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  • Title: Neonatal hyperthyroidism causes impairment in submandibular gland-nerve growth factor (SMG-NGF) ontogeny in mice.
    Author: Lakshmanan J.
    Journal: Acta Endocrinol (Copenh); 1986 May; 112(1):138-44. PubMed ID: 3716754.
    Abstract:
    The effect of neonatal hyperthyroidism on submandibular gland (SMG) nerve growth factor (NGF) concentrations was studied in female Swiss-Webster mice. For this purpose, newborn female pups were treated with thyroxine (T4, 0.4 microgram/g body weight/day) from birth through day 6, while their littermate pups were treated with similar volumes of vehicle. Animals were sacrificed on days 7, 15, 21, 31 and 71. Somatic growth (body weight and nose to rump length), serum T4 and T3 concentrations, and SMG and serum-NGF concentrations were measured. The data indicate that neonatal hyperthyroidism a) causes inhibition of somatic growth; b) induces alterations in normal ontogenic patterns of serum T4 and T3; c) impairs the developmental rise in SMG-NGF concentration and d) transiently increases serum-NGF levels.
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