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Four groups, containing four monkeys\/sex, received vehicle control or rising doses up to 12, 24, or 48 mg\/kg of SCH351591 daily. Although initial exposure produced clinical signs of emesis, reduced food intake, and reduced body weight, tachyphylaxis to the emesis allowed dose escalation up to 48 mg\/kg\/day. Two monkeys died and 3 were sacrificed in moribund condition over the course of the study. Early mortality, involving monkeys dosed with 12 or 24 mg\/kg, was attributed to sepsis (2 monkeys) or colon inflammation (3 monkeys). Leukocyte function assays on low- and mid-dose group survivors revealed an inhibition of T lymphocyte proliferation for 12 mg\/kg group males and 24 mg\/kg group monkeys of both sexes. Necropsy findings, unassociated with early mortality, included reduced size and weight of the thymus, depletion of body fat, red discoloration of the gastric mucosa, and perivascular hemorrhage of the stomach and heart. Stomach and heart gross findings were present in the high-dose group only. Histopathologic lesions, in addition to those attributed to concurrent bacterial infection, included thymic atrophy, serous atrophy of fat, myocardial degeneration and acute to chronic inflammation of small to medium-sized arteries in various organs and tissues including the heart, kidneys, stomach, salivary glands, pancreas, esophagus, gallbladder, and mesentery. The findings of this study demonstrate the potential of a PDE4 inhibitor to alter immunologic response as well as to produce arteriopathy in nonhuman primates.<\/jats:p>","DOI":"10.1080\/01926230490431493","type":"journal-article","created":{"date-parts":[[2004,5,8]],"date-time":"2004-05-08T01:27:12Z","timestamp":1083979632000},"page":"295-308","source":"Crossref","is-referenced-by-count":67,"title":["The Toxicity of SCH 351591, a Novel Phosphodiesterase-4 Inhibitor, in Cynomolgus Monkeys"],"prefix":"10.1177","volume":"32","author":[{"given":"Patricia E.","family":"Losco","sequence":"first","affiliation":[{"name":"Schering Plough Research Institute, Lafayette, New Jersey 07848, USA,"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ellen W.","family":"Evans","sequence":"additional","affiliation":[{"name":"Schering Plough Research Institute, Lafayette, New Jersey 07848, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephen 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