Staphylococcal nuclease domain-containing protein 1 (EC 3.1.31.1) (100 kDa coactivator) (EBNA2 coactivator p100) (Tudor domain-containing protein 11) (p100 co-activator) [TDRD11]
To investigate the effect of down-regulation of SND1 expression on senescence of human diploid fibroblasts. Western blot and immunohistochemistry were used to detect the expression of SND1 in young or senescent 2BS cells and aged tissues. Immunofluorescence was conducted to detect the localization of SND1 in young 2BS cells. CCK8 and EDU were performed to detect the proliferation of 2BS. Colony formation analysis was used to evaluate the capacity of colony formation of 2BS. Expression chip and RT-qPCR analysis were performed to detect the change of SASP expression level. β-galactosidase staining was employed to indicate the senescent 2BS cells. The expression of SND1 in the senescent 2BS cells was significantly down-regulated compared with in the younger 2BS cells, and in human colon adenomas, its expression was also significantly down-regulated compared with in non-lesion colon tissues. In young 2BS, knockdown of [i]SND[/i]1 inhibited the proliferation and colony formation of 2BS, and led to stronger senescence-associated beta-galactosidase staining (SA-β-gal). Expression chip and RT-qPCR analysis indicated that knockdown of [i]SND[/i]1 up-regulated the expression of senescence-associated secretory phenotype components (SASP). Our data indicated that down-regulation of SND1 regulated human diploid cell senescence by up-regulating the expression of SASP components.
MeSH Terms
Keywords