Microinjection of calpastatin inhibits fusion in myoblasts.

Microinjection of calpastatin inhibits fusion in myoblasts.
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显微注射卡帕他汀抑制成肌细胞的融合。

DOI:
10.1006/excr.1998.4362
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发表时间:
1999
期刊:
Experimental cell research.
影响因子:
--
通讯作者:
Goll,DE
Goll,DE
中科院分区:
--
文献类型:
--
作者:
Temm-Grove,CJ;Wert,D;Thompson,VF;Allen,RE;Goll,DE

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用纯化的钙蛋白酶抑制蛋白或m-钙蛋白酶显微注射大鼠卫星细胞(RSC),用纯化的钙蛋白酶抑制蛋白显微注射C2 C12小鼠系的成肌细胞。钙蛋白酶抑制蛋白的显微注射完全阻止从两个来源的成肌细胞的融合,而显微注射与m-钙蛋白酶显着增加了培养的RSC的融合率; 44%的RSC培养物的细胞核在多核肌管显微注射后48小时内与m-钙蛋白酶加标记葡聚糖,而只有15%的细胞核在多核肌管显微注射后与葡聚糖单独。Western分析表明,RSC和C2 C12成肌细胞在融合前均不含可检测量的μ-calpain。C2 C12成肌细胞中的钙蛋白酶抑制蛋白水平随着细胞从增殖阶段到融合开始而增加,并且这些水平在C2 C12和RSC细胞中随着它们进展到晚期或融合后阶段而显著增加。RSC和C2 C12成肌细胞都含有一个80 kDa的多肽,该多肽在Western印迹中用抗m-钙蛋白酶抗体标记。结果是一致的钙蛋白酶系统(在这些成肌细胞系中的m-钙蛋白酶)在细胞融合过程中的细胞骨架/质膜相互作用的重塑中的作用。
Rat satellite cells (RSC) were microinjected with purified calpastatin or m-calpain, and myoblasts from a C2C12mouse line were microinjected with purified calpastatin. Microinjection with calpastatin completely prevented fusion of myoblasts from both sources, whereas microinjection with m-calpain significantly increased the rate of fusion of cultured RSC; 44% of the nuclei of RSC cultures were in multinucleated myotubes within 48 h after microinjection with m-calpain plus labeled dextran, whereas only 15% of the nuclei were in multinucleated myotubes after microinjection with dextran alone. Western analyses indicated that neither RSC nor C2C12myoblasts contained detectable amounts of μ-calpain before fusion. The levels of calpastatin in C2C12myoblasts increased as cells passed from the proliferative stage to the onset of fusion, and these levels increased substantially in both the C2C12and the RSC cells as they progressed to the late or postfusion stage. Both RSC and C2C12myoblasts contained an 80-kDa polypeptide that was labeled with an anti-m-calpain antibody in Western blots. The results are consistent with a role of the calpain system (m-calpain in these myoblast lines) in remodeling of the cytoskeletal/plasma membrane interactions during cell fusion.
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