ArticleAutonomic neuroscience : basic & clinical2025
Blunted pressor response to peripheral sensory afferent nerve stimulation in intracerebroventricular-streptozotocin injected rats.
Article in Autonomic neuroscience : basic & clinical, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disorder. It is characterized by synaptic loss and the increase of amyloid β (Aβ) in the brain often detrimentally affecting function. Brainstem is the key central integration site for sensory input from working skeletal muscle. Stimulation of skeletal muscle afferent fibers during muscle contraction increases blood pressure. However, whether AD alters or preserves the central processing of peripheral sensory afferent signals remains to be elucidated. Thus, we tested the hypothesis that the magnitude of the pressor response is functionally altered in intracerebroventricular-streptozotocin injected rats (ICV-STZ). Streptozotocin (3 mg/kg) was intracerebroventricularly injected into the lateral ventricle of male Sprague-Dawley rats. In parallel, a separate group of rats were treated with ICV saline as a vehicle control. Spatial learning and memory function were assessed using the Morris Water Maze behavioral test. Results demonstrate that ICV-STZ rats had a significantly longer time to reach a target platform compared to controls (P = 0.0046). ICV-STZ injection also significantly increased brainstem Aβ1-40 (P = 0.0082), but not Aβ1-42 (P = 0.0744). Further, the peak pressor and cardioaccelerator responses to tibial nerve stimulation were significantly attenuated in ICV-STZ rats compared to controls (ΔMAP: P = 0.0003, ΔHR: P = 0.0035). The findings suggest that the cardiovascular responses to electrical stimulation of sensory afferents are blunted in ICV-STZ rats.
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