Antiproliferative Effect of NS-398, a Cyclooxygenase- 2 Inhibitor in TPC-1 Thyroid Cancer Cell Line.
10.16956/kjes.2003.3.2.106
- Author:
Guang Bi JIN
1
;
Jin Woo PARK
;
Hyo Yung YUN
;
Lee Chan JANG
;
Jae Woon CHOI
Author Information
1. Department of Surgery, Chungbuk National University College of Medicine, Cheongju, Korea. jwpark@med.chungbuk.ac.kr
- Publication Type:Original Article
- Keywords:
Cyclooxygenase-2;
Antiproliferation;
Cell cycle arrest;
Apoptosis
- MeSH:
Apoptosis;
Blotting, Western;
Cell Cycle;
Cell Cycle Checkpoints;
Cell Line*;
Cell Proliferation;
Cyclooxygenase 2;
Epidermal Growth Factor;
Flow Cytometry;
Humans;
Inflammation;
Metabolism;
Prostaglandin-Endoperoxide Synthases;
Thyroid Gland*;
Thyroid Neoplasms*
- From:Korean Journal of Endocrine Surgery
2003;3(2):106-112
- CountryRepublic of Korea
- Language:Korean
-
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.
