Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment

Autores
Filippa, Veronica Palmira; Penissi, Alicia Beatriz; Mohamed, Fabian Heber
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The gonadotropes, LH and FSH cells, were immunohistochemically identified in the pituitary pars distalis of the adult male viscacha (Lagostomus maximus maximus) using specific antibodies against hLHb and hFSHb with the streptavidin-biotin-peroxidase complex. The distribution, size and percentage immunopositive area of these cells were analyzed by image analysis in viscachas captured during the annual reproductive cycle and after the chronic administration of melatonin. The LHb and FSHb cells showed seasonal changes in the distribution, size and percentage immunopositive area. The LHb cells were found widely distributed throughout the pars distalis during the reproductive period, and they were found in the ventro-medial region in the pars distalis during the gonadal regression and gonadal recovery periods. The LHb cells reached the largest size and immunopositive area during the reproductive period and the smallest size and immunopositive area during the gonadal regression period. The FSHb cells were found in the ventromedial region during reproductive and gonadal regression periods. The FSHb cells were found widely distributed throughout the pars distalis during the gonadal recovery period when they showed the maximum percentage immunopositive area. A decrease in the size of LHb and FSHb cells was observed after the chronic administration of melatonin. Moreover, it produces a decrease in the immunopositive area occupied by the LHb cells but not in the immunopositive area occupied by the FSHb cells. Our results show great activity of LHb and FSHb cells in different moments of the annual reproductive cycle demonstrating that these cells do not secrete in parallel. Moreover, melatonin acts differentially on the activity of the gonadotrope cells.
Fil: Filippa, Veronica Palmira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
Fil: Penissi, Alicia Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mendoza. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem | Universidad Nacional de Cuyo. Facultad de Ciencias Medicas. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem.; Argentina
Fil: Mohamed, Fabian Heber. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
Materia
PITUITARY
LH
FSH
IMMUNOHISTOCHEMISTRY
VISCACHA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/159582
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/159582
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatmentFilippa, Veronica PalmiraPenissi, Alicia BeatrizMohamed, Fabian HeberPITUITARYLHFSHIMMUNOHISTOCHEMISTRYVISCACHAhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The gonadotropes, LH and FSH cells, were immunohistochemically identified in the pituitary pars distalis of the adult male viscacha (Lagostomus maximus maximus) using specific antibodies against hLHb and hFSHb with the streptavidin-biotin-peroxidase complex. The distribution, size and percentage immunopositive area of these cells were analyzed by image analysis in viscachas captured during the annual reproductive cycle and after the chronic administration of melatonin. The LHb and FSHb cells showed seasonal changes in the distribution, size and percentage immunopositive area. The LHb cells were found widely distributed throughout the pars distalis during the reproductive period, and they were found in the ventro-medial region in the pars distalis during the gonadal regression and gonadal recovery periods. The LHb cells reached the largest size and immunopositive area during the reproductive period and the smallest size and immunopositive area during the gonadal regression period. The FSHb cells were found in the ventromedial region during reproductive and gonadal regression periods. The FSHb cells were found widely distributed throughout the pars distalis during the gonadal recovery period when they showed the maximum percentage immunopositive area. A decrease in the size of LHb and FSHb cells was observed after the chronic administration of melatonin. Moreover, it produces a decrease in the immunopositive area occupied by the LHb cells but not in the immunopositive area occupied by the FSHb cells. Our results show great activity of LHb and FSHb cells in different moments of the annual reproductive cycle demonstrating that these cells do not secrete in parallel. Moreover, melatonin acts differentially on the activity of the gonadotrope cells.Fil: Filippa, Veronica Palmira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaFil: Penissi, Alicia Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mendoza. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem | Universidad Nacional de Cuyo. Facultad de Ciencias Medicas. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem.; ArgentinaFil: Mohamed, Fabian Heber. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaSocietà Italiana di Istochimica2005-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/159582Filippa, Veronica Palmira; Penissi, Alicia Beatriz; Mohamed, Fabian Heber; Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment; Società Italiana di Istochimica; European Journal of Histochemistry; 49; 3; 12-2005; 291-3001121-760X2038-8306CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.ejh.it/index.php/ejh/article/view/956info:eu-repo/semantics/altIdentifier/doi/10.4081/956info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:44:50Zoai:ri.conicet.gov.ar:11336/159582instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:44:50.336CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
title Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
spellingShingle Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
Filippa, Veronica Palmira
PITUITARY
LH
FSH
IMMUNOHISTOCHEMISTRY
VISCACHA
title_short Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
title_full Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
title_fullStr Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
title_full_unstemmed Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
title_sort Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment
dc.creator.none.fl_str_mv Filippa, Veronica Palmira
Penissi, Alicia Beatriz
Mohamed, Fabian Heber
author Filippa, Veronica Palmira
author_facet Filippa, Veronica Palmira
Penissi, Alicia Beatriz
Mohamed, Fabian Heber
author_role author
author2 Penissi, Alicia Beatriz
Mohamed, Fabian Heber
author2_role author
author
dc.subject.none.fl_str_mv PITUITARY
LH
FSH
IMMUNOHISTOCHEMISTRY
VISCACHA
topic PITUITARY
LH
FSH
IMMUNOHISTOCHEMISTRY
VISCACHA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The gonadotropes, LH and FSH cells, were immunohistochemically identified in the pituitary pars distalis of the adult male viscacha (Lagostomus maximus maximus) using specific antibodies against hLHb and hFSHb with the streptavidin-biotin-peroxidase complex. The distribution, size and percentage immunopositive area of these cells were analyzed by image analysis in viscachas captured during the annual reproductive cycle and after the chronic administration of melatonin. The LHb and FSHb cells showed seasonal changes in the distribution, size and percentage immunopositive area. The LHb cells were found widely distributed throughout the pars distalis during the reproductive period, and they were found in the ventro-medial region in the pars distalis during the gonadal regression and gonadal recovery periods. The LHb cells reached the largest size and immunopositive area during the reproductive period and the smallest size and immunopositive area during the gonadal regression period. The FSHb cells were found in the ventromedial region during reproductive and gonadal regression periods. The FSHb cells were found widely distributed throughout the pars distalis during the gonadal recovery period when they showed the maximum percentage immunopositive area. A decrease in the size of LHb and FSHb cells was observed after the chronic administration of melatonin. Moreover, it produces a decrease in the immunopositive area occupied by the LHb cells but not in the immunopositive area occupied by the FSHb cells. Our results show great activity of LHb and FSHb cells in different moments of the annual reproductive cycle demonstrating that these cells do not secrete in parallel. Moreover, melatonin acts differentially on the activity of the gonadotrope cells.
Fil: Filippa, Veronica Palmira. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
Fil: Penissi, Alicia Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Mendoza. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem | Universidad Nacional de Cuyo. Facultad de Ciencias Medicas. Instituto de Histologia y Embriologia de Mendoza Dr. Mario H. Burgos. Grupo Vinculado de Investigacion y Desarrollo Biotecnologico Aplicado Al Diagnostico Al Ihem.; Argentina
Fil: Mohamed, Fabian Heber. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentina
description The gonadotropes, LH and FSH cells, were immunohistochemically identified in the pituitary pars distalis of the adult male viscacha (Lagostomus maximus maximus) using specific antibodies against hLHb and hFSHb with the streptavidin-biotin-peroxidase complex. The distribution, size and percentage immunopositive area of these cells were analyzed by image analysis in viscachas captured during the annual reproductive cycle and after the chronic administration of melatonin. The LHb and FSHb cells showed seasonal changes in the distribution, size and percentage immunopositive area. The LHb cells were found widely distributed throughout the pars distalis during the reproductive period, and they were found in the ventro-medial region in the pars distalis during the gonadal regression and gonadal recovery periods. The LHb cells reached the largest size and immunopositive area during the reproductive period and the smallest size and immunopositive area during the gonadal regression period. The FSHb cells were found in the ventromedial region during reproductive and gonadal regression periods. The FSHb cells were found widely distributed throughout the pars distalis during the gonadal recovery period when they showed the maximum percentage immunopositive area. A decrease in the size of LHb and FSHb cells was observed after the chronic administration of melatonin. Moreover, it produces a decrease in the immunopositive area occupied by the LHb cells but not in the immunopositive area occupied by the FSHb cells. Our results show great activity of LHb and FSHb cells in different moments of the annual reproductive cycle demonstrating that these cells do not secrete in parallel. Moreover, melatonin acts differentially on the activity of the gonadotrope cells.
publishDate 2005
dc.date.none.fl_str_mv 2005-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/159582
Filippa, Veronica Palmira; Penissi, Alicia Beatriz; Mohamed, Fabian Heber; Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment; Società Italiana di Istochimica; European Journal of Histochemistry; 49; 3; 12-2005; 291-300
1121-760X
2038-8306
CONICET Digital
CONICET
url http://hdl.handle.net/11336/159582
identifier_str_mv Filippa, Veronica Palmira; Penissi, Alicia Beatriz; Mohamed, Fabian Heber; Seasonal variations of gonadotropins in the pars distalis male viscacha pituitary: Effect of chronic melatonin treatment; Società Italiana di Istochimica; European Journal of Histochemistry; 49; 3; 12-2005; 291-300
1121-760X
2038-8306
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.ejh.it/index.php/ejh/article/view/956
info:eu-repo/semantics/altIdentifier/doi/10.4081/956
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Società Italiana di Istochimica
publisher.none.fl_str_mv Società Italiana di Istochimica
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.229304

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