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71.
72.
Hyo-Soon Jeong Seung Hoon Lee Hye-Young Yun Kwang Jin Baek Nyoun Soo Kwon Kyoung-Chan Park Dong-Seok Kim 《Journal of biomedical science》2011,18(1):55
Background
Sphingosylphosphorylcholine (SPC) acts as a potent lipid mediator and signaling molecule in various cell types. In the present study, we investigated the effects of SPC on melanogenesis and SPC-modulated signaling pathways related to melanin synthesis. 相似文献73.
Soon-Il Kim Je-Won Jung Young-Joon Ahn Linda L. Restifo Hyung-Wook Kwon 《Journal of Asia》2011,14(4):509-517
The fruit fly, Drosophila melanogaster, has been intensively used as a genetic model system for basic and applied research on human neurological diseases because of advantages over mammalian model systems such as ease of laboratory maintenance and genetic manipulations. Disease-associated gene mutations, whether endogenous or transgenically-inserted, often cause phenotypes in vivo that are similar to the clinical features of the human disorder. The Drosophila genome is simpler than that of mammals, in terms of gene and chromosome number, but nonetheless demonstrates extraordinary phylogenetic conservation of gene structure and function, especially notable among the genes whose mutations cause neurodevelopmental, neuropsychiatric, or neurodegenerative disorders. In addition, its well-established neuroanatomical, developmental, and molecular genetic research techniques allow many laboratories worldwide to study complex biological and genetic processes. Based on these merits of the Drosophila model system, it has been used for screening lifespan expansion and neuroprotective activities of plant extracts or their secondary metabolites to counteract pathological events such as mitochondrial damage by oxidative stress, which may cause sporadic neurodegenerative diseases. In this review, we have summarized that the fruit fly can be used for early-stage drug discovery and development to identify novel plant-derived compounds to protect against neurodegeneration in Alzheimer's disease and Parkinson's disease, and other neurological disorders caused by oxidative stress. Thus, the Drosophila system can directly or indirectly contribute to translational research for new therapeutic strategies to prevent or ameliorate neurodegenerative diseases. 相似文献
74.
75.
Myung-Soon Yang Jin-Su Hong Seong-Tae Kim Ki-Young Lee Kye Won Park Suk-Tae Kwon Dae-Hyuk Kweon Young Ho Koh Nicholas Gaiano Keejung Yoon 《Biochemical and biophysical research communications》2011,(1):133
Notch signaling pathway enhances neural stem cell characters and regulates cell fate decisions during neural development. Interestingly, besides Notch, other γ-secretase substrates such as APP, LRP2, and ErbB4 have also proven to have biological functions in neural development. We designed a unique experimental setting, combining gain-of- (expression of Notch intracellular domain, NICD) and loss-of-function (γ-secretase inhibition) methods, and were able to examine the function of Notch alone by excluding the activity of other γ-secretase substrates. Here, we show that the frequency and size of neurospheres generated from embryonic neural stem cells (NSCs) significantly decreased by 62.7% and 37.2%, respectively, in the presence of γ-secretase inhibitor even when NICD was expressed. Under the condition of differentiation, however, the γ-secretase inhibitor treatment did not influence the promotion of astrogenesis at the expense of neurogenesis by NICD. These results indicate that other γ-secretase substrate(s) along with Notch are important in the maintenance of the stemness of NSCs, but that Notch alone can sufficiently inhibit neurogenesis without the action of the other γ-secretase substrates during differentiation. 相似文献
76.
Production of nattokinase by high cell density fed-batch culture of Bacillus subtilis 总被引:1,自引:0,他引:1
Bacillus subtilis was cultivated to high cell density for nattokinase production by pH-stat fed-batch culture. A concentrated mixture solution
of glucose and peptone was automatically added by acid-supplying pump when culture pH rose above high limit. Effect of the
ratio of glucose to peptone in feeding solution was investigated on cell growth and nattokinase production by changing the
ratio from 0.2 to 5 g glucose/g peptone. The highest cell concentration was 77 g/L when the ratio was 0.2 g glucose/g peptone.
Cell concentration decreased with increasing the ratio of glucose to peptone in feeding solution, while the optimum condition
existed for nattokinase production. The highest nattokinase activity was 14,500 unit/mL at a ratio of 0.33 g glucose/g peptone,
which was 4.3 times higher than that in batch culture. 相似文献
77.
Meir Israelowitz Jeong-Ah Kwon Syed W. H. Rizvi Christoph Gille Herb P. von Schroeder 《仿生工程学报(英文版)》2011,8(2):129-139
The Melanophila acuminata beetle is attracted to forest fires via a pair of infrared sensory organs composed of sensilla. Our histological work showed that each sensillum contains lipid layers surrounding a protein layer and a unique polysaccharide base that is associated with a neuron to each sensillum. Infrared microscopy showed that the protein region maximally absorbs infrared radiation at 3 μm wavelength and at 10 μm, which corresponds to the known radiation produced by forest fires at 3 μm.Mathematical calculations showed that the physical properties of the sensilla are such that the expected temperature rise is insufficient for transduction of the infrared signal through mechanical means or as a thermal receptor as previously thought;hence the protein plays the pivotal role in perception of single photons and transmission of the signal within the sensilla. 相似文献
78.
79.
Moongeun Yoon Keun-Yong Kim In-Chul Bang Yoon Kwon Nam Dong Soo Kim 《Genes & genomics.》2011,33(3):307-312
Chinese medaka Oryzias sinensis (Teleostei: Beloniformes) is distributed in China and the western areas of Korea. It differs from the Japanese medaka O. latipes in its morphology and biogeographical distribution in Korea. In this study, we analyzed the complete nucleotide sequence of the mitochondrial genome (mitogenome) of O. sinensis and determined its genomic structure. The complete mitogenome is a circular molecule of 16,654 bp and its structural organization is conserved across diverse vertebrate taxa. On a phylogenetic tree inferred from the nucleotide matrix, partitioned into four regions (i.e., the first and second codon positions of protein-coding genes, and the ribosomal RNA and transfer RNA genes), O. sinensis clustered consistently with O. latipes specimens from China and Korea, with a relatively short branch length, but was separated from O. latipes specimen from Japan. Our findings will allow the resolution of the taxonomic problems of closely related Oryzias species, such as O. sinensis and O. latipes in a future study. 相似文献
80.
Eun-Young Yun Sung-Wan Kim Jae-Sam Hwang Young-Il Yoon O.-Yu Kwon Tae-Won Goo 《Genes & genomics.》2011,33(2):119-126
The baculovirus expression vector system (BEVS) is one of the powerful insect cell systems for heterologous protein expression. However, over-expression of heterologous proteins in this system sometimes results in protein misfolding and aggregation because of insufficient levels of folding catalysts. In previous study using the differential screening (DS) method, we isolated only 40 differentially expressed genes after treatment with tunicamycin, an unfolded protein response (UPR) inducer. To isolate more protein folding catalysts from insect, we performed suppressive subtractive hybridization (SSH) with untreated and tunicamycin-treated Bm5 cell lines in this study. We could isolate 366 differentially expressed clones by SSH method and produced expressed sequence tags (ESTs). ESTs included the UPR pathway-related genes involved in protein folding, including heat shock proteins, molecular chaperones, foldases, as well as glycosylation and secretory pathway related genes. Identification of the tunicamycin responsive genes using SSH provides more information about the UPR-related genes in insect cells, and will facilitate modifications of the protein folding pathway in the ER to improve heterologous protein expression. 相似文献