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[Knock-down of ERα36 impacts the expression of differentiation protein in PC12 cells].

ERα36 is a novel subtype of estrogen receptor alpha (ERα) known to play an important role in breast cancer development and widely expressed in normal tissues and cells including nerve cells. However, the expression and function of ERα36 in nerve cells have not been well elucidated. To examine whether ERα36 is involved in differentiation of nerve cells, the differentiated and undifferentiated PC12 (PC12D and PC12unD) cells were used. Transfection of ERα36-shRNA plasmid into PC12 cells was performed to establish the ERα36 gene knock-down cells model. Immunocytofluorescence and Western blot were used to analyze the expression of Nestin, β-tubulinIII and Neu-N in the PC12 cells. The results showed that ERα36 was expressed in both cell types. Compared with PC12D cells, PC12unD cells showed higher expression of Nestin and lower expression of β-tubulinIII. ERα36-shRNA-mediated knock-down of ERα36 expression enhanced the expression of β-tubulinIII and Neu-N, but attenuated Nestin expressions in PC12unD cells; ERα36 knock-down in PC12D cells mediated Nestin, β-tubulinIII and Neu-N in a contrary manner. These results indicate that ERα36 knock-down appear to be associated with inhibiting differentiation in differentiated cells and promoting differentiation in undifferentiated cells, suggesting that ERα36 is a dual regulator in nerve differentiation.