The elimination of aged glycoproteins by the isolated perfused rat liver

The isolated livers of Sprague-Dawley rats aged ten months were perfused with nine different glycoproteins (coeruloplasmine, haptoglobin, transferrin, α2-mocroglobulin, apolipoprotein A, plasminogen, acid α1-glycoprotein, α1-antitrypsin, β2-glycoprotein), which were suspended in a basic medium free of hemoglobin and other proteins. Besides a control group two other groups were formed to give a model for aging: one group of glycoproteins was desialysed, another was desilysed and incubated with immunoglobulins before the perfusion. In spite of the application of two procedures which are supposed to produce a model of old glycoproteins, neither treatment resulted in the recognition, binding and elimination of the glycoproteins from the perfusion medium.