期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 37, 期 8, 页码 2883-2893出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0271678X16678240
关键词
C-13 magnetic resonance spectroscopy; biophysical modeling; glycogen; hypoglycemia-associated autonomic failure; supercompensation
资金
- National Institute of Neurological Disorders and Stroke (NINDS) [R01 N5035192]
- National Institute of Biomedical Imaging and Bioengineering (NIBIB) [P41 EB015894]
- Institutional Center Cores for Advanced Neuroimaging [P30 NS076408]
- National Center for Research Resources (NCRR) [S10 RR023730, S10 RR027290]
- European Union [701635]
- CTSA [5KL2TR000113]
- National Center for Advancing Translational Sciences of the National Institutes of Health [UL1TR000114]
- Marie Curie Actions (MSCA) [701635] Funding Source: Marie Curie Actions (MSCA)
Supercompensated brain glycogen levels may contribute to the development of hypoglycemia-associated autonomic failure (HAAF) following recurrent hypoglycemia (RH) by providing energy for the brain during subsequent periods of hypoglycemia. To assess the role of glycogen supercompensation in the generation of HAAF, we estimated the level of brain glycogen following RH and acute hypoglycemia (AH). After undergoing 3 hyperinsulinemic, euglycemic and 3 hyperinsulinemic, hypoglycemic clamps (RH) on separate occasions at least 1 month apart, five healthy volunteers received [1-C-13] glucose intravenously over 80+ h while maintaining euglycemia. C-13-glycogen levels in the occipital lobe were measured by C-13 magnetic resonance spectroscopy at similar to 8, 20, 32, 44, 56, 68 and 80 h at 4 T and glycogen levels estimated by fitting the data with a biophysical model that takes into account the tiered glycogen structure. Similarly, prior C-13-glycogen data obtained following a single hypoglycemic episode (AH) were fitted with the same model. Glycogen levels did not significantly increase after RH relative to after euglycemia, while they increased by similar to 16% after AH relative to after euglycemia. These data suggest that glycogen supercompensation may be blunted with repeated hypoglycemic episodes. A causal relationship between glycogen supercompensation and generation of HAAF remains to be established.
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