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Defense reactions of Dermatobia hominis (Diptera: Cuterebridae) larval hemocytes
Faraldo, A. C; Lello, E.
  • Faraldo, A. C; Universidade Estadual Paulista. Instituto de Biociências. Departamento de Morfologia. Botucatu. BR
  • Lello, E; s.af
Biocell ; 27(2): 197-203, Aug. 2003.
Artigo em Inglês | LILACS | ID: lil-384243
RESUMO
The defense reactions against biological (Histoplasma capsulatum and Escherichia coli) and non-biological materials (China ink and nylon thread) were tested in vivo in third instar larvae of Dermatobia hominis. The cellular defense performed by larval hemocytes was observed under electron microscopy. China ink particles were phagocytosed by granular cells 5 h after injection. E. coli cells were internalized by granular cells as early as 5 min after injection and totally cleared 180 min post-injection, when many hemocytes appeared disintegrated and others in process of recovering. H. capsulatum yeasts provoked, 24 h after being injected, the beginning of nodule formation. Nylon thread was encapsulated 24 h after the introduction into the hemocoel. Our results suggest that granular cells were the phagocytic cells and also the responsible for the triggering of nodule and capsule formation. In the presence of yeasts cells and nylon thread, they released their granules that chemotactically attracted the plasmatocytes that on their turn, flattened to surround and isolate the foreign material.
Assuntos
Texto completo: DisponíveL Índice: LILACS (Américas) Assunto principal: Fagócitos / Dípteros / Hemócitos / Imunidade Celular / Larva Idioma: Inglês Revista: Biocell Assunto da revista: C‚lulas Ano de publicação: 2003 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Universidade Estadual Paulista/BR

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Texto completo: DisponíveL Índice: LILACS (Américas) Assunto principal: Fagócitos / Dípteros / Hemócitos / Imunidade Celular / Larva Idioma: Inglês Revista: Biocell Assunto da revista: C‚lulas Ano de publicação: 2003 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Universidade Estadual Paulista/BR