g*********d 发帖数: 233 | 1 人们都知道锻炼身体可以促进新陈代谢,有益于心血管健康,但此前科学家对运动究竟如何影响心脏
却所知甚少。美国哈佛大学医学院的研究人员日前报告说,他们首次从分子水平发现运动有益心脏健
康的机理,这一发现将有助于开发出治疗心血管疾病的新疗法。
研究人员通过小鼠实验发现,经常运动可以使小鼠体内的C/EBPβ转录因子水平显著下降,其结果会促
进小鼠心脏肌肉细胞增殖,有益于心脏生长。此外,研究人员还发现,体内C/EBPβ水平较低的小鼠对
心力衰竭具有抵抗能力。
研究人员表示,这项研究对心脏肌肉再生的潜力有了深入理解。参与研究的哈佛大学医学院教授安东
尼·罗森茨魏希表示,通过这项研究可以开发出针对那些无法运动的心脏病患者的疗法。
这项研究成果发表在新一期美国《细胞》杂志上。
C/EBPβ Controls Exercise-Induced Cardiac Growth and Protects against
Pathological Cardiac Remodeling
Cell, Volume 143, Issue 7, 1072-1083, 23 December 2010
10.1016/j.cell.2010.11.036
Authors
Pontus Boström, Nina Mann, Jun Wu, Pablo A. Quintero, Eva R. Plovie,
Daniela Panáková, Rana K. Gupta, Chunyang Xiao, Calum A. MacRae, Anthony
Rosenzweig, Bruce M. SpiegelmanSee Affiliations
Highlights
Endurance exercise of mice induces cardiomyocyte proliferation
Endurance exercise causes a reduction of C/EBPβ expression and an
increase of CITED4
Reduction of C/EBPβ in vitro induces cellular hypertrophy and
proliferation via CITED4
Genetic reduction of C/EBPβ in vivo results in a phenocopy of the
exercised heart
Summary
The heart has the ability to grow in size in response to exercise, but
little is known about the transcriptional mechanisms underlying
physiological hypertrophy. Adult cardiomyocytes have also recently been
proven to hold the potential for proliferation, a process that could be
of great importance for regenerative medicine. Using a unique RT-PCR-
based screen against all transcriptional components, we showed that
C/EBPβ was downregulated with exercise, whereas the expression of CITED4
was increased. Reduction of C/EBPβ in vitro and in vivo resulted in a
phenocopy of endurance exercise with cardiomyocyte hypertrophy and
proliferation. This proliferation was mediated, at least in part, by the
increased CITED4. Importantly, mice with reduced cardiac C/EBPβ levels
displayed substantial resistance to cardiac failure upon pressure
overload. These data indicate that C/EBPβ represses cardiomyocyte growth
and proliferation in the adult mammalian heart and that reduction in
C/EBPβ is a central signal in physiologic hypertrophy and proliferation.
http://www.cell.com/abstract/S0092-8674(10)01358-9 | p****n 发帖数: 9263 | 2 标题党
竟如何影响心脏
运动有益心脏健
下降,其结果会促
水平较低的小鼠对
医学院教授安东
法。
【在 g*********d 的大作中提到】 : 人们都知道锻炼身体可以促进新陈代谢,有益于心血管健康,但此前科学家对运动究竟如何影响心脏 : 却所知甚少。美国哈佛大学医学院的研究人员日前报告说,他们首次从分子水平发现运动有益心脏健 : 康的机理,这一发现将有助于开发出治疗心血管疾病的新疗法。 : 研究人员通过小鼠实验发现,经常运动可以使小鼠体内的C/EBPβ转录因子水平显著下降,其结果会促 : 进小鼠心脏肌肉细胞增殖,有益于心脏生长。此外,研究人员还发现,体内C/EBPβ水平较低的小鼠对 : 心力衰竭具有抵抗能力。 : 研究人员表示,这项研究对心脏肌肉再生的潜力有了深入理解。参与研究的哈佛大学医学院教授安东 : 尼·罗森茨魏希表示,通过这项研究可以开发出针对那些无法运动的心脏病患者的疗法。 : 这项研究成果发表在新一期美国《细胞》杂志上。 : C/EBPβ Controls Exercise-Induced Cardiac Growth and Protects against
| g********0 发帖数: 6201 | 3 Bruce现在的研究风格是专做回锅肉,我老要向他学习。 |
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