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. 2020 May 19;48(11):6001–6018. doi: 10.1093/nar/gkaa425

Figure 5.

Figure 5.

ZKSCAN3 overexpression alleviates hMSC aging. (A) Immunostaining of Ki67 in RS (P10) (upper), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (lower) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3, respectively. Scale bar, 25 μm. White arrows represent Ki67-positive cells. Data are presented as the mean ± SEMs, n = 3. *P < 0.05, **P < 0.01 (two tailed t-test). (B) Clonal expansion ability analysis of RS (P10) (upper), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (lower) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3. Data are presented as the mean ± SEMs, n = 3. *P < 0.05, **P < 0.01, ***P < 0.001 (two tailed t-test). (C) SA-β-gal staining of RS (P10) (upper), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (lower) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3. Data are presented as the mean ± SEMs, n = 3. *P < 0.05, **P < 0.01 (two tailed t-test). (D) Relative nuclear size analysis in RS (P10) (upper), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (lower) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3. Data are presented as the mean ± SEMs, n = 200. *P < 0.05, **P < 0.01 (two tailed t-test). (E) Heatmaps showing the mRNA expression levels of P16 and IL6 in RS (P10) (upper), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (lower) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3 by RT-qPCR. (F) Immunostaining of HP1α in RS (P10) (left), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (right) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3. Scale bar, 25 μm. Data are presented as the mean ± SEMs, n = 300. ***P < 0.001 (two tailed t-test). (G) Enrichment of H3K9me3 within the regions of repetitive sequences in RS (P10) (left), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (right) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3 as measured by ChIP-qPCR. Data are presented as the mean ± SEMs. n = 4. **P < 0.01, ***P < 0.001 (two tailed t-test). (H) Heatmaps showing the mRNA expression levels of repetitive sequences in RS (P10) (left), LMNAG608G/+ (P6) (middle) and an aged individual-derived primary (P8) (right) hMSCs transduced with lentiviruses expressing Luc or ZKSCAN3 by RT-qPCR.