PP2A-B56-δ Inhibitors

The class of compounds termed PP2A-B56-δ Inhibitors includes various chemicals that indirectly target or influence the activity of the PP2A-B56-δ regulatory subunit of the PP2A complex. These inhibitors function by modulating the activity of the PP2A complex, a major phosphatase in cellular signaling, rather than directly binding to or inhibiting the PP2A-B56-δ subunit. The primary mechanism through which these inhibitors function involves the modulation of PP2A activity. Compounds such as Okadaic Acid, Cantharidin, and Endothall are known inhibitors of PP2A, and their use can indirectly affect the functions associated with the PP2A-B56-δ subunit. By inhibiting the phosphatase activity of PP2A, these compounds can alter the phosphorylation status of various proteins, impacting cellular processes like cell cycle regulation, apoptosis, and signal transduction.

Other compounds, like LB-100 and Fostriecin, are more selective PP2A inhibitors and might specifically impact the activities related to the PP2A-B56-δ subunit. Calyculin A and Tautomycin, while also targeting PP2A, have broader phosphatase inhibition profiles and can affect multiple signaling pathways.Norcantharidin and derivatives of cantharidin offer a modified inhibitory profile, potentially impacting PP2A-B56-δ functions. I-2 (Inhibitor-2), primarily known for inhibiting PP1, may also have off-target effects on PP2A, influencing the PP2A-B56-δ subunit. Phenothiazines and Ceramide, through their influence on PP2A activity, can indirectly affect the regulatory functions of PP2A-B56-δ. Bithionol is another compound reported to inhibit PP2A, adding to the potential indirect modulators of PP2A-B56-δ.