What is the specific function of Besudil/Elac and how to exert its effect?

Belumosudil mesylate tablets (Belumosudil), as a ROCK2 inhibitor, represents a class of innovative drugs that act through immune remodeling mechanisms. Its core mechanism of action is to regulate multiple signaling pathways related to inflammatory response and immune tolerance by inhibiting the activity of Rho-related coiled-coil kinase 2 (ROCK2). The pathological basis of chronic graft-versus-host disease is abnormal activation of T cells and excessive release of inflammatory factors, leading to fibrosis and functional damage of the recipient organ. Besudil can improve the balance of the immune system and reduce tissue damage by reducing the activity of pro-inflammatory Th17 cells and increasing the proportion of Treg cells.

From a molecular level,ROCK2 plays a key role in cytoskeletal reorganization, cell migration and inflammation regulation. By inhibiting the ROCK2 signaling pathway, Besudil can significantly reduce the expression of fibrotic factors, including TGF-β-related pathways, thereby delaying tissue sclerosis. Compared with traditional immunosuppressive drugs, the advantage of Besudil is that its effect is more targeted, which can not only suppress harmful inflammation, but also retain necessary immune functions and reduce the risk of secondary infections. In addition, the drug is well absorbed after oral administration, has a moderate half-life, can be taken once a day, and has high patient compliance.

In clinical practice, besudil is used to treat patients 12 years of age and older with chronic GVHD who are refractory to glucocorticoids or immunosuppressants. Studies have shown that the drug can improve symptoms in patients with multi-system involvement, including skin, liver and mucosal lesions, and significantly improve the quality of life. It is worth noting that liver function and potential drug interactions need to be monitored regularly during use.

Overall, the emergence of besudil marks the entry of chronic GVHD treatment into a new era of "precision immune regulation", bringing new treatment hope to refractory patients.

Reference: https://www.drugs.com/pro/rezurock.html