Summary
The response of caudal neurosecretory cells in Salvelinus fontinalis to exposure to media in which one ion (Na, K, Mg, Ca and Cl) was either selectively enriched or depleted was evaluated by morphometric criteria. Morphological changes indicating stimulation of synthetic activity were observed: exposure to sea water with low potassium concentration was the most efficacious in inducing the increase in the average diameter of caudal cells and the number of nucleoli for both cells with lobed and with nonlobed nuclei. The proportion of cells with lobed nuclei was also increased. To a lesser degree and in decreasing order, experimental milieu with modified magnesium contents, either fresh water enriched in this ion or seawater depleted of the same ion, and fresh water enriched in calcium also resulted in significant increases in cell diameter and the number of nucleoli.
The two cytological cell types, viz cells with non-lobed nuclei or cells with lobed nuclei, are interpreted as being linked to different levels of neurosecretory activity.
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References
Bennett MVL, Fox S (1962) Electrophysiology of caudal neurosecretory cells in the skate and fluke. Gen Comp Endocrinol 2:77–95
Berlind A, Lacanilao F, Bern H (1972) Teleost caudal neurosecretory system: Effects of osmotic stress on urophysial proteins and active factors. Comp Biochem Physiol 42A:345–352
Bern HA, Nishioka RS (1979) The caudal neurosecretory system and osmoregulation. Gunma Sympo Endocrinol 16:9–17
Chan DKO (1975) Cardiovascular and renal effects of urotensins I and II in the eel, Anguilla rostrata. Gen Comp Endocrinol 27:52–61
Chevalier G (1976) Ultrastructural changes in the caudal neurosecretory cells of the trout Salvelinus fontinalis in relation to external salinity. Gen Comp Endocrinol 29:441–454
Chevalier G (1978) In vivo incorporation of (3H) leucine and (3H) tyrosine by caudal neurosecretory cells of the trout Salvelinus fontinalis in relation to osmotic manipulations. A radioautographic study. Gen Comp Endocrinol 36:223–228
Eddy FB (1975) The effect of calcium on gill potentials and on sodium and chloride fluxes in the goldfish Carassius auratus. J Comp Physiol 96:131–142
Enami M (1956) Studies on neurosecretion. VIII. Changes in the caudal neurosecretory system of the loach (Misgurnus anguilli caudatus) in response to osmotic stimuli. Proc Jpn Acad 32:759–764
Fridberg G, Bern HA, Nishioka RS (1966) The caudal neurosecretory system of the isopondylous teleost, Albula vulpes, from different habitats. Gen Comp Endocrinol 6:195–212
Fryer JN, Woo NYS, Gunther RL, Bern HA (1978) Effect of urophysial homogenates on plasma ion levels in Gillichthys mirabilis (Teleostei: Gobiidae). Gen Comp Endocrinol 35:238–244
Gauthier L, Audet C, Chevalier G (1983) Régulations aminergique et cholinergique du système caudal neurosecréteur de l'omble de fontaine, Salvelinus fontinalis, en relation avec l'osmo-ionorégulation. Can J Zool 61:2856–2867
Hirano T (1979) Effects of carp urophysial extract on renal function in the eel, Anguilla japonica. Gunma Sympo Endocrinol 16:59–68
Ichikawa T (1979) Release of urotensin I by neurotransmitters and ultrastructural changes in the carp urophysis in vitro. Gunma Symp Endocrinol 16:87–96
Kobayashi Y, Ichikawa T, Kobayashi H (1980) Innervation of the caudal neurosecretory system of the teleost. Gunma Symp Endocrinol 16:81–86
Lederis K (1977) Chemical properties and the physiological and pharmacological actions of urophysial peptides. Am Zool 17:823–32
Lederis K (1979) Teleost urophysis. I. Bioassay of an active urophysial principle on the isolated urinary bladder of the rainbow trout, Salmo gairdnerii. Gen Comp Endocrinol 14:417–426
Loretz CA, Bern HA (1981) Stimulation of sodium transport across the teleost urinary bladder by Urotensin II. Gen Comp Endocrinol 43:325–330
Loretz CA, Bern HA, Kevin Foskett J, Manoya JR (1981) The caudal neurosecretory system and osmoregulation in fish; In: Farner D, Lederis K (eds) Molecules, cells, systems. Plenum Press, New York, pp 319–328
Luft JH (1961) Improvements in epoxy resin embedding methods. J Biophys Biochem Cytol 9:408–419
Maetz J (1969) Seawater teleosts: Evidence for a sodium-potassium exchange in the branchial sodium excepting pump. Science 166:613–615
Maetz J, Bourget and Lahlouh B (1964) Urophyse et osmorégulation chez Carassius auratus. Gen Comp Endocrinol 4:401–414
Marshall WS, Bern HA (1979) Teleostan urophysis: Urotensin II and ion transport across the isolated skin of a marine teleost. Science 204:519–521
Motais R (1967) Les mécanismes d'échanges ioniques branchiaux chez les téléostéens. Ann Inst Ocean (Paris) 15:1–84
Nishioka RS, Bern HA, Gunther RL (1980) Hormone-carrier-neurosecretory granule association in the urophysis of the goby Gillichthys mirabilis. Acta Zool 61:29–38
Schade JP (1964) On the volume and surface area of spinal neurons. Prog Brain Res 11:261–308
Siew YE (1965) The endocrine control of adult reproductive diapause in the chrysomelid beetle Galeruca tanaceti (L.) II. J Insect Physiol 11:463–479
Takasugi N, Bern HA (1962) Experimental studies on the caudal neurosecretory system of Tilapia mossambica. Comp Biochem Physiol 6:289–303
Wendelaar Bonga SE (1971) Osmotically induced changes in the activity of neurosecretory cells located in the pleural ganglia of the freshwater snail Lymnaea stagnalis (L.), studied by quantitative electron microscopy. Neth J Zool 21:127–158
Woo NYS, Tong CM, Chan ELP (1980) Effects of urophysial extracts on plasma electrolyte and metabolite levels in Ophiocephalus maculatus. Gen Comp Endocrinol 41:458–466
Yagi K, Bern HA (1965) Electrophysiologic analysis of the response of the caudal neurosecretory system of Tilapia mossambica to osmotic manipulations. Gen Comp Endocrinol 5:509–529
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Sacks, S., Chevalier, G. Response of caudal neurosecretory cells of Salvelinus fontinalis to variations in the ionic composition of the environment. Cell Tissue Res. 238, 87–93 (1984). https://doi.org/10.1007/BF00215148
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DOI: https://doi.org/10.1007/BF00215148