Seeing the forest and trees: whole-body and whole-brain imaging for circadian biology

Diabetes, Obesity & Metabolism
K L Ode, H R Ueda

Abstract

Recent advances in methods for making mammalian organs translucent have made possible whole-body fluorescent imaging with single-cell resolution. Because organ-clearing methods can be used to image the heterogeneous nature of cell populations, they are powerful tools to investigate the hierarchical organization of the cellular circadian clock, and how the clock synchronizes a variety of physiological activities. In particular, methods compatible with genetically encoded fluorescent reporters have the potential to detect circadian activity in different brain regions and the circadian-phase distribution across the whole body. In this review, we summarize the current methods and strategy for making organs translucent (removal of lipids, decolourization of haemoglobin and adjusting the refractive index of the specimen). We then discuss possible applications to circadian biology. For example, the coupling of circadian rhythms among different brain regions, brain activity in sleep-wake cycles and the role of migrating cells such as immune cells and cancer cells in chronopharmacology.

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Citations

Sep 10, 2016·Scientific Reports·Hiroyuki TamiyaMasahiro Akishita
Jun 15, 2016·Annual Review of Cell and Developmental Biology·Kazuki TainakaHiroki R Ueda

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