PROSTAGLANDINS
Prostaglandins (PGs) are made by virtually all cells from the phospholipids of their cell
membranes. They differ from other hormones in that they do not circu-late in
the blood to target organs, but rather exert their effects locally, where they
are produced.
There are many
types of prostaglandins, designated by the letters A through I, as in PGA, PGB,
and so on. Prostaglandins have many functions, and we will list only a few of
them here. Prostaglandins are known to be involved in inflammation, pain
mechanisms, blood clotting, vasoconstriction and vasodilation, contrac-tion of
the uterus, reproduction, secretion of digestive glands, and nutrient
metabolism. Current research is directed at determining the normal functioning
of prostaglandins in the hope that many of them may eventually be used
clinically.
One familiar
example may illustrate the widespread activity of prostaglandins. For minor
pain such as a headache, many people take aspirin. Aspirin inhibits the
synthesis of prostaglandins involved in pain mech-anisms and usually relieves
the pain. Some people, however, such as those with rheumatoid arthritis, may
take large amounts of aspirin to diminish pain and inflammation. These people
may bruise easily because blood clotting has been impaired. This too is an
effect of aspirin, which blocks the synthesis of prostaglan-dins necessary for
blood clotting.
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