title: Evaluation of retinoid lactones as topical therapeutic agents in dermatology.
abstract: OBJECTIVE
  Optimization of the therapeutic ratio of analogs of the topically active 11-cis, 13-cis-12-hydroxymethylretinoic acid, delta-lactone (1) relative to antihyperproliferation and antihyperkeratinization vs. toxicity.
  
  
  METHODS
  Nine analogs of 1, in which variations were made in the lipophilic cyclohexenyl moiety or in the lactone ring, were evaluated for topical activity against hyperkeratinization, inhibition of TPA-induced DNA synthesis and for skin irritation.
  
  
  RESULTS
  Although more potent lactones than the parent lactone 1 were identified, none possessed the favorable therapeutic ratio associated with 1.
  
  
  CONCLUSIONS
  The delta-lactone 1 possesses unique molecular features responsible for its desirable therapeutic ratio as an antihyperproliferative and antihyperkeratotic agent. In view of its very low systemic retinoid toxicity and the absence of any systemic toxicity, this lactone may be a good candidate for use in the topical treatment of acne.
mesh_terms: D000287:Administration, Topical; D000818:Animals; D004353:Drug Evaluation, Preclinical; D007633:Keratins / Q000378:metabolism; D007783:Lactones / Q000138:chemical synthesis / Q000494:pharmacology* / Q000633:toxicity; D051379:Mice; D012176:Retinoids / Q000138:chemical synthesis / Q000494:pharmacology* / Q000633:toxicity; D012867:Skin / Q000187:drug effects / Q000378:metabolism; D012871:Skin Diseases / Q000188:drug therapy* / Q000378:metabolism; D014212:Tretinoin / Q000494:pharmacology
chemical_list: D007783:Lactones; D012176:Retinoids; D014212:Tretinoin; D007633:Keratins