine in vertebrate retina: Localization, receptor characterization, and function. Cell Mol Neurobiol 11, 463–484 (1991). https://doi.org/10.1007/BF00734810

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