Enhanced growth by ectopic expression of growth hormone releasing hormone using an injectable myogenic vector.
basic_science · Level V
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Abstract
Ectopic expression of a truncated growth hormone-releasing hormone (GHRH) from muscle tissues by a myogenic plasmid DNA vector directed by the skeletal alpha-actin promoter, pSK-GHRH, results in growth hormone (GH) secretion. Skeletal muscle-secreted GHRH is biologically active. The application of conditioned media harvested from pSK-GHRH transfected muscle cells to cultured pig primary anterior pituitary cells elicits GH release. A single intramuscular injection of 100 micrograms pSK-GHRH DNA elevates serum GH levels threefold to fourfold for up to 2 weeks, enhancing liver IGF-1 gene expression and increasing body weight approximately 10%.
Medical subject headings
- Genetic Vectors
- Growth Hormone-Releasing Hormone
- Muscle, Skeletal