Pre-Clinical Development of Topical Pirenzepine for Treating Diabetic Neuropathy

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 DESCRIPTION (provided by applicant): The objective of this SBIR fast-track project is to expediently advance pre-clinical development of a new therapeutic for diabetic neuropathy. Of the 25 million Americans who suffer from diabetes, approximately 50% will be diagnosed with neuropathy, which is characterized by nerve degeneration. Despite the high prevalence of the disease, there is currently no FDA-approved treatment to either prevent diabetes-induced nerve degeneration or promote nerve regeneration. Thus, there is a substantial unmet need to develop more effective treatments for diabetic neuropathy. The founders of WinSanTor have identified a promising candidate which both prevents and reverses neuropathy in rodent models of the disease. The candidate molecule, pirenzepine, was identified using a novel screening methodology developed in the labs of the company's founders. Pirenzepine has subsequently been evaluated in over a dozen in vivo tests, and has demonstrated the unique ability to ameliorate both epidermal fiber loss and thermal hypoalgesia. Pirenzepine is an approved drug for other indications in non-US countries, and so it is substantially de-risked as a drug development candidate. Based on the molecule's significant potential as a first-in-class molecule for treating diabetic neuropathy, we propose a fast-track project to rapidly advance pre-clinical development of the molecule. Phase I Specific Aims are: 1) Assess in vitro release and retention, single dose pharmacokinetics, and tissue distribution of topically administered pirenzepine. 2) Determine acute toxicity under non-GLP conditions. 3) Evaluate genotoxicity and hERG under non-GLP conditions. 4) Conduct dermal toxicity studies under non-GLP conditions. The metrics of success to advance to Phase II are: 1) Identification of at least one formulation in which sufficient quantities of active ingredient are present in the tissues and plasma following topical administration (porcine model), and 2) No significant toxicity liabilities Phase II Specific Aims are: 1) Develop analytical techniques and obtain GMP material. 2) Conduct acute toxicity and 3-month toxicity studies with two animal species under GLP conditions. 3) Conduct safety toxicology and genotoxicity studies under GLP conditions. 4) Conduct dermal toxicity studies under GLP conditions. The metric of success of Phase II is to develop a complete safety package that will be submitted to the FDA as part of an IND filing.