title: MDI 301, a nonirritating retinoid, improves abrasion wound healing in damaged/atrophic skin.
abstract: MDI 301 is a picolinic acid-substituted ester of 9-cis retinoic acid. It has been shown in the past that MDI 301 increases epidermal thickness, decreases matrix metalloproteinase (MMP) activity, and increases procollagen synthesis in organ-cultured human skin. Unlike all-trans retinoic acid (RA), MDI 301 does not induce expression of proinflammatory cytokines or induce expression of leukocyte adhesion molecules in human skin. In the present study we examined topical MDI 301 treatment for ability to improve the structure and function of skin in three models of skin damage in rodents and for ability to improve abrasion wound healing in these models. MDI 301 was applied daily to the skin of rats treated with the potent corticosteroid, clobetasol propionate, to the skin of diabetic rats (8 weeks posttreatment with streptozotocin) and to the skin of aged (14-16-month-old) rats. In all three models, subsequently induced abrasion wounds healed more rapidly in the retinoid-treated animals than in vehicle-treated controls. Immediately after complete wound closure, tissue from the wound site (as well as from a control site) was put into organ culture and maintained for 3 days. At the end of the incubation period, culture fluids were assessed for soluble type I collagen and for MMPs-2 and -9. In all three models, the level of type I collagen was increased and MMP levels were decreased by MDI 301. In all three models, skin irritation during the retinoid-treatment phase was virtually nonexistent.
authors.affiliation: Department of Pathology, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Roscoe L
authors.initials: RL
authors.lastname: Warner
authors.forename: Narasimharao
authors.initials: N
authors.lastname: Bhagavathula
authors.forename: Kamalakar
authors.initials: K
authors.lastname: Nerusu
authors.forename: Andrew
authors.initials: A
authors.lastname: Hanosh
authors.forename: Shannon D
authors.initials: SD
authors.lastname: McClintock
authors.forename: Madhav K
authors.initials: MK
authors.lastname: Naik
authors.forename: Kent J
authors.initials: KJ
authors.lastname: Johnson
authors.forename: Isaac
authors.initials: I
authors.lastname: Ginsburg
authors.forename: James
authors.initials: J
authors.lastname: Varani
mesh_terms: D000818:Animals; D001284:Atrophy; D024042:Collagen Type I / Q000032:analysis; D003879:Dermatologic Agents / Q000494:pharmacology; D004195:Disease Models, Animal; D008297:Male; D020782:Matrix Metalloproteinases / Q000032:analysis; D051379:Mice; D008812:Mice, Hairless; D051381:Rats; D054772:Rats, Hairless; D012176:Retinoids / Q000494:pharmacology*; D012867:Skin / Q000737:chemistry / Q000187:drug effects* / Q000473:pathology; D015595:Skin Aging; D012871:Skin Diseases / Q000139:chemically induced / Q000188:drug therapy / Q000209:etiology / Q000503:physiopathology*; D014945:Wound Healing / Q000187:drug effects*
chemical_list: D024042:Collagen Type I; D003879:Dermatologic Agents; C488463:MDI 301; D012176:Retinoids; D020782:Matrix Metalloproteinases