Abstract
It is now well established that angiogenesis in multiple myeloma (MM) is associated with poor prognosis. The exact function of the newly formed vessels in MM is, however, a matter of debate. It is believed that, in contrast to solid tumor growth, the bone marrow (BM) is a sufficiently vascularized organ to support expansion of the MM clone with no need for additional blood vessels. From this point of view, it could be that MM-associated angiogenesis is rather an epiphenomenon and that the newly formed microvessels form a chaotic network that does not contribute to the blood flow. We investigated whether these newly formed microvessels in MM are connected to the blood circulation. The intravenously injected ferritin 30 min prior to sacrifice was detected in 100% of the BM vessels of control mice. In MM-bearing mice, the ferritin tracer was found in 31% of the MM-associated vessels, indicating a connection with the peripheral blood circulation in these vessels. We conclude that, comparable to the situation in solid tumors, at least part of the tumor-associated microvessels in MM is functionally connected to the blood circulation and, therefore, can participate in the transport of nutrients and in the dissemination of MM cells.
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Acknowledgements
This work was supported by the Fund for Scientific Research—Flanders (Belgium), G.0330.02 (F.W.O.-Vlaanderen), Kom op tegen Kanker, Onderzoeksraad VUB, the International Myeloma Foundation Ashley Barit Research Grant (K.A.), and the Multiple Myeloma Research Foundation (K.V.). Hendrik De Raeve has a Clinical Doctoral Grant from F.W.O.—Vlaanderen, and Kewal Asosingh and Karin Vanderkerken are postdoctoral fellows of F.W.O.—Vlaanderen. We thank Professor Floris Wuyts for the statistical analysis and Dr. Ivan Van Riet for the critical reading of the manuscript. We thank Marijke Baekeland, Carine Seynaeve, Daniëlle Blijweert, Gunther Vrolix and Angelo Willems for skilled technical assistance.
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De Raeve, H.R., Asosingh, K., Wisse, E. et al. Part of the multiple myeloma-associated microvessels is functionally connected to the systemic circulation: a study in the murine 5T33MM model. Virchows Arch 445, 389–395 (2004). https://doi.org/10.1007/s00428-004-1064-7
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DOI: https://doi.org/10.1007/s00428-004-1064-7