comprehensive study on the mechanisms of liver regeneration toward clinical molecular targeting therapy
肝再生机制综合研究面向临床分子靶向治疗
基本信息
- 批准号:17390357
- 负责人:
- 金额:$ 10.72万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2005
- 资助国家:日本
- 起止时间:2005 至 2007
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Liver regeneration is composed of a series of complicated processes. The present study was designed to investigate the roles of Jak/STAT3 and PDK1/akt-associated pathways in liver regeneration following partial hepatectomy (PH) using liver-specific STAT3-knockout (L-S3KO), Pdk1-knockout (L-Pdk1KO) and Pdk1/STAT3 double KO (L-DKO) mice.1) Proliferation of hepatocytes following PH was markedly suppressed in LS3-KO mice with reduced cyclinD1 transcript. However, liver mass recovered sufficiently following PH in LS3-KO mice almost equal to that of control mice. Cell size following hepatectomy was significantly larger in LS3-KO mice than in control mice. Hepatectomy induced immediate but transient phosphorylation of Akt, p70S6K, mTOR and GSK-3b in LS3-KO mice much more than in control mice. Additionally, adenoviral transfection of dominant negative mutant of Akt to control and LS3-KO mice led to insufficient liver regeneration following hepatectomy.2) 70% PH was lethal in L-Pdk1KO mice with … More no liver regeneration. Liver regeneration was severely impaired equally in L-Pdk1KO and L-DKO mice even after non-lethal 30% PH. Measurement of cell size revealed that cell growth following hepatectomy did not occur at all in L-Pdk1KO mice, though post-PH mitotic response occurred to the same degree to the control liver. In L-Pdk1KO mice, post-PH phosphorylation of Akt, mTOR, p70^<56K> and S6 were also reduced.Re-activation of Akt by introducing 'pif-pocket' mutant of PDK1 in L-Pdk1KO mice lead normal liver regeneration and cell growth in the post-PH liver without affecting cell proliferation. Activation of Pl3-K in the liver of L-Pdk1KO mice increased mitotic cells via STAT3 activation, but did not improve impaired liver regeneration in L-Pdk1KO mice at all. Taken together, these facts indicate that Pl3-K and PDK1/Akt contribute to liver regeneration by regulating cell proliferation and size, respectively. PDK1/Akt-mediated responsive cell growth is essential in normal liver regeneration following PH especially when cell proliferation is impaired. Less
肝脏再生由一系列复杂的过程组成。本研究旨在利用肝脏特异性 STAT3 敲除 (L-S3KO)、Pdk1 敲除 (L-Pdk1KO) 和 Pdk1/STAT3 双 KO (L-DKO) 小鼠,研究部分肝切除 (PH) 后 Jak/STAT3 和 PDK1/akt 相关通路在肝再生中的作用。 1) 肝细胞增殖 在具有减少的 cyclinD1 转录物的 LS3-KO 小鼠中,PH 后的 PH 显着受到抑制。然而,LS3-KO 小鼠的 PH 后肝脏质量充分恢复,几乎与对照小鼠相同。 LS3-KO 小鼠肝切除后的细胞大小明显大于对照小鼠。肝切除术在 LS3-KO 小鼠中诱导的 Akt、p70S6K、mTOR 和 GSK-3b 的立即但短暂的磷酸化程度远高于对照小鼠。此外,将 Akt 显性失活突变体腺病毒转染至对照小鼠和 LS3-KO 小鼠,会导致肝切除术后肝再生不足。2) 70% PH 对于无肝再生的 L-Pdk1KO 小鼠来说是致命的。即使在非致死性 30% PH 后,L-Pdk1KO 和 L-DKO 小鼠的肝再生也同样受到严重损害。细胞大小的测量表明,L-Pdk1KO 小鼠中肝切除后根本没有发生细胞生长,尽管 PH 后有丝分裂反应与对照肝脏发生相同程度的反应。在 L-Pdk1KO 小鼠中,Akt、mTOR、p70^<56K> 和 S6 的 PH 后磷酸化也降低。通过在 L-Pdk1KO 小鼠中引入 PDK1 的“pif-pocket”突变体来重新激活 Akt,可导致 PH 后肝脏中正常的肝再生和细胞生长,而不影响细胞增殖。 L-Pdk1KO 小鼠肝脏中 Pl3-K 的激活通过 STAT3 激活增加了有丝分裂细胞,但根本没有改善 L-Pdk1KO 小鼠受损的肝脏再生。综上所述,这些事实表明 Pl3-K 和 PDK1/Akt 分别通过调节细胞增殖和大小来促进肝再生。 PDK1/Akt 介导的反应性细胞生长对于 PH 后正常肝脏再生至关重要,尤其是当细胞增殖受损时。较少的
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
The significant correlation between surgical stress of hepatectomy and changes in the serum levels of HGF, IL-6 and soluble Fas in the patients with viral hepatitis
病毒性肝炎患者肝切除手术应激与血清HGF、IL-6、可溶性Fas水平变化的显着相关性
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:Naoto Gotohda;Hiromi Iwagaki;Michitaka Ozaki;Taira Kinoshita;Masaru Konishi;Toshio Nakagohri;Shinichiro Takahashi;Shinya Saito;Takahito Yagi;Noriaki Tanaka
- 通讯作者:Noriaki Tanaka
Small liver graft regenerates through immediate increase of HGF and IL-6-possible involvement of sinusoidal shear stress in small liver graft-.
小肝移植物通过 HGF 和 IL-6 的立即增加而再生——可能涉及小肝移植物中的正弦剪切应力——。
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:Takanori Oyama;Hiroshi Sadamori;Hiroyoshi Matsukawa;Hiroshi Murata;Yuzou Umeda;Yasuhiro Watanabe;Michitaka Ozaki;Hiromi Iwagaki;Noriaki Tanaka;Takahito Yagi.
- 通讯作者:Takahito Yagi.
Impact of Ischemia-Reperfusion and Hepatic Resection on Tumor Progression.
缺血再灌注和肝切除对肿瘤进展的影响。
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Hiroki Suemoto;Katsuhiro Nishioka;Misako Sato;Akira Ooshima;Shunji Itoh;Ikuji Hatamura;Michitaka Ozaki;Attila Braun;Erika Gustafsson;Reinhard Fassler;Michitaka Ozaki and Satoru Todo. Surgical Stress and Tumor Behavior
- 通讯作者:Michitaka Ozaki and Satoru Todo. Surgical Stress and Tumor Behavior
肝障害・再生におけるSTAT3の新たな機能とその役割-分子標的治療への応用とその可能性について-
STAT3在肝损伤和再生中的新功能和作用-在分子靶向治疗中的应用及其潜力-
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:尾崎倫孝;芳賀早苗;藤堂省
- 通讯作者:藤堂省
Transduction of exogenous Stat3 into dispersed islet induces proliferation of rat pancreatic β-cell.
将外源 Stat3 转导至分散的胰岛可诱导大鼠胰腺 β 细胞增殖。
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Tsukiyama S;Matsushita M;Kamachi H;Matsumoto S;Morita T;Kobayashi S;Tamura H;Ozaki M;Todo S.
- 通讯作者:Todo S.
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OZAKI Michitaka其他文献
OZAKI Michitaka的其他文献
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{{ truncateString('OZAKI Michitaka', 18)}}的其他基金
Analysis of regulatory mechanism for liver regeneration by various types of cell death(autophagy and apoptosis)
各类细胞死亡(自噬和凋亡)对肝再生的调控机制分析
- 批准号:
23659631 - 财政年份:2011
- 资助金额:
$ 10.72万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Development of comprehensive methods for diagnosis/therapy by optic bio-imaging
光学生物成像诊断/治疗综合方法的开发
- 批准号:
20249060 - 财政年份:2008
- 资助金额:
$ 10.72万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
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Insulin and DGF signal transduction in human granulosa cells: Impact on cell proliferation, survival and cell differentiation in folliculogenesis
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5378769 - 财政年份:2002
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