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Updated: Jun 25, 2026
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Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area
Published on: August 10, 2012
The renal dopaminergic system in ageing
1Dipartimento di Scienze Neurologiche, Università La Sapienza, Roma, Italy.
Journal of Autonomic Pharmacology
|January 1, 1990
Summary
The aging kidney shows a significant decline in dopamine DA-1 receptors, particularly in tubules. This age-related impairment of the renal dopaminergic system impacts kidney function over time.
Area of Science:
- Nephrology
- Neuroscience
- Pharmacology
Background:
- The kidney possesses substantial dopamine (DA) stores and DA-1/DA-2 receptors.
- Age-related changes in the renal dopaminergic system remain largely uncharacterized.
Purpose of the Study:
- To investigate age-associated alterations in the renal dopamine DA-1 receptor system.
- To quantify changes in DA-1 receptor density and affinity in rat kidneys across different age groups.
Main Methods:
- Utilized radioreceptor binding and autoradiographic techniques on rat kidney tissues.
- Employed [3H]-SCH 23390 as a specific ligand for DA-1 receptors.
- Compared young, adult, and aged male Wistar rats.
Main Results:
- A significant reduction in DA-1 receptor density was observed in adult rats compared to young rats, with no change in affinity.
- Aged rats exhibited a further decrease in DA-1 binding site density compared to adult rats.
- Autoradiography showed DA-1 receptors concentrated in proximal tubules, with a greater age-related loss in tubular versus vascular receptors.
Conclusions:
- The renal DA-1 receptor system undergoes significant impairment with advancing age.
- Age-related decline in renal DA-1 receptors mirrors changes observed in the striatal D-1 receptor system.
- These findings highlight the impact of aging on kidney dopaminergic signaling.
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