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Participation of PLA2 and PLC in DhL-induced activation of Rhinella arenarum oocytes

Published online by Cambridge University Press:  09 September 2015

J. Zapata-Martínez ,
M.F. Medina ,
M.C. Gramajo-Bühler  and
G. Sánchez-Toranzo
J. Zapata-Martínez
Affiliation:
Departamento de Biología del Desarrollo (INSIBIO), Chacabuco 461, 4000 – San Miguel de Tucumán, Argentina.
M.F. Medina
Affiliation:
Departamento de Biología del Desarrollo (INSIBIO), Chacabuco 461, 4000 – San Miguel de Tucumán, Argentina.
M.C. Gramajo-Bühler
Affiliation:
Departamento de Biología del Desarrollo (INSIBIO), Chacabuco 461, 4000 – San Miguel de Tucumán, Argentina.
G. Sánchez-Toranzo*
Affiliation:
Departamento de Biología del Desarrollo (INSIBIO), Chacabuco 461, 4000 – San Miguel de Tucumán, Argentina.
*
All correspondence to: Graciela Sánchez-Toranzo. Departamento de Biología del Desarrollo (INSIBIO), Chacabuco 461, 4000 – San Miguel de Tucumán, Argentina. Fax: +54 381 4248025. E-mail: gsancheztoranzo@hotmail.com
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Summary

Rhinella arenarum oocytes can be artificially activated, a process known as parthenogenesis, by a sesquiterpenic lactone of the guaianolide group, dehydroleucodine (DhL). Transient increases in the concentration of cytosolic Ca2+ are essential to trigger egg activation events. In this sense, the 1-4-5 inositol triphosphate receptors (IP3R) seem to be involved in the Ca2+ transient release induced by DhL in this species. We analyzed the involvement of phosphoinositide metabolism, especially the participation of phospholipase A2 (PLA2) and phospholipase C (PLC) in DhL-induced activation. Different doses of quinacrine, aristolochic acid (ATA) (PLA2 inhibitors) or neomycin, an antibiotic that binds to PIP2, thus preventing its hydrolysis, were used in mature Rhinella arenarum oocytes. In order to assay the participation of PI-PLC and PC- PLC we used U73122, a competitive inhibitor of PI-PLC dependent events and D609, an inhibitor of PC-PLC. We found that PLA2 inhibits quinacrine more effectively than ATA. This difference could be explained by the fact that quinacrine is not a specific inhibitor for PLA2 while ATA is specific for this enzyme. With respect to the participation of PLC, a higher decrease in oocyte activation was detected when cells were exposed to neomycin. Inhibition of PC-PLC with D609 and IP-PLC with U73122 indicated that the last PLC has a significant participation in the effect of DhL-induced activation. Results would indicate that DhL induces activation of in vitro matured oocytes of Rhinella arenarum by activation of IP-PLC, which in turn may induce IP3 formation which produces Ca2+ release.

Keywords

AmphibianDehydroleucodineMeiosisOocyte activationSesquiterpene lactones
Type
Research Article
Information
Zygote , Volume 24 , Issue 4 , August 2016 , pp. 495 - 501
Copyright
Copyright © Cambridge University Press 2015 

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