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dc.contributor.author
Gallelli, Maria Florencia
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dc.contributor.author
Bianchi, Carolina Paula
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dc.contributor.author
Lombardo, Daniel Marcelo
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dc.contributor.author
Miragaya, Marcelo
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dc.date.available
2022-10-18T10:55:28Z
dc.date.issued
2018
dc.identifier.citation
IGF1R expression in alpaca (Vicugna pacos) ovaries: Preliminary results; 5th Conference of International Society of Camelid Research and Development; Laayoune; Marruecos; 2018; 147-148
dc.identifier.uri
http://hdl.handle.net/11336/173675
dc.description.abstract
Alpacas are induced ovulators requiring a stimulus in presence of a mature follicle to trigger the ovulatory process. In this species, ovarian activity occurs in waves of follicular growth and regression. During each follicular wave, one follicle becomes dominant, grows to maturity and finally regresses. Folliculogenesis and ovulation are regulated by gonadotrophins and other factors such as Insulin like growth factor 1 (IGF1). In various species it has been described that IGF1 stimulates proliferation and differentiation of granulose cells. Also, in cows, IGF1 receptor (IGF1R) shows different expression according to the size of follicles. As there are no reports about IGF1R expression in alpacas ovaries, the aim of the study was to evaluate IGF1R expression in alpacas ovaries and analyze if this expression is related to the presence of corpus luteum (CL).The ovaries of 10 alpacas (without CL: n=6, with CL: n=4) were obtained from ?Estación Experimental de altura de Chuquibambilla (Universidad Nacional del Altiplano, Puno, Perú). An immunohistochemical technique was used to detect IGF1R immunostaining in primary and secondary follicles, in granulosa and theca interna cells of tertiary follicles, and in luteal cells. Staining was then evaluated by two independent observers. IGF1R was evaluated as percentage of positive area and analyzed by Student?s t-test. The level of significance was P < 0.05.IGF1R positive area in primary follicles was 82% and 89% in ovaries with and without CL, respectively (p=0.7). Few secondary follicles were observed, and their positive area was around 75% in both groups. Greater staining was observed in granulosa cells of tertiary follicles of ovaries without CL compared with ovaries with CL (94% and 64%, respectively, p=0.0007). No significant differences were found in theca interna cells between groups (22% and 14% with and without CL, respectively, p= 0.11). In both groups, the immunostaining of granulosa cells was greater than theca interna cells (p=0.0016). IGF1R staining was observed in most of luteal cells (89% of positive area).In conclusion, it was demonstrated that IGF1R is expressed in alpaca ovarian follicles and in CL, suggesting a possible role of IGF in follicular development and CL function. Furthermore, IGF1R could be regulated by ovarian steroid hormones, since IGF1R expression was greater in granulosa cells in ovaries without CL, thus with basal progesterone concentrations.
dc.format
text/plain
dc.language.iso
eng
dc.publisher
International Society of Camelid Research and Development
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Igf1r
dc.subject
Alpaca
dc.subject
Ovaries
dc.subject
Sexual steroids
dc.subject.classification
Ciencias Veterinarias
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dc.subject.classification
Ciencias Veterinarias
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
IGF1R expression in alpaca (Vicugna pacos) ovaries: Preliminary results
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2022-09-29T14:56:36Z
dc.journal.pagination
147-148
dc.journal.pais
Emiratos Árabes Unidos
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dc.journal.ciudad
Abu Dabi
dc.description.fil
Fil: Gallelli, Maria Florencia. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Instituto de Investigación y Tecnología en Reproducción Animal; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Bianchi, Carolina Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
dc.description.fil
Fil: Lombardo, Daniel Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Instituto de Investigación y Tecnología en Reproducción Animal; Argentina
dc.description.fil
Fil: Miragaya, Marcelo. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Instituto de Investigación y Tecnología en Reproducción Animal; Argentina
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.phosboucraafoundation.org/isocard-international-society-camelid-research-and-development-hold-its-5th-conference-laayoune
dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.coverage
Internacional
dc.type.subtype
Conferencia
dc.description.nombreEvento
5th Conference of International Society of Camelid Research and Development
dc.date.evento
2018-11-12
dc.description.ciudadEvento
Laayoune
dc.description.paisEvento
Marruecos
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dc.type.publicacion
Book
dc.description.institucionOrganizadora
International Society of Camelid Research and Development
dc.source.libro
5th Conference of International Society of Camelid Research and Development
dc.source.revista
ISOCARD-2018 conference proceedings
dc.date.eventoHasta
2018-11-15
dc.type
Conferencia
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