TY - JOUR

T1 - Mucoadhesive cholesterol-chitosan self-assembled particles for topical ocular delivery of dexamethasone

AU - Dubashynskaya, Natallia V.

AU - Golovkin, Alexey S.

AU - Kudryavtsev, Igor V.

AU - Prikhodko, Stanislava S.

AU - Trulioff, Andrey S.

AU - Bokatyi, Anton N.

AU - Poshina, Daria N.

AU - Raik, Sergei V.

AU - Skorik, Yury A.

N1 - Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/9/1

Y1 - 2020/9/1

N2 - The topical application of ophthalmic drugs is a convenient and safe mode of drug administration. However, the bioavailability of topical drugs in the eye is low due to eye barriers and the rapid removal of the drug from the conjunctival surface by the tear fluid. The aim of this study was to obtain dexamethasone-loaded mucoadhesive self-assembled particles based on a conjugate of succinyl cholesterol with chitosan (SC-CS) for potential use as a topical ocular formulation. SC-CS was obtained via a carbodiimide-mediated coupling reaction (degree of substitution DS 1.2–5.8%). SC-CS in the DS range of 1.2–3.0% can self-organize in solution to form positively charged particles (ζ-potential 20–37 mV) of submicron size (hydrodynamic diameter 700–900 nm). The SC-CS particles show good mucoadhesiveness, which decreases with increasing DS. The obtained particles can encapsulate 159–170 μg/mg dexamethasone; they release about 50% of drug in 2 h, and the cumulative drug release reached 95% in 24 h. A cell model confirmed that dexamethasone-loaded SC-CS particles are non-cytotoxic and exhibit a comparable anti-inflammatory activity to that of pure dexamethasone. Testing the osmotic resistance of erythrocytes showed that both dexamethasone-loaded and non-loaded SC-CS particles have greater membrane-stabilizing ability than that of dexamethasone.

AB - The topical application of ophthalmic drugs is a convenient and safe mode of drug administration. However, the bioavailability of topical drugs in the eye is low due to eye barriers and the rapid removal of the drug from the conjunctival surface by the tear fluid. The aim of this study was to obtain dexamethasone-loaded mucoadhesive self-assembled particles based on a conjugate of succinyl cholesterol with chitosan (SC-CS) for potential use as a topical ocular formulation. SC-CS was obtained via a carbodiimide-mediated coupling reaction (degree of substitution DS 1.2–5.8%). SC-CS in the DS range of 1.2–3.0% can self-organize in solution to form positively charged particles (ζ-potential 20–37 mV) of submicron size (hydrodynamic diameter 700–900 nm). The SC-CS particles show good mucoadhesiveness, which decreases with increasing DS. The obtained particles can encapsulate 159–170 μg/mg dexamethasone; they release about 50% of drug in 2 h, and the cumulative drug release reached 95% in 24 h. A cell model confirmed that dexamethasone-loaded SC-CS particles are non-cytotoxic and exhibit a comparable anti-inflammatory activity to that of pure dexamethasone. Testing the osmotic resistance of erythrocytes showed that both dexamethasone-loaded and non-loaded SC-CS particles have greater membrane-stabilizing ability than that of dexamethasone.

KW - Anti-inflammatory activity

KW - Cholesterol-chitosan

KW - Dexamethasone

KW - Mucoadhesion

KW - Ocular drug delivery

KW - Self-assembled particles

UR - http://www.scopus.com/inward/record.url?scp=85084415001&partnerID=8YFLogxK

U2 - 10.1016/j.ijbiomac.2020.04.251

DO - 10.1016/j.ijbiomac.2020.04.251

M3 - Article

C2 - 32371131

VL - 158

SP - 811

EP - 818

JO - International Journal of Biological Macromolecules

JF - International Journal of Biological Macromolecules

SN - 0141-8130

ER -