Fig. 2.
(A-C) Cell morphology at PDL 31, 121 and 224 of hMSC clone (SCP-1) ectopically expressing telomerase. (D, E) Senescence-associated β-galactosidase assay. Untransduced hMSCs show pronounced β-galactosidase activity at PDL 24. In contrast, hTERT-transduced hMSCs had no β-galactosidase activity even at higher passages. (F) Growth curve of untransduced hMSC (hMSCs), heterogeneous (hTERT-hMSCs) and single-cell-picked hMSC clones (SCP-1, -9, -11–12). (G) BrdU assay of heterogeneous hTERT-hMSCs and SCP-1 showed a significantly higher proliferation of SCP-1 (P= 0.00014 hTERT young [PDL 31]versus SCP-1 young passage [PDL 31]).