Effects of freezing/thawing on the mechanical properties of decellularized lungs

Autor(es)

Nonaka, Paula N. ^{[1, 2, 3]} ; Campillo, Noelia ^{[4, 5, 1]} ; Uriarte, Juan J. ^{[4, 6, 1]} ; Garreta, Elena ^{[4, 6, 1]} ; Melo, Esther ^{[4, 6, 1]} ; de Oliveira, Luis V. F. ^{[2, 3]} ; Navajas, Daniel ^{[4, 5, 1]} ; Farre, Ramon ^{[4, 6, 1]}

Afiliação do(s) autor(es)

^[1] Univ Barcelona, Fac Med, Unitat Biofis & Bioengn, E-08007 Barcelona - Spain

^[2] Nove Julho Univ, Masters Degree Program Rehabil Sci, Sao Paulo - Brazil

^[3] Nove Julho Univ, Doctoral Degree Program Rehabil Sci, Sao Paulo - Brazil

^[4] CIBER Enfermedades Resp, Bunyola - Spain

^[5] Inst Bioengn Catalunya, Barcelona - Spain

^[6] Inst Invest Biomed August Pi Sunyer, Barcelona - Spain

• Tipo de documento: Artigo Científico
• Fonte: Journal of Biomedical Materials Research Part A; v. 102, n. 2, p. 413-419, FEB 2014.
• Citações Web of Science: 39

Resumo

Lung bioengineering based on decellularized organ scaffolds is a potential alternative for transplantation. Freezing/thawing, a usual procedure in organ decellularization and storage could modify the mechanical properties of the lung scaffold and reduce the performance of the bioengineered lung when subjected to the physiological inflation-deflation breathing cycles. The aim of this study was to determine the effects of repeated freezing/thawing on the mechanical properties of decellularized lungs in the physiological pressure-volume regime associated with normal ventilation. Fifteen mice lungs (C57BL/6) were decellularized using a conventional protocol not involving organ freezing and based on sodium dodecyl sulfate detergent. Subsequently, the mechanical properties of the acellular lungs were measured before and after subjecting them to three consecutive cycles of freezing/thawing. The resistance (R-L) and elastance (E-L) of the decellularized lungs were computed by linear regression fitting of the recorded signals (tracheal pressure, flow, and volume) during mechanical ventilation. R-L was not significantly modified by freezing-thawing: from 0.88 +/- 0.37 to 0.90 +/- 0.38 cmH(2)OsmL(-1) (mean +/- SE). E-L slightly increased from 64.4 +/- 11.1 to 73.0 +/- 16.3 cmH(2)OmL(-1) after the three freeze-thaw cycles (p = 0.0013). In conclusion, the freezing/thawing process that is commonly used for both organ decellularization and storage induces only minor changes in the ventilation mechanical properties of the organ scaffold. (c) 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 102A: 413-419, 2014. (AU)

• Processo FAPESP: 12/04052-2 - Resistência e complacência de pulmões descelularizados durante o processo de recelularização com células-tronco
• Beneficiário: Paula Naomi Nonaka
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado