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Up-regulation of Metabotropic glutamate receptor 3 (mGluR3) in rat fibrosis and cirrhosis model of persistent hypoxic condition

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Abstract

Glutamate is the major excitatory neurotransmitter in the central nervous system, and evidence for peripheral glutamatergic fibers in mammals is still lacking. However, glutamate receptors have been identified in peripheral organs, including taste buds, myenteric plexus, and pancreatic islet cell. Protection against anoxic damage could also be explained by mechanisms mediated by postsynaptic mGluR2 or mGluR3, such as the inhibition of membrane excitability resulting from a reduction of cAMP formation by a G-protein-dependent modulation of ion channels. In addition, activation of mGluR3 present in glial cells may contribute to neuroprotection by enhancing the production of death. Thus, mGluR2/3 behaves potentially as a major defensive mechanism anoxia-tolerant species. There are a few reports for the regional pattern of hypoxic damage, which was inversely related to the expression of mGluR2/3. The aim of this study was to characterize the expression of mGluR3 in hypoxic liver in experimental model of rat liver. Proteomic analysis of protein extracts from CCl4–induced cirrhotic liver revealed the presence␣of the mGluR3. The presence of mGluR3 in the cirrhotic liver was confirmed by immunohistochemical analysis. There were a number of macrophages expressing mGluR3 mainly in the fibrous septa. After 2 weeks recovery, however, most of mGluR3 positive macrophages disappeared with collagen fibers. These results demonstrate that mGluR3 involved in the liver in response to persistent hypoxic status such as fibrotic/cirrhotic condition, and suggest that the expression of mGluR3 may be a key role functional metabolism and viability in the liver by interacting with the glutamate receptors in vivo.

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Acknowledgement

The work presented in this paper was supported by the Brain Korea 21 Project in 2006.

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Authors and Affiliations

  1. Department of Veterinary Pathology, College of Veterinary Medicine, Kyungpook National University, 702-701, #1370 Sangyeok-dong, Buk-gu, Daegu, Republic of Korea

    Sun Hee Do, Hae-Sun Yun, Won-Il Jeong, Da-Hee Jeong, Mi-Ran Ki, Jae-Yong Chung, Sang-Joon Park & Kyu-Shik Jeong

  2. Department of Veterinary Pathology, College of Veterinary Medicine, Gyeongsang National University, Jinju , 660-701, Republic of Korea

    Soon-Bok Kim

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  1. Sun Hee Do
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Correspondence to Kyu-Shik Jeong.

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Do, S.H., Yun, HS., Jeong, WI. et al. Up-regulation of Metabotropic glutamate receptor 3 (mGluR3) in rat fibrosis and cirrhosis model of persistent hypoxic condition. Mol Cell Biochem 294, 189–196 (2007). https://doi.org/10.1007/s11010-006-9259-7

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  • DOI: https://doi.org/10.1007/s11010-006-9259-7

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