Fig. 2 hTERT induces expression of heat shock protein genes through HSF1 and interacts with Hsp70-1. hTERT induces expression of heat shock protein genes.

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Fig. 2 hTERT induces expression of heat shock protein genes through HSF1 and interacts with Hsp70-1. hTERT induces expression of heat shock protein genes through HSF1 and interacts with Hsp70-1. (A) hTERT Western blot using whole-cell extracts from GM639 cells showing overexpression of WT or catalytically inactive (D712A) hTERT for 24 hours in triplicate samples used for RNA sequencing. Actin is used as a loading control. (B) Venn diagram showing differential gene expression resulting from transient overexpression of WT and catalytically inactive (D712A) hTERT compared to the vector control (Vec). Only five genes were up-regulated >2-fold, including TERT. For full details of gene names and fold changes, refer to fig. S4A. (C) Validation using qRT-PCR of the up-regulation of Hsp70-1 genes HSPA1A and HSPA1B upon transient hTERT overexpression for 24 hours in GM639 cells. mRNA levels are normalized to vector control (mean ± SE; n = 3 independent experiments). *P < 0.05, ***P < 0.001, ****P < 0.0001. (D) Validation using qRT-PCR of the up-regulation of Hsp70-1 genes HSPA1A and HSPA1B upon transient hTERT overexpression for 24 hours in HT1080 cells. mRNA levels are normalized to vector control (mean ± SE; n = 3 independent experiments). *P < 0.05, **P < 0.01, ***P < 0.001. (E) hTERT (127 kDa) and Hsp70-1 (70 kDa) Western blots using whole-cell extracts from GM639 cells transiently overexpressing WT and D712A hTERT for 24 hours. Actin is used as a loading control. (F) Relative mRNA expression of HSPA1A and HSPA1B using qRT-PCR, in GM639 cells overexpressing hTERT with simultaneous depletion of HSF1, 24 hours after transfection (mean ± SE; n = 3 independent experiments). Normalized to Vec + control siRNA (Vec siSc). *P < 0.05, ****P < 0.0001. (G) Immunoprecipitation using antibodies against hTERT (sheep), Hsp70-1 (mouse), and immunoglobulin G (IgG) control [mouse (top) or sheep (bottom)] from lysates of 293T cells overexpressing hTERT. Input (2 × 104 cell equivalents) and eluates were visualized on Western blots probed for hTERT (goat antibody) and Hsp70 (rabbit antibody). Volumes of eluate loaded correspond to the following cell equivalents: 2 × 105 (hTERT eluate on hTERT blot), 4 × 105 (Hsp70 eluate on Hsp70 blot), 1 × 106 (IgG control), and 4 × 106 (hTERT eluate on Hsp70 blot and Hsp70 eluate on hTERT blot). (H) Representative fluorescent micrographs of GM639 cells transiently overexpressing WT hTERT for 24 hours, with immunofluorescence for Hsp70-1 (red) and GFP-tagged hTERT (green), and 4′,6-diamidino-2-phenylindole (DAPI) staining showing the nucleus. Scale bars, 10 μm. The two images shown are displaying primarily cytoplasmic localization of hTERT. (I) PLA for hTERT and Hsp70-1 (red), in HT1080 cells with and without hTERT overexpression, combined with hTERT immunofluorescence (green) and DAPI staining showing the nucleus (blue). A negative PLA control was performed by leaving out the Hsp70-1 primary antibody (−ve control). (J) 3D reconstruction of image in Fig. 2I, using the Imaris software (Bitplane), to further validate the nuclear localization of hTERT-Hsp70-1 PLA foci (red), with DAPI staining showing the nucleus (blue). See also the Supplementary Materials, fig. S4. Omesha N. Perera et al. Sci Adv 2019;5:eaav4409 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).