Aeromonas hydrophila exotoxin induces cytoplasmic vacuolation and cell death in VERO cells.
Many organisms are able to cause cell vacuolation, but it is unclear if this can be considered a step of apoptosis or necrosis, or a distinct form of cell death. In this study VERO cells were used to evaluate the relationship between vacuolation and cell death pattern caused by exotoxins produced by environmental strains of A. hydrophila. Cell damage has been evaluated morphologically as well as biochemically. Cytotoxic and vacuolating titres were strictly correlated and the vacuolation has to be considered an early indicator of cytotoxicity that causes cell apoptosis or necrosis in relation to the dose. Signs of apoptosis (chromatin condensation and blebbing) were observed at low concentration and TGase activity, referable to apoptosis induction, confirms morphological observations. In fact, putrescine incorporation was related both to cytotoxin concentration and time of incubation. Moreover, the observed doubling cells with necrotic features permit us to suppose that cell sensitivity and death pattern could change during the different phases of cellular cycle.
Di Pietro
Angela
A
Department of Hygiene, Public Health and Preventive Medicine, University of Messina, Italy.
Picerno
Isa
I
Visalli
Giuseppa
G
Chirico
Cristina
C
Spataro
Pasquale
P
Cannavò
Giuseppe
G
Scoglio
Maria E
ME
D016980:Aeromonas hydrophila / Q000472:pathogenicity*; D000818:Animals; D017209:Apoptosis; D016923:Cell Death; D002470:Cell Survival; D002522:Chlorocebus aethiops; D003593:Cytoplasm / Q000382:microbiology / Q000648:ultrastructure*; D005098:Exotoxins / Q000633:toxicity*; D009336:Necrosis; D011700:Putrescine / Q000378:metabolism; D011503:Transglutaminases / Q000378:metabolism; D014617:Vacuoles / Q000648:ultrastructure*; D014709:Vero Cells
D005098:Exotoxins; D011503:Transglutaminases; D011700:Putrescine