Localization patterns of steroid and luteinizing hormone receptors in the corpus luteum of Nelore (Bos taurus indicus) cows throughout the estrous cycle

The aim of the present study was to detect progesterone receptors (A and B isoforms), α and β estrogen receptors, luteinizing hormone receptors and aromatase cytochrome P450 enzymes in the corpus luteum of Nelore (Bos taurus indicus) cows using immunohistochemistry. The estrous cycles of 16 Nelore cows were synchronized, and luteal samples were collected via an incision into the vaginal vault. Samples were collected during specific days of the estrous cycle (days 6, 10, 15 and 18) and 24. h after circulating progesterone dropped, after luteolysis had occurred. After each biopsy was taken, all animals were resynchronized so that each biopsy was performed during a different estrous cycle. Our results showed that the concentration of studied proteins vary throughout the bovine estrous cycle. The highest concentration of α and β estrogen receptors and the highest concentration of plasma progesterone were both observed on days 10 and 15 of the estrous cycle. The highest concentration of progesterone receptors was observed on days 6 and 10 of the estrous cycle, and the most intense immunostaining for cytochrome P450 aromatase enzymes was observed on day 10 of the estrous cycle. The highest score of cells with plasma membrane immunostaining for LH receptors was observed on day 15 of the estrous cycle. In conclusion, this study demonstrates the varying concentrations of specific proteins within the corpus luteum of Nelore cows during the estrous cycle. This finding suggests that these receptors and enzymes, and their interactions, are important in regulating luteal viability. © 2013 Elsevier B.V.

Actividades de la Secretaría de la CEPAL con relación a la integración de la mujer en el desarrollo económico y social de América Latina y el Caribe desde el 1 de agosto de 1989 hasta el 30 de abril de 1990

Incluye Bibliografía

Actividades de la Secretaría de la CEPAL con relación a la integración de la mujer en el desarrollo económico y social de América Latina y el Caribe desde el 1o de mayo hasta el 15 de noviembre de 1990 = Activities of the ECLAC Secretariat in the area of the integration of women into the economic and social development of Latin America and the Caribbean, 1 May-15 November 1990

Incluye Bibliografía

Medium-term plan 1990-1995 = Plan de mediano plazo 1990-1995

Revisa las actividades que debera realizar el Comite de Cooperacion y Desarrollo del Caribe (CDCC) en el marco del plan de mediano plazo 1990-1995.

Draft summary of proposed work programme output for the 1990-1991 biennium

Includes bibliography

Work programme of the ECLAC Subregional Headquarters for the Caribbean for the first period of the 1990-1991 biennium

Presenta el programa de trabajo para 1990 e incluye las actividades no finalizadas en 1989.

Progress report on the implementation of the CDCC work programme for the first quarter 1990

Informe de las actividades realizadas desde el duodécimo período de sesiones del CDCC.

Proposed changes to the 1990-91 work programme

Contiene los cambios propuestos al programa de trabajo 1990-91 por elementos de programa.

Implementación del programa de trabajo del Comité de Desarrollo y Cooperación del Caribe, 1990-1991 = Implementation of the work programme of the Caribbean Development and Co-operation Committee, 1990-1991

Presenta las actividades llevadas a cabo por la Secretaría del CDCC, desde diciembre de 1989 a marzo de 1991, y una breve descripción de las actividades no realizadas o descontinuadas.

Report to the Caribbean Development and Co-operation Committee (CDCC) on activities of the Caribbean Council for Science and Technology (CCST) for the period 1984-1990

Describe los objetivos del CCCT, su programa de trabajo, proyectos, y actividades realizadas entre 1984 y 1990.

Desenvolvimento do omaso de bovinos da raça Nelore (Bos taurus indicus) durante o período pré-natal

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)