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Articles by Zamberi Sekawi
Total Records ( 12 ) for Zamberi Sekawi
  Nagi A. AL-Haj , Nurmas I. Mashan , Mariana N. Shamsudin , Habsah Mohamad , Charles S. Vairappan and Zamberi Sekawi
  Problem statement: Antimicrobial resistance is the major problem of global dimensions with a significant impact on morbidity, mortality and healthcare-associated costs. The problem has recently been worsened by the steady increase in multiresistant strains and by the restriction of antibiotic discovery and development programs. Methicillin-resistant Staphylococcus aureus, pseudomonads and Escherichia coli are a major nosocomial and community-acquired pathogens for which few existing antibiotics are efficacious. The current study was conducted to investigate antibacterial activity of natural seaweed sources. Approach: Gracilaria changii Euchema denticulatum and sea cucumbers extracts against Methicillin-resistant Staphylococcus aureus, Escherichia coli, Streptococcus pyogenes, Vibrio cholerae, Pseudomonas aeruginosa and Klebsiella pneumoniae. Results: The Minimal Inhibitory Concentration (MIC) values and Minimal Bactericidal Concentration (MBC) values of methanol extract were used against all assayed bacteria. Results indicated that G. changii, E. denticulatum and sea cucumbers extracts must possess major antibacterial components against infectious microorganisms. Conclusion: The results obtained indicate that Gracilaria changii and Euchema denticulatum could be a source of natural products with antibiotic modifying activity to be used against multidrug resistant bacteria.
  Rand R. Hafidh , Faridah Abas , Ahmed S. Abdulamir , Fatemeh Jahanshiri , Fatimah Abu Bakar and Zamberi Sekawi
  With the increasing level of the carcinogenic and mutagenic substances in the environment, the research to explore new anticancer compounds has become crucial day after day. Although, many chemical anticancer agents are available, the wide spectrum side effects and emergence of chemotherapy resistant cancer cells among patients have made cancer research and discovery of new anticancer agents from natural products particularly medicinal plants pivotal. This review highlights the cancer research led to new natural anticancer agents discovered by Asian scientists in the period from 2000 to 2008. This review focuses also on the evidence based scientific research that proved the importance of dietary habits particularly the vegetarian diet as a potent factor in reducing the risk of carcinogenesis. Many components isolated from plants have been approved to be potent anticancer agents. The plant-derived polyphenolic compounds are promising nutraceuticals for control of various disorders and cancer. These compounds may be the future developing anticancer drugs with no side effect and low cost for people all around the world. The much lower risk of colon, prostate and breast cancers in Asians, who consume more vegetables, fruits and tea than populations in the western hemisphere, raises the role of flavonoid components as protective factors against carcinogenesis.
  Lai L. Suang , Zamberi Sekawi , Nagi A. Al-Haj , Mariana N. Shamsudin , Rasedee Abdullah and Rahmah Mohamed
  Burkholderia pseudomallei is the causative agent of melioidosis, a serious disease of man and animals. The high mortality of B. pseudomallei infections may cause by lipopolysaccharides, an endotoxin. The biosynthesis of LPS is complex comprising three components, lipid A, core oligosaccharide and O-specific antigen. In the current study, by using the available B. pseudomallei genome database provided by Wellcome. The study demonstrated that the bioinformatics comparative technique was able to annotate LPS genes in Burkholderia pseudomallei. By developing a simple and easy flow chart including the using of Artemis software, total of 44 putative ORFs involved in biosynthesis of lipopolysaccharide for B. pseudomallei and the genetic mapping for the ORFs have been successfully determined using bioinformatics and laboratory approach. It is about 95.7% of success for annotation based on the 46 genes that act as references. In near future, a suitable vaccine or antimicrobial may be developed by targeting the genes encoding the various components essential in LPS biosynthesis and survival of the pathogen.
  Lai L. Suang , Zamberi Sekawi , Nagi A. Al-Haj , Mariana N. Shamsudin , Rasedee Abdullah and Rahmah Mohamed
  Recently several cases of melioidosis have been reported in the tropical climates, especially in Southeast Asia where, it is endemic, it also occurs sporadically throughout the world. The diagnosis of the acute or chronic infection remains challenging. The present study highlight on the optimized and reliable technique based DNA preparation for use in Polymerase Chain Reaction (PCR) assay. PCR amplification with specific pair of primer for each putative gene was proving specific for amplification of genes in Burkholderia pseudomallei strain D286. The PCR mixture with addition of DMSO, formamide and glycerol could ease the PCR optimization where different pairs of primers were involved. The findings of this study have contributed to some information on the molecular bases of the LPS biosynthesis genes in B. seudomallei specifically for strain D286. The specific primer pairs with the PCR mixture could be used in developing a PCR diagnosis of melioidosis.
  Nurmas I. Mashan , Nagi A. Al-Haj , Mariana N. Shamsudin , Habsah Mohamad , Charles S. Vairappan and Zamberi Sekawi
  Polymerase Chain reaction amplification of DNA was performed to used to study the presence and effect of treated and untreated Stapylococcus aureus genes sav1017 and adaB with marine seaweeds Gracilaria changii and Euchema denticulatum. From the sequencing analysis, the changes were detected in the gene sequence of adaB and sav1017, genes after treated with either G. changii or E. denticulatum extract, which involved the substitution of the nucleotide base pair and insertion or deletion of the purine or pyrimidine base. The novel of this study is the extract of G. changii and E. denticulatum interrupting the important function in MRSA and non-MRSA isolates so that this pathogen cannot survive longer than usual. This significant finding can be applied to a medical treatment whereby both of these extracts can be used as an alternative treatment for the infection of S. aureus especially to overcome drug resistance treatment problems in MRSA strains.
  Nagi A. Al-Haj , Lai L. Suang , Mariana N. Shamsudin , Rasedee Abdullah , Rahmah Mohamed and Zamberi Sekawi
  Burkholderia pseudomallei is the causative agent of melioidosis, a serious disease of man and animals. The high mortality of B. pseudomallei infections may cause by Lipopolysaccharides (LPS), an endotoxin. The biosynthesis of LPS is complex comprising three components, lipid A, core oligosaccharide and O-specific antigen. In the current study was designed to further elucidate genes involved in the biosynthesis pathway of LPS in melioidosis agent followed with selected gene product expression with essential function for survival and virulence melioidosis agent. Expression of Bplps0013/lpxA and Bplps0007/rfaF successful expressed the entire proteins in 2 h with sizes of approximately 29 kDa and 43.7 kDa, respectively. The baseline information provided through the present research can be a preliminary approach towards the development of effective therapeutics against melioidosis.
  Nagi A. AL-Haj , E. Amghalia , Mariana N. Shamsudin , Rasedee Abdullah , Rahmah Mohamed and Zamberi Sekawi
  Methicillin-resistant Staphylococcus aureus strains have appeared in countries worldwide and continue to be one of the most common hospital pathogens and it has become increasingly prevalent in community-acquired infections and provided strong evidence for the independent origins of health care-associated Methicillin-resistant Staphylococcus aureus and community-acquired. It has been shown that methicillin-susceptible S. aureus strains become MRSA strains by the acquisition of a staphylococcal cassette chromosome mec element carrying the mecA gene, which is responsible for methicillin resistance and has become essential for the characterization of Staphylococcus aureus clones in epidemiological studies. The objective of this study to identify the staphylococcal cassette chromosome mec types of methicillin-resistant Staphylococcus aureus isolated from different Malaysian Hospitals. PCR amplification and sequencing analysis were performed to determine the SCCmec type of MRSA. The present research successfully established molecular characteristics of local MRSA contribute as initial database of these isolates in order to fully understand the epidemiology, microbiology and pathophysiology of these infections.
  Nagi A. AL-Haj , E. Amghalia , Mariana N. Shamsudin , Rasedee Abdullah , Rahmah Mohamed and Zamberi Sekawi
  For centuries honey had a valued place in traditional medicine, being used in the treatment of wounds and diseases of the gut. The scientific community has now rekindled interest in the therapeutic use of honey in modern medicine and a number of published reports support its use in certain medical conditions, including burns and wounds. The aim of the present study to the effectiveness of the antimicrobial activity of honey against Methicillin-Resistant Staphylococcus aureus (MRSA) and Methicillin-Sensitive Staphylococcus aureus (MSSA) isolates collected from various Malaysian hospitals. Thirty isolated of Staphylococcus aureus were found to be resistant to routinely used higher antibiotics. Using an agar incorporation technique the sensitivity of these strains to honey was tested by the method of minimum inhibitory concentration. All the tested strains of Staphylococcus aureus showed inhibition with honey at concentrations of 25 and 30%. The present study recommended that the multidrug-resistant Staphylococcus aureus infection particularly wound and burns honey may be useful for controlling infection.
  Nagi A. AL-Haj , Nurmas I. Masha , Mariana N. Shamsudin , Habsah Mohamad , Charles S. Vairappan and Zamberi Sekawi
  Methacillin Resistant Staphylococcus aureus (MRSA), Extended Spectrum Beta Lactamase (ESBL) organisms and Multiple Drug Resistant Organism (MDRO). Therefore, this study was designed to explore an alternative antibacterial product derived from seaweed extracts, Gracilaria changii and Euchema denticulatum, through the study of DNA and RNA encoding genes of interest in MRSA and non-MRSA. The target of this study is to amplification of several untreated and treated S. aureus and E. coli genes that are potentially involved in the antibacterial activities through RT-PCR assay. G. changii and E. denticulatum extracts showed inhibitory activity against S. aureus, several genes in this pathogen were chosen to study the effect of both seaweed extracts on the genes through PCR and RT-PCR analysis. However, the predicted inhibitory mechanism of both seaweeds extracts on mecA gene was not fully elucidated in the study. The investigation could scientifically proof the natural products to be potentially potent antibacterial agents.
  Nik Khairul Azizi Nik Ibrahim , Mariana Nor Shamsudin and Zamberi Sekawi
  The current research trend for a new drug development was expanded by using the proteomic approaches. However, the expression on those drug target must be well identified before taking part into proteomics study. One of the most commonly use protocol is the expression profiles on those selected genes during certain simulated conditions. Staphylococcus aureus has been blessed with several virulence factors which are essential for its pathogenicity. One of the most well studied systems is the Two-Component Regulatory Systems (TCRSs). The TCRSs play a vital role in S. aureus survival and it become a good candidate for the specific drug target. Prior to determining the role, this study was made to observe the expression pattern of two TCRS’ regulatory genes during the treatment with antibiotics against two strains of S. aureus; the Methicillin Methicillin Susceptible S. aureus (MSSA) and Methicillin Resistant S. aureus (MRSA). The partial transcripted analysis of the Reverse Transcriptase PCR (RT-PCR) data shows that the rates of expression in selected TCRS genes were different in both strains. Knowing the importance to S. aureus growth and pathogenesis, the TCRS genes can be a good candidate for designing a novel specific drug target against S. aureus, especially the MRSA.
  Nagi A. AL-Haj , Mariana Nor Shamsudin , Raha Abdul Rahim , H. Halimaton , Lai L. Suang , M. Nurmas I. Mashan and Zamberi Sekawi
  Vibrio cholerae has caused severe outbreaks of cholera worldwide with thousands of recorded deaths annually while the Staphylococcus aureus is one of the most significant pathogens causing nosocomial and community-acquired infections. Conventional detection methods for diagnosis of clinical samples, water and food based on culture, microscopy and biochemical testing are limited by the speed of detection, sensitivity and specificity, so it is necessary to develop innovative molecular methods for the rapid detect the presence genes, expression levels of the toxigenic and drug target genes in S. aureus and V. cholerae using PCR, sequencing and membrane array. The genes studied are SEA-SEJ (genes encoding S. aureus enterotoxins) ace, zot, ctxA, ctxB, toxR (toxigenic genes of V. cholerae) Sav1017 and AdaB (protein synthesis and DNA synthesis genes in S. aureus. These techniques were carried out step by step with primers designing, PCR amplification, sequencing and detection of expression by membrane array. These assays are extremely robust, sensitive, specific and economical and can be adapted to different throughputs. Thus, a rapid, sensitive and reliable technique for detecting toxigenic genes of S. aureus and V. cholerae was suc-cessfully developed.
  Zamberi Sekawi , Rusmah Yusof and Mariana Nor Shamsudin
  A study was conducted to portray a preliminary characteristic of extended-spectrum β-lactamases (ESBLs)-producing Escherichia coli in a local tertiary hospital in Malaysia. Sixteen clinical isolates of ESBLs producing E. coli from different sources were examined for blaSHV/TEM/CTX-M ESBL genes by PCR molecular assay. Each strain was found to carry at least one of the genes. This study demonstrated a high prevalence of blaCTX-M (81.3%) and blaTEM genes (75%). Only two strains (12.5%) carried the blaSHV gene. Nucleotide and deduced protein sequences determination showed; 61% produced CTX-M-15, 31% produced CTX-M-14 and 8% produced CTX-M-3. The antimicrobial susceptibility testing data determined that almost all sixteen isolates were resistant to oxyimino-cephalosporins, 46% resistant to gentamicin, 69% resistant to trimethoprim-sulfamethoxazole and 46% resistant to ciprofloxacin. This study preliminary emphasizes the epidemiology of the ESBL-producing E. coli particularly SHV, TEM and CTX-M-type producing E. coli in Malaysia.
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