title: Preparation and biological evaluation of a potential photoaffinity label for the prostaglandin H2/thromboxane A2 receptor.
abstract: Two aromatic azides (24 and 26) were prepared as potential photoaffinity probes for the PGH2/TXA2 receptor. The compounds are based on the well-characterized PGH2/TXA2 receptor antagonist 13-azaprostanoic acid, with the terminus of its lower side chain replaced with phenoxy (24) or benzyl (26) azide functionality. The two compounds were shown to irreversibly inhibit platelet function after photolysis and resuspension. However, of the two aromatic azides, only the benzyl derivative 26 appeared to be selective for the prostaglandin pathway. The latter compound was also prepared as the aromatic 125I (29) derivative, which may ultimately prove useful as a labeled probe for the identification and isolation of the putative TXA2/PGH2 receptor.
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000345:Affinity Labels / Q000138:chemical synthesis / Q000494:pharmacology*; D001386:Azides / Q000138:chemical synthesis / Q000494:pharmacology*; D055598:Chemical Phenomena; D002621:Chemistry; D005227:Fatty Acids / Q000494:pharmacology*; D006801:Humans; D010782:Photolysis; D010974:Platelet Aggregation / Q000187:drug effects; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D011466:Prostanoic Acids / Q000494:pharmacology*; D011982:Receptors, Prostaglandin / Q000187:drug effects*; D017482:Receptors, Thromboxane; D044244:Receptors, Thromboxane A2, Prostaglandin H2
chemical_list: D000345:Affinity Labels; D001386:Azides; D005227:Fatty Acids; D011450:Prostaglandin Endoperoxides, Synthetic; D011466:Prostanoic Acids; D011982:Receptors, Prostaglandin; D017482:Receptors, Thromboxane; D044244:Receptors, Thromboxane A2, Prostaglandin H2; D000244:Adenosine Diphosphate; C022574:13-azaprostanoic acid