CDKs

Toyocamycin (Vengicide) is an adenosine analog produced by Actinomycetes, functioning as an XBP1 inhibitor and inhibiting IRE1α-induced ATP-dependent XBP1 mRNA cleavage (IC50: 80 nM), and induces apoptosis.

Ailanthone (AIL) is a natural compound derived from the tree Ailanthus altissima and has anti-hepatocellular carcinoma (HCC) properties. It can induce G0 G1 phase cell cycle arrest by downregulating the expression of cyclins and CDKs, while upregulating the expression of p21 and p27. Additionally, Ailanthone is a potent androgen receptor (AR) inhibitor, capable of inhibiting both the full-length androgen receptor (IC50: 69 nM) and constitutively active splice variants (IC50: 309 nM).

Flavopiridol hydrochloride (MDL 107826A) is a synthetic N-methylpiperidinyl chlorophenyl flavone compound. As an inhibitor of cyclin-dependent kinase, alvocidib induces cell cycle arrest by preventing phosphorylation of cyclin-dependent kinases (CDKs) and by down-regulating cyclin D1 and D3 expression, resulting in G1 cell cycle arrest and apoptosis. This agent is also a competitive inhibitor of adenosine triphosphate activity.