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Muscular carnosine is a marker for cardiorespiratory fitness and cardiometabolic risk factors in men with type 1 diabetes

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

Muscle is an essential organ for glucose metabolism and can be influenced by metabolic disorders and physical activity. Elevated muscle carnosine levels have been associated with insulin resistance and cardiometabolic risk factors. Little is known about muscle carnosine in type 1 diabetes (T1D) and how it is influenced by physical activity. The aim of this study was to characterize muscle carnosine in vivo by proton magnetic resonance spectroscopy (1H MRS) and evaluate the relationship with physical activity, clinical characteristics and lipoprotein subfractions.

Methods

16 men with T1D (10 athletes/6 sedentary) and 14 controls without diabetes (9/5) were included. Body composition by DXA, cardiorespiratory capacity (VO2peak) and serum lipoprotein profile by proton nuclear magnetic resonance (1H NMR) were obtained. Muscle carnosine scaled to water (carnosineW) and to creatine (carnosineCR), creatine and intramyocellular lipids (IMCL) were quantified in vivo using 1H MRS in a 3T MR scanner in soleus muscle.

Results

Subjects with T1D presented higher carnosine CR levels compared to controls. T1D patients with a lower VO2peak presented higher carnosineCR levels compared to sedentary controls, but both T1D and control groups presented similar levels of carnosineCR at high VO2peak levels. CarnosineW followed the same trend. Integrated correlation networks in T1D demonstrated that carnosineW and carnosineCR were associated with cardiometabolic risk factors including total and abdominal fat, pro-atherogenic lipoproteins (very low-density lipoprotein subfractions), low VO2peak, and IMCL.

Conclusions

Elevated muscle carnosine levels in persons with T1D and their effect on atherogenic lipoproteins can be modulated by physical activity.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Abbreviations

1H MRS:

Proton magnetic resonance spectroscopy (in vivo)

1H NMR:

Proton nuclear magnetic resonance (in vitro)

ANCOVA:

Analysis of covariance

Apo-A1:

Apolipoprotein A1

BMI:

Body mass index

CarnosineCR :

Carnosine scaled to creatine

CarnosineW :

Carnosine scaled to water

DXA:

Dual-energy X-ray absorptiometry

GLUT-4:

Glucose transporter type 4

HDL:

High-density lipoprotein

IMCL:

Intramyocellular lipids

IPAQ:

International physical activity questionnaire

IR:

Insulin resistance

METs:

Metabolic equivalents

MR:

Magnetic resonance

T1D:

Type 1 diabetes

T2D:

Type 2 diabetes

VLDL:

Very low-density lipoprotein

VO2peak:

Maximal oxygen uptake

WHR:

Waist-to-hip ratio

References

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Acknowledgements

This work was supported by the Spanish Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM) and the project 2014_SGR_520 of the Department of Universities, Research and Information Society of the Government of Catalonia. We are grateful to Judith Viaplana for the technical support and for Xavier Tomás and Jaime Isern for the manuscript revision. We are also grateful to the subjects who participated in the study.

Funding

This work was supported by the Spanish Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM) and the project 2014_SGR_520 of the Department of Universities, Research and Information Society of the Government of Catalonia.

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Authors and Affiliations

Authors

Contributions

LB, AIG and AN conceived and designed research. LB, AIG, SM and JP conducted the clinical experiments. MV, MAR, NA and XC conducted the 1H MRS and 1H NMR experiments and analysis. GF, SM and SK contributed with statistical and bioinformatic tools. GF, AIG, SK, and LB analysed data. LB, AIG, JR and AN wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Anna Novials.

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Conflict of interest

Authors declare not conflicts of interest.

Code availability

Not applicable.

Ethics approval

The Research and Ethics Committees of Hospital Clinic de Barcelona approved the experimental protocol (HCB/2009/5268), and the study was performed in accordance with the Declaration of Helsinki.

Consent to participate

Written informed consent was obtained from all subjects prior to participation.

Consent for publication

Not applicable.

Additional information

Communicated by Massimo Pagani.

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Cite this article

Brugnara, L., García, A.I., Murillo, S. et al. Muscular carnosine is a marker for cardiorespiratory fitness and cardiometabolic risk factors in men with type 1 diabetes. Eur J Appl Physiol 122, 1429–1440 (2022). https://doi.org/10.1007/s00421-022-04929-z

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  • DOI: https://doi.org/10.1007/s00421-022-04929-z

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