Radiation Metabolomics
In order to prepare for the possible detonation of a radiological dispersal device (RDD or so-called "dirty bomb"), improvised nuclear device (IND), or radiological accidents, the development of rapid, minimally invasive, and field-deployable biodosimetry is a high priority. Our project addresses this priority with the powerful global profiling capabilities of metabolomics, a biomarker discovery platform uniquely suited for the analysis of easily accessible biofluids, such as blood and urine, that require minimally- or non-invasive procedures to acquire. We have established the field of radiation metabolomics, and have published a series of seminal papers on responses at the small molecule level after radiation. Metabolomics has been used to define signatures of metabolites in urine from mice, rats, non-human primates, and humans.
After a large-scale radiological event, there will be a major need to assess, within a few days, the radiation doses received by tens or hundreds of thousands of individuals. The Center for High Throughput Minimally Invasive Radiation Biodosimetry is a research consortium to develop practical, high throughput, minimally-invasive radiation dose assessment devices and techniques to meet this need.
The Fornace lab is a member of the consortium which includes Columbia University, Georgetown University, Lovelace Repiratory Institute, NYU School of Medicine, Translational Genomics Research Institute, and the University of Bern.
The Center for High Throughput Minimally Invasive Radiation Biodosimetry is one of the Centers for Medical Countermeasures against Radiation (CMCR) supported by the National Institute of Allergy and Infectious Diseases (NIAID) through grant: U19 AI067773.
HUMAN TOTAL-BODY IRRADIATION
In a situation of a radiological accident or dirty bomb dispersal, rapid triage of potentially exposed individuals will be of importance. For this, identification of radiation biomarkers through metabolomics was expanded to a human population. Patients undergoing total body irradiation prior to hematopoietic stem cell transplantation had urine collected before and after one dose of 125cGy (6h post irradiation). Metabolomic profiling, followed by validation of the markers through tandem mass spectrometry, and quantification revealed disturbances in two major pathways, as described below.
•Developing a panel of biomarkers from human biofluids has the potential to evolve into a rapid method of identifying exposed individuals for effective triage in a situation where timely and precise diagnosis would be necessary.
INTERNAL EMMITERS
In the event of a radiological event, radionuclides are feared as they will persist in the food chain and environment. Consumption of water and food will lead to internal exposure, leading to additional radiation exposure over time. We aim to understand the differences between internal and external exposure in terms of biomarker identification and metabolic pathways that are altered. The first study in collaboration with Lovelace Respiratory Research Institute focused on internal exposure to 137Cs. The study lasted for 30 days and mice received cumulative doses between 1.95 and 9.91 Gy (time dependent exposure). As highlighted in the multidimensional scaling plot, the overall metabolic profiles lead to clustering of control versus treated mice in two distinct groups. The differences between external and internal gamma exposure regarding urinary marker identification are highlighted in the table.
TARGETED METABOLOMICS AND LIPIDOMICS
While untargeted metabolomics focuses on global changes and profiling, targeted metabolomics assesses only specific metabolites or pathways. Additional benefits include, with enrichment of samples, to quantify molecules with extremely low concentrations in biological samples. A targeted metabolomics approach was undertaken to assess changes in the serum of irradiated mice.
The Absolute IDQTM p180 kit allowed for the identification of a large number of statistically significant ions, belonging in pathways and categories depicted in the pie chart.
With the targeted oxylipins method we were to identify and quantify the changes in specific categories of low concentration lipids and show for the first time a significant shift from an anti-inflammatory (omega-3) to a pro-inflammatory (omega 6) phenotype following exposure to ionizing radiation (Figures 3A and 3B).
Omega 6 Proinflammatory
Omega 6 Proinflammatory
Omega 3 Anti-Inflammatory
Omega 3 Anti-Inflammatory
SELECTED COLLABORATOR PUBLICATIONS
2022
2021
Pannkuk, E. L., Laiakis, E. C., Girgis, M., Garty, G. Y., Morton, S. R., Pujol-Canadell, M., Ghandhi, S. A., Amundson, S. A., Brenner, D. J., Fornace, A. J. Jr. Biofluid Metabolomics of Mice Exposed to External Low-Dose Rate Radiation in a Novel Irradiation System, the Variable Dose-Rate External 137Cs Irradiator. J Proteome Res. 2021. PMID: 34585931
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OTHERS:
Astarita G, Kate Yu. New Frontiers for Mass Spectrometry in Lipidomics, Part I. LCGC, Feb 2012.
Astarita G, Kate Yu. New Frontiers for Mass Spectrometry in Lipidomics, Part II. LCGC, Jun 2012.
Astarita G The omega-3 Odyssey. The Analytical Scientist. September 2013, Issue#0813.
Interview with Giuseppe Astarita. January MetaboNews 2014
Astarita G. Metabolomics In Food And Nutrition Laboratories. LCGC APRIL 1, 2014.