X-ray fluorescence microscopes offer the highest sensitivity for studies of the role of trace metals in cells, and they provide essential informatio for understanding the ultrastructural targeting of nanoparticles used for potential cancer therapies. With ARRA support from the NIH, co-PI Woloschak et al. have obtained the Bionanoprobe at Argonne's Advanced Photon Source (the nation's premier hard x-ray synchrotron light source facility). This is a first-of-its-kind instrument for x-ray fluorescence studies of trace elements in cells and tissue sections which offers a thousandfold improvement in sensitivity compared to electron microprobes, cryo transfer conditions to work with fully hydrated specimens at the highest preparation fidelity possible, and 3D tomographic imaging capabilities. Our proposal is to devote the scientific and technical effort needed to realize this new instrument's potential. Since hard x-ray microscopes are able to image samples with thicknesses ranging up to tens of micrometers, we can study whole cells and tissue sections in 3D in a way that electron microscopes cannot, and with a combination of sub-50 nm spatial resolution and sensitive trace element quantitation available in no other method. Cryogenic conditions are required to minimize radiation damage effects and maximize the fidelity of ultrastructure and trace element concentrations, so we need to develop and validate the novel cryogenic sample preparation methods appropriate for our unique sample types. X-ray fluorescence is relatively blind to the light elements (such as organic materials and water) that comprise nearly all the mass and ultrastructure of cells. Fortunately, we have pioneered several methods that can make visible what was once """"""""dark,"""""""" and we will develop a variant of these approaches (ptychography, a method of scanned coherent imaging that delivers quantitative phase contrast and spatial resolution beyond the limit of x-ray optics) and turn this into a routin, simultaneous-with-fluorescence imaging method for users of the Bionanoprobe. To validate these approaches and work from the beginning on a crucial biomedical research project, we will do this in the context of ongoing research in the use of DNA-conjugated nanoparticles containing titanium and/or gadolinium that are meant to target mitochondria for the treatment and imaging of prostrate, breast, and other cancers. In this way, we will develop the methods needed to fully realize the investment NIH has already made in the Bionanoprobe.

Public Health Relevance

We will develop methods for preparing cryogenic biological specimens, and for combining high resolution phase contrast imaging with x-ray fluorescence imaging of trace elements. We will develop these capabilities along with research into nanoparticle-based drugs and labeling agents, to realize the full potential of a new, first-of-its-kind instrument.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
1R01GM104530-01
Application #
8421911
Study Section
Enabling Bioanalytical and Imaging Technologies Study Section (EBIT)
Program Officer
Swain, Amy L
Project Start
2013-02-15
Project End
2017-01-31
Budget Start
2013-02-15
Budget End
2014-01-31
Support Year
1
Fiscal Year
2013
Total Cost
$283,578
Indirect Cost
$93,578
Name
Northwestern University at Chicago
Department
Physics
Type
Schools of Arts and Sciences
DUNS #
160079455
City
Evanston
State
IL
Country
United States
Zip Code
60201
Brown, Koshonna; Thurn, Ted; Xin, Lun et al. (2018) Intracellular in situ labeling of TiO2 nanoparticles for fluorescence microscopy detection. Nano Res 11:464-476
Jacobsen, Chris (2018) Relaxation of the Crowther criterion in multislice tomography. Opt Lett 43:4811-4814
Deng, Junjing; Vine, David J; Chen, Si et al. (2017) X-ray ptychographic and fluorescence microscopy of frozen-hydrated cells using continuous scanning. Sci Rep 7:445
Jin, Qiaoling; Paunesku, Tatjana; Lai, Barry et al. (2017) Preserving elemental content in adherent mammalian cells for analysis by synchrotron-based x-ray fluorescence microscopy. J Microsc 265:81-93
Jacobsen, Chris; Deng, Junjing; Nashed, Youssef (2017) Strategies for high-throughput focused-beam ptychography. J Synchrotron Radiat 24:1078-1081
G├╝rsoy, Do?a; Hong, Young P; He, Kuan et al. (2017) Rapid alignment of nanotomography data using joint iterative reconstruction and reprojection. Sci Rep 7:11818
Di, Zichao Wendy; Chen, Si; Hong, Young Pyo et al. (2017) Joint reconstruction of x-ray fluorescence and transmission tomography. Opt Express 25:13107-13124
Deng, Junjing; Hong, Young Pyo; Chen, Si et al. (2017) Nanoscale x-ray imaging of circuit features without wafer etching. Phys Rev B 95:
Colvin, Robert A; Jin, Qiaoling; Lai, Barry et al. (2016) Visualizing Metal Content and Intracellular Distribution in Primary Hippocampal Neurons with Synchrotron X-Ray Fluorescence. PLoS One 11:e0159582
Mak, Rachel; Wild, Stefan M; Jacobsen, Chris (2016) Non-negative matrix analysis in x-ray spectromicroscopy: choosing regularizers. AIP Conf Proc 1696:

Showing the most recent 10 out of 27 publications