Vioxx Research - Osteoarthritis, Side-effects, Trials, Stroke, Heart Attack

Vioxx Research Today is a free monthly online journal that collates and summarizes the latest research about Vioxx, including details on osteoarthritis, side-effects, trials, stroke, heart attack.


Vioxx Research Today

Home

View Latest Issue

Information About Vioxx

Books on Vioxx

Advertising in Research Today

View Other Research Today Publications



Rofecoxib has different effects on chemokine production in colorectal cancer cells and tumor immune splenocytes.

Walmesley AJ, Zweiri J, Christmas SE, Watson AJ

School of Clinical Sciences, University of Liverpool, Crown St, Liverpool, UK.

Cyclooxygenase-2 (COX-2) is overexpressed in colon tumors. Its main product is the immunosuppressive prostaglandin PGE2 that aids tumor immune escape. In this study, we analyzed mechanisms of action of the COX-2 inhibitor rofecoxib on the immune response to colorectal cancer in an animal model. The murine colorectal cancer cell line MC26, and splenocytes from BALB/c mice immune to irradiated MC26 cells, were incubated with rofecoxib or PGE2. In MC26 cells, 100 nM rofecoxib caused a complete abrogation of PGE2 production and inhibited cell proliferation. Splenocytes from tumor immune mice showed a 300% (P<0.01) increase in proliferation in response to irradiated MC26 cells, amplified to 450% (P<0.01) by 1 microM rofecoxib (n=3). MC26 cells incubated with 1 microM rofecoxib showed increased gene expression of CCL3, CCL5, and CCL20 (P<0.01). enzyme-linked immunosorbent assay tests also showed increased production of CCL5 and CCL20 (P<0.01). PGE2 reversed this effect causing a 40% reduction in chemokine gene expression (n=3). In contrast, splenocytes from naive BALB/c mice stimulated with irradiated MC26 cells had only a marginal chemokine response to rofecoxib. PGE2 caused a 50% down-regulation of CCL5 and CCL20 at the gene level (n=2) and 30% and 40% reduction of CCL3, CCL4, CCL5, and CCL20 at the protein level (n=2). Hence rofecoxib has a 2-fold effect upon the immune response to MC26 cells, by enhancing production of chemokines chemotactic for dendritic cells and also reducing PGE2-mediated inhibition of lymphoproliferation. Together, these may be sufficient for an effective TH1-mediated antitumor response. Rofecoxib may have potential as an addition to existing immunotherapy strategies.

Published 1 August 2007 in J Immunother (1997), 30(6): 614-23.
Full-text of this article is available online (may require subscription).

Place a permanent text-link or advertisement here.

© 2004-2014 Vioxx Research Today. All Rights Reserved.



Vioxx Research Today Archive:

Volume 1 (2004)
  Issue 1 (November)
  Issue 2 (December)

Volume 2 (2005)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 3 (2006)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 4 (2007)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 5 (2008)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 6 (2009)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 7 (2010)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 8 (2011)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 9 (2012)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 10 (2013)
  Issue 1 (January)
  Issue 2 (February)
  Issue 3 (March)
  Issue 4 (April)
  Issue 5 (May)
  Issue 6 (June)
  Issue 7 (July)
  Issue 8 (August)
  Issue 9 (September)
  Issue 10 (October)
  Issue 11 (November)
  Issue 12 (December)

Volume 11 (2014)
  Issue 1 (January)
  Issue 2 (February)



Vioxx Books

Cartilage and Osteoarthritis (Methods in Molecular Medicine)

Cartilage and Osteoarthritis (Methods in Molecular Medicine)