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Abstract:

FK506-binding proteins are members of the immunophilin family of proteins. Those immunophilins associated to the 90-kDa-heat-shock protein, Hsp90, have been proposed as potential modulators of signalling cascade factors chaperoned by Hsp90. FKBP51 and FKBP52 are the best characterized Hsp90-bound immunophilins first described associated to steroid-receptors. The reverse transcriptase subunit of telomerase, hTERT, is also an Hsp90 client-protein and is highly expressed in cancer cells, where it is required to compensate the loss of telomeric DNA after each successive cell division. Because FKBP51 is also a highly expressed protein in cancer tissues, we analyzed its potential association with hTERT·Hsp90 complexes and its possible biological role. In this study it is demonstrated that both immunophilins, FKBP51 and FKBP52, co-immunoprecipitate with hTERT. The Hsp90 inhibitor radicicol disrupts the heterocomplex and favors the partial cytoplasmic relocalization of hTERT in similar manner as the overexpression of the TPR-domain peptide of the immunophilin. While confocal microscopy images show that FKBP51 is primarily localized in mitochondria and hTERT is totally nuclear, upon the onset of oxidative stress, FKBP51 (but not FKBP52) becomes mostly nuclear colocalizing with hTERT, and longer exposure times to peroxide favors hTERT export to mitochondria. Importantly, telomerase activity of hTERT is significantly enhanced by FKBP51. These observations support the emerging role assigned to FKBP51 as antiapoptotic factor in cancer development and progression, and describe for the first time the potential role of this immunophilin favoring the clonal expansion by enhancing telomerase activity. © 2016 Federation of European Biochemical Societies

Registro:

Documento: Artículo
Título:Hsp90-binding immunophilin FKBP51 forms complexes with hTERT enhancing telomerase activity
Autor:Lagadari, M.; Zgajnar, N.R.; Gallo, L.I.; Galigniana, M.D.
Filiación:Instituto de Biología y Medicina Experimental (IBYME)-CONICET, Buenos Aires, C1428ADN, Argentina
Instituto de Fisiología, Biología Molecular y Neurociencias (CONICET) & Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Palabras clave:FKBP51; FKBP52; Hsp90; hTERT; Immunophilin; Telomerase; fk 506 binding protein; fk 506 binding protein 51; fk 506 binding protein 52; heat shock protein 90; peroxide; proteasome; radicicol; reactive oxygen metabolite; telomerase; telomerase reverse transcriptase; unclassified drug; fk 506 binding protein; heat shock protein 90; protein binding; tacrolimus binding protein 5; telomerase; algorithm; Article; cancer cell; cell fractionation; cell nucleus; cell survival; cellular distribution; confocal microscopy; controlled study; cytoplasm; enzyme activity; fibroblast; gene overexpression; genetic background; human; human cell; immunofluorescence; immunoprecipitation; interphase; mitochondrion; oxidative stress; priority journal; protein localization; quantitative analysis; Western blotting; metabolism; protein degradation; tumor cell line; Cell Line, Tumor; Cell Nucleus; Cell Survival; HSP90 Heat-Shock Proteins; Humans; Mitochondria; Oxidative Stress; Proteasome Endopeptidase Complex; Protein Binding; Proteolysis; Tacrolimus Binding Proteins; Telomerase
Año:2016
Volumen:10
Número:7
Página de inicio:1086
Página de fin:1098
DOI: http://dx.doi.org/10.1016/j.molonc.2016.05.002
Título revista:Molecular Oncology
Título revista abreviado:Mol. Oncol.
ISSN:15747891
CAS:peroxide, 14915-07-2; proteasome, 140879-24-9; radicicol, 12772-57-5; telomerase reverse transcriptase, 120178-12-3; HSP90 Heat-Shock Proteins; Proteasome Endopeptidase Complex; tacrolimus binding protein 5; Tacrolimus Binding Proteins; Telomerase
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15747891_v10_n7_p1086_Lagadari

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Citas:

---------- APA ----------
Lagadari, M., Zgajnar, N.R., Gallo, L.I. & Galigniana, M.D. (2016) . Hsp90-binding immunophilin FKBP51 forms complexes with hTERT enhancing telomerase activity. Molecular Oncology, 10(7), 1086-1098.
http://dx.doi.org/10.1016/j.molonc.2016.05.002
---------- CHICAGO ----------
Lagadari, M., Zgajnar, N.R., Gallo, L.I., Galigniana, M.D. "Hsp90-binding immunophilin FKBP51 forms complexes with hTERT enhancing telomerase activity" . Molecular Oncology 10, no. 7 (2016) : 1086-1098.
http://dx.doi.org/10.1016/j.molonc.2016.05.002
---------- MLA ----------
Lagadari, M., Zgajnar, N.R., Gallo, L.I., Galigniana, M.D. "Hsp90-binding immunophilin FKBP51 forms complexes with hTERT enhancing telomerase activity" . Molecular Oncology, vol. 10, no. 7, 2016, pp. 1086-1098.
http://dx.doi.org/10.1016/j.molonc.2016.05.002
---------- VANCOUVER ----------
Lagadari, M., Zgajnar, N.R., Gallo, L.I., Galigniana, M.D. Hsp90-binding immunophilin FKBP51 forms complexes with hTERT enhancing telomerase activity. Mol. Oncol. 2016;10(7):1086-1098.
http://dx.doi.org/10.1016/j.molonc.2016.05.002