SEMA3A partially reverses VEGF effects through binding to neuropilin-1

SEMA3A partially reverses VEGF effects through binding to neuropilin-1

Author Palodetto, Bruna Google Scholar
Santos Duarte, Adriana da Silva Google Scholar
Lopes, Matheus Rodrigues Google Scholar
Corrocher, Flavia Adolfo Google Scholar
Roversi, Fernanda Marconi Google Scholar
Niemanni, Fernanda Soares Google Scholar
Vieira Ferro, Karla Priscila Google Scholar
Figueiredo Longhini, Ana Leda Google Scholar
Campos, Paula Melo Google Scholar
Favaro, Patricia Autor UNIFESP Google Scholar
Olalla Saad, Sara Teresinha Google Scholar
Abstract Cross-talk between hematopoietic stem cells (HSCs) and bone marrow stromal cells (BMSCs) is essential for HSCs regulation and leukemogenesis. Studying bone marrow of myelodysplasia patients, a pre-leukemic condition, we found mRNA overexpression of vascular endothelial growth factor A (VEGFA) in CD34+ HSCs and semaphorin 3A (SEMA3A) in BMSCs. To better understand the role of VEGFA and SEMA3A in leukemogenesis, werecruited 30myelodysplastic syndrome(MDS) patients, 29 acutemyeloid leukemia (6 secondary toMDS) patients and 12 controls. We found higher VEGFA expression in de novo AML patients (without priorMDS) group (p = 0.0073) and higher SEMA3A expression in all BMSCs patient's samples compared to control group. We then overexpressed VEGFA in an acute myelogenous leukemia cell line, KG1 cells, and in normal CD34(+) cells. This overexpression increased KG1 (p = 0.045) and CD34+ cell (p = 0.042) viability and KG1 (p = 0.042) and CD34(+) cell (p= 0.047) proliferation. Moreover, KG1 and CD34+ cells overexpressing VEGFA also had increased proliferation when co-cultured with human marrow stromal HS5 cells (p= 0.045 and p = 0.02, respectively). However, co-culture of these transformed cells with HS5 cells overexpressing SEMA3A reduced KG1 (p = 0.004) and CD34(+) (p= 0.009) proliferation. Co-culture of KG1 transformed cellswith HS27 cells overexpressing SEMA3A reduced KG1 proliferation as well (p= 0.01). To investigate whether the dominant SEMA3A effect over VEGFA could be due to competition for neuropilin1 receptor (NRP1), we performed immunoprecipitation with anti-NRP1 antibody of cell extracts of co-cultured KG1 and HS5 cells, induced or not by VEGFA and SEMA3A recombinant proteins. Results showed a preferential association of NRP1 with SEMA3A, suggesting that SEMA3A can partially reverse the effects caused by the VEGFA preventing its binding with the NRP1 receptor. Since both hematopoietic cells, leukemic and normal, showed similar behavior, we suppose that the attempt to reversion of VEGF effects by SEMA3A is a homeostatic phenomenon in the hematopoietic niche. Finally, we conclude that VEGFA overexpression confers AML cell advantages and SEMA3A may partially reverse this effect

thus, SEMA3A protein combined with VEGFA inhibitors could be beneficial for AML treatment. (C) 2017 The Authors. Published by Elsevier B.V.
Keywords VEGFA
xmlui.dri2xhtml.METS-1.0.item-coverage Amsterdam
Language English
Sponsor Conselho Nacional de Desenvolvimento CientIfico e Tecnologico
Fundacao de Amparo a Pesquisa do Estado de Sao Paulo
Grant number CNPq/MCT: 15/2008565036/2010-6
FAPESP: 2012/0529-9
FAPESP: 2011/51959-0
Date 2017
Published in Stem Cell Research. Amsterdam, v. 22, p. 70-78, 2017.
ISSN 1873-5061 (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Bv
Extent 70-78
Access rights ACESSO ABERTO
Type Article
Web of Science ID WOS:000405469000010

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