1 Ocak 2013 Dergi makalesi Açık Erişim

Polat, H.; Mamuk, S.; Akarsu, E. S.

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    <subfield code="a">Hormonal synchronization of lipopolysaccharide-induced hypothermic response in rats</subfield>
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    <subfield code="p">JOURNAL OF ENDOCRINOLOGICAL INVESTIGATION</subfield>
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    <subfield code="a">Background: Recent experimental evidence suggests that lipopolysaccharide (LPS)-induced hypothermia is an adaptive thermoregulatory strategy against immunological challenge in rats. We hypothesized that the hormones which are predominantly responsible for energy homeostasis may have efferent signaling roles for development of the hypothermia. Aim: The aim of the study was to evaluate the changes of hypothalamic-pituitary-thyroid (HPT) and hypothalamic- pituitary-adrenal (HPA) axis hormones, leptin and erythropoietin at various phases of LPS-induced hypothermia such as the initial phase, nadir and the end of the response in blood sampled rats. Material and Methods: Body temperature of adult male albino Wistar rats was recorded by biotelemetry. E. coli O111:B4 LPS (250 mu g/kg, ip) was injected alone or with SC-560, a cyclooxygenase-1 selective inhibitor (1 mg/kg, sc). Results: Serum FT4 levels elevated at the initial phase, but FT3 levels decreased at nadir and remained low at the end of the response. Meanwhile, no change was observed in TSH levels. Serum adrenocorticotropic hormone (ACTH) levels reduced at the initial phase and serum corticosterone levels decreased at nadir without any change in serum corticotropin-releasing hormone (CRH) levels throughout the hypothermia. Serum leptin levels increased only at the end of the response. No change was observed in the levels of serum erythropoietin. SC-560 treatment abolished both LPS-induced hypothermia and respective hormonal changes. Conclusion: Data suggest that HPT axis hormones may contribute to development of LPS-induced hypothermia in rats. Data also support the view that leptin may have a role for the recovery of hypothermic response.</subfield>
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    <subfield code="u">Ankara Univ, Fac Med, Dept Med Pharmacol, TR-06100 Ankara, Turkey</subfield>
    <subfield code="a">Mamuk, S.</subfield>
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    <subfield code="u">Ankara Univ, Fac Med, Dept Med Pharmacol, TR-06100 Ankara, Turkey</subfield>
    <subfield code="a">Akarsu, E. S.</subfield>
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    <subfield code="u">Aksaray Univ, Dept Biol, Fac Art &amp; Sci, TR-68100 Aksaray, Turkey</subfield>
    <subfield code="a">Polat, H.</subfield>
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