Decellularized bovine cotyledons may serve as biological scaffolds with preserved vascular arrangement

Author(s)

Nunes Barreto, Rodrigo da Silva ^[1] ; Romagnolli, Patricia ^[1] ; Mess, Andrea Maria ^[1] ; Miglino, Maria Angelica ^[1]

Affiliation

^[1] Univ Sao Paulo, Ave Prof Orlando Marques de Paiva 87, BR-05508270 Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF TISSUE ENGINEERING AND REGENERATIVE MEDICINE; v. 12, n. 4, p. E1880-E1888, APR 2018.
• Web of Science Citations: 5

Abstract

Technically produced scaffolds are common to establish transplantable tissues for regenerative medicine, but also biological ones that are closer to the natural condition become of interest. Placentas are promising, because they represented available, complete organs with rich extracellular matrix (ECM) and well-developed vasculature that easily could build anastomoses to a host's organ. Only placentas from larger animal models such as the bovine meet the dimensions large enough for most organs but are not adequately described yet. We here studied the nature of the ECM in 27 natural and decellularized bovine cotyledons, that is, the fetal part of the placentomes, by means of histology, immunohistochemistry, and electron microscopy. Successful decellularization was done by perfusion with 0.01%, 0.1%, and 0.5% sodium dodecyl sulfate each and subsequent immersion in 1% Triton X-100, resulting in a removal of cells and DNA, whereas the structure of the allantochorionic surface and villi was preserved. Although some fibres disappeared, also the arrangement of the main ECM proteins was largely similar before and after decellularization: Along the larger vessels, a densely packed network of thick fibres occurred, organized in layers without cells or spaces in between. Collagen IV, fibronectin, and laminin contributed to those areas. In contrast, collagen I and III characterized the meshwork of medium-sized and thin fibres in the mesenchyme, respectively. In conclusion, decellularized bovine cotyledons indeed had characteristics of a biological scaffold and provide an interesting alternative to develop large-scale scaffolds with complex vascular architecture for tissue engineering purposes. (AU)

• FAPESP's process: 15/22350-9 - Extracellular matrix in different types of mammalian placentation
• Grantee: Maria Angelica Miglino
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• FAPESP's process: 15/14535-9 - Structural, molecular and proteic remodelation of placental extracellular matrix in bovine cloned pregnancies
• Grantee: Rodrigo da Silva Nunes Barreto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral