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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Society for Biochemistry and Molecular Biology
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Volume & Issues
Volume 39, Issue 6 - Nov 2006
Volume 39, Issue 5 - Sep 2006
Volume 39, Issue 4 - Jul 2006
Volume 39, Issue 3 - May 2006
Volume 39, Issue 2 - Mar 2006
Volume 39, Issue 1 - Jan 2006
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Blood-neural Barrier: Intercellular Communication at Glio-Vascular Interface
Kim, Jeong-Hun ; Kim, Jin-Hyoung ; Park, Jeong-Ae ; Lee, Sae-Won ; Kim, Woo-Jean ; Yu, Young-Suk ; Kim, Kyu-Won ;
BMB Reports , volume 39, issue 4, 2006, Pages 339~345
DOI : 10.5483/BMBRep.2006.39.4.339
The blood-neural barrier (BNB), including blood-brain barrier (BBB) and blood-retinal barrier (BRB), is an endothelial barrier constructed by an extensive network of endothelial cells, astrocytes and neurons to form functional 'neurovascular units', which has an important role in maintaining a precisely regulated microenvironment for reliable neuronal activity. Although failure of the BNB may be a precipitating event or a consequence, the breakdown of BNB is closely related with the development and progression of CNS diseases. Therefore, BNB is most essential in the regulation of microenvironment of the CNS. The BNB is a selective diffusion barrier characterized by tight junctions between endothelial cells, lack of fenestrations, and specific BNB transporters. The BNB have been shown to be astrocyte dependent, for it is formed by the CNS capillary endothelial cells, surrounded by astrocytic end-foot processes. Given the anatomical associations with endothelial cells, it could be supposed that astrocytes play a role in the development, maintenance, and breakdown of the BNB. Therefore, astrocytes-endothelial cells interaction influences the BNB in both physiological and pathological conditions. If we better understand mutual interactions between astrocytes and endothelial cells, in the near future, we could provide a critical solution to the BNB problems and create new opportunities for future success of treating CNS diseases. Here, we focused astrocyte-endothelial cell interaction in the formation and function of the BNB.
Structural Conservation and Food Habit-related Liver Expression of Uncoupling Protein 2 Gene in Five Major Chinese Carps
Liao, Wan-Qin ; Liang, Xu-Fang ; Wang, Lin ; Fang, Ling ; Lin, Xiaotao ; Bai, Junjie ; Jian, Qing ;
BMB Reports , volume 39, issue 4, 2006, Pages 346~354
DOI : 10.5483/BMBRep.2006.39.4.346
The full-length cDNA of grass carp (Ctenopharyngodon idellus) and silver carp (Hypophthalmichthys molitrix) uncoupling protein 2 (UCP2) was obtained from liver. The grass carp UCP2 cDNA was determined to be 1152 bp in length with an open reading frame that encodes 310 amino acids. Five introns (Intron 3, 4, 5, 6 and 7) in the translated region, and partial sequence of Intron 2 in the untranslated region of grass carp UCP2 gene were also obtained. Gene structure comparison between grass carp and mammalian (human and mouse) UCP2 gene shows that, the UCP2 gene structure of grass carp is much similar to that of human and mouse. Partial UCP2 cDNA sequences of bighead carp (Aristichthys nobilis) and mud carp (Cirrhinus molitorella), were further determined. Together with the common carp (Cyprinus carpio) UCP2 sequence from GenBank (AJ243486), multiple alignment result shows that the nucleotide and amino acid sequences of the UCP2 gene, were highly conserved among the five major Chinese carps that belong to four subfamilies. Using beta-actin as control, the ratio UCP2/beta-actin mRNA (%) was determined to be
(bighead carp) and
(grass carp). The relative liver UCP2 expression of the five major Chinese carps, shows a close relationship with their food habit: benthos and detrituseating fish (common carp and mud carp) > planktivorious fish (silver carp and bighead carp) > herbivorious fish (grass carp). We suggest that liver UCP2 might be important for Chinese carps to detoxify cyanotoxins and bacteria in debris and plankton food.
The Potato Transcriptional Co-activator StMBF1 Is Up-regulated in Response to Oxidative Stress and Interacts with the TATA-box Binding Protein
Arce, Debora Pamela ; Tonon, Claudia ; Zanetti, Maria Eugenia ; Godoy, Andrea Veronica ; Hirose, Susumu ; Casalongue, Claudia Anahi ;
BMB Reports , volume 39, issue 4, 2006, Pages 355~360
DOI : 10.5483/BMBRep.2006.39.4.355
To gain a better understanding on the function of the potato Solanum tuberosum Multiprotein Bridging Factor 1 protein (StMBF1) its interaction with the TATA box binding protein (TBP) was demonstrated. In addition we reported that StMBF1 rescues the yeast mbf1 mutant phenotype, indicating its role as a plant co-activator. These data reinforce the hypothesis that MBF1 function is also conserved among non closely related plant species. In addition, measurement of StMBF1 protein level by Western blot using anti-StMBF1 antibodies indicated that the protein level increased upon
and heat shock treatments. However, the potato
-1,3-glucanase protein level was not changed under the same experimental conditions. These data indicate that StMBF1 participates in the cell stress response against oxidative stress allowing us to suggest that MBF1 genes from different plant groups may share similar functions.
Genetic Variation and Species Identification of Thai Boesenbergia (Zingiberaceae) Analyzed by Chloroplast DNA Polymorphism
Techaprasan, Jiranan ; Ngamriabsakul, Chatchai ; Klinbunga, Sirawut ; Chusacultanachai, Sudsanguan ; Jenjittikul, Thaya ;
BMB Reports , volume 39, issue 4, 2006, Pages 361~370
DOI : 10.5483/BMBRep.2006.39.4.361
Genetic variation and molecular phylogeny of 22 taxa representing 14 extant species and 3 unidentified taxa of Boesenbergia in Thailand and four outgroup species (Cornukaempferia aurantiflora, Hedychium biflorum, Kaempferia parviflora, and Scaphochlamys rubescens) were examined by sequencing of 3 chloroplast (cp) DNA regions (matK, psbA-trnH and petA-psbJ). Low interspecific genetic divergence (0.25-1.74%) were observed in these investigated taxa. The 50% majority-rule consensus tree constructed from combined chloroplast DNA sequences allocated Boesenbergia in this study into 3 different groups. Using psbA-1F/psbA-3R primers, an insertion of 491 bp was observed in B. petiolata. Restriction analysis of the amplicon (380-410 bp) from the remaining species with Rsa I further differentiated Boesenbergia to 2 groupings; I (B. basispicata, B. longiflora, B. longipes, B. plicata, B. pulcherrima, B. tenuispicata, B. thorelii, B. xiphostachya, Boesenbergia sp.1 and Boesenbergia sp.3; phylogenetic clade A) that possesses a Rsa I restriction site and II (B. curtisii, B. regalis, B. rotunda and Boesenbergia sp.2; phylogenetic clade B and B. siamensis; phylogenetic clade C) that lacks a restriction site of Rsa I. Single nucleotide polymorphism (SNP) and indels found can be unambiguously applied to authenticate specie-origin of all investigated samples and revealed that Boesenbergia sp.1, Boesenbergia sp.2 and B. pulcherrima (Mahidol University, Kanchanaburi), B. cf. pulcherrima1 (Prachuap Khiri Khan) and B. cf. pulcherrima2 (Thong Pha Phum, Kanchanaburi) are B. plicata, B. rotunda and B. pulcherrima, respectively. In addition, molecular data also suggested that Boesenbergia sp.3 should be further differentiated from B. longiflora and regarded as a newly unidentified Boesenbergia species.
Anti-CHH Antibody Causes Impaired Hyperglycemia in Penaeus monodon
Treerattrakool, Supattra ; Udomkit, Apinunt ; Panyim, Sakol ;
BMB Reports , volume 39, issue 4, 2006, Pages 371~376
DOI : 10.5483/BMBRep.2006.39.4.371
Crustacean hyperglycemic hormone (CHH) plays a major role in controlling glucose level in the haemolymph and also triggers important events during molting and reproductive cycles. In Penaeus monodon, three types of CHH, namely Pem-CHH1, Pem-CHH2 and Pem-CHH3, have been previously characterized. In this study, mouse polyclonal antibody was raised against recombinant Pem-CHH1 that was expressed in Escherichia coli. The anti-Pem-CHH1 antibody recognized all three types of Pem-CHHs but did not cross-react with either related hormone, molt-inhibiting hormone of P. monodon, or unrelated human growth hormone. The hyperglycemic activity in the extract from the eyestalk neural tissues was significantly depleted after incubating with anti-Pem-CHH antibody. Direct injection of the antibody into shrimp caused about 30-50% reduction in the haemolymph glucose level. The result demonstrates the ability of anti-Pem-CHH1 antibody to deplete the activity of CHH in vivo, and thus provides a possibility of using anti-Pem-CHH1 antibody to inhibit the hormone activity as a strategy to modulate growth and reproduction in this species.
Oxidative Stress Is Decreased in Off-pump Versus On-pump Coronary Artery Surgery
Gonenc, Aymelek ; Haclsevki, Aysun ; Bakkaloglu, Beyhan ; Soyaglr, Aylin ; Torun, Meral ; Karagoz, Haldun ; Simsek, Bolkan ;
BMB Reports , volume 39, issue 4, 2006, Pages 377~382
DOI : 10.5483/BMBRep.2006.39.4.377
Oxidative stress occurs in patients undergoing coronary artery bypass operation. The aim of this study was to investigate the difference in oxidative stress in off-pump versus on-pump coronary artery bypass surgery. In the present study, in serial blood samples, plasma malondialdehyde (MDA) as index of lipid peroxidation, red blood cells glutathione peroxidase (GPx) and superoxide dismutase (SOD) were measured to compare the extent of oxidative stress in 30 patients undergoing OPCAB (off-pump coronary artery bypass grafting), 12 patients undergoing CABG (on-pump coronary artery bypass grafting) and 18 healthy controls. In CABG group, MDA levels increased significantly from
before anesthesia and
after anesthesia to
after ischemia (p < 0.05). Similarly, SOD levels also elevated significantly from
Hb before anesthesia and
Hb anesthesia induction to
Hb after ischemia (p < 0.01, p < 0.01, respectively). In OPCAB group, only SOD levels increased from
Hb anesthesia induction to
Hb after reperfusion (p < 0.05). Glutathione peroxidase levels were not changed according to blood collection times in both of CABG group or OPCAB group (p > 0.05). Our results show that only mild signs of oxidative stress is found after reperfusion in OPCAB operation compared with CABG operation. Further studies are needed in order to confirm this hypothesis.
Characteristics of Thiamine Uptake by the BeWo Human Trophoblast Cell Line
Keating, Elisa ; Lemos, Clara ; Azevedo, Isabel ; Martel, Fatima ;
BMB Reports , volume 39, issue 4, 2006, Pages 383~393
DOI : 10.5483/BMBRep.2006.39.4.383
Little is known concerning the mechanisms responsible for the transplacental transfer of thiamine. So, the aim of this work was to characterize the placental uptake of thiamine from the maternal circulation, by determining the characteristics of
-thiamine uptake by a human trophoblast cell line (BeWo). Uptake of
-thiamine (50-100 nM) by BeWo cells was: 1) temperature-dependent and energy-independent; 2) pH-dependent (uptake increased as the extracellular medium pH decreased); 3)
-independent; 4) not inhibited by the thiamine structural analogs amprolium, oxythiamine and thiamine pyrophosphate; 5) inhibited by the unrelated organic cations guanidine, N-methylnicotinamide, tetraethylammonium, clonidine and cimetidine; 6) inhibited by the organic cation serotonin, and by two selective inhibitors of the serotonin plasmalemmal transporter (hSERT), fluoxetine and desipramine. We conclude that
-thiamine uptake by BeWo cells seems to occur through a process distinct from thiamine transporter-1 (hThTr-1) and thiamine transporter-2 (hThTr-2). Rather, it seems to involve hSERT. Moreover, chronic (48 h) exposure of cells to caffeine (
) stimulated and chronic exposure to xanthohumol and iso-xanthohumol (1 and
, respectively) inhibited
-thiamine uptake, these effects being not mediated through modulation of the expression levels of either hThTr-1 or hSERT mRNA.
Putrescine Transport in a Cyanobacterium Synechocystis sp. PCC 6803
Raksajit, Wuttinun ; Maenpaa, Pirkko ; Incharoensakdi, Aran ;
BMB Reports , volume 39, issue 4, 2006, Pages 394~399
DOI : 10.5483/BMBRep.2006.39.4.394
The transport of putrescine into a moderately salt tolerant cyanobacterium Synechocystis sp. PCC 6803 was characterized by measuring the uptake of radioactively-labeled putrescine. Putrescine transport showed saturation kinetics with an apparent
protein. The transport of putrescine was pH-dependent with highest activity at pH 7.0. Strong inhibition of putrescine transport was caused by spermine and spermidine whereas only slight inhibition was observed by the addition of various amino acids. These results suggest that the transport system in Synechocystis sp. PCC 6803 is highly specific for polyamines. Putrescine transport is energy-dependent as evidenced by the inhibition by various metabolic inhibitors and ionophores. Slow growth was observed in cells grown under salt stress. Addition of low concentration of putrescine could restore growth almost to the level observed in the absence of salt stress. Upshift of the external osmolality generated by either NaCl or sorbitol caused an increased putrescine transport with an optimum 2-fold increase at 20 mosmol/kg. The stimulation of putrescine transport mediated by osmotic upshift was abolished in chloramphenicol-treated cells, suggesting possible involvement of an inducible transport system.
Characterization of Late-Onset Citrullinemia 1 in a Korean Patient: Confirmation by Argininosuccinate Synthetase Gene Mutation Analysis
Kim, In-Suk ; Ki, Chang-Seok ; Kim, Jong-Won ; Lee, Mun-Hyang ; Jin, Dong-Kyu ; Lee, Soo-Youn ;
BMB Reports , volume 39, issue 4, 2006, Pages 400~405
DOI : 10.5483/BMBRep.2006.39.4.400
A 16-month old boy was referred to our hospital for evaluation of recurrent generalized tonic clonic seizures. Metabolic evaluation revealed significant hyperammonemia (
). Amino acid/acylcarnitine screening using tandem mass spectrometry showed markedly increased plasma levels of citrulline (
) with undetectable levels of arginine and arginosuccinic acid. Urinary excretion of citrulline was markedly increased (
creatinine). Brain MRI findings showed diffuse high-signal intensity lesions, that involved gray and white matter in both frontal lobes and insula with edematous changes; these findings were consistent with the acute stage of citrullinemia (CTLN). Mutation analysis of the argininosuccinate synthetase (ASS) gene, in this patient, showed a Gly324Ser mutation in exon 13, and a 67-bp duplication mutation in exon 15 (c.1128-6_1188dup67). The patient was confirmed as having late-onset CTLN1 and treated with anticonvulsants, lactulose enema, protein restricted diet and arginine. Here we describe a case of late-onset CTLN1 in a patient by biochemical analyses and ASS gene mutation confirmation. This is the first report of a Korean patient with late-onset CTLN1 confirmed by ASS gene mutation identification.
Identification of Amino Acid Residues Involved in the Interaction between Measles Virus Haemagglutin (MVH) and Its Human Cell Receptor(Signaling Lymphocyte Activation Molecule, SLAM)
Xu, Qin ; Zhang, Peng ; Hu, Chunling ; Liu, Xin ; Qi, Yipeng ; Liu, Yingle ;
BMB Reports , volume 39, issue 4, 2006, Pages 406~411
DOI : 10.5483/BMBRep.2006.39.4.406
Signaling lymphocyte activation molecule (SLAM; also known as CD150) is a newly identified cellular receptor for measles virus (MV). The interaction between MV Haemagglutin (MVH) and SLAM is an initial step for MV entry. We have identified several novel SLAM binding sites at residues S429, T436 and H437 of MVH protein and MVH mutants in these residues dramatically decrease the ability to interaction with the cell surface SLAM and fail to co-precipitation with SLAM in vivo as well as malfunction in syncytium formation. At the same time, K58, S59 and H61 of SLAM was also identified to be critical for MVH and SLAM binding. Further, these residues may be useful targets for the development of measles therapy.
Identification of Transmembrane Domain of a Membrane Associated Protein NS5 of Dendrolimus punctatus Cytoplasmic Polyhedrosis Virus
Chen, Wuguo ; Zhang, Jiamin ; Dong, Changjin ; Yang, Bo ; Li, Yanqiu ; Liu, Chuanfeng ; Hu, Yuanyang ;
BMB Reports , volume 39, issue 4, 2006, Pages 412~417
DOI : 10.5483/BMBRep.2006.39.4.412
We examined the intracellular localization of NS5 protein of Dendrolimus punctatus cytoplasmic polyhedrosis virus (DpCPV) by expressing NS5-GFP fusion protein and proteins from deletion mutants of NS5 in baculovirus recombinant infected insect Spodoptera frugiperda (Sf-9) cells. It was found that the NS5 protein was present at the plasma membrane of the cells, and that the N-terminal portion of the protein played a key role in the localization. A transmembrane region was identified to be present in the N-terminal portion of the protein, and the detailed transmembrane domain (SQIHMVWVKSGLVFF, 57-71aa) of N-terminal portion of NS5 was further determined, which was accorded with the predicted results, these findings suggested that NS5 might have an important function in viral life cycle.
Korean BAC Library Construction and Characterization of HLA-DRA, HLA-DRB3
Park, Mi-Hyun ; Lee, Hye-Ja ; Bok, Jeong ; Kim, Cheol-Hwan ; Hong, Seong-Tshool ; Park, Chan ; Kimm, Ku-Chan ; Oh, Berm-Seok ; Lee, Jong-Young ;
BMB Reports , volume 39, issue 4, 2006, Pages 418~425
DOI : 10.5483/BMBRep.2006.39.4.418
A human bacterial artificial chromosome (BAC) library was constructed with high molecular weight DNA extracted from the blood of a male Korean. This Korean BAC library contains 100,224 clones of insert size ranging from 70 to 150 kb, with an average size of 86 kb, corresponding to a 2.9-fold redundancy of the genome. The average insert size was determined from 288 randomly selected BAC clones that were well distributed among all the chromosomes. We developed a pooling system and three-step PCR screen for the Korean BAC library to isolate desired BAC clones, and we confirmed its utility using primer pairs designed for one of the clones. The Korean BAC library and screening pools will allow PCR-based screening of the Korean genome for any gene of interest. We also determined the allele types of HLA-DRA and HLA-DRB3 of clone KB55453, located in the HLA class II region on chromosome 6p21.3. The HLA-DRA and DRB3 genes in this clone were identified as the DRA*010202 and DRB3*01010201 types, respectively. The haplotype found in this library will provide useful information in future human disease studies.
Kinetic Properties of Extracted Lactate Dehydrogenase and Creatine Kinase from Mouse Embryonic Stem Cell- and Neonatal-derived Cardiomyocytes
Zonouzi, Roseata ; Ashtiani, Saeid Kazemi ; Hosseinkhani, Saman ; Baharvand, Hossein ;
BMB Reports , volume 39, issue 4, 2006, Pages 426~431
DOI : 10.5483/BMBRep.2006.39.4.426
Embryonic stem cells (ESCs), representing a population of undifferentiated pluripotent cells with both self-renewal and multilineage differentiation characteristics, are capable of spontaneous differentiation into cardiomyocytes. The present study sought to define the kinetic characterization of lactate dehydrogenase (LDH) and creatine kinase (CK) of ESC- and neonatal-derived cardiomyocytes. Spontaneously differentiated cardiomyocytes from embryoid bodies (EBs) derived from mouse ESC line (Royan B1) and neonatal cardiomyocytes were dispersed in a buffer solution. Enzymes were extracted by sonication and centrifugation for kinetic evaluation of LDH and CK with spectrophotometric methods. While a comparison between the kinetic properties of the LDH and CK of both groups revealed not only different Michaelis constants and optimum temperatures for LDH but also different Michaelis constants and optimum pH for CK, the pH profile of LDH and optimum temperature of CK were similar. In defining some kinetic properties of cardiac metabolic enzymes of ESC-derived cardiomyocytes, our results are expected to further facilitate the use of ESCs as an experimental model.
A Tuber Lectin from Arisaema jacquemontii Blume with Anti-insect and Anti-proliferative Properties
Kaur, Manpreet ; Singh, Kuljinder ; Rup, Pushpinder Jai ; Kamboj, Sukhdev Singh ; Saxena, Ajit Kumar ; Sharma, Madhunika ; Bhagat, Madhulika ; Sood, Sarvesh Kumar ; Singh, Jatinder ;
BMB Reports , volume 39, issue 4, 2006, Pages 432~440
DOI : 10.5483/BMBRep.2006.39.4.432
A tuber lectin from Arisaema jacquemontii Blume belonging to family Araceae was purified by employing a single step affinity chromatography using column of asialofetuin-linked amino activated silica beads and the bound lectin was eluted with 100 mM glycine-HCl buffer pH 2.5. The purified A. jacquemontii lectin (AJL) showed a single protein band with an apparent molecular mass of 13.4 kDa when submitted to SDS-polyacrylamide gel electrophoresis under reducing as well as non-reducing conditions. The native molecular mass of AJL determined by gel filtration on a Biogel P-200 column was 52 kDa and its carbohydrate content was estimated to be 3.40%. Thus AJL is a tetrameric glycoprotein. The purified lectin agglutinated erythrocytes from rabbit but not from human. Its activity was not inhibited by any of the mono- and disaccharides tested except N-acetyl-D-lactosamine having minimal inhibitory sugar concentration (MIC) 25 mM. Among the glycoproteins tested only asialofetuin was found to be inhibitory (MIC
). A single band was obtained in native PAGE at pH 4.5 while PAGE at pH 8.3 showed two bands. Isoelectric focusing of AJL gave multiple bands in the pI range of 4.6-5.5. When incorporated in artificial diet AJL significantly affected the development of Bactrocera cucurbitae (Coquillett) larvae indicating the possibility of using this lectin in a biotechnological strategy for insect management of cucurbits. Larvae fed on artificial diet containing sub-lethal dose of AJL showed a significant decrease in acid phosphatase and alkaline phosphatase activity while esterase activity markedly increased as compared to larvae fed on diet without lectin. Out of various human cancer cell lines employed in sulphorhodamine B (SRB) assay, this lectin was found to have appreciable inhibitory effect on the in vitro proliferation of HCT-15, HOP-62, SW-620, HT-29, IMR-32, SKOV-3, Colo-205, PC-3, HEP-2 and A-549 cancer cell lines by 82, 77, 73, 70, 41, 41, 37, 29, 21 and 21% respectively.
GEDA: New Knowledge Base of Gene Expression in Drug Addiction
Suh, Young-Ju ; Yang, Moon-Hee ; Yoon, Suk-Joon ; Park, Jong-Hoon ;
BMB Reports , volume 39, issue 4, 2006, Pages 441~447
DOI : 10.5483/BMBRep.2006.39.4.441
Abuse of drugs can elicit compulsive drug seeking behaviors upon repeated administration, and ultimately leads to the phenomenon of addiction. We developed a procedure for the standardization of microarray gene expression data of rat brain in drug addiction and stored them in a single integrated database system, focusing on more effective data processing and interpretation. Another characteristic of the present database is that it has a systematic flexibility for statistical analysis and linking with other databases. Basically, we adopt an intelligent SQL querying system, as the foundation of our DB, in order to set up an interactive module which can automatically read the raw gene expression data in the standardized format. We maximize the usability of this DB, helping users study significant gene expression and identify biological function of the genes through integrated up-to-date gene information such as GO annotation and metabolic pathway. For collecting the latest information of selected gene from the database, we also set up the local BLAST search engine and non-redundant sequence database updated by NCBI server on a daily basis. We find that the present database is a useful query interface and data-mining tool, specifically for finding out the genes related to drug addiction. We apply this system to the identification and characterization of methamphetamine-induced genes' behavior in rat brain.
Effective Chemopreventive Activity of Genistein against Human Breast Cancer Cells
Shon, Yun-Hee ; Park, Sun-Dong ; Nam, Kyung-Soo ;
BMB Reports , volume 39, issue 4, 2006, Pages 448~451
DOI : 10.5483/BMBRep.2006.39.4.448
Chemopreventive and cytotoxic effect of genistein against human breast cancer cell lines was investigated. Genistein inhibited cell proliferation in estrogen receptor-positive (MCF-7) and estrogen receptor-negative (MDA-MB-231) human breast carcinoma cell lines. Cytochrome P450 (CYP) 1A1-mediated ethoxyresorufin O-deethylase (EROD) activity was inhibited by genistein in a concentrationdependent manner. Genistein significantly inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced cyclooxy-genase-2 activity and protein expression at the concentrations of 10 (p < 0.05), 25 (p < 0.05) and 50 mM (p < 0.01). In addition, ornithine decarboxylase (ODC) activity was reduced to 53.8 % of the control after 6 h treatment with 50 mM genistein in MCF-7 breast cancer cells. These results suggest that genistein could be of therapeutic value in preventing human breast cancer.
Oxidative Damage of DNA Induced by the Cytochrome c and Hydrogen Peroxide System
Kim, Nam-Hoon ; Kang, Jung-Hoon ;
BMB Reports , volume 39, issue 4, 2006, Pages 452~456
DOI : 10.5483/BMBRep.2006.39.4.452
To elaborate the peroxidase activity of cytochrome c in the generation of free radicals from
, the mechanism of DNA cleavage mediated by the cytochrome c/
system was investigated. When plasmid DNA was incubated with cytochrome c and
, the cleavage of DNA was proportional to the cytochrome c and
concentrations. Radical scavengers, such as azide, mannitol, and ethanol, significantly inhibited the cytochrome c/
system-mediated DNA cleavage. These results indicated that free radicals might participate in the DNA cleavage by the cytochrome c and
system. Incubation of cytochrome c with
resulted in a time-dependent release of iron ions from the cytochrome c molecule. During the incubation of deoxyribose with cytochrome c and
, the damage to deoxyribose increased in a time-dependent manner, suggesting that the released iron ions may participate in a Fenton-like reaction to produce
OH radicals that may cause the DNA cleavage. Evidence that the iron-specific chelator, desferoxamine (DFX), prevented the DNA cleavage induced by the cytochrome c/
system supports this mechanism. Thus we suggest that DNA cleavage is mediated via the generation of
OH by a combination of the peroxidase reaction of cytochrome c and the Fenton-like reaction of free iron ions released from oxidatively damaged cytochrome c in the cytochrome c/
Insulin Resistance Does Not Influence Gene Expression in Skeletal Muscle
Nguyen, Lisa L. ; Kriketos, Adamandia D. ; Hancock, Dale P. ; Caterson, Ian D. ; Denyer, Gareth S. ;
BMB Reports , volume 39, issue 4, 2006, Pages 457~463
DOI : 10.5483/BMBRep.2006.39.4.457
Insulin resistance is commonly observed in patients prior to the development of type 2 diabetes and may predict the onset of the disease. We tested the hypothesis that impairment in insulin stimulated glucose-disposal in insulin resistant patients would be reflected in the gene expression profile of skeletal muscle. We performed gene expression profiling on skeletal muscle of insulin resistant and insulin sensitive subjects using microarrays. Microarray analysis of 19,000 genes in skeletal muscle did not display a significant difference between insulin resistant and insulin sensitive muscle. This was confirmed with real-time PCR. Our results suggest that insulin resistance is not reflected by changes in the gene expression profile in skeletal muscle.
One Step Cloning of Defined DNA Fragments from Large Genomic Clones
Scholz, Christian ; Doderlein, Gabriele ; Simon, Horst H. ;
BMB Reports , volume 39, issue 4, 2006, Pages 464~467
DOI : 10.5483/BMBRep.2006.39.4.464
Recently, the nucleotide sequences of entire genomes became available. This information combined with older sequencing data discloses the exact chromosomal location of millions of nucleotide markers stored in the databases at NCBI, EMBO or DDBJ. Despite having resolved the intron/exon structures of all described genes within these genomes with a stroke of a pen, the sequencing data opens up other interesting possibilities. For example, the genomic mapping of the end sequences of the human, murine and rat BAC libraries generated at The Institute for Genomic Research (TIGR), reveals now the entire encompassed sequence of the inserts for more than a million of these clones. Since these clones are individually stored, they are now an invaluable source for experiments which depend on genomic DNA. Isolation of smaller fragments from such clones with standard methods is a time consuming process. We describe here a reliable one-step cloning technique to obtain a DNA fragment with a defined size and sequence from larger genomic clones in less than 48 hours using a standard vector with a multiple cloning site, and common restriction enzymes and equipment. The only prerequisites are the sequences of ends of the insert and of the underlying genome.