To be launched on Aug 2015
 
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Dye-based mito-thermometry and its application in thermogenesis of brown adipocytes
Tao-Rong Xie, Chun-Feng Liu, Jian-Sheng Kang
Biophysics Reports    DOI: 10.1007/s41048-017-0039-6
Abstract   PDF (5837KB)
Mitochondrion is the main intracellular site for thermogenesis and attractive energy expenditure targeting for obesity therapy. Here, we develop a method of mitochondrial thermometry based on Rhodamine B methyl ester, which equilibrates as a thermosensitive mixture of nonfluorescent and fluorescent resonance forms. Using this approach, we are able to demonstrate that the efficacy of norepinephrine-induced thermogenesis is low, and measure the maximum transient rate of temperature increase in brown adipocytes.
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Choosing proper fluorescent dyes, proteins, and imaging techniques to study mitochondrial dynamics in mammalian cells
Xingguo Liu, Liang Yang, Qi Long, David Weaver, György Hajnóczky
Biophysics Reports    DOI: 10.1007/s41048-017-0037-8
Abstract   PDF (494KB)
Mitochondrial dynamics refers to the processes maintaining mitochondrial homeostasis, including mitochondrial fission, fusion, transport, biogenesis, and mitophagy. Mitochondrial dynamics is essential for maintaining the metabolic function of mitochondria as well as their regulatory roles in cell signaling. In this review, we summarize the recently developed imaging techniques for studying mitochondrial dynamics including:mitochondrial-targeted fluorescent proteins and dyes, live-cell imaging using photoactivation, photoswitching and cell fusion, mitochondrial transcription and replication imaging by in situ hybridization, and imaging mitochondrial dynamics by super-resolution microscopy. Moreover, we discuss examples of how to choose and combine proper fluorescent dyes and/or proteins.
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Class C G protein-coupled receptors: reviving old couples with new partners
Thor C. Møller, David Moreno-Delgado, Jean-Philippe Pin, Julie Kniazeff
Biophysics Reports    DOI: 10.1007/s41048-017-0036-9
Abstract   PDF (949KB)
G protein-coupled receptors (GPCRs) are key players in cell communication and are encoded by the largest family in our genome. As such, GPCRs represent the main targets in drug development programs. Sequence analysis revealed several classes of GPCRs:the class A rhodopsin-like receptors represent the majority, the class B includes the secretin-like and adhesion GPCRs, the class F includes the frizzled receptors, and the class C includes receptors for the main neurotransmitters, glutamate and GABA, and those for sweet and umami taste and calcium receptors. Class C receptors are far more complex than other GPCRs, being mandatory dimers, with each subunit being composed of several domains. In this review, we summarize our actual knowledge regarding the activation mechanism and subunit organization of class C GPCRs, and how this brings information for many other GPCRs.
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CN 10-1302/Q
ISSN 2364-3439
eISSN 2364-3420
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