Abstract
Angiogenesis was identified as an early consequence of myc gene overexpression in two models of retroviral lymphomagenesis. Avian leukosis virus (ALV) induces bursal lymphoma in chickens after proviral c-myc gene integration, while the HB-1 retrovirus carries a v-myc oncogene and also induces metastatic lymphoma. Immunohistochemical studies of the effects of increased c-myc or v-myc overexpression revealed early angiogenesis within myc-transformed bursal follicles, which persisted in lymphomas and metastases. Abnormal vessel growth was consistently detected within 13 days after transplantation of a few myc-overexpressing progenitors into ablated bursal follicles, suggesting that these angiogenic changes may support the initial expansion of tumor precursors, as well as later stage lymphomagenesis. Conditioned media from myc-overexpressing B cell lines promoted proliferation of vascular endothelium in vitro, while media from B cells expressing low myc levels showed little effect. Moreover, ectopic myc overexpression in the low myc B cell lines increased production of the endothelial growth activity, indicating that myc induces secretion of angiogenic factors from B cells. These findings demonstrate that myc overexpression in lymphocytes generates an angiogenic phenotype in vitro as well as in vivo.
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Acknowledgements
We thank Drs Helene Sage, Patricia Parsons-Wingerter and Mark Groudine for their helpful suggestions, Andrei Tikhonenko for generously providing advice and tsp-1 analysis, and Kelly Bird, Sandra Jo Thomas and Gilbert Loring for technical assistance. This work was supported by NCI RO1 grant CA68328 to A Ruddell and NCI R01 grant CA20068 to P Neiman.
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Brandvold, K., Neiman, P. & Ruddell, A. Angiogenesis is an early event in the generation of myc-induced lymphomas. Oncogene 19, 2780–2785 (2000). https://doi.org/10.1038/sj.onc.1203589
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DOI: https://doi.org/10.1038/sj.onc.1203589
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