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Expression data from immortal and senescence-programmed Huh7 clones

ABSTRACT: Cellular senescence is a tumor suppressor mechanism, and immortalization facilitates neoplastic transformation. Both mechanisms may be highly relevant to hepatocellular carcinoma (HCC) development and its molecular heterogeneity. Cellular senescence appears to play a major role in liver diseases. Chronic liver diseases are associated with progressive telomere shortening leading senescence that is observed highly in cirrhosis, but also in some HCC. We previously described the generation of immortal and senescence-programmed clones from HCC-derived Huh7 cell line. We used microarrays to detail the global programme of gene expression profiles of immortal and senescent-programmed clones.

ORGANISM(S): Homo sapiens

PROVIDER: GSE17546 | GEO | 2013/05/23

SECONDARY ACCESSION(S): PRJNA118543

REPOSITORIES: GEO

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Homo sapiens

Project description:Expression data from immortal and senescence-programmed Huh7 clones

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H3K27me3 in mortal and immortal breast cells

Project description:H3K27me3 changes during immortalization of breast cells. The aim of the study was to determine whether differential epigentic state of TERT gene is involved in immortalization of breast cells. comparison of Pre-Stasis, Post-Selection, and immortal cells

2013-07-03 | E-GEOD-48456 | biostudies-arrayexpress

H3K4me3 in mortal and immortal breast cells

Project description:H3K4me3 changes during immortalization of breast cells. The aim of the study was to determine whether differential epigentic state of TERT gene is involved in immortalization of breast cells. comparison of Pre-Stasis, Post-Selection, and immortal cells

2013-07-03 | E-GEOD-48457 | biostudies-arrayexpress

DNA methylation of mortal and immortal breast cells

Project description:DNA methylation changes during immortalization of breast cells. The aim of the study was to determine whether differential epigentic state of TERT gene is involved in immortalization of breast cells. comparison of Pre-Stasis, Post-Selection, and immortal cells

2013-07-03 | E-GEOD-48447 | biostudies-arrayexpress

Immortalization capacity of HPV types is inversely related to chromosomal instability in immortal descendants.

Project description:Human papillomavirus (HPV) induced immortalization of human foreskin keratinocytes (HFK) is a two-step process, including 1) the bypass of replicative senescence and acquisition of an extended lifespan, and 2) the outgrowth of immortal cells. Our previous study showed that the immortalization capacity of HPV is type dependent, as reflected by the presence or absence of a crisis period before reaching immortality. In the present study we determined how the HPV-type specific immortalization capacity relates to DNA damage induction and overall genomic instability. Early passage HFKs transduced with HPV types 16, 18, 31, 33, 35, 45, 51, 59, 66 and 70 showed an increased number of double strand DNA breaks compared to controls, without significant differences between the various HPV-types. However, immortal descendants of HPV-transduced HFKs that underwent a crisis period (HPV45-, 51-, 59-, 66- and 70-transduced HFKs) showed significantly more chromosomal aberrations compared to those without a crisis period (HPV16-, 18-, 31-, and 35-transduced HFKs) (p<0.01). In particular, regions on chromosome 5p, 8, and 9q were significantly more frequently altered in cells with crisis. Interestingly, the hTERT locus at 5p was exclusively gained in cell lines with crisis. Chromothripsis was detected in one of the HPV16-immortalized cell lines in which multiple rearrangements within chromosome 8 resulted in a gain of c-MYC. In conclusion, the present study shows that upon HPV-induced immortalization, the number of chromosomal aberrations is inversely related to the immortalization capacity of the virus type. This suggests that hrHPV types with reduced immortalization capacity in vitro, as reflected by a crisis period, require more genetic host cell aberrations to trigger immortalization. DNA copy number analysis of human keratinocytes transformed by high-risk HPV

2016-08-01 | E-GEOD-72063 | biostudies-arrayexpress

Immortalization capacity of HPV types is inversely related to chromosomal instability in immortal descendants.

2016-08-01 | GSE72063 | GEO

Transcription profiling of human normal and RhoA immortal cells

Project description:Rho family small GTPases serve as molecular switches in the regulation of diverse cellular functions including actin cytoskeleton remodeling, cell migration, gene transcription, and cell proliferation. Importantly, Rho overexpression is frequently seen in many carcinomas. However, published studies have almost invariably utilized immortal or tumorigenic cell lines to study Rho GTPase functions and there are no studies on the potential of Rho small GTPase to overcome senescence checkpoints and induce preneoplastic transformation of human mammary epithelial cells (hMECs). We found that ectopic expression of wild-type RhoA as well as a constitutively-active RhoA mutant (G14V) in primary hMEC strains led to their immortalization and preneoplastic transformation. Significantly, RhoA-T37A mutant, known to be incapable of interacting with many well known Rho-effectors ,was also capable of immortalizing hMECs.Our results demonstrate that RhoA can induce the preneoplastic transformation of hMECs by altering multiple pathways linked cellular transformation and breast cancer. Through microarray analysis, we want to identify genes and pathways linked to RhoA induced hMECs immortalization. Experiment Overall Design: 4 samples, in triplicate analyses per sample.

2008-10-26 | E-GEOD-12917 | biostudies-arrayexpress

Gene expression profile of normal and RhoA immortal cells

2008-09-26 | GSE12917 | GEO

Mammalian cells acquire epigenetic hallmarks of human cancer during immortalization

Project description:Progression to malignancy requires cells to overcome senescence and switch to an immortal phenotype. Thus, exploring the genetic and epigenetic changes that occur during senescence/immortalization may help elucidate crucial events that lead to cell transformation. In the present study, we have globally profiled DNA methylation in relation to gene expression in primary, senescent and immortalized mouse embryonic fibroblasts.

2012-11-29 | GSE39034 | GEO

Mammalian cells acquire epigenetic hallmarks of human cancer during immortalization

2012-11-29 | E-GEOD-39034 | biostudies-arrayexpress

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