title: Structure-activity studies of a series of dipyrazolo[3,4-b:3',4'-d]pyridin-3-ones binding to the immune regulatory protein B7.1.
abstract: The interaction of co-stimulatory molecules on T cells with B7 molecules on antigen presenting cells plays an important role in the activation of naive T cells. Consequently, agents that disrupt these interactions should have applications in treatment of transplant rejection as well as autoimmune diseases. To this end, specific small molecule inhibitors of human B7.1 were identified and characterized. Herein, we report the identification of potent small molecule inhibitors of the B7.1-CD28 interaction. In a high-throughput screen we identified several leads that prevented the interaction of B7.1 with CD28 with activities in the nanomolar to low micromolar range. One of these, the dihydrodipyrazolopyridinone 1, was subsequently shown to bind the V-like domain of human B7.1 at equimolar stoichiometry. With this as a starting point, we report here the synthesis and initial in vitro structure-activity relationships of a series of these compounds.
authors.affiliation: Department of Chemical Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, MA 02140, USA. ngreen@wyeth.com
authors.forename: Neal J
authors.initials: NJ
authors.lastname: Green
authors.forename: Jason
authors.initials: J
authors.lastname: Xiang
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Lihren
authors.initials: L
authors.lastname: Chen
authors.forename: Audrey M
authors.initials: AM
authors.lastname: Davies
authors.forename: Dave
authors.initials: D
authors.lastname: Erbe
authors.forename: Steve
authors.initials: S
authors.lastname: Tam
authors.forename: James F
authors.initials: JF
authors.lastname: Tobin
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000737:chemistry / Q000378:metabolism; D018122:B7-1 Antigen / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D018106:CD28 Antigens / Q000032:analysis / Q000378:metabolism; D045744:Cell Line, Tumor; D018920:Coculture Techniques; D006801:Humans; D020128:Inhibitory Concentration 50; D019869:Phosphatidylinositol 3-Kinases / Q000032:analysis / Q000378:metabolism; D011485:Protein Binding / Q000187:drug effects; D011728:Pyridones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D018122:B7-1 Antigen; D018106:CD28 Antigens; D011728:Pyridones; D019869:Phosphatidylinositol 3-Kinases