Like the M 1 and M 3 muscarinic receptor, M 5 receptors are coupled with G proteins of class Gq that upregulate phospholipase C and, therefore, inositol trisphosphate and intracellular calcium as a signaling pathway.
Radioactive iodine is a very effective type of treatment for cancer of the thyroid gland. Thyroid cells absorb iodine. The radioactive iodine from the drink or capsule is absorbed into your body and picked up by the thyroid cancer cells wherever they are. So it can kill the cancer cells even if they have spread.
Why am I getting radioactive iodine (RAI) treatment? Like other forms of radiation therapy, RAI treatment involves the use of radiation to destroy cancerous tissue. In RAI treatment, the purpose is to destroy any remaining thyroid tissue following surgery or to treat residual or recurrent disease.