Effects of intermittent hypoxia training on leukocyte pyruvate dehydrogenase kinase 1 (PDK-1) mRNA expression and blood insulin level in prediabetes patients
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Abstract
Purpose
Intermittent hypoxia training/treatment (IHT) is an emerging therapeutic approach to alleviate chronic diseases, such as diabetes. The present study investigated the effects of IHT on blood leucocyte pyruvate dehydrogenase kinase 1 (PDK-1) mRNA expression and its relationship with the changes in blood insulin level.
Methods
Seven adult healthy volunteers and 11 prediabetic patients participated in this study. A 3-week course of IHT consisted of a 40-min session of 4 cycles of 5-min 12% O2 and 5-min room air breathing per day, 3 sessions per week for 3 weeks (i.e., total 9 sessions of IHT). Plasma insulin levels and leukocyte PDK-1 mRNA expression were determined at various time points either under fasting condition or following oral glucose tolerance test (OGTT). Correlation between the IHT-induced changes in PDK-1 mRNA and insulin or glucose levels in the same serological samples was analyzed.
Results
At pre-IHT baseline, PDK-1 mRNA expression was two times higher in prediabetes than control subjects. IHT resulted in significant augmentation in PDK-1 mRNA expression (> twofold) in prediabetes at the end of 3-week IHT and remained elevated 1 month after IHT, which was correlated with a significantly reduced insulin release and lower blood glucose after glucose loading with OGTT.
Conclusion
IHT can trigger beneficial effects in normalizing blood insulin levels in prediabetic patients under oral glucose load, which were closely correlated with an enhanced mRNA expression of PDK-1 in leukocytes. Further clinical trials are warranted to validate the utility of IHT as a non-invasive complementary therapy against diabetes-associated pathologies.
Keywords
Hypoxia Insulin Diabetes Pyruvate dehydrogenase kinase Adaptation Gene ExpressionAbbreviations
- ANOVA
Analysis of variance
- GLUT
Glucose transporter
- HIF-1α
Hypoxia inducible factor 1α
- IHT
Intermittent hypoxia training/treatment
- INSR
Insulin receptor
- OGTT
Oral glucose tolerance test
- PDH
Pyruvate dehydrogenase
- PDK
Pyruvate dehydrogenase kinase
- PDK-1
Pyruvate dehydrogenase kinase 1
- R
Correlation coefficient
- SD
Standard Deviation
- TCA
Tricarboxylic acid cycle
Notes
Acknowledgements
The authors like to thank Valentina Chizhova for clinical examination of the subjects and Tetiana I. Drevytska for performing gene expression analysis.
Author contributions
All authors participated in the design and interpretation of the studies, data analysis, review, and final approval of the manuscript. TVS designed the study and wrote the manuscript. TVS, AGP, VIP, EE, IAS, SN, and VBS elaborated the study protocols and performed statistical analyses of the results. LX critically edited and final-assembled the manuscript. VBS provided the enrollment and clinical examination of the subjects as well as general research management.
Compliance with ethical standards
Conflict of interest
LX is a co-founder of Xiamen Innovo Medical Technology Co. Ltd., Xiamen, China and EE is an owner of CellGym Technologies GmbH, Berlin, Germany. All other authors declare no potential conflicts of interest with respect to the research, authorship, and publication of this article.
Ethical approval
The research protocols, patient health information and informed consent forms were approved by the Ethics Committee of Chebotarev Institute of Gerontology, Kiev, Ukraine. This human study was performed in accordance with the ethical standards according to the 1964 Declaration of Helsinki.
Informed consent
Informed consent was obtained from all individual participants included in this study.
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