What causes myasthenia gravis?
-
Myasthenia gravis is caused by a defect in the transmission of nerve impulses to muscles. It occurs when normal communication between the nerve and muscle is interrupted at the neuromuscular junction -- the place where nerve cells connect with the muscles they control. Normally when impulses travel down the nerve, the nerve endings release a neurotransmitter substance called acetylcholine. Acetylcholine travels from the neuromuscular junction and binds to acetylcholine receptors which are activated and generate a muscle contraction.
In myasthenia gravis, antibodies block, alter, or destroy the receptors for acetylcholine at the neuromuscular junction, which prevents the muscle contraction from occurring. These antibodies are produced by the body's own immune system. Myasthenia gravis is an autoimmune disease because the immune system --which normally protects the body from foreign organisms -- mistakenly attacks itself.
This answer is based on source information from the National Institute of Neurological Disorders and Stroke.
Myasthenia gravis is caused by a defect in the transmission of nerve impulses to muscles. It occurs when normal communication between the nerve and muscle is interrupted at the neuromuscular junction -- the place where nerve cells connect... More -
The exact cause of the myasthenia gravis is not fully understood, but the thymus gland, located under the breast bone, plays an important role in causing the immune system's attack on the acetylcholine receptors. The condition may be controlled with medications including immune suppressants and surgical removal of the thymus gland.
The exact cause of the myasthenia gravis is not fully understood, but the thymus gland, located under the breast bone, plays an important role in causing the immune system's attack on the acetylcholine receptors. The condition may be... More -
Dr. Darshan Shah of NorthShore University HealthSystem answered:Myasthenia gravis is an autoimmune condition in which there is a disruption in the communication between the nerves and muscles. Specifically, a person's immune system forms antibodies, for reasons we don't entirely understand, against the acetycholine receptor. This receptor is vital to communication between the nerve and muscle and so when antibodies are blocking the receptor, the nerve and muscle are not able to communicate properly; this results in weakness.Myasthenia gravis is an autoimmune condition in which there is a disruption in the communication between the nerves and muscles. Specifically, a person's immune system forms antibodies, for reasons we don't entirely understand, against the... More -
Myasthenia gravis occurs when the nerves and muscles in the body are unable to communicate properly. Normally, a chemical called acetylcholine sends nerve signals to the receptor sites of the muscles. The receptor sites then signal the muscles to contract. When the muscles contract, they allow people to perform physical movements. This process is impaired in people with myasthenia gravis.In people with myasthenia gravis, the immune system, which helps fight against disease and infection, is overactive. For unknown reasons, the immune system attacks the receptor sites for acetylcholine in the muscles, and ultimately blocks, alters, or destroys the receptors. Because the patient has fewer functioning receptor sites than normal, the muscles receive fewer nerve signals, ultimately resulting in muscle weakness.
Researchers believe that part of the immune system, called the thymus gland, may play a role in this autoimmune reaction. It is believed that the thymus gland may trigger and/or produce the abnormal antibodies (called autoantibodies) that attack the receptor sites in the muscles. Some adults with myasthenia gravis have abnormally large thymus glands or tumors on the gland. However, the relationship between the thymus gland and myasthenia gravis is not completely understood.
Several factors may worsen the symptoms of myasthenia gravis, including illnesses or infections, stress, extreme heat, fatigue, and some medications (e.g., quinine, aminoglycoside antibiotics, phenothiazines, methoxyflurane, calcium channel blockers, and beta blockers). Therefore, patients should talk to their doctors before taking any drugs (prescription or over-the-counter), herbs, or supplements.
You should read product labels, and discuss all therapies with a qualified healthcare provider. Natural Standard information does not constitute medical advice, diagnosis, or treatment.
Myasthenia gravis occurs when the nerves and muscles in the body are unable to communicate properly. Normally, a chemical called acetylcholine sends nerve signals to the receptor sites of the muscles. The receptor sites then signal the muscles to... More -
Riverside Center for Neurosciences answered:Myasthenia gravis is caused by a disruption in communication between nerves and muscles. Typically, nerves and muscles communicate using messengers called neurotransmitters. After nerves release neurotransmitters, the neurotransmitters find their way to specific receptors on the cells that make up muscles. In the case of this disorder, the immune system, (possibly because of a malfunction of the thymus gland), mistakenly develops antibodies that begin to attack many of the receptors that respond to the neurotransmitter acetylcholine. Now, your muscles cannot communicate as clearly with your nervous system and, thus, cannot function as they should.
Myasthenia gravis is caused by a disruption in communication between nerves and muscles. Typically, nerves and muscles communicate using messengers called neurotransmitters. After nerves release neurotransmitters, the neurotransmitters find their... More
