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題 名 | Neuroendocrine Regulation of Growth Hormone Sercrtion and Growth in Fish=魚類生長激素分泌及生長之神經內分泌調節 |
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作 者 | 彭純; | 書刊名 | 動物研究學刊 |
卷 期 | 36:2 1997.04[民86.04] |
頁 次 | 頁79-89 |
分類號 | 388.5 |
關鍵詞 | 魚類; 生長激素; 進食; 神經冴; 單胺; Fish; Growth hormone; Food intake; Neuropeptide; Monoamine; |
語 文 | 英文(English) |
中文摘要 | 魚類的生長是由腦神經內分泌系統一生長激素(GH) 一類胰島生長因子(IGF) 所 控制的。腦中多種刺激因子和抑制因子能作用於腦下垂體生長激素分泌細胞,而調節生長激 素的分泌,而且這些因子對生長激素分泌的調節作用能隨生殖季節而變化。 促生長激素釋放抑制因子 (SRIF) 是最主要的抑制因子。它不但能抑制生長激的基礎分泌, 而且還能阻斷所有釋放因子對生長激素分泌的促進作用。 去甲腎上腺素 (NE) 和 5 羥色胺 (5-HT) 對生長激素的分泌也起抑制作用。 有幾種神經內分泌因子,包括生長激素釋放因子 (GRF),多巴胺 (DA),促性腺激素釋放因子 (GnRH),神經�� Y (NPY), 促甲狀腺素釋放因 子 (TRH),胰�t分泌素 (CCK), bo mbesin (BBS) 和 ac-tivin,都已證明能夠促進生長激 素分泌。GRF 和 DA 在性腺退化期促進生長激素分泌的作用最強,而 GnRF,NPY 和 TRH 的 作用則於性腺成熟期最為明顯。性腺類固醇,尤其是雌二醇,能調節生長激素分泌細胞對這 些神經內分泌因子的反應。正是這種性激素和神經內分泌因子之間的相互作用導致了魚類生 長激素分泌的季節性調控。 腦中調節食物攝入量和生長激素分泌的系統是相關連的。在金魚中,血液生長激素的含量通 常在進食後有一個短暫的上升,接著下降到低於進食前水準。 BBC 和 CCK 能同時控制食慾 和進食後生長激素的分泌。實驗證明在魚類中,生長激素的分泌和食物攝取都受到多重神經 內分泌因子的調節,目前面臨的難題是如何去瞭解這兩種控制系統之間的相互關係。 |
英文摘要 | Chun Peng and Richard E. Peter (1997) Neuroendocrine regulation of gro wth hormone secretion and growth in fish. Zoological Studies 36(2): 79-89. Growth in fish is regulated in large part by the brain neruo-endocrine-growth hormone (GH)-insulin-like growth factor axis. GH secretion is in turn regulated by multiple factors from the brain, with both stimulatory and inhibitory neurohormones acting on the somato-trophs seasonally. Somatostatin is the primary inhibitor of basal and stimulated GH secretion. Norepinephrine and serotonin also have inhibitory actions on GH relase. On the other hand, GH secretion is stimulated by a number of neuroendocrine factors, including growth hormone-releasing factor (GRF) , dopamine (DA) , gonado-tropin-releasing hormone (GnRH) , neuropeptide Y (NPY) , thyrotropin-releasing hormone (TRH), Cholecystokinin (CCK), bombesin (BBS), and activin. While GRF and DA are more potent in stimulating GH secretion in sexually regressed fish, GnRH, NPY, and TRH have greater stimulatory effects on GH secretion in sexually mature (i.e., prespawning) fish. Sex steroids, in parti cular estradiol, influence the responsiveness of the somatotrophs to neuroendocrine factors. The integrated actionof sex steroids and neuroendocrine factors provides a basis for the seasonal regulation of growth hormone secretion. The brain peptide systems regulating food intake are linked to the brain neuroendocrine regulation of GH secretion. Following a meal, goldfish characteristically show a short-term increase in serum GH con-centrations, and then a decrease in serum GH concentrations to below premeal levels. BBS and CCK are involved in satiation and the changes in GH secretion following a meal in goldfish. Both the neuroendocrine regulation of GH secretion and the brain regulation of feeding are multifactorial. Understanding the inte-gration of these systems presents a major challenge. |
本系統中英文摘要資訊取自各篇刊載內容。