骨髓(Bone Marrow)是不少幹細胞的聚居地,而紅血球、白血球、血小板等都是從骨髓裡頭的幹細胞而來。1073Please respect copyright.PENANAp9gQpLHboX1073Please respect copyright.PENANAyviZ7hM1yJ
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(圖2)老鼠在跑動滾輪運動四星期後,其頭腦骨髓裡專門負責製造免疫細胞的幹細胞數量並沒有明顯改變。1073Please respect copyright.PENANAlmdUxFsCl3
而在運動時候所用到的腳骨內,專門負責製造免疫細胞的幹細胞數量則有所增加。1073Please respect copyright.PENANAvrQoPq8sKc1073Please respect copyright.PENANArlSPtzw2X1
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(圖3)研究發現(Ref1),骨髓裡某類型的幹細胞表面有著名為Pizeo1的蛋白質。1073Please respect copyright.PENANArRPZk8o2bH
當它受到運動等的物理刺激後,便會催動自身幹細胞演變成為骨細胞,同時亦會釋放物質,誘導其他幹細胞演變成為與免疫系統有關的細胞。1073Please respect copyright.PENANAf3po9cGCWJ1073Please respect copyright.PENANAaifjk1HDB4
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缺乏Pizeo1蛋白質的老鼠當受到細菌感染的時候,所產生的免疫系統細胞數量亦明顯比擁有Pizeo1蛋白質的老鼠為少。1073Please respect copyright.PENANAdb5X11mvM9
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而除運動外,歲數亦會影響與免疫系統有關的幹細胞數量,18個月大的老鼠其數量明顯少於2個月大的老鼠。1073Please respect copyright.PENANAnVq23i4vzq
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若人類亦是採用相同機制的話,這或許是其中一道解釋運動能提升身體免疫力的理據。1073Please respect copyright.PENANAZS15Ru0Ouj
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Ref1:https://www.nature.com/articles/s41586-021-03298-51073Please respect copyright.PENANAPUz3L2Cibf