Zonation of parenchymal and nonparenchymal metabolism in liver
- PMID: 8839925
- DOI: 10.1146/annurev.nu.16.070196.001143
Zonation of parenchymal and nonparenchymal metabolism in liver
Abstract
The enormous number of different liver functions are carried out by parenchymal and four main types of nonparenchymal cells, either alone or in cooperation. Although the liver tissue is uniform on the level of histology, it is heterogenous on the level of morphometry and histochemistry. This heterogeneity is related to the blood supply; cells located in the upstream or periportal zone differ from those in the downstream or perivenous zone in their equipment with key enzymes, translocators, receptors, and subcellular structures and therefore have different functional capacities. This is the basis of the model of metabolic zonation, according to which glucose release from glycogen and via gluconeogenesis, amino acid utilization and ammonia detoxification, protective metabolism, bile formation, and the synthesis of certain plasma proteins such as albumin and fibrinogen occur mainly in the periportal area, whereas glucose utilization, xenobiotic metabolism, and the formation of other plasma proteins such as alpha 1-antitrypsin or alpha-fetoprotein occur predominantly in the perivenous zone. The mor- phologic and functional heterogeneity is the result of zonal differences in the activation of the cellular genome caused by gradients in oxygen, substrate, hormone, and mediator levels, in innervation, as well as in cell-to-cell and cell-to-biomatrix interactions.
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