Increase of intracellular Ca2+ concentration by Vibrio vulnificus cytolysin in rat platelets; triggering mechanism of platelet cytolysis
The Korean Journal of Physiology and Pharmacology
;
: 199-205, 1999.
Article
Dans Anglais
| WPRIM
| ID: wpr-728416
ABSTRACT
Vibrio vulnificus cytolysin caused platelet cytolysis and increased intracellular calcium concentration ((Ca2+))i) of rat platelets in a concentration-dependent manner. In the presence of V. vulnificus cytolysin (3 HU/ml), lactate dehydrogenase (LDH) activity was increased from 1.3+/-0.4% of control to 64.3+/-3.4% in platelet suspension buffer. In Ca2+-free platelet suspension buffer, however, V. vulnificus cytolysin did not induce (Ca2+)i increase and LDH release. Addition of EGTA (2 mM) to suspension buffer after the initial Ca2+ influx reversed (Ca2+)i to the control level. However, a Ca2+ channel blocker verapamil (20 muM) or mefenamic acid (20 muM) did not inhibit V. vulnificus cytolysin-induced (Ca2+)i increase and LDH release. Divalent cations such as Co2+, Cd2+ or Mn2+ (2 mM each) also did not alter V. vulnificus cytolysin-induced (Ca2+)i increase and LDH release. V. vulnificus cytolysin (3 HU/ml)-induced calcium influx was completely blocked by lanthanum (2 mM). Lanthanum (2 mM) also completely blocked V. vulnificus cytolysin (3 HU/ml)-induced LDH release. Osmotic protectants such as, raffinose, sucrose or PEG600 (50 mM each) did not inhibit the lytic activity of V. vulnificus cytolysin. In conclusion, lanthanum sensitive Ca2+ influx plays a significant role in Vibrio vulnificus cytolysin-induced platelet cytolysis and thrombocytopenia in V. vulnificus infection.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Raffinose
/
Saccharose
/
Thrombopénie
/
Vibrio
/
Plaquettes
/
Vérapamil
/
Cations divalents
/
Acide méfénamique
/
Calcium
/
Acide egtazique
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
The Korean Journal of Physiology and Pharmacology
Année:
1999
Type:
Article
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