Acute effects of insulin-like growth factor-1 and recombinant growth hormone on liporotein(a) levels in baboons

Metabolism: Clinical and Experimental
Xing Li WangDavid L Rainwater

Abstract

Elevated lipoprotein(a) [Lp(a)] is an established factor for coronary artery disease (CAD) that acts possibly by increasing cholesterol deposition in arterial wall and promoting thrombosis. The only known Lp(a)-lowering agents, niacin and neomycin, often produce intolerable side effects. We observed that administration of growth hormone (GH) increases but insulin-like growth factor-1 (IGF-1) decreases Lp(a) levels in patients with GH deficiency. To explore the mechanisms for the hormonal effects and to search for an effective pharmaceutical agent, we examined the suitability of the baboon as an animal model by investigating the effects of GH and IGF-1 on Lp(a). We selected 5 baboons with high (group 1) and 5 with low (group 2) Lp(a) levels. Group 1 baboons first received a bolus subcutaneous injection of IGF-1 (300 microg/kg body weight). After a period of 7 days, they were given a bolus infusion of recombinant human (rh)GH (300 microg/kg body weight). For group 2 baboons, the order of injection was reversed, and rhGH was given first and followed by IGF-1. Blood samples were collected during the day before and for 3 days following each injection. Levels of plasma Lp(a), insulin, GH, and IGF-1 were measured for each time point. ...Continue Reading

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