Luteal development and progesterone levels during pregnancy of the viviparous temperate lizard Barisia imbricata imbricata (Reptilia: Anguidae)

Martı́nez-Torres, Martı́n; Hernández-Caballero, Marta Elena; Álvarez-Rodríguez, Carmen; Luis-Díaz, Juana Alba; Ortíz-López, Guadalupe

doi:10.1016/s0016-6480(02)00607-x

Cited by 23 publications

(22 citation statements)

References 35 publications

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“…Dentro de los reptiles existe gran variabilidad en cuanto a su morfología, su secreción y el tiempo de regresión, en relación con el modelo de desarrollo embrionario (Goldberg 1970, Guillete et al 1981. En los escamados ovíparos está activo durante el periodo de gravidez y su regresión es previa a la oviposición, mientras que en las especies vivíparas su actividad es muy variable (Martínez-Torres et al 2003). La estructura de los cuerpos lúteos de L. azarai fue semejante a la descripta para otros lagartos (Guillette et al 1981, Gómez y Ramírez 2004, Manes et al 2007, cuerpos lúteos en estadio III corresponden a un estado de desarrollo embrionario inicial, mientras que el estadio IV, donde se evidencia la máxima actividad secretoria, corresponde a la fase de organogénesis temprana.…”

Section: Discussionunclassified

“…Se realizó la caracterización histológica y la clasificación de los estadios de la ovogénesis y foliculogénesis siguiendo la clasificación propuesta por Uribe et al (1995). Los estadios de los cuerpos lúteos se identificaron a partir de lo descripto por Martínez-Torres et al (2003). Los estadios embrionarios (E.) fueron determinados a partir de la tabla de Dufaure y Hubert (1961) (D-H).…”

Section: Obtención De Muestras Histológicasunclassified

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Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

2017

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RESUMENEl estudio de la estructura ovárica y sus variaciones estacionales resulta fundamental para interpretar las estrategias reproductivas de los reptiles. Se analizó la morfología e histología del ovario de Liolaemus azarai a fin de caracterizar sus cambios y ofrecer información para determinar su ciclo reproductivo. Se registró, un nido germinal por ovario, con ovogonias y ovocitos primarios lo que evidencia que la capacidad proliferativa de la línea germinal se mantiene en el estado adulto. Durante la previtelogénesis, en todas las hembras capturadas, se verificó un incremento de hasta 30 veces el tamaño del ovocito debido al aumento del contenido citoplasmático, distinguiéndose una capa folicular con tres tipos celulares. La vitelogénesis se caracterizó por la incorporación del vitelo al ovocito y por las modificaciones que sufrió el epitelio folicular, el cual quedó formado por células planas, esta etapa se observó en septiembre, octubre, noviembre y diciembre. Se observaron cuerpos lúteos en estado avanzado del desarrollo, en octubre y en diciembre, coincidiendo con el grado de desarrollo embrionario intrauterino. Folículos atresicos se observaron en octubre y diciembre. La atresia temprana se evidenció fagocitosis del ovocito, abundantes células foliculares e invasión de células sanguíneas, mientras que en estados de atresia avanzada se observó la presencia de células autofágicas. Los resultados constituyen el primer aporte al conocimiento de la dinámica folicular de L. azarai y servirán como base para interpretar el ciclo reproductivo y desarrollo embrionario aún desconocidos para la especie.Palabras clave. Atresia, cuerpos lúteos, folículos, lagartija, ovario. ABSTRACTThe knowledge of ovarian morphology and its seasonal variations is essential to interpret the reproductive strategies of reptiles. The ovarian morphology and histology of Liolaemus azarai, was analyzed in order to characterize its changes and to provide information to determine their reproductive cycle. One germinal bed per ovary with oogonia and primary oocytes, it demonstrates that the proliferative activity of the germ line is maintained in adult. During previtellogenic stages, all of the females captured, the oocyte grows near 30 times due to increase of cytoplasmic contents, and follicular layer with three types of cells develops. The vitellogenic stages are characterized by the incorporation of the yolk platelets and important modifications in the follicular epithelium, is organized in a layer of flats cells, this time were observed in September, October, November and December. The corpora lutea was observed in an advanced stage of development, in October and December, according to the degree of intrauterine embryonic development. The atretic follicles were observed in October and December. The early atretic showed oocyte phagocytosis, abundant follicular cells and invation of blood cells;

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Section: Discussionunclassified

Section: Obtención De Muestras Histológicasunclassified

Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

2017

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“…For this species, vitellogenesis begins in late summer (late August or early September), mating takes place in October and ovulation occurs during November and early December [18]. Gestation lasts throughout the winter and a substantial part of the spring [19,20]. Luteal tissue develops after ovulation during the first third of gestation and persists throughout the pregnancy [20], though the first regressive changes are observed early in the second third.…”

Section: Introductionmentioning

confidence: 99%

“…Gestation lasts throughout the winter and a substantial part of the spring [19,20]. Luteal tissue develops after ovulation during the first third of gestation and persists throughout the pregnancy [20], though the first regressive changes are observed early in the second third. The regression of luteal tissue advances gradually, and parturition does not occur until late May or June [21].…”

Section: Introductionmentioning

confidence: 99%

“…The regression of luteal tissue advances gradually, and parturition does not occur until late May or June [21]. However, several evidences suggest that the CL is the main site of P 4 production during gestation in B. i. imbricata [20]. The activity of 3β-hydroxyl steroid dehydrogenase Δ 5-4 isomerase (Δ 5-4 3β-HSD) has been detected in the CL of B. i. imbricata throughout gestation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of luteectomy in early pregnancy on the maintenance of gestation and plasma progesterone concentrations in the viviparous temperate lizard Barisia imbricata imbricata

Martı́nez-Torres

Hernández-Caballero

Luis-Díaz

et al. 2010

Reprod Biol Endocrinol

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BackgroundSeveral studies have shown that the corpus luteum is the principal source of progesterone during the gravidity period in reptiles; however, its participation in the maintenance of gestation in the viviparous squamata is in dispute. The effects of ovariectomy or luteectomy vary according to the species and the time at which the procedure is performed. In this paper, we describe the effects of luteectomy during early pregnancy on the maintenance of gestation and progesterone concentrations in the temperate Mexican viviparous lizard Barisia imbricata imbricata.MethodsTwenty-four lizards were subjected to three different treatments: luteectomy, sham luteectomy or non-surgical treatment, and blood samples were obtained before and after surgical treatment at different stages of gestation to determine the effects of luteectomy on the maintenance of gestation and progesterone concentrations.ResultsSpontaneous abortion was not observed in any of the females. However, luteectomy provoked abnormal parturition and a significant reduction in the number of young born alive. Parturition was normal in untreated females as well as those submitted to sham luteectomy. The surgical treatment also caused a significant reduction in progesterone concentrations in luteectomised females during early and middle gestation. However, no significant differences in hormone concentrations were observed among the three groups during late gestation or immediately post-parturition.ConclusionsOur observations indicate that the presence of the corpus luteum is not necesary for the maintenance of gestation, but that it does participate in parturition control. Moreover, the corpus luteum of the viviparous lizard B. i. imbricata produces progesterone, at least during the first half of pregnancy, and that an extra-ovarian source of progesterone must maintain gestation in the absence of luteal tissue.

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Spermiogenesis in the imbricate alligator lizard,Barisia imbricata(Reptilia, Squamata, Anguidae)

Gribbins

Rheubert

Touzinsky

et al. 2013

Journal of Morphology

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Although the events of spermiogenesis are commonly studied in amniotes, the amount of research available for Squamata is lacking. Many studies have described the morphological characteristics of mature spermatozoa in squamates, but few detail the ultrastructural changes that occur during spermiogenesis. This study's purpose is to gain a better understanding of the subcellular events of spermatid development within the Imbricate Alligator Lizard, Barisia imbricata. The morphological data presented here represent the first complete ultrastructural study of spermiogenesis within the family Anguidae. Samples of testes from four specimens collected on the northwest side of the Nevado de Toluca, México, were prepared using standard techniques for transmission electron microscopy. Many of the ultrastructural changes occurring during spermiogenesis within B. imbricata are similar to that of other squamates (i.e., early acrosome formation, chromatin condensation, flagella formation, annulus present, and a prominent manchette). However, there are a few unique characteristics within B. imbricata spermatids that to date have not been described during spermiogenesis in other squamates. For example, penetration of the acrosomal granule into the subacrosomal space to form the basal plate of the perforatorium during round spermatid development, the clover-shaped morphology of the developing nuclear fossa of the flagellum, and the bulbous shape to the perforatorium are all unique to the Imbricate Alligator Lizard. These anatomical character differences may be valuable nontraditional data that along with more traditional matrices (such as DNA sequences and gross morphological data) may help elucidate phylogenetic relationships, which are historically considered controversial within Squamata.

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Luteal development and progesterone levels during pregnancy of the viviparous temperate lizard Barisia imbricata imbricata (Reptilia: Anguidae)

Cited by 23 publications

References 35 publications

Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

Effects of luteectomy in early pregnancy on the maintenance of gestation and plasma progesterone concentrations in the viviparous temperate lizard Barisia imbricata imbricata

Spermiogenesis in the imbricate alligator lizard,Barisia imbricata(Reptilia, Squamata, Anguidae)

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