Elevated creatine kinase activity in primary hepatocellular carcinoma.
BACKGROUND
Inconsistent findings have been reported on the occurrence and relevance of creatine kinase (CK) isoenzymes in mammalian liver cells. Part of this confusion might be due to induction of CK expression during metabolic and energetic stress.


METHODS
The specific activities and isoenzyme patterns of CK and adenylate kinase (AdK) were analysed in pathological liver tissue of patients undergoing orthotopic liver transplantation.


RESULTS
The brain-type, cytosolic BB-CK isoenzyme was detected in all liver specimens analysed. Conversely, CK activity was strongly increased and a mitochondrial CK (Mi-CK) isoenzyme was detected only in tissue samples of two primary hepatocellular carcinomas (HCCs).


CONCLUSIONS
The findings do not support significant expression of CK in normal liver and most liver pathologies. Instead, many of the previous misconceptions in this field can be explained by interference from AdK isoenzymes. Moreover, the data suggest a possible interplay between p53 mutations, HCC, CK expression, and the growth-inhibitory effects of cyclocreatine in HCC. These results, if confirmed, could provide important hints at improved therapies and cures for HCC.
Meffert
Georg
G
Department of General and Transplant Surgery, University Hospital, Anichstrasse 35, A-6020 Innsbruck, Austria. GMeffert@gmx.ch <GMeffert@gmx.ch>
Gellerich
Frank N
FN
Margreiter
Raimund
R
Wyss
Markus
M
D000263:Adenylate Kinase / Q000378:metabolism; D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000201:enzymology*; D003402:Creatine Kinase / Q000378:metabolism*; D052276:Creatine Kinase, BB Form / Q000378:metabolism; D052281:Creatine Kinase, Mitochondrial Form / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000201:enzymology; D008113:Liver Neoplasms / Q000201:enzymology*; D051381:Rats
D003402:Creatine Kinase; D052276:Creatine Kinase, BB Form; D052281:Creatine Kinase, Mitochondrial Form; D000263:Adenylate Kinase