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• W1971494827 abstract "Background Liver regeneration following partial hepatectomy requires the orchestration of highly regulated molecular pathways; a change in the abundance or activity of a specific gene product has the potential to adversely affect this process. The nuclear factor of activated T-cells (NFAT) transcription factors represent a family of gene transcription signaling intermediates that translate receptor-dependent signaling events into specific transcriptional responses using the Ras/Raf pathway. Materials and Methods Eight-week old NFAT4 knockout (KO) mice and their wild type counterparts (Balb-c) underwent two-thirds partial hepatectomy. The animals were sacrificed and their livers were harvested at specific time points during regeneration. Recovery of liver mass was measured for each time point. PCR analysis was used to analyze expression levels of the immediate early genes c-fos, c-jun and c-myc as well as downstream effectors of NFAT4 including FGF-18 and BMP-4. Results Hepatocyte proliferation and thus liver regeneration following hepatectomy was suppressed in NFAT4 knockout (KO) mice. Statistical significance was reached at 1 h, 7 d, and 10 d (P < 0.05) with a 22% median reduction in regeneration of liver mass in the NFAT4 KO mice by 10 d, at which time liver regeneration should be complete in mice. The immediate early gene c-fos was elevated in NFAT4 KO mice during early regeneration with a median value at 1 h and 1 d of 1.60E-08 and 1.09E-08 versus 6.10E-09 and 1.55E-09 in the Balb-c mice. C-jun, in contrast, was elevated during late regeneration in the NFAT4 KO mice (3.40E-09 and 5.67E-09 at 7 and 10 d, respectively) in comparison with the Balb-c mice (7.76E-10 and 1.24E-09, respectively.). NFAT2 was also up-regulated in the NFAT4 KO mice; however, no changes were detected in its downstream effectors, CCR1 and CCL3. Conclusions We demonstrated that NFAT4 deficiency impairs hepatic regeneration in a murine model proving that NFAT4 plays an important yet unclear role in liver regeneration; its absence may be compensated by c-fos, c-jun, and NFAT2 expression changes. Liver regeneration following partial hepatectomy requires the orchestration of highly regulated molecular pathways; a change in the abundance or activity of a specific gene product has the potential to adversely affect this process. The nuclear factor of activated T-cells (NFAT) transcription factors represent a family of gene transcription signaling intermediates that translate receptor-dependent signaling events into specific transcriptional responses using the Ras/Raf pathway. Eight-week old NFAT4 knockout (KO) mice and their wild type counterparts (Balb-c) underwent two-thirds partial hepatectomy. The animals were sacrificed and their livers were harvested at specific time points during regeneration. Recovery of liver mass was measured for each time point. PCR analysis was used to analyze expression levels of the immediate early genes c-fos, c-jun and c-myc as well as downstream effectors of NFAT4 including FGF-18 and BMP-4. Hepatocyte proliferation and thus liver regeneration following hepatectomy was suppressed in NFAT4 knockout (KO) mice. Statistical significance was reached at 1 h, 7 d, and 10 d (P < 0.05) with a 22% median reduction in regeneration of liver mass in the NFAT4 KO mice by 10 d, at which time liver regeneration should be complete in mice. The immediate early gene c-fos was elevated in NFAT4 KO mice during early regeneration with a median value at 1 h and 1 d of 1.60E-08 and 1.09E-08 versus 6.10E-09 and 1.55E-09 in the Balb-c mice. C-jun, in contrast, was elevated during late regeneration in the NFAT4 KO mice (3.40E-09 and 5.67E-09 at 7 and 10 d, respectively) in comparison with the Balb-c mice (7.76E-10 and 1.24E-09, respectively.). NFAT2 was also up-regulated in the NFAT4 KO mice; however, no changes were detected in its downstream effectors, CCR1 and CCL3. We demonstrated that NFAT4 deficiency impairs hepatic regeneration in a murine model proving that NFAT4 plays an important yet unclear role in liver regeneration; its absence may be compensated by c-fos, c-jun, and NFAT2 expression changes." @default.
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• W1971494827 date "2009-06-01" @default.
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• W1971494827 title "NFAT4 Deficiency Results in Incomplete Liver Regeneration Following Partial Hepatectomy" @default.
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• W1971494827 doi "https://doi.org/10.1016/j.jss.2008.07.023" @default.
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