A new experimental model to study force depression: the Drosophila jump muscle.
A new experimental model to study force depression: the Drosophila jump muscle.
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研究力抑制的新实验模型:果蝇跳跃肌。
DOI:
10.1152/japplphysiol.01029.2013
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Corr,DavidT
中科院分区:
文献类型:
--
作者:
Koppes,RyanA;Swank,DouglasM;Corr,DavidT
Force depression (FD) is a decrease in isometric force following active muscle shortening. Despite being well characterized experimentally, its underlying mechanism remains unknown. To develop a new, genetically manipulatable experimental model that would greatly improve our ability to study the underlying mechanism(s) of FD, we tested theDrosophilajump muscle for classical FD behavior. Steady-state force generation following active shortening decreased by 2, 8, and 11% of maximum isometric force with increasing shortening amplitudes of 5, 10, and 20% of optimal fiber length, and decreased by 11, 8, and 5% with increasing shortening velocities of 4, 20, and 200% of optimal fiber length per second. These steady-state FD (FDSS) characteristics ofDrosophilajump muscle mimic those observed in mammalian skeletal muscle. A double exponential fit of transient force recovery following shortening identified two separate phases of force recovery: a rapid initial force redevelopment, and a slower recovery toward steady state. This analysis showed the slower rate of force redevelopment to be inversely proportional to the amount of FDSS, while the faster rate did not correlate with FDSS.This suggests that the mechanism behind the slower, most likely cross-bridge cycling rate, influences the amount of FDSS. Thus the jump muscle, when coupled with the genetic mutability of its sarcomere proteins, offers a unique and powerful experimental model to explore the underlying mechanism behind FD.
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DOI:
--
发表时间:
1979
期刊:
The Journal of General Physiology
影响因子:
--
作者:
G. Maréchal;L. Plaghki
通讯作者:
L. Plaghki
DOI:
10.1098/rspb.2009.1579
发表时间:
2010-02-07
影响因子:
4.7
作者:
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通讯作者:
Rassier, Dilson E.
影响因子:
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作者:
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通讯作者:
Marc Van Leemputte
影响因子:
64.8
作者:
DRUMMOND, DR;PECKHAM, M;WHITE, DCS
通讯作者:
WHITE, DCS
影响因子:
--
作者:
W. J. Dickinson;John W. Thatcher
通讯作者:
John W. Thatcher