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首页> 美国卫生研究院文献>Journal of Anatomy and Physiology >Regional specialization of rat quadriceps myosin heavy chain isoforms occurring in distal to proximal parts of middle and deep regions is not mirrored by citrate synthase activity
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Regional specialization of rat quadriceps myosin heavy chain isoforms occurring in distal to proximal parts of middle and deep regions is not mirrored by citrate synthase activity

机译：柠檬酸合酶活性不能反映大鼠股四头肌肌球蛋白重链亚型在中部和深部区域的近端至远端发生的区域专业化

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摘要

Myosin heavy chain (MHC) isoform content and citrate synthase (CS) activities were measured in the Quadriceps femoris (QF) muscle of 18 female rats. The muscle group was divided into superficial, middle and deep, distal, central and proximal parts. MHC IIb and IIx were more abundant in superficial regions (P < 0.05) with low CS activities compared with deeper parts. The deeper parts expressed all four isoforms (MHC IIb, MHC IIx, MHC IIa and MHC I), with a concomitantly higher CS activity. MHC I, MHC IIa and MHC IIb isoform content varied significantly along the length of the deep regions. Only MHC IIb and CS activity in the proximal middle part correlated (negatively) with each other. This study showed that the QF has regional specialization and that standardization of sampling site is important. Furthermore, CS activity and MHC isoforms are only loosely associated, or not at all.
机译：在18只雌性大鼠的股四头肌（QF）肌肉中测量了肌球蛋白重链（MHC）同工型含量和柠檬酸合酶（CS）活性。肌肉群分为浅部，中部和深部，远端，中央和近端。与深部相比，CS活性低的浅表区域MHC IIb和IIx含量更高（P <0.05）。较深的部分表达所有四种同工型（MHC IIb，MHC IIx，MHC IIa和MHC I），同时具有较高的CS活性。 MHC I，MHC IIa和MHC IIb的同工型含量沿深区的长度变化很大。近端中部只有MHC IIb和CS活性彼此相关（负相关）。这项研究表明，合格评定人员具有区域专长，采样地点的标准化很重要。此外，CS活性和MHC同工型仅是松散相关的，或者根本不相关。

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