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de Andrade Pinto SA, de Nadai Dias FJ, Brasil Camargo Cardoso G, Dos Santos Junior AR, de Aro AA, Pino DS, Meneghetti DH, Vitti RP, Dos Santos GMT, de Carvalho Zavaglia CA. Polycaprolactone/Beta-Tricalcium Phosphate Scaffolds Obtained via Rotary Jet-Spinning: in vitro and in vivo Evaluation. Cells Tissues Organs 2021; 211:477-491. [PMID: 33691307 DOI: 10.1159/000511570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/10/2020] [Indexed: 11/19/2022] Open
Abstract
This study aimed to evaluate in vitro and in vivo polymeric membranes obtained by a rotary jet-spinning process for the repair of critical bone defects in the calvaria of Wistar rats, for future use in tissue engineering. Experimental sample collections were performed on the 30, 60 and 90th postoperative days, and the analyses performed were histomorphometric, immunohistochemistry, and western blotting. Reducing inflammatory infiltrate in all groups and experimental periods, angiogenesis on the 30th day did not show any difference between the groups, on the 60th day, 5% polycaprolactone/beta-tricalcium phosphate(PCL/β-TCP) was high compared to control (C), and on the 90th day, the same group reduced when compared to C and 10% PCL/β-TCP. The fibroplasia presented oscillations in every segment; on the 30th and 60th day, there was an increase in 5% PCL/β-TCP, which decreased by the 90th day compared to group C. 10% PCL/β-TCP decreased compared to C on the 60th and 90th day. The percentage of the collagen area remained high in all groups and all experimental periods. Immunohistochemistry quantifications showed variations in bone metabolism suggesting new bone formation. The 5 and 10% PCL/β-TCP scaffold were promising for the bone regeneration process because they participated in the modulation of inflammation, angiogenesis, fibroplasia, and collagenosis.
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Affiliation(s)
- Stella Aparecida de Andrade Pinto
- Department of Materials Engineering, University of Campinas, Campinas, Brazil, .,School of Dentistry, Herminio Ometto University Center, Araras, Brazil,
| | - Francisco José de Nadai Dias
- Department of Materials Engineering, University of Campinas, Campinas, Brazil.,School of Dentistry, Herminio Ometto University Center, Araras, Brazil
| | | | | | - Andréa Aparecida de Aro
- School of Dentistry, Herminio Ometto University Center, Araras, Brazil.,Graduate Program of Biomedical Sciences, Herminio Ometto University Center, Araras, Brazil
| | - Danilo Siqueira Pino
- Department of Materials Engineering, University of Campinas, Campinas, Brazil.,School of Dentistry, Herminio Ometto University Center, Araras, Brazil
| | - Damaris Helena Meneghetti
- School of Dentistry, Herminio Ometto University Center, Araras, Brazil.,Graduate Program of Biomedical Sciences, Herminio Ometto University Center, Araras, Brazil
| | - Rafael Pino Vitti
- School of Dentistry, Herminio Ometto University Center, Araras, Brazil
| | - Gláucia Maria Tech Dos Santos
- School of Dentistry, Herminio Ometto University Center, Araras, Brazil.,Graduate Program of Biomedical Sciences, Herminio Ometto University Center, Araras, Brazil
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Daquila BV, Scudeler EL, Dossi FCA, Moreira DR, Pamphile JA, Conte H. Action of Bacillus thuringiensis (Bacillales: Bacillaceae) in the midgut of the sugarcane borer Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 184:109642. [PMID: 31539808 DOI: 10.1016/j.ecoenv.2019.109642] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 08/07/2019] [Accepted: 09/03/2019] [Indexed: 06/10/2023]
Abstract
The relevance of Bacillus thuringiensis in pest control strategies have been increasing in recent decades. This entomopathogenic microorganism is considered safe, and its action is highly selective to target organisms. Its toxic effect is attributed to the toxins synthesized during sporulation. The nature of the produced toxins depends on the bacterial variety. Some varieties of B. thuringiensis can synthesize from one to eight distinct toxins, which have specific effects on different orders of susceptible insects. The sugarcane borer, Diatraea saccharalis, is a holometabolous lepidopteran that causes severe damage to sugar cane cultures during its larval phase. Therefore, to evaluate B. thuringiensis serovar Aizawai GC-91 efficiency and its effects on the midgut of first instar D. saccharalis larvae, we reared the insects with contaminated artificial diet for 144 h. Larvae mortality during this period revealed that 5, 10, and 20 g/L concentrations were the most efficient, resulting in 100% mortality of treated larvae, with LC50 and LC90 estimated at 0.307 and 1.330 g/L, respectively. Furthermore, histological and ultrastructural analyses revealed damage to midgut cells. Within the first 24 h of treatment, the midgut of infected insects presented peritrophic membrane degeneration, cytoplasmic vacuolization, and cellular hypertrophy; spherites and calcium granules were also observed. At 48 h of treatment, the digestive system had collapsed, with microvilli degeneration, basement membrane and muscular fiber bundles disruption, and cellular lysis. These results confirm the toxicity of the B. thuringiensis serovar Aizawai GC-91 on D. saccharalis larvae and its potential use as a biocontroller against this pest species.
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Affiliation(s)
- Bruno Vinicius Daquila
- Laboratory of Biological Control, Morphology and Insect Cytogenetics, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá - UEM, Maringá, PR, 87020-900, Brazil.
| | - Elton Luiz Scudeler
- Laboratory of Insects, Department of Morphology, Institute of Biosciences of Botucatu, São Paulo State University - UNESP, Botucatu, SP, 18618-689, Brazil
| | - Fábio Cleisto Alda Dossi
- Microscopy Center, Complex of Research Support Centers of the State University of Maringá - UEM, Maringá, PR, 87020-900, Brazil
| | - Daiani Rodrigues Moreira
- Laboratory of Animal Genetics, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá - UEM, Maringá, PR, 87020-900, Brazil
| | - João Alencar Pamphile
- Laboratory of Microbiology, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá - UEM, Maringá, PR, 87020-900, Brazil
| | - Helio Conte
- Laboratory of Biological Control, Morphology and Insect Cytogenetics, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá - UEM, Maringá, PR, 87020-900, Brazil.
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