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Systemic estradiol administration to ovariectomized rats facilitates thermoregulatory behavior in a cold environment.
Brain Research 2017 September 2
Rats place their tails underneath their bodies in the cold (tail-hiding behavior), which is a behavioral indicator of thermoregulation. The aim of the present study was to elucidate the effect of estradiol (E2 ) on tail-hiding behavior and neural activity assessed by immunohistochemistry. Ovariectomized rats were implanted with a silastic tube with or without E2 underneath the dorsal skin (E2 (-) and E2 (+) groups), and exposed to 27°C, 16°C, and 10°C for 2h with continuous body temperature (Tb ), tail skin temperature (Ttail ), and behavioral measurements. cFos immunoreactive (cFos-IR) cells in the insula, secondary somatosensory cortex, medial preoptic nucleus, parastrial nucleus, amygdala, and lateral parabrachial nucleus were counted. Tb and Ttail were not different between the E2 (-) and E2 (+) groups. At 16°C, the duration and the onset of tail-hiding behavior in the E2 (+) group were greater than that in the E2 (-) group. The number of cFos-IR cells in the insula of the E2 (-) group was greater than that of the E2 (+) group in rats kept at 16°C. E2 might modulate tail-hiding behavior of female rats at 16°C, and the insula may be involved in the response.
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