This renewal application is a continuation of efforts to detect colorless biomolecules in the visible spectral region by designing synthetic organic indicators with high analyte specificity. The broad, long-term objective of this program is to facilitate the diagnosis and understanding of disease via the creation of practical new tools for biomedical research. Elevated plasma homocysteine (Hcy) levels are associated with increased risk of myocardial infarction, stroke and venous thromboembolism. Homocysteine has also been linked to increased risk of Alzheimer's disease, neural tube defects and complications during pregnancy, inflammatory bowel disease and osteoporosis. Despite over 20 years of intense study, the actual role of homocysteine in disease remains unclear. The goals are to contribute to (i) clarifying the current understanding of the role of homocysteine in disease and (ii) facilitate the study homocysteine in natural media. The approach to these two issues is rooted in fundamental organic chemistry. Uncovering the differences in the basic organic chemistry between Hcy and other thiols and biomolecules will afford new knowledge relevant to Hcy's involvement in disease and concurrently lead to highly selective and enabling new detection methods. To approach these goals, the following Specific Aims are proposed:
Aim 1. Highly selective indicators for simplifying the determination of homocysteine.
Aim 2. New insights into the chemistry of the homocysteine-derived alpha-amino carbon-centered radical.
Aim 3. Detection and chemistry of protein-bound homocystamide. Each of the Specific Aims of this project involves improving the detection of homocysteine. The presence of homocysteine above certain levels in humans often indicates serious risk for disease. This useful amino acid biomarker has been studied for decades, but its role in disease is still not clear. We propose to create simpler new methods and materials for homocysteine detection as well as clarification of its role in disease. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Research Project (R01)
Project #
2R01EB002044-06A1
Application #
7264268
Study Section
Synthetic and Biological Chemistry A Study Section (SBCA)
Program Officer
Korte, Brenda
Project Start
2001-05-01
Project End
2011-03-31
Budget Start
2007-06-01
Budget End
2008-03-31
Support Year
6
Fiscal Year
2007
Total Cost
$262,500
Indirect Cost
Name
Portland State University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
052226800
City
Portland
State
OR
Country
United States
Zip Code
97207
Chu, Yu-Hsuan; Escobedo, Jorge O; Jiang, Meiyan et al. (2016) Rhodamine analogues for molecular ruler applications. Dyes Pigm 126:46-53
Yang, Xiao-Feng; Huang, Qian; Zhong, Yaogang et al. (2014) A dual emission fluorescent probe enables simultaneous detection of glutathione and cysteine/homocysteine. Chem Sci 5:2177-2183
Hakuna, Lovemore; Escobedo, Jorge O; Lowry, Mark et al. (2014) A photochemical method for determining plasma homocysteine with limited sample processing. Chem Commun (Camb) 50:3071-3
Yang, Xiaofeng; Guo, Yixing; Strongin, Robert M (2012) A seminaphthofluorescein-based fluorescent chemodosimeter for the highly selective detection of cysteine. Org Biomol Chem 10:2739-41
Ye, Yanping; Yaeger, Daniel; Owen, Laura J et al. (2012) Designing calcium release channel inhibitors with enhanced electron donor properties: stabilizing the closed state of ryanodine receptor type 1. Mol Pharmacol 81:53-62
Escobedo, Jorge O; Chu, Yu-Hsuan; Wang, Qi et al. (2012) Live cell imaging of a fluorescent gentamicin conjugate. Nat Prod Commun 7:317-20
Morakinyo, Moshood K; Chipinda, Itai; Hettick, Justin et al. (2012) Detailed mechanistic investigation into the S-nitrosation of cysteamine. Can J Chem 9:724-738
Sibrian-Vazquez, Martha; Escobedo, Jorge O; Lowry, Mark et al. (2012) Progress toward red and near-infrared (NIR) emitting saccharide sensors. Pure Appl Chem 84:2443-2456
Guo, Yixing; Yang, Xiaofeng; Hakuna, Lovemore et al. (2012) A fast response highly selective probe for the detection of glutathione in human blood plasma. Sensors (Basel) 12:5940-50
Sibrian-Vazquez, Martha; Escobedo, Jorge O; Lowry, Mark et al. (2012) Field effects induce bathochromic shifts in xanthene dyes. J Am Chem Soc 134:10502-8

Showing the most recent 10 out of 42 publications