Forest White, Ph.D.
Department of Biological Engineering Division
Assistant Professor of Biological Engineering
Ph.D. Analytical Chemistry, 1997
Florida State University
The goal of research in the White lab is to understand how protein phosphorylation-mediated signaling networks drive biological responses to cellular stimulation. If we take a cue-signal-response view of biological systems, we can present the systems with different cues, such as agonists or antagonists, over-expression, mutation, or knock-down of components in the network and monitor biological responses including proliferation, cell motility, endocytosis, and invasiveness. Quantification of the signaling networks which result from each of these cues and drive the corresponding biological response should provide key information regarding the mechanism by which the cue relates to the response. A protein may have multiple phosphorylation sites which control different biological functions and show unique phosphorylation dynamics. A site-specific high-resolution map of the signaling network, with associated temporal dynamics, will enable improved computational modeling of the systems and provide predictive power for more effective targeted interventions in aberrant signaling networks.
Epidermal Growth Factor Receptor Signaling Network
Within this framework, a significant fraction of research in the group is centered on the Epidermal Growth Factor Receptor (EGFR) signaling network, quantifying temporal dynamics of protein phosphorylation within the EGFR network while monitoring changes in the network induced by perturbations at the ligand and receptor level. The goal of this research is to answer several questions in oncogenic signaling: how does the EGFR signaling network change when different ligands (e.g. EGF, TGF-alpha, heregulin) are used to stimulate EGFR or EGFR family members, how do mutations within EGFR or over-expression of EGFR family members affect the signaling network, and what role does the EGFR signaling network play in cancer progression?
T Cell Signaling
T cell signaling is another focus area within the lab, specifically aimed (1) at the signaling networks involved in T cell response to peptide ligand stimulation, with the goal of identifying defective signaling processes which may lead to autoimmune disorders such as Type 1 diabetes, and (2) at signaling networks downstream of IL-2, IL-15, CD3, and CD28 stimulation, with the goal of monitoring the network response to combinations of cytokine stimulations.
To interrogate the signaling networks in these diverse biological systems, we use hybrid quadrupole time-of-flight mass spectrometers coupled with stable-isotope labeling, affinity chromatography, and LC-MS/MS to quantify temporal dynamics of tyrosine phosphorylation on hundreds of proteins simultaneously with site-specific resolution typically from several million cells. After gathering and analyzing the data, we are working with the Lauffenburger and Tidor labs in the Biological Engineering Division at MIT to develop better methods of computational analysis and modeling of signaling networks. These models will then be used to predict biological and signaling network responses to additional perturbations to the system.
- Moser, K; White, F.M. Phosphoproteomic Analysis of Rat Liver by High Capacity IMAC and LC-MS/MS? J. Proteome Res. 98-104 (2006).
- Behr, J.R.; Matsumoto, Y.; White, F.M.; Sasiekharan, R. Quantification of Isomers from a Mixture of 12 Heparin and Heparan Sulfate Disaccharides Using Tandem Mass Spectrometry? Rapid Commun. in Mass Spectrom. 19 , 2553-2562 (2005).
- Kim, J.E.; Tannenbaum, S.R.; White, F.M. Global phosphoproteome of HT-29 human colon adenocarcinoma cells? J. Proteome Res. 4 , 1339-1326 (2005).
- Zhang, Y; Wolf-Yadlin, A.; Pappin, D.J.; Rush, J.; Lauffenburger, D.A.; White, F.M. Time resolved mass spectrometry of tyrosine phosphorylation sites in the EGF receptor signaling network reveals dynamic modules? Mol. Cell. Proteomics 4 , 1240-1250 (2005).
- Chen, W.G.; White, F.M. Proteomic Analysis of Cellular Signaling? Expert Rev. Proteomics 1 , 343-354 (2004).
- Zarling, A.H.; Luckey, C.J.; Marto , J.A.; White, F.M.; Brame, C.J.; Lehner, P. J.; Cresswell, P.; Shabanowitz, J.; Hunt, D.F.; Engelhard, V.H.Tapasin is a facilitator, not an editor, of HLA-B8 peptide binding? J. Immunol. 171 , 5287-5295 (2003).
- Saibil, S.D.; Ohteki, T.; White, F.M.; Luscher, M.; Zakarian, A.; Elford, A.; Shabanowitz, J.; Nishina, H.; Hugo, P.; Penninger, J.; Barber, B.; Hunt, D.F.; Ohashi, P.S. Weak agonist self-peptides promote selection and tuning of virus-specific T cells?, Eur. J. Immunol.33, 685-696 (2003).
Last Updated: April 9, 2008