嗅黏膜神經(jīng)干細(xì)胞及嗅鞘細(xì)胞生物學(xué)特性的體外研究
[Abstract]:Objective : To establish a method for the isolation and culture of olfactory mucosa neural stem cells in vitro , optimize the culture conditions of olfactory mucosa neural stem cells , induce the differentiation of neural stem cells into dopaminergic neurons , and provide preliminary basic research data for the transplantation of olfactory mucosa neural stem cells or dopaminergic neurons in the treatment of Parkinson ' s disease .
Methods : 1 . The cell suspension was made from nasal mucosa of rat nasal septum , and cultured in DMEM / F12 medium containing 10 % fetal bovine serum for 3 days . The growth process of primary cultured cells was observed dynamically . The expression of specific molecular markers of neural stem cells in cells was detected by immunofluorescence staining .
2 . Using 2 % agarose suspension to culture the olfactory mucosa neurosphere , the biological characteristics of the cultured neurospheres were studied with the aid of immunofluorescence staining and Western blot .
3 . The expression of tyrosine hydroxylase in differentiated cells was identified by the differentiation of nerve growth factor , all - trans retinoic acid ( ATRA ) and sound Hedgehog ' s factors in olfactory mucosa , and it was confirmed that it was dopaminergic neuron .
4 . The olfactory mucosa was obtained from the nasal septum of the rat . The cell suspension was prepared in vitro . The olfactory ensheathing cells in the mixed cells were purified three times by differential adherent method , and the molecular markers of olfactory ensheathing cells were identified .
5 . The expression of neurotrophin , neuropeptide Y and vascular endothelial growth factor in olfactory ensheathing cells of olfactory mucosa in the first and 10th passages were compared by immunofluorescence staining and Western blot .
The results were as follows : 1 . After inoculation of olfactory mucosa mixed cells in culture flask , most of the cells were flattened polygonal cells . After 3 days , the cells were replaced by neural stem cell culture medium . The cells were cultured for 3 days to replace them into neural stem cell culture medium .
2 % agarose suspension cultured neural stem cells proliferate in the form of neurospheres , the morphology of the neurospheres after passage is uniform and the limit is obvious . Both immunofluorescence staining and Western blot prove that the 4th generation nerve cells in suspension culture are able to express Nestin and CD133 after 6 hours .
3 . After 24 hours of using a cell containing a cytokine - containing culture solution to act on the wall , a portion of the cells sent an elongated protrusion around each other , and the protrusions were intermeshed with each other . Immunofluorescence staining showed that both the cell body and the elongated protrusion of these multiple - protruding cells contained both nerve fibers and tyrosine hydroxylase , and the Western blot demonstrated this .
4 . In vitro amplification of olfactory ensheathing cells purified by triple differential adherent cells can obtain a large number of spindle - shaped bipolar cells , the cell arrangement rules and the morphology are consistent , and are in the form of a fish group . Immunofluorescence staining shows that the olfactory mucosa olfactory ensheathing cells of the 1st and 10th passages are positive for GFAP , S - 100 and p75NTR , and there is no difference between the two generations .
5 . Both the olfactory ensheathing cells and the 10th generation olfactory ensheathing cells express various neurotrophic factors , neuropeptides Y and vascular endothelial growth factors , and the expression level of each factor in the 1st generation is higher than that of the 10th generation .
Conclusion : 1 . In vitro isolation and screening experiment of olfactory mucosa neural stem cells in rats , we obtained semi - adherent neurospheres expressing the molecular markers of positive expression neural stem cells from the olfactory mucosa . These neurospheres can be amplified by special agarose suspension culture in the passaging process .
2 . Neural stem cells derived from olfactory mucosa can be differentiated into TH - positive neurons , and the olfactory mucosa - derived neural stem cells can induce differentiation into dopaminergic neurons in vitro .
3 . In vitro isolation and culture of olfactory mucosa from culture medium to obtain complex cell population , olfactory ensheathing cells can be purified by three times differential wall screening method , and the olfactory mucosa olfactory ensheathing cells can express various neurotrophin , and neuropeptides Y and vascular endothelial growth factors can be synthesized .
4 . The olfactory mucosa neural stem cells and olfactory ensheathing cells were obtained successfully in vitro and the neural stem cells were induced into dopaminergic neurons .
【學(xué)位授予單位】:江蘇大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2010
【分類(lèi)號(hào)】:R329.28
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