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  • Title: Diurnal variations in the catecholamine content in rat tissues. Effects of exogenous noradrenaline.
    Author: Davidović V, Petrović VM.
    Journal: Arch Int Physiol Biochim; 1981 Dec; 89(5):457-60. PubMed ID: 6176202.
    Abstract:
    Endogenous noradrenaline (NA) content of the interscapular brown adipose tissue (IBAT), and of the hypothalamus, as well as adrenaline (A) and NA content of the adrenals were measured in the morning and in the evening in rats treated with saline (controls) or with NA (1.6 mg kg-1 pp). NA content in IBAT and in hypothalamus of control animals varies diurnally. NA content in IBAT was significantly higher in the evening than in the morning. In the hypothalamus, these variations were different of those found in the IBAT. Exogenous NA applied both in the morning and in the evening increases significantly NA content in IBAT both in the morning and in the evening, but more in the evening. Unlike IBAT, NA content of the hypothalamus after NA administration does not change essentially. In the adrenal gland of control rats, A content only is changed during the day, being markedly lower in the evening. After NA injection both A and NA are not changed significantly.
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