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Title: Site-specific microinjection of liposomes into the brain for local infusion of a short-lived peptide.
Authors: Barcellos, Neila Marcia Silva
Caligiorne, Sordaini Maria
Santos, Robson Augusto Souza dos
Frezard, Frederic Jean Georges
Keywords: Liposomes
Rostral ventrolateral medulla
Renin-angiotensin system
Issue Date: 2004
Citation: BARCELLOS, N. M. S. et al. Site-specific microinjection of liposomes into the brain for local infusion of a short-lived peptide. Journal Controlled Release, v. 95, p. 301-307, 2004. Disponível em: <>. Acesso em: 20 ago. 2014.
Abstract: The short-lived peptide, angiotensin-(1-7) (Ang-(1-7)), was encapsulated in different liposome preparations, in order to evaluate the influence of membrane fluidity, membrane surface, liposome size and dose of peptide on the cardiovascular effects of the encapsulated peptide at a specific site of the brain. These preparations were microinjected unilaterally into the rostral ventrolateral medulla (RVLM) of Wistar rats, and mean arterial blood pressure (MAP) and heart rate (HR) were registered by telemetry. Pegylated, rigid and calibrated (200 nm) liposomes, containing 50 ng of Ang-(1-7), elicited a significant increase of MAP for at least 7 days, in contrast to empty liposomes or non-pegylated liposomes. When a two-fold higher peptide dose was employed or when pegylated liposomes were used in the fluid state or uncalibrated, less pronounced pressor effects were observed. These data show that the cardiovascular responses to the microinjection of Ang-(1-7)- containing liposomes into the RVLM can be modulated through the manipulation of liposome characteristics. These results can be explained by the influence of liposome characteristics on the flux of peptide release. It is expected that this new method will encounter numerous applications in the study of the chronic actions of short-lived bioactive peptides in specific sites of the brain.
ISSN: 0168-3659
metadata.dc.rights.license: O periódico Journal Controlled Release concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3456621097721.
Appears in Collections:DEFAR - Artigos publicados em periódicos

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