Tail position affects the body temperature of rats during cold exposure in a low-energy state
Tóm tắt
Rats place their tails underneath their body trunks when cold (tail-hiding behavior). The aim of the present study was to determine whether this behavior is necessary to maintain body temperature. Male Wistar rats were divided into ‘fed’ and ‘42-h fasting’ groups. A one-piece tail holder (8.4 cm in length) that prevented the tail-hiding behavior or a three-piece tail holder (2.8 cm in length) that allowed for the tail-hiding behavior was attached to the tails of the rats. The rats were exposed to 27°C for 180 min or to 20°C for 90 min followed by 15°C for 90 min with continuous body temperature and oxygen consumption measurements. Body temperature decreased by −1.0 ± 0.1°C at 15°C only in the rats that prevented tail-hiding behavior of the 42-h fasting group, and oxygen consumption increased at 15°C in all animals. Oxygen consumption was not different between the rats that prevented tail-hiding behavior and the rats that allowed the behavior in the fed and 42-h fasting groups under ambient conditions. These results show that the tail-hiding behavior is involved in thermoregulation in the cold in fasting rats.
Tài liệu tham khảo
Adair ER (1971) Displacements of rectal temperature modify behavioral thermoregulation. Physiol Behav 7:21–26
Almeida MC, Steiner AA, Branco LG, Romanovsky AA (2006) Cold-seeking behavior as a thermoregulatory strategy in systemic inflammation. Eur J Neurosci 23:3359–3367
Aschoff J (1981) Minireview thermal conductance in mammals and birds: its dependence on body size and circadian phase. Comp Biochem Physiol 69A:611–619
Cannon B, Nedergaard J (2004) Brown adipose tissue: function and physiological significance. Physiol Rev 84:277–359
Chen XM, Hosono T, Mizuno A, Yoda T, Yoshida K, Aoyagi Y, Kanosue K (1998) New apparatus for studying behavioral thermoregulation in rats. Physiol Behav 64:419–424
Gordon CJ (1993) Temperature regulation in laboratory rodents. The Press Syndicate of University of Cambridge, Cambridge
Gordon CJ (1990) Thermal biology of the laboratory rat. Physiol Behav 47:963–991
Griggio MA, Richard D, Leblanc J (1992) Effects of fasting and food restriction on sympathetic activity in brown adipose tissue in mice. J Comp Physiol B 162:602–606
Hayashi M, Nagasaka T (1983) Suppression of norepinephrine-induced thermogenesis in brown adipose tissue by fasting. Am J Physiol 245:E582–E586
Hori K, Ishigaki T, Koyama K, Kaya M, Tsujita J, Hori S (1998) Adaptive changes in the thermogenesis of rats by cold acclimation and deacclimation. Jpn J Physiol 48:505–508
Hori T, Kiyohara T, Oomura Y, Nishino H, Aou S, Fujita I (1987) Activity of thermosensitive neurons of monkey preoptic hypothalamus during thermoregulatory operant behavior. Brain Res Bull 18:649–655
Kilgour RD, Williams PA (1996) Effects of diabetes and food deprivation on shivering activity during progressive hypothermia in the rat. Comp Biochem Physiol A Physiol 114:159–165
KLEIBER M (1947) Body size and metabolic rate. Physiol Rev 27:511–541
Kotze J, Bennett NC, Scantlebury M (2008) The energetics of huddling in two species of mole-rat (Rodentia: Bathyergidae). Physiol Behav 93:215–221
Koban M, Swinson KL (2005) Chronic REM-sleep deprivation of rats elevates metabolic rate and increases UCP1 gene expression in brown adipose tissue. Am J Physiol Endocrinol Metab 289:E68–E74
Lackey WW, Broome LA, Goetting JA, Vaughan DA (1970) Diurnal patterns of rats determined by calorimetry under controlled conditions. J Appl Physiol 29:824–829
Nagashima K, Nakai S, Matsue K, Konishi M, Tanaka M, Kanosue K (2003) Effects of fasting on thermoregulatory processes and the daily oscillations in rats. Am J Physiol Regul Integr Comp Physiol 284:R1486–R1493
Refinetti R, Horvath SM (1989) Thermopreferendum of the rat: inter- and intra-subject variabilities. Behav Neural Biol 52:87–94
Romanovsky AA, Ivanov AI, Shimansky YP (2002) Selected contribution: ambient temperature for experiments in rats: a new method for determining the zone of thermal neutrality. J Appl Physiol 92:2667–2679
Sakurada S, Shido O, Sugimoto N, Hiratsuka Y, Yoda T, Kanosue K (2000) Autonomic and behavioural thermoregulation in starved rats. J Physiol 526(Pt 2):417–424
Stricker EM, Hainsworth FR (1971) Evaporative cooling in the rat: interaction with heat loss from the tail. Q J Exp Physiol Cogn Med Sci 56:231–241
Uchida Y, Tokizawa K, Nakamura M, Mori H, Nagashima K (2010) Estrogen in the medial preoptic nucleus of the hypothalamus modulates cold responses in female rats. Brain Res 1339:49–59
Yoda T, Crawshaw LI, Yoshida K, Su L, Hosono T, Shido O, Sakurada S, Fukuda Y, Kanosue K (2000) Effects of food deprivation on daily changes in body temperature and behavioral thermoregulation in rats. Am J Physiol Regul Integr Comp Physiol 278:R134–R139