A note on the caudal neurosecretory system and seasonal changes observed in the urophysis of Rita rita (Bleeker)

1975 ◽  
Vol 53 (3) ◽  
pp. 357-360 ◽  
Author(s):  
Sureshwar Sharma ◽  
Ashok Sharma
Keyword(s):  
Seasonal Changes ◽  
Neurosecretory System ◽  
Caudal Neurosecretory System ◽  
Blood Capillaries ◽  
Herring Bodies

The general histomorphology of the caudal neurosecretory system of Rita rita has been studied in samples taken each month of the year. During the breeding months (August and September) the stored material disappears from a considerable number of Herring bodies, leaving lacunae in their place. Simultaneously blood capillaries increase in volume. In the light of these findings, a correlation has been established between this system and reproduction.

Fish caudal neurosecretory system: A model for the study of neuroendocrine secretion

2007 ◽  
Vol 153 (1-3) ◽  
pp. 243-250 ◽  
Author(s):  
Catherine R. McCrohan ◽  
Weiqun Lu ◽  
Matthew J. Brierley ◽  
Louise Dow ◽  
Richard J. Balment
Keyword(s):  
Neurosecretory System ◽  
Caudal Neurosecretory System ◽  
System A

scholarly journals Urotensin receptor (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database

2019 ◽  
Vol 2019 (4) ◽  
Author(s):  
Anthony P. Davenport ◽  
Stephen A. Douglas ◽  
Alain Fournier ◽  
Adel Giaid ◽  
Henry Krum ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Neurosecretory System ◽  
Urotensin Ii ◽  
High Sequence Identity ◽  
Caudal Neurosecretory System ◽  
Amino Acid Peptide ◽  
Related Peptide ◽  
Human Sequence ◽  
Mature Mouse

The urotensin-II (U-II) receptor (UT, nomenclature as agreed by the NC-IUPHAR Subcommittee on the Urotensin receptor [26, 36, 89]) is activated by the endogenous dodecapeptide urotensin-II, originally isolated from the urophysis, the endocrine organ of the caudal neurosecretory system of teleost fish [7, 88]. Several structural forms of U-II exist in fish and amphibians. The goby orthologue was used to identify U-II as the cognate ligand for the predicted receptor encoded by the rat gene gpr14 [20, 62, 68, 70]. Human urotensin-II, an 11-amino-acid peptide [20], retains the cyclohexapeptide sequence of goby U-II that is thought to be important in ligand binding [53, 11]. This sequence is also conserved in the deduced amino-acid sequence of rat urotensin-II (14 amino-acids) and mouse urotensin-II (14 amino-acids), although the N-terminal is more divergent from the human sequence [19]. A second endogenous ligand for the UT has been discovered in rat [83]. This is the urotensin II-related peptide, an octapeptide that is derived from a different gene, but shares the C-terminal sequence (CFWKYCV) common to U-II from other species. Identical sequences to rat urotensin II-related peptide are predicted for the mature mouse and human peptides [32]. UT exhibits relatively high sequence identity with somatostatin, opioid and galanin receptors [89].

Neurohormones from Fish Tails: The Caudal Neurosecretory System

1985 ◽  
pp. 533-552 ◽  
Author(s):  
HOWARD A. BERN ◽  
DAVID PEARSON ◽  
BRETT A. LARSON ◽  
RICHARD S. NISHIOKA
Keyword(s):  
Neurosecretory System ◽  
Caudal Neurosecretory System

scholarly journals UII and UT in grouper: cloning and effects on the transcription of hormones related to growth control

2013 ◽  
Vol 220 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Caiyun Sun ◽  
Da Duan ◽  
Bo Li ◽  
Chaobin Qin ◽  
Jirong Jia ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Cyclic Peptide ◽  
Growth Control ◽  
Hek293 Cells ◽  
Neurosecretory System ◽  
Functional Study ◽  
Urotensin Ii ◽  
Caudal Neurosecretory System ◽  
Paracrine Growth Factor ◽  
Motor Effects

Urotensin II (UII) is a cyclic peptide that was originally extracted from the caudal neurosecretory system (CNSS) of fish. UII is well known to exhibit cardiovascular, ventilatory, and motor effects in vertebrates. Studies have reported that UII exerts mitogenic effects and can act as an autocrine/paracrine growth factor in mammals. However, similar information in fish is limited. In this study, the full-length cDNAs of UII and its receptor (UT) were cloned and characterized in the orange-spotted grouper. UII and UT were expressed ubiquitously in various tissues in grouper, and particularly high levels were observed in the CNSS, CNS, and ovary. A functional study showed that UT was coupled with intracellular Ca2+ mobilization in HEK293 cells. Studies carried out using i.p. injections of UII in grouper showed the following: i) in the hypothalamus, UII can significantly stimulate the mRNA expression of ghrh and simultaneously inhibit the mRNA expression of somatostatin 1 (ss1) and ss2 3 h after injection; ii) in the pituitary, UII also significantly induced the mRNA expression of gh 6 and 12 h after injection; and iii) in the liver, the mRNA expression levels of ghr1/ghr2 and igf1/igf2 were markedly increased 12 and 3 h after the i.p. injection of UII respectively. These results collectively indicate that the UII/UT system may play a role in the promotion of the growth of the orange-spotted grouper.

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