Biotechnology

Download Biotechnology in Growth Regulation by R.B. Heap, C.G. Prosser and G.E. Lamming (Eds.) PDF

By R.B. Heap, C.G. Prosser and G.E. Lamming (Eds.)

This e-book appears to be like on the use of development hormones in animal construction. It bargains with the topic on a variety of degrees, from the connection of the expansion hormone to comparable proteins, to the particular insertion of development genes into animal embryos

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Extra resources for Biotechnology in Growth Regulation

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Makara. B. L. (1984). Site of γ-aminobutyric acid (GABA)-mediated inhibition of growth hormone secretion in the rat. Neuroendocrinology 39, 510-515. 13 Frawley. S. and Neill. D. (1984). A reverse hemolytic placjue assay for microscopic visualisation of growth hormone release from individual cells: evidence for somatotrope heterogeneity. Neuroendocrinology 39, 484-487. 14 Fukata. J.. Diamond. J. and Martin. B. (1985). Effects of rat growth hormone (rGH)-releasing factor and somatostatin on the release and synthesis of rGH in dispersed pituitary cells.

However the data are too limited at this time to assess the role of the pattern of GH secretion in determining tissue responsiveness. Nutrition Nutrition has a dominant influence on responsivity to G H . Observations in the fasted rat show that fasting leads to a rapid fall in UH binding to liver and binding is restored quickly on refeeding (26). Plasma IGF-I levels paralleled the changes in GH binding. With relative milk deprivation GH binding was depressed by 14 days postnatal, soon after GH receptors appear in this species (28).

G H R H C O N T R O L OF G H R E L E A S E Initial experiments with natural and synthetic GHRH biological potency in the picomolar range to stimulate cell monolayer cultures. GHRH also stimulates synthesis transcription of the GH gene (2), and the production of peptides demonstrated a high GH release using rat pituitary of GH ( 14), presumably via the GH mRNA (17). GHRH appears to exert its influence on the somatotroph cell by activating adenylate / cyclase ( A C ) to produce the intracellular messenger cyclic adenosine-3 ,5 -monophosphate ( c A M P ) (3).

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