G protein coupled receptor (GPCR) initiated signaling regulates important cell behaviors such as migration, differentiation, secretion and contraction. Considerable knowledge exists about the properties of individual molecules that constitute GPCR signaling networks. However, there is much less information about how these molecules act dynamically in a signaling network to orchestrate complex cell behaviors such as cell migration. It has not been possible to answer this question so far because of an absence of methods to exert spatiotemporal control over GPCR activity in a single living cell, evoke responses that faithfully reflect native cell behavior and quantitatively image cellular and molecular response dynamics. We have now developed an approach with all of these characteristics using opsins. Using this approach we have been able to direct cell migration using a light beam. The optically directed cell migration faithfully recapitulates molecular and cellular properties of chemoattractant induced cell migration. High resolution imaging has facilitated quantitation of signaling activity within a single cell and helped develop a computational model of migration. Here we propose to develop the optical tools further and use our optical approach to uncover molecular mechanisms at the basis of cell migration. We will use novel optical approaches to both orchestrate and perturb signaling systems that regulate migration. This will be combined with live cell imaging, biochemical methods and mathematical modeling.
Aim 1. We will develop (i) red opsins that can be used together with the blue light activated CRY2 system and (ii) opsins that can be activated for extended periods of time without deactivation.
Aim 2. We will test the model that SHIP1 acts antagonistically to PI3K to control cell migration.
Aim 3. We will identify molecular mechanisms at the basis of adaptation in cell migration. Identifying dynamic mechanisms that control cell migration can provide a better understanding of cancer metastasis, inflammatory diseases and can afford control over morphogenetic movement. Further development of the optical methods here can be of value in redirecting cell migration in the whole animal.

Public Health Relevance

The ability to control GPCR mediated single cell behaviors with different wavelengths of light can be used to interrogate their molecular basis experimentally and direct their function for therapeutic purposes.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM107370-03
Application #
9059737
Study Section
Molecular and Integrative Signal Transduction Study Section (MIST)
Program Officer
Dunsmore, Sarah
Project Start
2014-08-01
Project End
2017-04-30
Budget Start
2016-05-01
Budget End
2017-04-30
Support Year
3
Fiscal Year
2016
Total Cost
Indirect Cost
Name
Washington University
Department
Anesthesiology
Type
Schools of Medicine
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
Meshik, Xenia; O'Neill, Patrick R; Gautam, N (2018) Optogenetic Control of Cell Migration. Methods Mol Biol 1749:313-324
O'Neill, Patrick R; Castillo-Badillo, Jean A; Meshik, Xenia et al. (2018) Membrane Flow Drives an Adhesion-Independent Amoeboid Cell Migration Mode. Dev Cell 46:9-22.e4
O'Neill, Patrick R; Kalyanaraman, Vani; Gautam, N (2016) Subcellular optogenetic activation of Cdc42 controls local and distal signaling to drive immune cell migration. Mol Biol Cell 27:1442-50
Karunarathne, W K Ajith; O'Neill, Patrick R; Gautam, Narasimhan (2015) Subcellular optogenetics - controlling signaling and single-cell behavior. J Cell Sci 128:15-25
O'Neill, P R; Gautam, N (2015) Optimizing optogenetic constructs for control over signaling and cell behaviours. Photochem Photobiol Sci 14:1578-85
Zhao, Zhong-Qiu; Liu, Xian-Yu; Jeffry, Joseph et al. (2014) Descending control of itch transmission by the serotonergic system via 5-HT1A-facilitated GRP-GRPR signaling. Neuron 84:821-34
O'Neill, Patrick R; Gautam, N (2014) Subcellular optogenetic inhibition of G proteins generates signaling gradients and cell migration. Mol Biol Cell 25:2305-14