Document Detail

Moderate exercise promotes human RBC-NOS activity, NO production and deformability through Akt kinase pathway.
MedLine Citation:
PMID:  23049912     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Nitric oxide (NO) produced by nitric oxide synthase (NOS) in human red blood cells (RBCs) was shown to depend on shear stress and to exhibit important biological functions, such as inhibition of platelet activation. In the present study we hypothesized that exercise-induced shear stress stimulates RBC-NOS activation pathways, NO signaling, and deformability of human RBCs.
METHODS/FINDINGS: Fifteen male subjects conducted an exercise test with venous blood sampling before and after running on a treadmill for 1 hour. Immunohistochemical staining as well as western blot analysis were used to determine phosphorylation and thus activation of Akt kinase and RBC-NOS as well as accumulation of cyclic guanylyl monophosphate (cGMP) induced by the intervention. The data revealed that activation of NO upstream located enzyme Akt kinase was significantly increased after the test. Phosphorylation of RBC-NOSSer(1177) was also significantly increased after exercise, indicating activation of RBC-NOS through Akt kinase. Total detectable RBC-NOS content and phosphorylation of RBC-NOSThr(495) were not affected by the intervention. NO production by RBCs, determined by DAF fluorometry, and RBC deformability, measured via laser-assisted-optical-rotational red cell analyzer, were also significantly increased after the exercise test. The content of the NO downstream signaling molecule cGMP increased after the test. Pharmacological inhibition of phosphatidylinositol 3 (PI3)-kinase/Akt kinase pathway led to a decrease in RBC-NOS activation, NO production and RBC deformability.
CONCLUSION/SIGNIFICANCE: This human in vivo study first-time provides strong evidence that exercise-induced shear stress stimuli activate RBC-NOS via the PI3-kinase/Akt kinase pathway. Actively RBC-NOS-produced NO in human RBCs is critical to maintain RBC deformability. Our data gain insights into human RBC-NOS regulation by exercise and, therefore, will stimulate new therapeutic exercise-based approaches for patients with microvascular disorders.
Frank Suhr; Julian Brenig; Rebecca Müller; Hilke Behrens; Wilhelm Bloch; Marijke Grau
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-25
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-10-10     Completed Date:  2013-05-07     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e45982     Citation Subset:  IM    
Department of Molecular and Cellular Sports Medicine, German Sport University Cologne, Cologne, Germany.
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MeSH Terms
Anthropometry / methods
Blood Gas Analysis
Erythrocytes / metabolism*
Gene Expression Regulation, Enzymologic*
Immunohistochemistry / methods
Nitric Oxide / chemistry*
Nitric Oxide Synthase / metabolism*
Phosphatidylinositol 3-Kinases / metabolism
Proto-Oncogene Proteins c-akt / metabolism*
Shear Strength
Signal Transduction
Stress, Mechanical
Reg. No./Substance:
10102-43-9/Nitric Oxide; EC Oxide Synthase; EC 2.7.1.-/Phosphatidylinositol 3-Kinases; EC Proteins c-akt

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