Abstract
In conscious Pekin ducks adapted to hypertonic saline (1.9%) as drinking water, steady state secretion of the salt glands was established by continuous intravenous salt loading and the effects of hypothalamic thermal stimulation on salt gland activity and on the plasma concentrations of arginine vasotocin (AVT) and angiotensin II (AII) were observed. Hypothalamic cooling depressed salt gland secretion and the plasma level of AVT. Hypothalamic warming caused transient activation and subsequent inhibition of salt gland secretion without consistent changes of the plasma levels of AVT and AII. Whole body cooling by heat extraction with a colonic thermode produced moderate inhibition of salt gland activity, without changes in plasma AVT and AII, which may be explained by peripheral vasoconstriction. The results are consistent with the view that hypothalamic osmoregulation is under an influence of local temperature by combined osmo/thermo-responsiveness of hypothalamic neurons and temperature dependence of signal transmission in hypothalamic neural integration of osmoregulation.
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References
Baker MA, Doris PA (1982) Effect of dehydration on hypothalamic control of evaporation in the cat. J Physiol (Lond) 322:457–468
Bouverot P, Hildwein G, LeGoff D (1974) Evaporative water loss, respiratory pattern, gas exchange and acid-base balance during thermal panting in Pekin ducks exposed to moderate heat. Respir Physiol 21:255–269
Butler DG (1984) Endocrine control of the nasal salt gland. J Exp Zool 232:725–736
Doris PA, Baker MA (1981) Effect of dehydration on thermoregulation in cats exposed to high ambient temperatures. J Appl Physiol 51:46–54
Forsling ML, Ingram DL, Stanier MW (1976) Effects of various ambient temperatures and of heating and cooling the hypothalamus and cervical spinal cord on antidiuretic hormone secretion and urinary osmolality in pigs. J Physiol (Lond) 257:673–686
Gauer OH, Henry JP (1976) Neurohormonal control of plasma volume. In: Guyton AC, Cowley AW (eds) Int Rev Physiol, Cardiovascular Physiology II, vol 9. University Park Press, Baltimore, pp 145–290
Gray DA, Simon E (1983) Mammalian and avian antidiuretic hormone: studies related to possible species variations in osmoregulatory systems. J Comp Physiol 151:241–246
Gray DA, Simon E (1985) Control of plasma angiotensin II in a bird with salt glands (Anas platyrhynchos). Gen Comp Endocrinol 60:1–13
Gray DA, Hammel HT, Simon E (1986) Osmoregulatory effects of angiotensin II in a bird with salt glands (Anas platyrhynchos). J Comp Physiol B 156:315–321
Hammel HT, Maggert JE, Simon E, Crawshaw L, Kaul R (1977) Thermo- and osmoregulatory responses induced by heating and cooling the rostral brainstem of the Adelie penguin. In: Llano GA (ed) Adaptations within antarctic ecosystems. Smithsonian Institution 1977, Washington DC, pp 489–500
Hammel HT, Simon-Oppermann Ch, Simon E (1980) Properties of body fluids influencing salt gland secretion in Pekin ducks. Am J Physiol 239:R489-R496
Hayward JN, Baker MA (1968) Diuretic and thermoregulatory responses to preoptic cooling in the monkey. Am J Physiol 214:843–850
Hori T, Nakashima T, Kiyohara T, Shibata M, Hori N (1980) Effect of calcium removal on thermosensitivity of preoptic neurons in hypothalamic slices. Neurosci Lett 20:171–175
Inenaga K, Osaka T, Yamashita H (1984) Thermosensitivity of neurons in the paraventricular nucleus of rats. J Physiol Soc Japan 46:391
Inomoto T, Mercer JB, Simon E (1982) Opposing effects of hypothalamic cooling on threshold and sensitivity of metabolic response to body cooling in rabbits. J Physiol (Lond) 322:139–150
Kaul R, Gerstberger R, Meyer JU, Simon E (1983) Salt gland blood flow in saltwater-adapted Pekin ducks: microsphere measurement of the proportionality to secretion rate and investigation of controlling mechanisms. J Comp Physiol 149:457–462
Matsumura K, Nakayama T, Tamaki Y (1985) Effects of preoptic and hypothalamic thermal stimulation on electrical activity of neurosecretory cells in the supraoptic nucleus. Brain Res 346:327–332
Nadel ER (1983) Factors affecting the regulation of body temperature during exercise. J Therm Biol 8:165–169
Nakashima T, Hori T, Kiyohara T, Shibata M (1985) Osmosensitivity of preoptic thermosensitive neurons in hypothalamic slices in vitro. Pflügers Arch 405:112–117
Nielsen B (1974) Effects of changes in plasma volume and osmolarity on thermoregulation during exercise. Acta Physiol Scand 90:725–730
Olsson K (1969) Studies on central regulation of secretion of antidiuretic hormone (ADH) in the goat. Acta Physiol Scand 77:465–474
Sadowski J, Kruk B, Chwalbinska-Moneta J (1977) Renal function changes during preoptic-anterior hypothalamic heating in the rabbit. Pflügers Arch 370:51–57
Simon E (1981) Effects of CNS temperature on generation and transmission of temperature signals in homeotherms. A common concept for mammalian and avian thermoregulation. Pflügers Arch 392:79–88
Simon E (1982) The osmoregulatory system of birds with salt glands. Comp Biochem Physiol 71A:547–556
Simon-Oppermann Ch, Hammel HT, Simon E (1979) Hypothalamic temperature and osmoregulation in the Pekin duck. Pflügers Arch 378:213–221
Simon-Oppermann Ch, Simon E, Deutsch H, Möhring J, Schoun J (1980) Serum arginine-vasotocin (AVT) and afferent and central control of osmoregulation in conscious Pekin ducks. Pflügers Arch 387:99–106
Simon-Oppermann Ch, Simon E, Jessen C, Hammel HT (1978) Hypothalamic thermosensitivity in conscious Pekin ducks. Am J Physiol 235:R130-R140
Szczepanska-Sadowska E (1974) Plasma ADH increase and thirst suppression elicited by preoptic heating in the dog. Am J Physiol 226:155–161
Turlejska-Stelmasiak E (1974) The influence of dehydration on heat dissipation mechanism in the rabbit. J Physiol (Paris) 68:5–15
Wilson JX, Pham DV, Tan-Wilson HI (1985) Angiotensin and converting enzyme regulate extrarenal salt excretion in ducks. Endocrinology 117:135–140
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Hori, T., Simon-Oppermann, C., Gray, D.A. et al. Thermally induced changes in neural and hormonal control of osmoregulation in a bird with salt glands (Anas platyrhynchos). Pflugers Arch. 407, 414–420 (1986). https://doi.org/10.1007/BF00652627
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DOI: https://doi.org/10.1007/BF00652627