Efek Antioksidan dari C-Fikosianin pada Spirulina

Free radicals are the products of normal cellular metabolism containing one or more unpaired electrons, which makes them highly reactive and can cause cell damage and disruption of homeostasis. Depletion of antioxidants and/or accumulation of free radicals can cause oxidative stress which plays a role in the process of various diseases such as inflammatory diseases, cancer, hemochromatosis, emphysema, hypertension and aging. C-phycocyanin is one of the main groups in phycobiliprotein and widely found in spirulina. The purpose of this study was to determine the protective effect of C-phycocyanin against free radicals. This research is in the form of literature review by searching data using two databases namely Pubmed and Google Scholar. The keywords used are C-Phycocyanin Antioxidant Effect. After being selected based on inclusion and exclusion, 10 literature was obtained for review. C-phycocyanin content in spirulina as an antioxidant can function as a defense mechanism against free radicals. In conclusion: the C-phycocyanin content from spirulina has antioxidant effect.Keywords: C-Phycocyanin, antioxidant effect, free radical Abstrak: Radikal bebas merupakan produk normal hasil metabolisme berupa molekul dengan satu atau lebih elektron yang tidak berpasangan, sehingga bersifat sangat reaktif dan dapat menyebabkan kerusakan sel dan terganggunya homeostasis. Deplesi dari antioksidan dan/atau akumulasi radikal bebas dapat menyebabkan stres oksidatif yang berperan dalam proses terjadinya berbagai penyakit seperti penyakit inflamasi, kanker, hemokromatosis, emfismea, hipertensi dan proses penuaan. C-fikosianin merupakan salah satu gugus utama dalam fikobiliprotein yang larut dalam air dan banyak terdapat dalam spirulina. Tujuan penelitian ini adalah untuk mengetahui efek proteksi C-fikosianin terhadap radikal bebas. Penelitian ini berbentuk literature review dengan pencarian data menggunakan dua database yaitu Pubmed dan Google Scholar. Kata kunci yang digunakan yaitu C-Phycocyanin Antioxidant Effect. Setelah diseleksi berdasarkan kriteria inklusi dan eksklusi, didapatkan 10 literatur untuk di review. Kandungan C-fikosianin pada spirulina sebagai antioksidan bisa berfungsi sebagai mekanisme pertahanan terhadap radikal bebas. Sebagai simpulan, kandungan C-Fikosianin dalam spirulina memiliki efek antioksidanKata kunci: C-fikosianin, efek antioksidan, radikal bebas

The effect of computed tomography on oxidative stress level and some antioxidant parameters

Background X-rays are defined as ionizing radiation and hydrolyze the water, causing free radical formation. Oxidative stress is the damage that occurs in cells due to the lack of antioxidants, which detoxifies them, with the increased production of free radicals that occur during normal cellular metabolism. Purpose To examine the acute effects of computed tomography (CT), i.e. ionizing radiation, on oxidative stress and antioxidant defense mechanisms. Material and Methods The study included a total of 53 patients that were selected among the patients that underwent non-contrast full-body CT. Malondialdehyde (MDA) and reduced glutathione (GSH) levels and superoxide dismutase (SOD) and catalase (CAT) activities were investigated in blood samples taken from patients. Results The post-scan levels of MDA increased significantly while the post-scan levels of GSH, SOD, and CAT decreased significantly compared to their pre-scan levels. Conclusion CT, which is a widely used X-ray imaging technique and has numerous known side effects, was found to increase the levels of MDA, which is an indicator of oxidative stress, and to decrease the levels of some antioxidants including GSH, SOD, and CAT.

Co-Operation between Aneuploidy and Metabolic Changes in Driving Tumorigenesis

Alterations from the normal set of chromosomes are extremely common as cells progress toward tumourigenesis. Similarly, we expect to see disruption of normal cellular metabolism, particularly in the use of glucose. In this review, we discuss the connections between these two processes: how chromosomal aberrations lead to metabolic disruption, and vice versa. Both processes typically result in the production of elevated levels of reactive oxygen species, so we particularly focus on their role in mediating oncogenic changes.

What do we actually see in intracellular SERS? Investigating nanosensor-induced variation

Plasmonic nanoparticles (NPs), predominantly gold (AuNPs), are easily internalised into cells and commonly employed as nanosensors for reporter-based and reporter-free intracellular SERS applications. While AuNPs are generally considered non-toxic to cells, many biological and toxicity studies report that exposure to NPs induces cell stress through the generation of reactive oxygen species (ROS) and the upregulated transcription of pro-inflammatory genes, which can result in severe genotoxicity and apoptosis. Despite this, the extent to which normal cellular metabolism is affected by AuNP internalisation remains a relative unknown along with the contribution of the uptake itself to the SERS spectra obtained from within so called ‘healthy’ cells, as indicated by traditional viability tests. This work aims to interrogate the perturbation created by treatment with AuNPs under different conditions and the corresponding effect on the SERS spectra obtained. We characterise the changes induced by varying AuNP concentrations and medium serum compositions using biochemical assays and correlate them to the corresponding intracellular reporter-free SERS spectra. The different serum conditions lead to different extents of nanoparticle internalisation. We observe that changes in SERS spectra are correlated to an increasing amount of internalisation, confirmed qualitatively and quantitatively by confocal imaging and ICP-MS analysis, respectively. We analyse spectra and characterise changes that can be attributed to nanoparticle induced changes. Thus, our study highlights a need for understanding condition-dependent NP-cell interactions and standardisation of nanoparticle treatments in order to establish the validity of intracellular SERS experiments for use in all arising applications.

SOD1 Is Essential for the Viability of DT40 Cells and Nuclear SOD1 Functions as a Guardian of Genomic DNA

Reactive oxygen species (ROSs) are produced during normal cellular metabolism, particularly by respiration in mitochondria, and these ROSs are considered to cause oxidative damage to macromolecules, including DNA. In our previous paper, we found no indication that depletion of mitochondrial superoxide dismutase, SOD2, resulted in an increase in DNA damage. In this paper, we examined SOD1, which is distributed in the cytoplasm, nucleus, and mitochondrial intermembrane space. We generated conditionalSOD1knockout cells from chicken DT40 cells and analyzed their phenotypes. The results revealed that SOD1 was essential for viability and that depletion of SOD1, especially nuclear SOD1, increased sister chromatid exchange (SCE) frequency, suggesting that superoxide is generated in or near the nucleus and that nuclear SOD1 functions as a guardian of the genome. Furthermore, we found that ascorbic acid could offset the defects caused by SOD1 depletion, including cell lethality and increases in SCE frequency and apurinic/apyrimidinic sites.

The systemic delivery and consumption of oxygen in the infant after cardiac surgery

“All the vital mechanisms, however varied they may be, have only one object, that of preserving constant the conditions of life in the internal environment.”1An essential function of the cardiopulmonary system is to generate sufficient flow of oxygenated blood around the circulation in order to maintain normal cellular metabolism. The systemic delivery of oxygen is a function of the cardiac output and the content of oxygen in the systemic arterial blood, while the extent to which metabolising tissues require this oxygen for the maintenance of their integrity and function defines the systemic consumption of oxygen. As metabolising tissues have no mechanism for storing oxygen, they depend on its continuous supply, which must at least match their changing demands. As a result, it is a fundamental requirement of survival that the systemic consumption of oxygen, at all times, is matched by appropriate levels of its delivery.