Hey all,
I’ve been lurking here for several years & finally decided to post. While I can’t answer the OP, there are a few subsequent points that should be cleared up.
In the late 70s, Sir John Vane (Nobel Prize in Medicine, 1982) discovered that aspirin attenuated inflammation via the inhibition of cyclooxygenase (COX). To date, three isoforms of COX have been identified (COX1, COX2, and COX3). Aspirin inhibits both COX1 and COX2 (as does ibuprofen, but via a totally different mechanism). Unfortunately, while this has anti-inflammatory effects, it is also responsible for the gastrointestinal problems (e.g. gastric erosions) associated with NSAIDS. The mechanism of action of acetaminophen, on the other hand, is not well understood. It is believed that it may inhibit COX3, which seems to be selectively expressed in the brain.
This is a little misleading. Cyclooxygenases catalyze the formation of prostaglandin H2 (PGH2), which can then be used as a substrate to produce various other prostaglandins and thromboxanes. And yes, the inhibition of COX1 and COX2 can lead to the inhibition of various cytokines. However, this is a gross oversimplification of what’s going on. Whether a given prostaglandin or cytokine (and there’s LOTS of them) acts in an anti- or pro-inflammatory manner is dependent on its concentration, location, the cell type secreting it, and a whole host of other factors.
This is sort of true. However, the new players in the field, Celebrex and Vioxx, are selective COX2 inhibitors. The thinking is that, because COX1 is constitutively expressed while COX2 is upregulated during inflammation, that inhibiting COX2 but not COX1 will attenuate inflammation while sparing the GI tract. Of course, things are not nearly as simple as that. Pfizer covered up the fact that Celebrex does not differ from conventional NSAIDs in its GI toxicity. Merck covered up the fact that Vioxx can cause serious thrombotic events. But hey- whatever makes a buck.
Sorry for this long-winded post, but it’s an area in which I’m interested. Bottom line: inflammation is your body’s way of trying to deal with a problem. If the problem is as simple as a headache, I suggest you stay away from NSAIDs entirely. Works for me.
-Apoptosis
Here are a few links (although I would really recommend looking for papers by J Vane or J Wallace on PubMed):
Basic stuff- http://www.nsaid.net/
Pfizer lies (scroll down a couple pages)- http://www.who.int/medicines/library/pnewslet/3news2002.pdf
Merck lies (page 13)-
http://www.who.int/druginformation/vol16num1_2002/vol16-1.pdf