Document Detail


Pyruvate kinase isozymes in cells isolated from fetal and regenerating rat liver.
MedLine Citation:
PMID:  843536     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
There are at least three major mammalian isozymes of pyruvate kinase (ATP : pyruvate 2-O-phosphotransferase, EC 2.7.1.40), designated K4, L4, and M4. Whereas parenchymal cells from adult rat liver contain only the type L isozyme, parenchymal cells isolated from fetal and regenerating liver were found to synthesize both the K4 and L4 isozymes. A small amount of K-M hybrid was seen in regenerating liver, but there were no detectable M-L or K-L hybrids. Thus, it appears that type L pyruvate kinase is not synthesized at the same time in the same liver cell with either of the other two isozymes. The intermediate electrophoretic bands seen with homogenates of whole fetal liver, and in some earlier work attributed to either hybrid isozymes or to the presence of M4, are contributed by nonparenchymal cells which, in the fetus, are largely hemopoietic. These additional bands of pyruvate kinase are electrophoretically and immunologically similar to the pyruvate kinase isozymes found in adult erythrocytes. The results reported here suggest a very rigorous control in the synthesis of K4 and L4 isozymes in parenchymal cells of both fetal and regenerating liver as opposed to developing neurons and glia, where the shift from synthesis of type K to type M subunits appears to occur gradually and results in the production of substantial amounts of hybrid isozymes.
Authors:
R D Dyson; J M Cardenas; T C Richards; M E Garnett
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  481     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1977 Mar 
Date Detail:
Created Date:  1977-05-12     Completed Date:  1977-05-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  115-26     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Electrophoresis
Isoenzymes*
Liver / embryology,  enzymology*
Liver Regeneration*
Pyruvate Kinase*
Rats
Chemical
Reg. No./Substance:
0/Isoenzymes; EC 2.7.1.40/Pyruvate Kinase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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