RE: Bristol Myers wins a megablockuster bet with TYK2 FDA approval — and there's a big bonus for the lab11 Sep 2022 22:47
Year old news
'Psoriasis is a common, chronic inflammatory skin condition that impairs patients’ physical health, emotional well-being, work performance, and overall quality of life. Psoriasis and related conditions such as psoriatic arthritis are caused by abnormalities in the immune system. Various drugs are used or explored to treat these conditions, including Janus kinase (JAK) inhibitors; however, JAK inhibitors are associated with a range of side effects such as abnormal changes in blood cell, cholesterol, and triglyceride levels, as well as liver and kidney dysfunction. Deucravacitinib is a new oral drug in development that blocks a key molecule involved in the pathogenesis of psoriasis known as tyrosine kinase 2 (TYK2). This analysis compared the selectivity of deucravacitinib versus approved JAK 1/2/3 inhibitors (tofacitinib, upadacitinib, and baricitinib) for TYK2 and JAK 1/2/3 in whole blood assays, using therapeutic doses of each drug. The authors reported that deucravacitinib inhibits TYK2 with minimal or no inhibition of JAK 1/2/3. In contrast, tofacitinib, upadacitinib, and baricitinib inhibit JAK 1, JAK 2, and/or JAK 3 to various degrees but do not inhibit TYK2. These results demonstrate that deucravacitinib is a distinct class of drug compared with the JAK 1/2/3 inhibitors. The results of this analysis are consistent with those of two recently completed phase 3 trials in patients with moderate-to-severe plaque psoriasis (POETYK PSO-1 and PSO-2), as well as a phase 2 trial in psoriasis, in which deucravacitinib was efficacious and well tolerated, without clinical or laboratory abnormalities suggestive of JAK 1/2/3 inhibition being observed.'
https://pubmed.ncbi.nlm.nih.gov/34471993/
from Aug 20
TYK2 and Jak1 are critical for signal transduction of many key cytokines driving psoriasis. TYK2 is mainly associated with IL-23 and IL-12 signaling (Tokumasa et al., 2007) in T cells (Ishizaki et al., 2011), whereas many other cytokines signal through Jak1 in keratinocytes (Sohn et al., 2013). Hence, dual blockade of TYK2 and Jak1 has the potential to rapidly attenuate both the immune and epithelial components that create the psoriasis phenotype. Similar Jak/signal transducer and activator of transcription signaling pathways are also implicated in the pathogenesis of other autoimmune diseases including rheumatoid arthritis and inflammatory bowel diseases, but psoriasis is the most accessible disease for mapping molecular disease responses to Jak inhibitors