Joseph Nancy M, Mosher Jack T, Buchstaller Johanna, Snider Paige, McKeever Paul E, Lim Megan, Conway Simon J, Parada Luis F, Zhu Yuan, Morrison Sean J
Center for Stem Cell Biology, Howard Hughes Medical Institute, Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA.
Cancer Cell. 2008 Feb;13(2):129-40. doi: 10.1016/j.ccr.2008.01.003.
Neurofibromatosis is caused by the loss of neurofibromin (Nf1), leading to peripheral nervous system (PNS) tumors, including neurofibromas and malignant peripheral nerve sheath tumors (MPNSTs). A long-standing question has been whether these tumors arise from neural crest stem cells (NCSCs) or differentiated glia. Germline or conditional Nf1 deficiency caused a transient increase in NCSC frequency and self-renewal in most regions of the fetal PNS. However, Nf1-deficient NCSCs did not persist postnatally in regions of the PNS that developed tumors and could not form tumors upon transplantation into adult nerves. Adult P0a-Cre+Nf1(fl/-) mice developed neurofibromas, and Nf1(+/-)Ink4a/Arf(-/-) and Nf1/p53(+/-) mice developed MPNSTs, but NCSCs did not persist postnatally in affected locations in these mice. Tumors appeared to arise from differentiated glia, not NCSCs.
神经纤维瘤病由神经纤维瘤蛋白(Nf1)缺失引起,可导致外周神经系统(PNS)肿瘤,包括神经纤维瘤和恶性外周神经鞘瘤(MPNST)。长期以来的一个问题是,这些肿瘤是源自神经嵴干细胞(NCSC)还是分化的神经胶质细胞。胚系或条件性Nf1缺陷导致胎儿PNS大多数区域的NCSC频率和自我更新短暂增加。然而,Nf1缺陷的NCSC在出生后不会在PNS中发生肿瘤的区域持续存在,并且在移植到成年神经中时无法形成肿瘤。成年P0a-Cre+Nf1(fl/-)小鼠会发生神经纤维瘤,Nf1(+/-)Ink4a/Arf(-/-)和Nf1/p53(+/-)小鼠会发生MPNST,但NCSC在出生后不会在这些小鼠的受影响部位持续存在。肿瘤似乎源自分化的神经胶质细胞,而非NCSC。
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