Chronic Beta-adrenergic Stimulation
Chronic Beta-adrenergic Stimulation - Related Videos
02:00
Vagus Nerve Stimulation via Chronically Implanted Peripheral Nerve Cuff Electrodes in Rats
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2025
Source: Sanchez, C. A., et al. Preparation of Peripheral Nerve Stimulation Electrodes for Chronic Implantation in Rats. J. Vis. Exp. (2020).This video demonstrates vagus nerve stimulation in an awake rat. A rat with an implanted chronic peripheral nerve cuff electrode and trained in a lever press task is connected to a stimulus generator via an implanted head cap. The vagus nerve is stimulated immediately after each successful lever press, resulting in the expansion of the motor map.
02:20
Modulation of Chronic Pain Using Multicolumn Paddle Lead Spinal Cord Stimulation
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2025
Source: Remacle, T., et al. Treating Low Back Pain in Failed Back Surgery Patients with Multicolumn-lead Spinal Cord Stimulation. J. Vis. Exp. (2018)This video demonstrates the method of using multicolumn paddle lead spinal cord stimulation to manage chronic lower back pain in Failed back surgery syndrome (FBSS) patients. The pre-implanted lead delivers targeted electrical pulses that activate non-painful sensory pathways, interrupting pain signals and reducing pain perception.
11:24
Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Cited by 3 •
2015
A protocol to evaluate changes in DNA damage levels and DNA repair capacity that may be induced by chronic in vivo low dose irradiation in mouse spleen lymphocytes, by measuring phosphorylated histone H2AX, a marker of DNA double-strand breaks, using flow cytometry is presented.
10:15
Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Cited by 16 •
2013
We explore the use of repetitive transcranial magnetic stimulation (rTMS) to improve language abilities in patients with chronic stroke and non-fluent aphasia. After identifying a site in the right frontal gyrus for each patient that responds optimally to stimulation, we target this site during ten days of rTMS treatment.
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Cardiac Response to β-Adrenergic Stimulation Determined by Pressure-Volume Loop Analysis
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2021
Here we describe a cardiac pressure-volume loop analysis under increasing doses of intravenously infused isoproterenol to determine the intrinsic cardiac function and the β-adrenergic reserve in mice. We use a modified open-chest approach for the pressure-volume loop measurements, in which we include ventilation with positive end-expiratory pressure.
FAQs
Chronic activation maintains signaling beyond a transient response. Beta-adrenergic receptors couple to Gs proteins, which stimulate adenylyl cyclase, raise cyclic AMP, and activate protein kinase A. With continued receptor engagement, this signaling environment is accompanied by receptor phosphorylation, beta-arrestin recruitment, desensitization, and internalization. The response can therefore shift from initial activation toward reduced signaling effectiveness.
These processes help explain why sustained receptor activation does not produce the same response indefinitely. Receptor phosphorylation and beta-arrestin recruitment are associated with desensitization, meaning the receptor becomes less responsive, and internalization, meaning it is removed from the cell surface. Together, they can alter treatment responses and limit the persistence of beta-adrenergic signaling.
A short-lived response primarily reflects receptor coupling through Gs proteins and activation of the cyclic AMP and protein kinase A pathway. Prolonged stimulation adds regulatory changes that reshape receptor responsiveness, including phosphorylation, beta-arrestin recruitment, desensitization, and internalization. This distinction matters because persistent sympathetic activity can influence disease processes and organ function differently from a brief signal.
Both endogenous catecholamines and beta-agonist drugs can provide the prolonged receptor activation that drives this process. Their clinical contexts differ, however: endogenous catecholamines reflect persistent sympathetic activity, whereas beta-agonists are used therapeutically. Studying both sources helps connect receptor-level regulation with disease-related signaling, treatment responses, and the development of tolerance during ongoing drug exposure.
Persistent beta-adrenergic signaling is relevant to cardiac dysfunction because sustained sympathetic activity can alter cardiac function and contribute to maladaptive remodeling. Receptor desensitization and internalization may also change how cardiac tissue responds to continued stimulation. Examining these linked effects helps medicine interpret the consequences of prolonged sympathetic drive rather than focusing only on the initial signaling response.
The effects extend beyond the heart. Chronic beta-adrenergic stimulation is studied in relation to vascular and metabolic responses, where prolonged receptor signaling may alter organ function and contribute to broader physiological consequences. Considering these systems together is important because persistent beta-adrenergic activity can produce treatment-relevant effects across multiple organs rather than acting as an isolated cardiac phenomenon.
Repeated or prolonged beta-agonist exposure can engage the same regulatory processes that accompany sustained receptor activation, including phosphorylation, beta-arrestin recruitment, desensitization, and internalization. These changes provide a mechanistic basis for altered responses to bronchodilator therapy over time. In medicine, this connection helps researchers evaluate how treatment can retain beneficial signaling while limiting reduced responsiveness and maladaptive effects.