The splanchnic metabolism of flavonoids highly differed according to the nature of the compound.
The absorption and splanchnic metabolism of different flavonoids (namely quercetin, kaempferol, luteolin, eriodictyol, genistein, and catechin) were investigated in rats after an in situ perfusion of jejunum plus ileum (14 nmol/min). Net transfer across the brush border ranged widely according to the perfused compound (from 78% for kaempferol to 35% for catechin). This variation seems linked to the lipophilicity of a given flavonoid rather than to its three-dimensional structure. Except for catechin, conjugated forms of perfused flavonoids were also detected in the intestinal lumen, but the extent of this secretion depended on the nature of the perfused compounds (52% for quercetin to 11% for genistein). For some of the perfused aglycones, biliary secretion was an important excretion route: 30% of the perfused dose for genistein but only 1% for catechin. Thus the splanchnic metabolism of flavonoid is controlled by several factors: 1) the efficiency of their transfer through the brush border, 2) the intensity of the intestinal secretion of conjugates toward the mucosal and serosal sides, respectively, and 3) the biliary secretion of conjugates. These data suggested that the splanchnic metabolism of perfused flavonoids depends on the nature of the compound considered, which in turn influences their availability for peripheral tissues.
Laboratoire des Maladies Métaboliques et des Micronutriments, Institut National de la Recherche Agronomique Centre de Recherche de Clermont-Ferrand/Theix, 63122 Saint Genès-Champanelle, France.
Vanessa
V
Crespy
Christine
C
Morand
Catherine
C
Besson
Nicole
N
Cotelle
Hervé
H
Vézin
Christian
C
Demigné
Christian
C
Rémésy
D000818:Animals; D001652:Bile Ducts / Q000378:metabolism; D005260:Female; D005419:Flavonoids / Q000378:metabolism*; D007082:Ileum / Q000378:metabolism*; D007408:Intestinal Absorption; D007583:Jejunum / Q000378:metabolism*; D008297:Male; D008871:Microvilli / Q000378:metabolism; D008958:Models, Molecular; D015394:Molecular Structure; D010477:Perfusion; D051381:Rats
D005419:Flavonoids