Tysabri Lawsuit News (2/16/12): A Tysabri Lawsuit is a possibility for those who were diagnosed with PML, a disease affecting the white matter of the brain. Tysabri is used to treat relapsing forms of multiple sclerosis and Crohn’s disease, and in January 2012 the FDA updated safety information regarding the link between Tysabri and PML. PML is a rare but serious brain infection associated with the use of Tysabri. If you suffered from this condition, please call Best Legal Source to discover your legal options including a possible Tysabri Lawsuit. You can get in touch with a Tysabri Lawsuit attorney by calling (800) 611-7080 or messaging us through the contact form to your right.
There is an active FDA safety alert in place for Tysabri. A Tysabri Lawsuit may be beneficial if you are faced with a brain infection that will create expensive hospital visits and cause serious damage to your health. The drug label has recently been revised to list the risk factors of Tysabri. If you took this drug prior to these safety alerts, you may want to pursue a Tysabri Lawsuit.
A Tysabri Lawsuit may be especially relevant to those who were PML victims. According to the FDA, you are especially at risk for PML if you test positive for anti-JC virus antibodies. You are also at a greater risk for PML if you have taken Tysabri for longer than 2 years or had prior treatment with immunosuppressant medication.
The phrase Tysabri Lawsuit is used descriptively and is not meant to claim ownership of the drug Tysabri. The mission of Best Legal Source is to help victims get in touch with legal professionals such as Tysabri Lawsuit lawyers.
Best Legal Source is a company that specializes in helping connect injured parties with qualified attorneys. If you are in need of a Tysabri Lawsuit attorney, call us today for assistance. We are experienced in helping victims of pharmaceutical companies through the process of litigation like the Tysabri Lawsuit. Time is vital in most legal situations. Start the process today.
Tysabri Lawsuit News – 2/22/2012: You deserve to be compensated if you took Tysabri and suffered side effects that the public was not warned about. Contact us today and we will arrange a free consultation with a lawyer experienced in pharmaceutical and medical device ligation that can advise you of your legal rights.
Tysabri Lawsuit : Glia outnumber neurons six to one, but the exact ratio differs in different parts of the nervous system. Just as the ratio of men to women is one to one on average, the exact ratio of men to women ranges widely in different areas. For example, the sex ratio maybe ten men to one woman in barbershops and just the opposite in fabric stores. Along nerves or in white matter tracts in the brain, the ratio of glia to neurons can be one hundred to one, because one axon can be ensheathed by myelin-forming glial cells spaced roughly one millimeter apart along the full length of the axon. In the human frontal cortex, the ratio of astrocytes to neurons is four to one, but whales and dolphins have seven astrocytes for every neuron in their gigantic forebrains. This glia to neuron ratio is larger than seen in the frontal cortex of any other mammal. No one knows why this is the case. Whales and dolphins are highly social creatures and very intelligent. Perhaps, as with Einsteins cortex, the larger proportion of glia somehow contributes to the animal’s obvious intelligence. But whales may also need more abundant glial cells to sustain their neurons in a healthy state during their long breath-holding dives to the ocean depths.
Small-diameter axons are not studded with Schwann cell “pearls,” yet they are not naked. These tiny axons are cabled together by huge globular cells grasping bunches of slender axons like a fistful of spaghetti. The anatomists called these fist-like cells “nonmyelinating” Schwann cells, to distinguish them from the pearl-type “myelinating” Schwann cell. These protective non myelinating Schwann cells assure that none of the most fragile slender axons in nerves are ever left bare. The nonmyelinating Schwann cells also undermine the clever idea that axons are formed in embryonic development by connecting together Schwann cells to form the axon tube, because one nonmyelinating Schwann cell engulfs a dozen or more small-diameter axons inside itself. Some pioneering neuroscientists suspected that these glial cells in our nerves must have a hidden function, but what the function might be was unclear.
When an axon reaches its target—for example, the synapse onto a muscle fiber that will make the muscle twitch—the entire tip of the axon is completely engulfed by another glial cell that seals off the nerve junction like shrink wrap. This cell is called the “terminal” Schwann cell or “perisynaptic” Schwann cell (“perisynaptic” meaning “surrounding the synapse”). Until recently this was essentially the function most scientists presumed it served: sealing off the nerve ending. In recent years, that naive view has crumbled with the discovery that these terminal Schwann cells can sense and control information flow from nerve to muscle.
For now we should understand that Schwann cells come in three basic types: (1) myelinating, (2) nonmyelinating, and (3) terminal. Although these cells look completely different, they are all called Schwann cells simply because early anatomists recognized that none of them was a type of nerve cell. As will become apparent, each of these Schwann cells performs entirely different functions, and our nerves will fail to work properly if any one of them is defective. This static picture belies the dynamic nature of Schwann cells: they react with rapid changes in their structure and undergo cell division in response to nerve injury Schwann cells must perform all the functions of the various specialized glia found in the central nervous system (CNS).
Schwann cells were ignored for decades because there was no reason to imagine that they could have any function in information flow through our nerves, but the mystery of what I had just seen was before me on the computer screen: Schwann cells all along the axon in our experiment had somehow detected impulses flowing through the nerve fiber. How were the Schwann cells picking up the signals from electrical impulses in the axons? An even more intriguing question was, why would Schwann cells all along the axon need to tap into the information flowing through the nerve cell? And what would they do with the information they gleaned? These questions lay ahead of us as I flipped off the switch and watched the Schwann cell lights dim slowly, returning the screen to the shadowy darkness of silent neurons.
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Tysabri Lawsuit: The early anatomists looked closely for cells resembling Schwann cells inside the brain and spinal cord, but without success. Ultimately, however, the search led to the discovery of oligodendrocytes. These were the last glial cells discovered, and these odd brain cells were a great puzzle to anatomists. Like astrocytes, these glial cells are found only inside the brain and spinal cord, never in the nerves of our body. When the mystery of oligodendrocytes was finally solved, the most widely appreciated and intricate form of neuron-glia interaction was revealed—an elegant partnership between axon and glia that is absolutely essential for high-speed impulse conduction. This is myelin.
Oligodendrocytes are seen almost everywhere in the brain, but they are especially numerous in white matter tracts. White matter streaks through the core of the brain of animals with backbones (fish, amphibians, reptiles, birds, mammals, and humans). This white matter consists of the information trunk lines formed by thousands of axons bundled together to carry information between distant parts of the brain. Under a microscope, anatomists could easily see why the trunk lines were sparkling white. Each axon was coated with a substance that reflected light brilliantly. In the focused beams of the light microscope, an axon looks like the branch of a tree encased in a crystalline sheath of ice deposited in a winter storm.
Vertebrates have a far more complex nervous system than invertebrates. The vertebrate nervous system is also centralized, that is, concentrated into a brain and spinal cord. In lower animals like crabs or slugs, neurons are bunched together like grapes wherever they are needed. There are clusters of neurons at each segment of the articulated tail of a lobster and knots of neurons near the mouth parts of slugs to operate structures for feeding, for example. But in animals with backbones, the brain is concentrated into one massive supercomputer encased inside a thick armor of bone. The backbones of vertebrate animals protect their vital spinal cord. This cerebral concentration of brain power and complexity could not have occurred without this fundamental difference in glia separating vertebrates from invertebrates. Glia—not neurons—are responsible for this biological revolution.
Some invertebrates, such as squid, which can move quickly, have developed an ingenious method to overcome the absence of myelin. Through the course of evolution, squid and some other invertebrates have greatly enlarged the diameter of critical axons that are essential for the life-saving reflexes needed to escape predators. The principle is simple: you can get more water through a fire hose than a garden hose, even if both are leaky. The giant axons in squid are so enormous that they can be seen with the naked eye as you clean squid in preparing calamari for dinner. They look like damp cotton strings about a millimeter in diameter, stuck to the underside of the squid mantle, which is the fleshy part of the squid. The mantle is designed to squeeze quickly like the rubber bulb of a turkey b as ter. The spurt of water squirting out a small opening propels the squid suddenly to escape a predator. The giant axons offer less resistance to electric current, enabling more rapid flow of nerve impulses to trigger this quick escape from a predator s jaws.
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Tysabri Lawsuit: The brains isolation behind the blood-brain barrier deprives it of access to the vital immune system that fights infection and disease, for the immune cells circulating in our blood and lymph do not penetrate the tightly sealed walls of blood vessels in the brain and spinal cord. How then does the brain resist attack by microorganisms and toxins?
The answer is that the brain has its own exclusive guard, a special class of glial cells called microglia, the smallest and most dynamic of all glia. Each microglia can transform from a latent multi branched solitary cell into a highly mobile amoeboid cell when it detects the danger of infection or injury Squeezing between tangles of dendrites and axons as they rush to kill the invader, microglia attack and devour any harmful organism. These cells are no doubt tunneling through your brain at this very moment like tiny worms through fertile garden soil. Their mission accomplished, they transform back again into stationary multibranched cells, camouflaged like the apple-throwing guard trees in The Wizard of Oz, looking like just another part of the landscape.
These microglia, “microglue cells,” constitute 5 to 20 percent of the entire glial population in the brain. This means that there is nearly one microglial cell for every neuron. Each neuron has, in effect, its own private bodyguard. Some of these cells wrap themselves around a particular neuron, protecting it like a Secret Service agent shielding the president from a bullet. So stealthy in their disguise are these quick-change artists that fifteen years ago, scientists were still debating whether they existed. Dr. Alois Alzheimer, who described the degenerative disease that now bears his name, encountered these cells in his studies of diseased brains. He studied them with intense interest because they accumulated in large numbers around the senile plaques in brain tissue that are the hallmark of Alzheimer’s disease.
Microglia will track down and pounce on a bacterium, virus, or cellular debris and devour it, but they also attack using chemical weapons. Some of the chemical agents they release—for example the excitatory neurotransmitter glutamate, cytokines, reactive oxygen, and nitrogen species—are particularly harmful to neurons in high concentrations. Like all defending armies and soldiers, microglia are both saviors and potential enemies. Collateral damage caused by microglia is the source of many neurological disorders. They also carry out mercy missions, bringing aid to neurons by dispensing neuroprotective chemicals to injured nerve cells.
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Tysabri Lawsuit: The many branches of these bushy cells are encrusted with an array of cell sensors always on the lookout for signals of danger and disease. They have receptors for immunological recognition molecules, beacons of self and nonself that identify foreign cells invading the brain. They also have certain sensors like those on neurons (neurotransmitter receptors and ion channels) that allow microglia not only to detect invading cells and toxic conditions, but also to monitor neuronal function and remain alert to possible neuronal distress.
Considering their armament of toxic weapons, their array of sensors that can respond to disease and monitor neuronal states, and their ability to secrete healing proteins that repair neurons, microglia deserve closer attention. As we’ve seen, microglia are equipped with powerful enzymes that enable them to cut through the matrix of proteins that bind cells into a tissue as they rush to attack an invading organism. There is evidence that they can also apply these weapons to strip synaptic connections from neurons—not only in disease, but also in rewiring circuits in learning. Microglia, it appears, maybe able to unplug the connections between neurons.
Astrocytes are everywhere in the brain and spinal cord, but they are not present in the nerves of the peripheral nervous system. They are found in the optic nerve because the eye forms during embryonic development as a swelling growing out from the brain, and it is in fact part of the brain. Astrocytes support neurons in several ways. They provide a physical matrix for structural support, they deliver energy to neurons and remove their waste products, and they react to brain injury by forming scars. Like all living cells, astrocytes have an electrical voltage, but they do not fire nerve impulses. However, their constant battery-like voltage can strengthen or weaken slowly in some interesting circumstances.
The cell membrane is the barrier between battery poles in a neuron, separating the inside from the outside of the cell. Inside the nerve cell there is an excess of negative charges, giving the nerve cell a voltage of “0.1 volt. If this imbalance of ions across the neuronal membrane ever depletes to zero, the neuron battery is dead and it will be electrically silent, unable to fire an electrical impulse. This is where astrocytes come into play, for they are vital in maintaining the proper balance of ions in the space between cells in our brain. By controlling these charged ions outside the neuron, glia recharge the battery and help control the power source for neurons.
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