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Proteomic method identifies proteins nitrated in vivo during inflammatory challenge
1Department of Immunology, Lerner Research Institute, and Cole Eye Institute, Cleveland Clinic, Cleveland, OH, 44195, USA. aulakk@ccf.org
Summary
Inflammation increases protein nitration, a modification linked to disease. Researchers identified over 40 nitrated proteins, revealing new insights into how nitric oxide (NO) impacts cellular functions during inflammatory responses.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- Inflammation in diseases like asthma and sepsis involves increased nitric oxide (NO) synthesis and protein nitration.
- Protein nitration at tyrosine residues can lead to dysfunction and is implicated in disease pathogenesis.
- Few specific proteins nitrated in vivo have been identified, limiting understanding of this modification's impact.
Purpose of the Study:
- To identify proteins targeted by nitration during inflammatory responses.
- To understand the physiological and pathological implications of protein nitration in vivo.
- To broaden the understanding of nitric oxide's regulatory roles in cellular processes.
Main Methods:
- Utilized a proteomic approach to identify targets of protein nitration.
- Analyzed both in vivo and cell culture models of inflammatory diseases.
- Employed nitrotyrosine-immunostaining to detect modified proteins.
Main Results:
- Identified over 40 proteins exhibiting nitrotyrosine-immunopositivity.
- Discovered 30 novel nitrated proteins not previously identified.
- These targets are involved in critical cellular functions including oxidative stress, apoptosis, and metabolism.
Conclusions:
- Protein nitration is a widespread consequence of inflammatory responses.
- The identified nitroproteome provides a comprehensive view of NO-mediated modifications.
- This research broadens the understanding of how NO regulates cellular processes in health and disease.