| Project/Area Number |
07670607
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Gastroenterology
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| Research Institution | Kyoto Prefectural University of Medicine |
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Principal Investigator |
IWAI Masaki Kyoto Prefectural University of Medicine, School of Medicine Assistant Professor, 医学部, 助手 (90184853)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Hepatocellular carcinoma / alpha-Fetoprotein / Albumin / Cell differentiation / Gap junction / Gene therapy / ギャプ結合 / ギャップジャンクション |
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| Research Abstract |
We investigated formation of gap junction (GJ), which has a function of cell to cell communication and differential expression of alpha-fetoprotein (AFP) and albumin (ALB) in ontogenesis of the liver to clarify a role for differentiation of hepatocytes.
Connexin (Cx) 32 which is a subunit protein of GJ was expressed before birth by northern blot, and expression of Cx32 and Cx26 were increased after birth. Immunofluorescent study in gestational period showed large plaques of Cx32, and Cx32-and Cx26-positive plaques were scatteredly seen on some hepatocytes. AFP expression by in situ hybridization and immunocytochemistry was seen in all hepatocytes and ALB was already expressed in some hepatocytes. Just after birth Cx32-and Cx26-positive plaques were increased and GJ was ultrastructurally seen. AFP expression was decreased and ALB was expressed in all hepatocytes. A week after birth Cx32-positive small plaques were diffusely distributed in all hepatocytes and Cx26-positive plaques were localized in periporta tract, and structure of GJ was increased in number. AFP expression was remained in a few hepatocytes of central area and ALB expression was accentuated in portal tract.
These findings suggest that formation of GJ in ontogenesis of the liver is closely related with differential expression of AFP and ALB,and compulsory expression of Cx may induce well differentiation in hepatoma cells and lead to one of gene therapy for hepatoma.
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