Identifying Qingkailing ingredients-dependent mesenchymal-epithelial transition factor-axiation "π" structuring...

To explore the functional role of the drug-dependent mesenchymal-epithelial transition (Met)-axiation "π" structural module of neurogenesis after processing by three components of Qingkailing injection in neurogenesis and angiogenesis in cerebral ischemia.

We used a Glutathione S-transferase (GST)-pull down assay, isothermal titration calorimetry assay, and other related methods to identify the relationships among Met, inositol polyphosphate phosphatase like 1 (Inppl1), and death associated protein kinase 3 (Dapk3) in this allosteric module. The biological effects of the modules of neurons generation composed of Met, Inppl1, and Dapk3 were measured through Western blot, apoptosis analysis, and double immunofluorescence labeling.

The GST-pull down assay revealed that proline-serine-threonine rich domain of Met binds to the Src homology domain of Inppl1 to form a protein-protein complex; Dapk3 with a C-terminal domain interacts weakly with the protein kinase C domain of Met in the intracellular region. Thus, we obtained a "π" structuring module considered a neural regeneration module. The biological effects of angiogenesis and neurogenesis modules composed of Met, Inppl1, and Dapk3 were also verified.

The study suggested that understanding the functional modules that contribute to pharmaceutics might provide novel signatures that can be used as endpoints to define disease processes under stroke or cerebral ischemia conditions.