Displaying publications 1 - 20 of 39 in total

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  1. AlMatar M, Albarri O, Makky EA, Var I, Köksal F
    Curr Drug Targets, 2020;21(13):1326-1343.
    PMID: 32564749 DOI: 10.2174/1389450121666200621193018
    Iron, which is described as the most basic component found in nature, is hard to be assimilated by microorganisms. It has become increasingly complicated to obtain iron from nature as iron (II) in the presence of oxygen oxidized to press (III) oxide and hydroxide, becoming unsolvable at neutral pH. Microorganisms appeared to produce organic molecules known as siderophores in order to overcome this condition. Siderophore's essential function is to connect with iron (II) and make it dissolvable and enable cell absorption. These siderophores, apart from iron particles, have the ability to chelate various other metal particles that have collocated away to focus the use of siderophores on wound care items. There is a severe clash between the host and the bacterial pathogens during infection. By producing siderophores, small ferric iron-binding molecules, microorganisms obtain iron. In response, host immune cells produce lipocalin 2 to prevent bacterial reuptake of siderophores loaded with iron. Some bacteria are thought to produce lipocalin 2-resistant siderophores to counter this risk. The aim of this article is to discuss the recently described roles and applications of bacterial siderophore.
    Matched MeSH terms: Iron/metabolism
  2. Ali Hassan SH, Fry JR, Abu Bakar MF
    Biomed Res Int, 2013;2013:138950.
    PMID: 24288662 DOI: 10.1155/2013/138950
    Garcinia parvifolia belongs to the same family as mangosteen (Garcinia mangostana), which is known locally in Sabah as "asam kandis" or cherry mangosteen. The present study was conducted to determine the phytochemicals content (total phenolic, flavonoid, anthocyanin, and carotenoid content) and antioxidant and acetylcholinesterase inhibition activity of the flesh and peel of G. parvifolia. All samples were freeze-dried and extracted using 80% methanol and distilled water. For the 80% methanol extract, the flesh of G. parvifolia displayed higher phenolic and flavonoid contents than the peel, with values of 7.2 ± 0.3 mg gallic acid equivalent (GAE)/g and 5.9 ± 0.1 mg rutin equivalent (RU)/g, respectively. Anthocyanins were detected in the peel part of G. parvifolia but absent in the flesh. The peel of G. parvifolia displayed higher total carotenoid content as compared to the flesh part with the values of 17.0 ± 0.3 and 3.0 ± 0.0 mg β-carotene equivalents (BC)/100 g, respectively. The free-radical scavenging, ferric reducing, and acetylcholinesterase inhibition effect of the flesh were higher as compared to the peel in both extracts. These findings suggested that the edible part of G. parvifolia fruit has a potential as a natural source of antioxidant and anti-Alzheimer's agents.
    Matched MeSH terms: Iron/metabolism
  3. Aris A, Sharratt PN
    Environ Technol, 2006 Oct;27(10):1153-61.
    PMID: 17144264
    The effect of initial dissolved oxygen concentration (IDOC) on Fenton's reagent degradation of a dyestuff, Reactive Black 5 was explored in this study. The study was designed, conducted and analysed based on Central Composite Rotatable Design using a 3-1 lab-scale reactor. The participation of O2 in the process was experimentally observed and appears to be affected by the dosage of the reagents used in the study. The IDOC was found to have a significant influence on the process. Reducing the IDOC from 7.5 mg l(-1) to 2.5 mg l(-1) increased the removal of TOC by an average of about 10%. Reduction of IDOC from 10 mg l(-1) to 0 mg l(-1) enhanced the TOC removal by about 30%. The negative influence of IDOC is likely to be caused by the competition between the O2 and the reagents for the organoradicals. A model describing the relationship between initial TOC removal, reagent dosage and IDOC has also been developed.
    Matched MeSH terms: Iron/metabolism*
  4. Arumugam K
    Hum Reprod, 1994 Jun;9(6):1153-7.
    PMID: 7962392
    Endometriosis and infertility are commonly associated. This study investigated the role of accelerated lipid peroxidation of spermatozoa by the peritoneal fluid of patients with endometriosis as a cause for this association. It proposes that the increased iron concentration present in the fluid of these patients acts as a catalyst for the process. Peritoneal fluid from 25 patients with endometriosis and 25 matched controls was obtained at laparoscopy. Spermatozoa were incubated in the fluid from both groups and the subsequent acrosome reaction rates analysed. The relationship between these results and iron concentration in the fluid was examined. A significant decrease in the acrosome reaction rate was seen in the endometriotic group (P = 0.034). Overall, a decrease in the acrosome reaction rate was associated with an increased iron concentration in the fluid (18 of the 25 pairs). In mild disease, (six of 11 pairs), the relationship was not as marked as that in severe disease (12 of 14 pairs). These results suggest that the peritoneal fluid in patients with endometriosis has a detrimental action on the acrosome reaction of spermatozoa in vitro.
    Matched MeSH terms: Iron/metabolism*
  5. Arumugam K, Yip YC
    Fertil. Steril., 1995 Jul;64(1):62-4.
    PMID: 7789581
    OBJECTIVE: To show that raised iron levels in the peritoneal fluid (PF) of patients with endometriosis catalyze free radical reactions that results in the tissue destruction and fibrosis seen in these patients.

    DESIGN: A case-controlled study of the iron levels (microgram/mL) in the pelvic PF of 12 patients with moderate-to-severe disease, 15 patients with minimal-to-mild disease and in 17 women with normal pelvises were compared. As an index of free radical reactions through lipid peroxidation, the levels of malondialdehyde levels (ng/mL) were assessed simultaneously in the same specimens.

    RESULTS: Controlling for the phase of the menstrual cycle, significantly higher levels of iron were seen in patients with endometriosis, the levels being correlated with the severity of the disease. However no such corresponding relationship was seen in the malondialdehyde levels in the PF.

    CONCLUSIONS: These results suggest that raised iron levels in the PF do not play a role in catalyzing free radical reactions as judged by the degree of lipid peroxidation.

    Matched MeSH terms: Iron/metabolism*
  6. Azemin WA, Alias N, Ali AM, Shamsir MS
    J Biomol Struct Dyn, 2023 Feb;41(2):681-704.
    PMID: 34870559 DOI: 10.1080/07391102.2021.2011415
    Hepcidin is a principal regulator of iron homeostasis and its dysregulation has been recognised as a causative factor in cancers and iron disorders. The strategy of manipulating the presence of hepcidin peptide has been used for cancer treatment. However, this has demonstrated poor efficiency and has been short-lived in patients. Many studies reported using minihepcidin therapy as an alternative way to treat hepcidin dysregulation, but this was only applied to non-cancer patients. Highly conserved fish hepcidin protein, HepTH1-5, was investigated to determine its potential use in developing a hepcidin replacement for human hepcidin (Hepc25) and as a therapeutic agent by targeting the tumour suppressor protein, p53, through structure-function analysis. The authors found that HepTH1-5 is stably bound to ferroportin, compared to Hepc25, by triggering the ferroportin internalisation via Lys42 and Lys270 ubiquitination, in a similar manner to the Hepc25 activity. Moreover, the residues Ile24 and Gly24, along with copper and zinc ligands, interacted with similar residues, Lys24 and Asp1 of Hepc25, respectively, showing that those molecules are crucial to the hepcidin replacement strategy. HepTH1-5 interacts with p53 and activates its function through phosphorylation. This finding shows that HepTH1-5 might be involved in the apoptosis signalling pathway upon a DNA damage response. This study will be very helpful for understanding the mechanism of the hepcidin replacement and providing insights into the HepTH1-5 peptide as a new target for hepcidin and cancer therapeutics.Communicated by Ramaswamy H. Sarma.
    Matched MeSH terms: Iron/metabolism
  7. Bahari EA, Zaaba NE, Haron N, Dasiman R, Amom Z
    Med Sci Monit Basic Res, 2014;20:170-5.
    PMID: 25381551 DOI: 10.12659/MSMBR.892345
    Roots and leaves of the Cermela Hutan (Phyllanthus gomphocarpus Hook. F) plant were studied to determine antioxidant activity, phytochemical compounds, proportion of carbohydrate, crude protein, moisture, ash, fat, total phenolic content (TPC), and total flavonoid content (TFC).
    Matched MeSH terms: Iron/metabolism
  8. Balveer K, Pyar K, Wonke B
    Med J Malaysia, 2000 Dec;55(4):493-7.
    PMID: 11221163
    Thalassaemics in Malaysia are poorly chelated because desferrioxamine is too expensive and cumbersome for long term compliance. The efficacy and tolerability of the oral chelator deferiprone, and the effects of using a combination therapy in our patients were studied. Ten patients completed the study and the mean serum ferritin reduced from 7066.11 ug/L (2577-12,896 ug/L) to 3242.24 ug/L (955-6120 ug/L). The liver iron concentration did not show a significant drop (19.6 vs 18.2 mg/g dry weight) although 3 patients showed reductions ranging from 30-40%. Concomitant use of desferrioxamine increased the urinary excretion from a mean of 13.66 mg/day to 27.38 mg/day. Main side effects seen were nausea and rashes.
    Matched MeSH terms: Iron/metabolism
  9. Bhat IU, Mauris EN, Khanam Z
    Int J Phytoremediation, 2016 Sep;18(9):918-23.
    PMID: 26940261 DOI: 10.1080/15226514.2016.1156637
    The accumulation and removal efficiency of Fe by Centella asiatica was carried out at various Fe concentrations in soil treatments (0, 50, 100, 150 and 200 mg Fe/kg soil). Iron accumulation in different parts of C. asiatica (leaf, stem and root) was analyzed by atomic absorption spectrophotometer (AAS). Factorial experiment with a completely randomized design and Duncan's test were used for data analyses. The results revealed that C. asiatica have the ability to uptake and accumulate Fe significantly (p 1 and <1, respectively, further supporting its metal hyperaccumulator properties.
    Matched MeSH terms: Iron/metabolism*
  10. Bin Karim MF, Imam H, Sarker MM, Uddin N, Hasan N, Paul N, et al.
    Pak J Pharm Sci, 2015 May;28(3):915-20.
    PMID: 26004725
    In this phyto-pharmacological screening of Pistia stratiotes L leaf and root extracts each separately in two different solvents demonstrated its potential medicinal value. Apparent antioxidant value is demonstrated by DPPH, Nitric oxide scavenging and Ferric ion reducing method. Additionally, total flavonoid and phenolic compounds were measured. The leaf methanolic extract scavenged both nitric oxide (NO) and DPPH radical with a dose dependent manner. But the pet ether fraction of root was found to have highest efficacy in Fe(3±) reducing power assay. Flavonoid was found to contain highest in the pet ether fraction of root (411.35mg/g) in terms of quercetin equivalent, similarly highest amount (34.96mg/g) of total phenolic compounds (assayed as gallic acid equivalents) were found to contain in the same fraction. The methanolic fractions appeared less cytotoxic compared to pet ether extracts. The plant extracts caused a dose dependent decrease in faecal droppings in both castor oil and magnesium sulphate induced diarrhea, where as leaf extracts in each solvent appeared most effective. Also, the plant extracts showed anthelmintic activity in earthworm by inducing paralysis and death in a dose dependent manner. At highest doses (50 mg/ml) all fractions were almost effective as the positive control piperazine citrate (10 mg/ml). Thus, besides this cytotoxic effect it's traditional claim for therapeutic use can never be overlooked.
    Matched MeSH terms: Iron/metabolism
  11. Chen CY, Lee PJ, Tan CH, Lo YC, Huang CC, Show PL, et al.
    Biotechnol J, 2015 Jun;10(6):905-14.
    PMID: 25865941 DOI: 10.1002/biot.201400594
    Fish meal is currently the major protein source for commercial aquaculture feed. Due to its unstable supply and increasing price, fish meal is becoming more expensive and its availability is expected to face significant challenges in the near future. Therefore, feasible alternatives to fish meal are urgently required. Microalgae have been recognized as the most promising candidates to replace fish meal because the protein composition of microalgae is similar to fish meal and the supply of microalgae-based proteins is sustainable. In this study, an indigenous microalga (Chlorella vulgaris FSP-E) with high protein content was selected, and its feasibility as an aquaculture protein source was explored. An innovative photobioreactor (PBR) utilizing cold cathode fluorescent lamps as an internal light source was designed to cultivate the FSP-E strain for protein production. This PBR could achieve a maximum biomass and protein productivity of 699 and 365 mg/L/day, respectively, under an optimum urea and iron concentration of 12.4 mM and 90 μM, respectively. In addition, amino acid analysis of the microalgal protein showed that up to 70% of the proteins in this microalgal strain consist of indispensable amino acids. Thus, C. vulgaris FSP-E appears to be a viable alternative protein source for the aquaculture industry.
    Matched MeSH terms: Iron/metabolism
  12. Choi SB, Lew LC, Hor KC, Liong MT
    Appl Biochem Biotechnol, 2014 May;173(1):129-42.
    PMID: 24648139 DOI: 10.1007/s12010-014-0822-5
    This study aimed at optimizing the production of hyaluronic acid by Lactobacillus acidophilus FTDC 1231 using response surface methodology and evaluating the effects of divalent metal ions along the production pathway using molecular docking. Among different divalent metal ions that were screened, only iron (II) sulphate and copper (II) sulphate significantly (P iron (II) sulphate and 0.16 mol L(-1) of copper (II) sulphate (103 % increase compared to absence of divalent metal ions). Data from molecular docking showed Fe(2+) improved the binding affinity of UDP-pyrophophorylase towards glucose-1-phosphate, while Cu(2+) contributed towards the interaction between UDP-glucose dehydrogenase and UDP-glucose. We have demonstrated that lactobacilli could produce hyaluronic acid at increased concentration upon facilitation by specific divalent metal ions, via specific targets of enzymes and substrates along pentose phosphate pathway.
    Matched MeSH terms: Iron/metabolism*
  13. ENG LL, DEWITT G
    Med J Malaysia, 1964 Jun;18:269-75.
    PMID: 14199445
    Matched MeSH terms: Iron/metabolism*
  14. Foong LC, Imam MU, Ismail M
    J Agric Food Chem, 2015 Oct 21;63(41):9029-36.
    PMID: 26435326 DOI: 10.1021/acs.jafc.5b03420
    The present study was aimed at utilizing defatted rice bran (DRB) protein as an iron-binding peptide to enhance iron uptake in humans. DRB samples were treated with Alcalase and Flavourzyme, and the total extractable peptides were determined. Furthermore, the iron-binding capacities of the DRB protein hydrolysates were determined, whereas iron bioavailability studies were conducted using an in vitro digestion and absorption model (Caco-2 cells). The results showed that the DRB protein hydrolysates produced by combined Alcalase and Flavourzyme hydrolysis had the best iron-binding capacity (83%) after 90 min of hydrolysis. The optimal hydrolysis time to produce the best iron-uptake in Caco-2 cells was found to be 180 min. The results suggested that DRB protein hydrolysates have potent iron-binding capacities and may enhance the bioavailability of iron, hence their suitability for use as iron-fortified supplements.
    Matched MeSH terms: Iron/metabolism*
  15. George E, Adeeb N, Ahmad J
    Med J Malaysia, 1980 Dec;35(2):129-30.
    PMID: 7266404
    Serum ferritin concentration has been measured in pregnant women at their first antenatal visit. Results were analysed according to trimesters. With progression of the pregnancy there is a fall in serum ferritin concentrations. Haemoglobin and red cell indices cannot be used to predict iron status supplemental iron therapy raised the serum ferritin levels.
    Matched MeSH terms: Iron/metabolism*
  16. Giemza-Stokłosa J, Islam MA, Kotyla PJ
    Curr Pharm Des, 2019;25(27):2909-2918.
    PMID: 31686632 DOI: 10.2174/1381612825666190709202804
    BACKGROUND: Ferritin is a molecule that plays many roles being the storage for iron, signalling molecule, and modulator of the immune response.

    METHODS: Different electronic databases were searched in a non-systematic way to find out the literature of interest.

    RESULTS: The level of ferritin rises in many inflammatory conditions including autoimmune disorders. However, in four inflammatory diseases (i.e., adult-onset Still's diseases, macrophage activation syndrome, catastrophic antiphospholipid syndrome, and sepsis), high levels of ferritin are observed suggesting it as a remarkable biomarker and pathological involvement in these diseases. Acting as an acute phase reactant, ferritin is also involved in the cytokine-associated modulator of the immune response as well as a regulator of cytokine synthesis and release which are responsible for the inflammatory storm.

    CONCLUSION: This review article presents updated information on the role of ferritin in inflammatory and autoimmune diseases with an emphasis on hyperferritinaemic syndrome.

    Matched MeSH terms: Iron Metabolism Disorders/blood*
  17. Halmi MI, Zuhainis SW, Yusof MT, Shaharuddin NA, Helmi W, Shukor Y, et al.
    Biomed Res Int, 2013;2013:384541.
    PMID: 24383052 DOI: 10.1155/2013/384541
    Bacteria with the ability to tolerate, remove, and/or degrade several xenobiotics simultaneously are urgently needed for remediation of polluted sites. A previously isolated bacterium with sodium dodecyl sulfate- (SDS-) degrading capacity was found to be able to reduce molybdenum to the nontoxic molybdenum blue. The optimal pH, carbon source, molybdate concentration, and temperature supporting molybdate reduction were pH 7.0, glucose at 1.5% (w/v), between 25 and 30 mM, and 25°C, respectively. The optimum phosphate concentration for molybdate reduction was 5 mM. The Mo-blue produced exhibits an absorption spectrum with a maximum peak at 865 nm and a shoulder at 700 nm. None of the respiratory inhibitors tested showed any inhibition to the molybdenum-reducing activity suggesting that the electron transport system of this bacterium is not the site of molybdenum reduction. Chromium, cadmium, silver, copper, mercury, and lead caused approximately 77, 65, 77, 89, 80, and 80% inhibition of the molybdenum-reducing activity, respectively. Ferrous and stannous ions markedly increased the activity of molybdenum-reducing activity in this bacterium. The maximum tolerable concentration of SDS as a cocontaminant was 3 g/L. The characteristics of this bacterium make it a suitable candidate for molybdenum bioremediation of sites cocontaminated with detergent pollutant.
    Matched MeSH terms: Iron/metabolism
  18. Harvinder GS, Swee WC, Karupaiah T, Sahathevan S, Chinna K, Ahmad G, et al.
    Asia Pac J Clin Nutr, 2016;25(1):26-33.
    PMID: 26965758 DOI: 10.6133/apjcn.2016.25.1.01
    Malnutrition is highly prevalent in Malaysian dialysis patients and there is a need for a valid screening tool for early identification and management. This cross-sectional study aims to examine the sensitivity of the Dialysis Malnutrition Score (DMS) and Malnutrition Inflammation Score (MIS) tools in predicting protein-energy wasting (PEW) among Malaysian dialysis patients.
    Matched MeSH terms: Iron/metabolism
  19. Ismail A
    Biochem Biophys Res Commun, 1988 Jan 15;150(1):18-24.
    PMID: 2962581
    This study was initiated to determine the mechanism of iron-uptake in Salmonella typhi. When stressed for iron, microorganisms produce siderophores to obtain the necessary nutrient. Generally two types of siderophores exist: the phenolate-type predominantly produced by bacteria and the hydroxamate-type commonly secreted by fungi. Results of this investigation showed that S. typhi produced siderophores of the phenolate-type since culture supernatant of the organism grown under iron-deprivation supported the growth of the phenolate-dependent auxotroph. The culture supernatant when extracted for phenolate siderophores, also supported the growth of the phenolate auxotroph but not the hydroxamate auxotroph. Production of phenolate-type siderophores were further confirmed using biochemical assays. These results showed that S. typhi utilized the high-affinity iron transport system to obtain the necessary iron.
    Matched MeSH terms: Iron/metabolism
  20. Jabeen S, Yap HY, Abdullah FFJ, Zakaria Z, Isa NM, Tan YC, et al.
    Genes (Basel), 2019 01 25;10(2).
    PMID: 30691021 DOI: 10.3390/genes10020081
    Although more than 100 genome sequences of Pasteurella multocida are available, comprehensive and complete genome sequence analysis is limited. This study describes the analysis of complete genome sequence and pathogenomics of P. multocida strain PMTB2.1. The genome of PMTB2.1 has 2176 genes with more than 40 coding sequences associated with iron regulation and 140 virulence genes including the complete tad locus. The tad locus includes several previously uncharacterized genes such as flp2, rcpC and tadV genes. A transposable phage resembling to Mu phages was identified in P. multocida that has not been identified in any other serotype yet. The multi-locus sequence typing analysis assigned the PMTB2.1 genome sequence as type ST101, while the comparative genome analysis showed that PMTB2.1 is closely related to other P. multocida strains with the genomic distance of less than 0.13. The expression profiling of iron regulating-genes of PMTB2.1 was characterized under iron-limited environment. Results showed significant changes in the expression profiles of iron-regulating genes (p < 0.05) whereas the highest expression of fecE gene (281 fold) at 30 min suggests utilization of the outer-membrane proteins system in iron acquisition at an early stage of growth. This study showed the phylogenomic relatedness of P. multocida and improved annotation of important genes and functional characterization of iron-regulating genes of importance to the bacterial growth.
    Matched MeSH terms: Iron/metabolism*
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