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Related Experiment Videos

Nitrobenzylthioinosine binding in brain: an interspecies study.

A Verma, P J Marangos

    Life Sciences
    |January 21, 1985
    PubMed
    Summary

    [3H]nitrobenzylthioinosine ([3H]NBI) binding to brain membranes showed similar high affinity across species. Adenosine uptake inhibitors blocked binding in most species, except rats, suggesting a unique anomaly.

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    UNDERSTANDING THE LONG-TERM INTERPLAY BETWEEN GLUCOCORTICOIDS, PARATHYROID HORMONE LEVELS, AND OSTEOPOROSIS IN PATIENTS.

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    Area of Science:

    • Neuropharmacology
    • Biochemistry
    • Molecular Biology

    Background:

    • Adenosine is a crucial neuromodulator in the central nervous system.
    • Adenosine uptake transporters play a key role in regulating extracellular adenosine levels.
    • Nitrobenzylthioinosine ([3H]NBI) is a potent radioligand used to study adenosine transporters.

    Purpose of the Study:

    • To characterize the binding of [3H]NBI to adenosine uptake sites in cerebral cortical membranes from multiple species.
    • To investigate the inhibitory effects of known adenosine uptake blockers and calcium channel antagonists on [3H]NBI binding.
    • To explore potential species-specific differences in adenosine transporter binding characteristics.

    Main Methods:

    • Radioligand binding assays using [3H]NBI on membrane preparations from human, dog, guinea pig, rat, and mouse cerebral cortex.
    • Kinetic analysis to determine binding parameters (Kd, Bmax).
    • Competitive inhibition studies with dilazep, hexobendine, dipyridamole, and dihydropyridine calcium antagonists.

    Main Results:

    • High-affinity, reversible, saturable binding of [3H]NBI was observed in all five species with comparable kinetic parameters (Kd = 0.16-0.44 nM; Bmax = 128-196 fmol/mg prot.).
    • Dilazep, hexobendine, and dipyridamole potently inhibited [3H]NBI binding in human, dog, guinea pig, and mouse, but not in rat preparations, indicating competitive binding at the same site.
    • Dihydropyridine calcium antagonists exhibited lower potency inhibition, with the most significant effects observed in dog and human tissues, suggesting a link between calcium channels and adenosine uptake sites.

    Conclusions:

    • Adenosine uptake sites exhibit conserved high-affinity binding characteristics across human, dog, guinea pig, and mouse species.
    • The rat brain presents a unique anomaly regarding the inhibition of [3H]NBI binding by certain adenosine uptake blockers.
    • A potential relationship exists between calcium channels and adenosine uptake sites, particularly evident in human and canine tissues.

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