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. 2021 Feb 15;18(1):120–138. doi: 10.20892/j.issn.2095-3941.2020.0105

Figure 4.

Figure 4

The loss of RECQL4 induces cell cycle arrest and cellular senescence. (A) Depletion of RECQL4 by siRNA. RECQL4 protein levels were measured by Western blot. KYSE30 and TE-1 cells were transfected with siRNA duplexes (200 nM) specific to RECQL4 or negative oligo in serum-free medium for 4 h, then replaced with complete medium for 24 h. Whole cell extracts were collected for Western blot analysis using RECQL4 antibodies. (B) Cell cycle distributions in RECQL4 knockdown cell lines (KYSE30 and TE-1 cells) and controls were determined by flow cytometry. (C) Cellular senescence was examined by SA-β-gal staining. Microscopic magnification (×200), Scale bar: 50 μm. (D) The protein levels of c-myc, p21, cyclin D, CDK6, cyclin E, Bax, and Bcl-2 were determined by Western blot in stable Tet-on inducible RECQL4 knockdown cell lines (KYSE30 and TE-1 cells) (+Dox) and controls (–Dox). Experiments were independently repeated 3 times. All data indicate the mean ± SD. *P < 0.05; **P < 0.01; ***P < 0.001.