Hypothalamic gonadotropin-inhibitory hormone precursor mRNA is increased during depressed food intake in heat-exposed chicks

Vishwajit S. Chowdhury, Shozo Tomonaga, Shotaro Nishimura, Shoji Tabata, John F. Cockrem, Kazuyoshi Tsutsui, Mitsuhiro Furuse

    Research output: Contribution to journalArticle

    35 Citations (Scopus)

    Abstract

    The regulation of food intake in chickens (. Gallus gallus domesticus) represents a complex homeostatic mechanism involving multiple levels of control, and regulation during high ambient temperatures (HT) is poorly understood. In this study, we examined hypothalamic mRNA expression of gonadotropin-inhibitory hormone (GnIH) to understand the effect of HT on an orexigenic neuropeptide. We examined the effects of HT (35. °C ambient temperature for 1, 24 or 48. h) on 14-day old chicks. HT significantly increased rectal temperature and suppressed food intake, and also influenced plasma metabolites. The expression of GnIH precursor mRNA in the diencephalon was significantly increased in chicks at 24-and 48. h of HT when food intake was suppressed significantly, whilst no change was observed for GnIH precursor mRNA and food intake at 1. h of HT. . In situ hybridization and immunocytochemistry further revealed the cellular localization of chicken GnIH precursor mRNA and its peptide in the paraventricular nucleus (PVN) in the chick hypothalamus. We examined plasma metabolites in chicks exposed to HT for 1 or 48. h and found that triacylglycerol concentration was significantly higher in HT than control chicks at 1. h. Total protein, uric acid and calcium were significantly lower in HT chicks than control chicks at 48. h. These results indicate that not only a reduction in food intake and alteration in plasma metabolites but also the PVN-specific expression of GnIH, an orexigenic agent, may be induced by HT. The reduced food intake at the same time as GnIH expression was increased during HT suggests that HT-induced GnIH expression may oppose HT-induced feeding suppression, rather than promote it. We suggest that the increased GnIH expression could be a consequence of the reduced food intake, and would not be a direct response to HT.

    Original languageEnglish
    Pages (from-to)227-233
    Number of pages7
    JournalComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
    Volume162
    Issue number3
    DOIs
    Publication statusPublished - 2012 Jul

    Fingerprint

    RNA Precursors
    Gonadotropins
    Eating
    Hot Temperature
    Hormones
    Temperature
    Metabolites
    Chickens
    Paraventricular Hypothalamic Nucleus
    Plasmas
    Appetite Regulation
    Diencephalon
    Uric Acid
    Neuropeptides
    Temperature control
    Hypothalamus
    In Situ Hybridization

    Keywords

    • Chick
    • Food intake
    • Gonadotropin-inhibitory hormone
    • High ambient temperature
    • Plasma metabolites

    ASJC Scopus subject areas

    • Biochemistry
    • Molecular Biology
    • Physiology

    Cite this

    Hypothalamic gonadotropin-inhibitory hormone precursor mRNA is increased during depressed food intake in heat-exposed chicks. / Chowdhury, Vishwajit S.; Tomonaga, Shozo; Nishimura, Shotaro; Tabata, Shoji; Cockrem, John F.; Tsutsui, Kazuyoshi; Furuse, Mitsuhiro.

    In: Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology, Vol. 162, No. 3, 07.2012, p. 227-233.

    Research output: Contribution to journalArticle

    Chowdhury, Vishwajit S. ; Tomonaga, Shozo ; Nishimura, Shotaro ; Tabata, Shoji ; Cockrem, John F. ; Tsutsui, Kazuyoshi ; Furuse, Mitsuhiro. / Hypothalamic gonadotropin-inhibitory hormone precursor mRNA is increased during depressed food intake in heat-exposed chicks. In: Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology. 2012 ; Vol. 162, No. 3. pp. 227-233.
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    AU - Nishimura, Shotaro

    AU - Tabata, Shoji

    AU - Cockrem, John F.

    AU - Tsutsui, Kazuyoshi

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