Human brain glycogen metabolism during and after hypoglycemia.

Published

Journal Article

We tested the hypotheses that human brain glycogen is mobilized during hypoglycemia and its content increases above normal levels ("supercompensates") after hypoglycemia.We utilized in vivo (13)C nuclear magnetic resonance spectroscopy in conjunction with intravenous infusions of [(13)C]glucose in healthy volunteers to measure brain glycogen metabolism during and after euglycemic and hypoglycemic clamps.After an overnight intravenous infusion of 99% enriched [1-(13)C]glucose to prelabel glycogen, the rate of label wash-out from [1-(13)C]glycogen was higher (0.12 +/- 0.05 vs. 0.03 +/- 0.06 micromol x g(-1) x h(-1), means +/- SD, P < 0.02, n = 5) during a 2-h hyperinsulinemic-hypoglycemic clamp (glucose concentration 57.2 +/- 9.7 mg/dl) than during a hyperinsulinemic-euglycemic clamp (95.3 +/- 3.3 mg/dl), indicating mobilization of glucose units from glycogen during moderate hypoglycemia. Five additional healthy volunteers received intravenous 25-50% enriched [1-(13)C]glucose over 22-54 h after undergoing hyperinsulinemic-euglycemic (glucose concentration 92.4 +/- 2.3 mg/dl) and hyperinsulinemic-hypoglycemic (52.9 +/- 4.8 mg/dl) clamps separated by at least 1 month. Levels of newly synthesized glycogen measured from 4 to 80 h were higher after hypoglycemia than after euglycemia (P

Full Text

Duke Authors

Cited Authors

  • Oz, G; Kumar, A; Rao, JP; Kodl, CT; Chow, L; Eberly, LE; Seaquist, ER

Published Date

  • September 2009

Published In

Volume / Issue

  • 58 / 9

Start / End Page

  • 1978 - 1985

PubMed ID

  • 19502412

Pubmed Central ID

  • 19502412

Electronic International Standard Serial Number (EISSN)

  • 1939-327X

International Standard Serial Number (ISSN)

  • 0012-1797

Digital Object Identifier (DOI)

  • 10.2337/db09-0226

Language

  • eng