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The effect of short-term GH treatment on steady-state insulin-like growth factor binding protein-3 (IGFBP-3) mRNA levels in liver, kidney, longissimus dorsi muscle, stomach and jejunum was examined in pigs. Ten female crossbred pigs were allocated to either saline or GH (70 microg/kg/day) treatment by subcutaneous injection for 4 days. They were allowed to feed ad libitum, and were weighed daily. At the end of the treatment period, the pigs were slaughtered and samples of liver, kidney, skeletal muscle, stomach and jejunum were collected and total RNA was extracted. Steady-state levels of IGFBP-3 mRNA were quantified by RNase protection assay and were compared with the level of IGF-I class 1 and class 2 transcripts. IGFBP-3 mRNA increased in response to GH in both liver and kidney, but not in the other tissues sampled. Hepatic IGF-I mRNA responded to short-term GH treatment with a fourfold increase in IGF-I class 1 mRNA and an eightfold increase in IGF-I class 2 mRNA, which was liver specific. IGF-I class 1 mRNA was not responsive to GH treatment in other tissues. The short-term nature of this treatment suggests that the increase in hepatic IGFBP-3 and IGF-I transcripts is a relatively early response to treatment with GH, and that the increase in plasma concentrations of IGFBP-3 in response to GH are derived from the liver, the kidney, or both.

Effect of growth hormone administration on IGF binding protein-3 mRNA levels in porcine tissues