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Effects of Glutathione and Histidine on NO Release from a Dimeric Dinitrosyl Iron Complex (DNIC)
Rates of NO release from synthetic dinitrosyl iron complexes (DNICs) are shown to be responsive to coordination environments about iron. The effect of biologically relevant cellular components, glutathione and histidine, on the rate of NO release from a dimeric, Roussin’s Red Ester, DNIC with bridging mu-S thioglucose ligands, SGlucRRE or [(mu-SGluc)Fe(NO)(2)](2) (SGluc = 1-thio-beta-D-glucose tetraacetate), was investigated. From the Griess assay and X-band EPR data, decomposition of the product from the histidine-cleaved dimer, [(SGluc)(N-His)Fe(NO)(2)], generated Fe(III) and increased the NO release rate in aqueous media when compared to the intact SGlucRRE precursor. In contrast, increasing concentrations of exogenous glutathione generated the stable [(SGluc)(GS)Fe(NO)(2)](-) anion and depressed the rate of NO release. Both of the cleaved, monomeric intermediates were characterized with ESI-MS, EPR, and FT-IR spectroscopies. On the basis of the Griess assay coupled with data from an intracellular fluorometric probe, both the monomeric DNICs and dimeric SGlucRRE diffuse into smooth muscle cells, chosen as appropriate archetypes of vascular relaxation, and release their NO payload. Ultimately, this work provides insight into tuning NO release beyond the design of DNICs, through the incubation with safe, accessible biological molecules.
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