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  1. Article ; Online: The age-dependent decline of the extracellular thiol-disulfide balance and its role in SARS-CoV-2 infection

    Daniela Giustarini / Annalisa Santucci / Desirée Bartolini / Francesco Galli / Ranieri Rossi

    Redox Biology, Vol 41, Iss , Pp 101902- (2021)

    2021  

    Abstract: SARS–CoV-2 (COVID-19) infection can cause a severe respiratory distress syndrome. The risk of severe manifestations and mortality characteristically increase in the elderly and in the presence of non-COVID-19 comorbidity. We and others previously ... ...

    Abstract SARS–CoV-2 (COVID-19) infection can cause a severe respiratory distress syndrome. The risk of severe manifestations and mortality characteristically increase in the elderly and in the presence of non-COVID-19 comorbidity. We and others previously demonstrated that the low molecular weight (LMW) and protein thiol/disulfide ratio declines in human plasma with age and such decline is even more rapid in the case of inflammatory and premature aging diseases, which are also associated with the most severe complications of COVID-19 infection. The same decline with age of the LMW thiol/disulfide ratio observed in plasma appears to occur in the extracellular fluids of the respiratory tract and in association with many pulmonary diseases that characteristically reduce the concentrations and adaptive stress response of the lung glutathione. Early evidence in literature suggests that the thiol to disulfide balance of critical Cys residues of the COVID-19 spike protein and the ACE-2 receptor may influence the risk of infection and the severity of the disease, with a more oxidizing environment producing the worst prognosis.With this hypothesis paper we propose that the age-dependent decline of LMW thiol/disulfide ratio of the extracellular fluids, could play a role in promoting the physical (protein-protein) interaction of CoV-2 and the host cell in the airways. Therefore, this redox-dependent interaction is expected to affect the risk of severe infection in an age-dependent manner. The hypothesis can be verified in experimental models of in vitro CoV-2 infection and at the clinical level in that LMW thiols and protein thiolation can now be investigated with standardized, reliable and versatile laboratory protocols. Presenting the verification strategy of our hypothesis, we also discuss available nutritional and ancillary pharmacological strategies to intervene on the thiol/disulfide ratio of extracellular fluids of subjects at risk of infection and COVID-19 patients.
    Keywords SARS-CoV-2 ; COVID-19 ; Spike S protein ; ACE-2 receptor ; Aging ; Oxidative stress ; Medicine (General) ; R5-920 ; Biology (General) ; QH301-705.5
    Subject code 610
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Blood Thiol Redox State in Chronic Kidney Disease

    Maria Lisa Garavaglia / Daniela Giustarini / Graziano Colombo / Francesco Reggiani / Silvia Finazzi / Marta Calatroni / Lucia Landoni / Nicola Marcello Portinaro / Aldo Milzani / Salvatore Badalamenti / Ranieri Rossi / Isabella Dalle-Donne

    International Journal of Molecular Sciences, Vol 23, Iss 2853, p

    2022  Volume 2853

    Abstract: Thiols (sulfhydryl groups) are effective antioxidants that can preserve the correct structure of proteins, and can protect cells and tissues from damage induced by oxidative stress. Abnormal levels of thiols have been measured in the blood of patients ... ...

    Abstract Thiols (sulfhydryl groups) are effective antioxidants that can preserve the correct structure of proteins, and can protect cells and tissues from damage induced by oxidative stress. Abnormal levels of thiols have been measured in the blood of patients with moderate-to-severe chronic kidney disease (CKD) compared to healthy subjects, as well as in end-stage renal disease (ESRD) patients on haemodialysis or peritoneal dialysis. The levels of protein thiols (a measure of the endogenous antioxidant capacity inversely related to protein oxidation) and S -thiolated proteins (mixed disulphides of protein thiols and low molecular mass thiols), and the protein thiolation index (the molar ratio of the S -thiolated proteins to free protein thiols in plasma) have been investigated in the plasma or red blood cells of CKD and ESRD patients as possible biomarkers of oxidative stress. This type of minimally invasive analysis provides valuable information on the redox status of the less-easily accessible tissues and organs, and of the whole organism. This review provides an overview of reversible modifications in protein thiols in the setting of CKD and renal replacement therapy. The evidence suggests that protein thiols, S -thiolated proteins, and the protein thiolation index are promising biomarkers of reversible oxidative stress that could be included in the routine monitoring of CKD and ESRD patients.
    Keywords chronic kidney disease ; end-stage renal disease ; haemodialysis ; peritoneal dialysis ; protein thiols ; S -thiolated proteins ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Effects of Physiological and Pathological Urea Concentrations on Human Microvascular Endothelial Cells

    Graziano Colombo / Alessandra Altomare / Emanuela Astori / Lucia Landoni / Maria Lisa Garavaglia / Ranieri Rossi / Daniela Giustarini / Maria Chiara Lionetti / Nicoletta Gagliano / Aldo Milzani / Isabella Dalle-Donne

    International Journal of Molecular Sciences, Vol 24, Iss 1, p

    2022  Volume 691

    Abstract: Urea is the uremic toxin accumulating with the highest concentration in the plasma of chronic kidney disease (CKD) patients, not being completely cleared by dialysis. Urea accumulation is reported to exert direct and indirect side effects on the ... ...

    Abstract Urea is the uremic toxin accumulating with the highest concentration in the plasma of chronic kidney disease (CKD) patients, not being completely cleared by dialysis. Urea accumulation is reported to exert direct and indirect side effects on the gastrointestinal tract, kidneys, adipocytes, and cardiovascular system (CVS), although its pathogenicity is still questioned since studies evaluating its side effects lack homogeneity. Here, we investigated the effects of physiological and pathological urea concentrations on a human endothelial cell line from the microcirculation (Human Microvascular Endothelial Cells-1, HMEC-1). Urea (5 g/L) caused a reduction in the proliferation rate after 72 h of exposure and appeared to be a potential endothelial-to-mesenchymal transition (EndMT) stimulus. Moreover, urea induced actin filament rearrangement, a significant increase in matrix metalloproteinases 2 (MMP-2) expression in the medium, and a significant up- or down-regulation of other EndMT biomarkers (keratin, fibrillin-2, and collagen IV), as highlighted by differential proteomic analysis. Among proteins whose expression was found to be significantly dysregulated following exposure of HMEC-1 to urea, dimethylarginine dimethylaminohydrolase (DDAH) and vasorin turned out to be down-regulated. Both proteins have been directly linked to cardiovascular diseases (CVD) by in vitro and in vivo studies. Future experiments will be needed to deepen their role and investigate the signaling pathways in which they are involved to clarify the possible link between CKD and CVD.
    Keywords urea ; HMEC-1 ; CVD ; CKD ; vasorin ; differential proteomics ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 570 ; 610
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Superior Properties of N-Acetylcysteine Ethyl Ester over N-Acetyl Cysteine to Prevent Retinal Pigment Epithelial Cells Oxidative Damage

    Gian Marco Tosi / Daniela Giustarini / Lorenzo Franci / Alberto Minetti / Francesco Imperatore / Elena Caldi / Paolo Fiorenzani / Anna Maria Aloisi / Anna Sparatore / Ranieri Rossi / Mario Chiariello / Maurizio Orlandini / Federico Galvagni

    International Journal of Molecular Sciences, Vol 22, Iss 2, p

    2021  Volume 600

    Abstract: Oxidative stress plays a key role in the pathophysiology of retinal diseases, including age-related macular degeneration (AMD) and diabetic retinopathy, which are the major causes of irreversible blindness in developed countries. An excess of reactive ... ...

    Abstract Oxidative stress plays a key role in the pathophysiology of retinal diseases, including age-related macular degeneration (AMD) and diabetic retinopathy, which are the major causes of irreversible blindness in developed countries. An excess of reactive oxygen species (ROS) can directly cause functional and morphological impairments in retinal pigment epithelium (RPE), endothelial cells, and retinal ganglion cells. Antioxidants may represent a preventive/therapeutic strategy and reduce the risk of progression of AMD. Among antioxidants, N-acetyl-L-cysteine (NAC) is widely studied and has been proposed to have therapeutic benefit in treating AMD by mitigating oxidative damage in RPE. Here, we demonstrate that N-acetyl-L-cysteine ethyl ester (NACET), a lipophilic cell-permeable cysteine derivative, increases the viability in oxidative stressed RPE cells more efficiently than NAC by reacting directly and more rapidly with oxidizing agents, and that NACET, but not NAC, pretreatment predisposes RPE cells to oxidative stress resistance and increases the intracellular reduced glutathione (GSH) pool available to act as natural antioxidant defense. Moreover, we demonstrate the ability of NACET to increase GSH levels in rats’ eyes after oral administration. In conclusion, even if experiments in AMD animal models are still needed, our data suggest that NACET may play an important role in preventing and treating retinal diseases associated with oxidative stress, and may represent a valid and more efficient alternative to NAC in therapeutic protocols in which NAC has already shown promising results.
    Keywords oxidative stress ; retinopathy ; retinal pigment epithelium ; age-related macular degeneration ; N-acetyl-L-cysteine ; N-acetyl-L-cysteine ethyl ester ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 610
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Micro-method for the determination of glutathione in human blood

    Giustarini, Daniela / Elena Matteucci / Paolo Fanti / Ranieri Rossi

    Journal of Chromatography B. 2014 Aug. 01, v. 964

    2014  

    Abstract: A new procedure is described for the visible-range spectrophotometric analysis of glutathione (GSH) in microvolumes of blood (as low as 0.5μL) collected by fingerstick. Samples are diluted 1 to 300 (v/v) in a stabilizing solution, followed by ... ...

    Abstract A new procedure is described for the visible-range spectrophotometric analysis of glutathione (GSH) in microvolumes of blood (as low as 0.5μL) collected by fingerstick. Samples are diluted 1 to 300 (v/v) in a stabilizing solution, followed by determination of haemoglobin concentration and by acid deproteination. GSH is then measured in the clear supernatant by colorimetry using DTNB, i.e., 5,5′-dithio-bis(2-nitrobenzoic acid), in aqueous solution at pH 7.8. The DTNB reagent is prepared and kept at pH 6.2 until just prior its addition, thus avoiding spontaneous decomposition of the reagent. The assay is rapid, easy to adapt to large-scale studies and it avoids artefactual oxidation of GSH, a common methodological shortcoming. The method is precise with 1.7 to 3.4% intra-day relative standard deviation (RSD) and 2.2 to 4.2% inter-day RSD, and accurate with −1.4% to 2.3% intra-day relative error (RE) and −2.8% to 1.6% inter-day RE. GSH is recovered by 97.5 to 100% at all tested concentrations. The new colorimetric micro-method was validated by a reliable previously reported HPLC method. The procedure is suitable for minimally invasive investigation of oxidative stress in peripheral blood.
    Keywords aqueous solutions ; blood ; colorimetry ; glutathione ; hemoglobin ; high performance liquid chromatography ; humans ; nitrobenzoic acids ; oxidation ; oxidative stress ; pH ; spectral analysis ; statistical analysis
    Language English
    Dates of publication 2014-0801
    Size p. 191-194.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 1570-0232
    DOI 10.1016/j.jchromb.2014.02.018
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: SARS-CoV2 infection impairs the metabolism and redox function of cellular glutathione

    Desirée Bartolini / Anna Maria Stabile / Sabrina Bastianelli / Daniela Giustarini / Sara Pierucci / Chiara Busti / Carmine Vacca / Anna Gidari / Daniela Francisci / Roberto Castronari / Antonella Mencacci / Manlio Di Cristina / Riccardo Focaia / Samuele Sabbatini / Mario Rende / Antimo Gioiello / Gabriele Cruciani / Ranieri Rossi / Francesco Galli

    Redox Biology, Vol 45, Iss , Pp 102041- (2021)

    2021  

    Abstract: Viral infections sustain their replication cycle promoting a pro-oxidant environment in the host cell. In this context, specific alterations of the levels and homeostatic function of the tripeptide glutathione have been reported to play a causal role in ... ...

    Abstract Viral infections sustain their replication cycle promoting a pro-oxidant environment in the host cell. In this context, specific alterations of the levels and homeostatic function of the tripeptide glutathione have been reported to play a causal role in the pro-oxidant and cytopathic effects (CPE) of the virus. In this study, these aspects were investigated for the first time in SARS-CoV2-infected Vero E6 cells, a reliable and well-characterized in vitro model of this infection. SARS-CoV2 markedly decreased the levels of cellular thiols, essentially lowering the reduced form of glutathione (GSH). Such an important defect occurred early in the CPE process (in the first 24 hpi). Thiol analysis in N-acetyl-Cys (NAC)-treated cells and membrane transporter expression data demonstrated that both a lowered uptake of the GSH biosynthesis precursor Cys and an increased efflux of cellular thiols, could play a role in this context. Increased levels of oxidized glutathione (GSSG) and protein glutathionylation were also observed along with upregulation of the ER stress marker PERK. The antiviral drugs Remdesivir (Rem) and Nelfinavir (Nel) influenced these changes at different levels, essentially confirming the importance or blocking viral replication to prevent GSH depletion in the host cell. Accordingly, Nel, the most potent antiviral in our in vitro study, produced a timely activation of Nrf2 transcription factor and a GSH enhancing response that synergized with NAC to restore GSH levels in the infected cells. Despite poor in vitro antiviral potency and GSH enhancing function, Rem treatment was found to prevent the SARS-CoV2-induced glutathionylation of cellular proteins. In conclusion, SARS-CoV2 infection impairs the metabolism of cellular glutathione. NAC and the antiviral Nel can prevent such defect in vitro.
    Keywords COVID-19 ; SARS-CoV-2 ; Glutathione ; Thiols ; Nrf2 ; Protein glutathionylation ; Medicine (General) ; R5-920 ; Biology (General) ; QH301-705.5
    Subject code 570
    Language English
    Publishing date 2021-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Immediate stabilization of human blood for delayed quantification of endogenous thiols and disulfides

    Giustarini, Daniela / Federico Galvagni / Maurizio Orlandini / Paolo Fanti / Ranieri Rossi

    Journal of chromatography. 2016 Apr. 15, v. 1019

    2016  

    Abstract: Endogenous thiols undergo rapid and reversible oxidation to disulfides when exposed to oxidants and are, therefore, suitable biomarkers of oxidative stress. However, accurate analysis of thiols in blood is frequently compromised by their artifactual ... ...

    Abstract Endogenous thiols undergo rapid and reversible oxidation to disulfides when exposed to oxidants and are, therefore, suitable biomarkers of oxidative stress. However, accurate analysis of thiols in blood is frequently compromised by their artifactual oxidation during sample manipulation, which spuriously elevates the disulfide levels. Here, we describe a validated pre-analytical procedure that prevents both artifactual oxidation of thiols during sample manipulation and their oxidative decay for months in biosamples that are stored at ⿿80°C. Addition of N-ethylmaleimide to blood samples from healthy donors was used to stabilize whole blood, red blood cells, platelets and plasma disulfides, whereas addition of citrate buffer followed by dilution of plasma with H2O was used to stabilize plasma thiols. The concentrations of thiols and disulfides were stable in all biosamples for at least 6 months when analyzed by UV/Vis HPLC at regular intervals. Only 3ml of blood were needed to perform the analyses of thiols and disulfides in the different blood fractions. This pre-analytical procedure is reliable for use in both animal and human prospective studies. Its ease of implementation makes the method suitable for application to multicenter studies where blood samples are collected by different sites and personnel and are shipped to specific specialized laboratories.
    Keywords biomarkers ; blood plasma ; blood sampling ; citrates ; erythrocytes ; high performance liquid chromatography ; humans ; oxidants ; oxidation ; oxidative stress ; prospective studies ; sulfides ; thiols
    Language English
    Dates of publication 2016-0415
    Size p. 51-58.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 1570-0232
    DOI 10.1016/j.jchromb.2016.02.009
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Determination of protein thiolation index (PTI) as a biomarker of oxidative stress in human serum

    Giustarini, Daniela / Federico Galvagni / Graziano Colombo / Isabella Dalle-Donne / Aldo Milzani / Anna Maria Aloisi / Ranieri Rossi

    Analytical biochemistry. 2017,

    2017  

    Abstract: We have introduced protein thiolation index (PTI), i.e. the molar ratio of the sum of all low molecular mass thiols bound to plasma proteins to protein free cysteinyl residues, as a sensitive biomarker of oxidative stress. According to the original ... ...

    Abstract We have introduced protein thiolation index (PTI), i.e. the molar ratio of the sum of all low molecular mass thiols bound to plasma proteins to protein free cysteinyl residues, as a sensitive biomarker of oxidative stress. According to the original procedure its determination requires a rapid separation of plasma and a specific treatment of samples to stabilize thiols. Here we demonstrate that samples can be collected without use of any anticoagulant to prevent blood clotting and without any stabilization of thiols too. This simplification of the determination of PTI makes its analysis more feasible also in routine clinical laboratories.
    Keywords anticoagulants ; biomarkers ; blood coagulation ; blood proteins ; blood serum ; humans ; molecular weight ; oxidative stress ; thiols
    Language English
    Size p. .
    Publishing place Elsevier Inc.
    Document type Article
    Note Pre-press version
    ZDB-ID 1110-1
    ISSN 1096-0309 ; 0003-2697
    ISSN (online) 1096-0309
    ISSN 0003-2697
    DOI 10.1016/j.ab.2017.09.010
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: A seleno-hormetine protects bone marrow hematopoietic cells against ionizing radiation-induced toxicities.

    Desirée Bartolini / Yanzhong Wang / Jie Zhang / Daniela Giustarini / Ranieri Rossi / Gavin Y Wang / Pierangelo Torquato / Danyelle M Townsend / Kenneth D Tew / Francesco Galli

    PLoS ONE, Vol 14, Iss 4, p e

    2019  Volume 0205626

    Abstract: 2,2'-diselenyldibenzoic acid (DSBA) is a chemical probe produced to explore the pharmacological properties of diphenyldiselenide-derived agents with seleno-hormetic activity undergoing preclinical development. The present study was designed to verify in ... ...

    Abstract 2,2'-diselenyldibenzoic acid (DSBA) is a chemical probe produced to explore the pharmacological properties of diphenyldiselenide-derived agents with seleno-hormetic activity undergoing preclinical development. The present study was designed to verify in vivo the drug's properties and to determine mechanistically how these may mediate the protection of tissues against stress conditions, exemplified by ionizing radiation induced damage in mouse bone marrow. In murine bone marrow hematopoietic cells, the drug initiated the activation of the Nrf2 transcription factor resulting in enhanced expression of downstream stress response genes. This type of response was confirmed in human liver cells and included enhanced expression of glutathione S-transferases (GST), important in the metabolism and pharmacological function of seleno-compounds. In C57 BL/6 mice, DSBA prevented the suppression of bone marrow hematopoietic cells caused by ionizing radiation exposure. Such in vivo prevention effects were associated with Nrf2 pathway activation in both bone marrow cells and liver tissue. These findings demonstrated for the first time the pharmacological properties of DSBA in vivo, suggesting a practical application for this type of Se-hormetic molecules as a radioprotective and/or prevention agents in cancer treatments.
    Keywords Medicine ; R ; Science ; Q
    Subject code 616
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: A step-by-step protocol for assaying protein carbonylation in biological samples

    Colombo, Graziano / Aldo Milzani / Daniela Giustarini / Isabella Dalle-Donne / Marco Clerici / Maria Elisa Garavaglia / Ranieri Rossi

    Journal of chromatography. 2016 Apr. 15, v. 1019

    2016  

    Abstract: Protein carbonylation represents the most frequent and usually irreversible oxidative modification affecting proteins. This modification is chemically stable and this feature is particularly important for storage and detection of carbonylated proteins. ... ...

    Abstract Protein carbonylation represents the most frequent and usually irreversible oxidative modification affecting proteins. This modification is chemically stable and this feature is particularly important for storage and detection of carbonylated proteins. Many biochemical and analytical methods have been developed during the last thirty years to assay protein carbonylation. The most successful method consists on protein carbonyl (PCO) derivatization with 2,4-dinitrophenylhydrazine (DNPH) and consequent spectrophotometric assay. This assay allows a global quantification of PCO content due to the ability of DNPH to react with carbonyl giving rise to an adduct able to absorb at 366nm. Similar approaches were also developed employing chromatographic separation, in particular HPLC, and parallel detection of absorbing adducts. Subsequently, immunological techniques, such as Western immunoblot or ELISA, have been developed leading to an increase of sensitivity in protein carbonylation detection. Currently, they are widely employed to evaluate change in total protein carbonylation and eventually to highlight the specific proteins undergoing selective oxidation. In the last decade, many mass spectrometry (MS) approaches have been developed for the identification of the carbonylated proteins and the relative amino acid residues modified to carbonyl derivatives. Although these MS methods are much more focused and detailed due to their ability to identify the amino acid residues undergoing carbonylation, they still require too expensive equipments and, therefore, are limited in distribution. In this protocol paper, we summarise and comment on the most diffuse protocols that a standard laboratory can employ to assess protein carbonylation; in particular, we describe step-by-step the different protocols, adding suggestions coming from our on-bench experience.
    Keywords amino acids ; derivatization ; enzyme-linked immunosorbent assay ; high performance liquid chromatography ; mass spectrometry ; oxidation ; protein content ; proteins
    Language English
    Dates of publication 2016-0415
    Size p. 178-190.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 1570-0232
    DOI 10.1016/j.jchromb.2015.11.052
    Database NAL-Catalogue (AGRICOLA)

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