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• W2047028992 abstract "The objective was to demonstrate that the immunosuppressive agent HR325 (an inhibitor of dihydroorotate dehydrogenase, DHODH) inhibits immunoglobulin (Ig) secretion both in vitro and in vivo and that this effect can be reversed with exogenous uridine. In vitro , Ig secretion from mouse splenocytes was induced by lipopolysaccharide (LPS) for 5 days. HR325 inhibited the secretion of IgM and IgG with IC 50 values of 2.5 and 2 µ m , respectively. Adding uridine (50 µ m ) increased these values to 70 and 60 µ m , respectively. Similarly, the IC 50 values of another DHODH inhibitor, brequinar sodium, were also attenuated by uridine from 0.04 to 1 µ m for IgM, and 0.012 to 10 µ m for IgG. HR325 (and a structural analogue A771726) inhibited LPS-induced kappa light-chain cell surface expression on 70Z/3 cells, a property also reversed by uridine. In vivo , the secondary anti-sheep red blood cell (SRBC) antibody response (unaffected by uridine alone) was inhibited by HR325 and brequinar with respective ID 50 values of 38 and 0.6 mg/kg per oral (p.o.). Immunosuppression with HR325 (50 mg/kg) and brequinar (1 mg/kg) was abrogated by uridine. Uridine had no effect on cyclophosphamide-induced (10 mg/kg p.o.) immunosuppression. These data are consistent with the immunosuppressive mechanism of HR325 being the result of pyrimidine depletion in vitro and in vivo ." @default.
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• W2047028992 date "2002-06-28" @default.
• W2047028992 modified "2023-09-27" @default.
• W2047028992 title "In Vitro and In Vivo Inhibition of Immunoglobulin Secretion by the Immunosuppressive Compound HR325 is Reversed by Exogenous Uridine" @default.
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• W2047028992 doi "https://doi.org/10.1046/j.1365-3083.2002.01107.x" @default.
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