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Product identification and kinetic data are presented for the conversion of 7,8-dihydrobiopterin into tetrahydrobiopterin by purified rabbit brain dihydrofolate reductase.
Four separate groups of patients have been studied: (1) The effect of high-dose methotrexate (MTX) administration on glomerular filtration rate was determined by pre- and posttreatment inulin and creatinine clearances in nine patients. Measurements were made prior to and 24-40 hr after drug administration. Inulin and creatinine clearances both decreased a… (More)
We enrolled 116 patients in a multicenter, randomized, double-blind controlled trial of an 8-week course of 11 plasma exchange (PE) treatments in exacerbations of MS. The control group received sham PE, and both groups received identical treatment with IM ACTH and oral cyclophosphamide. Serum IgG decreased in the PE and sham treatment groups by 76% versus… (More)
Iron overload from repeated transfusions of RBCs in long-term hemodialysis patients is a problem of increasing clinical significance. We report on the prevalence of and diagnostic criteria for identification of hemodialysis patients with iron overload. In 150 unselected hemodialysis patients, 62 (41%) had ferritin levels greater than 2,000 ng/mL (normal =… (More)
We evaluated the kinetics and efficacy of deferoxamine (DFO) therapy in iron-overloaded hemodialysis patients. Concentrations of DFO and its chelated product, feroxamine (Fx), were assessed following single-dose DFO administration in twelve patients, and during chronic therapy over one year's time in eight, similarly iron-overloaded dialysis patients. A… (More)
Standard apheresis techniques require modification of use in children, particularly those with serious concurrent medical problems, as they are prone to apheresis-induced disturbances of volume, metabolism, and coagulation. We report 112 plasma exchanges (TPE) on 11 children, 9 of whom weighed less than 20 kg and 7 of whom were critically ill. All were… (More)
Ten primary and two metastatic central-nervous system (C.N.S.) tumours were assayed. They all contained dihydrofolate reductase. This finding provides a biochemical rationale for antifolate therapy of C.N.S. tumours by methotrexate.
Multiple sclerosis may ultimately be effectively treated using appropriate immunosuppressive regimens. Both cytotoxic drugs and therapeutic apheresis may constitute important therapeutic options. A number of studies are currently underway which will hopefully clarify the exact role of these treatment modalities in patients at different stages of disease.