title: The synthesis and immunosuppressive activities of steroid-urotoxin linkers.
abstract: The urotoxins (Glu-Asp-Gly-OH, His-Gly-Glu-OH, His-Gly-Lys-OH, and His-Gly-Lys-NHNH(2)) were introduced into the convenient sites of hydrocortisone and prednisolone via the amidation or condensation reactions to form the corresponding linkers 7a-d, 8a-d, 9a,b, and 10a,b in acceptable yields. The bioassays such as prolongation of heterotopic transplanted cardiac tissue survival in vivo, inhibitory effects on phagocytosis of mouse peritoneal macrophages and concanavalin (ConA) or lipopolysaccharide (LPS) induced proliferation of mouse spleen lymphocytes in vitro show that at the comparable concentrations the immunosuppressive activities of the steroid-urotoxin linkers 7a-d, 8a-d, 9a,b, and 10a,b were higher than that of hydrocortisone, prednisolone, and the urotoxins alone, as well as significantly higher than that of the mixture of hydrocortisone and urotoxins or prednisolone and urotoxins. The so-called 'permissive action' may be responsible for the enhancement of the mentioned bioactivities of the steroid-urotoxin linkers 7a-d, 8a-d, 9a,b, and 10a,b.
authors.affiliation: College of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Xuecai
authors.initials: X
authors.lastname: Qiu
authors.forename: Shiqi
authors.initials: S
authors.lastname: Peng
mesh_terms: D000818:Animals; D006854:Hydrocortisone / Q000737:chemistry*; D007166:Immunosuppressive Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects; D017737:Macrophages, Peritoneal / Q000187:drug effects; D051379:Mice; D009842:Oligopeptides / Q000737:chemistry*; D010587:Phagocytosis / Q000187:drug effects; D011239:Prednisolone / Q000737:chemistry*
chemical_list: D007166:Immunosuppressive Agents; D009842:Oligopeptides; D011239:Prednisolone; D006854:Hydrocortisone