Abstract：
:When liver cells from either normal or hereditarily diabetic rats are exposed to (13)C-enriched D-fructose (10 mM) and unlabelled D-glucose (also 10 mM) in the presence of D(2)O, the output of (13)C-enriched D-glucose generated from D-[1-(13)C]fructose is significantly lower than that from D-[2-(13)C]fructose. This coincides with a higher generation of (13)C-enriched L-lactate and L-alanine from D-[1-(13)C]fructose, as compared to D-[2-(13)C]fructose. In absolute terms, the mean paired difference in the output of (13)C-enriched D-glucose generated from D-[1-(13)C]fructose versus D-[2-(13)C]fructose is not significantly different from the mean paired difference in the production of (13)C-enriched L-lactate and L-alanine from the same precursors, with an overall mean value of 7.01 +/- 1.59 micromol (n = 8; P < 0.005). It is proposed that these findings indicate isotopic discrimination at the phosphoglucoisomerase level between (12)C and (13)C for the carbon atom in position 1 (as compared to that in position 2) of D-fructose 6-phosphate.
journal_name
Biochimiejournal_title
Biochimieauthors
Malaisse WJ,Willem Rdoi
10.1016/j.biochi.2003.12.005keywords:
subject
Has Abstractpub_date
2004-02-01 00:00:00pages
119-25issue
2eissn
0300-9084issn
1638-6183pii
S0300908404000045journal_volume
86pub_type
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