A key player in mast cell activation is the high affinity IgE receptor, Fc5RI. While much is known about the chain of events initiated by crosslinking of Fc?RI through multivalent antigen, there is a fundamental gap in our understanding of how protein dynamics facilitate signaling. Our long term goal is to understand how the dynamic and stochastic behavior of protein-protein interactions influences signal propagation. The objective of this proposal is to quantify dynamic protein interactions during early events in Fc?RI signaling. Our central hypothesis is that the duration of protein-protein interactions modulates the signaling outcome. The rationale for the proposed research is that understanding the role of protein-protein interaction dynamics in signaling is the next step in understanding how the cell shapes the strength and quality of an immune response. We will integrate multiple imaging modalities, both novel and established, to capture and quantify early events that govern Fc?RI membrane associated signaling in order to achieve three specific aims: 1) To determine the interaction lifetime and diffusional dynamics that facilitate Fc?RI activation;2) To quantify the kinetics of Syk adaptor protein binding to the signaling complex;and 3) To determine the cluster stability of LAT and the interplay between Fc?RI and LAT signaling patches. The approach is innovative because we will develop methodology for imaging biochemical events at the molecular level that will allow us to obtain dynamic information about signaling events that cannot be determined using traditional biochemistry techniques. The proposed research is significant because the quantitative information that we propose to obtain has not been directly measured before and will bring new perspectives to the cell biology community. Furthermore, the development of multi-color single molecule imaging techniques described here will be applicable to many other fundamental biological questions. The information we gain about Fc5RI signaling will help to fill the gaps in our knowledge of how Fc5RI initiates signaling. Ultimately, we expect that this information will open new avenues for drug design that target protein interactions and localization.
This proposal is relevant to public health since the activation of mast cells is implicated in many physiological responses from allergy and asthma to rheumatoid arthritis and cancer. In order to further our fundamental understanding of mast cell signaling, we will quantify protein interactions and dynamics at the molecular level using innovative imaging techniques. Therefore, the proposal is relevant to the part of NIH's mission that is in pursuit of fostering fundamental creative discoveries, innovative research strategies, and their applications to biomedical problems.
| Brandsma, Arianne M; Schwartz, Samantha L; Wester, Michael J et al. (2018) Mechanisms of inside-out signaling of the high-affinity IgG receptor Fc?RI. Sci Signal 11: |
| Hatch, Ellen W; Geeze, Mary Beth; Martin, Cheyenne et al. (2018) Variability of PD-L1 expression in mastocytosis. Blood Adv 2:189-199 |
| Schwartz, Samantha L; Cleyrat, Cédric; Olah, Mark J et al. (2017) Differential mast cell outcomes are sensitive to Fc?RI-Syk binding kinetics. Mol Biol Cell 28:3397-3414 |
| Relich, Peter K; Olah, Mark J; Cutler, Patrick J et al. (2016) Estimation of the diffusion constant from intermittent trajectories with variable position uncertainties. Phys Rev E 93:042401 |
| Erasmus, M Frank; Matlawska-Wasowska, Ksenia; Kinjyo, Ichiko et al. (2016) Dynamic pre-BCR homodimers fine-tune autonomous survival signals in B cell precursor acute lymphoblastic leukemia. Sci Signal 9:ra116 |
| Schwartz, Samantha L; Yan, Qi; Telmer, Cheryl A et al. (2015) Fluorogen-activating proteins provide tunable labeling densities for tracking Fc?RI independent of IgE. ACS Chem Biol 10:539-46 |
| Vu, Tania Q; Lam, Wai Yan; Hatch, Ellen W et al. (2015) Quantum dots for quantitative imaging: from single molecules to tissue. Cell Tissue Res 360:71-86 |
| DeVore, M S; Stich, D G; Keller, A M et al. (2015) Note: Time-gated 3D single quantum dot tracking with simultaneous spinning disk imaging. Rev Sci Instrum 86:126102 |
| Carroll-Portillo, Amanda; Cannon, Judy L; te Riet, Joost et al. (2015) Mast cells and dendritic cells form synapses that facilitate antigen transfer for T cell activation. J Cell Biol 210:851-64 |
| Broeken, Jordi; Johnson, Hannah; Lidke, Diane S et al. (2015) Resolution improvement by 3D particle averaging in localization microscopy. Methods Appl Fluoresc 3:014003 |
Showing the most recent 10 out of 15 publications
