Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura)
In Rhinella arenarum spermiation occurs as a consequence of LH/FSH increase during the amplexus or by a single dose of hCG, among other gonadotropins. The present study employs an in vitro system to study the mechanism of action of hCG in the spermiation of R. arenarum. Testicular fragments were inc...
Guardado en:
Autores principales: | , |
---|---|
Publicado: |
2010
|
Materias: | |
Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166480_v169_n3_p197_Volonteri http://hdl.handle.net/20.500.12110/paper_00166480_v169_n3_p197_Volonteri |
Aporte de: |
id |
paper:paper_00166480_v169_n3_p197_Volonteri |
---|---|
record_format |
dspace |
spelling |
paper:paper_00166480_v169_n3_p197_Volonteri2023-06-08T14:38:18Z Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) Volonteri, María Clara Ceballos, Nora Raquel HCG PKA Spermiation Toad adenosine triphosphatase (potassium sodium) amiloride chorionic gonadotropin cyclic AMP dependent protein kinase cyclic AMP dependent protein kinase inhibitor ouabain protein kinase C inhibitor Amphibia animal tissue article concentration response controlled study enzyme activation enzyme activity enzyme inhibition hormone action hormone release in vitro study male nonhuman priority journal Rhinella arenarum sodium transport spermatogenesis spermiation steroidogenesis In Rhinella arenarum spermiation occurs as a consequence of LH/FSH increase during the amplexus or by a single dose of hCG, among other gonadotropins. The present study employs an in vitro system to study the mechanism of action of hCG in the spermiation of R. arenarum. Testicular fragments were incubated for 2h at 28°C in the presence or absence of 20IU hCG with or without different PKA/PKC inhibitors and activators as well as ouabain and amiloride as Na+/K+ ATPase and transcellular Na+ transport inhibitors, respectively. Ouabain did not induce spermiation in absence of hCG and inhibited hCG-induced spermiation in a dose-dependent manner, reaching 90% inhibition with the higher concentration. In contrast, amiloride neither affected spermiation nor steroidogenesis. Activation of PKA with 8Br-cAMP induced spermiation in the absence of hCG while its inhibition with H89 blocked hCG action. On the other hand, PKC inhibition with Bi or STP did not affect hCG-induced spermiation although PKC activation significantly decreased hCG-dependent sperm release. These results suggest that PKC inhibits spermiation but also that the inhibition exerted by the kinase could be blocked by hCG. Taken together, these observations could indicate that PKA is involved in the mechanism of the gonadotropin action, mechanism also requiring the activation of a non-pumping Na+/K+ ATPase pathway. © 2010 Elsevier Inc. Fil:Volonteri, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ceballos, N.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166480_v169_n3_p197_Volonteri http://hdl.handle.net/20.500.12110/paper_00166480_v169_n3_p197_Volonteri |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
HCG PKA Spermiation Toad adenosine triphosphatase (potassium sodium) amiloride chorionic gonadotropin cyclic AMP dependent protein kinase cyclic AMP dependent protein kinase inhibitor ouabain protein kinase C inhibitor Amphibia animal tissue article concentration response controlled study enzyme activation enzyme activity enzyme inhibition hormone action hormone release in vitro study male nonhuman priority journal Rhinella arenarum sodium transport spermatogenesis spermiation steroidogenesis |
spellingShingle |
HCG PKA Spermiation Toad adenosine triphosphatase (potassium sodium) amiloride chorionic gonadotropin cyclic AMP dependent protein kinase cyclic AMP dependent protein kinase inhibitor ouabain protein kinase C inhibitor Amphibia animal tissue article concentration response controlled study enzyme activation enzyme activity enzyme inhibition hormone action hormone release in vitro study male nonhuman priority journal Rhinella arenarum sodium transport spermatogenesis spermiation steroidogenesis Volonteri, María Clara Ceballos, Nora Raquel Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
topic_facet |
HCG PKA Spermiation Toad adenosine triphosphatase (potassium sodium) amiloride chorionic gonadotropin cyclic AMP dependent protein kinase cyclic AMP dependent protein kinase inhibitor ouabain protein kinase C inhibitor Amphibia animal tissue article concentration response controlled study enzyme activation enzyme activity enzyme inhibition hormone action hormone release in vitro study male nonhuman priority journal Rhinella arenarum sodium transport spermatogenesis spermiation steroidogenesis |
description |
In Rhinella arenarum spermiation occurs as a consequence of LH/FSH increase during the amplexus or by a single dose of hCG, among other gonadotropins. The present study employs an in vitro system to study the mechanism of action of hCG in the spermiation of R. arenarum. Testicular fragments were incubated for 2h at 28°C in the presence or absence of 20IU hCG with or without different PKA/PKC inhibitors and activators as well as ouabain and amiloride as Na+/K+ ATPase and transcellular Na+ transport inhibitors, respectively. Ouabain did not induce spermiation in absence of hCG and inhibited hCG-induced spermiation in a dose-dependent manner, reaching 90% inhibition with the higher concentration. In contrast, amiloride neither affected spermiation nor steroidogenesis. Activation of PKA with 8Br-cAMP induced spermiation in the absence of hCG while its inhibition with H89 blocked hCG action. On the other hand, PKC inhibition with Bi or STP did not affect hCG-induced spermiation although PKC activation significantly decreased hCG-dependent sperm release. These results suggest that PKC inhibits spermiation but also that the inhibition exerted by the kinase could be blocked by hCG. Taken together, these observations could indicate that PKA is involved in the mechanism of the gonadotropin action, mechanism also requiring the activation of a non-pumping Na+/K+ ATPase pathway. © 2010 Elsevier Inc. |
author |
Volonteri, María Clara Ceballos, Nora Raquel |
author_facet |
Volonteri, María Clara Ceballos, Nora Raquel |
author_sort |
Volonteri, María Clara |
title |
Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
title_short |
Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
title_full |
Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
title_fullStr |
Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
title_full_unstemmed |
Mechanism of hCG-induced spermiation in the toad Rhinella arenarum (Amphibia, Anura) |
title_sort |
mechanism of hcg-induced spermiation in the toad rhinella arenarum (amphibia, anura) |
publishDate |
2010 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166480_v169_n3_p197_Volonteri http://hdl.handle.net/20.500.12110/paper_00166480_v169_n3_p197_Volonteri |
work_keys_str_mv |
AT volonterimariaclara mechanismofhcginducedspermiationinthetoadrhinellaarenarumamphibiaanura AT ceballosnoraraquel mechanismofhcginducedspermiationinthetoadrhinellaarenarumamphibiaanura |
_version_ |
1768546098583961600 |