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91.
Fei Yi Jing Qu Mo Li Keiichiro Suzuki Na Young Kim Guang-Hui Liu Juan Carlos Izpisua Belmonte 《蛋白质与细胞》2012,3(11):855
The combination of disease-specific human induced pluripotent stem cells (iPSC) and directed cell differentiation offers an ideal platform for modeling and studying many inherited human diseases. Wilson’s disease (WD) is a monogenic disorder of toxic copper accumulation caused by pathologic mutations of the ATP7B gene. WD affects multiple organs with primary manifestations in the liver and central nervous system (CNS). In order to better investigate the cellular pathogenesis of WD and to develop novel therapies against various WD syndromes, we sought to establish a comprehensive platform to differentiate WD patient iPSC into both hepatic and neural lineages. Here we report the generation of patient iPSC bearing a Caucasian population hotspot mutation of ATP7B. Combining with directed cell differentiation strategies, we successfully differentiated WD iPSC into hepatocyte-like cells, neural stem cells and neurons. Gene expression analysis and cDNA sequencing confirmed the expression of the mutant ATP7B gene in all differentiated cells. Hence we established a platform for studying both hepatic and neural abnormalities of WD, which may provide a new tool for tissue-specific disease modeling and drug screening in the future. 相似文献
92.
93.
Keiichiro Matsukura Kazuhiro Yoshida Masaya Matsumura 《Applied Entomology and Zoology》2011,46(4):585-591
The monitoring of insect pests in fields of forage maize is difficult because plants are tall and grow at a high density.
We investigated the effectiveness of colored sticky traps and appropriate conditions for monitoring insect pests in forage
maize fields. Large numbers of the maize orange leafhopper, Cicadulina bipunctata Melichar (Hemiptera: Cicadellidae), and the small brown planthopper, Laodelphax striatellus Fallen (Hemiptera: Delphacidae), were collected during the experimental period with yellow and blue sticky traps placed in
summer crop forage maize fields. A greater number of insects were trapped in yellow traps relative to blue traps. Traps located
at a lower height (40 cm above the ground) attracted larger numbers of C. bipunctata, whereas L. striatellus did not demonstrate a height-dependent preference. These results indicated that yellow-colored sticky traps located at low
height are effective for collecting C. bipunctata and L. striatellus simultaneously. Seasonal occurrence data obtained by the yellow sticky traps showed clearer seasonal occurrences than that
obtained by two previously developed methods, suction and light traps, indicating that sticky traps are effective for monitoring
the seasonal occurrence of these two insects in forage maize fields. 相似文献
94.
The response of large calanoid, Eucalanus bungii, to environmental fluctuation, particularly in relation to the spring diatom bloom in the Oyashio region, western subarctic
Pacific Ocean, was examined by investigating egg production, grazing, development and starvation tolerance. Mean in situ egg
production rate increased with ambient chlorophyll-a concentration, ranging from 0 to 47 eggs female−1 d−1, while no diurnal synchronous spawning behavior was observed. Under the spring bloom condition, E. bungii showed prey preference for less mobile and larger-sized prey (≥30 μm ESD) and bloom-forming diatom Thalassiosira spp. accounted for >80% of ingested carbon. In the laboratory, E. bungii was successfully reared from newly hatched nauplii to adult with the diatom, Thalassiosira
nordenskioldi, as a food resource. Nauplii newly hatched from eggs reached the adult stage in ca. 150 days (5°C) with a sigmoidal developmental
pattern and no sexual difference in development pattern. Starvation experiments indicated that the starved copepodids (C1–C4)
became more vulnerable to high temperature with the progression of developmental stage, suggesting that the post-bloom condition
with low food availability and increased temperature is harsh for their copepodids. The results of this study in conjunction
with previous findings suggest that E. bungii is well adapted to utilize large-sized phytoplankton, such as a bloom-forming diatoms and, therefore, their recruitment processes,
including egg production, development and mortality would be strongly affected by the duration and intensity of the spring
bloom. 相似文献
95.
96.
Gambierol is a polycyclic ether toxin, isolated as a toxic constituent from the marine dinoflagellate Gambierdiscus toxicus. We describe here the synthesis and biological evaluation of structural analogues of gambierol. The present preliminary structure-activity relationship studies clearly indicate that the H ring functionality and the unsaturated side chain of gambierol are crucial for its potent toxicity. 相似文献
97.
Tomoyuki Mukai Richard Gallant Shu Ishida Teruhito Yoshitaka Mizuho Kittaka Keiichiro Nishida David A. Fox Yoshitaka Morita Yasuyoshi Ueki 《PloS one》2014,9(8)
Objective
SH3BP2 is a signaling adapter protein which regulates immune and skeletal systems. Gain-of-function mutations in SH3BP2 cause cherubism, characterized by jawbone destruction. This study was aimed to examine the role of SH3BP2 in inflammatory bone loss using a collagen-induced arthritis (CIA) model.Methods
CIA was induced in wild-type (Sh3bp2+/+) and heterozygous P416R SH3BP2 cherubism mutant knock-in (Sh3bp2KI/+) mice, an SH3BP2 gain-of-function model. Severity of the arthritis was determined by assessing the paw swelling and histological analyses of the joints. Micro-CT analysis was used to determine the levels of bone loss. Inflammation and osteoclastogenesis in the joints were evaluated by quantitating the gene expression of inflammatory cytokines and osteoclast markers. Furthermore, involvement of the T- and B-cell responses was determined by draining lymph node cell culture and measurement of the serum anti-mouse type II collagen antibody levels, respectively. Finally, roles of the SH3BP2 mutation in macrophage activation and osteoclastogenesis were determined by evaluating the TNF-α production levels and osteoclast formation in bone marrow-derived M-CSF-dependent macrophage (BMM) cultures.Results
Sh3bp2KI/+ mice exhibited more severe inflammation and bone loss, accompanying an increased number of osteoclasts. The mRNA levels for TNF-α and osteoclast marker genes were higher in the joints of Sh3bp2KI/+ mice. Lymph node cell culture showed that lymphocyte proliferation and IFN-γ and IL-17 production were comparable between Sh3bp2+/+ and Sh3bp2KI/+ cells. Serum anti-type II collagen antibody levels were comparable between Sh3bp2+/+ and Sh3bp2KI/+ mice. In vitro experiments showed that TNF-α production in Sh3bp2KI/+ BMMs is elevated compared with Sh3bp2+/+ BMMs and that RANKL-induced osteoclastogenesis is enhanced in Sh3bp2KI/+ BMMs associated with increased NFATc1 nuclear localization.Conclusion
Gain-of-function of SH3BP2 augments inflammation and bone loss in the CIA model through increased macrophage activation and osteoclast formation. Therefore, modulation of the SH3BP2 expression may have therapeutic potential for the treatment of rheumatoid arthritis. 相似文献98.
Keiichiro Morisawa Tetsuro Sugisaki Tomoyuki Kanamatsu Tsugutoshi Aoki Dr. Tetsuya Noguchi 《Neurochemical research》1989,14(2):173-177
We attempted to delineate the events leading to hypomyelination in the brain of thelittle mouse, a promising murine model of isolated growth hormone deficiency. At 20 days of age, the mutant mouse brain weighed less than its normal counterpart, and this difference in brain weight persisted. Increase in CNPase activity was found to be suppressed in the cerebrum throughout the developmental stage, but not in the other parts of the brain. Differences in cerebral DNA content between thelittle and normal mice first became apparent on the 10th day of age. Thereafter, the rate of increase in thelittle brain consistently lagged behind the normal. [3H]Thymidine incorporation into the DNA fraction in vivo on the 7th day of age, when glial cell proliferation in the normal cerebrum is most active, was approximately half that of the controls in all parts of thelittle brain. These findings indicate that the hypomyelination of the mutant cerebrum might result from reduced oligodendroglial proliferation due to growth hormone deficiency. 相似文献
99.
100.