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      Effects of Intermittent Growth Hormone or Insulin-Like Growth Factor 1 Administration in the Neonatal Dwarf Rat

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          To further evaluate the role of growth hormone (GH) in the neonatal period, the effects of GH or insulin-like growth factor 1 (IGF-1) administration were studied in the neonatal GH-defïcient rat. Groups of pups from newborn litters were randomized to receive twice daily subcutaneous injections of recombinant bovine growth hormone (bGH, 5 μg), recombinant human IGF-1 (10 μg) or saline from the second to twelfth day of life. The effects on growth parameters, serum IGF-1 concentration, body composition and hepatic GH receptor binding were assessed. bGH-treated animals showed increases in body weight gain (p = 0.01), serum IGF-1 (p < 0.01), carcass nitrogen (p < 0.001) and carcass water (p < 0.001) compared to IGF-1 or saline-treated animals. No differences in these parameters were noted between IGF-1 and saline-treated groups. bGH-treated animals showed a significantly lower hepatic GH receptor binding (p < 0.01) compared to the other two groups. The demonstration of anabolic responses to GH administration in the neonatal period has implications for the possible role of GH in fetal and neonatal growth.

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          Author and article information

          Horm Res Paediatr
          Hormone Research in Paediatrics
          S. Karger AG
          05 December 2008
          : 40
          : 5-6
          : 178-183
          aResearch Centre for Developmental Medicine and Biology, Department of Paediatrics, University of Auckland, and bDepartment of Animal Science, Massey University, Palmerston North, New Zealand
          183791 Horm Res 1993;40:178–183
          © 1993 S. Karger AG, Basel

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          Pages: 6
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