Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery

Yin Duan,1,2 Lihui Wei,1–3 Julia Petryk,2,3 Terrence D Ruddy2,3 1Nordion Inc., 2Cardiac Positron Emission Tomography (PET) Radiochemistry Research Core Laboratory, Canadian Molecular Imaging Center of Excellence, University of Ottawa Heart Institute, 3Division of Cardiology, University of...

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Autores principales:	Duan Y, Wei L, Petryk J, Ruddy TD
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2016
Materias:	Hydrogenated soy phosphatidylcholine Cholesteryl hemisuccinate PEGylated liposome pH-triggered release Long in-vivo half-life Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/8b14ae4385d44a139394b11d06e1dfb1
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spelling	oai:doaj.org-article:8b14ae4385d44a139394b11d06e1dfb12021-12-02T06:31:49ZFormulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery1178-2013https://doaj.org/article/8b14ae4385d44a139394b11d06e1dfb12016-11-01T00:00:00Zhttps://www.dovepress.com/formulation-characterization-and-tissue-distribution-of-a-novel-ph-sen-peer-reviewed-article-IJNhttps://doaj.org/toc/1178-2013Yin Duan,1,2 Lihui Wei,1–3 Julia Petryk,2,3 Terrence D Ruddy2,3 1Nordion Inc., 2Cardiac Positron Emission Tomography (PET) Radiochemistry Research Core Laboratory, Canadian Molecular Imaging Center of Excellence, University of Ottawa Heart Institute, 3Division of Cardiology, University of Ottawa Heart Institute, Ottawa, ON, Canada Purpose: When designing liposome formulas for treatment and diagnostic purposes, two of the most common challenges are 1) the lack of a specific release mechanism for the encapsulated contents and 2) a short circulation time due to poor resistance to biological fluids. This study aimed to create a liposome formula with prolonged in vivo longevity and pH-sensitivity for cytoplasmic drug delivery. Materials and methods: Liposomal particles were generated using hydrogenated soy (HS) phosphatidylcholine, cholesteryl hemisuccinate (CHEM), polyethylene glycol (PEG) and diethylenetriaminepentaacetic acid-modified phosphatidylethanolamine with film hydration and extrusion methods. The physicochemical properties of the different formulas were characterized. pH-sensitivity was evaluated through monitoring release of encapsulated calcein. Stability of the radiolabeled liposomes was assessed in vitro through incubation with human serum. The best formula was selected and injected into healthy rats to assess tissue uptake and pharmacokinetics. Results: Liposomal particles were between 88 and 102 nm in diameter and negatively charged on the surface. Radiolabeling of all formulas with indium-111 was successful with good efficiency. 1%PEG-HS-CHEM not only responded to acidification very quickly but also underwent heavy degradation with serum. The 4%PEG-HS-CHEM, which exhibited both comparatively good pH-sensitivity (up to 20% release) and s.tisfactory stability (stability >70% after 24 h), was considered the best candidate for in vivo evaluation. Tissue distribution of 4%PEG-HS-CHEM was comparable to that of 4%PEG-HS-Chol, a long-circulating but pH-insensitive control, showing major accumulation in liver, spleen, intestine and kidneys. Analysis of blood clearance showed favorable half-life values: 0.6 and 14 h in fast and slow clearance phases, respectively. Conclusion: 4%PEG-HS-CHEM showed promising results in pH-sensitivity, serum stability, tissue uptake and kinetics and is a novel liposome formulation for multifunctional theranostic applications. Keywords: hydrogenated soy phosphatidylcholine, cholesteryl hemisuccinate, PEGylated liposome, pH-triggered release, long in vivo half-lifeDuan YWei LPetryk JRuddy TDDove Medical PressarticleHydrogenated soy phosphatidylcholineCholesteryl hemisuccinatePEGylated liposomepH-triggered releaseLong in-vivo half-lifeMedicine (General)R5-920ENInternational Journal of Nanomedicine, Vol Volume 11, Pp 5697-5708 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hydrogenated soy phosphatidylcholine Cholesteryl hemisuccinate PEGylated liposome pH-triggered release Long in-vivo half-life Medicine (General) R5-920
spellingShingle	Hydrogenated soy phosphatidylcholine Cholesteryl hemisuccinate PEGylated liposome pH-triggered release Long in-vivo half-life Medicine (General) R5-920 Duan Y Wei L Petryk J Ruddy TD Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
description	Yin Duan,1,2 Lihui Wei,1–3 Julia Petryk,2,3 Terrence D Ruddy2,3 1Nordion Inc., 2Cardiac Positron Emission Tomography (PET) Radiochemistry Research Core Laboratory, Canadian Molecular Imaging Center of Excellence, University of Ottawa Heart Institute, 3Division of Cardiology, University of Ottawa Heart Institute, Ottawa, ON, Canada Purpose: When designing liposome formulas for treatment and diagnostic purposes, two of the most common challenges are 1) the lack of a specific release mechanism for the encapsulated contents and 2) a short circulation time due to poor resistance to biological fluids. This study aimed to create a liposome formula with prolonged in vivo longevity and pH-sensitivity for cytoplasmic drug delivery. Materials and methods: Liposomal particles were generated using hydrogenated soy (HS) phosphatidylcholine, cholesteryl hemisuccinate (CHEM), polyethylene glycol (PEG) and diethylenetriaminepentaacetic acid-modified phosphatidylethanolamine with film hydration and extrusion methods. The physicochemical properties of the different formulas were characterized. pH-sensitivity was evaluated through monitoring release of encapsulated calcein. Stability of the radiolabeled liposomes was assessed in vitro through incubation with human serum. The best formula was selected and injected into healthy rats to assess tissue uptake and pharmacokinetics. Results: Liposomal particles were between 88 and 102 nm in diameter and negatively charged on the surface. Radiolabeling of all formulas with indium-111 was successful with good efficiency. 1%PEG-HS-CHEM not only responded to acidification very quickly but also underwent heavy degradation with serum. The 4%PEG-HS-CHEM, which exhibited both comparatively good pH-sensitivity (up to 20% release) and s.tisfactory stability (stability >70% after 24 h), was considered the best candidate for in vivo evaluation. Tissue distribution of 4%PEG-HS-CHEM was comparable to that of 4%PEG-HS-Chol, a long-circulating but pH-insensitive control, showing major accumulation in liver, spleen, intestine and kidneys. Analysis of blood clearance showed favorable half-life values: 0.6 and 14 h in fast and slow clearance phases, respectively. Conclusion: 4%PEG-HS-CHEM showed promising results in pH-sensitivity, serum stability, tissue uptake and kinetics and is a novel liposome formulation for multifunctional theranostic applications. Keywords: hydrogenated soy phosphatidylcholine, cholesteryl hemisuccinate, PEGylated liposome, pH-triggered release, long in vivo half-life
format	article
author	Duan Y Wei L Petryk J Ruddy TD
author_facet	Duan Y Wei L Petryk J Ruddy TD
author_sort	Duan Y
title	Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
title_short	Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
title_full	Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
title_fullStr	Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
title_full_unstemmed	Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
title_sort	formulation, characterization and tissue distribution of a novel ph-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery
publisher	Dove Medical Press
publishDate	2016
url	https://doaj.org/article/8b14ae4385d44a139394b11d06e1dfb1
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Formulation, characterization and tissue distribution of a novel pH-sensitive long-circulating liposome-based theranostic suitable for molecular imaging and drug delivery

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