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Shao-Chen Sun,Seung-Eun Lee,Yong-Nan Xu,Nam-Hyung Kim 한국발생생물학회 2010 한국발생생물학회 학술발표대회 Vol.29 No.-
Spc25 is a component of the Ndc80 complex which consists of Ndc80, Nuf2, Spc24, and Spc25. Previous work has shown that Spc25 is involved in regulation of kinetochore microtubule attachment, localization of Ndc80, and the spindle assembly checkpoint in mitosis. The role of Spc25 in meiosis remains unknown. Here, we report its expression, localization and functions in mouse oocyte meiosis. The Spc25 mRNA level gradually increased from the GV to MI stage, but decreased by MII during mouse oocyte meiotic maturation. Immunofluorescent staining showed that Spc25 was restricted to the germinal vesicle, and associated with chromosomes during all stages after GVBD. Overexpression of Spc25 resulted in oocyte meiotic arrest, chromosome misalignment and spindle disruption. Conversely, Spc25 RNAi resulted in precocious polar body extrusion and caused severe chromosome misalignment and aberrant spindle formation. Spc25 RNAi affected Ndc80 localization, but Ndc80 RNAi did not affect Spc25 localization.Survivin MO caused Ndc80 dispersion but did not affect localization of Spc25. Our data suggest that Spc25 is required for chromosome alignment, spindle formation, and spindle checkpoint activity through the regulation of Ndc80, but that Spc25 function is independent of survivin during meiosis.
( Chen Chen ),( Ming Zhong Sun ),( Shu Qing Liu ),( Dong Mei Yeh ),( Li Jun Yu ),( Yang Song ),( Lin Lin Gong ),( Li Hong Hao ),( Jun Hu ),( Shu Juan Shao ) 생화학분자생물학회 (구 한국생화학분자생물학회) 2010 BMB Reports Vol.43 No.8
Smad4 is involved in cancer progression and metastasis. Using a pair of human syngeneic epithelial ovarian cancer cells with low (HO-8910) and high (HO-8910PM) metastatic abilities, we aimed to reveal the role of Smad4 in ovarian cancer metastasis in vitro. Smad4 was down-regulated in HO-8910PM cell line relative to HO-8910 by implicating Smad4 was probably a potential tumor suppressor gene for ovarian cancer. Re-expression of Smad4 decreased the migration ability and inhibited the invasion capacity of HO-8910PM, while promoted the cell adhesion capacity for HO-8910PM. The stable expression of Smad4 increased the expression of E-cadherin, reduced the expression of plasminogen activator inhibitor-1 (PAI-1) and slightly down-regulated the expression of VEGF. Smad4 suppresses human ovarian cancer cell metastasis potential through its effect on the expressions of PAI-1, E-cadherin and VEGF. Results from current work implicate Smad4 might suppress the invasion and metastasis of human ovarian tumor cells through a TGF-β/Smad-mediated pathway. [BMB reports 2010; 43(8): 554-560]
Mycotoxins Containing Diet Affects Oocyte Quality in Mouse
Shao-Chen Sun,Yan-Jun Hou,Xiang-Shun Cui,Nam-Hyung Kim 한국동물생명공학회(구 한국동물번식학회) 2013 Reproductive & Developmental Biology(Supplement) Vol.37 No.2s
Background: Mycotoxins which mainly consist of Aflatoxin (AF), Zearalenone (ZEN) and Deoxynivalenol (DON) are commonly found in many food commodities, each component has been shown to cause organ toxicity and oxidative stress in several species. Our previous study showed that mycotoxin-contaminated diet could cause oxidative stress in liver, kidney, spleen. Recently we examined its effects on oocyte quality. Materials and Methods: Mycotoxins-contaminated maize (AF 597μg/kg, ZEN 729μg/kg, DON 3.1mg/kg maize) was incorporated into the diet at three different doses (0, 5 and 20%) to feed the mice for 4 weeks. Results: Our results showed that the both the index of ovary and the number of good GV oocytes decreased in the mycotoxin-treated mice. The oocytes from mycotoxin- treated mouse displayed low developmental competence showing with lower GVBD and polar body extrusion rate; the embryo developmental competence also showed the similar pattern, most embryos could not develop to blastocyst stage. The cytoskeleton component actin expression in both oocyte cortex and cytoplasm decreased, and the expression of actin nucleation factor Profilin and mDia1 also decreased, indicating that mycotoxin may affect oocyte quality through the effects on actin. Moreover, a big proportion of oocytes with mycotoxin contaminated diet treatment showed disrupted cortical granule free domain, spindle morphology and mitochondria distribution, further confirmed the oocyte quality declination. We also used the in vitro model to confirm this, we cultured the oocytes in the medium with Zearalenone, a key component of mycotoxins, and the results were similar with the in vivo model. Conclusion: Our data indicated that the mycotoxins were toxic to mouse reproductive system and induced the oocyte quality declination.
Two-Step Reset in the Resistance Switching of the Al/TiO<sub><i>x</i></sub>/Cu Structure
Shao, Xing L.,Zhao, Jin S.,Zhang, Kai L.,Chen, Ran,Sun, Kuo,Chen, Chang J.,Liu, Kai,Zhou, Li W.,Wang, Jian Y.,Ma, Chen M.,Yoon, Kyung J.,Hwang, Cheol S. American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.21
<P>Two-step reset behaviors in the resistance switching properties of the top Al/TiO<SUB><I>x</I></SUB>/bottom Cu structure were studied. During the electroforming and set steps, two types of conducting filaments composed of Cu and oxygen vacancies (Cu-CF and V<SUB>O</SUB>-CF) were simultaneously (or sequentially) formed when Al was negatively biased. In the subsequent reset step with the opposite bias polarity, the Cu-CFs ruptured first at ∼0.5 V, and formed an intermediate state. The trap-filled V<SUB>O</SUB>-CFs were transformed into a trap-empty state, resulting in a high-resistance state at ∼1 V. Matrix phase in the electrochemical metallization cell can play an active role in resistance switching.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-21/am403498q/production/images/medium/am-2013-03498q_0007.gif'></P>
Actin nucleator Arp2/3 complex is essential for mouse preimplantation embryo development
Sun, Shao-Chen,Wang, Qing-Ling,Gao, Wei-Wei,Xu, Yong-Nan,Liu, Hong-Lin,Cui, Xiang-Shun,Kim, Nam-Hyung CSIRO Publishing 2013 Reproduction, fertility, and development Vol.25 No.4
<P> The Arp2/3 complex is a critical actin nucleator, which promotes actin assembly and is widely involved in a diverse range of actin-related processes such as cell locomotion, phagocytosis and the establishment of cell polarity. Previous studies showed that the Arp2/3 complex regulates spindle migration and asymmetric division during mouse oocyte maturation; however, the role of the Arp2/3 complex in early mouse embryo development is still unknown. The results of the present study show that the Arp2/3 complex is critical for cytokinesis during mouse embryo development. The Arp2/3 complex was concentrated at the cortex of each cell at the 2- to 8-cell stage and the peripheral areas of the morula and blastocyst. Inhibition of the Arp2/3 complex by the specific inhibitor CK666 at the zygote stage caused a failure in cell division; mouse embryos failed to undergo compaction and lost apical-basal polarity. The actin level decreased in the CK666-treated group, and two or more nuclei were observed within a single cell, indicating a failure of cell division. Addition of CK666 at the 8-cell stage caused a failure of blastocyst formation, and CDX2 staining confirmed the loss of embryo polarity and the failure of trophectoderm and inner cell mass formation. Taken together, these data suggest that the Arp2/3 complex may regulate mouse embryo development via its effect on cell division. </P>