title: Delivery of salmon calcitonin using a microneedle patch.
abstract: Peptides and polypeptides have important pharmacological properties but only a limited number have been exploited as therapeutics because of problems related to their delivery. Most of these drugs require a parenteral delivery system which introduces the problems of pain, possible infection, and expertise required to carry out an injection. The aim of this study was to develop a transdermal patch containing microneedles (MNs) coated with a peptide drug, salmon calcitonin (sCT), as an alternative to traditional subcutaneous and nasal delivery routes. Quantitative analysis of sCT after coating and drying onto microneedles was performed with a validated HPLC method. In vivo studies were carried out on hairless rats and serum levels of sCT were determined by ELISA. The AUC value of MNs coated with a trehalose-containing formulation (250 ± 83 ng/mL min) was not significantly different as compared to subcutaneous injections (403 ± 253 ng/mL min), but approximately 13 times higher than nasal administration (18.4 ± 14.5 ng/mL min). T(max) (7.5 ± 5 min) values for MN mediated administration were 50% shorter than subcutaneous injections (15 min), possibly due to rapid sCT dissolution and absorption by dermal capillaries. These results suggest that with further optimization of coating formulations, microneedles may enable administration of sCT and other peptides without the need for hypodermic injections.
authors.affiliation: School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100, USA.
authors.forename: Cetin
authors.initials: C
authors.lastname: Tas
authors.forename: Saffar
authors.initials: S
authors.lastname: Mansoor
authors.forename: Haripriya
authors.initials: H
authors.lastname: Kalluri
authors.forename: Vladimir G
authors.initials: VG
authors.lastname: Zarnitsyn
authors.forename: Seong-O
authors.initials: SO
authors.lastname: Choi
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Banga
authors.forename: Mark R
authors.initials: MR
authors.lastname: Prausnitz
mesh_terms: D000281:Administration, Intranasal; D000818:Animals; D001682:Biological Availability; D002116:Calcitonin / Q000008:administration & dosage* / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; D004797:Enzyme-Linked Immunosorbent Assay; D004867:Equipment Design; D007271:Injections, Intradermal; D007275:Injections, Intravenous; D007279:Injections, Subcutaneous; D008297:Male; D008845:Microinjections; D008904:Miniaturization; D009339:Needles; D051381:Rats; D054772:Rats, Hairless; D017207:Rats, Sprague-Dawley; D012995:Solubility; D013678:Technology, Pharmaceutical / Q000379:methods; D057968:Transdermal Patch
chemical_list: D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; C028815:salmon calcitonin; D002116:Calcitonin