Clonidine complexation with hydroxypropyl-beta-cyclodextrin: From physico-chemical characterization to in vivo adjuvant effect in local anesthesia

Autor(es)

Braga, M. A. ^[1] ; Martini, M. F. ^[2] ; Pickholz, M. ^[2] ; Yokaichiya, F. ^{[3, 4]} ; Franco, M. K. D. ^[3] ; Cabeca, L. F. ^[5] ; Guilherme, V. A. ^[1] ; Silva, C. M. G. ^[1] ; Limia, C. E. G. ^[1] ; de Paula, E. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Biochem & Tissue Biol Dept, Rua Monteiro Lobato 255, BR-13083862 Campinas, SP - Brazil

^[2] Univ Buenos Aires, Fac Pharm & Biochem, RA-1053 Buenos Aires, DF - Argentina

^[3] IPEN CNEN, Nucl & Energy Res Inst, Sao Carlos, SP - Brazil

^[4] Helmholtz Zentrum, Dept Quantum Phenomena Novel Mat, Berlin - Germany

^[5] Technol Fed Univ Parana, Londrina, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Pharmaceutical and Biomedical Analysis; v. 119, p. 27-36, FEB 5 2016.
• Citações Web of Science: 7

Resumo

Clonidine (CND), an alpha-2-adrenergic agonist, is used as an adjuvant with local anesthetics. In this work, we describe the preparation and characterization of an inclusion complex of clonidine in hydroxypropylbeta-cyclodextrin (HP-beta-CD), as revealed by experimental (UV-vis absorption, SEM, X-ray diffraction, DOSY- and ROESY-NMR) and theoretical (molecular dynamics) approaches. CND was found to bind to HP-beta-CD (K-a =20 M-1) in 1:1 stoichiometry. X-ray diffractograms and SEM images provided evidence of inclusion complex formation, which was associated with changes in the diffraction patterns of the pure compounds. NMR experiments revealed changes in the chemical shift of H3(HP-beta-CD) hydrogens (Delta=0.026 ppm) that were compatible with the insertion of CND in the hydrophobic cavity of the cyclodextrin. Molecular dynamics simulation with the three CND species that exist at pH 7.4 revealed the formation of intermolecular hydrogen bonds, especially for the neutral imino form of CND, which favored its insertion in the HP-beta-CD cavity. In vitro assays revealed that complexation retarded drug diffusion without changing the intrinsic toxicity of clonidine, while in vivo tests in rats showed enhanced sensory blockade after the administration of 0.15% CND, with the effect decreasing in the order: CND:HP-beta-CD + bupivacaine > CND + bupivacaine > bupivacaine > CND:HP-beta-CD > clonidine. The findings demonstrated the suitability of the complex for use as a drug delivery system for clinical use in antinociceptive procedures, in association with local anesthetics. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 06/00121-9 - Novas formulações de anestésicos locais de liberação controlada: do desenvolvimento ao teste clínico odontológico
• Beneficiário: Eneida de Paula
• Modalidade de apoio: Auxílio à Pesquisa - Temático