Immunohistochemical demonstration of urotensins I and II in the caudal neurosecretory system of the Japanese charr, Salvelinus leucomaenis, retained in sea water.
スポンサーリンク
概要
- 論文の詳細を見る
This paper is concerned with part of the role and function of the caudal neurosecretory system of the charr, <I>Salvelinus leucomaenis</I>, studied by immunohistochemistry. In order to elucidate the different histologic changes, we examined the immunoreactivities of urotenisn I (UI) and urotensin II (UII) in 3 experimental groups: the feral (river) fish, the fresh-water aquarium-, and sea water aquarium-retained fish. Coexistence of UI and UII was demonstrated in most of the smaller and larger neurons distributed in and near the urophyseal system of all 3 groups. However, some of the larger neurons were immunoreactive only to a single hormone, UI or UII. Merely a few neurons indicated no reactivity for either UI or UII. No such clearcut differences were encountered immunohistochemically in the 3 groups. Neuronal and urophysial immunoreactivity to UI of feral and fresh-water-retained fish was slightly stronger than that of sea water-retained fish. Moreover, in sea water-retained fish, the intensity of immunoreactivity for UI was variable, and the number of neurons positive for UII only was somewhat larger than that in feral and fresh-water-retained fish. A series of UII-positive cerebrospinal fluid (CSF)-contacting neurons were seen in the ependymal and subependymal layers ventral to the central canal of the spinal cord in every group.These CSF-contacting neurons might constitute another neurosecretory system aside from the ordinary caudal neurosecretory system equipped with urophysis. In contrast to the hypothalamohypophysial neurosecretory system, the caudal neurosecretory system did not show any significant changes among the 3 groups. This suggests that urotensins I and II have no essential role in osmoregulation of the charr.
- 日本魚類学会の論文
日本魚類学会 | 論文
- スジシマドジョウ小型種と大型種の急減
- スジシマドジョウ種群における地方的分化〔英文〕
- マアジの卵発生と初期発育
- 摂餌または飢餓状態のブリ仔魚における消化器官の組織学的構造と機能について
- ニジマス(Oncorhynchus mykiss)の胆汁カルシウム濃度に及ぼすスタニウス小体抽出物および17β-エストラジオールの影響