A New Year, New Publications!

Michael W. Pennington, along with some of his frequent collaborators/coauthors, has a newly published, interesting paper.  Congratulations!

J Control Release. 2015 Feb 10;199:37-44. doi: 10.1016/j.jconrel.2014.12.001. Epub 2014 Dec 4.
Buccal mucosal delivery of a potent peptide leads to therapeutically-relevant plasma concentrations for the treatment of autoimmune diseases.L. Jin , B.J. Boyd, P.J. White, M.W. Pennington, R.S. Norton, J.A. Nicolazzo.

Abstract
Stichodactyla helianthus neurotoxin (ShK) is an immunomodulatory peptide currently under development for the treatment of autoimmune diseases, including multiple sclerosis and rheumatoid arthritis by parenteral administration. To overcome the low patient compliance of conventional self-injections, we have investigated the potential of the buccal mucosa as an alternative delivery route for ShK both in vitro and in vivo. After application of fluorescent 5-Fam-ShK to untreated porcine buccal mucosa, there was no detectable peptide in the receptor chamber using an in vitro Ussing chamber model. However, the addition of the surfactants sodium taurodeoxycholate hydrate or cetrimide, and formulation of ShK in a chitosan mucoadhesive gel, led to 0.05-0.13% and 1.1% of the applied dose, respectively, appearing in the receptor chamber over 5h. Moreover, confocal microscopic studies demonstrated significantly enhanced buccal mucosal retention of the peptide (measured by mucosal fluorescence associated with 5-Fam-ShK) when enhancement strategies were employed. Administration of 5-Fam-ShK to mice (10mg/kg in a mucoadhesive chitosan-based gel (3%, w/v) with or without cetrimide (5%, w/w)) resulted in average plasma concentrations of 2.6-16.2nM between 2 and 6h, which were substantially higher than the pM concentrations required for therapeutic activity. This study demonstrated that the buccal mucosa is a promising administration route for the systemic delivery of ShK for the treatment of autoimmune diseases.

Custom Peptide Synthesis , Industry News , Biologically Active Peptides , Peptides International News

Robert Brousseau

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Robert Brousseau, the Director of Marketing and Catalog Sales Development at Peptides International, has a wide range of responsibilities that include maintaining the Peptides International brand integrity and creating and implementing all materials related to marketing the company's product line. He is also tasked with the catalog portfolio sales.  Since joining the company in 2004, he has incorporated media that now includes printed material such as product brochures and the long-running PEPNET newsletter, along with the company Website, social media, email and other outlets.  Additionally, he assists the staff with IT issues they encounter.  Bob has a background in graphic design, marketing, and advertising, in addition to project management and packaging.  He received his B.A. in Art from the University of Louisville, with additional post-graduate studies in education and design.