Controllable continuous sub-tenon drug delivery of dexamethasone disodium phosphate to ocular posterior segment in rabbit.
Corticosteroids have been used for treatment of posterior segment eye diseases, but the delivery of drug to the posterior segments is still a problem to resolve. In our study, we explore the feasibility of Sub-tenon's Controllable Continuous Drug Delivery to ocular posterior segment. Controllable continuous sub-tenon drug delivery (CCSDD) system, intravenous injections (IV) and sub-conjunctival injections (SC) were used to deliver dexamethasone disodium phosphate (DEXP) in rabbits, the dexamethasone concentration was measured in the ocular posterior segment tissue by Shimadzu LC-MS 2010 system at different time points in 24 h after first dose injection. Levels of dexamethasone were significantly higher at 12, 24 h in CCSDD than two other approaches, and at 3, 6 h in CCSDD than IV in vitreous body (p < 0.01); at 6, 12, 24 h in CCSDD than two other approaches, and at 1, 3 h in CCSDD than IV in retinal/choroidal compound (p < 0.01); at 3, 6, 12, 24 h in CCSDD than two other approaches, and at 1 h in CCSDD than IV in sclera (p < 0.05). The AUC0-24in CCSDD group is higher than two other groups in all ocular posterior segment tissue. Our results demonstrated that dexamethasone concentration could be sustained moderately higher in the posterior segment by CCSDD than SC and IV, indicating that CCSDD might be a therapeutic alternative to treat a variety of intractable posterior segment diseases.
a Department of Ophthalmology, Changsha Aier Hospital , Changsha , China.|b Aier School of Ophthalmology, Central South University , Changsha , China , and.
Xuetao
X
Huang
c Advanced Research Center, Central South University , Changsha , China.
Shaogang
S
Liu
a Department of Ophthalmology, Changsha Aier Hospital , Changsha , China.|b Aier School of Ophthalmology, Central South University , Changsha , China , and.
Yezhen
Y
Yang
a Department of Ophthalmology, Changsha Aier Hospital , Changsha , China.|b Aier School of Ophthalmology, Central South University , Changsha , China , and.
Yiqin
Y
Duan
a Department of Ophthalmology, Changsha Aier Hospital , Changsha , China.|b Aier School of Ophthalmology, Central South University , Changsha , China , and.
Ding
D
Lin
D000287:Administration, Topical; D000818:Animals; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage / Q000378:metabolism; D003907:Dexamethasone / Q000008:administration & dosage* / Q000378:metabolism*; D016503:Drug Delivery Systems / Q000379:methods*; D005260:Female; D008297:Male; D011817:Rabbits; D011897:Random Allocation; D014822:Vitreous Body / Q000187:drug effects* / Q000378:metabolism*
D000893:Anti-Inflammatory Agents; D003907:Dexamethasone
Dexamethasone; pharmacokinetics; posterior segment; rabbit eye; sub-tenon drug delivery; topical administration