JaLCDOI 10.18926/AMO/32165
フルテキストURL fulltext.pdf
著者 Ogasa, Takashi| Hashimoto, Kozo| Ota, Zensuke|
抄録 <p>We examined the effect of food deprivation for three days on hypothalamic arginine vasopressin (AVP) mRNA in rats. Simultaneously the effect of water deprivation for the same period was examined as a model of dehydration. Levels of AVP mRNA in the supraoptic nucleus (SON) and the paraventricular nucleus (PVN) were determined by semiquantitative in situ hybridization histochemistry. Water deprivation increased AVP mRNA in both nuclei as previously reported. In contrast, food deprivation decreased AVP mRNA in these nuclei. The changes in AVP mRNA levels in the PVN were observed in the magnocellular subdivision of the nucleus. Plasma levels of ACTH and corticosterone were greatly increased in both treated groups of rats. Plasma AVP and osmolality levels were significantly elevated in water-deprived rats but not in food-deprived rats. These observations indicated that both food deprivation and water deprivation stimulated the pituitary-adrenal axis and that a reduction in AVP mRNA levels in food-deprived rats was caused by food deprivation but not by glucocorticoid feedback suppression nor by altered plasma osmolality.</p>
キーワード food deprivation arginine vasopressin mRNA supraoptic nucleus paraventricular uncleus hypothalamo-pituitary-adrenal system in situ hybridization histochemistry
Amo Type Article
発行日 1991-08
出版物タイトル Acta Medica Okayama
45巻
4号
出版者 Okayama University Medical School
開始ページ 283
終了ページ 293
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 1962535
Web of Science KeyUT A1991GD78000011
JaLCDOI 10.18926/AMO/30454
フルテキストURL fulltext.pdf
著者 Hashimoto, Kozo| Makino, Shinya| Hirasawa, Ryuto| Takao, Toshihiro| Kageyama, Jingo| Ogasa, Takashi| Ota, Zensuke|
抄録 <p>We examined 8 normal subjects and 16 patients with non-functioning pituitary tumors with a combined anterior pituitary test to evaluate the clinical usefulness of the test. Diagnoses included 9 of chromophobe adenoma, 3 of craniopharyngioma, 2 of Rathke's cleft cyst, and 1 each of intrasellar cyst and tuberculum sella meningioma. All subjects received hypothalamic releasing hormones: 1 micrograms/kg corticotropin releasing hormone (CRH), 1 micrograms/kg growth hormone releasing hormone (GRH), 500 micrograms thyrotropin-releasing hormone (TRH), 100 micrograms luteinizing hormone releasing hormone (LH-RH), and a relatively small dose (5 mU/kg) of lysine vasopressin (LVP). In the normal subjects, the addition of LVP potentiated the secretion of adenocorticotropic hormone (ACTH) induced by CRH, but had no significant effect on the secretion of other anterior pituitary hormones. In the combined test with 5 releasing hormones, the plasma ACTH and cortisol responses were not impaired in the majority of the patients before pituitary surgery. Serum thyroid-stimulating hormone (TSH), prolactin (PRL) and follicle-stimulating hormone (FSH) responses were not impaired in 82%, 70% and 67% of the patients, respectively, while the serum LH and GH responses were impaired in 67% and 73% of the patients, respectively. Following pituitary surgery, responses of these hormones to combined testing were similarly impaired in more than 75% of the patients. These results indicate that plasma ACTH, cortisol and serum TSH responses are fairly good before pituitary surgery but are impaired significantly after surgery. No subjects experienced any serious adverse effects related to the testing. These results suggest that combined testing with hypothalamic hormones is a convenient and useful method for evaluating pituitary function.</p>
キーワード anterior pituitary function test pituitary tumors corticotropin releasing hormone growth hormone releasing hormone luteinzing hormone releasing hormone thyrotropin releasing hormone
Amo Type Article
発行日 1990-06
出版物タイトル Acta Medica Okayama
44巻
3号
出版者 Okayama University Medical School
開始ページ 141
終了ページ 147
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 2200236
Web of Science KeyUT A1990DM18300005
JaLCDOI 10.18926/AMO/30451
フルテキストURL fulltext.pdf
著者 Suemaru, Shuso| Hashimoto, Kozo| Ogasa, Takashi| Takao, Toshihiro| Ota, Zensuke| Hirakawa, Makoto| Kawata, Mitsuhiro|
抄録 <p>The effects of salt loading and adrenalectomy on arginine vasopressin (AVP) mRNA levels in the paraventricular nucleus (PVN) and the supraoptic nucleus (SON) of the hypothalamus were studied by semiquantitative in situ hybridization histochemistry, using a synthetic oligonucleotide probe and a computer-assisted image analysis system. Salt loading (2% NaCl) for 7 days produced marked increases in AVP mRNA levels in the magnocellular neurons of the PVN, SON, and accessory nuclei. Adrenalectomy caused an increase in AVP mRNA expression in the magnocellular part of the PVN and the expansion of hybridization signals into its medial parvocellular region, where the cell bodies of corticotropin-releasing hormone (CRH) neurons are located. No apparent alteration of AVP mRNA levels was observed in the SON following adrenalectomy. These results indicate that hyperosmotic stimulation and the loss of circulating glucocorticoids had differential effects on AVP gene expression in the PVN and SON, and that the magnocellular PVN and SON neurons responded in different manners to the loss of feedback signals.</p>
キーワード in situ hybridization arginine vasopressin mRNA hypothalamus osmotic stimulation adrenalectomy
Amo Type Article
発行日 1990-10
出版物タイトル Acta Medica Okayama
44巻
5号
出版者 Okayama University Medical School
開始ページ 233
終了ページ 241
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 2260495
Web of Science KeyUT A1990EG00700001