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    Identification of a lipid-rich depot in the orbital cavity of the 13-lined ground squirrel

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    Name:
    MacCannell et al 2019 Squirrel ...
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    89.13Mb
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    Journal of Experimental Biology ...
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    Author
    MacCannell, Amanda DV
    Sinclair, Kevin J
    Tattersall, Glenn J
    McKenzie, Charles A
    Staples, James F
    Keyword
    MRI
    Hibernation
    Adipose
    Rete
    Lipid
    Orbit
    
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    URI
    http://hdl.handle.net/10464/14037
    Abstract
    We discovered a previously undescribed orbital lipid depot in the 13-lined ground squirrel during the first ever magnetic resonance image (MRI) of this common experimental model of mammalian hibernation. In animals housed at constant ambient temperatures (5ºC or 25ºC, 12h L:12h D photoperiod) the volume of this depot increased in the autumn and decreased in the spring, suggesting an endogenous circannual pattern. Water-fat MRI revealed that throughout the year this depot is composed of ~40% lipid, similar to brown adipose tissue (BAT). During arousal from torpor, thermal images showed higher surface temperatures near this depot before the rest of the head warmed, suggesting a thermoregulatory function. This depot, however, does not contain uncoupling protein 1, a BAT biomarker, or uncoupling protein 3. Histology shows blood vessels in close proximity to each other, suggesting it may serve as a vascular rete, perhaps to preferentially warm the eye and brain during arousals.
    ae974a485f413a2113503eed53cd6c53
    10.1242/jeb.195750
    Scopus Count
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    Biological Sciences

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