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Myogenic Progenitor Cells in Runt Pigs

机译:猪猪中的肌源性祖细胞

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Runt pigs exhibit decreased postnatal growth compared to their normal littermates. Skeletal muscle satellite progenitor cells play a crucial role in muscle fiber development and postnatal muscle growth. The side population (SP) has recently been identified from skeletal muscle using fluorescence-activated cell sorting (FACS) and exhibits both hematopoietic and myogenic capabilities. To this end, we analyzed semitendinosus (ST) muscles of 2 d old littermate normal (1.5 ± 0.05 kg) or runt (0.8 ± 0.06 kg) piglets for satellite cell and SP numbers. Muscles of runt pigs possessed smaller circumferences (P < 0.05), total fiber numbers (P < 0.05), and average fiber sizes (P < 0.05) compared to those from normal pigs. Concentration of total protein (P = 0.18) or DNA (P = 0.76), however, was not different. Total RNA and DNA content were greater (P < 0.05) in ST from normal compared to runt pigs. Satellite cell yield per g ST muscle obtained by primary cell culture from both groups was not different (P = 0.67). Proliferative capacity was not different at 0, 24, and 48 h in culture, but tended to be higher for cells from normal pigs at 72 h compared to runt pigs (P = 0.07). Muscle from runts yielded lower SP frequencies (normal, 9.16% versus runts, 1.22%; P = 0.034). These results confirm runt pigs have decreased muscle size and fiber number and suggest aberrations in myogenic stem cell populations play a critical role in this growth retardation model.
机译:与其正常的凋落物相比,runt猪表现出产后增长降低。骨骼肌卫星祖细胞在肌纤维发育和产后肌肉生长中起着至关重要的作用。最近使用荧光激活的细胞分选(FACS)从骨骼肌中鉴定了侧面群(SP)并表现出造血和肌源性能力。为此,我们分析了卫星电池和SP数字的2D旧窝液正常(1.5±0.05千克)或粉碎(0.8±0.06千克)仔猪的半念珠菌(ST)肌肉。与普通猪的肌肉具有较小的圆周(P <0.05),总纤维数(P <0.05)和平均纤维尺寸(P <0.05)的肌肉具有较小的圆形(P <0.05)。然而,总蛋白质(p = 0.18)或DNA(p = 0.76)并不不同。与猪猪相比,ST的ST总RNA和DNA含量较大(P <0.05)。通过来自两个基团的原发性细胞培养物获得的每G ST肌肉的卫星电池产率不含量(P = 0.67)。在培养物中,增殖能力在0,24和48小时内没有不同,但与猪猪相比,72h的普通猪细胞趋于更高(P = 0.07)。来自RANT的肌肉产生较低的SP频率(正常,9.16%与梯级,1.22%; P = 0.034)。这些结果证实了runt猪的肌肉尺寸和纤维数量减少,并表明肌源性干细胞群中的像差在该生长延迟模型中发挥着关键作用。

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