protein phosphatase 2a

Ethoxysanguinarine (6-Ethoxydihydrosanguinarine) 是存在于龙葵中的一种苯并菲啶生物碱天然产物，通过抑制蛋白磷酸酶 2A，可抑制结直肠癌细胞活力，诱导细胞凋亡。

Calyculin A ((-)-Calyculin A) 是日本海洋海绵 CDiscodermia calyxC 中的毒性物质，是一种具有选择性和高效性的蛋白磷酸酶 1 (PP1) 和蛋白磷酸酶 2A (PP2A) 抑制剂， 诱导冷冻保存牛精子的过度激活，抑制人淋巴细胞中辐射诱导的 gammaH2AX DNA 修复病灶的消失。

N-Stearoylsphingosine (Cer(d18:1/18:0)) 是一种广泛存在真核生物体内的酰胺类化合物，通过干扰PP2A与PP2A抑制剂2的结合来增强蛋白质磷酸酶2A(PP2A)活性，导致Akt去磷酸化。N-Stearoylsphingosine 可用于研究前列腺癌。

Cytostatin is a natural antitumor inhibitor of cell adhesion to extracellular matrix, blocking adhesion of B16 melanoma cells to laminin and collagen type IV in vitro (IC50s = 1.3 and 1.4 μg/ml, respectively) and B16 cells metastatic activity in mice. It induces apoptosis of FS3 mouse fibrosarcoma cells (IC50 = 3.1 μg/ml). Cytostatin potently and selectively inhibits protein phosphatase 2A (PP2A; IC50 = 29 nM against the catalytic subunit), while having no effect against PP1, PP2B, or PP5.

Motuporin is an inhibitor of type-1 and type-2A protein phosphatase catalytic subunits (PP-1c and PP-2Ac).