title: Elevated creatine kinase activity in primary hepatocellular carcinoma.
abstract: 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.
authors.affiliation: Department of General and Transplant Surgery, University Hospital, Anichstrasse 35, A-6020 Innsbruck, Austria. GMeffert@gmx.ch <GMeffert@gmx.ch>
authors.forename: Georg
authors.initials: G
authors.lastname: Meffert
authors.forename: Frank N
authors.initials: FN
authors.lastname: Gellerich
authors.forename: Raimund
authors.initials: R
authors.lastname: Margreiter
authors.forename: Markus
authors.initials: M
authors.lastname: Wyss
mesh_terms: 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
chemical_list: D003402:Creatine Kinase; D052276:Creatine Kinase, BB Form; D052281:Creatine Kinase, Mitochondrial Form; D000263:Adenylate Kinase