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Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats

Previously, we reported that cervical vagal nerve stimulation (VNS) increases blood glucose levels and inhibits insulin secretion in anesthetized rats through afferent signaling. Since afferent signaling is also thought to mediate the therapeutic effects of VNS in patients with therapy‐refractory ep...

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Autores principales: Stauss, Harald M., Stangl, Hubert, Clark, Karen C., Kwitek, Anne E., Lira, Vitor A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6300710/
https://www.ncbi.nlm.nih.gov/pubmed/30569658
http://dx.doi.org/10.14814/phy2.13953
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author Stauss, Harald M.
Stangl, Hubert
Clark, Karen C.
Kwitek, Anne E.
Lira, Vitor A.
author_facet Stauss, Harald M.
Stangl, Hubert
Clark, Karen C.
Kwitek, Anne E.
Lira, Vitor A.
author_sort Stauss, Harald M.
collection PubMed
description Previously, we reported that cervical vagal nerve stimulation (VNS) increases blood glucose levels and inhibits insulin secretion in anesthetized rats through afferent signaling. Since afferent signaling is also thought to mediate the therapeutic effects of VNS in patients with therapy‐refractory epilepsy and major depression, the question arises if patients treated with VNS develop impaired glucose tolerance. Thus, we hypothesized that cervical VNS impairs glucose tolerance in conscious rats. Rats (n = 7) were instrumented with telemetric blood pressure sensors and right‐ or left‐sided cervical vagal nerve stimulators (3 V, 5 Hz, 1 msec pulse duration, 1 h on 1 h off). Glucose tolerance tests (GTTs, 1.5 g dextrose/kg BW, i.p.) were performed after overnight fasting with the stimulators on or off (sham stimulation) in randomized order separated by 3–4 days. Overnight VNS did not alter mean levels of blood pressure or heart rate, but increased fasted blood glucose levels (140 ± 13 mg/dL vs. 109 ± 8 mg/dL, P < 0.05). The area under the blood glucose concentration curves of the GTTs was larger during VNS than sham stimulation (3499 ± 211 mg/dL*h vs. 1810 ± 234 mg/dL*h, P < 0.05). One hour into the GTTs, the serum insulin concentrations had decreased during VNS (−0.57 ± 0.25 ng/mL, P < 0.05) and increased during sham stimulation (+0.71 ± 0.15 ng/mL, P < 0.05) compared to the fasted baseline levels. These results demonstrate that chronic cervical VNS elevates fasted blood glucose levels and impairs glucose tolerance likely through inhibition of glucose‐induced insulin release in conscious rats. It remains to be determined if patients treated with VNS are at greater risk of developing glucose intolerance and type 2 diabetes.
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spelling pubmed-63007102019-01-02 Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats Stauss, Harald M. Stangl, Hubert Clark, Karen C. Kwitek, Anne E. Lira, Vitor A. Physiol Rep Original Research Previously, we reported that cervical vagal nerve stimulation (VNS) increases blood glucose levels and inhibits insulin secretion in anesthetized rats through afferent signaling. Since afferent signaling is also thought to mediate the therapeutic effects of VNS in patients with therapy‐refractory epilepsy and major depression, the question arises if patients treated with VNS develop impaired glucose tolerance. Thus, we hypothesized that cervical VNS impairs glucose tolerance in conscious rats. Rats (n = 7) were instrumented with telemetric blood pressure sensors and right‐ or left‐sided cervical vagal nerve stimulators (3 V, 5 Hz, 1 msec pulse duration, 1 h on 1 h off). Glucose tolerance tests (GTTs, 1.5 g dextrose/kg BW, i.p.) were performed after overnight fasting with the stimulators on or off (sham stimulation) in randomized order separated by 3–4 days. Overnight VNS did not alter mean levels of blood pressure or heart rate, but increased fasted blood glucose levels (140 ± 13 mg/dL vs. 109 ± 8 mg/dL, P < 0.05). The area under the blood glucose concentration curves of the GTTs was larger during VNS than sham stimulation (3499 ± 211 mg/dL*h vs. 1810 ± 234 mg/dL*h, P < 0.05). One hour into the GTTs, the serum insulin concentrations had decreased during VNS (−0.57 ± 0.25 ng/mL, P < 0.05) and increased during sham stimulation (+0.71 ± 0.15 ng/mL, P < 0.05) compared to the fasted baseline levels. These results demonstrate that chronic cervical VNS elevates fasted blood glucose levels and impairs glucose tolerance likely through inhibition of glucose‐induced insulin release in conscious rats. It remains to be determined if patients treated with VNS are at greater risk of developing glucose intolerance and type 2 diabetes. John Wiley and Sons Inc. 2018-12-19 /pmc/articles/PMC6300710/ /pubmed/30569658 http://dx.doi.org/10.14814/phy2.13953 Text en © 2018 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Stauss, Harald M.
Stangl, Hubert
Clark, Karen C.
Kwitek, Anne E.
Lira, Vitor A.
Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title_full Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title_fullStr Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title_full_unstemmed Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title_short Cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
title_sort cervical vagal nerve stimulation impairs glucose tolerance and suppresses insulin release in conscious rats
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6300710/
https://www.ncbi.nlm.nih.gov/pubmed/30569658
http://dx.doi.org/10.14814/phy2.13953
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