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| 購買進(jìn)口儀器、試劑和耗材——就在始于2001年的畢特博生物 www.gducity.com |
日本慶應(yīng)義塾大學(xué)教授河上裕率領(lǐng)的研究小組近日在美國在線雜志《科學(xué)公共圖書館綜合卷》上發(fā)表論文說，他們利用人體誘導(dǎo)多功能干細(xì)胞（iPS細(xì)胞），首次成功培養(yǎng)出色素細(xì)胞。 研究小組向人體皮膚細(xì)胞植入3個(gè)基因，培養(yǎng)生成誘導(dǎo)多功能干細(xì)胞，并培育出名為“胚狀體（EB）”的細(xì)胞團(tuán)塊。接著，研究人員向胚狀體植入人體制造色素細(xì)胞時(shí)所必需的成分，培育兩個(gè)月左右，結(jié)果獲得的細(xì)胞中有60％至70％是人體色素細(xì)胞。 色素細(xì)胞存在于人體皮膚等處，能夠制造黑色素，防止人體遭受紫外線傷害。色素細(xì)胞如果出現(xiàn)癌變，就會(huì)患上惡性黑色素瘤等，而出現(xiàn)皮膚變白癥狀的白癜風(fēng)和白化病以及白發(fā)等均被認(rèn)為是色素細(xì)胞減少造成的。研究小組認(rèn)為，新成果將有助于弄清上述疾病的致病原因，并且在制藥和制作人造皮膚等再生醫(yī)療中得到應(yīng)用。 推薦原文出處： PLoS ONE 6(1): e16182. doi:10.1371/journal.pone.0016182 Generation of Human Melanocytes from Induced Pluripotent Stem Cells Shigeki Ohta1#, Yoichi Imaizumi2#, Yohei Okada2,3, Wado Akamatsu2, Reiko Kuwahara1, Manabu Ohyama4, Masayuki Amagai4, Yumi Matsuzaki2, Shinya Yamanaka5,6, Hideyuki Okano2?*, Yutaka Kawakami1?* 1 Division of Cellular Signaling, Institute for Advanced Medical Research, Keio University School of Medicine, Tokyo, Japan, 2 Department of Physiology, Keio University School of Medicine, Tokyo, Japan, 3 Kanrinmaru Project, Keio University School of Medicine, Tokyo, Japan, 4 Department of Dermatology, Keio University School of Medicine, Tokyo, Japan, 5 Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan, 6 Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto, Japan Abstract Epidermal melanocytes play an important role in protecting the skin from UV rays, and their functional impairment results in pigment disorders. Additionally, melanomas are considered to arise from mutations that accumulate in melanocyte stem cells. The mechanisms underlying melanocyte differentiation and the defining characteristics of melanocyte stem cells in humans are, however, largely unknown. In the present study, we set out to generate melanocytes from human iPS cells in vitro, leading to a preliminary investigation of the mechanisms of human melanocyte differentiation. We generated iPS cell lines from human dermal fibroblasts using the Yamanaka factors (SOX2, OCT3/4, and KLF4, with or without c-MYC). These iPS cell lines were subsequently used to form embryoid bodies (EBs) and then differentiated into melanocytes via culture supplementation with Wnt3a, SCF, and ET-3. Seven weeks after inducing differentiation, pigmented cells expressing melanocyte markers such as MITF, tyrosinase, SILV, and TYRP1, were detected. Melanosomes were identified in these pigmented cells by electron microscopy, and global gene expression profiling of the pigmented cells showed a high similarity to that of human primary foreskin-derived melanocytes, suggesting the successful generation of melanocytes from iPS cells. This in vitro differentiation system should prove useful for understanding human melanocyte biology and revealing the mechanism of various pigment cell disorders, including melanoma.
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購買進(jìn)口儀器、試劑和耗材——就在始于2001年的畢特博生物
www.gducity.com |
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