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Laursen 2015 Proc Natl Acad Sci USA

From Bioblast
Publications in the MiPMap
Laursen WJ, Mastrotto M, Pesta D, Funk OH, Goodman JB, Merriman DK, Ingolia N, Shulman GI, Bagriantsev SN, Gracheva EO (2015) Neuronal UCP1 expression suggests a mechanism for local thermogenesis during hibernation. Proc Natl Acad Sci USA 112:1607-12.

ยป PMID:25605929

Laursen WJ, Mastrotto M, Pesta D, Funk OH, Goodman JB, Merriman DK, Ingolia N, Shulman GI, Bagriantsev SN, Gracheva EO (2015) Proc Natl Acad Sci USA

Abstract: Hibernating mammals possess a unique ability to reduce their body temperature to ambient levels, which can be as low as -2.9 ยฐC, by active down-regulation of metabolism. Despite such a depressed physiologic phenotype, hibernators still maintain activity in their nervous systems, as evidenced by their continued sensitivity to auditory, tactile, and thermal stimulation. The molecular mechanisms that underlie this adaptation remain unknown. We report, using differential transcriptomics alongside immunohistologic and biochemical analyses, that neurons from thirteen-lined ground squirrels (Ictidomys tridecemlineatus) express mitochondrial uncoupling protein 1 (UCP1). The expression changes seasonally, with higher expression during hibernation compared with the summer active state. Functional and pharmacologic analyses show that squirrel UCP1 acts as the typical thermogenic protein in vitro. Accordingly, we found that mitochondria isolated from torpid squirrel brain show a high level of palmitate-induced uncoupling. Furthermore, torpid squirrels during the hibernation season keep their brain temperature significantly elevated above ambient temperature and that of the rest of the body, including brown adipose tissue. Together, our findings suggest that UCP1 contributes to local thermogenesis in the squirrel brain, and thus supports nervous tissue function at low body temperature during hibernation. โ€ข Keywords: Thirteen-lined, Ground squirrel, Uncoupling protein, Hibernation, Thermogenesis, UCP1

Labels: MiParea: Respiration, Genetic knockout;overexpression, Comparative MiP;environmental MiP 

Organism: Other mammals  Tissue;cell: Nervous system, HEK  Preparation: Isolated mitochondria 

Coupling state: LEAK, OXPHOS  Pathway:HRR: Oxygraph-2k