The expression pattern of Nischarin after lipopolysaccharides (LPS)-induced neuroinflammation in rats brain cortex.

Objective: To investigate whether Nischarin participated in neuronal apoptosis induced by neuroinflammation and via the phosphatidylinositol 3-kinase (PI3K) and PKB-dependent pathway.

Material: Use of male Sprague-Dawley rats, rat pheochromocytoma (PC12), and murine microglial cells (BV-2). Treatment lipopolysaccharides (LPS) were injected into the brain lateral ventricle of the rat. The BV-2 cells were treated by LPS. The PC12 cells were pretreated by or not pretreated by conditioned media and siRNA.

Methods: Western blotting was used for analyzing the expression level of Nischarin, pAKT, BAD and Bcl-2. Immunohistochemistry and immunofluorescence were used to perform the morphology and localization of Nischarin. The siRNA could down-regulate the protein level of endogenous Nischarin.

Results: The expression level of Nischarin was elevated after LPS injection; meanwhile, Nischarin was located in the neuron. Nischarin was involved in regulating the PI3K/PKB patway.

Conclusion: Nischarin might be involved in mediating the process of PI3K/PKB pathway-dependent neuronal apoptosis. After the silencing of Nischarin in cultured PC12 (pheochromocytoma) by siRNA, these results showed that it would induce a reduction of pAKT and Bcl-2 proteins expression; meanwhile, it induces an increase of BAD and active caspase-3.