Dried blood spot analysis of donepezil in support of a GLP 3-month dose-range finding study in rats.

Donepezil hydrochloride is a reversible acetyl cholinesterase inhibitor approved for Alzheimer disease treatment. As an alternate therapy, a donepezil hydrochloride transdermal patch is in development. Recommended nonclinical safety studies include a 3-month Good Laboratory Practice (GLP) dose-range finding (DRF) study prior to conducting the 2-year dermal carcinogenicity study in rats.

Comparison of oral and transdermal administration of rasagiline mesylate on human melanoma tumor growth in vivo.

Background/aims: Transdermal patch administration results in a locally high concentration of drug that induce local toxicity, including tumorogenicity. As a worst-case scenario for consequences of repeated application on neoplastic growth, the melanin-binding drug, rasagiline, was used in a transdermal formulation applied directly to a human-derived melanoma to determine the effects on tumor growth.

Materials And Methods: Rasagiline mesylate was administered either orally or transdermally to athymic mice implanted with human melanoma (SKMEL28) to determine the effects on tumor growth and survival.

Irritant contact dermatitis: effect of age.

Knowledge on age-relationship to irritant contact dermatitis (ICD) remains of interest. We searched for articles and textbooks on age-relationship to ICD and evaluated relevant data. Irritant response may be enhanced in children and decline with increasing age.

Allergic contact dermatitis: effect of age.

The relationship between allergic contact dermatitis (ACD) and age has not been well documented. We searched for articles and textbooks based on age-ACD relationship and evaluated relevant data. The frequency of skin reactions to allergens increased with age in some studies, whereas others showed no definite effect.

Immunomodulatory roles of topical dinitrochlorobenzene treatment in Herpes simplex virus infection.

Epicutaneous application of a contact sensitizer 2, 4-dinitro-1-chlorobenzene (DNCB) is known to cause an inflammatory response and a hapten-specific T cell activation. We developed a highly stable gel formulation for DNCB which is easy to apply to the skin. The present study focused on whether topical application of DNCB gel produced immunomodulation with prophylactic effects against lethal herpes simplex virus infection (HSV) type 1.