title: On the roles of urocanic acid in photoimmunosuppression: attempted photorepair of urocanic acid-DNA cyclobutane adducts with DNA photolyase.
abstract: It has been reported that UV-induced immunosuppression can be reversed by photoreactivation or exposure to T4 endonuclease V, two treatments that can repair cyclobutane pyrimidine dimers. These observations, together with the known role of urocanic acid (UA) in UV-induced immune suppression, prompted us to study the ability of DNA photolyase to repair UA-DNA cyclobutane photoadducts in single-stranded calf thymus DNA. We did not detect any release of UA, with a sensitivity implying that photolyase is at least 2900 times less active toward UA-DNA adducts than toward cis-syn thymine-thymine dimers. This indicates that any reversal of photoimmunosuppression by photoreactivation cannot significantly involve cleavage of UA-DNA cyclobutane adducts.
authors.affiliation: Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Terrian
authors.forename: C N
authors.initials: CN
authors.lastname: Kuhl
authors.forename: I
authors.initials: I
authors.lastname: Tessman
authors.forename: H
authors.initials: H
authors.lastname: Morrison
mesh_terms: D000818:Animals; D002417:Cattle; D003503:Cyclobutanes / Q000378:metabolism / Q000528:radiation effects; D018736:DNA Adducts / Q000378:metabolism* / Q000528:radiation effects; D004260:DNA Repair; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000378:metabolism; D066298:In Vitro Techniques; D010777:Photochemistry; D014466:Ultraviolet Rays / Q000009:adverse effects; D014560:Urocanic Acid / Q000378:metabolism* / Q000528:radiation effects
chemical_list: D003503:Cyclobutanes; D018736:DNA Adducts; D004255:Deoxyribodipyrimidine Photo-Lyase; D014560:Urocanic Acid