To investigate the relationship between the expression of cyclooxygenase-2 (COX-2) and menstrual cycle, the regulatory effects of 17-beta-estradiol (E(2)) and medroxyprogesterone acetate (MPA) on the expression of COX-2 in cervical cancer Hela cells were examined. Cervical cancer specimens were obtained from 47 pre-menopausal patients. The phase of menstrual cycle was determined by case history and HE staining of uterine endometrium. COX-2 was immunohistochemically stained by SABC staining and the staining intensity was determined with computerized image analysis system. Hela cells were incubated with alcohol, E(2), E(2)+MPA, MPA for 12, 24 and 48 h respectively. The expression of COX-2 in Hela cells was detected by Western blotting and reverse transcriptase-polymerase chain reaction (RT-PCR). Our results showed that the expression of COX-2 was significantly higher during proliferative phase than secretory phase (P<0.05), but there was no difference in the positive rate between proliferative phase and secretory phase (P>0.05). Incubation with E(2) could significantly enhance the expression of COX-2 continually. On the contrary, E(2)+MPA and MPA alone could decrease the expression of COX-2 as compared with the control and E(2) group (P<0.05 and P<0.01 respectively). It is concluded that the expression of COX-2 in cervical cancer of pre-menopausal patients and Hela cells was regulated by estrogen/progestogen.
Cyclooxygenase 2/genetics ; Cyclooxygenase 2/*metabolism ; Estradiol/*pharmacology ; Hela Cells ; Medroxyprogesterone Acetate/*pharmacology ; Uterine Cervical Neoplasms/*enzymology

To investigate the expression of cyclooxygenase-2 (COX-2) in ovarian cancer cell lines, RT-PCR and immunocytochemistry were used to detect the expression of COX-2 in 5 ovarian cancer cell lines. The expression of COX-2 mRNA and protein was detected in all 5 cell lines. It is suggested that COX-2 is expressed in ovarian cancer cell lines, which provides a basis for the chemoprevention of ovarian cancer.
Cell Line, Tumor ; Cyclooxygenase 2/genetics ; Cyclooxygenase 2/*metabolism ; Ovarian Neoplasms/*enzymology ; Ovarian Neoplasms/*pathology ; RNA, Messenger/genetics ; RNA, Messenger/metabolism

AIMTo study the effect of chronic hypoxic hypercapnia on expression of COX-2 mRNA in pulmonary arterioles.

METHODSSD rats were randomly divided into two groups: control group and hypoxic hypercapnic group. COX-2 mRNA was observed in pulmonary arterioles by the technique of in situ hybridization.

RESULTSmPAP, weight ratio of right ventricle (RV) to left ventricle plus septum (LV + S) and COX-2 mRNA in pulmonary arterioles were much higher in rats of hypoxic hypercapnic group than those of control group. Light microscopy showed that vessel smooth muscle cell hypertrophy and vessel cavity straightness were found in hypoxic hypercapnic group.

CONCLUSIONChanges of expressions of COX-2 mRNA may regulate hypoxic hypercapnic pulmonary hypertension.

Animals ; Cyclooxygenase 2 ; genetics ; metabolism ; Hypercapnia ; metabolism ; physiopathology ; Hypoxia ; metabolism ; physiopathology ; Male ; Pulmonary Artery ; metabolism ; physiopathology ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo construct a miR-155-based lentivirus vector to induce cyclooxygenase-2 gene silencing in nasopharyngeal carcinoma (NPC) cells by expressing anti-COX-2 shRNAmir.

METHODSmiR-155-based anti-COX-2 shRNAmir template was synthesized and inserted into pLVTHM plasmid. The recombinant pLVTHM/shRNAmir was transfected into 293FT cells for packaging the lentivirus vector. After infection with the lentivirus vector, the GFP-positive cells were screened by flow cytometry, and COX-2 mRNA level was detected by RT-PCR.

RESULTSRestriction digestion and DNA sequencing confirmed successful construction of the anti-COX-2 vector pLVTHM/shRNAmir. A subline of C666-1 cells was established after infection with the lentivirus vector, and the COX-2 expression in the cells was stably silenced.

CONCLUSIONThe shRNAmir lentivirus vector constructed may serve as an effective COX-2 inhibitor, which may facilitate future studies of gene therapy of NPC.

Cell Line, Tumor ; Cyclooxygenase 2 ; genetics ; Genetic Vectors ; genetics ; Humans ; Lentivirus ; genetics ; metabolism ; MicroRNAs ; genetics ; Nasopharyngeal Neoplasms ; genetics ; metabolism ; pathology ; RNA Interference ; RNA, Small Interfering ; genetics ; Transfection

OBJECTIVE: To investigate the expression of COX-2 in both molecule and protein levels in laryngeal squamous cell carcinoma and the relationship between its intensity and histological grade, clinical stage and lymphoma metastasis. METHOD: By using emi-quantify RT-PCR and Immunohistochemistry, the expression of the COX-2 mRNA and COX-2 protein in laryngeal squamous cell carcinoma and polyp of vocal cord were examined. RESULT: Compared with the polyp of vocal cord tissue, the expression level of COX-2 mRNA and COX-2 protein in human laryngeal squamous cell carcinoma were significantly increased (P < 0.01). The intensity of COX-2 mRNA and protein expression increased as the laryngeal squamous cell carcinoma progresses developed. CONCLUSION COX-2 is high expressed in human laryngeal squamous cell carcinoma, and it may play an significant role in the growth, invasion and metastasis of human laryngeal squamous cell carcinoma. A combination of emi-quantify RT-PCR and immunohistochemistry is sensitive and specific for laryngeal neoplasms detection.
Adult ; Aged ; Carcinoma, Squamous Cell ; genetics ; metabolism ; pathology ; Cyclooxygenase 2 ; genetics ; metabolism ; Female ; Humans ; Laryngeal Neoplasms ; genetics ; metabolism ; pathology ; Male ; Middle Aged ; RNA, Messenger ; genetics

Animals ; Cyclooxygenase 2 ; biosynthesis ; genetics ; Female ; Liver Diseases, Alcoholic ; metabolism ; Male ; NF-kappa B ; biosynthesis ; genetics ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo investigate the expression of cyclooxygenase-2 (COX-2) in different prostate cancer (PCa) cell lines and its role in the acquisition of invasive and metastatic potentials of PCa.

METHODSWe detected the expressions of COX-2 in prostate cancer cell lines LNCaP, C4-2, IF11, IA8 and PC-3 with different metastatic potentials by Western blotting and RT-PCR, and analyzed their roles in the invasion and metastasis of different PCa cell lines.

RESULTSWestern blotting and RT-PCR showed that the expression of the COX-2 protein was high in PC-3, but absent in IF11, IA8, LNCaP and C4-2 (P < 0.05), and it was consistent with the expression of COX-2 mRNA.

CONCLUSIONCOX-2 expresses differently in PCa cell lines with different metastatic potentials. The overexpression of COX-2 may be associated with the high invasion and metastasis of PC-3, but not with the metastasis of other cell lines.

Cell Line, Tumor ; Cyclooxygenase 2 ; metabolism ; Humans ; Male ; Neoplasm Metastasis ; Prostatic Neoplasms ; metabolism ; pathology ; RNA, Messenger ; genetics

OBJECTIVETo investigate the expression of cyclooxygenase-2(COX-2) and CEA in the tissues adjacent to the tumor within different distances.

METHODSA total of 42 colorectal cancer tissues were collected.The adjacent tissues within 3 cm to the tumor were procured every 1 cm. Normal tissue was also collected. RNA was extracted and the expression of CEA and COX-2 was detected by RT-PCR.

RESULTSThe CEA mRNA levels of the tumor, the tissues of every 1 cm adjacent to the tumor, and the normal tissue were 135.2 ± 23.3, 78.2 ± 17.3, 75.9 ± 16.5, 56.2 ± 10.7, 52.3 ± 12.8, 18.2 ± 7.9, 16.2 ± 6.5, and 16.6 ± 7.0. The levels of COX-2 mRNA in above positions were 134.9 ± 31.1, 79.2 ± 20.2, 77.0 ± 20.5, 62.7 ± 21.9, 58.0 ± 18.1, 21.2 ± 10.3, 18.3 ± 7.6, and 17.1 ± 6.3. These data showed a decreasing trend of CEA and COX-2 as the distance increased from the tumor. The CEA mRNA levels showed positive correlation with the levels of COX-2 mRNA(r=0.725, P<0.01).

CONCLUSIONCEA and COX-2 may be considered to be used as biomarkers for the study of molecular resection margin of colorectal cancer.

Adult ; Aged ; Carcinoembryonic Antigen ; metabolism ; Colorectal Neoplasms ; genetics ; immunology ; pathology ; Cyclooxygenase 2 ; metabolism ; Female ; Humans ; Male ; Middle Aged ; Neoplasm Staging

OBJECTIVETo investigate the effect of p38 mitogen-activated protein kinase (p38MAPK) on the expression of COX-2 and caspase-3 in the substania nigra (SN) of mice with MPTP-induced Parkinson disease (PD).

METHODSC57BL/CN mice were treated with MPTP to prepare a subacute PD model, and their behavioral changes following the treatment were observed. Immunohistochemistry and Western blotting were performed to detect the expression of tyrosine hydroxylase (TH), COX-2 and phosphorylation of P38MAPK in the SN and their changes following treatment with SB203580, a specific inhibitor of P38MAPK.

RESULTSThe 7-day model group showed typical symptoms of PD with decrements of TH-positive neurons and TH protein level in the SN of the midbrain by about 65% and 75%, respectively (P<0.01). In the 3-day model group, the COX-2-, caspase-3- and phosphorylated P38MAPK-immunoreactive cells and their protein levels in the SN increased markedly with obvious loss of TH-positive neurons. Administration of SB203580 obviously lessened the above changes (P<0.01).

CONCLUSIONP38MAPK regulates the inflammation and apoptosis in the SN of the mouse model of subacute PD, and SB203580 may provide some neuroprotective effect.

Animals ; Caspase 3 ; genetics ; metabolism ; Cyclooxygenase 2 ; genetics ; metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Parkinson Disease ; metabolism ; Signal Transduction ; Substantia Nigra ; metabolism ; p38 Mitogen-Activated Protein Kinases ; metabolism

In order to study the expressions of vascular endothelial growth factor (VEGF) and cyclooxygenase-2 (COX-2) in human laryngeal squamous cell carcinoma (LSCC) and its significance, the expression of VEGF mRNA and COX-2 mRNA in 62 cases of LSCC and 54 adjacent noncancerous laryngeal tissues and 9 normal human laryngeal mucous tissues was detected by using techniques of semi-quantitative RT-PCR. It was found that the expression level of VEGF and COX-2 mRNA was significantly increased in LSCC as compared with that in the normal human laryngeal mucous tissues (both P < 0.01), and the expression level of VEGF and COX-2 mRNA were significantly increased in stage Ill + IV tissues of LSCC as compared with the stage I + II tissues of LSCC (P < 0.01). There was a high positive correlation between VEGF and COX-2 expression in LSCC (r = 0.756, P < 0.01). These data raise the possibility that VEGF and COX-2 may play key roles in the growth, invasion and metastasis of LSCC.
Carcinoma, Squamous Cell/*metabolism ; Cyclooxygenase 2/*biosynthesis ; Cyclooxygenase 2/genetics ; Laryngeal Neoplasms/*metabolism ; RNA, Messenger/biosynthesis ; RNA, Messenger/genetics ; Tumor Markers, Biological ; Vascular Endothelial Growth Factor A/*biosynthesis ; Vascular Endothelial Growth Factor A/genetics