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PML and TRF2 protein expression in hereditary and sporadic colon cancer
P Plevova, J Bouchal, M Fiuraskova, M Papezova, A Krepelova, R Curik, L Foretova, M Navratilova, J Zapletalova, T Posolda, Z Kolar
Jazyk angličtina Země Slovensko
- MeSH
- adaptorové proteiny signální transdukční genetika MeSH
- DNA nádorová MeSH
- dospělí MeSH
- financování organizované MeSH
- homolog 2 proteinu MutS genetika MeSH
- jaderné proteiny genetika metabolismus MeSH
- kolorektální nádory genetika metabolismus patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mikrosatelitní nestabilita MeSH
- mikrosatelitní repetice MeSH
- mucinózní adenokarcinom genetika metabolismus patologie MeSH
- nádorové buňky kultivované MeSH
- nádorové proteiny metabolismus MeSH
- nádorové supresorové proteiny metabolismus MeSH
- nádory genetika metabolismus patologie MeSH
- polymerázová řetězová reakce MeSH
- protein TRF2 metabolismus MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- telomerasa metabolismus MeSH
- telomery fyziologie MeSH
- transkripční faktory metabolismus MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
The PML (promyelocytic leukemia) protein is concentrated in the PML nuclear bodies. In human cell lines and tumors maintaining their telomeres by alternative lengthening (ALT), the PML protein is colocalized with TRF2 and several other proteins in the so called ALT-associated PML bodies. The aim of this study was to determine if there is any difference in PML protein expression between tumors with stable microsatellites (MSS) and those with high-frequency microsatellite instability (MSI-H), if PML protein expression might be a prognostic factor and if MSI-H tumors more frequently use alternative lengthening of telomeres measured by the presence of ALT-associated PML bodies. Eighty colorectal cancer samples (32 MSI-H and 48 MSS) and 8 human tumor cell lines (Saos-2, U2OS, DU145, LNCaP, U87, HeLa, MCF7 and T98G) were included into the study. Double-colour immunofluorescence staining was used. Downregulation of PML protein expression was found in 7 of 32 (22%) MSI-H and 11 of 48 (23%) MSS tumors (p=0.520). There was no correlation between PML expression and age, histological typing, localization of the tumor in colon, TNM classification, disease-free and overall survival. The Saos-2 and U2OS (ALT using cell lines) and the MCF7 (active telomerase) cell line were characterized by the presence of ALT-associated PML bodies; no such bodies were detected in the DU145, LNCaP, U87, HeLa and T98G cell lines (active telomerase); accumulation of TRF2 was absent or much weaker in these cell lines compared to Saos-2 or U2OS. Accumulation of the TRF2 protein was detected in 16 of 80 (20%) tumors and PML and TRF2 colocalization in 2 MSI-H tumors (6%). In conclusion, the PML protein was downregulated in approximately 20% of tumors; there was no difference between MSS and MSI-H tumors. PML protein expression does not seem to be a prognostic factor.
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- $a Plevová, Pavlína $7 xx0044813
- 245 10
- $a PML and TRF2 protein expression in hereditary and sporadic colon cancer / $c P Plevova, J Bouchal, M Fiuraskova, M Papezova, A Krepelova, R Curik, L Foretova, M Navratilova, J Zapletalova, T Posolda, Z Kolar
- 314 __
- $a Institute of Pathology and Laboratory of Molecular Pathology, Medical Faculty of the Palacky University, Olomouc, Czech Republic pavlina.plevova@volny.cz
- 520 9_
- $a The PML (promyelocytic leukemia) protein is concentrated in the PML nuclear bodies. In human cell lines and tumors maintaining their telomeres by alternative lengthening (ALT), the PML protein is colocalized with TRF2 and several other proteins in the so called ALT-associated PML bodies. The aim of this study was to determine if there is any difference in PML protein expression between tumors with stable microsatellites (MSS) and those with high-frequency microsatellite instability (MSI-H), if PML protein expression might be a prognostic factor and if MSI-H tumors more frequently use alternative lengthening of telomeres measured by the presence of ALT-associated PML bodies. Eighty colorectal cancer samples (32 MSI-H and 48 MSS) and 8 human tumor cell lines (Saos-2, U2OS, DU145, LNCaP, U87, HeLa, MCF7 and T98G) were included into the study. Double-colour immunofluorescence staining was used. Downregulation of PML protein expression was found in 7 of 32 (22%) MSI-H and 11 of 48 (23%) MSS tumors (p=0.520). There was no correlation between PML expression and age, histological typing, localization of the tumor in colon, TNM classification, disease-free and overall survival. The Saos-2 and U2OS (ALT using cell lines) and the MCF7 (active telomerase) cell line were characterized by the presence of ALT-associated PML bodies; no such bodies were detected in the DU145, LNCaP, U87, HeLa and T98G cell lines (active telomerase); accumulation of TRF2 was absent or much weaker in these cell lines compared to Saos-2 or U2OS. Accumulation of the TRF2 protein was detected in 16 of 80 (20%) tumors and PML and TRF2 colocalization in 2 MSI-H tumors (6%). In conclusion, the PML protein was downregulated in approximately 20% of tumors; there was no difference between MSS and MSI-H tumors. PML protein expression does not seem to be a prognostic factor.
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