Sotirimod is primarily used in the field of immunology and autoimmune disease research. It functions as a selective modulator of the sphingosine 1-phosphate receptor 1 (S1P1), which plays a crucial role in regulating immune cell migration. By targeting this receptor, Sotirimod helps in controlling the movement of lymphocytes, thereby reducing their infiltration into tissues. This mechanism is particularly beneficial in managing conditions like multiple sclerosis, where immune cells attack the nervous system. Additionally, Sotirimod is being investigated for its potential in treating other autoimmune disorders, such as lupus and rheumatoid arthritis, by modulating immune responses and preventing tissue damage. Its ability to fine-tune immune activity without broad suppression makes it a promising candidate for targeted therapeutic strategies.