Chlamydiae and polymorphonuclear leukocytes: unlikely allies in the spread of chlamydial infection.
FEMS Immunol Med Microbiol
; 54(1): 104-13, 2008 Oct.
Article
en En
| MEDLINE
| ID: mdl-18657107
ABSTRACT
While much is known about the attachment of the chlamydiae to the host cell and intracellular events during the developmental cycle, little is known about the mechanism(s) by which elementary bodies exit the cell. In this report, we use the guinea-pig conjunctival model of Chlamydia caviae infection to present in vivo ultrastructural evidence supporting two mechanisms for release of chlamydiae from the mucosal epithelia. Four days after infection, histopathologic observation shows an intense infiltration of polymorphonuclear leukocytes (PMN) in the conjunctival epithelium. Using transmission electron microscopy, a gradient-directed PMN response to chlamydiae-infected epithelial cells was observed. As PMN infiltration intensifies, epithelial hemidesmosome/integrin/focal adhesion adherence with the basal lamina is disconnected and PMNs literally lift off and release infected superficial epithelia from the mucosa. Many of these infected cells appear to be healthy with intact microvilli, nuclei, and mitochondria. While lysis of some infected cells occurs with release of chlamydiae into the extracellular surface milieu, the majority of infected cells are pushed off the epithelium. We propose that PMNs play an active role in detaching infected cells from the epithelium and that these infected cells eventually die releasing organisms but, in the process, move to new tissue sites via fluid dynamics.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Chlamydia
/
Conjuntivitis de Inclusión
/
Conjuntiva
/
Células Epiteliales
/
Neutrófilos
Límite:
Animals
/
Female
/
Humans
Idioma:
En
Revista:
FEMS Immunol Med Microbiol
Asunto de la revista:
ALERGIA E IMUNOLOGIA
/
DOENCAS TRANSMISSIVEIS
/
MICROBIOLOGIA
Año:
2008
Tipo del documento:
Article
País de afiliación:
Estados Unidos