GONUTS has been updated to MW1.31 Most things seem to be working but be sure to report problems.

Have any questions? Please email us at ecoliwiki@gmail.com

PMID:4005043

From GONUTS
Jump to: navigation, search
Citation

Chatzipanagiotou, S, Nath, A, Vogt, B and Jungermann, K (1985) Alteration in the capacities as well as in the zonal and cellular distributions of pyruvate kinase L and M2 in regenerating rat liver. Biol. Chem. Hoppe-Seyler 366:271-80

Abstract

Pyruvate kinase L (PKL), the glucoregulatory isoenzyme of adult parenchymal cells, and M2 (PKM2), the isoenzyme of proliferating and non-parenchymal cells, were measured, using a specific anti-PKL antibody for differentiation, in total liver homogenates, in isolated parenchymal and non-parenchymal cells as well as in microdissected periportal and perivenous liver tissue from regenerating rat liver after two-thirds partial hepatectomy. Moreover, the zonal distribution of PKL was studied using immunohistochemical techniques. In total liver homogenates PKL activity per g liver decreased after partial hepatectomy, while PKM2 increased. Total PKL activity per 100 g body weight was restored to preoperational levels much more slowly than liver weight. During liver regeneration parenchymal cells acquired high PKM2 besides PKL activity. The isoenzyme outfit of non-parenchymal cells remained unchanged. Microdissection studies showed that PKL lost its normal perivenous to periportal gradient after partial hepatectomy and became evenly distributed within the liver acinus. PKM2 did not retain its even distribution, it became predominant in the periportal zone. Immunohistochemical staining revealed that after partial hepatectomy PKL was present in all parenchymal cells in an atypical non-zonal heterogeneous distribution. Normal specific activities as well as zonal and cellular distributions of both pyruvate kinase isoenzymes were restored 14-21 d after partial hepatectomy. During regeneration after 2/3 partial hepatectomy the liver loses its glucostat function as corroborated in this study by the decrease of the glycolytic capacity via the glucoregulatory PKL; this change of function is accompanied by a loss of PKL-zonation. This finding corroborates the view that zonation of carbohydrate-metabolizing enzymes is required only when the liver functions as a glucostat. The increase of PKM2 and the appearance of a zonal PKM2 heterogeneity are in line with the pattern of hepatocyte proliferation after partial hepatectomy.

Links

PubMed

Keywords

Animals; Electrophoresis, Agar Gel; Hepatectomy; Histocytochemistry; Immunochemistry; Isoenzymes/analysis; Liver/cytology; Liver/enzymology; Liver Regeneration; Male; Pyruvate Kinase/analysis; Rats; Rats, Inbred Strains; Time Factors

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

RAT:KPYM

involved_in

GO:0031100: animal organ regeneration

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

See Help:References for how to manage references in GONUTS.