TABLE 5.
Dietary proline | Dietary glutamine | |
---|---|---|
Dietary tracer recovery, μmol tracer·kg−1·h−1 | ||
Citrulline | 6.7 ± 0.49 | 1.2 ± 0.07* |
Ornithine | 7.4 ± 0.53 | ND2 |
Dietary tracer recovery, % of tracer infused | ||
Citrulline | 2.9 ± 0.22 | 0.6 ± 0.04* |
Ornithine | 3.2 ± 0.22 | ND |
Dietary contribution, μmol·kg−1·h−1 | ||
Citrulline | 22.2 ± 1.64 | 4.0 ± 0.23* |
Ornithine | 24.7 ± 1.76 | ND |
Dietary contribution, % of Ra | ||
Citrulline | 14.4 ± 0.52 | 2.9 ± 0.12* |
Ornithine | 16.5 ± 1.00 | ND |
Labeled plasma Orn (from dietary tracer) to Cit, μmol tracer·kg−1·h−1 | 1.56 ± 0.14 | ND |
Plasma citrulline enrichments, mpe | ||
Due to Orn tracer | 1.00 ± 0.05 | ND |
Measured Cit enrichment | 4.32 ± 0.17 | 0.87 ± 0.04* |
Dietary precursor utilization for the synthesis of citrulline, % | ||
At the site of Cit synthesis | 23.1 ± 0.56 | ND |
At the site of Cit synthesis | 76.9 ± 0.56 | 100.0* |
Dietary precursor utilization for the synthesis of citrulline, μmol·kg−1·h−1 | ||
Through plasma ornithine | 5.2 ± 0.45 | ND |
At the site of Cit synthesis | 17.0 ± 1.20 | 4.0 ± 0.23* |
Values are means ± SEM, n = 10. *Different from proline, P < 0.001.
ND, not detectable