Abstract
Object
The objective of this study was to determine the effects of a standardized fat rich meal and subsequent exercise on liver fat content by 1H MRS and on liver adenosine triphosphate (ATP) content by 31P MRS in healthy subjects.
Materials and methods
Hepatic 1H and proton decoupled 31P MRS were performed on nine healthy subjects on a clinical 3.0 T MR imager three times during a day: after (1) an overnight fast, (2) a following standardized fat rich meal and (3) a subsequent exercise session. Blood parameters were followed during the day to serve as a reference to MRS.
Results
Liver fat content increased gradually over the day (p = 0.0001) with an overall increase of 30 %. Also γ-NTP changed significantly over the day (p = 0.005). γ-NTP/tP decreased by 9 % (p = 0.019, post hoc) from the postprandial to the post-exercise state.
Conclusion
Our study shows that in vivo MRS can depict short lived physiological changes; entering of fat into liver cells and consumption of ATP during exercise can be measured non-invasively in healthy subjects. The physiological state may have an impact on fat and energy metabolite levels. Hepatic 1H and 31P MRS studies should be performed under standardized conditions.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ASH:
-
Alcoholic steatohepatitis
- ATP:
-
Adenosine triphosphate
- FFA:
-
Free fatty acids
- FID:
-
Free induction decay
- GPC:
-
Glycerophosphocholine
- GPE:
-
Glycerophosphoethanolamine
- GTP:
-
Guanosine triphosphate
- HCT:
-
Hematocrit
- HDL-C:
-
High-density lipoprotein cholesterol
- IHCL:
-
Intra hepatocellular lipids
- ISIS:
-
Image selective in vivo spectroscopy
- LDL-C:
-
Low-density lipoprotein cholesterol
- MCH:
-
Mean corpuscular hemoglobin
- MCHC:
-
Mean corpuscular hemoglobin concentration
- MRS:
-
Magnetic resonance spectroscopy
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- NTP:
-
Nucleoside triphosphate
- PC:
-
Phosphocholine
- PDE:
-
Phosphodiesters
- PE:
-
Phosphoethanolamine
- PEP:
-
Phosphoenolpyruvate
- Pi:
-
Inorganic phosphates
- PME:
-
Phosphomonoesters
- PtdC:
-
Phosphatidylcholine
- RDW:
-
Red blood cell distribution width
- SNR:
-
Signal-to-noise ratio
- T2DM:
-
Type 2 diabetes mellitus
- TG:
-
Triglycerides
- tP:
-
Total phosphorus
- WBC:
-
White blood cells
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Acknowledgments
We are grateful to Helinä Perttunen-Nio for excellent laboratory work and to volunteers for participation. This study was funded by the Waldemar von Frenckells Foundation, the Finnish Diabetes Association, the Orion-Pharmos Foundation, Mary and Georg C. Ehrnrooths foundation and Helsinki University Central Hospital: a special governmental subsidy for health sciences research (TLD8100061 and TLD8100073).
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Hakkarainen, A., Lundbom, J., Tuominen, E.K. et al. Measuring short-term liver metabolism non-invasively: postprandial and post-exercise 1H and 31P MR spectroscopy. Magn Reson Mater Phy 28, 57–66 (2015). https://doi.org/10.1007/s10334-014-0450-7
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DOI: https://doi.org/10.1007/s10334-014-0450-7