Relationships between plasma isotope enrichments of leucine and alpha-ketoisocaproic acid during continuous infusion of labelled leucine.

Abstract:

:The ratio at steady-state of alpha-ketoisocaproic acid (KIC) to leucine 13C enrichments in plasma during continuous infusion of [13C]leucine was examined in 58 studies under a variety of conditions. The ratio was lower (P less than 0.001) in 'arterialized' venous plasma (mean +/- SD 0.85 +/- 0.09) than in deep venous plasma (0.95 +/- 0.08), the sampling site enrichment differences being greater for leucine than for KIC. Variation in the ratio between the various conditions studied was largely explained by analytical variation. Three normal subjects were given an intravenous bolus dose of L-[1-13C, 15N]leucine. Both [13C]KIC and [13C]leucine appeared quantitatively in plasma within 10 min, indicating that both transamination of leucine and KIC, and their equilibration between intracellular fluid and plasma, is rapid. This study suggests that changes in sampling site, rather than in study conditions, are more likely to lead to variation in the KIC:leucine enrichment ratio. The lesser variation for KIC, and the rapid equilibration of the [13C]leucine bolus, favour KIC as tracee for [13C]leucine protein turnover studies.

journal_name

Eur J Clin Invest

authors

Thompson GN,Pacy PJ,Ford GC,Merritt H,Halliday D

doi

10.1111/j.1365-2362.1988.tb01280.x

subject

Has Abstract

pub_date

1988-12-01 00:00:00

pages

639-43

issue

6

eissn

0014-2972

issn

1365-2362

journal_volume

18

pub_type

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