Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice
We determined the consequences of the loss of D2 receptors (D2R) on the GH-IGF-I axis using mice deficient in functional dopamine D2 receptors by targeted mutagenesis (D2R-/-). Body weights were similar at birth, but somatic growth was less in male D2R-/- mice from 1-8 months of age and in D2R-/- fe...
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todo:paper_00137227_v143_n4_p1270_DiazTorga2023-10-03T14:11:15Z Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice Díaz-Torga, G. Feierstein, C. Libertun, C. Gelman, D. Kelly, M.A. Low, M.J. Rubinstein, M. Becú-Villalobos, D. 8 chloro 2,3,4,5 tetrahydro 3 methyl 5 phenyl 1h 3 benzazepin 7 ol hydrogen maleate DNA dopamine 1 receptor blocking agent dopamine 2 receptor dopamine 2 receptor blocking agent growth hormone growth hormone releasing factor prolactin somatomedin B somatomedin binding protein 3 somatomedin C sulpiride adolescent animal cell animal experiment animal model animal tissue article body growth body weight bone maturation controlled study dwarfism female femur food intake growth hormone blood level growth hormone release in vitro study knockout mouse liver weight male mouse newborn nonhuman priority journal radioimmunoassay white adipose tissue We determined the consequences of the loss of D2 receptors (D2R) on the GH-IGF-I axis using mice deficient in functional dopamine D2 receptors by targeted mutagenesis (D2R-/-). Body weights were similar at birth, but somatic growth was less in male D2R-/- mice from 1-8 months of age and in D2R-/- females during the first 2 months. The rate of skeletal maturation, as indexed by femur length, and the weight of the liver and white adipose tissue were decreased in knockout male mice even though food intake was not altered. The serum GH concentration was significantly decreased during the first 2 months in knockout female and male mice, and IGF-I and IGF-binding protein-3 levels were lower in knockout mice. PRL was significantly higher in knockout mice, and females attained higher levels than males. Pituitaries from adult knockout mice had impaired basal GH release and a lower response to GHRH in vitro. We propose that the D2R participates in GHRH/GH release in the first month of life. In accordance, the D2R antagonist sulpiride lowered GH levels in 1-month-old wild-type mice. Our results indicate that lack of D2R alters the GHRH-GH-IGF-I axis, and impairs body growth and the somatotrope population. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00137227_v143_n4_p1270_DiazTorga |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
8 chloro 2,3,4,5 tetrahydro 3 methyl 5 phenyl 1h 3 benzazepin 7 ol hydrogen maleate DNA dopamine 1 receptor blocking agent dopamine 2 receptor dopamine 2 receptor blocking agent growth hormone growth hormone releasing factor prolactin somatomedin B somatomedin binding protein 3 somatomedin C sulpiride adolescent animal cell animal experiment animal model animal tissue article body growth body weight bone maturation controlled study dwarfism female femur food intake growth hormone blood level growth hormone release in vitro study knockout mouse liver weight male mouse newborn nonhuman priority journal radioimmunoassay white adipose tissue |
| spellingShingle |
8 chloro 2,3,4,5 tetrahydro 3 methyl 5 phenyl 1h 3 benzazepin 7 ol hydrogen maleate DNA dopamine 1 receptor blocking agent dopamine 2 receptor dopamine 2 receptor blocking agent growth hormone growth hormone releasing factor prolactin somatomedin B somatomedin binding protein 3 somatomedin C sulpiride adolescent animal cell animal experiment animal model animal tissue article body growth body weight bone maturation controlled study dwarfism female femur food intake growth hormone blood level growth hormone release in vitro study knockout mouse liver weight male mouse newborn nonhuman priority journal radioimmunoassay white adipose tissue Díaz-Torga, G. Feierstein, C. Libertun, C. Gelman, D. Kelly, M.A. Low, M.J. Rubinstein, M. Becú-Villalobos, D. Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| topic_facet |
8 chloro 2,3,4,5 tetrahydro 3 methyl 5 phenyl 1h 3 benzazepin 7 ol hydrogen maleate DNA dopamine 1 receptor blocking agent dopamine 2 receptor dopamine 2 receptor blocking agent growth hormone growth hormone releasing factor prolactin somatomedin B somatomedin binding protein 3 somatomedin C sulpiride adolescent animal cell animal experiment animal model animal tissue article body growth body weight bone maturation controlled study dwarfism female femur food intake growth hormone blood level growth hormone release in vitro study knockout mouse liver weight male mouse newborn nonhuman priority journal radioimmunoassay white adipose tissue |
| description |
We determined the consequences of the loss of D2 receptors (D2R) on the GH-IGF-I axis using mice deficient in functional dopamine D2 receptors by targeted mutagenesis (D2R-/-). Body weights were similar at birth, but somatic growth was less in male D2R-/- mice from 1-8 months of age and in D2R-/- females during the first 2 months. The rate of skeletal maturation, as indexed by femur length, and the weight of the liver and white adipose tissue were decreased in knockout male mice even though food intake was not altered. The serum GH concentration was significantly decreased during the first 2 months in knockout female and male mice, and IGF-I and IGF-binding protein-3 levels were lower in knockout mice. PRL was significantly higher in knockout mice, and females attained higher levels than males. Pituitaries from adult knockout mice had impaired basal GH release and a lower response to GHRH in vitro. We propose that the D2R participates in GHRH/GH release in the first month of life. In accordance, the D2R antagonist sulpiride lowered GH levels in 1-month-old wild-type mice. Our results indicate that lack of D2R alters the GHRH-GH-IGF-I axis, and impairs body growth and the somatotrope population. |
| format |
JOUR |
| author |
Díaz-Torga, G. Feierstein, C. Libertun, C. Gelman, D. Kelly, M.A. Low, M.J. Rubinstein, M. Becú-Villalobos, D. |
| author_facet |
Díaz-Torga, G. Feierstein, C. Libertun, C. Gelman, D. Kelly, M.A. Low, M.J. Rubinstein, M. Becú-Villalobos, D. |
| author_sort |
Díaz-Torga, G. |
| title |
Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| title_short |
Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| title_full |
Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| title_fullStr |
Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| title_full_unstemmed |
Disruption of the D2 dopamine receptor alters GH and IGF-I secretion and causes dwarfism in male mice |
| title_sort |
disruption of the d2 dopamine receptor alters gh and igf-i secretion and causes dwarfism in male mice |
| url |
http://hdl.handle.net/20.500.12110/paper_00137227_v143_n4_p1270_DiazTorga |
| work_keys_str_mv |
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