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• W2069897790 abstract "Accumulating evidence indicates that gap junctions play an important role in the maintenance of normal cell growth, so that genes for the connexin gap junction proteins form a family of tumor-suppressor genes. Although mice from which nine types of connexin gene are deleted have been established, little information from carcinogenesis experiments with these mice is available. We have previously found several mutant forms of connexin 32 (Cx32) to be able to inhibit, in a dominant-negative manner, gap junctional intercellular communication (GJIC) exerted by wild-type Cx32. By introducing a gene for such a dominant-negative Cx32 mutant expressed under the control of a liver-specific albumin gene promoter, we have generated transgenic mouse lines in which the function of Cx32 is down-regulated only in the liver. Although GJIC was diminished in the transgenic liver as expected, the reduced GJIC did not affect viability nor the number of spontaneous liver tumors. Although susceptibility to diethylnitrosamine-induced hepatocarcinogenesis was significantly elevated in the transgenic mice, liver regeneration after partial hepatectomy was delayed compared with wild-type mice, suggesting that gap junctions function not only to suppress excessive cell growth but also to promote cell proliferation when necessary for normal function of tissues. Although the phenotype of Cx32-deficient mice was similar to that of the transgenic mice, the former showed more drastically altered phenotypes, i.e. increased BrdU incorporation in the quiescent liver and development of spontaneous liver tumors. We also established 3T3 fibroblasts from embryos lacking the Cx43 gene and characterized their growth. These fibroblasts showed no difference from the wild type in growth characteristics. From these and other studies, we suggest that gap junctions do not necessarily suppress cell growth but support an optimal growth rate." @default.
• W2069897790 created "2016-06-24" @default.
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• W2069897790 date "2001-06-01" @default.
• W2069897790 modified "2023-09-28" @default.
• W2069897790 title "Involvement of gap junctions in tumor suppression: analysis of genetically-manipulated mice" @default.
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• W2069897790 doi "https://doi.org/10.1016/s0027-5107(01)00120-8" @default.
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