Abstract：
:The suitability of various neurokinin-2 (NK2) receptor agonists and routes of administration to elicit on-demand voiding of the bladder and bowel, as future therapy for individuals with spinal cord injury, was examined using a rat model. The current study examined the feasibility of alternative routes of administration, which are more practical for clinical use than intravenous (IV) administration. Voiding and isovolumetric cystometry were recorded in anesthetized, acutely spinalized, female rats after IV, subcutaneous (SC), intramuscular (IM), intranasal (IN), or sublingual (SL) administration of [Lys5,MeLeu9,Nle10]-NKA(4-10) (LMN-NKA). Administration of LMN-NKA (1-10μg/kg IV; 10-300μg/kg SC or IM; 15-1000μg/kg IN or 300-1500μg/kg SL) elicited rapid-onset, short-duration, dose-related increases in bladder pressure and voiding with the rank order for time of both onset and duration being IV < IN < SC = IM < SL. The incidence of voiding was dependent on the dose and route, with all routes resulting in a high voiding efficiency (~ 70%). Like LMN-NKA, neurokinin A (NKA 1-100μg/kg IV) and GR 64349 (0.1-30μg/kg IV or 1-300μg/kg SC) produced rapid-onset, short-duration increases in bladder pressure, as well as colorectal pressure. Administration of vehicle never produced bladder or rectal contractions or voiding. Transient hypotension was observed after IV injection of LMN-NKA, which was less pronounced after SC injection. Hypotension was not apparent with GR 64349. In conclusion, selective NK2 receptor agonists, administered through various non-IV routes of administration, may provide a safe, convenient, and efficacious method for inducing voiding.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Marson L,Thor KB,Katofiasc M,Burgard EC,Rupniak NMJdoi
10.1016/j.ejphar.2017.12.017subject
Has Abstractpub_date
2018-01-15 00:00:00pages
261-269eissn
0014-2999issn
1879-0712pii
S0014-2999(17)30801-4journal_volume
819pub_type
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