期刊
JOURNAL OF CONTROLLED RELEASE
卷 224, 期 -, 页码 69-76出版社
ELSEVIER
DOI: 10.1016/j.jconrel.2015.12.044
关键词
Intranasal; Ziconotide; Cerebrospinal fluid; In situ gels
资金
- National Institute of Neurological Disorders and Stroke (NINDS) Grant [NS074362]
- Institutional Development Award (IDeA) Grant from the National Institute of General Medical Sciences (NIGMS) [P20GM104932]
- National Science Foundation [DMR-1352572, EPS-0903787]
The purpose of the current study was to investigate the plausibility of delivery of ziconotide to the cerebrospinal fluid (CSF) via intranasal administration. Ziconotide was administered either in the form of solution or Kolliphor P 407 gels (KP 407) intranasally in Sprague-Dawley rats. The effect of incorporation of chitosan in the formulation was also investigated. Time course of drug in the CSF was investigated by collecting CSF from cisterna magna. Pharmacokinetics of ziconotide in CSF following intrathecal and intravenous (i.v.) administration of ziconotide was investigated. Upon intrathecal administration the elimination rate constant of ziconotide in CSF was found to be 1.01 +/- 0.34 h(-1). The C-max and T-max of ziconotide in CSF following intravenous administration were found to be 37.78 +/- 6.8 ng/mL and similar to 2 h respectively. The time required to attain maximum concentration (T-max) in CSF was less upon intranasal administration (15 min) compared to i.v. administration (120 min). Presence of chitosan enhanced the overall bioavailability of ziconotide from intranasal solution and gel formulations. The elimination rate constant of ziconotide in CSF following intranasal and intravenous administration of ziconotide solution was found to be 0.54 +/- 0.08 h(-1) and 0.42 +/- 0.10 h(-1) respectively. Whereas, intranasal administration of ziconotide in the form of in situ forming gel lowered the elimination rate significantly. These results suggest that intranasal administration could be a potential noninvasive and patient compliant method of delivering ziconotide to CSF to treat chronic pain. (C) 2015 Elsevier B.V. All rights reserved.
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