Recent discoveries on the roles of nitric oxide in human have generated tremendous interest in biologically active transition metal nitrosyl complexes. Among them, the non-heme iron nitrosyl complexes have been identified as products of biosynthetic evolution of nitric oxide, suggested as nitric oxide storage and found to be responsible for several important biological functions. However, these studies were limited to EPR and IR identification of these complexes in solution and the structures of these compounds were not well characterized and understood. The proposed research is to synthesize non-heme iron nitrosyl compounds that mimic biologically active non-heme iron nitrosyls by using specially selected ligands that model amino acids of protein and DNA. The reaction mechanisms and structures of these complexes will be studied by a combination of spectroscopic methods, such as FT-IR, EPR, NMR, UV-vis, X-ray crystallography and electrochemical techniques. Chemical, photolytic and electrochemical methods will be used to achieve the NO release from these complexes and the quantitative NO release kinetics will be investigated by applying nanosecond laser photolysis techniques. These results will provide information on the structures of biologically active non-heme iron nitrosyls, thus helping the neuroscience, physiology and medicinal research communities to understand the diverse biological functions of nitric oxide and its metal complexes, some of which include controlling blood pressure, preventing platelet aggregation, acting as biological messengers and immune system cytotoxic agents, and involving in long-term memory. The kinetic data will be used to identify the NO releasing metal complexes, which could be used in cardiovascular muscle relaxation, cancer therapy, pharmacokinetic studies, and other medicinal applications.

Public Health Relevance

The proposed research is to synthesize and isolate compounds that mimic biologically active non-heme iron-nitrosyl complexes, to study their structures, and to investigate the conditions for NO release. The knowledge generated from this study will assist in selecting NO releasing agents, which can not only be used in pharmacological studies by biologists, but can also be used as medicine in smooth muscle relaxation, inhibiting platelet aggregation, regulating cardiac function, and cancer therapy.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Continuance Award (SC3)
Project #
5SC3GM092301-03
Application #
8266364
Study Section
Special Emphasis Panel (ZGM1-MBRS-X (CH))
Program Officer
Rogers, Michael E
Project Start
2010-06-01
Project End
2014-05-31
Budget Start
2012-06-01
Budget End
2013-05-31
Support Year
3
Fiscal Year
2012
Total Cost
$107,291
Indirect Cost
$33,041
Name
California State University Long Beach
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
006199129
City
Long Beach
State
CA
Country
United States
Zip Code
90840