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Non-invasive in vivo imaging of UCP1 expression in live mice via near-infrared fluorescent protein iRFP720


Autoři: Aya Fukuda aff001;  Shiho Honda aff001;  Norie Fujioka aff001;  Yuya Sekiguchi aff001;  Seiya Mizuno aff002;  Yoshihiro Miwa aff003;  Fumihiro Sugiyama aff002;  Yohei Hayashi aff001;  Ken Nishimura aff001;  Koji Hisatake aff001
Působiště autorů: Laboratory of Gene Regulation, University of Tsukuba, Tsukuba, Ibaraki, Japan aff001;  Laboratory of Animal Science, University of Tsukuba, Tsukuba, Ibaraki, Japan aff002;  Laboratory of Anatomy and Embryology, University of Tsukuba, Tsukuba, Ibaraki, Japan aff003
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0225213

Souhrn

Uncoupling protein 1 (UCP1) is a mitochondrial protein that is expressed in both brown and beige adipocytes. UCP1 uncouples the mitochondrial electron transport chain from ATP synthesis to produce heat via non-shivering thermogenesis. Due to their ability to dissipate energy as heat and ameliorate metabolic disorders, UCP1-expressing adipocytes are considered as a potential target for anti-obesity treatment. To monitor the expression of UCP1 in live mice in a non-invasive manner, we generated the Ucp1-iRFP720 knock-in (Ucp1-iRFP720 KI) mice, in which the gene encoding a near-infrared fluorescent protein iRFP720 is inserted into the Ucp1 gene locus. Using the heterozygous Ucp1-iRFP720 KI mice, we observed robust iRFP fluorescence in the interscapular region where brown adipose tissue is located. Moreover, the iRFP fluorescence was clearly observable in inguinal white adipose tissues in live mice administered with β3-adrenergic receptor agonist CL316,243. We also found that the homozygous Ucp1-iRFP720 KI mice, which are deficient in UCP1, displayed prominent iRFP fluorescence in the inguinal regions at the standard housing temperature. Consistent with this, the mice exhibited expanded populations of beige-like adipocytes in inguinal white adipose tissue, in which the Ucp1 promoter was dramatically activated. Thus, the Ucp1-iRFP720 KI mice provide a convenient model for non-invasive in vivo imaging of UCP1 expression in both brown and beige adipocytes in live mice.

Klíčová slova:

Adipocytes – Fluorescence imaging – Guide RNA – In vivo imaging – Mammalian genomics – Mouse models – Polymerase chain reaction – Thermogenesis


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