Abstract
Purpose
A low temperature hollow microneedle system was devised to deliver sol-gel transition formulation near the surface of the skin for extended release and local delivery of drug by a non-invasive method. This new system can improve treatment of intermittent fecal incontinence.
Method
The low-temperature system was integrated with a hollow microneedle to maintain the low temperature of the sol formulation. Various sol-gel formulations using Pluronic F-127 (PF-127) and Hydroxy-propyl-methyl-cellulose (HPMC) were prepared, and their gelation temperature, flow property, and diffusion retardation were observed. Resting anal sphincter pressure in response to a phenylephrine (PE) sol-gel formulation was measured using an air-charged catheter. The biocompatibility of the sol-gel PE formulation was evaluated by observing the immunological response.
Results
When the PF-127 25%, HPMC 1% and PE formulation (PF25-HPMC1-PE) was injected through the peri-anal skin of the rat in vivo, the highest pressure on the anal sphincter muscle occurred at 6–8 h and anal pressure increased and lasted twice as long as with the phosphate-buffered saline (PBS)-PE formulation. There was no significant difference in the number of mast cells after administration into the rat in vivo between the PF25-HPMC1-PE formulation and the PBS-PE formulation.
Conclusion
The combination of a low-pain hollow microneedle system and an injectable sol-gel formulation improved the efficacy of treatment of intermittent fecal incontinence. A low-temperature hollow microneedle system using a sol-gel formulation has many applications in medical treatments that require depot effect, local targeting, and pain control.
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Abbreviations
- HPMC :
-
Hydroxy-propyl-methyl-cellulose
- PBS :
-
Phosphate-buffered saline
- PBS-PE :
-
Phosphate-buffered saline and PE formulation
- PE :
-
Phenylephrine
- PF-127 :
-
Pluronic F-127
- PF-15 :
-
Pluronic 15% (w/w))
- PF-25 :
-
Pluronic 25% (w/w)),
- PF-15/HPMC-1 :
-
Pluronic 15% (w/w) and hydroxyl propyl methyl cellulose (HPMC) 1% (w/w)
- PF-25/HPMC-1 :
-
Pluronic 25% (w/w) and hydroxyl propyl methyl cellulose (HPMC) 1% (w/w)
- PF-25/HPMC-3 :
-
Pluronic 25% (w/w) and hydroxyl propyl methyl cellulose (HPMC) 3% (w/w)
- PF25-HPMC1-PE :
-
Pluronic 25% (w/w) and hydroxyl propyl methyl cellulose (HPMC) 1% (w/w) and PE formulation
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Acknowledgments and Disclosures
This research was supported by a grant of Basic Science Research Program (2014R1A1A2A16051484) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education and by Industrial Strategic Technology Development Program (10,067,809, Development of vaccine formulation and patient-convenient vaccine microneedle) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
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Lee, H., Park, JH. & Park, J.H. Administration of a Sol-Gel Formulation of Phenylephrine Using Low-Temperature Hollow Microneedle for Treatment of Intermittent Fecal Incontinence. Pharm Res 34, 2809–2816 (2017). https://doi.org/10.1007/s11095-017-2261-9
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DOI: https://doi.org/10.1007/s11095-017-2261-9