Abstract：
:A deamination product of histidine, urocanic acid, accumulates in the skin of mammals as trans-urocanic acid. Ultraviolet (UV) irradition converts it to the cis-isomer that is an important mediator in UV-induced immunosuppression. We have recently shown that urocanic acid interferes with the agonist binding to GABA(A) receptors. We now report that the effects of urocanic acid on binding of a convulsant ligand (t-butylbicyclo[35S]phosphorothionate) to GABA(A) receptors in brain membrane homogenates are dependent on pH of the incubation medium, the agonistic actions being enhanced at the normal pH of the skin (5.5). Using Xenopus laevis oocytes expressing recombinant rat alpha1beta1gamma2S GABA(A) receptors, the low pH potentiated the direct agonistic action of trans-urocanic acid under two-electrode voltage-clamp, whereas cis-urocanic acid retained its low efficacy both at pH 5.5 and 7.4. The results thus indicate clear differences between urocanic acid isomers in functional activity at one putative receptor site of immunosuppression, the GABA(A) receptor, the presence of which in the skin remains to be demonstrated.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Uusi-Oukari M,Soini SL,Heikkilä J,Koivisto A,Neuvonen K,Pasanen P,Sinkkonen ST,Laihia JK,Jansén CT,Korpi ERdoi
10.1016/s0014-2999(00)00395-2keywords:
subject
Has Abstractpub_date
2000-07-14 00:00:00pages
11-7issue
1eissn
0014-2999issn
1879-0712pii
S0014-2999(00)00395-2journal_volume
400pub_type
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