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Relationship between Release of LH and Incorporation of Tritiated Thymidine in the Anterior Pituitary Gland of the Castrated Male Rat: Effect of LHRH and its Highly Active Analogue Buserelin

Marta Romano, Gloria A. Machiavelli, G. Alonso, J. A. Burdman

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Abstract

Castration of the adult male rat significantly (P less than 0.01) increased the concentration of LH in serum and the incorporation of (3H) thymidine into the pituitary DNA. The administration of a single dose of LHRH or its analogue buserelin stimulated the release of LH but it did not modify (3H) thymidine incorporation. When multiple doses of LHRH or buserelin were injected, there was a significant (P less than 0.01) inhibition of LH release and also the incorporation of (3H) thymidine into the DNA of the anterior pituitary gland was significantly (P less than 0.01) diminished. These observations are compatible with the idea of the close relationship between hormonal release and DNA synthesis in the anterior pituitary gland of the rat.

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What this paper is about

Castration of the adult male rat significantly (P less than 0.01) increased the concentration of LH in serum and the incorporation of (3H) thymidine into the pituitary DNA. The administration of a single dose of LHRH or its analogue buserelin stimulated the release of LH but it did not modify (3H) thymidine incorporation. When multiple doses of LHRH or buserelin were injected, there was a significant (P less than 0.01) inhibition of LH release and also the incorporation of (3H) thymidine into the DNA of the anterior pituitary gland was significantly (P less than 0.01) diminished. These observations are compatible with the idea of the close relationship between hormonal release and DNA synthesis in the anterior pituitary gland of the rat.

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Available abstract

Castration of the adult male rat significantly (P less than 0.01) increased the concentration of LH in serum and the incorporation of (3H) thymidine into the pituitary DNA. The administration of a single dose of LHRH or its analogue buserelin stimulated the release of LH but it did not modify (3H) thymidine incorporation. When multiple doses of LHRH or buserelin were injected, there was a significant (P less than 0.01) inhibition of LH release and also the incorporation of (3H) thymidine into the DNA of the anterior pituitary gland was significantly (P less than 0.01) diminished. These observations are compatible with the idea of the close relationship between hormonal release and DNA synthesis in the anterior pituitary gland of the rat.

Key concepts: Buserelin, Internal medicine, Endocrinology, Thymidine, Anterior pituitary, Pituitary gland, Castration, Chemistry

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Relationship between Release of LH and Incorporation of Tritiated Thymidine in the Anterior Pituitary Gland of the Castrated Male Rat: Effect of LHRH and its Highly Active Analogue Buserelin — Research Paper | ScholarLens