title: The effect of two new immunosuppressive agents, FK506 and didemnin B, in murine pregnancy.
abstract: The purpose of this study was to investigate two promising immunosuppressive agents, didemnin B (DB) and FK506 (FK), during pregnancy to assess potential adverse maternal or fetal effects. Pregnant C3H mice were randomized into control and high- and low-dose treatment groups for each drug. Animals received daily injections from day 1 to day 16, and on day 17 of gestation the maternal condition, litter size, fetal resorption rates, and fetal/placental unit weights were determined. Immunoglobulin (IgG) levels were obtained for DB treatment groups. Delayed type hypersensitivity was assessed in virgin females. Both DB and FK had dose-dependent immunosuppressive activity in the DTH assay, and DB caused elevated IgG concentrations. High doses of DB caused diarrhea and maternal wasting with no fetal survival; with low-dose DB, maternal weight gain was depressed, but pregnancy outcome was not different from control animals. High-dose FK had no obvious detrimental effects on maternal health but caused resorption of all fetuses; administration of low-dose FK resulted in a higher number of resorptions, but fetuses that survived did not appear different from controls. We conclude that these immunosuppressive drugs can have adverse effects on pregnancy, but the maternal and fetal toxicity are dose-dependent.
authors.affiliation: Department of Obstetrics and Gynecology, University of Utah Medical Center, Salt Lake City 84132.
authors.forename: D E
authors.initials: DE
authors.lastname: Farley
authors.forename: J
authors.initials: J
authors.lastname: Shelby
authors.forename: D
authors.initials: D
authors.lastname: Alexander
authors.forename: J R
authors.initials: JR
authors.lastname: Scott
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D047630:Depsipeptides; D004305:Dose-Response Relationship, Drug; D005260:Female; D005328:Fetal Viability / Q000187:drug effects; D005333:Fetus / Q000187:drug effects*; D006968:Hypersensitivity, Delayed; D007074:Immunoglobulin G / Q000096:biosynthesis; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D008431:Maternal-Fetal Exchange; D051379:Mice; D008809:Mice, Inbred C3H; D009929:Organ Size / Q000187:drug effects; D010456:Peptides, Cyclic / Q000494:pharmacology*; D010920:Placenta / Q000033:anatomy & histology; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000187:drug effects*; D012119:Respiration / Q000187:drug effects; D016559:Tacrolimus; D015430:Weight Gain / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D047630:Depsipeptides; D007074:Immunoglobulin G; D007166:Immunosuppressive Agents; D010456:Peptides, Cyclic; C030051:didemnins; D016559:Tacrolimus