Activity and Regulation of Telomerase in Malignant Cells

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Lindkvist, Anna,1976-Uppsala universitet,Institutionen för genetik och patologi (författare)

Activity and Regulation of Telomerase in Malignant Cells

BokEngelska2006

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Uppsala :Acta Universitatis Upsaliensis,2006
61 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:uu-6623
ISBN:9155464866
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6623URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:dok swepub-publicationtype

Serie

Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine,1651-6206 ;119

Anmärkningar

An important step in tumorgenesis is the acquisition of cellular immortality. Tumor cells accomplish this by activating the enzyme telomerase, and thereby avoiding replicative senescence. The aim of this thesis was to study the activity and regulation of telomerase in a panel of malignant cell types.We found that TGF-β1 (transforming growth factor-β1) mediated differential effects on telomerase activity in five ATC (anaplastic thyroid carcinoma) cell lines. Cells that harbored a p53 mutation responded by up-regulation of telomerase activity after TGF-β1 treatment, whereas cell lines displaying wt p53 responded by down-regulation of telomerase activity. Thus, these results indicate a possible connection between p53 genotype and telomerase response to TGF-β1 treatment. Furthermore, the decreased telomerase activity appeared to be due to transcriptional repression of the hTERT promoter and the increased activity possibly involved hTERT activation via phosphorylation. We have previously shown that IFNs (interferons) sensitize MM (multiple myeloma) cells to Fas-mediated apoptosis. In the present investigation both IFN-α and IFN-γ down regulated telomerase activity in the MM cell line U-266-1970. The mechanism underlying the reduction of telomerase activity by IFN was shown to be transcriptional repression of the hTERT gene. We suggest that one potential mechanism whereby IFN sensitize MM cells to Fas-mediated apoptosis is by repressing hTERT activity at the transcriptional level. In the next study we demonstrated that basal telomerase activity is not a key determinant of sensitivity to cytotoxic drugs in ESCC (esophageal squamous cell carcinoma) cell lines. Furthermore, we observed no correlation between c-Myc amplification, p53 mutations and high telomerase activity levels in these cell lines. Finally, neuroblastoma cell lines were shown to up-regulate telomerase activity in response to hypoxic exposure and the main regulatory mechanism was not mediated by increased hTERT mRNA expression. This finding might constitute an adaptive stress response of tumor cells exposed to hypoxia.

Ämnesord och genrebeteckningar

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Dermatologi och venereologi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Dermatology and Venereal Diseases hsv//eng
Medicine
apoptosis
ATC
c-Myc
drug sensitivity
ESCC
hTERT
hypoxia
IFN
MM
neuroblastoma
p53
telomerase
TGF-β
Medicin
Dermatology and venerology,clinical genetics, internal medicine
Dermatologi och venerologi, klinisk genetik, invärtesmedicin

Biuppslag (personer, institutioner, konferenser, titlar ...)

Paulsson-Karlsson, Ylva (preses)
Roos, Göran,MDInst. för medicinsk biovetenskap, Umeå (opponent)
Uppsala universitetInstitutionen för genetik och patologi (creator_code:org_t)

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Av författaren/redakt...: Lindkvist, Anna, ...; Paulsson-Karlsso ...; Roos, Göran, MD

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MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Klinisk medicin; och Dermatologi och ...

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Av lärosätet: Uppsala universitet

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