The goal of my proposecJ research is to characterize lipid-mediated lateral organization in cell plasma membranes and to decipher the underlying physical mechanisms that give rise to this structure. In so doing, I will surmount significant barriers currently facing cell membrane research by developing new experimental tools to manipulate and test the functional consequences of lipid-mediated organization in living cells. My past success in deciphering liquid immiscibility in simple model membranes forms the foundation for my current and future studies in biological membranes. In my early postdoctoral work with Baird Laboratory at Cornell University, I identified robust critical fluctuations in plasma membrane vesicles isolated from RBL mast cells. This result strongly supports my working hypothesis that critical fluctuations are present in cell plasma membranes at physiological temperatures. In the mentored stage of this award, I have implemented experimental and analytic techniques to quantify and interpret nanometer-size organization on the intact cell surface (Aim 1), and I have investigated the functional effects of plasma membrane composition and structure on the IgE-mediated signaling pathway in RBL mast cells (Aim 2). Through these studies, I successfully applied this quantitative and biophysically motivated approach to this biomedically relevant area of research. As an independent researcher, I will continue work on both aims, eventually deciphering the physical basis of membrane lateral organization (Aim 1), and developing novel methodologies to probe the functional consequences of lipid-mediated lateral heterogeneity in antigen induced immune cell signaling processes (Aim 2). My long term goal is develop general methods to probe the functional roles of lipids in a wide range of processes and cell types which will enable new lines of study into the biomedical consequences of lipid mediated plasma membrane organization in cells. The Pathway to Independence Award has given me the independence to focus deeply on my biological training in my postdoctoral years, and the resources to smoothly transition into my current independent faculty position.

Public Health Relevance

It is widely accepted that plasma membrane lateral heterogeneity plays important functional roles in normal cell processes and in the development and maintenance of human diseases. I will open new opportunities for intervention in cell membrane-based pathologies by developing effective experimental techniques and a clear conceptual framework in which to study lipids and proteins in native membranes.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Transition Award (R00)
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Special Emphasis Panel (NSS)
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Chin, Jean
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University of Michigan Ann Arbor
Schools of Arts and Sciences
Ann Arbor
United States
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Gray, Erin M; Díaz-Vázquez, Gladys; Veatch, Sarah L (2015) Growth Conditions and Cell Cycle Phase Modulate Phase Transition Temperatures in RBL-2H3 Derived Plasma Membrane Vesicles. PLoS One 10:e0137741
Grover, Jonathan R; Veatch, Sarah L; Ono, Akira (2015) Basic motifs target PSGL-1, CD43, and CD44 to plasma membrane sites where HIV-1 assembles. J Virol 89:454-67
Stone, Matthew B; Veatch, Sarah L (2014) Far-red organic fluorophores contain a fluorescent impurity. Chemphyschem 15:2240-6
Edwald, Elin; Stone, Matthew B; Gray, Erin M et al. (2014) Oxygen depletion speeds and simplifies diffusion in HeLa cells. Biophys J 107:1873-84
Shelby, Sarah A; Holowka, David; Baird, Barbara et al. (2013) Distinct stages of stimulated Fc?RI receptor clustering and immobilization are identified through superresolution imaging. Biophys J 105:2343-54
Gray, Ellyn; Karslake, Joshua; Machta, Benjamin B et al. (2013) Liquid general anesthetics lower critical temperatures in plasma membrane vesicles. Biophys J 105:2751-9
Grover, Jonathan R; Llewellyn, G Nicholas; Soheilian, Ferri et al. (2013) Roles played by capsid-dependent induction of membrane curvature and Gag-ESCRT interactions in tetherin recruitment to HIV-1 assembly sites. J Virol 87:4650-64
Pore, Debasis; Parameswaran, Neetha; Matsui, Ken et al. (2013) Ezrin tunes the magnitude of humoral immunity. J Immunol 191:4048-58
Zhao, Jiang; Wu, Jing; Veatch, Sarah L (2013) Adhesion stabilizes robust lipid heterogeneity in supercritical membranes at physiological temperature. Biophys J 104:825-34
Veatch, Sarah L; Chiang, Ethan N; Sengupta, Prabuddha et al. (2012) Quantitative nanoscale analysis of IgE-Fc?RI clustering and coupling to early signaling proteins. J Phys Chem B 116:6923-35

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