Suzuki Takahiro, Nishi Yuriko, Koyama Taku, Nakada Minori, Arimatsu Rio, Komiya Yusuke, Ogawa Aoi, Osaki Rika, Maeno Takahiro, Egusa Ai Saiga, Nakamura Mako, Tatsumi Ryuichi, Ojima Koichi, Nishimura Takanori
Laboratory of Muscle and Meat Science, Department of Animal and Marine Bioresource Sciences, Research Faculty of Agriculture, Graduate School of Agriculture, Kyushu University, Fukuoka, Japan.
Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan.
In Vitro Cell Dev Biol Anim. 2025 May 19. doi: 10.1007/s11626-025-01035-0.
Many strains of wild-type laboratory mice have been developed for studies in the life sciences, including skeletal muscle cell biology. Muscle regeneration capacity differs among wild-type mouse strains. However, few studies have focused on whether myogenic stem cells (satellite cells) are directly related to mouse strain-dependent myoregeneration gaps using in vitro culture models. In this study, we selected three major wild-type mouse strains, CD1 (outbred; Jcl:ICR [ICR]), C57BL/6NJcl (inbred; B6), and BALB/cAJcl (inbred; C), which are widely used in laboratory experiments. Initially, we compared myotube fusion capabilities using satellite cell-derived myoblasts. The results showed that cell cultures isolated from male ICR mice could not efficiently form myotubes owing to low expression levels of myogenic regulatory factors (e.g., MyoD, myogenin, myocyte enhancer factor [MEF] 2A, and MEF2C) compared with B6 and C mouse strains. Next, we compared the myofiber-type compositions of muscle tissues and cultured myotubes among male mice from each of the three strains. Although each muscle tissue used for satellite cell isolation similarly expressed fast-twitch myofiber markers in all mouse strains, male ICR-derived myoblasts formed abundant amounts of slow-type myotubes. By contrast, myotubes from male B6 and C mice expressed substantial levels of fast-twitch myofiber markers. We also performed a comparative experiment in female ICR, B6, and C mouse strains, similar to the male mouse experiments. The myogenic differentiation potencies of myoblasts and myofiber-type compositions of myotubes in female mouse strains were similar. Thus, male ICR-derived satellite cells (myoblasts) had low myogenic differentiation potential, which may be associated with the tendency slow-twitch myotube formation.
为了生命科学研究,包括骨骼肌细胞生物学研究,已经培育出了许多野生型实验小鼠品系。野生型小鼠品系之间的肌肉再生能力有所不同。然而,很少有研究聚焦于利用体外培养模型,研究生肌干细胞(卫星细胞)是否与小鼠品系依赖性的肌肉再生差异直接相关。在本研究中,我们选择了三种主要的野生型小鼠品系,即CD1(远交系;Jcl:ICR [ICR])、C57BL/6NJcl(近交系;B6)和BALB/cAJcl(近交系;C),它们在实验室实验中被广泛使用。最初,我们使用卫星细胞来源的成肌细胞比较了肌管融合能力。结果显示,与B6和C小鼠品系相比,从雄性ICR小鼠分离的细胞培养物由于生肌调节因子(如MyoD、肌细胞生成素、肌细胞增强因子[MEF] 2A和MEF2C)表达水平较低,无法有效地形成肌管。接下来,我们比较了这三种品系雄性小鼠肌肉组织和培养肌管的肌纤维类型组成。尽管用于卫星细胞分离的每个肌肉组织在所有小鼠品系中都同样表达快肌纤维标记物,但雄性ICR来源的成肌细胞形成了大量的慢肌型肌管。相比之下,雄性B6和C小鼠的肌管表达了大量的快肌纤维标记物。我们还对雌性ICR小鼠、B6小鼠和C小鼠品系进行了类似雄性小鼠实验的比较实验。雌性小鼠品系中成肌细胞的生肌分化潜能和肌管的肌纤维类型组成相似。因此,雄性ICR来源的卫星细胞(成肌细胞)具有较低的生肌分化潜能,这可能与慢肌型肌管形成的倾向有关。