The Integration of FLIM and FRET for the Visualization of Flow-induced Molecular Hierarchies The research activity of the PI's laboratory is focused on the integration of cutting edge technologies for the elucidation of molecular mechanism in vascular biology, with the ultimate goal of enhancing our knowledge on cardiovascular functions and contributing to the health and well-being of humankind. In particular, novel imaging biosensors and technologies will be developed and employed to visualize the signaling transduction with high spatiotemporal resolutions in live cells under different mechanical forces, e.g. shear stress. In the long run, we aim to apply the knowledge and insights gained via these novel technologies for the development of new strategies and reagents to treat cardiovascular diseases, including thrombosis and atherosclerosis. Along this line, we proposed to apply biosensors based on fluorescence resonance energy transfer (FRET) to visualize the Src activity and its related molecular hierarchy at sub-cellular levels during mechanotransduction, which is funded by NHLBI (R01HL098472). Since FAK activity and its autophosphorylation at tyrosine 397 are critical for the Src activation, we plan to investigate the spatiotemporal coupling between FAK and Src activations in endothelial cells under mechanical stimulation. Recently, we have developed a new FRET pair, mOrange2 and mCherry, which contains colors distinct from the popular FRET pair, CFP and YFP. As such, two different molecular events, such as the activities of FAK and Src, can be simultaneously monitored in the same live cell with biosensors based on mOrange2/mCherry and CFP/YFP. However, there is a certain overlap between the excitation spectra of mOrange2 and mCherry to cause a non-specific cross- excitation of mCherry, which can cause artifacts and lower the sensitivity of FRET biosensors. Fluorescence lifetime imaging microscopy (FLIM) could help to solve this problem because the emission lifetime measurement of the donor mOrange2 alone is sufficient to deduce the FRET efficiency, without the need to measure the emission lifetime of the acceptor mCherry. The main objective of the current proposal is hence for the PI to obtain in-depth training in optics and fluorescence, particularly FLIM and its associated instruments and imaging analysis. Part of the training requires the PI to attend formal courses and training programs whereas the other aspects of training involve more self-studying and interactions with collaborators. Accordingly, three specific aims are proposed for the research plan: (1) develop a mOrange2/mCherry-based FAK biosensor and characterize it by FLIM;(2) visualize the spatiotemporal map of FAK activity under different flows with FLIM;(3) simultaneously monitor FAK and Src activities under different flows with FLIM. The information obtained will significantly advance our systematic understanding of the molecular mechanism by which different flows affect cardiovascular diseases, such as atherosclerosis and restenosis. The newly developed biosensors will also provide powerful tools for detecting cardiovascular diseases and assessing the efficacy of therapeutic inhibitors.

Public Health Relevance

Endothelial cells (ECs) are continuously exposed to flow and its resultant shear stress, which plays crucial roles in regulating EC function and the ensuing patho-physiological processes, such as atherosclerosis and restenosis. This proposal will allow the PI to obtain in-depth training in optics and fluorescence, particularly FLIM and its associated instruments and imaging analysis, such that the PI can integrate FRET and FLIM to visualize FAK and Src activities simultaneously in live ECs to advance our systematic understanding of the molecular mechanism of mechanotransduction. Therefore, the success of the proposed project will have significant impact on improving public health.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Scientist Development Award - Research (K02)
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Special Emphasis Panel (ZHL1-CSR-K (M4))
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Carlson, Drew E
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University of California San Diego
Engineering (All Types)
Schools of Arts and Sciences
La Jolla
United States
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Kim, Tae-Jin; Sun, Jie; Lu, Shaoying et al. (2014) Prolonged mechanical stretch initiates intracellular calcium oscillations in human mesenchymal stem cells. PLoS One 9:e109378
Liu, Bo; Lu, Shaoying; Hu, Ying-li et al. (2014) RhoA and membrane fluidity mediates the spatially polarized Src/FAK activation in response to shear stress. Sci Rep 4:7008
Lei, Lei; Lu, Shaoying; Wang, Yi et al. (2014) The role of mechanical tension on lipid raft dependent PDGF-induced TRPC6 activation. Biomaterials 35:2868-77
Kim, Tae-Jin; Sun, Jie; Lu, Shaoying et al. (2014) The regulation of ?-adrenergic receptor-mediated PKA activation by substrate stiffness via microtubule dynamics in human MSCs. Biomaterials 35:8348-56
Lu, Shaoying; Seong, Jihye; Wang, Yi et al. (2014) Decipher the dynamic coordination between enzymatic activity and structural modulation at focal adhesions in living cells. Sci Rep 4:5756
Nobis, Max; McGhee, Ewan J; Morton, Jennifer P et al. (2013) Intravital FLIM-FRET imaging reveals dasatinib-induced spatial control of src in pancreatic cancer. Cancer Res 73:4674-86
Qian, Tongcheng; Lu, Shaoying; Ma, Hongwei et al. (2013) FRET imaging of calcium signaling in live cells in the microenvironment. Integr Biol (Camb) 5:431-8
Seong, Jihye; Wang, Ning; Wang, Yingxiao (2013) Mechanotransduction at focal adhesions: from physiology to cancer development. J Cell Mol Med 17:597-604
Lin, Li-Jung; Grimme, Jill M; Sun, Jie et al. (2013) The antagonistic roles of PDGF and integrin ?v?3 in regulating ROS production at focal adhesions. Biomaterials 34:3807-15
Sun, Jie; Lu, Shaoying; Ouyang, Mingxing et al. (2013) Antagonism between binding site affinity and conformational dynamics tunes alternative cis-interactions within Shp2. Nat Commun 4:2037