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Lipoma is one of the most common benign mesenchymal tumors. Its ability to trigger an angiogenic response is a critical step for its growth. Because adipose tissue serves as an important conduit for the vasculature, it is conceivable that the angiogenic properties of this tissue may modulate the growth of the vasculature in a paracrine manner. We investigated in vivo the angiogenic potential of bioptic fragments of human lipoma by using the chick embryo chorioallantoic membrane (CAM), a useful model for such an investigation. The angiogenic response in pathological and control implants was assessed on histologic sections by a morphometric method, 96 h after grafting. Results showed that pathological samples were surrounded by numerous allantoic vessels with a radially arranged pattern around the implant. The vascular counts in the CAMs treated with lipoma implants were comparable to that of FGF-2. The role played in vasoproliferative response by angiogenic cytokines (FGF-2, VEGF) released by adipocytes, by endogenous cytokines, such as FGF-2, stored in the CAM extracellular matrix and by angiogenic growth factors released by perivascular mononuclear cells around the newly-formed blood vessels, were supported by this study.
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