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Mariano KCF, Papini JZB, de Faria NC, Heluany DNC, Botega ALL, Cereda CMS, de Paula E, Tófoli GR, de Araujo DR. Ropivacaine-Loaded Poloxamer Binary Hydrogels for Prolonged Regional Anesthesia: Structural Aspects, Biocompatibility, and Pharmacological Evaluation. Biomed Res Int 2021; 2021:7300098. [PMID: 34568494 PMCID: PMC8460376 DOI: 10.1155/2021/7300098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 08/11/2021] [Accepted: 08/21/2021] [Indexed: 11/17/2022]
Abstract
This study reports the development of thermosensitive hydrogels for delivering ropivacaine (RVC), a wide clinically used local anesthetic. For this purpose, poloxamer- (PL-) based hydrogels were synthesized for evaluating the influence of polymer concentration, hydrophilic-lipophilic balances, and binary system formation on biopharmaceutical properties and pharmacological performance. Transition temperatures were shifted, and rheological analysis revealed a viscoelastic behavior with enhanced elastic/viscous modulus relationship (G'/G " = 1.8 to 22 times), according to hydrogel composition and RVC incorporation. The RVC release from PL407 and PL407/338 systems followed the Higuchi model (R 2 = 0.923-0.989), indicating the drug diffusion from hydrogels to the medium. RVC-PL hydrogels were potentially biocompatible evoking low cytotoxic effects (in fibroblasts and Schwann cells) and mild/moderate inflammation signs on sciatic nerve nearby histological evaluation. In vivo pharmacological assays demonstrated that PL407 and PL407/338 evoked differential analgesic effects, by prolonging the sensory blockade duration up to ~340 and 250 min., respectively. All those results highlighted PL407 and PL407/338 as promising new strategies for sustaining analgesic effects during the postoperative period.
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Affiliation(s)
| | | | | | | | | | - Cíntia Maria Saia Cereda
- São Leopoldo Mandic Faculty, São Leopoldo Mandic Research Institute, Campinas, São Paulo, Brazil
| | - Eneida de Paula
- Department of Biochemistry, State University of Campinas, Campinas, São Paulo, Brazil
| | - Giovana Radomille Tófoli
- São Leopoldo Mandic Faculty, São Leopoldo Mandic Research Institute, Campinas, São Paulo, Brazil
| | - Daniele Ribeiro de Araujo
- Human and Natural Sciences Center, Federal University of ABC, Santo André, SP, Brazil
- Drugs and Bioactives Delivery Systems Research Group–SISLIBIO, Federal University of ABC, Av. dos Estados, 5001 Bl. A, T3, Lab. 503-3. Bangú, Santo André, SP, Brazil
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