Harry Ischiropoulos, Ph.D.

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Research Professor of Pediatrics (Neonatology & Newborn Services)
Department: Pediatrics
Graduate Group Affiliations

Contact information
Children's Hospital of Philadelphia
416B Abramson Pediatric Research Center
Philadelphia, PA 19104
Office: 215-590-5320
Lab: 215-590-5319
B.S. (Chemistry)
Wagner College, 1984.
M.S. (Pathology)
New York Medical College, 1987.
Ph.D. (Experimental Pathology)
New York Medical College, 1990.
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Description of Research Expertise

Biological chemistry of nitric oxide in cardiovascular and neuronal systems. Oxidative processes in protein aggregation and neurodegeneration. Mass spectrometry-based discovery and validation of disease biomarkers.

Biological chemistry of nitric oxide; oxidative processes and stress; protein aggregation and neurodegeneration; post-translational protein modifications.

Biochemical analysis of post-translational modifications; liquid chromatography-mass spectrometry; proteomics; nitric oxide detection.

We investigate the biological chemistry and molecular mechanisms of nitric oxide signaling. Nitric oxide is a free radical that mediates blood flow and many other physiological responses within every major organ system.

Currently mass spectrometry-based proteomic data in conjunction with structure-function analysis explore the biochemical and biophysical specificity of two nitric oxide-mediated post-translational modifications cysteine S-nitrosation and tyrosine nitration. Studies explore the consequences of these modifications on protein function in metabolic processes and mitochondrial bioenergetics.

We are also generating inventories of mouse brain proteomes, phosphoproteomes, S-nitrosoproteomes and secretomes. These inventories are used to create 3D-functional landscapes of the mouse brain extracellular space and to identify signaling pathways that influence neuron physiology and neurodegeneration.

Selected Publications

Doulias PT, Tenopoulou M, Greene JL, Raju K, Ischiropoulos H: Nitric oxide regulates mitochondrial fatty acid metabolism through reversible protein S-nitrosylation. Sci Signal 6(256): rs1, Jan 2013.

Thomson L, Tenopoulou M, Lightfoot R, Tsika E, Parastatidis I, Martinez M, Greco TM, Doulias PT, Wu Y, Tang WHW, Hazen SL, Ischiropoulos H: Immunoglobulins against tyrosine-nitrated epitopes in coronary artery disease. Circulation 126(20): 2392-2401, Nov 2012.

Doulias PT, Greene JL, Greco TM, Tenopoulou M, Seeholzer SH, Dunbrack RL, Ischiropoulos H: Structural profiling of endogenous S-nitrosocysteine residues reveals unique features that accommodate diverse mechanisms for protein S-nitrosylation. Proc Natl Acad Sci U S A 107(39): 6958-6963, Sep 2010.

Greco TM, Seeholzer SH, Mak A, Spruce L, Ischiropoulos H: Quantitative mass spectrometry-based proteomics reveals the dynamic range of primary mouse astrocyte protein secretion. J Proteome Res 9(5): 2764-2774, May 2010.

Tsika E, Moysidou M, Guo J, Cushman M, Gannon P, Sandaltzopoulos R, Giasson BI, Krainc D, Ischiropoulos H, Mazzulli JR: Distinct region-specific alpha-synuclein oligomers in A53T transgenic mice: implications for neurodegeneration. J Neurosci 30(9): 3409-3418, Mar 2010.

Parastatidis I, Thomson L, Burke A, Chernysh I, Nagaswami C, Visser J, Stamer S, Liebler DC, Koliakos G, Heijnen HFG, Fitzgerald GA, Weisel JW, Ischiropoulos H: Fibrinogen beta-chain tyrosine nitration is a prothrombotic risk factor. J Biol Chem 283(49): 33846-33853, Dec 2008.

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Last updated: 04/20/2023
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