If you've ever had to have surgery, whether it is major or minor, you may have been prescribed a painkiller to ease the pain of the first few post-op days, when the pain is most intense. Often, these prescription painkillers are synthetic opiate derivatives such as hydrocodone, which mimics natural opiates found in plants such as poppies. How this works is that the opiate compounds are ingested, metabolized and then bind to opiate receptors in the brain, which sends signals of relief to wherever the pain is felt.
Unless you are female, and then you require a bit more of the same drug to elicit the same pain relief response than your male counterparts. Why is this, and why is this important?
An interesting study out of Georgia State University has demonstrated that in female rats, morphine's pain-relieving effects are not nearly as potent as they are in male rats due to the distinct lack of opioid receptors in a certain part of the brain, where they are found in high concentrations in male rats. This is interesting and significant for several reasons.
First, opiate compounds are highly addictive and are capable of causing physical drug dependence in those who take them, even in the short term, for pain relief. Such was the case with Heath Ledger, whose untimely death last January was the result of an overdose of medications derived from opiate compounds mixed with other prescription medications. The evidence the Georgia State researchers have demonstrating that male rat brains have more opiate receptors than do female rat brains is significant here because a link to gender and opiate addiction could be made. However, unless the same experiments are performed in human beings, this hypothesis may remain untested.
A major stumbling block here is the presence of estrogens, which women obviously produce in far greater quantities than their male counterparts. The GSU researchers found that the presence of estrogens affected how the rats responded to pain. Rats with high estrogen levels responded quickly to pain once morphine had been administered to them, while rats whose estrogen levels were low (males, and low-estrogen secreting females) responded more slowly once morphine had been administered, demonstrating that the presence of estrogen definitely affects the efficacy of opiate compounds as analgesics.
So, how can the work that the GSU researchers help us to understand pain relief and the seeming inequity that women face in finding relief from opiate compounds? How can this work shed light on the scourge of drug addiction, and more importantly, how can this work be used to help healthcare professionals treat addiction more effectively? Could this work be used to drive the development of alternative analgesics which do not depend on opioid receptors in the brain?
Posted by scienceguru on January 4, 2009
Tags better living through biochem, discuss, research, science and society


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