Cultura de celulas vero sobre polimeros bioabsorviveis a base de poli(L-acido lactico)




Polymeric biomaterials are developed compounds used as substitutes for damaged tissue. A c1ass of biomaterials is the bioabsorbable ones, which are polymers that degrade in vitro as well as in vivo and are used in tissues that need a temporary support until its tissue regeneration happens. Among the several bioabsorbable polymers, the poly (L-acid lactic) [PLLA] based devices are eminent because their decomposition products are eliminated ITom the body by metabolic ways and due to their good biocompatibility. PLLA dense membranes or with different diameter pores (smaller than 45 Ilm, between 180-2501lm and 250-350Ilm) were evaluated by their ability of stimulating adhesion, growth and differentiation of tibroblastic cells in culture. We observed that the cells adhere slowly to the dense and porous PLLA membranes. Once adhered, they presented a differentiated morphological pattern in accordance with the substrate characteristics that they had grown. In ali the PLLA substrates studied, the cells were not on1y capable of proliferating over the substrates but also producing an extracellular matrix, rich in type IV collagen and tibronectin. We also evaluated the tibroblastic cells behavior over the different proportions blends of PLLA with poly(hydroxybutirate-co-hydroxyvalerate) [pHBV] (100/0, 60/40, 50/50, 40/60, 0/100). At the PLLA/PHBV blends, we also noticed a slowly cellular adhesion and a variable morphology according to the physical and surface substrate characteristics. We also observed that the substrate were capable of stimulating cell proliferation and the production of an extracellular matrix rich in type IV collagen and tibronectin. The results analysis show that the different PLLA based substrates studied, do not present toxicity, once the cells could differentiate over the different polymers, which was demonstrated by the production of an extracellular matrix rich in type IV collagen, an uncommon behavior to tibroblastic cells


polimeros bacterias produtoras de acido lactico celulas - cultura e meios de cultura celulas - diferenciação

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