Morphological study of anomalous "laminated" brood capsules in cystic echinococcosis in humans and sheep.
Acta Trop
; 105(3): 215-21, 2008 Mar.
Article
em En
| MEDLINE
| ID: mdl-18243150
ABSTRACT
"Anomalous", as yet unreported forms of brood capsules (BC) in cystic echinococcosis larvae from humans and sheep are described, thought to be the likely effect of degenerative involution of the parasite. Morphological examination showed an inner laminated layer (LL) in the brood capsules in intimate contact with the internal wall surface, suggesting the term "laminated brood capsules" (LBC). Analysis conducted on LBC from cysts of different typology invariably revealed them to contain just dead and highly degenerated protoscoleces (PSC). Structural and ultrastructural aspects of these peculiar forms are described and possible processes of formation discussed. Comparison of germinal layer (GL), BC wall and PSC organization recognize a "tegumental" and a "non-tegumental" pole, coinciding in GL and PSC and inverted in BC. A quite reversible PSC-or-LL switch governed by complex mechanisms is proposed, of which PSC viability/death is assumed to be an essential part, that under certain conditions makes in vivo LL production inwards possible in BC.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
3_ND
Base de dados:
MEDLINE
Assunto principal:
Doenças dos Ovinos
/
Equinococose
/
Echinococcus
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Acta Trop
Ano de publicação:
2008
Tipo de documento:
Article