title: Ontogenetic profile of the adenosine uptake sites in rat forebrain.
abstract: The ontogenesis of rat forebrain adenosine uptake sites labelled by [3H]nitrobenzylthioinosine ([3H]NBI) was determined and compared to that of rat forebrain adenosine receptors labelled by N6-cyclohexyl[3H]adenosine ([3H]-CHA). [3H]NBI binding is highly invariant with similar levels of [3H]NBI binding sites from embryonic day 19 to day 30 postpartum. Scatchard and Hill analyses reveal the binding of [3H]NBI in 6-day-old tissue to be indistinguishable from such binding in 30-day-old tissue. In contrast, [3H]-CHA binding is highly variant. [3H]CHA binding develops slowly but steadily from about embryonic day 19, with adult binding levels being achieved at around 25 days postpartum. The ontogenetic profile of [3H]CHA appears to coincide with synaptogenesis whereas that of [3H]NBI does not.
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives / Q000378:metabolism*; D000345:Affinity Labels / Q000378:metabolism; D000818:Animals; D001665:Binding Sites; D001921:Brain / Q000254:growth & development*; D005260:Female; D007700:Kinetics; D011247:Pregnancy; D051381:Rats; D011919:Rats, Inbred Strains; D011983:Receptors, Purinergic / Q000378:metabolism*; D013868:Thioinosine / Q000031:analogs & derivatives / Q000378:metabolism
chemical_list: D000345:Affinity Labels; D011983:Receptors, Purinergic; C027513:N(6)-cyclohexyladenosine; D013868:Thioinosine; C001789:4-nitrobenzylthioinosine; D000241:Adenosine