Antiproliferative Effect of NS-398, a Cyclooxygenase- 2 Inhibitor in TPC-1 Thyroid Cancer Cell Line / 대한내분비외과학회지
Korean Journal of Endocrine Surgery
;
: 106-112, 2003.
Article
in Korean
| WPRIM
| ID: wpr-39890
ABSTRACT
PURPOSE:
Cyclooxygenase (COX) enzymes catalyze the ratelimiting step in arachidonate metabolism. COX-1 is expressed constitutively in many cell types. However COX-2 is an inducible enzyme responsible for prostaglandin production at site of inflammation. Recently, there has been increasing evidence that COX-2 involves in development and progression of human tumors. The aim of the present investigation is to evaluate the antiproliferative effect of NS-398, a selective COX-2 inhibitor, and its mechanism in a papillary thyroid cancer cell line, TPC-1.METHODS:
We used TPC-1 cell line, NS-398 and EGF. COX-2 expression was detected by RT-PCR and western blot. We used MTT assay to evaluate antiproliferative effect of NS- 398. The mechanisms of growth inhibition were evaluated by apoptosis assay and cell cycle analysis using flow cytometry.RESULTS:
COX-2 expression was identified by both RT-PCR and western blot in TPC-1 cells and it was upregulated by serum, EGF (10 ng/ml), and NS-398 (50 mM). NS-398 induced a dose-dependent inhibition of cell proliferation but did not increases apoptotic cell population significantly in the TPC-1 cell line. EGF treatment (10 ng/ml) for 72 hours did not seem to change the antiproliferative effect of NS-398. The proportion of G0/G1 cell cycle was increased by 10% compared with control after 36 hours of treatment with NS-398.CONCLUSION:
TPC-1 cells expressed COX-2 constitutively and its expression was upregulated by serum, EGF, and NS-398. The selective COX-2 inhibitor, NS-398 inhibited cell proliferation in TPC-1 cell line rather by cell cycle arrest at G₀/G₁ phase than by inducing apoptosis.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Thyroid Gland
/
Thyroid Neoplasms
/
Cell Cycle
/
Cell Line
/
Blotting, Western
/
Prostaglandin-Endoperoxide Synthases
/
Apoptosis
/
Cell Proliferation
/
Epidermal Growth Factor
/
Cyclooxygenase 2
Type of study:
Prognostic study
Limits:
Humans
Language:
Korean
Journal:
Korean Journal of Endocrine Surgery
Year:
2003
Type:
Article
Similar
MEDLINE
...
LILACS
LIS