• 제목/요약/키워드: yi he ming

검색결과 36건 처리시간 0.018초

Mechanistic Analysis of Taxol-induced Multidrug Resistance in an Ovarian Cancer Cell Line

  • Wang, Ning-Ning;Zhao, Li-Jun;Wu, Li-Nan;He, Ming-Feng;Qu, Jun-Wei;Zhao, Yi-Bing;Zhao, Wan-Zhou;Li, Jie-Shou;Wang, Jin-Hua
    • Asian Pacific Journal of Cancer Prevention
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    • 제14권9호
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    • pp.4983-4988
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    • 2013
  • Objectives: To establish a taxol-resistant cell line of human ovarian carcinoma (A2780/Taxol) and investigate its biological features. Methods: The drug-resistant cell line (A2780/Taxol) was established by continuous stepwise selection with increasing concentrations of Taxol. Cell morphology was assessed by microscopy and growth curves were generated with in vitro and in vivo tumor xenograft models. With rhodamine123 (Rh123) assays, cell cycle distribution and the apoptotic rate were analyzed by flow cytometry (FCM). Drug resistance-related and signal associated proteins, including P-gp, MRPs, caveolin-1, PKC-${\alpha}$, Akt, ERK1/2, were detected by Western blotting. Results: A2780/Taxol cells were established with stable resistance to taxol. The drug resistance index (RI) was 430.7. Cross-resistance to other drugs was also shown, but there was no significant change to radioresistance. Compared with parental cells, A2780/Taxol cells were significantly heteromorphous, with a significant delay in population doubling time and reduced uptake of Rh123 (p<0.01). In vivo, tumor take by A2780 cells was 80%, and tumor volume increased gradually. In contrast, with A2780/Taxol cells in xenograft models there was no tumor development. FCM analysis revealed that A2780/Taxol cells had a higher percentage of G0/G1 and lower S phase, but no changes of G2 phase and the apoptosis rate. Expression of P-gp, MRP1, MRP2, BCRP, LRP, caveolin-1, PKC-${\alpha}$, Phospho-ERK1/2 and Phospho-JNK protein was significantly up-regulated, while Akt and p38 MARK protein expression was not changed in A2780/Taxol cells. Conclusion: The A2780/Taxol cell line is an ideal model to investigate the mechanism of muti-drug resistance related to overexpression of drug-resistance associated proteins and activation of the PKC-${\alpha}/ERK$ (JNK) signaling pathway.

Prognostic Threshold of Neuroendocrine Differentiation in Gastric Carcinoma: a Clinicopathological Study of 945 Cases

  • Zou, Yi;Chen, Linying;Wang, Xingfu;Chen, Yupeng;Hu, Liwen;Zeng, Saifan;Wang, Pengcheng;Li, Guoping;Huang, Ming;Wang, Liting;He, Shi;Li, Sanyan;Jian, Lihui;Zhang, Sheng
    • Journal of Gastric Cancer
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    • 제19권1호
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    • pp.121-131
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    • 2019
  • Purpose: The significance of neuroendocrine differentiation (NED) in gastric carcinoma (GC) is controversial, leading to ambiguous concepts in traditional classifications. This study aimed to determine the prognostic threshold of meaningful NED in GC and clarify its unclear features in existing classifications. Materials and Methods: Immunohistochemical staining for synaptophysin, chromogranin A, and neural cell adhesion molecule was performed for 945 GC specimens. Survival analysis was performed using the log-rank test and univariate/multivariate models with percentages of NED ($P_{NED}$) and demographic and clinicopathological parameters. Results: In total, 275 (29.1%) cases were immunoreactive to at least 1 neuroendocrine (NE) marker. GC-NED was more common in the upper third of the stomach. $P_{NED}$, and Borrmann's classification and tumor, lymph node, metastasis stages were independent prognostic factors. The cutoff $P_{NED}$ was 10%, beyond which patients had significantly worse outcomes, although the risk did not increase with higher $P_{NED}$. Tumors with ${\geq}10%$ NED tended to manifest as Borrmann type III lesion with mixed/diffuse morphology and poorer histological differentiation; the NE components in this population mainly grew in insulae/nests, which differed from the predominant growth pattern (glandular/acinar) in GC with <10% NED. Conclusions: GC with ${\geq}10%$ NED should be classified as a distinct subtype because of its worse prognosis, and more attention should be paid to the necessity of additional therapeutics for NE components.

'의' 개념을 중심으로 본 유종주의 사구교 사상 (Liu Zongzho's Thought of Four-Sentence Teaching and "Intention")

  • 임홍태
    • 한국철학논집
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    • 제25호
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    • pp.411-437
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    • 2009
  • 일반적으로 왕양명으로부터 유종주에로의 사상적 전환은 곧 '주체성(主體性)'에 대한 강조에서 '의향성(意向性)'에 대한 강조로의 전환으로 해석된다. 이러한 주체성에 대한 강조에서부터 의향성에 대한 강조로의 전환은 왕양명이 제시한 사구교와 이에 대한 비판을 기초로 유종주가 새롭게 제시하는 사구교의 차이에서 두드러지게 나타난다. 왕양명이 말년에 제시한 사구교 사상에 대한 논란은 양명 생전부터 있어왔으며 이는 양명 사후에도 끊임없이 논란의 대상이 되었다. 사구교에 대한 논란으로 말미암아 양명학파는 분화의 과정을 겪게 되었으며, 이는 또한 명말청초 학술계에서 주요 논쟁 중의 하나로 자리잡게 되었다. 유종주의 사구교에 대한 비판과 재해석 또한 이러한 논쟁 과정을 통해 산출된 결과물이라 하겠다. 왕양명과 유종주의 심학의 차이는 '의'에 대한 서로 다른 해석에서 말미암는다. 주지하다시피 왕양명에게 있어 '의'는 마음의 발한 이발의 상태에 있는 것이지만, 유종주가 말하는 '의'는 마음 속에 내재하여 마음이 마음일 수 있는 근거가 되는 존재이다. 이러한 '의'에 대한 해석 차이로 말미암아 유종주는 궁극적으로 왕양명의 사구교와는 다른 내용의 새로운 사구교 사상을 제시하기에 이른다. 양명학 비판에 있어 그는 왕양명의 본래 의미에 대한 충분한 이해없이 자기 자신의 개인적인 견해를 바탕으로 양명학을 해석한 면이 없지 않았고, 또한 자기 자신이 이해한 "대학"의 의리(義理)를 기준으로 삼아 양명학의 시비를 판단하는 경향을 보이고 있다. 따라서 그의 양명학에 대한 비판은 종종 이치에 맞지 않는 면도 있다. 비록 유종주의 양명학에 대한 이해와 이를 바탕으로 한 양명학에 대한 비판이 비합리적인 요소를 내포하고 있다고 하나, 유종주의 양명학에 대한 견해는 나름대로의 의의가 있다. 유종주의 양명학 비판은 단순히 왕양명 사상을 비판하기 위한 것이 아니라 시대적인 병폐를 치유하기 위한 것이었다. 이 결과 그는 왕양명 사구교에 대한 새로운 해석을 통해 자신만의 독특한 심학이론을 제시하게 되는 것이다.

Mitochondrial DNA variation and phylogeography of Old World camels

  • Ming, Liang;Siren, Dalai;Yi, Li;Hai, Le;He, Jing;Ji, Rimutu
    • Animal Bioscience
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    • 제34권4호
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    • pp.525-532
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    • 2021
  • Objective: Old World camels are a valuable genetic resource for many countries around the world due to their adaptation to the desert environment. At present, Old World camels have encountered the challenge of unprecedented loss of genetic resources. Through our research, we would reveal the population structure and genetic variation in Old World camel populations, which provides a theoretical basis for understanding the germplasm resources and origin and evolution of different Old World camel populations. Methods: In the present study, we assessed mtDNA control region sequences of 182 individuals from Old World camels to unravel genetic diversity, phylogeography, and demographic dynamics. Results: Thirty-two haplotypes confirmed by 54 polymorphic sites were identified in the 156 sequences, which included 129 domestic and 27 wild Bactrian camels. Meanwhile, 14 haplotypes were defined by 47 polymorphic sites from 26 sequences in the dromedaries. The wild Bactrian camel population showed the lowest haplotype and nucleotide diversity, while the dromedaries investigated had the highest. The phylogenetic analysis suggests that there are several shared haplotypes in different Bactrian camel populations, and that there has been genetic introgression between domestic Bactrian camels and dromedaries. In addition, positive values of Tajima's D and Fu's Fs test demonstrated a decrease in population size and/or balancing selection in the wild Bactrian camel population. In contrast, the negative values of Tajima's D and Fu's Fs test in East Asian Bactrian camel populations explained the demographic expansion and/or positive selection. Conclusion: In summary, we report novel information regarding the genetic diversity, population structure and demographic dynamics of Old World camels. The findings obtained from the present study reveal that abundant genetic diversity occurs in domestic Bactrian camel populations and dromedaries, while there are low levels of haplotype and nucleotide diversity in the wild Bactrian camel population.

Betulin Targets Lipin1/2-Meidated P2X7 Receptor as a Therapeutic Approach to Attenuate Lipid Accumulation and Metaflammation

  • Dou, Jia-Yi;Jiang, Yu-Chen;Hu, Zhong-He;Yao, Kun-Chen;Yuan, Ming-Hui;Bao, Xiao-Xue;Zhou, Mei-Jie;Liu, Yue;Li, Zhao-Xu;Lian, Li-Hua;Nan, Ji-Xing;Wu, Yan-Ling
    • Biomolecules & Therapeutics
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    • 제30권3호
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    • pp.246-256
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    • 2022
  • The present study focused on the potential mechanism of betulin (BT), a pentacyclic triterpenoid isolated from the bark of white birch (Betula pubescens), against chronic alcohol-induced lipid accumulation and metaflammation. AML-12 and RAW 264.7 cells were administered ethanol (EtOH), lipopolysaccharide (LPS) or BT. Male C57BL/6 mice were fed Lieber-DeCarli liquid diets containing 5% EtOH for 4 weeks, followed by single EtOH gavage on the last day and simultaneous treatment with BT (20 or 50 mg/kg) by oral gavage once per day. In vitro, MTT showed that 0-25 mM EtOH and 0-25 µM BT had no toxic effect on AML-12 cells. BT could regulate sterolregulatory-element-binding protein 1 (SREBP1), lipin1/2, P2X7 receptor (P2X7r) and NOD-like receptor family, pyrin domains-containing protein 3 (NLRP3) expressions again EtOH-stimulation. Oil Red O staining also indicated that BT significantly reduced lipid accumulation in EtOH-stimulated AML-12 cells. Lipin1/2 deficiency indicated that BT might mediate lipin1/2 to regulate SREBP1 and P2X7r expression and further alleviate lipid accumulation and inflammation. In vivo, BT significantly alleviated histopathological changes, reduced serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and triglyceride (TG) levels, and regulated lipin1/2, SREBP1, peroxisome proliferator activated receptor α/γ (PPARα/γ) and PGC-1α expression compared with the EtOH group. BT reduced the secretion of inflammatory factors and blocked the P2X7r-NLRP3 signaling pathway. Collectively, BT attenuated lipid accumulation and metaflammation by regulating the lipin1/2-mediated P2X7r signaling pathway.

여조겸(呂祖謙) 심론(心論) 연구(硏究) : 여조겸과 주희의 사상적 대립과 절충 (A Study on the theory of Mind in LüZuqian(呂祖謙) philosophy)

  • 연재흠
    • 한국철학논집
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    • 제38호
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    • pp.63-96
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    • 2013
  • 주희 장식과 더불어 동남삼현(東南三賢)이라 일컬어지는 여조겸(呂祖謙)은 남송시대 대표적인 철학자 가운데 한 사람이다. 여조겸은 심후한 가학(家學)을 바탕으로 당시의 학자들과 폭넓게 교류하며 자신의 학문체계를 건립하였다. 여조겸의 심론(心論)은 기본적으로 맹자의 양심(良心) 본심(本心)에 관한 이론에 기초하고 있다. 여조겸은 초심(初心) 내심(內心)을 통해 이러한 양심의 의미를 설명하였다. 여조겸에 따르면 양심이 외부사물과 접촉했을 때 바로 생기는 마음이 초심(初心)이며, 초심(初心)은 외부사물에 대해 옳은 판단을 내릴 수 있다. 내심(內心)은 도덕적 자각능력을 회복한 양심 본심을 의미한다. 여조겸의 심론(心論)의 중요한 특징은 심외무도(心外無道) 심외무천(心外無天)에 있다. 여조겸은 이를 통해 마음과 천(天) 도(道) 리(理)가 하나임을 강조하였다. 여조겸은 아호사(鵝湖寺)의 모임을 주선하며, 주희와 육구연의 학문적 절충을 위해 노력하였다. 그러나 발명본심(發明本心)을 주장했던 육구연과는 달리 양심의 자각과 더불어 도문학(道問學) 역시 중시하였다. 한편 여조겸은 주희와 마찬가지로 경(敬)을 중시하였다. 그러나 여조겸에게 있어 경(敬)이란 순일불잡(純一不雜)한 도덕심(道德心)의 무간단(無間斷)을 의미하며, 성(誠)과 동일한 함의를 지니고 있다. 여조겸은 독서와 강학을 중시하였지만, 마음의 자각과 반성, 간단(間斷) 없는 지속을 통해 리(理)를 이해하고 실현할 수 있다고 주장하였다. 이와 같이 주희와의 절충과 대립을 통해 드러나는 여조겸의 심학적(心學的) 학풍(學風)은 남송 시대 사상계에서 중요한 의미를 지닌다고 할 수 있다.