Description

Prostate cancer

Description

Celecoxib is a selective COX-2 inhibitor with IC50 of 40 nM.

Targets

IC₅₀

In Vitro

Celecoxib shows low sensitivity against COX-1 with IC50 of 15 μM. ^[1] Celecoxib shows an anti-proliferative effect on nasopharyngeal carcinoma (NPC) cell lines including HNE1 and CNE1-LMP1 with IC50 of 32.86 μM and 61.31 μM, respectively. ^[2]

In Vivo

Celecoxib exhibits a potent, oral anti-inflammatory activity. Celecoxib reduces acute inflammation in the carrageenan edema assay and chronic inflammation in the adjuvant arthritis model with ED50 of 7.1 mg/kg and 0.37 mg/kg/day, respectively. In addition, Celecoxib also exhibits analgesic activity in the Hargreaves hyperalgesia model with ED50 of 34.5 mg/kg. Besides, Celecoxib produces no acute GI toxicity in rats at doses up to 200 mg/kg and no chronic GI toxicity in rats at doses up to 600 mg/kg/day over 10 days. ^[1] In a C3Hf/KamLaw female mouse model, Celecoxib increases median survival time of 105 days (range, 79-145 days) after 13.5 Gy local thoracic irradiation (LTI) alone to 142 days (range, 94-155 days). ^[3]

Clinical Trials

Celecoxib is currently in Phase II clinical trials in patients with recurrent respiratory papillomatosis.

Features

Description

Combination treatment of Celecoxib and dehydroxymethyl-epoxyquinomicin (DHMEQ), an inhibitor of NF-κB produces the synergistic inhibitory effects on cell growth, NF-κB p65 DNA-binding capacity, and cell proliferation in HA22T/VGH and Huh-6 cell lines. ^[4] Combination of SC-560 and Celecoxib shows better antitumor activity with about 35.54% inhibition of tumor growth on human ovarian SKOV-3 carcinoma cells xenograft-bearing mice, while SC-560 and Celecoxib alone only results in inhibition of tumor growth by 13.57% and 15.16%, respectively. ^[5] Combination therapy of Celecoxib and cyclophosphamide is currently in Phase II clinical trials in patients with recurrent or persistent ovarian epithelial, fallopian tube, or primary peritoneal cancer.

COX enzyme assay in vitro

Expression of COX protein in insect cells is determined by assessing PG-synthetic capability in homogenates from cells incubated for 3 days with COX-1 or COX-2 baculovirus. Cells expressing COX-1 or COX-2 are homogenized and incubated with arachidonic acid (10 μM). COX activity is determined by monitoring PG production. No COX activity is detected in mock-infected Sf9 cells. Celecoxib are preincubated with crude 1% CHAPS homogenates (2-10 μg of protein) for 10 minutes before addition of arachidonic acid. PGE2 formed is detected by ELISA after 10 minute incubation.

Cell Lines

HNE1 and CNE1-LMP1

Concentrations

0-75 μM

Incubation Time

48 hours

Methods

The antiproliferative effect of Celecoxib on NPC cells is assessed using an MTT assay. Cells are seeded into 96-well plates and allowed to attach for 24 hours. The cells are then treated with increasing concentrations of Celecoxib (0 to 75 μM) dissolved in DMSO (final concentration ≤0.1%) and incubated for up to 48 hours. After the incubation, 20 μL of MTT dye (5 mg/mL) are added to each well and cells are incubated at 37 °C for 4 hours. After removing the supernatants, the crystals are dissolved in DMSO and the absorbance is measured at 490 nm. The half-maximal inhibitory concentration (IC50) values and the 95% confidence intervals are calculated using probit regression using SPSS 15.0 software. The experiment is performed in triplicate and repeated at least three times.

Animal Models

A 0.1 mL aliquot of a 1% solution of carrageenan in 0.9% sterile saline or 1 mg of Mycobacterium butyricum in 50 μL of mineral oil is administered to the right hind foot pad of male Sprague?Dawley rats.

Formulation

Celecoxib is dissolved in 0.5% methyl cellulose and 0.025% Tween-20.

Doses

≤200 mg/kg

Administration

Administered via p.o.