Vaccine Could Protect Against Stroke And Epilepsy Essays

Vaccine Could Protect Against Stroke And Epilepsy Essays Vaccine Could Protect Against Stroke And Epilepsy Vaccine Could Protect Against Stroke And Epilepsy Damage February 25, 2000 A new oral vaccine has offered new hope because of its effectiveness in protecting laboratory rats against brain damage from epilepsy and stroke, and might one day be used to help humans with the same conditions. The vaccine blocks a protein in the brain called NMDA, but does so only when epilepsy or stroke occur. The vaccine is released in the brain as needed and is protected from any side effects. During and colleagues immunized another group of rats and after five months induced stroke in them by blocking an artery in the brain. The rats still experienced strokes, but the size of the brain damage was 70 percent less in immunized rats compared with animals that didn't receive the treatment. This concept could be useful in treating other neurological disorders as well. NMDA is a receptor that responds to the chemical glutamate in the brain, the glutamate/NMDA complex is responsible for many normal brain functions like the development of neurons, learning and memory. Blocking the NMD A receptor in general could have damaging effects. However, the NMDA receptor is also involved in a chain of events that contribute to neurological damage from epilepsy, stroke and head injuries. To create the vaccine, the researchers added the gene that codes for the NMDA receptor to a virus. When this gene and virus combination enter the animal's bloodstream, the immune system creates antibodies to both the virus and NMDA. These antibodies circulate in the blood, but are prevented from entering the brain by the blood brain barrier, a tightly packed group of cells that line blood vessels in the brain. The blood brain barrier is a protective mechanism that prevents many large molecules, such as these antibodies, from entering the brain. Yet during times of neurological insult, like epilepsy and stroke, the blood brain barrier is compromised, and the antibodies do enter the brain. They then seek out and block the NMDA receptor, preventing some brain damage from occurring. Soon afterw ards, the blood brain barrier is restored, and the antibodies no longer have an effect on the brain. The biotechnological aspect of this article is evident because of the lengthy research and use of lab rats to secure the validity of this new approach to reduce the risk of brain damage after seizures or strokes. The scientists involved first isolated a receptor in the brain, understood its functions, and then found a way to block its effects that can be detrimental to the brain after a stroke. Although this new form of treatment has not been tested on humans, I believe that this will lead to some very helpful discoveries. The potential this treatment has is immense and usefulness unknowable. If one of my family members were to have a stroke and come out nothing like his/her former self I would certainly wish that there had been something to prevent the brain damage from occurring. Vaccine Could Protect Against Stroke And Epilepsy Damage February 25, 2000 An oral vaccine has proven to be effective in protecting laboratory rats against brain damage from epilepsy and stroke, and might one day be used to help humans with the same conditions. The vaccine blocks a protein in the brain called NMDA, but does so only when epilepsy or strokes occur. Therefore, the brain is helped by the vaccine in times of need, yet is protected from any side effects like deficits in movement, learning and memory that could result from blocking NMDA during normal brain functioning. ''We've known for a long time about the mind-body connection how the brain talks to the immune system,'' said Dr. Matthew During, professor of neurosurgery at Jefferson Medical College in Philadelphia. ''Here, we're saying the opposite the immune system talks to the brain and that can be used as a very powerful tool, almost a scalpel, to target specific receptors in the brain.'' The researchers, led by During, began by giving the vaccine to 100 rats, and a month later, induced epile ptic-like seizures in them with a drug called kainate. Although normally 70 percent of rats given kainate would have seizures, only 20 percent of the rats that were

The Surfeit of Weird Exceptions to the I-Before-E Rule

The Surfeit of Weird Exceptions to the I-Before-E Rule The Surfeit of Weird Exceptions to the I-Before-E Rule The Surfeit of Weird Exceptions to the I-Before-E Rule By Mark Nichol In the chaos of spelling of the English language, some rules provide comfort until you realize that the number of exceptions renders a rule nearly useless as a memory aid. Such is the case with the rule that in vowel pairs, i comes before e except when the pairing follows c. The pairing ie is the default setting: Believe, die, and friend are just a few of the many words that follow the rule. However, exceptions are numerous, as exemplified in the sentence â€Å"Seize their eight feisty neighbors being weird.† And although the order after c is often ei (ceiling, deceit, receive), the order is often inverted (science, species, sufficient). To be more useful, the rule should continue, â€Å"or when pronounced like a long a, as in weigh or like a long e.† The rule that i comes before e except after c is contradicted by the fact that more than twenty times as many words have the letter sequence cie as the sequence cei, so that’s not a very useful rule. Also, the sequence ei often does not follow c. This is true in many categories of words, including the following ten groups: proper names, such as Keith chemical names like caffeine words in which ei is pronounced like a long e, such as leisure (many exceptions, such as piece) words in which ei is pronounced like a schwa (a weak â€Å"uh†), such as forfeit words in which ei is pronounced like a long a, such as weigh (this sound is never spelled ie, except in the American English pronunciation of lingerie) words in which ei is pronounced like a long i, such as height (exceptions include die) rare cases of ei pronounced, for example, like a short a, such as heifer words in which the vowel-and-consonant sound rhyming with ear is pronounced, such as weird (exceptions include pierce) words in which the vowel-and-consonant sound rhyming with heir is pronounced, such as their (this sound is never spelled ier) words in which e and i are each part of a separate syllable (albeit, being, reignite) Ultimately, it may be wise to forget that such a rule exists and always check spelling of words that may have an ie or an ei combination. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Spelling category, check our popular posts, or choose a related post below:60 Synonyms for â€Å"Walk†Telling a Good Poem from a Bad OneMood vs. Tense