Wnt5a induces ROR1 to complex with HS1 to enhance migration of chronic lymphocytic leukemia cells

ROR1 (receptor tyrosine kinase-like orphan receptor 1) is a conserved, oncoembryonic surface antigen expressed in chronic lymphocytic leukemia (CLL). We found that ROR1 associates with hematopoietic-lineage-cell-specific protein 1 (HS1) in freshly isolated CLL cells or in CLL cells cultured with exo...

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Veröffentlicht in:Leukemia 2017-12, Vol.31 (12), p.2615-2622
Hauptverfasser: Hasan, M K, Yu, J, Chen, L, Cui, Bing, Widhopf II, G F, Rassenti, L, Shen, Z, Briggs, S P, Kipps, T J
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container_end_page 2622
container_issue 12
container_start_page 2615
container_title Leukemia
container_volume 31
creator Hasan, M K
Yu, J
Chen, L
Cui, Bing
Widhopf II, G F
Rassenti, L
Shen, Z
Briggs, S P
Kipps, T J
description ROR1 (receptor tyrosine kinase-like orphan receptor 1) is a conserved, oncoembryonic surface antigen expressed in chronic lymphocytic leukemia (CLL). We found that ROR1 associates with hematopoietic-lineage-cell-specific protein 1 (HS1) in freshly isolated CLL cells or in CLL cells cultured with exogenous Wnt5a. Wnt5a also induced HS1 tyrosine phosphorylation, recruitment of ARHGEF1, activation of RhoA and enhanced chemokine-directed migration; such effects could be inhibited by cirmtuzumab, a humanized anti-ROR1 mAb. We generated truncated forms of ROR1 and found its extracellular cysteine-rich domain or kringle domain was necessary for Wnt5a-induced HS1 phosphorylation. Moreover, the cytoplamic, and more specifically the proline-rich domain (PRD), of ROR1 was required for it to associate with HS1 and allow for F-actin polymerization in response to Wnt5a. Accordingly, we introduced single amino acid substitutions of proline (P) to alanine (A) in the ROR1 PRD at positions 784, 808, 826, 841 or 850 in potential SH3-binding motifs. In contrast to wild-type ROR1, or other ROR1 P→A mutants, ROR1 P(841)A had impaired capacity to recruit HS1 and ARHGEF1 to ROR1 in response to Wnt5a. Moreover, Wnt5a could not induce cells expressing ROR1 P(841)A to phosphorylate HS1 or activate ARHGEF1, and was unable to enhance CLL-cell motility. Collectively, these studies indicate HS1 plays an important role in ROR1-dependent Wnt5a-enhanced chemokine-directed leukemia-cell migration.
doi_str_mv 10.1038/leu.2017.133
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We found that ROR1 associates with hematopoietic-lineage-cell-specific protein 1 (HS1) in freshly isolated CLL cells or in CLL cells cultured with exogenous Wnt5a. Wnt5a also induced HS1 tyrosine phosphorylation, recruitment of ARHGEF1, activation of RhoA and enhanced chemokine-directed migration; such effects could be inhibited by cirmtuzumab, a humanized anti-ROR1 mAb. We generated truncated forms of ROR1 and found its extracellular cysteine-rich domain or kringle domain was necessary for Wnt5a-induced HS1 phosphorylation. Moreover, the cytoplamic, and more specifically the proline-rich domain (PRD), of ROR1 was required for it to associate with HS1 and allow for F-actin polymerization in response to Wnt5a. Accordingly, we introduced single amino acid substitutions of proline (P) to alanine (A) in the ROR1 PRD at positions 784, 808, 826, 841 or 850 in potential SH3-binding motifs. 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identifier ISSN: 0887-6924
ispartof Leukemia, 2017-12, Vol.31 (12), p.2615-2622
issn 0887-6924
1476-5551
language eng
recordid cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_5670028
source MEDLINE; Springer Nature - Complete Springer Journals; Nature Journals Online
subjects 13/95
14
14/19
631/45/612/1243
631/67/1990/283/1895
631/80/84
631/80/86
692/420/755
82
82/58
Actin
Alanine
Amino Acid Sequence
Amino acids
Analysis
Blood Proteins - chemistry
Blood Proteins - metabolism
Cancer Research
Care and treatment
Cell adhesion & migration
Cell migration
Cell Movement - immunology
Chemokines
Chemokines - metabolism
Chronic lymphocytic leukemia
Critical Care Medicine
Diagnosis
Hematology
Humans
Intensive
Internal Medicine
Leukemia
Leukemia, Lymphocytic, Chronic, B-Cell - immunology
Leukemia, Lymphocytic, Chronic, B-Cell - metabolism
Lymphatic leukemia
Medicine
Medicine & Public Health
Microscopy
Monoclonal antibodies
Multiprotein Complexes - metabolism
Mutants
Oncology
Original
original-article
Phosphorylation
Polymerization
Proline
Protein Binding
Protein Interaction Domains and Motifs
Protein-tyrosine kinase receptors
Receptor Tyrosine Kinase-like Orphan Receptors - chemistry
Receptor Tyrosine Kinase-like Orphan Receptors - metabolism
Rho Guanine Nucleotide Exchange Factors - metabolism
rhoA GTP-Binding Protein - metabolism
RhoA protein
Tumor Cells, Cultured
Tyrosine
Wnt protein
Wnt-5a Protein - metabolism
title Wnt5a induces ROR1 to complex with HS1 to enhance migration of chronic lymphocytic leukemia cells
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