• Title, Summary, Keyword: COX-2

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CELECOXB (CELEBREX) INHIBITS PHORBOL ESTER-INDUCED COX-2 EXPRESSION AND $PGE_2$ PRODUCTION IN MOUSE SKIN: AP-1 AND C/EBP AS POSSIBLE MOLECULAR TARGETS

  • Chun, Kyung-Soo;Surh, Young-Joon
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.103-104
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    • 2002
  • Cyclooxygenase (COX), an important enzyme involved in mediating the inflammation, catalyzes the rate-limiting step in the formation of prostaglandins from arachidonic acid. There are two isoforms of COX, designated as COX-1 and COX-2. While COX-1 is constitutively expressed in most tissues, COX-2 can be induced transiently by proinflammatory cytokines, endotoxins, growth factors, oncogenes, UV and mitogens.(omitted)

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Synthesis and Biological Activity of Annulated Pyrazoles as Selective COX-2 Inhibitors. I.

  • Kim, Hyun-Hee;Park, Jae-Gyu;Moon, Tae-Chul;Chang, Hyun-Wook;Jahng, Yurng-Dong
    • Archives of Pharmacal Research
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    • v.22 no.4
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    • pp.372-379
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    • 1999
  • A series of disubstituted 4,5-polymethylenepyrazoles were synthesized and evaluated their inhibitory activities against COX-2. Some compounds showed strong (0.3 nM) inhibitory activity on COX-2 and were found somewhat selective (up to 16) on COX-2 over COX-1.

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Relation between Cyclooxygenase-2 and Polo-like Kinase-1 in Non-Small Cell Lung Cancer (비소세포 폐암에서 Cyclooxygenase-2와 Polo-like Kinase-1의 상관관계)

  • Lee, Kyu-Hwa;Yang, Seok-Chul
    • Tuberculosis and Respiratory Diseases
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    • v.67 no.4
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    • pp.303-310
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    • 2009
  • Background: Elevated expression of cyclooxygenase-2 (COX-2) and Polo-like kinase-1 (PLK-1) is observed in a wide variety of cancers. Augmented expression of COX-2 and enhanced production of prostaglandin $E_2(PGE_2)$ are associated with increased tumor cell survival and malignancy; COX-2 has been implicated in the control of human non-small cell lung carcinoma (NSCLC) cell growth. PLK-1 siRNA induced the cell death of lung cancer cells and the systemic administration of PLK-1 siRNA/atelocollagen complex inhibited the growth of lung cancer in a liver metastatic murine model. COX-2 and PLK-1 are involved in proliferation and in cell cycle regulation, and there is a significant correlation between their interaction in prostate carcinoma. Methods: In this study, we investigated the pattern of COX-2 and PLK-1 expression in NSCLC, after treatment with IL-1$\beta$, COX-2 inhibitor and PLK-1 siRNA. Results: Expression of PLK-1 was decreased in A549 COX-2 sense cells, and was increased in A549 COX-2 anti-sense cells. Knock out of PLK-1 expression by PLK-1 siRNA augmented COX-2 expression in A549 and NCl-H157 cells. When A549 and NCI-H157 cells were treated with COX-2 inhibitor on a dose-dependent basis, PLK-1 and COX-2 were reduced. However, when the expression of COX-2 was induced by IL-1$\beta$, the production of PLK-1 decreased. Conclusion: These results demonstrate that COX-2 and PLK-1 are regulated and inhibited by each other in NSCLC, and suggest that these proteins have a reverse relationship in NSCLC.

COX-2 Expression in Renal Cell Carcinoma and Correlations with Tumor Grade, Stage and Patient Prognosis

  • Tabriz, Hedieh Moradi;Mirzaalizadeh, Marzieh;Gooran, Shahram;Niki, Farzaneh;Jabri, Maryam
    • Asian Pacific Journal of Cancer Prevention
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    • v.17 no.2
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    • pp.535-538
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    • 2016
  • Background: Cyclooxygenase 2 (COX-2) is important as an enzyme in the pathway leading to the production of prostaglandin E2 (PGE2) and arachidonic acid. This pathway is known to play a role in inflammation, tumor growth, invasiveness and metastasis, inhibition of apoptosis and angiogenesis. Inhibition of COX-2 has been shown to be a promising antitumor and antiangiogenic strategy in several tumor types, including renal cell carcinoma (RCC). Therefore, we decided to evaluate the immunohistochemical expression of this marker and its association with several clinicopathological characteristics in a series of cases. Materials and Methods: COX-2 expression was examined immunohistochemically in tumor tissues obtained from 96 patients who underwent radical (94 cases) or partial (2 cases) nephrectomy. Correlations between COX-2 expression and clinicopathologic findings including pathologic stage, nuclear grade and other indicator of prognosis were examined. Results: Of 96 tumors, 20.9% were positive for COX-2 expression. A correlation was found between COX-2 expression and tumor histological subtype (P=0.03).The papillary subtype showed maximum expression of this marker (43.8%) and the clear subtype minimum (14.7%). There were also possible links between COX-2 expression and pathologic stage, nuclear grade and nodal involvement but the results were not statistically significant (P=0.8, P= 0.14 and P=0.06, respectively). No correlation was found between COX2 expression and patient age, gender, tumor size, metastasis or survival. Conclusions: In our study, COX-2 expression was correlated with the histological subtype of RCC. Additional research is required to determine the link between COX-2 expression and prognosis and also evaluation of probable effectiveness of COX-2 inhibitor drugs in treatment of RCC patients.

Cyclic Expression of Cyclooxygenase-l and -2 in Human Endometrium (인간 자궁내막에서 Cyclooxygenase-1과 -2의 주기적 발현 양상)

  • Park, Dong-Wook;Yang, Hyun-Won;Kwon, Hyuek-Chan;Hwang, Kyung-Joo;Yoo, Jung-Hyun;Lee, Chi-Hyeong;Kim, Sei-Kwang;Cho, Dong-Jea;Oh, Kie-Suk
    • Clinical and Experimental Reproductive Medicine
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    • v.25 no.1
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    • pp.25-33
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    • 1998
  • Cyclooxygenase (COX) is an enzyme involved in the conversion of arachidonic acid to prostaglandins (PGs), and exists in two forms, COX-1 and COX-2. COX has been reported to be involved in early implantation by secretion of PGs which causes permeability of vessels and reaction of decidual cells around the implantation site. Recently, in mice and sheep studies, COX-1 and COX-2 expression in the endometrium has been reported to be different according to implantation and stages of the estrous cycle, but expression of COX-1 and COX-2 in human endometrium during the menstrual cycle has not yet been established. The purpose of this study was to observe the variances of COX-1 and COX-2 expression by immunohistochemical staining in endometrial samples obtained from human hysterectomy specimens and biopsies of women of reproductive age according to different stages of the menstrual cycle. Also, we attempted to observe COX-1 and COX-2 expression in the epithelial and stromal cells of the endometrium obtained during the mid-secretory phase, which were cultured separately. COX-2 showed a cyclic pattern of expression according to the different stages of the menstrual cycle and was strongly expressed particularly at the mid-secretory phase which corresponds to the time of implantation. However, COX-1 tended to be increased in the early proliferative, and mid- and late secretory phases, but was also expressed in the whole menstrual cycle showing no particular pattern. In the separately cultured cells COX-1 was expressed in epithilial cells and COX-2 in the stromal cells. The above results suggest that since COX-2 is expressed at the same time as implantation and cultured cells display a specific secretory pattern, COX-2 has inductive endocrine enzyme properties and has an important effect on endometrial cells during implantation. Also, COX-2 expression in endometrial cells may be utilized as a useful marker of endometrial maturation.

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Sophoricoside analogs inhibit COX isozymes but not iNOS and TNF in LPS-stimulated macrophages Raw264.7

  • Kim, Byung-Hak;Min, Kyung-Rak;Kim, Young-Soo
    • Proceedings of the PSK Conference
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    • pp.320.2-320
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    • 2002
  • Macrophages activated by lipopolysaccharide (LPS) are known to induce several proinflammatory proteins including COX-2. iNOS and TNF which produce chemical mediators involved in inflammatory response. Sophoricoside and its analogs (genistin, genistein and orobol) from Sophora japonica (Leguminosae) showed differential inhibitory effects on COX-1 and 2 activities. Sophoricoside and genistin shwoed IC50 values of 4 uM and 6 uM on COX-2 activity and of 1,497 uM and 135 uM on COX-1 activity, respectively. Genistein and orobol showed IC50 values of 3 uM on COX-2 activity and of 28 uM and 18 uM on COX-1 activity. respectively. Therefore. the legume isoflavonoids to be selective COX-2 inhibitors. However. sophoricoside and its analogs did not show inhibitory effects of COX-2, iNos and TNF transcripts. which were identified by the RT-PCR.

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Effects of Cyclooxygenase Inhibitors on Vascular Reactivity and Alterations of Cyclooxygenase Expression (혈관 반응성에 대한 Cyclooxygenase 억제제 효과와 Cyclooxygenase 발현 변화)

  • Lee, Ki-Young;Park, Jin-Woo;Eum, Eun-A;Kang, Young-Jin;Lee, Kwang-Youn;Choi, Hyoung-Chul
    • Yeungnam University Journal of Medicine
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    • v.23 no.1
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    • pp.36-44
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    • 2006
  • Background: There is controversy regarding whether COX-2 specific inhibitors are associated with elevation of blood pressure. We compared the effects of aspirin, indomethacin, and celecoxib for vascular reactivity induced by phenylephrine. We also tested the effects of indomethacin and NO donor on COX-1 and COX-2 protein expression, as well as nitrite production in culture medium of vascular smooth muscle cells. Materials and Methods: In this experiment, we used the isometric tension study for vascular reactivity. After 45 minutes of pretreatment with aspirin, indomethacin, celecoxib, and phenylephrine induced contractions were tested. COX-1 and COX-2 protein expressions were analyzed by Western blot and nitrite production by the Griess reaction. Results: Although celecoxib pretreatment caused enhanced arterial contraction, aspirin pretreatment induced more potent arterial contraction than celecoxib in the isometric tension study of rabbit femoral artery. COX-1 protein expression was unchanged by indomethacin, SNP and NOR-3; COX-2 protein expression was increased by the addition of indomethacin, SNP, and NOR-3. Especially, NOR-3, a NO donor, significantly increased COX-2 protein expression with unstimulated conditions as well as LPS stimulation. Induction of nitrite production was higher with NOR-3 treatment than SNP treatment with LPS stimulation. Conclusion: These results suggest that aspirin caused more potent vascular contraction than celecoxib and indomethacin. COX-2 expression in VSMC depended on the types of NO donor and LPS stimulation.

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Activation of p38 MAPK Is Involved in Endothelin-1-stimulated COX-2 Expression in Cultured Feline Esophageal Smooth Muscle Cells

  • Song, Hyun Ju;Min, Young Sil;Shin, Chang Yell;Jeong, Ji Hoon;Sohn, Uy Dong
    • Molecules and Cells
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    • v.22 no.1
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    • pp.44-50
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    • 2006
  • We investigated the possible role of p38 MAPK and $ET_B$ receptors in ET-1 induction of cyclooxygenase-2 (COX-2) and prostaglandin $E_2$ ($PGE_2$) in cultured feline esophageal smooth muscle cells (ESMC). Confluent layers of ESMC were stimulated with 10 nM ET-1 and expression of COX-1 and COX-2, involvement of receptors, and activation of p38 MAPK, were examined by Western blot analysis. Levels of $PGE_2$ induced by ET-1 were measured by Elisa. Using $ET_A$and $ET_B$ antagonists (BQ-123 and BQ-788, respectively), the contribution of the ET receptors to COX-1 and COX-2 expression induced by ET-1 was determined. Western blot analysis revealed that treatment of ESMC with ET-1 resulted in transient expression of COX-2 and activation of p38 MAPK. Activation of p38 MAPK was maximal after 1 h. SB202190, a p38 MAPK inhibitor, reduced expression of COX-2, but not COX-1. ET-1-induced release of $PGE_2$ was also blocked by SB202190. COX-2 expression was upregulated only via the $ET_B$ receptor, and COX-1 expression was not affected by either antagonist. Taken together, our data suggest that ET-1 causes p38 MAPK-dependent expression of COX-2 by interacting with $ET_B$ receptors on ESMC.

Antiinflammatory Evaluation and Synthesis of Benzothiazine Derivatives as Cyclooxygenase-2 Inhibitor (Cyclooxygenase-2 저해제로서의 benzothiazine 유도체 합성과 항염작용 평가)

  • 신혜순;박명숙;권순경
    • YAKHAK HOEJI
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    • v.44 no.3
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    • pp.272-278
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    • 2000
  • The antiinflammatory mechanism of NSAIDs is attributed to the reduction of prostaglandin synthesis by the direct inhibition of cyclooxygenase. Inhibition of prostaglandin production in organs such as stomach and kidney can result in gastric lesions, nephrotoxicity and increased bleeding. In this study, newly designed COX-2 inhibitors, synthesized 1,2-benzothiazine derivatives, were screened in vitro for selectivity of COX-1 and COX-2 inhibition properties. Lead compounds in the structure-activity relationship were studied to synthesize new highly selective COX-2 inhibitors.13 determine inhibitory effect of COX-2, synthesized 1,2-benzothiazine derivatives were screened with accumulation of prostaglandin by lipopolysaccharide (LPS) in aspirin-treated macrophages and murine macropharge cell. Some of synthesized 1,2-benzothiazine derivatives were shown to be effective as selective COX-2 inhibitory activity. Others exhibited a preferential inhibition of COX-2, although some COX-1 inhibitory activity was still present. As a conclusion, simple monomer derivatives were more active than dimer derivatives. Substitution of halogen (Br, C1) on the benzothiazine nucleus slightly enhanced inhibition activity.

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CJ-11668, A new selective and potent COX-2 inhibitor, reduces inflamation, fever and pain in animal models

  • Kim, Seong-Woo;Park, Hyun-Jung;Kim, Young-Gi;Yeon, Kyu-Jeong;Ryu, Hyung-Chul;Park, Sang-Wook;Kim, Jong-Hoon;Ko, Dong-Hyun;Chae, Myeong-Yun
    • Proceedings of the PSK Conference
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    • pp.94.2-94
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    • 2003
  • CJ-11668 is a new potent and selective COX-2 inhibitor. CJ-11668 showed COX-2 inhibition (IC50) of 65nM and selectivity ratio (COX-l/COX-2) of 770 in the cell based assay. In the human whole blood assay, CJ-11668 showed COX-2 inhibition (IC50) of 370nM and selectivity ratio (COX-l/COX-2), 135. The treatment of CJ-11668 (5 mg/kg, p.o) produced a significant inhibition (35%) of inflamed rat paw volume in the carrageenan-induced acute inflammation. CJ-11668 also suppressed the PGE2 level (69% inhibition, 1 mg/kg, p.o) in the zymosan-induced mouse air pouch model after 3 hrs. (omitted)

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