The report summarizes the work of our laboratory aimed at improving the understanding of the angiogenic response of adult tissues, an event that transforms a micro-embolus of neoplastic cells into a growing metastasis. Attention has been focused on tumor-induced angiogenesis. The following aspects of the subject are discussed: (a) relationship between size of vascular network and tumor growth rate or tumor cell population; (b) angiogenic capacity of tumors and role that prostaglandin E1 may have as an angiogenesis factor; (c) relationship between acquisition of angiogenic capacity and neoplastic transformation of a cell population; (d) modification of tissue composition at the onset of angiogenesis; (e) behaviour of copper ions and copper carriers in the course of the angiogenic response; (f) the influence of gangliosides on endothelial cell motility, survival and growth in vitro; (g) modulation of the angiogenic response by gangliosides (GM1, GT1b) in vivo.
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