ALK(R1275Q) perturbs extracellular matrix, enhances cell invasion and leads to the development of neuroblastoma in cooperation with MYCN

Oncogene
T UedaH Honda

Abstract

Overexpression of MYCN is a hallmark of neuroblastoma (NB). ALK(R1275Q), an activating mutation of ALK (anaplastic lymphoma kinase), has been found in sporadic and familial NB patients. In this report, we demonstrated that ALK(R1275Q) knock-in, MYCN transgenic compound mice developed NB with complete penetrance. Transcriptome analysis revealed that ALK(R1275Q) globally downregulated the expression of extracellular matrix (ECM)- and basement membrane (BM)-associated genes in both primary neuronal cells and NB tumors. Accordingly, ALK(R1275Q)/MYCN tumors exhibited reduced expression of ECM/BM-related proteins as compared with MYCN tumors. In addition, on MYCN transduction, ALK(R1275Q)-expressing neuronal cells exhibited increased migratory and invasive activities. Consistently, enhanced invasion and metastasis were demonstrated in ALK(R1275Q)/MYCN mice. These results collectively indicate that ALK(R1275Q) confers a malignant potential on neuronal cells that overexpress MYCN by impairing normal ECM/BM integrity and enhancing tumor growth and dissemination. Moreover, we found that crizotinib, an ALK inhibitor, almost completely inhibited the growth of ALK(R1275Q)/MYCN tumors in an allograft model. Our findings provided insights int...Continue Reading

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Dec 12, 2017·Frontiers in Immunology·Thanh-Phuong Le, To-Ha Thai
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