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Am J Physiol Gastrointest Liver Physiol 277: G725-G730, 1999;
0193-1857/99 $5.00
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Vol. 277, Issue 3, G725-G730, September 1999

Carbon monoxide disposition in the perfused rat liver

David G. le Couteur1,2,3, Zhan Li Yin1, Laurent P. Rivory2, and Allan J. McLean1,3,4

1 Canberra Clinical School of the Sydney University, The Canberra Hospital, Garran, Australian Capital Territory 2605; 2 Department of Pharmacology and 3 Department of Medicine, The University of Sydney, Sydney, New South Wales 2006; and 4 John Curtin School of Medical Research, Australian National University, Canberra, Australian Capital Territory 2602, Australia

A simple method for determining carbon monoxide (CO) disposition in the rat liver perfused with erythrocyte-free buffer was developed. Wash-in experiments were performed with buffer containing tracer quantities of [14C]sucrose and 3H2O and equilibrated with CO. Outflow samples were collected into tubes containing human erythrocytes, which avidly bind CO. Outflow curves were analyzed using compartmental models. Fractional recovery of CO was 1.07 ± 0.17, and the apparent volume of distribution was 1.37 ± 0.30 ml/g of liver (n = 8). A flow-limited model fitted the data most effectively, although estimates of the permeability-to-surface area product were attempted using a barrier-limited model. This technique will facilitate investigation of the effects of disease on gaseous substrate disposition in perfused organs.

compartmental analysis; permeability-to-surface area ratio


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