• 제목/요약/키워드: S phase arrest

검색결과 162건 처리시간 0.022초

HepG2 인체간암세포의 세포주기조절인자 발현에 미치는 sulforaphane의 영향 (Modulation of Cell Cycle Regulators by Sulforaphane in Human Mepatocarcinoma HepG2 Cells)

  • 배송자;김기영;유영현;최병태;최영현
    • 생명과학회지
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    • 제16권7호
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    • pp.1235-1242
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    • 2006
  • 브로콜리를 포함한 십자화과 식물에서 glucoraphanin의 가수분해를 통해 생성되는 isothiocyanate의 일종인 sulforaphane은 역학적 조사를 포함한 다양한 선행 연구에서 강력한 암예방 효과를 가지는 것으로 알려져 있다. 항암효과에 관한 최근 연구 결과에 따르면 sulforaphane은 다양한 인체암세포의 증식을 억제하고 apoptosis를 유발할 수 있는 것으로 알려지고 있으나, 정확한 분자생물학적 기전은 밝혀져 있지 않은 상태이다. 본 연구에서는 sulforaphane의 항암작용 기전을 조사하기 위하여 HepG2 인체간암세포의 증식에 미치는 sulforaphane의 영 향을 조사하였다. Sulforaphane의 처리에 의한 HepG2 세포의 증식억제 및 형태적 변형은 세포주기 G2/M arrest 및 apoptosis 유발과 밀접한 관련이 있음을 알 수 있었다. RT-PCR 및 Western blot 분석 결과, sulforaphane 처리에 의하여 cyclin A 및 cyclin B1, Cdc2의 발현이 단백질 수준에서 선택적으로 저하되었으며, 종양억제 유전자 p53 및 Cdk inhibitor p21의 발현은 전사 및 번역 수준에서 sulforaphane 처리 농도 의존적으로 증가되었다. Sulforaphane의 항암 기전을 규명하기 위해서는 더 많은 연구가 부가적으로 필요하겠지만, 본 연구의 결과들에 의하면 sulforaphane은 강력한 인체암세포의 증식 억제 및 항암작용이 있을 것을 시사하여 준다고 할 수 있다.

Silicon transporter genes of Fragilariopsis cylindrus (Bacillariophyceae) are differentially expressed during the progression of cell cycle synchronized by Si or light

  • Oh, Han Sang;Lee, Sung-eun;Han, Chae-seong;Kim, Joon;Nam, Onyou;Seo, Seungbeom;Chang, Kwang Suk;Jin, EonSeon;Hwang, Yong-sic
    • ALGAE
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    • 제33권2호
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    • pp.191-203
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    • 2018
  • Fragilariopsis cylindrus is one of the most successful psychrophiles in the Southern Ocean. To investigate the molecular mechanism of biomineralization in this species, we attempted to synchronize F. cylindrus growth, since new cell wall formation is tightly coupled to the cell division process. Nutrient limitation analysis showed that F. cylindrus cultures rapidly stopped growing when deprived of silicate or light, while growth continued to a certain extent in the absence of nitrate. Flow cytometry analysis indicated that deprivation of either silicate or light could effectively arrest the cell cycle of this diatom species at the G1 phase, suggesting that synchrony can be established using either factor. Fluorescence labeling of new cell walls was faintly detectable as early as approximately 6 h after silicon repletion or light irradiation, and labeling was markedly intensified by 18 h. It is revealed that the synthesis of girdle bands begins before valve synthesis in this species, with active valve synthesis occurring during the G2 / M phase. Expression profiling revealed that selective member(s) of the F. cylindrus SIT genes (FcSIT) respond to silicate and light, with a different set of genes being responsive to each factor. The Si / light double depletion experiments demonstrated that expression of one FcSIT gene is possibly correlated to transition to G2 / M phase of the cell cycle, when the valve is actively formed.

Licochalcone D Inhibits Skin Epidermal Cells Transformation through the Regulation of AKT Signaling Pathways

  • Sun-Young Hwang;Kwanhwan Wi;Goo Yoon;Cheol-Jung Lee;Soong-In Lee;Jong-gil Jung;Hyun-Woo Jeong;Jeong-Sang Kim;Chan-Heon Choi;Chang-Su Na;Jung-Hyun Shim;Mee-Hyun Lee
    • Biomolecules & Therapeutics
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    • 제31권6호
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    • pp.682-691
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    • 2023
  • Cell transformation induced by epidermal growth factor (EGF) and 12-O-tetradecanoylphorbol-13-acetate (TPA) is a critical event in cancer initiation and progression, and understanding the underlying mechanisms is essential for the development of new therapeutic strategies. Licorice extract contains various bioactive compounds, which have been reported to have anticancer and anti-inflammatory effects. This study investigated the cancer preventive efficacy of licochalcone D (LicoD), a chalcone derivative in licorice extract, in EGF and TPA-induced transformed skin keratinocyte cells. LicoD effectively suppressed EGF-induced cell proliferation and anchorage-independent colony growth. EGF and TPA promoted the S phase of cell cycle, while LicoD treatment caused G1 phase arrest and down-regulated cyclin D1 and up-regulated p21 expression associated with the G1 phase. LicoD also induced apoptosis and increased apoptosis-related proteins such as cleaved-caspase-3, cleaved-caspase-7, and Bax (Bcl2-associated X protein). We further investigated the effect of LicoD on the AKT signaling pathway involved in various cellular processes and found decreased p-AKT, p-GSK3β, and p-NFκB expression. Treatment with MK-2206, an AKT pharmacological inhibitor, suppressed EGF-induced cell proliferation and transformed colony growth. In conclusion, this study demonstrated the potential of LicoD as a preventive agent for skin carcinogenesis.

S-allylcysteine의 자궁경부암세포주 HeLa에 대한 세포증식 억제효과 (Inhibitory Effects of S-allylcysteine on Cell Proliferation of Human Cervical Cancer Cell Line, HeLa)

  • 김현희;민계식
    • 생명과학회지
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    • 제25권4호
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    • pp.397-405
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    • 2015
  • S-allylcysteine (SAC)은 숙성마늘에 다량 함유된 수용성 유기황 화합물로서 항산화 및 항염증 효과뿐만 아니라 여러 유형의 암에서 예방 및 항암 치료를 위한 하나의 식품유래 대체물질로 주목 받아 오고 있다. 그러나, SAC에 의한 자궁경부암세포에서의 항암효과는 아직 보고된 바 없다. 본 연구의 목적은 SAC가 자궁경부암세포주 HeLa의 증식에 미치는 억제효과를 분석하고, 이에 대한 세포 항증식 작용기전 중 세포자멸 및 세포주기에 미치는 영향을 조사하는데 있다. 이를 위하여, 먼저 다양한 농도의 SAC가 처리기간에 따라 세포증식에 미치는 영향을 분석하였다. SAC 처리는 HeLa 세포의 형태학적 변화를 유도하였을 뿐만 아니라, 세포의 viability 감소 그리고 농도 및 시간 의존적인 세포증식 억제효과를 초래하였다. 또한 SAC는 DNA fragmentation assay 및 TUNEL assay에서 DNA 분절을 유도하였으며, 세포주기 분석에서 G2/M기에서의 세포주기 억제를 유도하였다. 이러한 결과는 SAC가 최소한 부분적으로 세포사멸의 유도 및 세포주기의 통제를 통하여 HeLa 세포의 증식을 억제함을 제시한다.

Unexpected Aggravation of COVID-19 After Recovery in Three Adolescents With Chronic Neurologic Conditions: A Case Series

  • Dayun Kang;Seung Ha Song;Bin Ahn;Bongjin Lee;Ki Wook Yun
    • Pediatric Infection and Vaccine
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    • 제29권3호
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    • pp.147-154
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    • 2022
  • 코로나바이러스-19 (COVID-19)는 일반적으로 성인에 비해 소아에서 임상적으로 경한 양상을 보이며, 대부분의 소아에서 약 7일간의 격리가 끝나면 증상이 호전되어 특별한 이벤트 없이 퇴원하게 된다. 우리는 통상적인 임상경과와는 다르게, 격리 해제시점 또는 퇴원을 고려하고 있는 시점에 갑자기 악화된 임상증상을 보이는 3명의 청소년 환아들을 경험하였다. 세 명의 아이들은 공통적으로 신경학적 질환을 기저질환으로 가지고 있었다. Case 1은 울리히 선천성 근디스트로피로 진단받고 밤에만 이중양압기로 호흡보조를 받던 17세 남환의 경우로, 첫 COVID-19 증상 이후 9일이 지나고 증상 호전되어 퇴원을 준비하던 중 심폐정지가 발생하였다. Case 2는 뇌출혈 및 뇌경색 이후 병상에 누워 지내며 기관절개관 삽입 후 가정용 인공호흡기로 호흡보조를 받던 12세 여자 환아로, 증상이 호전되어 퇴원하였으나 첫 COVID-19 증상 이후 11일이 지난 후 심폐정지가 발생하였다. Case 3의 경우 조산아로 출생하여 뇌실출혈 및 수두증 진단받고 병상에 누워 지내나 호흡보조는 받지 않았던 12세 남자 환아로, 첫 증상 이후 호전추세였으나 10일 후 다기관 기능부전 확인되어 입원 진행하였다. 항바이러스제, 스테로이드제, 경험적 항생제가 투여되었고 중환자실 치료를 시행하였다. 세 환아들 중 2명 (case 1, 3)은 치료를 통해 호전되었으나, 1명 (case 2)는 심부전 진행하여 사망하였다. 이러한 경험에 비추어 볼 때, COVID-19 격리 기간이 끝나고 퇴원 가능한 시점이라도 갑작스러운 증상 악화를 보일 가능성이 있기에, 긴장을 놓지 않고 임상 증상의 변화를 확인하고 필요시 빠른 조치를 취해야 할 것으로 생각된다. 특히 신경학적 또는 호흡기적 만성 질환을 갖는 아이들에게 주의가 더 필요할 것으로 생각된다.

Effects of Down-regulation of HDAC6 Expression on Proliferation, Cell Cycling and Migration of Esophageal Squamous Cell Carcinoma Cells and Related Molecular Mechanisms

  • Li, Ning;Tie, Xiao-Jing;Liu, Pei-Jie;Zhang, Yan;Ren, Hong-Zheng;Gao, Xin;Xu, Zhi-Qiao
    • Asian Pacific Journal of Cancer Prevention
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    • 제14권2호
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    • pp.685-689
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    • 2013
  • Objective: To study the effects of down-regulation of HDAC6 expression on proliferation, cell cycling and migration of esophageal squamous cell carcinoma (ESCC) cells and related molecular mechanisms. Methods: ESCC cell line EC9706 cells were randomly divided into untreated (with no transfection), control siRNA (transfected with control siRNA) and HDAC6 siRNA (transfected with HDAC6 small interfering RNA) groups. Effects of HDAC6 siRNA interference on expression of HDAC6 mRNA and protein in EC9706 cells were investigated by semi-quantitative RT-PCR, Western blotting and immunocytochemistry methods. Effects of down-regulation of HDAC6 expression on cell proliferation, cell cycle, and cell migration were studied using a CCK-8 kit, flow cytometry and Boyden chambers, respectively. Changes of mRNA and protein expression levels of cell cycle related factor (p21) and cell migration related factor (E-cadherin) were investigated by semi-quantitative RT-PCR and Western blotting methods. Results: After transfection of HDAC6 siRNA, the expression of HDAC6 mRNA and protein in EC9706 cells was significantly downregulated. In the HDAC6 siRNA group, cell proliferation was markedly inhibited, the percentage of cells in G0/G1 phase evidently increased and the percentage of cells in S phase decreased, and the number of migrating cells significantly and obviously decreased. The mRNA and protein expression levels of p21 and E-cadherin in the HDAC6 siRNA group were significantly higher than those in the untreated group and the control siRNA group, respectively. Conclusions: HDAC6 siRNA can effectively downregulate the expression of HDAC6 mRNA and protein in EC9706 cells. Down-regulation of HDAC6 expression can obviously inhibit cell proliferation, arrest cell cycling in the G0/G1 phase and reduce cell migration. The latter two functions may be closely related with the elevation of mRNA and protein expression of p21 and E-cadherin.

Genistein과 TRAIL의 복합처리에 의한 U937 인체 혈구암 세포의 Apoptosis 유도 (Induction of Apoptosis by Combined-treatment with Genistein and TRAIL in U937 Human Leukemia Cells)

  • 최영현;한민호
    • 한국식품영양과학회지
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    • 제40권9호
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    • pp.1201-1207
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    • 2011
  • TRAIL은 최근 암세포의 apoptosis 유도를 위한 효율적인 도구로 제시되었으나 많은 암세포들이 TRAIL 저항성을 획득한 것으로 알려져 TRAIL 저항성 극복을 위한 새로운 방법론의 제시가 요구되어지고 있다. Genistein은 대두의 대표적인 생리활성 물질인 isoflavonoid의 일종으로 많은 암세포에서 G2/M arrest를 유발하면서 apoptosis를 유도하는 것으로 알려져 있다. 본 연구에서는 U937 인체백혈병세포를 대상으로 genistein에 의한 TRAIL 유도 apoptosis의 감수성 증대 여부를 조사하였다. 본 연구의 결과에 의하면 U937 세포에서 세포독성이 없는 범위의 genistein 처리는 TRAIL에 의한 apoptosis 유도를 매우 증진시켰으며, 이는 tBid의 발현 증가와 cFLIPL의 발현 감소와 연계된 caspase의 활성 증가와 연관성이 있었다. 또한 caspase의 활성 저해제는 genistein과 TRAIL의 복합처리에 의한 apoptosis를 유의적으로 감소시켜 복합 처리에 의한 apoptosis의 유도에 caspase의 활성 증대가 필수적임을 알 수 있었다. 따라서 genistein은 TRAIL 저항성을 획득한 암세포의 효율적인 combined therapy approach를 위해 유용하게 사용될 수 있음을 알 수 있었다.

Hsa_Circ_0001947/MiR-661/DOK7 Axis Restrains Non-Small Cell Lung Cancer Development

  • Bao, Yuyan;Yu, Yanjie;Hong, Bing;Lin, Zhenjian;Qi, Guoli;Zhou, Jie;Liu, Kaiping;Zhang, Xiaomin
    • Journal of Microbiology and Biotechnology
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    • 제31권11호
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    • pp.1508-1518
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    • 2021
  • Hsa_circ_0001947 is associated with multiple cancers, but its function in non-small cell lung cancer (NSCLC) is ambiguous and needs further research. The targeting relationship among circ_0001947, miR-661, and downstream of tyrosine kinase 7 (DOK7) was predicted by database and further verified by dual-luciferase reporter assay, while their expressions in cancer tissues and cells were detected by quantitative real-time polymerase chain reaction (qRT-PCR). After transfection, cell biological behaviors and expressions of miRNAs, miR-661 and DOK7 were determined by cell function experiments and qRT-PCR, respectively. Circ_0001947 was low-expressed in NSCLC tissues and cells. Circ_0001947 knockdown intensified cell viability and proliferation, induced cell cycle arrest at S phase, suppressed apoptosis and evidently enhanced miR-510, miR-587, miR-661 and miR-942 levels, while circ_0001947 overexpression did the opposite. MiR-661 was a target gene of circ_0001947 that participated in the regulation of circ_0001947 on cell biological behaviors. Furthermore, DOK7, the target gene of miR-661, partly participated in the regulation of miR-661 on cell viability. Hsa_circ_0001947 acts as a sponge of miR-661 to repress NSCLC development by elevating the expression of DOK7.

Candicidal Action of Resveratrol Isolated from Grapes on Human Pathogenic Yeast C. albicans

  • Jung, Hyun-Jun;Seu, Young-Bae;Lee, Dong-Gun
    • Journal of Microbiology and Biotechnology
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    • 제17권8호
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    • pp.1324-1329
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    • 2007
  • Resveratrol (3,5,4'-trihydroxystilbene) is a naturally occurring, multi-biofunctional chemical existing in grapes and various other plants as a polyphenol type, and it is one of the best known natural anticancer and antiatherosclerosis reagents. In this study, we investigated the antifungal action by resveratrol in Candida albicans, which is a human infectious fungi as an agent of candidiasis. Resveratrol displayed potent fungicidal activity in an energy-dependent manner, without any hemolytic effects against human erythrocytes. It was found that the serum-induced mycelial forms, which playa crucial role in the pathogenesis of C. albicans during host tissue invasion, were disrupted by resveratrol. To understand the correlation between lethal effects and resveratrol action, we examined the physiological changes of C. albicans. A significant accumulation of intracellular trehalose was induced by stress responses to resveratrol action, and a remarkable arrest of cell-cycle processes at the S-phase in C. albicans occured. Therefore, the fungicidal effects of resveratrol demonstrate that this compound is a potential candidate as an antifungal agent in treating infectious diseases by candidal infections.

ER membrane protein complex subunit 6 (EMC6) is a novel tumor suppressor in gastric cancer

  • Wang, Xiaokun;Xia, Yan;Xu, Chentong;Lin, Xin;Xue, Peng;Zhu, Shijie;Bai, Yun;Chen, Yingyu
    • BMB Reports
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    • 제50권8호
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    • pp.411-416
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    • 2017
  • The endoplasmic reticulum (ER) membrane protein complex subunit 6 (EMC6) is a novel human autophagy-related molecule. Here, using tissue microarray and immunohistochemistry, we report that EMC6 protein is lost or reduced in glandular cells of patients with gastric adenocarcinoma, compared to normal stomach mucosa. Overexpression of EMC6 in gastric cancer cells inhibited cell growth, migration, invasion, and induced apoptosis and cell cycle arrest at S-phase. Further investigation suggested that EMC6 overexpression in BGC823 human adenocarcinoma gastric cancer cells reduced tumorigenicity in a xenograft model, demonstrating that EMC6 has the characteristics of a tumor suppressor. This is the first study to show that EMC6 induces cell death in gastric cancer cells. The molecular mechanism of how EMC6 functions as a tumor suppressor needs to be further explored.