Contrasting effects of afferent and efferent vagal nerve stimulation on insulin secretion and blood glucose regulation
Autor: | Erin E. Meyers, Kamal Rahmouni, Ana Kronemberger, Harald M. Stauss, Vitor A. Lira |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Blood Glucose Male medicine.medical_specialty Vagus Nerve Stimulation Physiology medicine.medical_treatment Efferent Stimulation Autonomic Nervous System Glucagon Efferent Pathways Rats Sprague-Dawley 03 medical and health sciences Parasympathetic nervous system 0302 clinical medicine Parasympathetic Nervous System Physiology (medical) Internal medicine Insulin Secretion Metabolism and Regulation heart rate Medicine Animals Insulin Efferent Pathway Original Research Afferent Pathways diabetes business.industry Vagus Nerve 3. Good health Vagus nerve Rats 030104 developmental biology Endocrinology medicine.anatomical_structure Blood pressure Endocrine and Metabolic Conditons Disorders and Treatments business 030217 neurology & neurosurgery Vagus nerve stimulation |
Zdroj: | Physiological Reports |
ISSN: | 2051-817X |
Popis: | Parasympathetic activation reduces hepatic glucose release and increases pancreatic insulin secretion in hyperglycemic conditions. Thus, vagal nerve stimulation (VNS) may potentially be effective in treating type II diabetes. To investigate this possibility, we hypothesized that VNS reduces blood glucose concentration [Glu] via insulin secretion. [Glu] together with insulin and glucagon serum concentrations were determined in anesthetized rats during baseline conditions and 120 min of cervical VNS with the nerve left intact for combined afferent and efferent VNS (n = 9) or the nerve sectioned proximal or distal from the stimulation electrode for selective efferent (n = 8) or afferent (n = 7) VNS, respectively. Afferent VNS caused a strong and sustained increase in [Glu] (+108.9 ± 20.9% or +77.6 ± 15.4%, after 120 min of combined afferent and efferent VNS or selective afferent VNS) that was not accompanied by an increase in serum insulin concentration. However, serum insulin levels increased significantly with selective efferent VNS (+71.2 ± 27.0% after 120 min of VNS) that increased [Glu] only temporarily (+28.8 ± 11.7% at 30 min of VNS). Efferent VNS initially increased serum glucagon concentration which remained elevated for 120 min when efferent VNS was combined with afferent VNS, but returned to baseline with selective efferent VNS. These findings demonstrate that afferent VNS causes a marked and sustained increase in [Glu] that is partly mediated by suppression of pancreatic insulin secretion. In contrast, efferent VNS stimulates pancreatic glucagon secretion that appears to be antagonized by insulin secretion in the case of selective efferent VNS. Selective efferent VNS may potentially be effective in treating type II diabetes. |
Databáze: | OpenAIRE |
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