Growth hormone: somatotropin - Regulators of GH secretion - IGF-1

6 important questions on Growth hormone: somatotropin - Regulators of GH secretion - IGF-1

What is the half life of somatomedins?

~12 hours

What makes IGF-1 different from GH?

- Inhibits liver glucose release
- Decreases plasma glucose concentration
- Increases insulin sensitivity in tissues
- Decreases lipolysis in adipocytes

What happens with GH and IGF-1 when blood glucose is low?

1. GHRH released, GH secreted
2. Liver -> Glyconeolysis and gluconeogenesis to raise blood glucose and reduce glucose utilization
3. IGF-1 produced, increases somatostatin secretion, which decreases GH secretion -> increases glucose utilization, less glyconeolysis and gluconeogenesis and lowers blood glucose
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What happens with GH and IGF-1 in low blood fatty acids?

1. GHRH released, GH secreted
2. Adipose tissue -> lipolysis to increase fatty acid release for energy
3. IGF-1 produced, somatostatin released, which decreases GH secretion, lipolysis decreased

How do GH and IGF-1 work together in bone formation?

1. GHRH produced, GH secreted
2. Liver -> IGF-1 produced, directly promotes bone growth and mineralization via increased chondroblast and osteocyte activity
3. IGF-1 also increases somatostatin secretion to regulate excessive growth

What are complications associated with GF use in animals?

1. Increased stress
2. Increased disease (e.g. Mastitis)
3. Adverse effects on reproduction (ovarian cysts, uterine disorders, gestation length differences)

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