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Adenosine uptake and [3H]nitrobenzylthioinosine binding in developing rat brain
1Department of Pharmacology and Therapeutics, University of Manitoba, Faculty of Medicine, Winnipeg, Canada.
Brain Research
|December 15, 1987
Summary
Adenosine transporter ontogenesis in rats shows significant developmental changes. [3H]Nitrobenzylthioinosine ([3H]NBI) binding and adenosine uptake vary by brain region and age, indicating dynamic maturation of these sites.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Adenosine transporters play crucial roles in neurotransmission and cellular energy homeostasis.
- Understanding the developmental trajectory of adenosine transport sites is essential for comprehending brain maturation and function.
Purpose of the Study:
- To investigate the ontogenesis of adenosine transport sites in the developing rat brain.
- To characterize changes in [3H]nitrobenzylthioinosine ([3H]NBI) binding and [3H]adenosine accumulation during postnatal development.
Main Methods:
- Radioligand binding assays using [3H]NBI on membrane preparations from whole brain and specific regions (cortex, cerebellum, hypothalamus, superior colliculus) of rats at various postnatal ages.
- Analysis of [3H]NBI binding kinetics (Bmax and Kd) and [3H]adenosine uptake in intact brain cells from newborn and adult rats.
Main Results:
- [3H]NBI binding showed region-specific ontogenetic patterns, with higher levels in young rats in some areas (cortex, cerebellum) and in adults in others (hypothalamus, superior colliculus).
- Changes in binding affinity (Kd) and capacity (Bmax) reflected developmental alterations, particularly in the cortex and hypothalamus.
- [3H]Adenosine accumulation was significantly higher in newborn rat brain cells compared to adults, with distinct kinetic parameters for high- and low-affinity uptake.
Conclusions:
- Adenosine transport sites undergo significant developmental regulation in the rat brain, with distinct regional variations.
- [3H]NBI serves as a valuable radioligand for studying the ontogeny of functional adenosine transporters.
- The observed developmental changes in adenosine transport likely contribute to the maturation of neuronal function and energy metabolism in the brain.