Vascular endothelial growth factor overexpression positively modulates the characteristics of periprosthetic tissue of polyurethane-coated silicone breast implant in rats.

Abstract:

BACKGROUND:Capsular contracture is one of the most common complications associated with silicone breast implants. The surface of the implant is one of the factors often associated with the occurrence of capsular contracture. In this study, the authors evaluated the differences in morphologic and molecular characteristics of the capsule formed around polyurethane-coated versus textured-surface silicone implants in rats, mainly the modifications in angiogenesis and the expression of vascular endothelial growth factor (VEGF). METHODS:A pocket was performed on the animal's back, where the silicone implants were introduced. Two groups of animals received a polyurethane-coated silicone implant and the other groups received a textured-surface silicone implant, and the capsules around the prostheses were submitted to histologic and immunohistochemistry analysis, 30 or 90 days after surgery. RESULTS:The capsules around the polyurethane-coated silicone prostheses were significantly thicker than the textured-surface silicone implants. Furthermore, the layer adjacent to the polyurethane-coated silicone implants was more cellular and irregular than the layer around the textured-surface silicone implants. Textured implant periprosthetic capsules presented fewer inflammatory cells and less vascularization than the polyurethane-coated silicone implants. The collagen layer of periprosthetic tissue of textured implants appears to be more continuous and aligned in parallel fashion than polyurethane-coated implants. Immunohistochemical analysis revealed high levels of transforming growth factor-β and VEGF in the capsules around the polyurethane-coated silicone implants when compared with the textured-surface silicone implants. CONCLUSION:These findings suggest that the intense VEGF expression in capsules around the polyurethane-coated silicone implant is able to improve the tissue vascularization, resulting in a softer capsule compared with the textured-surface silicone implant.

journal_name

Plast Reconstr Surg

authors

Vieira VJ,d'Acampora AJ,Marcos ABW,Di Giunta G,de Vasconcellos ZAA,Bins-Ely J,d'Eça Neves R,Figueiredo CP

doi

10.1097/PRS.0b013e3181f446d5

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

1899-1910

issue

6

eissn

0032-1052

issn

1529-4242

pii

00006534-201012000-00012

journal_volume

126

pub_type

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