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        • KCI등재
        • Analysis of Small Fragment Deletions of the APC gene in Chinese Patients with Familial Adenomatous Polyposis, a Precancerous Condition

          Chen,,Qing-Wei,Zhang,,Xiao-Mei,Zhou,,Jian-Nong,Zhou,,Xin,Ma,,Guo-Jian,Zhu,,Ming,Zhang,,Yuan-Ying,Yu,,Jun,Feng,,Ji-Feng,Chen,,Sen-Qing Asian Pacific Organization for Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.12

          Background: : Familial adenomatous polyposis (FAP) is an autosomal dominant inherited disease mainly caused by mutations of the adenomatous polyposis coli (APC) gene with almost complete penetrance. These colorectal polyps are precancerous lesions that will inevitable develop into colorectal cancer at the median age of 40-year old if total proctocolectomy is not performed. So identification of APC germline mutations has great implications for genetic counseling and management of FAP patients. In this study, we screened APC germline mutations in Chinese FAP patients, in order to find novel mutations and the APC gene germline mutation characteristics of Chinese FAP patients. Materials and Methods: The FAP patients were diagnosed by clinical manifestations, family histories, endoscope and biopsy. Then patients peripheral blood samples were collected, afterwards, genomic DNA was extracted. The mutation analysis of the APC gene was conducted by direct polymerase chain reaction (PCR) sequencing for micromutations and multiplex ligation-dependent probe amplification (MLPA) for large duplications and/or deletions. Results: We found 6 micromutations out of 14 FAP pedigrees, while there were no large duplications and/or deletions found. These germline mutations are c.5432C>T(p. Ser1811Leu), two c.3926_3930delAAAAG (p.Glu1309AspfsX4), c.3921_3924delAAAA (p.Ile1307MetfsX13), c3184_3187delCAAA(p.Gln1061AspfsX59) and c4127_4126delAT (p.Tyr1376LysfsX9), respectively, and all deletion mutations resulted in a premature stop codon. At the same time, we found c.3921_3924delAAAA and two c.3926_3930delAAAAG are located in AAAAG short tandem repeats, c3184_3187delCAAA is located in the CAAA interrupted direct repeats, and c4127_4128 del AT is located in the 5'-CCTGAACA-3', 3'-ACAAGTCC-5 palindromes (inverted repeats) of the APC gene. Furthermore, deletion mutations are mostly located at condon 1309. Conclusions: Though there were no novel mutations found as the pathogenic gene of FAP in this study, we found nucleotide sequence containing short tandem repeats and palindromes (inverted repeats), especially the 5 bp base deletion at codon 1309, are mutations in high incidence area in APC gene,.

        • KCI등재

          Understanding Taiwanese Women's Decisional Experiences Regarding Prenatal Screening Procedures And Diagnostics: A Phenomenological Study

          Mei-Man,Chen,Bi-Hua,Cheng 한국간호과학회 2020 Asian Nursing Research Vol.14 No.4

          Purpose: This study sought to understand Taiwanese women's decisional experiences regarding prenatalscreening procedures and diagnostics. Methods: A hermeneutic phenomenological design guided semistructured interviews with 33 womenwho were 36 weeks pregnant. Data were collected between February and October 2016. Verbatimtranscripts were analyzed following hermeneutic circle to cocreate an understanding of Taiwanesewomen's decision-making in prenatal screening and diagnostics. Results: Women's existential experiences were derived from their decision-making process on prenatalscreening procedures and diagnostics for chromosomal aneuploidy. These decisional experiences werecaptured by four theme clusters and eight themes, which were inductively derived from 16 meaningunits: (1) accessing health information; (2) considering what was best for my baby; (3) consideringfamily finance; and (4) feeling anxiety posttest. Conclusion: Participants made informed choices on several prenatal screening procedures, ostensibly,based on their personal values and considerations. During the decision-making process, often-citedbenefits of genetic screenings were emphasized, but test limitations were often unheeded. A fundamentalneed for supportive information in decision making was further identified with recommendedstrategies. Hence, a revision of traditional genetic counseling approaches is recommended. As genomicstechnologies are increasingly available during antenatal services, women should be sufficiently educatedabout them to support decision making.

        • Expression and Prognostic Role of MEKK3 and pERK in Patients with Renal Clear Cell Carcinoma

          Chen,,Qi,Lu,,Hong-sheng,Gan,,Mei-fu,Chen,,Lan-xi,He,,Kai,Fan,,Guang-min,Cao,,Xue-quan Asian Pacific Organization for Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6

          Mitogen-activated protein kinase/extracellular signal-regulated kinase kinase kinase 3 (MEKK3) is an important serine/threonine protein kinase and a member of the MAPK family. MEKK3 can effectively activate the MEK/ERK signaling pathway and promote an autocrine growth loop critical for tumor genesis, cell proliferation, terminal differentiation, apoptosis and survival. To explore the relationship between MEKK3 and cell apoptosis, clinicopathology and prognosis, we characterize the expression of MEKK3, pERK and FoxP3 in the renal clear cell carcinoma (RCCC). Protein expression was detected by tissue microarray and immunochemistry in 46 cases of RCCC and 28 control cases. Expression levels of CD3+,CD3+CD4+,CD3+CD8+,CD4+CD25+, CD4+CD25+ FoxP3+ were assessed by flow cytometry and analyzed for their association with pathological factors, correlation and prognosis in RCCC. Expression of MEKK3, pERK and FoxP3 was significantly up-regulated in RCCC as compared to control levels (p<0.01), associated with pathological grade (p<0.05)and clinical stage (p<0.05). CD4+CD25+ Foxp3+ Treg cells were also significantly increased in RCCC patients (p<0.05). Cox multivariate regression analysis showed that MEKK3, pERK expression and patholigical stage were independent prognostic factors in patients with RCCC (p<0.05). MEKK3 can be used as an important marker of early diagnosis and prognostic evaluation in RCCC. It may be associated with imbalance of anti-tumor immunity and overexpression of pERK. Expression of MEKK3 and pERK are significantly increased in RCCC, with protein expression and clinical stage acting as independent prognostic factors.

        • KCI등재SCOPUS

          Smad4 mediates malignant behaviors of human ovarian carcinoma cell through the effect on expressions of E-cadherin, plasminogen activator inhibitor-1 and VEGF

          ( 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]

        • KCI등재SCOPUS

          Antioxidant Peptide Purified from Enzymatic Hydrolysates of Isochrysis Zhanjiangensis and Its Protective Effect against Ethanol Induced Oxidative Stress of HepG2 Cells

          Mei-Fang,Chen,Yuan,Yuan,Zhang,Mei,Di,He,Cheng,Yong,Li,Chun,Xia,Zhou,Peng,Zhi,Hong,Zhong-Ji,Qian 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.2

          Marine microalgae have been widely applied in cosmaceuticals, nutraceuticals, and functional foods. In the present study, we first investigated the hepatoprotective effects of peptide purified from microalgae, Isochrysis zhanjiangensis on HepG2 cells alcoholic injury. I. zhanjiangensis was hydrolyzed utilizing chymotrypsin, trypsin, pepsin, and by vitro gastrointestinal digestion. Among hydrolysates, the gastrointestinal hydrolysate showed relatively high free radical scavenging ability preliminarily and was purified with following sequential chromatography methods. The amino acid sequence and molecular mass of the purified peptide from I. zhanjiangensis (PIZ) was identified as Asn-Asp-Ala-Glu-Tyr-Gly-Ile-Cys-Gly-Phe (NDAEYGICGF; MW, 1088.16 Da) via Q-TOF ESI/MS. Additionally, PIZ attenuated ethanol-induced cytotoxicity and inhibited the production of intracellular reactive oxygen species by DCFH-DA assay. Western blot results showed that superoxide dismutase (SOD) and glutathione (GSH) levels up-regulated with PIZ treatment before alcohol exposure while gamma-glutamyltransferase (GGT) protein expression down-regulated. These results provide an opportunity to discover new highly active peptide against alcohol toxicity in HepG2 cells.

        • Formation and Biological Actions of Arachidonoyl-Endocannabinoids

          Mei,Chen,Jin,Dai-Eun,Sok 충남대학교 약학대학 의약품개발연구소 2012 藥學論文集 Vol.27 No.-

          While endocannabinoid lipids are known to play important roles in physiological functions such as cognition, pain and obesity, their roles as pro- or anti-inflammatory lipids remain to be clarified. The main endocannabinoids, 2-arachidonoyl-glycerol (2-AG) and arachidonyl-thanolamide (AEA), are reported to induce proand/or anti-inflammatory effects. Such arachidonoyl-endocannabinoids show a tendency to exert anti-inflammatory action in central systems, while pro-inflammatory action seems to be more predominant in peripheral tissues. This could be related to cell-specific cannabinoid receptor expression in tissues or the action of endocannabinoid-derived metabolites. In particular, 2-AG and AEA, containing a molecule of arachidonic acid (AA) in their structure, are hydrolyzed by a lipase and an amidase, respectively. Then, free AA, generated from hydrolysis of endocannabinoids, is oxygenated by 5-lipoxygenase, and converted leukotrienes, pro-inflammatory, or lipoxin, anti-inflammatory. Additionally, free AA is transformed to prostaglandins, pro-inflammatory PGE2 or anti-inflammatory deoxyPGJ2. Thus, the action of arachidonoyl-endocannabinoids may be determined by the cell type and enzyme activities such as hydrolases, lipoxygenases or cyclooxygenases. In this review, the first part provides a brief overview of endocannabinoids, and the second one deals with their formation and metabolism. Finally, this review discuss about the effects of endocannabinoid lipids on some CNS functions and inflammations, centrally or peripherall occuring.

        • HOW CUSTOMER ENGAGEMENT INFLUENCES USER ELOYALTY TO ONLINE HOTEL-BOOKING WEBSITES: ETRUST AS A MEDIATOR

          Mei-Fang,Chen 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07

          An increasing number of Internet users use hotel booking websites and online travel agencies to arrange trips and search for information related to their travels. This study investigates the impact of customer engagement on user perceptions of the quality and value of an online hotel-booking website, as well as whether such perceptions further influence user trust in online websites (eTrust) and result in behavioral intention of eLoyalty. The empirical results of structural equation modeling analysis of 400 questionnaire results collected in Taiwan reveal that customer engagement has a positive impact on perceived website quality (i.e., usability, ease of use, entertainment, and complementarity), which in turn influences perceived value. The results do not show a direct impact from customer engagement on perceived value. Finally, the results verify that eTrust mediates the relationship between consumers' perceived website quality and behavioral intention of eLoyalty toward an online hotel-booking website; eTrust also mediates the relationship between consumers' perceived value and behavioral intention of eLoyalty toward an online hotel-booking website. The findings provide both academic researchers and practitioners with a better understanding of customer engagement and facilitate development of more effective customer engagement strategies for online booking platforms.

        • KCI등재SCOPUS

          A Fatal Case of Naegleria fowleri Meningoencephalitis in Taiwan

          Mei-Yu,Su,Ming-Shih,Lee,Ling-Yuh,Shyu,Wei-Chen,Lin,Pei-Ching,Hsiao,Chi-Ping,Wang,Dar-Der,Ji,Ke-Min,Chen,Shih-Chan,Lai 대한기생충학열대의학회 2013 The Korean Journal of Parasitology Vol.51 No.2

          After bathing at a hot spring resort, a 75-year-old man presented to the emergency department because of seizure-like attack with loss of conscious. This is the first case of primary amebic meningoencephalitis (PAM) caused by Naegleria fowleri in Taiwan. PAM was diagnosed based on detection of actively motile trophozoites in cerebrospinal fluid using a wet-mount smear and the Liu's stain. The amoebae were further confirmed by PCR and gene sequencing. In spite of administering amphotericin B treatment, the patient died 25 days later.

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