Neuromuscular adaptations to cross-reinnervation in 12- and 29-mo-old Fischer 344 rats.

Neuromuscular adaptations to cross-reinnervation in 12- and 29-mo-old Fischer 344 rats.
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12 个月和 29 个月大的 Fischer 344 大鼠的神经肌肉对交叉神经支配的适应。

DOI:
10.1152/ajpcell.1991.260.1.c96
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发表时间:
1991
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
White,TP
White,TP
中科院分区:
--
文献类型:
--
作者:
Clark,KI;White,TP

文献摘要

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目的是测试12个月和29个月大鼠的指长伸肌(EDL)在去神经和比目鱼肌神经交叉再支配后的适应性反应的假说。12-mo(99+/-3 mg)和29-mo(74+/-3 mg)大鼠交叉神经支配的EDL肌质量分别是自身神经支配对照组的87%和86%。在12个月(1,733+/-253微米2)和29个月(1,264+/-71个微米2)大鼠,交叉神经支配的EDL纤维面积分别是自身神经支配面积的56%和67%。交叉神经再支配使12个月龄大鼠的神经接触密度增加26%,29个月龄大鼠神经接触密度降低50%。在12个月的大鼠中,17%的运动终板(MEP)在交叉神经再支配后没有终末神经,而在29个月的大鼠中这一比例为48%。在交叉神经支配的肌肉中,慢肌球蛋白重链(MHC)在12个月和29个月时分别占总MHC的65+/-9和25+/-3%。I型纤维在12个月龄大鼠和29个月龄大鼠分别为65+/-8%和18+/-1%。总之,神经切断后,神经元重新支配MEP区的能力随着年龄的增长而降低。神经支配纤维中纤维类型对交叉神经再支配的反应可能不会因年龄的不同而不同。
The aim was to test hypotheses regarding the adaptive response of the extensor digitorum longus (EDL) muscle of 12- and 29-mo rats following denervation and cross-reinnervation by the soleus nerve. The mass of cross-reinnervated EDL muscle was 87 and 86% of self-reinnervated control values in 12-mo (99 +/- 3 mg) and 29-mo (74 +/- 3 mg) rats, respectively. Cross-reinnervated EDL fiber area was 56 and 67% of self-reinnervated values in 12-mo (1,733 +/- 253 microns 2) and 29-mo (1,264 +/- 71 microns 2) rats, respectively. Cross-reinnervation increased the density of neural contact 26% in 12-mo rats and decreased density by 50% in 29-mo animals. In 12-mo rats 17% of motor end plates (MEP) were void of terminal nerves following cross-reinnervation compared with 48% in 29-mo rats. In cross-reinnervated muscles, slow myosin heavy chain (MHC) was 65 +/- 9 and 25 +/- 3% of total MHC in 12- and 29-mo rats, respectively. The percentage of type I fibers derived histochemically was 65 +/- 8% in 12-mo rats and 18 +/- 1% in 29-mo rats. In conclusion, there is an age-associated decrease in the ability of neurons to reinnervate the MEP area after nerve section. The conversion of fiber type in innervated fibers in response to cross-reinnervation may not differ due to age.
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发表时间: 1971-01-01
影响因子: 5.5
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