Muscle contraction induced arterial shear stress increases endothelial nitric oxide synthase phosphorylation in humans

We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser 1177 , the primary activation site on eNOS, in endothelial cells (ECs) of humans. Sev...

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Published inAmerican journal of physiology. Heart and circulatory physiology Vol. 313; no. 4; pp. H854 - H859
Main Authors Casey, Darren P., Ueda, Kenichi, Wegman-Points, Lauren, Pierce, Gary L.
Format Journal Article
LanguageEnglish
Published United States American Physiological Society 01.10.2017
SeriesIntegrative Cardiovascular Physiology and Pathophysiology
Subjects
Adult
Arteries - enzymology
Arteries - physiology
Brachial Artery - physiology
Endothelial cells
Exercise - physiology
Forearm
Forearm - physiology
Humans
Immunofluorescence
Male
Mechanical stimuli
Medical instruments
Muscle contraction
Muscle Contraction - physiology
Muscles
Muscular system
Nitric oxide
Nitric Oxide Synthase Type III - metabolism
Nitric-oxide synthase
Phosphorylation
Rapid Report
Regional Blood Flow - physiology
Rhythms
Shear rate
Shear stress
Stress, Physiological
Veins & arteries
Young Adult
endothelial nitric oxide synthase
exercise
shear stress
phosphorylation
Online AccessGet full text
ISSN0363-6135
1522-1539
1522-1539
DOI10.1152/ajpheart.00282.2017

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Abstract We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser 1177 , the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser 1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol ( P < 0.001). p-eNOS Ser 1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group ( P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser 1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans. NEW & NOTEWORTHY Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser 1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.
AbstractList Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser 1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells. We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser 1177 , the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser 1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol ( P < 0.001). p-eNOS Ser 1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group ( P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser 1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans. NEW & NOTEWORTHY Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser 1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.
We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser , the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol ( < 0.001). p-eNOS Ser expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group ( > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans. Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.
We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser1177, the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol (P < 0.001). p-eNOS Ser1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group (P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans.
We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser 1177 , the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser 1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol ( P < 0.001). p-eNOS Ser 1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group ( P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser 1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans. NEW & NOTEWORTHY Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser 1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.
We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser1177, the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol (P < 0.001). p-eNOS Ser1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group (P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans.NEW & NOTEWORTHY Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric oxide synthase (eNOS) and/or phosphorylated (p-)eNOS at Ser1177, the primary activation site on eNOS, in endothelial cells (ECs) of humans. Seven young male subjects (25 ± 1 yr) performed 20 separate bouts (3 min each) of rhythmic forearm exercise at 20% of maximum over a 2-h period. Each bout of exercise was separated by 3 min of rest. An additional six male subjects (24 ± 1 yr) served as time controls (no exercise). ECs were freshly isolated from the brachial artery using sterile J-wires through an arterial catheter at baseline and again after the 2-h exercise or time control period. Expression of eNOS or p-eNOS Ser1177 in ECs was determined via immunofluorescence. Brachial artery mean shear rate was elevated compared with baseline and the time control group throughout the 2-h exercise protocol (P < 0.001). p-eNOS Ser1177 expression was increased 57% in ECs in the exercise group [0.06 ± 0.01 vs. 0.10 ± 0.02 arbitrary units (au), P = 0.02] but not in the time control group (0.08 ± 0.01 vs. 0.07 ± 0.01 au, P = 0.72). In contrast, total eNOS expression did not change in either the exercise (0.13 ± 0.04 vs. 0.12 ± 0.03 au) or time control (0.12 ± 0.03 vs. 0.11 ± 0.03 au) group (P > 0.05 for both). Our novel results suggest that elevations in brachial artery shear increase eNOS Ser1177 phosphorylation in the absence of changes in total eNOS in ECs of young healthy male subjects, suggesting that this model is sufficient to alter posttranslational modification of eNOS activity in vivo in humans.NEW & NOTEWORTHY Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser1177 phosphorylation in brachial artery endothelial cells of healthy humans. Our present study provides the first evidence in humans that muscle contraction-induced increases in conduit arterial shear lead to in vivo posttranslational modification of endothelial nitric oxide synthase activity in endothelial cells.
Author Ueda, Kenichi
Wegman-Points, Lauren
Casey, Darren P.
Pierce, Gary L.
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  organization: Department of Physical Therapy and Rehabilitation Science, University of Iowa, Iowa City, Iowa;, Abboud Cardiovascular Research Center, University of Iowa, Iowa City, Iowa;, Fraternal Order of Eagles Diabetes Research, University of Iowa, Iowa City, Iowa; and
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shear stress
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Snippet We determined if local increases in brachial artery shear during repetitive muscle contractions induce changes in protein expression of endothelial nitric...
Elevations in brachial artery shear in response to forearm exercise increased endothelial nitric oxide synthase Ser 1177 phosphorylation in brachial artery...
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StartPage H854
SubjectTerms Adult
Arteries - enzymology
Arteries - physiology
Brachial Artery - physiology
Endothelial cells
Exercise - physiology
Forearm
Forearm - physiology
Humans
Immunofluorescence
Male
Mechanical stimuli
Medical instruments
Muscle contraction
Muscle Contraction - physiology
Muscles
Muscular system
Nitric oxide
Nitric Oxide Synthase Type III - metabolism
Nitric-oxide synthase
Phosphorylation
Rapid Report
Regional Blood Flow - physiology
Rhythms
Shear rate
Shear stress
Stress, Physiological
Veins & arteries
Young Adult
Title Muscle contraction induced arterial shear stress increases endothelial nitric oxide synthase phosphorylation in humans
URI https://www.ncbi.nlm.nih.gov/pubmed/28801524
https://www.proquest.com/docview/1970169504
https://www.proquest.com/docview/1928515478
https://pubmed.ncbi.nlm.nih.gov/PMC5668602
Volume 313
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