Dm. Minich et al., Intestinal absorption and postabsorptive metabolism of linoleic acid in rats with short-term bile duct ligation, AM J P-GAST, 279(6), 2000, pp. G1242-G1248
Citations number
26
Categorie Soggetti
da verificare
Journal title
AMERICAN JOURNAL OF PHYSIOLOGY-GASTROINTESTINAL AND LIVER PHYSIOLOGY
We investigated in bile duct-ligated (BDL) and sham-operated control rats w
hether the frequent presence of essential fatty acid deficiency in cholesta
tic liver disease could be related to linoleic acid malabsorption, altered
linoleic acid metabolism, or both. In plasma of BDL rats, the triene-to-tet
raene ratio, a biochemical marker for essential fatty acid deficiency, was
increased compared with controls (0.024 +/- 0.004 vs. 0.013 +/- 0.001; P <
0.05). Net and percentage of dietary linoleic acid absorbed were decreased
in BDL rats compared with control rats (1.50 +/- 0.16 mmol/day and 81.3 +/-
3.3% vs. 2.08 +/- 0.07 mmol/day and 99.2 +/- 0.1%, respectively; each P <
0.001). At 24 h after [C-13] linoleic acid administration, BDL rats had a s
imilar ratio of plasma [C-13] arachidonic acid to plasma [ 13C] linoleic ac
id concentration compared with control rats. Delta (6)-Desaturase activity
was not significantly different in hepatic microsomes from control or BDL r
ats. At 3 h after [C-13] linoleic acid administration, plasma appearance of
[C-13] linoleic acid and cumulative expiration of (CO2)-C-13 were decrease
d in BDL rats, compared with controls (by 54% and 80%, respectively). The p
resent data indicate that the impaired linoleic acid status in cholestatic
liver disease is mainly due to decreased net absorption and not to quantita
tive alterations in postabsorptive metabolism.