Interaction between Leptin and Growth Hormone (GH)/IGF-I Axis

In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was dec...

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Published inENDOCRINE JOURNAL Vol. 46; no. Suppl; pp. S17 - S24
Main Authors ISOZAKI, OSAMU, TSUSHIMA, TOSHIO, DEMURA, HIROSHI, MIYAKAWA, MEGUMI, SEKI, HITOSHI
Format Journal Article
LanguageEnglish
Published Japan The Japan Endocrine Society 1999
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Online AccessGet full text
ISSN0918-8959
1348-4540
DOI10.1507/endocrj.46.Suppl_S17

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Abstract In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5IU/kg). IGF-I treatment (200μg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.
AbstractList In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0 IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5 IU/kg). IGF-I treatment (200 μg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.
In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0 IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5 IU/kg). IGF-I treatment (200 microg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0 IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5 IU/kg). IGF-I treatment (200 microg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.
In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5IU/kg). IGF-I treatment (200μg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.
In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0 IU/kg) reduced % body fat after 7 days. The leptin mRNA level in subcutaneous fat tissue was not changed but that in epididymal fat tissue was decreased by an even lower dose of GH (1.5 IU/kg). IGF-I treatment (200 microg/kg/day) did not change the % body fat or leptin mRNA level. These observations suggest that GH directly interacts with visceral fat and reduces fat mass and leptin expression. We also measured serum leptin levels in patients. The levels in patients with acromegaly were significantly lower than those in normal subjects with the same amount of body fat, but serum IGF-I and urinary C peptide excretion rates were higher in the acromegalic. These observations also suggests that GH directly interacts with adipose tissue and reduces leptin expression. Next we investigated the direct action of leptin on GH release from the pituitary. Leptin pretreatment of pituitary cells in culture or rats in a fasted or fed condition did not change GRH induced GH secretion. As indicated also by other recent studies, leptin may increase GRH or decrease somatostatin secretion by the hypothalamus. Thus GH interacts with fat tissues and leptin may be a good marker of the interaction.
Author ISOZAKI, OSAMU
TSUSHIMA, TOSHIO
SEKI, HITOSHI
MIYAKAWA, MEGUMI
DEMURA, HIROSHI
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References 8) Isozaki O, Tsushima T, Nozoe Y, Demura H, Seki H (1988) Effects of growth hormone on leptin gene expression in rats. Endocr J 45 Suppl: S117-119.
9) Murakami T, Shima K (1995) Cloning of rat obese cDNA and its expression in obese rats. Biochem Biophys Res Commun 209: 944-952.
15) al-Shoumer KA, Anyaoku V, Richmond W, Shonston DG (1997) Elevated leptin concentrations in growth hormone-deficient hypopituitary adults. Clin Endocrinol 47: 153-159.
1) Thorner MO, Vance ML, Horvath E, Kovacs K (1992) The anterior pituitary. In: Wilson JD, Foster DW (eds) Williams Textbook of endocrinology. 8th ed, W.B. Saunders Company, Philadelphia, 221-310.
2) Goodman HM (1968) Multiple effects of growth hormone on lipolysis. Endocrinology 83: 300-308.
4) Deoer H, Block G-J, Van der Veen EA (1995) Clinical aspects of growth hormone deficiency in adults. Endocr Rev 16: 63-86.
6) Ahmad I, Steggles AW, Carrillo AJ, Finkelstein JA (1990) Developmental changes in levels of growth hormone mRNA in Zucker rats. J Cell Biochem 43:59-66.
7) Chua SCN Jr. Chung WK, Wu-Peng XS, Zhang Y, Liu SM, Tartaglia L, Leibel RL (1996) Phenotypes of mouse diabetes and rat fatty due to mutations in the OB (leptin) receptor. Science 271: 994-996.
11) Boni-Schnetzler M, Gosteli-Peter MA, Moritz W, Froesch ER, Zapf J (1996) Reduced ob mRNA in hypophysectomized rats is not restored by growth hormone (GH), but further suppressed by xogenously administered insulin-like growth factor (IGF)-I. Biochem Biophys Res Commun 225: 296-301.
14) Saladin R, De Vos P, Guerre-Millo M, Leturque A, Girard J, Staels B, Auwerx J (1995) Transient increase in obese gene expression after food intake or insulin administration. Nature 377: 527-529.
19) Gill MS, Toogood AA, O'Neill PA, Adams JE, Thorner MO, Shalet SM, Clayton PE (1997) Relationship between growth hormone (GH) status, serum leptin and body composition in healthy and GH deficient elderly subjects. Clin Endocrinol (Oxf) 47: 161-167.
17) Florkowski CM, Collier GR, Zimmet PZ, Livesey JH, Espiner EA, Donald RA (1996) Low-dose growth hormone replacement lowers plasma leptin and fat stores without affecting body mass index in adults with growth hormone deficiency. Clin Endocrinol (Oxf) 45: 769-773.
5) Zhang Y, Proenca R, Maffei M, Barone M, Leopold L, Friedman JM (1994) Positional cloning of the mouse obese gene and its human homologue. Nature 372: 425-432.
18) Limone P, Oleandri SE, Ajmone Catt P, Grottoli S, Frangioni C, Avogadri E, Perrin M, Valetto MR, Maccario M (1997) The inhibitory effect of glucose on growth hormone secretion is lost in obesity but not in hypertension. J Endocrinol Invest 20: 616-620.
16) Nystrom F, Ekman B, Osterlund M, Lindstrom T, Ohman KP, Arngvist HJ (1997) Serum leptin concentrations in a normal population and in GH deficiency: Negative correlation with testosterone in men and effects of GH treatment. Clin Endocrinol (Oxf) 47: 191-198.
20) Carro E, Senaris R, Considine RV, Casanueva FF, Dieguez C (1997) Regulation of in vivo growth hormone secretion by leptin. Endocrinology 138: 2203-2206.
10) Makino R, Sekiya T, Hayashi K (1990) Evaluation of quantitative detection of mRNA by the reverse transcription-polymerase chain reaction. Technique 2: 295-301.
12) De Vos P, Paladin R, Auwerx J, Staels B (1995) Induction of ob gene expression by corticosteroids is accompanied by body weight loss and reduced food intake. J Biol Chem 270: 15958-15961.
13) Buchard C, Despres JP, Mauriege P (1993) Genetic and nongenetic determinants of regional fat distribution. Endocr Rev 14: 72-93.
3) Fain JN, Kovacev VP, Scow RO (1965) Effect of growth hormone and dexamethasone on lipolysis and metabolism in isolated fat cells of the rat. J Biol Chem 240: 3522-3529.
References_xml – reference: 18) Limone P, Oleandri SE, Ajmone Catt P, Grottoli S, Frangioni C, Avogadri E, Perrin M, Valetto MR, Maccario M (1997) The inhibitory effect of glucose on growth hormone secretion is lost in obesity but not in hypertension. J Endocrinol Invest 20: 616-620.
– reference: 3) Fain JN, Kovacev VP, Scow RO (1965) Effect of growth hormone and dexamethasone on lipolysis and metabolism in isolated fat cells of the rat. J Biol Chem 240: 3522-3529.
– reference: 9) Murakami T, Shima K (1995) Cloning of rat obese cDNA and its expression in obese rats. Biochem Biophys Res Commun 209: 944-952.
– reference: 17) Florkowski CM, Collier GR, Zimmet PZ, Livesey JH, Espiner EA, Donald RA (1996) Low-dose growth hormone replacement lowers plasma leptin and fat stores without affecting body mass index in adults with growth hormone deficiency. Clin Endocrinol (Oxf) 45: 769-773.
– reference: 7) Chua SCN Jr. Chung WK, Wu-Peng XS, Zhang Y, Liu SM, Tartaglia L, Leibel RL (1996) Phenotypes of mouse diabetes and rat fatty due to mutations in the OB (leptin) receptor. Science 271: 994-996.
– reference: 8) Isozaki O, Tsushima T, Nozoe Y, Demura H, Seki H (1988) Effects of growth hormone on leptin gene expression in rats. Endocr J 45 Suppl: S117-119.
– reference: 2) Goodman HM (1968) Multiple effects of growth hormone on lipolysis. Endocrinology 83: 300-308.
– reference: 11) Boni-Schnetzler M, Gosteli-Peter MA, Moritz W, Froesch ER, Zapf J (1996) Reduced ob mRNA in hypophysectomized rats is not restored by growth hormone (GH), but further suppressed by xogenously administered insulin-like growth factor (IGF)-I. Biochem Biophys Res Commun 225: 296-301.
– reference: 6) Ahmad I, Steggles AW, Carrillo AJ, Finkelstein JA (1990) Developmental changes in levels of growth hormone mRNA in Zucker rats. J Cell Biochem 43:59-66.
– reference: 14) Saladin R, De Vos P, Guerre-Millo M, Leturque A, Girard J, Staels B, Auwerx J (1995) Transient increase in obese gene expression after food intake or insulin administration. Nature 377: 527-529.
– reference: 5) Zhang Y, Proenca R, Maffei M, Barone M, Leopold L, Friedman JM (1994) Positional cloning of the mouse obese gene and its human homologue. Nature 372: 425-432.
– reference: 19) Gill MS, Toogood AA, O'Neill PA, Adams JE, Thorner MO, Shalet SM, Clayton PE (1997) Relationship between growth hormone (GH) status, serum leptin and body composition in healthy and GH deficient elderly subjects. Clin Endocrinol (Oxf) 47: 161-167.
– reference: 13) Buchard C, Despres JP, Mauriege P (1993) Genetic and nongenetic determinants of regional fat distribution. Endocr Rev 14: 72-93.
– reference: 15) al-Shoumer KA, Anyaoku V, Richmond W, Shonston DG (1997) Elevated leptin concentrations in growth hormone-deficient hypopituitary adults. Clin Endocrinol 47: 153-159.
– reference: 1) Thorner MO, Vance ML, Horvath E, Kovacs K (1992) The anterior pituitary. In: Wilson JD, Foster DW (eds) Williams Textbook of endocrinology. 8th ed, W.B. Saunders Company, Philadelphia, 221-310.
– reference: 16) Nystrom F, Ekman B, Osterlund M, Lindstrom T, Ohman KP, Arngvist HJ (1997) Serum leptin concentrations in a normal population and in GH deficiency: Negative correlation with testosterone in men and effects of GH treatment. Clin Endocrinol (Oxf) 47: 191-198.
– reference: 4) Deoer H, Block G-J, Van der Veen EA (1995) Clinical aspects of growth hormone deficiency in adults. Endocr Rev 16: 63-86.
– reference: 20) Carro E, Senaris R, Considine RV, Casanueva FF, Dieguez C (1997) Regulation of in vivo growth hormone secretion by leptin. Endocrinology 138: 2203-2206.
– reference: 10) Makino R, Sekiya T, Hayashi K (1990) Evaluation of quantitative detection of mRNA by the reverse transcription-polymerase chain reaction. Technique 2: 295-301.
– reference: 12) De Vos P, Paladin R, Auwerx J, Staels B (1995) Induction of ob gene expression by corticosteroids is accompanied by body weight loss and reduced food intake. J Biol Chem 270: 15958-15961.
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Snippet In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose...
In order to identify the mutual interaction between GH and leptin, we studied the effect of GH on fatty Zucker rats. GH administration at a high dose (5.0...
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SubjectTerms Acromegaly - blood
Acromegaly - urine
Adipose tissue
Adipose Tissue - drug effects
Adipose Tissue - metabolism
Animals
Body Composition
C-Peptide - urine
Female
Gene Expression Regulation
Growth Hormone - metabolism
Growth Hormone - pharmacology
Humans
Insulin-Like Growth Factor I - metabolism
Insulin-Like Growth Factor I - pharmacology
Insulin-Like Growth Factor I - urine
Leptin
Leptin - biosynthesis
Leptin - genetics
Leptin - metabolism
Male
ob gene
Obese
Obesity - metabolism
Rats
Rats, Wistar
Rats, Zucker
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - biosynthesis
RNA, Messenger - genetics
Title Interaction between Leptin and Growth Hormone (GH)/IGF-I Axis
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