title: A preliminary study to evaluate an in vitro assay for determining patient whole blood immunosuppressive cyclosporine A and metabolite activity: comparison with cytosolic binding assays using cyclophilin or a 50-kilodalton binding protein, and the Abbott TDx cyclosporine A parent, and parent and metabolites assays.
abstract: Thirty-five allograft recipients undergoing cyclosporine A (CsA) therapy were randomly selected to evaluate a "novel" in vitro assay that determines CsA and metabolite immunosuppressive activity in whole blood. The assay uses a third party mixed lymphocyte culture (MLC) system to which patient whole blood extracts containing CsA and metabolites are added. The ability of the extracted CsA and metabolites to inhibit proliferation in this system is proportional to the immune suppressive activity in whole blood. Comparison of the MLC suppression assay against Abbott TDx parent, TDx parent and metabolites, and radioreceptor assays utilizing cyclophilin or a 50-kDa binding protein isolated from JURKAT cytosol gave the following correlation coefficients: r = 0.612, r = 0.672, r = 0.362, and r = 0.775, respectively.
authors.affiliation: Department of Pharmacology, George Washington University, Washington, D.C.
authors.forename: R L
authors.initials: RL
authors.lastname: Russell
authors.forename: J G
authors.initials: JG
authors.lastname: Donnelly
authors.forename: E W
authors.initials: EW
authors.lastname: Palaszynski
authors.forename: M M
authors.initials: MM
authors.lastname: Chan
authors.forename: S J
authors.initials: SJ
authors.lastname: Soldin
mesh_terms: D000591:Amino Acid Isomerases / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism*; D002460:Cell Line; D003524:Cyclosporins / Q000097:blood* / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D007166:Immunosuppressive Agents / Q000097:blood* / Q000378:metabolism; D007959:Lymphocyte Culture Test, Mixed; D019696:Peptidylprolyl Isomerase; D011869:Radioligand Assay
chemical_list: D002352:Carrier Proteins; D003524:Cyclosporins; D007166:Immunosuppressive Agents; D000591:Amino Acid Isomerases; D019696:Peptidylprolyl Isomerase