中波紫外線誘導皮膚成纖維細胞凋亡的機制研究
[Abstract]:Background:
Ultraviolet radiation is an important environmental factor closely related to human skin. According to different wavelengths, ultraviolet radiation can be divided into long-wave ultraviolet radiation (UVA, 320-400 nm), medium-wave ultraviolet radiation (UVB, 280-320 nm) and short-wave ultraviolet radiation (UVC, 200-280 nm). The ultraviolet radiation that can reach the earth's surface includes only UVA and UVB. Compared with UVA, the same dose of UVB on the skin. The damage intensity is about 1000 times that of UVA.
Fibroblasts are the main components of dermis. After ultraviolet irradiation, the growth, differentiation and function of skin fibroblasts will be significantly changed. In our previous work, we found that low doses of UVB irradiation can cause specific changes in skin fibroblasts by two-dimensional electrophoresis, mass spectrometry and immunoblotting. Vimentin (vimentin) content increased. Vimentin contains the digestion sites of cystatin-8 and cystatin-3. In the process of cell apoptosis, the degradation products of vimentin can promote cell apoptosis when it is destroyed by these proteases.
In the process of UVB-induced apoptosis of skin fibroblasts, whether vimentin-8 and vimentin-3 can be activated by UVB, how the receptor-interacting protein-1 associated with cystatin-8 changes, and whether the cytoskeleton vimentin specific to fibroblasts is destroyed by cystatin are compared horizontally with the other two. The ubiquitous changes of cytoskeleton proteins, tubulin and actin, in the process of apoptosis, were investigated to explore the mechanism of UVB-induced apoptosis of skin fibroblasts.
Method:
(1) primary human dermal fibroblasts were cultured in vitro and passaged by 3-6 generation cells.
(2) In order to select the appropriate dose and observation time of UVB irradiation, the effects of different doses of UVB on the viability of fibroblasts were compared by MTT colorimetry, and then the changes of cell viability at 12, 24, 36 and 48 hours after 150 mJ/cm 2 UVB irradiation were compared.
(3) After 150 mJ/cm 2 UVB irradiation, the morphological changes of the nuclei were observed and the number of apoptotic cells was calculated.
(4) The activity of cystatin-8 and cystatin-3 in fibroblasts irradiated with 150 mJ/cm2 UVB was detected by fluorescence colorimetry.
(5) The changes of vimentin content in fibroblasts induced by UVB irradiation were detected by cell fluorescence and Western Blot assay.
(6) The contents of alpha-tubulin, beta-tubulin and beta-actin in fibroblasts irradiated with 150 mJ/cm2 UVB were detected by Western Blot technique.
(7) The changes of receptor-interacting protein-1 mRNA and protein content in fibroblasts irradiated with 150 mJ/cm2 UVB were detected by RT-PCR and Western Blot.
Result:
(1) 24 hours after 50-300 mJ/cm2 UVB irradiation, the viability of skin fibroblasts decreased in varying degrees; after 150 mJ/cm2 UVB irradiation, the viability of skin fibroblasts gradually decreased at 12, 24, 36 and 48 hours.
(2) 150mJ/cm2UVB could induce apoptosis of skin fibroblasts. When the activity of cystatin was inhibited, the number of apoptotic cells induced by UVB decreased.
(3) Cystatin-8 and cystatin-3 of fibroblasts were activated after 150 mJ/cm2 UVB irradiation. The activity of cystatin-8 and cystatin-3 increased significantly at 12 hours after irradiation, and decreased gradually with the prolongation of irradiation time. At 48 hours after irradiation, the activity of cystatin-8 and cystatin-3 was the lowest.
(4) When the activation of cystatin-8 was inhibited, the activation of cystatin-3 was delayed; otherwise, when the activity of cystatin-3 was inhibited, the activation of cystatin-8 was also delayed.
(5) when the activity of caspase -8 and -3 was inhibited respectively, the number of apoptotic cells decreased significantly.
(6) During UVB-induced apoptosis of skin fibroblasts, the content of vimentin increased, the content of beta-tubulin decreased, while the contents of alpha-tubulin and beta-actin remained unchanged.
(7) In apoptotic fibroblasts, the mRNA content of receptor-interacting protein-1 decreased and its protein content increased.
Conclusion:
(1) Activated cystatin-8 and cystatin-3 interact with each other in the process of UVB-induced apoptosis of skin fibroblasts, and play a role in promoting cell apoptosis.
(2) Activated cystatin-8 and cystatin-3 could not affect cell apoptosis by hydrolyzing vimentin.
(3) Reduced beta-tubulin and increased receptor-interacting protein-1 may play a role in apoptosis.
(4) Alpha-tubulin and beta-actin are not affected by UVB. They can be used as internal reference proteins for immunoblotting in the study of UVB-induced apoptosis of skin fibroblasts.
【學位授予單位】:中國協和醫(yī)科大學
【學位級別】:博士
【學位授予年份】:2010
【分類號】:R751
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