title: Combined treatment with interleukin-12 and mebendazole lessens the severity of experimental eosinophilic meningitis caused by Angiostrongylus cantonensis in ICR mice.
abstract: Angiostrongylus cantonensis is the major cause of eosinophilic meningoencephalitis cases in Taiwan. Mice were orally infected with 35 infective larvae. One group of mice were given a single dose of mebendazole (20 mg/kg of body weight) per os at various times and examined at 14 days postinfection (dpi) for worm recovery rate and pathological studies. A 94 to 97% reduction in worm recovery was observed when medication was given at 4 to 5 dpi. Sections of the brains revealed that untreated infected mice developed typical severe eosinophilic meningoencephalitis. Meninges of these mice were thickened by massive infiltration of eosinophils, whereas only moderate pathological change was observed in the brains of mice that were treated with mebendazole at 4 dpi. Infected mice that received daily injections of 10 ng of interleukin-12 (IL-12) only for various numbers of days also exhibited moderate pathological changes in the brain. Eosinophil infiltration in the brains of these mice was low, and severe mechanical injuries in the parenchyma were observed. Treatment with mebendazole in combination with IL-12, however, resulted in low levels of worm recovery and dramatic lessening of the eosinophilic meningitis. A reverse transcriptase PCR assay of mRNA expression in the brain also revealed that the use of IL-12 had shifted the immune response of the mouse from Th2 type to Th1 type. This study could be used in developing strategies for the treatment of human angiostrongylosis.
authors.affiliation: Division of Parasitology, Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei. Pesticide Toxicology Department, Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Taichung, Taiwan.
authors.forename: Wen-Yuan
authors.initials: WY
authors.lastname: Du
authors.forename: Jiunn-Wang
authors.initials: JW
authors.lastname: Liao
authors.forename: Chia-Kwung
authors.initials: CK
authors.lastname: Fan
authors.forename: Kua-Eyre
authors.initials: KE
authors.lastname: Su
mesh_terms: D017185:Angiostrongylus cantonensis; D000818:Animals; D001921:Brain / Q000276:immunology / Q000473:pathology; D016207:Cytokines / Q000096:biosynthesis / Q000235:genetics; D004802:Eosinophilia / Q000188:drug therapy* / Q000276:immunology / Q000473:pathology; D018664:Interleukin-12 / Q000008:administration & dosage*; D008297:Male; D008463:Mebendazole / Q000008:administration & dosage*; D008581:Meningitis / Q000188:drug therapy*; D051379:Mice; D008813:Mice, Inbred ICR; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar; D017206:Strongylida Infections / Q000188:drug therapy* / Q000276:immunology / Q000473:pathology
chemical_list: D016207:Cytokines; D012333:RNA, Messenger; D018664:Interleukin-12; D008463:Mebendazole