m-calpain

PD151746是一种钙蛋白酶抑制剂，对u-钙蛋白酶的选择性比对m-钙蛋白酶高20倍（Ki = 0.26 ± 0.03 μM对比Ki = 5.33 ± 0.77 μM）。其IC50值分别为0.26 ± 0.03 μM（μ-钙蛋白酶的Ki）和5.33 ± 0.77 μM（m-钙蛋白酶的Ki）[1]。体外研究表明，PD151746针对钙蛋白酶并减少oxLDL引起的细胞毒性[2]。

PD150606 是一种具有选择性的非肽 calpain 抑制剂，具有神经保护活性，抑制 μ-calpains 和 m-calpains ，抑制红藻氨酸诱导的 Ca2+ 内流，干扰兴奋性毒性依赖性运动神经元死亡。

Calpastatin (184-210), an acetylated synthetic peptide derived from human calpastatin, effectively inhibits the calcium-dependent cysteine proteases, calpain I (µ-calpain) and calpain II (m-calpain), which require micromolar and millimolar calcium concentrations, respectively. Unlike its action on calpains, this 27 amino acid peptide does not inhibit papain (a cysteine protease) or trypsin (a serine protease). Encoded by exon 1B of Ac-calpastatin (184-210), it aligns with a section of inhibitory domain 1, showcasing its specificity and inhibitory function towards calpain enzymes.

Penicillide is a fungal metabolite originally isolated from Penicillium that has diverse biological activities. It is an inhibitor of calpain 2/m-calpain (IC50 = 7.1 μM) and acyl-coenzyme A:cholesterol acyltransferase (ACAT; IC50 = 22.9 μM). It is also an antagonist of oxytocin receptors (IC50 = 67 μM). Penicillide inhibits RNA synthesis in P388 murine leukemia cells.