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Default NMR detection of creatine kinase expressed in liver of transgenic mice: determination

NMR detection of creatine kinase expressed in liver of transgenic mice: determination of free ADP levels.

Related Articles NMR detection of creatine kinase expressed in liver of transgenic mice: determination of free ADP levels.

Proc Natl Acad Sci U S A. 1990 Apr;87(8):3112-6

Authors: Koretsky AP, Brosnan MJ, Chen LH, Chen JD, Van Dyke T

To use the equilibrium established by creatine kinase (CK) to determine hepatic free ADP levels, the transcriptional control elements of the transthyretin gene were used to direct expression of the CK B isozyme to the livers of transgenic mice. Activities of CK ranging from 80-250 mumol per min per g (wet weight) were detected in liver extracts from five founder mice. The CK activity was stably transmitted to subsequent generations. Isozyme gels and immunoblots confirmed that the activity detected in extracts was due to the B isozyme of CK. Immunohistology indicated that the protein was expressed uniformly throughout the liver and was localized primarily to the cytoplasm. 31P NMR spectroscopy was used to detect the metabolic product of the CK reaction, phosphocreatine, demonstrating that the enzyme was active in vivo. The phosphocreatine level fell rapidly during anoxia (t1/2 = 1 min), indicating that the CK reaction was integrated into hepatic energy metabolism. The equilibrium established by CK was used to calculate a hepatic free ADP level of 0.059 +/- 0.004 mumol/g (wet weight). In vivo NMR studies of these mice will be valuable for studying the role of free ADP in regulating liver metabolism.

PMID: 2326269 [PubMed - indexed for MEDLINE]



Source: PubMed
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