NDLI: Excess Copper and Ceruloplasmin Biosynthesis in Long-term Cultured Hepatocytes from Long-Evans Cinnamon (LEC) Rats, a Model of Wilson Disease

Content Provider	Journal of Biological Chemistry (JBC)
Author	Nakamura, Kimitoshi Endo, Fumio Ueno, Tetsuro Awata, Hisataka Tanoue, Akito Matsuda, Ichiro
Abstract	Immortalized hepatic cell lines obtained from laboratory animals or patients with defects in copper metabolism in the liver provide new approaches to examine related metabolism and toxicity. We established a series of hepatic cell lines from the liver of Long-Evans Cinnamon (LEC) rats, using recombinant adenovirus which expresses SV40 large T. Cells from the LEC rats were cultured and accumulated larger amounts of copper than did control cells, when the concentrations of copper in the culture medium exceeded 5 μM. The secretion of ceruloplasmin (CP) from the cultured cells was not reduced in hepatocytes from LEC cells, as compared with the control cells. As accumulation of copper did not affect CP secretion, CP production was not likely to be affected by the accumulation of copper in LEC rat hepatocytes. The production of holo-CP was further investigated by transfection of human CP cDNA and detection of human holo-CP by immunological procedures and use of a monoclonal antibody (mAb CP60) which recognizes human holo-CP but not human apo-CP and rat CP. Hepatocytes from the LEC rats processed and secreted holo-CP into the medium, even with excess copper present in the medium. These observations suggest that the genetic defect in LEC rats did not alter biosynthetic and secretory pathways of CP and that the intracellular copper concentration did not regulate the synthesis and processing of CP in the cultured hepatocytes. Low ceruloplasmin levels are observed in most, but not all, patients with Wilson disease, as well as in LEC rats. Our results do suggest that the copper transporting ATPase encoded in the Wilson disease gene is not a integral part of the biochemical mechanism of copper incorporation into apoprotein. The cell lines and immunological procedures we used are expected to add to information on biologically important process related to copper metabolism and to CP biosynthesis.
Related Links	http://www.jbc.org/content/270/13/7656.abstract
Ending Page	7660
Starting Page	7656
Page Count	5
File Format	HTM / HTML PDF
ISSN	00219258
Journal	Journal of Biological Chemistry (JBC)
Issue Number	13
Volume Number	270
DOI	10.1074/jbc.270.13.7656
e-ISSN	1083351X
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	1995-03-31
Access Restriction	Open
Subject Keyword	Cell Biology and Metabolism
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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