Continuous high expression of XBP1 and GRP78 is important for the survival of bone marrow cells in CCl{sub 4}-treated cirrhotic liver
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube, Yamaguchi 755-8505 (Japan)
- Science Research Center, Yamaguchi University, Minami Kogushi 1-1-1, Ube, Yamaguchi 755-8505 (Japan)
- Department of Neuroanatomy and Neuroscience, Yamaguchi University School of Medicine, Minami Kogushi 1-1-1, Ube, Yamaguchi 755-8505 (Japan)
- Department of Developmental and Regenerative Biology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8510 (Japan)
We have previously shown that infusion of bone marrow cells (BMC) improves CCl{sub 4}-induced cirrhosis. However, it is unclear why the injected BMC are resistant to CCl{sub 4} damage and subsequently improve the local microenvironment in damaged liver. To analyze the cellular phenomena involved in this process, we studied the damaged liver using electron microscopy. We found that CCl{sub 4} caused rough endoplasmic reticula to swell in hepatocytes. To analyze the gene expression patterns associated with this process, we conducted PCR-selected suppressive subtractive hybridization. We found that expression levels of HSP84, HSP40, and XBP1 differed markedly between control liver and liver infused with BMC. Immunohistochemical staining revealed that expression levels of HSP84 and HSP40 were markedly higher in the early phase of differentiation immediately after BMC infusion, but decreased over time. XBP1 expression remained high during the late phase, and GRP78 expression increased with XBP1 activation. We also found that GFP-positive BMC expressed XBP1 and GRP78. XBP1 and GRP78 are associated with ER stress. Thus, continuous high XBP1 and GRP78 expression might be essential for the survival and proliferation of BMC in a CCl{sub 4}-induced persistent liver damage environment.
- OSTI ID:
- 21043653
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 367, Issue 3; Other Information: DOI: 10.1016/j.bbrc.2007.12.171; PII: S0006-291X(07)02807-0; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
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