Basic nutritional investigationProtective effects of D-glucaro 1,4-lactone against oxidative/nitrative modifications of plasma proteins
Introduction
D-glucaro 1,4-lactone (1,4-GL) is formed in the gastrointestinal tract from D-glucaric acid or its salts and is transported to blood where it can have effects on blood components [1]. D-glucaric acid is a natural, non-toxic compound found in large amounts in many different fruits and vegetables, with the highest concentrations in oranges, apples, grapefruits, and cruciferous vegetables; it also may be produced in small amounts by mammals (including humans) [2]. 1,4-GL possesses detoxifying and anticarcinogenic properties, attributed to an ability to increase glucuronidation and excretion of potentially toxic compounds [3]. 1,4-GL with some biological properties is the most pharmacologically active metabolite of D-glucaric acid. It is a β-glucuronidase inhibitor [4]. The aim of the present study was to estimate the direct effects of 1,4-GL on changes induced by strong biological oxidants, i.e., peroxynitrite (ONOO−) and hydroperoxide (H2O2), in plasma proteins and on the level of total free thiol groups and low-molecular-weight thiols such as glutathione and homocysteine (HCSH) in plasma. The defense mechanisms against oxidative stress (ONOO− and H2O2 action) are very important for biological activities of human plasma components. Moreover, the role of exogenous antioxidants (present in the human diet) in the defense against oxidative stress in human plasma is still unknown. Therefore, the protective effects of 1,4-GL against the oxidative/nitrative damage of human plasma proteins and low-molecular-weight thiols (glutathione and HCSH as important components of plasma redox thiol status) induced by ONOO− (0.1 mM) and H2O2 (2 mM) were studied. The concentration of ONOO− used in our experiments was relatively high. The lifetime of ONOO− at physiologic pH is very short, with its half-time being of the order of 1 s. Exposure to a bolus of 250 μM of ONOO− is equivalent to 7 min of exposure to a steady-state ONOO− concentration of 1 μM. This concentration could be readily formed at sites of inflammation, where production rates of nitric oxide radicals (NO•) and superoxide radicals considerably increase [5].
Section snippets
Materials
Peroxynitrite was synthesized according to the method of Pryor and Squadrito [6]. Freeze fractionation (−70°C) of the peroxynitrite solution formed a yellow top layer, which was retained for further studies. The top layer typically contained 80–100 mM of peroxynitrite as determined spectrophotometrically at 302 nm in 0.1 M of NaOH (ϵ302nm = 1679 M/cm). Some experiments were also performed with decomposed ONOO−, which was prepared by allowing the ONOO− to decompose at neutral pH (7.4) in 100 mM
Results
Our studies showed that 1,4-GL decreased the oxidation of plasma proteins (measured as the level of carbonyl groups by ELISA) caused by treatment of plasma with two different strong oxidants (2 mM of H2O2 or 0.1 mM of ONOO−). The decrease induced by 1,4-GL was statistically significant (P < 0.05; Fig. 1) and inhibition was dose dependent. 1,4-GL at the highest concentration (6.4 mM) decreased carbonyl group formation in plasma proteins treated with ONOO− (0.1 mM) by approximately 40% (Fig. 1).
Discussion
Proteins may be the initial targets of reactive oxygen species or reactive nitrogen species (ROS/RNS) [14], [15]. It has been demonstrated that reaction of proteins with ROS/RNS results in the oxidation and nitration of some amino acid residues, loss of protein thiol groups, formation of aggregates, or fragmentation of proteins. In oxidized proteins new carbonyl groups and protein hydroperoxides are also formed. Among the various oxidative modifications of proteins, formation of carbonyl groups
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This work is supported by the grant 506/810 from the University of Lodz.