The available data suggest that among cellular constituents, proteins are the major target for oxidation primarily because of their quantity and high rate of interactions with ROS. Proteins are susceptible to ROS modifications of amino acid side chains which alter protein structure. Among the amino acids, Cysteine (Cys) is more prone to oxidation by ROS because of its high nucleophilic property. The reactivity of Cys with ROS is due to the presence of thiol group. In the oxidised form, Cys forms disulfide bond, which are primary covalent cross-link found in proteins, and which stabilize the native conformation of a protein. Indirect evidence suggests that thiol modifications by ROS may be involved in neurodegenerative disorders, but the significance and precise extent of the contributions are poorly understood. Here, we review the role of oxidized Cys in different pathological consequences and its biochemistry may increase the research in the discovery of new therapies. The purpose of this review is to re-examine the role and biochemistry of oxidised Cys residues.

Gilbert syndrome (GS) is a liver disorder characterized by non-hemolytic unconjugated hyperbilirubinemia. On the other hand, Coronavirus disease 2019 (Covid-19) is a recent viral infectious disease presented as clusters of pneumonia, triggered by the severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2). Little is known on the association between SARS-CoV-2 and GS, despite different studies have recently stated a link between hyperbilirubinemia and SARS-CoV-2 severity. In this case-report study we described a 47-year-old man, a known case of GS since the age of 4, presented to the emergency department with fever (39.8°C), dry cough, dyspnea, headache, myalgia, sweating and jaundice diagnosed with Covid-19-induced pneumonia. Interestingly, GS patient exhibited a rapid clinical recovery and short hospital stay compared to other SARS-CoV-2 positive patient, seeming that hyperbilirubinemia may exert a protective effect of against Covid-19 induced-cardiometabolic disturbances. Data obtained here underlines that the higher resistance against Covid-19 evidenced by the GS patient seems to be due to the antioxidant, anti-inflammatory, and antiviral effects of unconjugated bilirubin.

Objective:Hepatitis is a serious health concern with a high rate of mortality and morbidity world over. Saudi Arabia also has its course of the disease incidence. The data on the prevalence of the disease is still limiting. This study aimed to estimate the prevalence of hepatitis B virus [HBV] and hepatitis C virus [HCV] infection in the Jazan region and study its effects on hematological and hepatic parameters.Methods:This cross-sectional study was conducted at premarital screening centre located in King Fahd Central Hospital, Jazan, Kingdom of Saudi Arabia. A total of 7,826, Saudi couples undertaking premarital screening from Jazan region, were enrolled in the study and screened between January 2014 and June 2015 for hepatitis B virus and hepatitis C virus. Complete blood counts and hepatic profile were carried out for individuals who were Hepatitis B and or C virus positive.Results:A higher prevalence of hepatitis virus infection in male participants [HBV 1.9%; HCV 0.4%] than in females [HBV 1.43%; HCV 0.2%] was seen. The neutrophil-to-lymphocyte (NLR) and platelet-to-lymphocyte (PLR) ratios were significantly decreased among HBV- and HCV-infected patients. The concentration of hepatic enzymes showed a statistically significant increase in seropositive individuals. The levels of albumin were significantly decreased in individuals with hepatitis B and C when compared with the control groupConclusions:The study concludes that the prevalence of HBV infection among Saudi subjects in Jazan was higher than the prevalence of HCV infection, and both HBV and HCV were higher in men than in women.

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Advanced glycation end products (AGEs) are implicated in several central nervous system (CNS) pathologies including Alzheimer and Parkinson's diseases. In the face-off of AGE menace, we have attempted to investigate the zinc oxide nanoparticle (ZnONP) role in inhibition of AGE formation. Synthesized ZnONPs were used to investigate the inhibitory effects on AGE formation. The inhibitory effects of ZnONPs on AGE formation were determined by biophysical immunological and biochemical techniques. The results showed that ZnONP is a potential anti-glycating agent inhibiting AGE formation as well as protecting the protein structure from change. Therefore, our findings suggest ZnONPs may be used as a therapeutic in resolving the AGE role in CNS-related complications.