• The Plant Pathology Journal
• /
• v.30 no.4
• /
• pp.343-354
• /
• 2014

Rice blast disease caused by Magnaporthe oryzae is one of the most serious diseases of cultivated rice (Oryza sativa L.) in most rice-growing regions of the world. In order to investigate early response genes in rice, we utilized the transcriptome analysis approach using a 300 K tilling microarray to rice leaves infected with compatible and incompatible M. oryzae strains. Prior to the microarray experiment, total RNA was validated by measuring the differential expression of rice defense-related marker genes (chitinase 2, barwin, PBZ1, and PR-10) by RT-PCR, and phytoalexins (sakuranetin and momilactone A) with HPLC. Microarray analysis revealed that 231 genes were up-regulated (>2 fold change, p < 0.05) in the incompatible interaction compared to the compatible one. Highly expressed genes were functionally characterized into metabolic processes and oxidation-reduction categories. The oxidative stress response was induced in both early and later infection stages. Biotic stress overview from MapMan analysis revealed that the phytohormone ethylene as well as signaling molecules jasmonic acid and salicylic acid is important for defense gene regulation. WRKY and Myb transcription factors were also involved in signal transduction processes. Additionally, receptor-like kinases were more likely associated with the defense response, and their expression patterns were validated by RT-PCR. Our results suggest that candidate genes, including receptor-like protein kinases, may play a key role in disease resistance against M. oryzae attack.

• Clinical and Experimental Pediatrics
• /
• v.46 no.2
• /
• pp.143-153
• /
• 2003

Purpose : Infection with Shiga-like toxin (SLT)-producing Escherichia coli, an emerging human pathogen found particularly in young children under 5 years of age, causes a spectrum of illnesses with high morbidity and mortality, ranging from diarrhea to hemorrhagic colitis and hemolytic uremic syndrome. Host mediators play an important role in the pathogenesis of SLT-I toxicity. The experiments described here were designed to investigate the effect of SLT-I on TNF-${\alpha}$ production and to understand the effect of TNF-${\alpha}$ on GB3 expression. We also further examine the relationship between the Gb3 level and the differential susceptibility of cells to the cytotoxic action of SLT-I. Methods : The effect of purified SLT-1 from E. coli O157 : H7 (ATCC 43890) on tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) production in Raw264.7 cells was investigated. Many mediators regulate endothelial cell membrane expression of the glycolipid globotriaosyleramide (Gb3), which serves as the toxin receptor, suggesting that the host response to the toxin or other bacterial products may contribute to pathogenesis by regulating target cell sensitivity to the toxins. Therefore, the relationships between Gb3 expression and cytotoxicity against SLT-I on three types of cells were evaluated. Results : Detectable levels of TNF-${\alpha}$ were produced as early as six hours after induction and continued to increase during 48 hours by SLT-I. It was also found that Vero cells and dendritic cells (DC2.4 cells) expressed high levels of Gb3, 83% and 68%, respectively, and that Raw264.7 cells had a low level of Gb3 (29%) and appeared refractory to cytotoxicity against SLT-I. Vero cells and DC2.4 cells expressing high levels of Gb3 were highly susceptible to SLT-I. Furthermore, macrophages showed a resistance to SLT-I cytotoxicity, despite the fact that Gb3 expression was enhanced. Conclusion : These results strongly suggest that the expression of Gb3 is necessary but not sufficient to confer sensitivity of macrophages to SLT-I and further underpin the important role of SLT-I and its Gb3 receptors in the pathogenesis of E. coli O157 infection.

• The Plant Pathology Journal
• /
• v.21 no.2
• /
• pp.149-157
• /
• 2005

A novel rice (Oryza sativa L.) gene, homologous to Arabidopsis pathogenesis-related NDR1 gene, was cloned from cDNA library prepared from 30 min Magnaporthe grisea -treated rice seedling leaves, and named as OsNDR1. OsNDR1 encoded a 220-aminoacid polypeptide and was highly similar to the Arabidopsis AtNDR1 protein. OsNDR1 is a plasma membrane (PM)-localized protein, and presumes through sequence analysis and protein localization experiment. Overexpression of OsNDR1 promotes the expression of PBZ1 that is essential for the activation of defense/stressrelated gene. The OsNDR1 promoter did not respond significantly to treatments with either SA, PBZ, or ETP. Exogenously applied BTH induces the same set of SAR genes as biological induction, providing further evidence for BTH as a signal. Presumably, BTH is bound by a receptor and the binding triggers a signal transduction cascade that has an ultimate effect on transcription factors that regulate SAR gene expression. Thus OsNDR1 may act as a transducer of pathogen signals and/or interact with the pathogen and is indeed another important step in clarifying the component participating in the defense response pathways in rice.

• The Journal of Korean Medical History
• /
• v.24 no.1
• /
• pp.97-110
• /
• 2011

Rhinitis, inflammation of the nasal cavity caused by the disease in our country that a recent trend is the rapidly increasing number of patients. It causes multiple complications and interfere with daily life and social life in case of being viewed as a mild cold. The rhinitis treatment for symptomatic therapy in modern medicine is staying because the situation is exposing the limitations. so traditional medicine is trying to find a solution but that is not easy. In modern medicine, rhinitis is defined as a set of histological lesions and clinical symptoms, but traditional medicine has developed in dealing with each symptoms in disease. The treatment that doesn't distinguish any treatment in growing numbers of patients does not seem to validate, because doctors treat without considering the difference of recognition. Looking at the symptoms for each, I found that each symptoms and causes are varied according to doctors and era. In spite of considering all of that in treatment, it was ignored or underestimated in modern medicine. Furthermore, in traditional medicine, they just conjugated certain period theory and only had limited treatment by a lack of integrated awareness about definition and mechanism. In addition, in case of mentioning about the causes of prescription in each medical books, there were not enough explain about pathological states. Therefore, these causes should be made to further the research about the validity, pathogenesis and treatment. We can see that theory could be established and modified by the accumulation of clinical experience, observations through classification by each of the causes, prescription and treatment. In traditional medicine simply does not pay attention only to nasal inflammation, such as the impact of Meridian and organs considered to have focused on the fundamental treatment. This increased immune resistance to the modern rhinitis patients may offer new therapeutic approaches. I hope this paper would be helpful to find the treatment with uncovered theory in modern medicine.

• The Journal of Pediatrics of Korean Medicine
• /
• v.18 no.1
• /
• pp.273-288
• /
• 2004

Objective: The purpose of this study was to investigate the oriental cause and treatment of the polyhidrosis of hands and feet. Methods: It was studied 47 kinds of Oriental Medical literature for polyhidrosis of hands and feet Results: Polyhidrosis of hands and feet due to lowered superficial resistance brought on by deficiency of qi. Main pathogenesis(病因病機) is the heat in the middle energizer(中焦熱) such as heat in the stomach(胃熱) and the spleen and stomach heat stagnation(脾胃積熱), deficient in Yin and Yang, qi and blood(陰陽氣血), and retention of undigested food(食積) due to improper diet(飮食不能). Treating method(治法) is eliminating dampness and regulating the stomach(淸熱燥瀑和中), invigorating, replenishing spleen qi(補益脾氣), and nourishing the stomach Yin(滋養胃陰). Treating prescription(治方) is presented as Palmultang with Additional Ingredients Rhi.zoma Pinelliae, Pona for principle drug Rhi.zorm Typfwnii Radix Aconiti for adjuvant and messenger drug(八物湯加半夏 茯笭君 白附子 川烏爲在使), Daeshihotang(大柴胡湯), Cheongbisan(淸脾散), Moryeosan(牡蠣散) etc. The external treatments(外用法) are described as ways of washing hand and foot after steaming with boiled Decoction(牡蠣散) of AJurnen(白礬); Radix Puerariae(乾葛), Radix Astragali(黃?); Radix Puerariae(乾葛), Herba Schiwnepetae(荊芥); Radix Saposhnikoviae (防風), 白礬(AIumen). The acupuncture recipes (鍼治療法) are the toninfication(補) of Buryu(KI 7)(復溜) ; Eumgeuk(HT 6)(陰?), tonification(補) methods of Buryu(KI 7)(復溜) ; Gihae(CC 6)(氣海) and reduction(潟) of Hapgok(LI 4)(合谷), the reduction(潟) of Hapgok(LI 4)(合谷), tonification of Buryu(Kl 7)(復溜), reduction(潟) of Jigu(TE 6)(支溝) ; Taechung(LR 3)(太衝) ; Yangneungcheon (GB 34)(陽陸泉). and selection of points of Hapgok(Li 4) (合谷) and Nogung(PC 8)(勞宮). The Tui-na therapies (推拿療法) are removing heat from the stomach meridian(淸胃經O) and so on.

• The Plant Pathology Journal
• /
• v.24 no.4
• /
• pp.375-383
• /
• 2008

It is well known that NtMEK2, a tobacco MAPK kinase, is the upstream kinase of both salicylic acid-induced protein kinase and wound-induced protein kinase. In addition, expression of $NtMEK2^{DD}$, a constitutively active mutant of NtMEK2, is known to induce multiple defense responses in tobacco. In this study, transgenic rice plants that contained an active or inactive mutant of NtMEK2 under the control of a steroid inducible promoter were generated and used to determine if a similar MAPK cascade is involved in disease resistance in rice. The expression of $NtMEK2^{DD}$ in transgenic rice plants resulted in HR-like cell death. The observed cell death was preceded by the activation of endogenous rice 48-kDa MBP kinase, which is also activated by Xanthomonas oryzae pv. oryzae, the bacterial blight pathogen of rice. In addition, prolonged activation of the MAPK induced the generation of hydrogen peroxide and up-regulated the expression of defense-related genes including the pathogenesis-related genes, peroxidases and glutathione S-transferases. These results demonstrate that NtMEK2 is functionally replaceable with rice MAPK kinase in inducing the activation of the downstream MAPK, which in turn induces multiple defense responses in rice.

• Journal of Microbiology and Biotechnology
• /
• v.15 no.5
• /
• pp.1073-1079
• /
• 2005

To investigate plant protection, pathogenesis-related (PR) proteins and plant defense enzymes related to cell wall lignification were studied in pepper plants inoculated with antagonistic Bacillus subtilis HJ927 and pathogenic strain Phytophthora capsici. Phytophthora blight disease was reduced by $53\%$ in pepper roots when preinoculated with B. subtilis HJ927 against P. capsici. The activities of PR proteins (chitinase and ${\beta}$-1,3,-glucanase) and defense-related enzymes (peroxidase, polyphenoloxidase, and phenylalanine ammonia lyase) decreased in roots of B. subtilis+P capsid-treated plants, but increased in leaves with time. The decrease and increase were much greater in P. capsici-treated plants than in B. subtilis HJ927+P capsici-treated plants, although P. capsici-treated plants had more severe damage. Therefore, changes of enzyme activities do not seem to be directly related to plant protection. We suggest that the change of these enzymes in pathogen-treated plants may be related to plant response rather than to resistance against pathogen attacks.

• Journal of Microbiology and Biotechnology
• /
• v.19 no.2
• /
• pp.194-203
• /
• 2009

$HpaG_{Xooc}$, from rice pathogenic bacterium Xanthomonas oryzae pv. oryzicola, is a member of the harpin group of proteins, eliciting hypersensitive cell death in non-host plants, inducing disease and insect resistance in plants, and enhancing plant growth. To express and secret the $HpaG_{Xooc}$ protein in Bacillus subtilis, we constructed a recombinant expression vector pM43HF with stronger promoter P43 and signal peptide element nprB. The SDS-PAGE and Western blot analysis demonstrated the expression of the protein $HpaG_{Xooc}$ in B. subtilis. The ELISA analysis determined the optimum condition for $HpaG_{Xooc}$ expression in B. subtilis WBHF. The biological function analysis indicated that the protein $HpaG_{Xooc}$ from B. subtilis WBHF elicits hypersensitive response(HR) and enhances the growth of tobacco. The results of RT-PCR analysis revealed that $HpaG_{Xooc}$ induces expression of the pathogenesis-related genes PR-1a and PR-1b in plant defense response.

• Journal of Microbiology and Biotechnology
• /
• v.23 no.11
• /
• pp.1493-1499
• /
• 2013

A novel radiation-resistant Filobasidium sp. yeast strain was isolated from seawater. Along with this strain, a total of 656 yeast isolates were purified from seawater samples collected from three locations in the West Sea of Korea and assessed for their radiation tolerance. Among these isolates, five were found to survive a 5 kGy radiation dose. The most radiation-resistant strain was classified as Filobasidium sp. based on 18S rDNA sequence analysis and hence was named Filobasidium RRY1 (Radiation-Resistant Yeast 1). RRY1 differed from F. elegans, which is closely related to RRY1, in terms of the optimal growth temperature and radiation resistance, and was resistant to high doses of ${\gamma}$-ionizing radiation ($D_{10}$: 6-7 kGy). When exposed to a high dose of 3 kGy irradiation, the RRY1 cells remained intact and undistorted, with negligible cell death. When these irradiated cells were allowed to recover, the cells fully repaired their genomic DNA within 3 h of growth recovery. This is the first report in which a radiation-resistant response has been investigated at the physiological, morphological, and molecular levels in a strain of Filobasidium sp.

• Asian Pacific Journal of Cancer Prevention
• /
• v.17 no.3
• /
• pp.1009-1014
• /
• 2016

It is not clear how gene polymorphisms affecting drugs can contributes totheir efficacy in multiple myeloma (MM). We here aimed to explore associations among gene polymorphisms of tumor necrosis factor alpha (TNFalpha), nitric oxide synthesis 3 (NOS3) and multi-drug resistance 1 (MDR1), clinical parameters, prognosis and survival in MM patients treated with VAD (vincristine-adriamycine-dexamethasone), MP (mephalane-prednisolone), autolougus stem cell transplantation (ASCT), BODEC (bortezomib-dexamethasone-cyclophosphamide) and TD (thalidomide-dexamethasone). We analyzed TNFalpha, NOS 3 and MDR1 in 77 patients with MM and 77 healthy controls. The genotyping was performed with PCR and/or PCR-RFLP. There was no clinically significant difference between MM and control groups when TNFalpha (-238) and (-857) and MDR1 gene polymorphisms were studied. However, the TNFalpha gene polymorphism (-308) GG genotype (p=0.012) and NOS3 (+894) TT genotype (p=0.008) were more common in the MM group compared to healthy controls. NOS3 (VNTR) AA (p=0.007) and NOS3 (+894) GG genotypes (p=0.004) were decreased in the MM group in contrast. In conclusion, the NOS3 (+894) TT and TNFalpha (-308) GG genotypes may have roles in myeloma pathogenesis.