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  • 1
    Electronic Resource
    Electronic Resource
    Biochemistry and physiology of a family of eel natriuretic peptides (1993)
    Springer
    Fish physiology and biochemistry 11 (1993), S. 183-188 
    Details
    ISSN: 1573-5168
    Keywords: atrial natriuretic peptide ; brain natriuretic peptide ; C-type natriuretic peptide ; ventricular natriuretic peptide ; Anguilla japonica ; amino acid sequence ; hydromineral balance ; water intake ; intestinal absorption ; renal excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Trois peptides natriurétiques présentant des structures similaires ont été isolés chez l'anguille et leurs séquences en acides aminés a été déterminées; le peptide atrial natriurétique (ANP) dans l'atria, le peptide ventriculaire natriurétique (VNP) dans les ventricules et le peptide natriurétique de type C dans le cerveau. Ces trois hormones sont présents dans le sang d'anguille et leur niveau plasmatique decroit invariablement quand les anguilles sont transférées d'eau douce en eau de mer. L'ANP et le VNP d'anguille inhibent l'action de boire chez les anguilles d'eau douce et d'eau de mer. L'ANP d'anguille inhibe l'absorption d'eau et de Na+ par l'intestin d'anguille en eau de mer. Ces effets de l'ANP sont 2 à 3 fois plus grands que ceux observés avec d'autres hormones qui sont connues pour avoir des effets similaires. L'ANP et le VNP d'anguille induisent l'antidiurèse mais pas l'antinatriurèse chez les anguilles d'eau douce. L'ANP d'anguille augmente chez ce poisson les niveaux de cortisol plasmatique en eau de mer mais pas en eau douce. L'effet antidiurétique et la stimulation de la sécrétion de cortisol chez l'anguille sont contraire aux effets de l'ANP observés chez les mammifères. Ces résultats suggèrent que l'ANP joue un role complexe dans l'osmorégulation de l'anguille.
    Notes: Abstract Three natriuretic peptides with similar structures were isolated from eels and their amino acid sequences determined; atrial natriuretic peptide (ANP) from atria, ventricular natriuretic peptide (VNP) from ventricles, and C-type natriuretic peptide (CNP) from brains. All three hormones were circulating in eel blood, and their plasma levels invariably decreased when eels were transferred from fresh water (FW) to seawater (SW). Eel ANP and VNP inhibited drinking in FW and SW eels. Eel ANP inhibited water and Na+ absorption by the intestine of SW eels. The potency of these ANP effects was 2–3 orders greater than those of other hormones which are known to have similar effects. Eel ANP and VNP induced antidiuresis but not antinatriuresis in FW eels. Eel ANP increased plasma cortisol level in SW eels but not in FW eels. The antidiuretic effect and the stimulation of cortisol secretion in eels are opposite to the ANP effects reported in mammals. These data suggest that ANP plays a complex role in the eel osmoregulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004565
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  • 2
    Electronic Resource
    Electronic Resource
    Identification and partial characterization of immunoreactive and bioactive atrial natriuretic peptide from eel heart (1990)
    Springer
    Journal of comparative physiology 160 (1990), S. 119-126 
    Details
    ISSN: 1432-136X
    Keywords: Atrial natriuretic peptide ; Immunocytochemistry ; Radioimmunoassay ; Hypotension ; Anguilla japonica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cardiocytes positive for human atrial natriurectic peptide (hANP) were identified histochemically in the eel atrium, but they were not found in the ventricule. Secretory granules were frequently observed in atrial cardiocytes by electron microscopy, but the number of such granules was quite small in the ventricle. Immunogold cytochemistry revealed that immunoreactive ANP (IR-ANP) in atrial cardiocytes was localized in these granules. In spite of poor immunostaining of the eel ventricle, an acid extract of the ventricle contained 25±4 ng·g tissue-1 (n=9) of IR-ANP when the level of IR-ANP was measured by radioimmunoassay (RIA) for hANP. This level was one eight of that measured in atrial extracts (203±13 ng·g tissue-1, n=9). Plasma contained 116.7±18.6 pg·ml-1 (n=9) of IR-ANP. An extract of eel hearts decreased arterial pressure in eels and quail as did hANP. The level of ANP in the extract, as measured by an eel vasodepressor bioassay, was much greater than that measured by RIA for hANP. The immunoreactive and bioactive ANP in the heart extract are identical since the vasodepressor activity disappeared after IR-ANP was absorbed by excess antibodies raised against hANP. Chromatography on Sephadex G-75 generated a major peak of IR-ANP at a position that corresponded to a molecular weight of 14 kD and minor peaks at 3–7 kD from both plasma and heart extract. Reverse phase HPLC of plasma and heart extract generated several peaks of IR-ANP at positions more hydrophilic than those of mammalian ANPs. These results show that eel hearts contain immunoreactive and bioactive ANPs which are distinctly different from hANP. These ANPs are synthesized both in the atrium and in the ventricle, and they are secreted into the circulation mostly in the larger molecular form. The atrial ANP may be stored in the granules and secreted upon exposure of eels to certain stimuli, but the ventricular ANP may be secreted constitutively into the circulation without prior storage in the granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300943
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  • 3
    Electronic Resource
    Electronic Resource
    Water intake induced by water deprivation in the quail,Coturnix coturnix japonica (1988)
    Springer
    Journal of comparative physiology 158 (1988), S. 519-525 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mechanisms inducing drinking after water deprivation, and mechanisms terminating drinking after rehydration, were investigated in the quail,Coturnix coturnix japonica. 1. Water intake was induced after 4 h of water deprivation, and the amount of water drunk increased in proportion to the period of water deprivation. Drinking occurred immediately after deprived birds were given access to water, and continued for periods proportional to the period of water deprivation. 2. Plasma angiotensin II concentration increased, as did plasma osmolality and Na+ concentration, and blood volume decreased after water deprivation. The increase in plasma angiotensin II concentration and decrease in blood volume occurred soon after the start of water deprivation, whereas plasma osmolality and Na+ concentration did not increase until at least 4 h after the start of water deprivation. 3. These results indicate that extracellular dehydration and angiotensin II are responsible for the significant drinking that follows 4 h of water deprivation, and that cellular dehydration is also involved in the stimulation of drinking that occurs after longer periods of water deprivation. 4. Plasma osmolality and Na+ concentration in birds deprived of water for 48 h quickly returned to normal levels after the birds were allowed access to water. Plasma angiotensin II levels and blood volume also approached the values measured prior to water deprivation. However, the rate and degree of restoration of normal values were reduced, and normal values were not restored even after 1.5 h of rehydration when drinking terminated. 5. The amount of water drunk over the course of 1.5 h by birds deprived of water for 48 h was much greater than the amount required to restore the changes in plasma osmolality and blood volume to normal, but neither excessive dilution of plasma nor abnormally high blood volumes were observed during drinking or 0.5 h after drinking terminated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692559
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of eel atrial natriuretic peptide on NaCl and water transport across the intestine of the seawater eel (1992)
    Springer
    Journal of comparative physiology 162 (1992), S. 436-439 
    Details
    ISSN: 1432-136X
    Keywords: Eel atrial natriuretic peptide ; NaCl absorption ; Water absorption ; Eel intestine ; Structure-activity relationship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Eel atrial natriuretic peptide inhibited the serosa-negative transepithelial potential difference and short-circuit current, accompanied by a decrease in NaCl and water absorption across the seawater eel intestine. Similar effects were obtained after treatment with N-terminally truncated eel atrial natriuretic peptide (5–27), indicating that N-terminal amino acids are not essential for the action of eel atrial natriuretic peptide. Although mammalian atrial natriuretic peptides also inhibited the short-circuit current, a 100-fold higher concentration was reuired to obtain the same effect as with eel atrial natriuretic peptide, indicating that eel atrial natriuretic peptide is 100 times as potent in eel intestine as the mammalian atrial natriuretic peptides. Similarly, in mammalian atrial natriuretic peptide, the four N-terminal amino acids had no significant effects. However, when the C-terminal tyrosine was removed, the potency of rat atrial natriuretic peptide was lowered. Compared with the effects of acetylcholine, serotonin and histamine, eel atrial natriuretic peptide was the most potent inhibitor, with 100% inhibition at 10-7 M; 50% inhibition was obtained at 10-2 M in acetylcholine, and 30% inhibition in serotonin (10-5 M) and histamine (10-3 M). These inhibitory effects of eel atrial natriuretic peptide were not diminished even in the presence of tetradoxin, and were mimicked by 8-bromoguanosine 3′,5′-cyclic monophosphate. Based on these results, structure-activity relationships of eel atrial natriuretic peptide and a possible mechanism of action of eel atrial natriuretic peptide are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258966
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  • 5
    Electronic Resource
    Electronic Resource
    Parenchymal fine structure of the subfornical organ in the Japanese quail, Coturnix coturnix japonica (1978)
    Springer
    Cell & tissue research 191 (1978), S. 405-419 
    Details
    ISSN: 1432-0878
    Keywords: Subfornical organ ; Japanese quail, Coturnix coturnix japonica ; Monoaminergic innervation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The parenchyma of the subfornical organ (SFO) of the Japanese quail was studied by light and electron microscopy. The SFO consists of ependymal, intermediate, and basal (perimeningeal) layers. In the intermediate layer, neurons, glial cells, and their processes are found. Axons containing dense core granules approximately 80 nm in diameter are numerous, some of which make synaptic contact with the neuronal perikarya or dendrites. Synaptic vesicles in some axons contain a dense dot in the interior after treatment with 5-hydroxydopamine. The activity of the SFO, which is probably concerned with elicitation of drinking by angiotensin II, may be regulated at least partly by afferent monoaminergic axons. Capillaries with a non-fenestrated endothelium are occasionally found in the parenchyma. The basal layer is occupied by glial processes abutting on the digitating layer of perivascular connective tissue of meningeal vessels. The endothelium of these vessels is occasionally fenestrated. Trypan blue injected systemically accumulated in the SFO, but not in the deeper areas of the brain. The absence of a blood-brain barrier is suggested in the SFO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219805
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  • 6
    Electronic Resource
    Electronic Resource
    Surface fine structure of the subfornical organ in the Japanese quail, Coturnix coturnix japonica (1978)
    Springer
    Cell & tissue research 191 (1978), S. 389-404 
    Details
    ISSN: 1432-0878
    Keywords: Subfornical organ ; Japanese quail, Coturnix coturnix japonica ; Ultrastructure ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The surface ultrastructure of the subfornical organ (SFO) was investigated in the Japanese quail. The SFO consists of a body and a stalk. The body of the SFO can be divided into rostral and caudal parts. On the rostral part, each ependymal cell possesses a short central solitary cilium; clustered cilia are also occasionally seen. Microvilli are abundant. On the caudal part, cells with a solitary cilium are fewer in number, and clustered cilia are rarely found. Microvilli are not as abundant as on the rostral part. In addition, large bulbous protrusions, tufts of small protrusions, deep funnel-shaped hollows, small pinocytotic invaginations and possible cerebrospinal fluid-contacting axons are sporadically observed on the surface of various regions of the body. Each ependymal cell of the stalk has a wide apical surface. A central solitary cilium, microvilli and other structures are observed more rarely on the stalk than on the body, while clustered cilia are not seen on the stalk. These structures are compared with those of the mammalian SFO and further discussed in relation to the possible dipsogenic receptor function for angiotensin II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219804
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  • 7
    Electronic Resource
    Electronic Resource
    The role of the subfornical organ in drinking induced by angiotensin in the Japanese quail, Coturnix coturnix japonica (1977)
    Springer
    Cell & tissue research 185 (1977), S. 175-181 
    Details
    ISSN: 1432-0878
    Keywords: Subfornical organ ; Angiotensin ; Drinking behavior ; Preoptic area ; Japanese quail
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Synthetic 5-valine angiotensin II (AII) induced copious drinking when applied directly to the subfornical organ (SFO) in the Japanese quail. Reliable response was obtained with as little as 1 ng of AII. The amount of water intake increased dose-dependently from 5 ng to 1 ng. A latent period of 73.0 ± 11.0 seconds at 100 ng was noted. The electrical destruction of the SFO significantly reduced the amount of water intake induced by both intravenous and intracranial AII injections. The decrease was proportional to the extent of the SFO lesion. It is conceivable, therefore, that the SFO plays an important role in elicitation of drinking by AII in birds as suggested in mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220662
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  • 8
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    Parenchymal fine structure of the subfornical organ in the Japanese quail, Coturnix coturnix japonica (1978)
    Springer
    Details
    Publication Date: 1978-08-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 9
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    Surface fine structure of the subfornical organ in the Japanese quail, Coturnix coturnix japonica (1978)
    Springer
    Details
    Publication Date: 1978-08-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 10
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    Distribution and co-localization of diversified natriuretic peptides in the eel heart (2018)
    Springer
    Details
    Publication Date: 2018-04-25
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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