扇贝多肽经由P16和RASSF1A基因甲基化抑制UVB诱导的HaCaT细胞恶性转化
[Abstract]:Objective to establish a pathological model of malignant transformation of HaCaT cells induced by simulated solar ultraviolet B radiation, and to study the molecular mechanism of the inhibition of UVB induced malignant transformation of HaCaT cells by chlamyfish polypeptide (PCF) from the point of view of Gadd45a,DNMTs,P16 and RASSF1A gene methylation. It provides a theoretical basis for the prevention and treatment of skin cancer induced by UVB radiation. Methods CCK8 method was used to screen and determine the single dose of malignant transformation of HaCaT cells induced by UVB radiation. The terminal point of malignant transformation of HaCaT cells induced by UVB radiation was preliminarily established by Gimsa staining. Detection of the secretion of MMP-9 protease by gelatinase assay proved that the model of malignant transformation of HaCaT cells induced by UVB radiation was successful. The experimental design was divided into 4 groups: normal control group, UVB model group, UVB 2.84 mmol / L PCF, UVB 2.84mmol/L vitamin C positive control group. The inhibitory effect of PCF on the malignant transformation of HaCaT cells induced by UVB was determined by flow cytometry, and the expression of DNMTs (DNMT1,DNMT3a, DNMT3b) mRNA (20 times UVB radiation) was detected by RT-PCR. The expression of GADD45a, DNMT3b, P16 and RASSFIA protein was detected by Western blot. High resolution dissolution curve (MS-HRM) was used to detect the methylation of P16 RASSF1A gene in the malignant transformation of HaCaT cells induced by UVB (4 times, 12 times, 20 times) by PCF. Results the malignant transformation model of HaCaT cells induced by UVB radiation was successfully established when the irradiation intensity of UVB (wavelength peak 297nm) was about 1luw / cm ~ (2), the single dose was 10 mg / cm ~ (2), the number of times was 20 times, and the total radiation dose was 200mJ/cm2. (2) 84 mmol / L LPCF inhibited the malignant transformation of HaCaT cells induced by UVB radiation more significantly than VC (P0.05). The expression of DNMT1 and DNMT3a in HaCaT cells irradiated with DNMT1 and DNMT3amRNA was not significantly different from that in HaCaT cells irradiated with UVB (I0.05), and the mRNA and protein expressions of DNMT3b were observed. After 20 times of UVB radiation, the expression of Gadd45a protein reached the peak (P0.05), and the expression of Gadd45a protein reached the peak after 4 times of UVB radiation. The expression of P16 and RASSF1A decreased gradually after 20 times of UVB irradiation (P0.05), and the expression of P16 and RASSF1A decreased gradually after 20 times of UVB irradiation (P0.05). Both PCF and VC could inhibit the methylation of P16 and RASSFIA genes (P0.05), promote the expression of P16, RASSFIA and GADD45a (P0.05), inhibit the expression of DNMT3b (P0.05), and PCF was more effective than VC (P0.05). Conclusion the model of malignant transformation of HaCaT cells induced by simulated ultraviolet B radiation is established for the first time in the world. It is revealed that the hypermethylation of P16 and RASSFIA genes is closely related to the malignant transformation of HaCaT cells. It was demonstrated that the polypeptide of chlamys farreri inhibited the hypermethylation of P16 and RASSF1A genes by regulating the expression of DNMT3b and GADD45a genes and prevented the malignant transformation of HaCaT cells induced by UVB radiation.
【学位授予单位】:青岛大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:R739.5
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