Evidence for eosinophil recruitment, leukotriene B-4 production and mast cell hyperplasia following Toxocara canis infection in rats

Autor(es)

Carlos, D. ^[1] ; Machado, E. R. ^[1] ; De Paula, L. ^[1] ; Sa-Nunes, A. ^[2] ; Sorgi, C. A. ^[1] ; Jamur, M. C. ^[3] ; Oliver, C. ^[3] ; Lima, W. T. ^[4] ; Faccioli, L. H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, FCFRP, Dept Anal Clin Toxicol & Bromatol, BR-14040903 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Inst Ciencias Biomed, Dept Imunol, BR-05508 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Biol Mol & Celular, BR-14040903 Ribeirao Preto, SP - Brazil

^[4] Univ Sao Paulo, Inst Ciencias Biomed, Dept Farmacol, BR-05508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Medical and Biological Research; v. 44, n. 4, p. 319-326, APR 2011.
• Citações Web of Science: 5

Resumo

It is well known that eosinophilia is a key pathogenetic component of toxocariasis. The objective of the present study was to determine if there is an association between peritoneal and blood eosinophil influx, mast cell hyperplasia and leukotriene B(4) (LTB(4)) production after Toxocara canis infection. Oral inoculation of 56-day-old Wistar rats (N = 5-7 per group) with 1000 embryonated eggs containing third-stage (L3) T. canis larvae led to a robust accumulation of total leukocytes in blood beginning on day 3 and peaking on day 18, mainly characterized by eosinophils and accompanied by higher serum LTB(4) levels. At that time, we also noted increased eosinophil numbers in the peritoneal cavity. In addition, we observed increased peritoneal mast cell number in the peritoneal cavity, which correlated with the time course of eosinophilia during toxocariasis. We also demonstrated that mast cell hyperplasia in the intestines and lungs began soon after the T. canis larvae migrated to these compartments, reaching maximal levels on day 24, which correlated with the complete elimination of the parasite. Therefore, mast cells appear to be involved in peritoneal and blood eosinophil infiltration through an LTB(4)-dependent mechanism following T. canis infection in rats. Our data also demonstrate a tight association between larval migratory stages and intestinal and pulmonary mast cell hyperplasia in the toxocariasis model. (AU)

• Processo FAPESP: 01/12145-6 - Estudo sobre a participacao dos mastocitos na hipersensibilidade a hitamina na toxocariase.
• Beneficiário: Daniela Carlos Sartori
• Modalidade de apoio: Bolsas no Brasil - Mestrado