Tissue and cell surface proteins modified nonenzymatically by glucose are shown to be removed by macrophages through a recently characterized high affinity receptor. Insulin appears to be a potent suppressor of this macrophage AGE removal activity, while TNF acts as a stimulant. Coupling of AGE-proteins to their AGE-receptor results in TNF and IL-1 synthesis and secretion. This suggests that AGE may act as a signal for growth-promoting factor secretion in a coordinated replacement process during tissue remodeling. A greater than 2-fold decrease in receptor number and binding capacity found in cells from aged mice as compared to young suggests that aging may adversely affect the AGE-receptor-efficiency and by impeding crosslinked AGE-protein removal add to ongoing aging tissue damage.
|Original language||English (US)|
|Number of pages||14|
|Journal||Progress in clinical and biological research|
|State||Published - 1989|
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