tetraiodothyronine

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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2014/09/24 20:40:38」(JST)

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英文文献

  • Expression of the mammary gland-specific tammar wallaby early lactation protein gene is maintained in vitro in the absence of prolactin.
  • Pharo EA.Author information Department of Zoology, The University of Melbourne, Melbourne, Victoria 3010, Australia; Cooperative Research Centre for Innovative Dairy Products, Australia; Victorian Institute of Animal Science, Department of Primary Industries, Attwood, Victoria 3049, Australia. Electronic address: epharo@unimelb.edu.au.AbstractMarsupial ELP (early lactation protein) and its eutherian orthologue, CTI (colostrum trypsin inhibitor) are expressed in the mammary gland only for the first 100 days postpartum (Phase 2A) in the tammar wallaby and during the bovine and canine colostrogenesis period 24-36h postpartum respectively. The factors which regulate temporal ELP and CTI expression are unknown. A tammar mammary gland explant culture model was used to investigate ELP gene regulation during pregnancy and early- and mid-lactation (Phase 1, 2A and 2B respectively). Tammar ELP expression could only be manipulated in explants in vitro if the gene was already expressed in vivo. ELP expression was maximal in Phase 1 explants treated with lactogenic hormones (insulin, hydrocortisone and prolactin), but unlike LGB (β-lactoglobulin), ELP expression was maintained in insulin or insulin and hydrocortisone over a 12-day culture period. In contrast, ELP was down-regulated when cultured without hormones. ELP could not be induced in explants cultured from mid-lactation which suggested that transcriptional repressors may prevent ELP expression during this period.
  • Molecular and cellular endocrinology.Mol Cell Endocrinol.2014 Feb 15;382(2):871-80. doi: 10.1016/j.mce.2013.10.030. Epub 2013 Nov 1.
  • Marsupial ELP (early lactation protein) and its eutherian orthologue, CTI (colostrum trypsin inhibitor) are expressed in the mammary gland only for the first 100 days postpartum (Phase 2A) in the tammar wallaby and during the bovine and canine colostrogenesis period 24-36h postpartum respectively. T
  • PMID 24189438
  • The Prevalence of Goiter and Hypothyroidism among School Children 6 Years after Introduction of a Mandatory Salt Iodination Program in a Severely Iodine-Deficient Area of the West Black Sea Region of Turkey.
  • Uzun H1, Gozkaya S, Yesildal N, Okur M, Arslanoglu I, Kocabay K, Senses DA.Author information 1Department of Pediatrics, Duzce University School of Medicine, Duzce, Turkey.AbstractThe objective of the current study was to determine the prevalence and the degree of iodine deficiency after mandatory salt iodization in Yığılca's school-aged children. A total of 806 school children aged 6-19 years were evaluated. The prevalence of goiter in children aged 6-12 and 13-19 years was 20.3 and 23.8%, respectively. The prevalence of hypothyroidism in children aged 6-12 and 13-19 years was 10.4 and 18.9%, respectively. The median serum free tetraiodothyronine (fT4) levels in children aged 6-12 and 13-19-years were 1.16 ng/dL and 0.91 ng/dL, respectively. The median urinary iodine concentration levels in children aged 6-12 and 13-19 years were 83 µg/l and 78 µg/l, respectively. The frequency of autoimmune thyroid disease was 2.1% in Yığılca's SAC. Goiter and iodine deficiency problems remain in rural areas of the West Black Sea Region of Turkey.
  • Journal of tropical pediatrics.J Trop Pediatr.2014 Feb 10. [Epub ahead of print]
  • The objective of the current study was to determine the prevalence and the degree of iodine deficiency after mandatory salt iodization in Yığılca's school-aged children. A total of 806 school children aged 6-19 years were evaluated. The prevalence of goiter in children aged 6-12 and 13-19 years w
  • PMID 24519672
  • Hormonal imbalance and disturbances in carbohydrate metabolism associated with chronic feeding of high sucrose low magnesium diet in weanling male wistar rats.
  • Garg M1, Mehra P, Bansal DD.Author information 1Department of Biochemistry, Panjab University, Chandigarh, 160014, India.AbstractThis study was designed to determine chronic effect of high sucrose low magnesium (HSLM) diet in weanling rats on plasma thyroid profile, catecholamines and activities of key hepatic glycolytic, and gluconeogenic enzymes. Compared to control diet fed group, significantly elevated levels of plasma triiodothyronine, tetraiodothyronine, catecholamines (epinephrine, norepinephrine, and dopamine) and activity of hepatic glycolytic (hexokinase and glucokinase), and gluconeogenic (glucose-6-phosphatase) enzymes were observed in high sucrose and low magnesium fed groups. However, HSLM diet had an additive effect on all these three parameters. The study thus, assumes significance as it shows that hormonal imbalance and disorders in carbohydrate metabolism at an early stage of development can be due to dietary modification or due to deficiency of key element magnesium.
  • Molecular and cellular biochemistry.Mol Cell Biochem.2014 Jan 5. [Epub ahead of print]
  • This study was designed to determine chronic effect of high sucrose low magnesium (HSLM) diet in weanling rats on plasma thyroid profile, catecholamines and activities of key hepatic glycolytic, and gluconeogenic enzymes. Compared to control diet fed group, significantly elevated levels of plasma tr
  • PMID 24390085

和文文献

関連リンク

a thyroid hormone that contains iodine and is a derivative of the amino acid tyrosine, occurring naturally as l-thyroxine; its chemical name is tetraiodothyronine. It is formed and stored in the thyroid follicles as thyroglobulin and released from the ...

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★リンクテーブル★
リンク元甲状腺ホルモン」「サイロキシン

甲状腺ホルモン」

  [★]

thyroid hormone, thyroid hormones
甲状腺サイログロブリンカルシトニン甲状腺ホルモン製剤
胎児の発育・新生児の生理と適応


  • SP.915-

種類

分類

性状

  • 疎水性アミノ酸

産生組織

標的組織

受容体

  • 核内甲状腺受容体(甲状腺ホルモン受容体ファミリー)
ステロイドレセプタースーパーファミリーに属する → 核内受容体スーパーファミリー

作用

代謝系別

  • 1. 熱産生
  • 脳、脾臓、睾丸をのぞくすべての組織で酸素消費を高める ← 甲状腺クリーゼによる発熱の原因
  • 2. 自律神経系
  • カテコラミンの作用を増強する
  • 心筋細胞のカテコールアミン受容体を増加 ←証明されていない?
  • 3. 内分泌
→甲状腺ホルモンの投与によりコルチゾールが減少し副腎クリーゼを誘発
  • 4. 呼吸器系
  • 5. 造血器系
  • エリスロポエチン産生促進 → 赤血球増加
  • ヘモグロビンからの酸素解離を促進 → 末梢組織での酸素利用↑
  • 6. 骨格筋系作用
  • 骨代謝回転を高め、骨形成・骨吸収を促進 (閉経後女性で甲状腺ホルモン多 → 骨塩量減少 → 骨粗鬆症
  • グレーブス病では筋肉蛋白の代謝亢進、筋肉量の減少、筋力低下、筋脱力、四肢麻痺
  • 7. 糖代謝
  • 糖代謝の亢進
  • 8. 脂質代謝
  • 肝臓におけるコレステロール産生を促進
  • 肝臓のトリグリセリドリパーゼ活性を亢進し、コレステロールの代謝を促進
コレステロールが減少 ← 総じて分解系の法が作用が強い
  • 9. その他

薬理学的作用 (SPC.321)

  • 成長と発育
全ての生体の活動に関わる-(不足)→成長停止、身体的・精神的発育停止
  • 熱産生と体温調整
組織の酸素消費を高め、基礎代謝を亢進させる。Na+,K+-ATApaseの活性刺激や、核内クロマチンに作用してDNA転写を促進する作用による
  • 代謝亢進作用
上記の通り
  • TSH分泌抑制
ネガティブフィードバック

分泌の調節

  • 分泌の制御系
視床下部--(甲状腺刺激ホルモン放出ホルモン)-→下垂体前葉--(甲状腺刺激ホルモン)-→甲状腺濾胞細胞-→T3, T4-→T3, T4下垂体前葉・視床下部に作用し甲状腺刺激ホルモンの分泌を抑制

分子機構

臨床関連

過多

欠乏

  • 甲状腺機能検査値の異常を来す病態。ほとんどの場合TSHは正常
  • free T3↓、rT3↑(重症ではT4↓、TSH
  • 低栄養、外傷、感染症、手術、腎不全、肝不全、心不全、悪性腫瘍
  • エネルギー消費を減らすための適応かもしれない
以上2007後期生理学授業プリント内分泌(3)

生合成 (SP.916)

サイロキシン」

  [★]

thyroxine, T4, thyroxin (Z)
テトラヨードサイロニン tetraiodothyronine、(薬品名としてはこちらが使われている)チロキシン
甲状腺ホルモンL-thyroxinelevothyroxinelevothyroxine sodium
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