Receptor Adaptive Responsiveness in Disease Models: 6-Ohda Lesioned and Spontaneously Hypertensive Rats

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Abstract
We have examined the adaptive modifications of brain monoamine receptors in response to pathophysiological processes in animal disease models: 6-OHDA lesioned and spontaneously hypertensive rats (SHR). The two models share a similar increase in D-1 receptor densities, while noradrenergic receptors are affected in different way: α;-1 and β are supersensitive in 6-OHDA lesioned rats and only α;-2 are increased in SHR. S-1 receptors too are up-regulated in SHR. We must notice that though receptor hypersensitivity in the 6-OHDA model is linked to massive decreases in neurotransmitter levels, this mechanism seems not to exist in the SHR model.