In vivo biocompatibility and biodegradability of poly(lactic acid)/poly(ϵ-caprolactone) blend compatibilized with poly(ϵ-caprolactone-b-tetrahydrofuran) in Wistar rats

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Conde, Gabriel [UNESP]
De Carvalho, Júlia Ribeiro Garcia [UNESP]
Dias, Paula Do Patrocínio
Moranza, Henriette Gellert [UNESP]
Montanhim, Gabriel Luiz [UNESP]
Ribeiro, Juliana De Oliveira [UNESP]
Chinelatto, Marcelo Aparecido
Moraes, Paola Castro [UNESP]
Taboga, Sebasti o Roberto [UNESP]
Bertolo, Paulo Henrique Leal [UNESP]

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Poly(lactic acid) (PLA) and poly(ϵ-caprolactone) (PCL) are two important aliphatic esters known for their biodegradability and bioresorbability properties; the former is stiffer and brittle while the smaller modulus of the latter allows a suitable elongation. The new biomaterials being developed from the blend of these two polymers (PLA and PCL) is opportune due to the reducing interfacial tension between their immiscible phases. In a previous study, PLA/PCL immiscible blend when compatibilized with poly(ϵ-caprolactone-b-tetrahydrofuran) resulted in enhanced ductility and toughness no cytotoxic effect in vitro tests. There is little published data on the effect of poly(ϵ-caprolactone-b-tetrahydrofuran) on PLA and PCL biocompatibility and biodegradability in vivo tests. This study focuses on evaluating the behavioral response and polymer-tissue interaction of compatibilized PLA/PCL blend compared to neat PLA implanted via intraperitoneal (IP) and subcutaneous (SC) in male Wistar rats, distributed in four experimental groups: neat PLA, PLA/PCL blend, sham, and control at 2-, 8- and 24-weeks post-implantation (WPI). An open-field test was performed to appraise emotionality and spontaneous locomotor activity. Histopathological investigation using hematoxylin-eosin (H&E) and picrosirius-hematoxylin (PSH) was used to assess polymer-tissue interaction. Modifications in PLA and the PLA/PCL blend's surface morphology were determined by scanning electron microscopy (SEM). PLA group defecated more often than PLA/PCL rats 2 and 8 WPI. Conjunctive capsule development around implants, cell adhesion, angiogenesis, and giant cells of a foreign body to the biomaterial was observed in light microscopy. Both groups displayed a fibrous reaction along with collagen deposition around the biomaterials. In the SEM, the images showed a higher degradation rate for the PLA/PCL blend in both implantation routes. The polymers implanted via IP exhibited a higher degradation rate compared to SC. These findings emphasize the biocompatibility of the PLA/PCL blend compatibilized with poly(ϵ-caprolactone-b-tetrahydrofuran), making this biopolymer an acceptable alternative in a variety of biomedical applications.



biodegradable, biodegradation, compatibilization, heatmap, open-field, PCL

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Biomedical Physics and Engineering Express, v. 7, n. 3, 2021.