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oai:recercat.cat:2445/1774202025-12-05T13:03:14Zcom_2072_1057col_2072_478798col_2072_478916col_2072_478917col_2072_478929

00925njm 22002777a 4500 dc Grande, Lara author Bretones, Gabriel author Rosa-Garrido, Manuel author Garrido-Martin, Eva M. author Hernandez, Teresa author Fraile, Susana author Botella, Luisa M. author Alava, Enrique de author Vidal-Bel, August author García del Muro Solans, Xavier author Villanueva Garatachea, Alberto author Delgado, M. Dolores author Fernandez-Luna, Jose L. author 2021-05-19T11:15:56Z 2021-05-19T11:15:56Z 2012-08-03 2021-05-19T11:15:56Z Testicular germ cell tumors (TGCTs) are highly responsive to and curable by cisplatin-based chemotherapy even in advanced stages. We have studied the molecular mechanisms involved in the induction of apoptosis in response to cisplatin, and found that proapoptotic Noxa is transcriptionally up-regulated following cisplatin exposure, even in the absence of p53, in NTERA2 cisplatin-sensitive cells but not in 1411HP-resistant cells. Blockade of Noxa reduced the apoptotic response of embryonal carcinoma (EC) NTERA2 cells to cisplatin. A detailed analysis of the Noxa promoter revealed that p73 and Sp1-like factors, Sp1 and KLF6, played key roles in the transcriptional control of this gene. Overexpression of TAp73 induced Noxa whereas the dominant negative isoform ΔNp73, reduced the levels of Noxa after cisplatin exposure in NTERA2 and 2102EP. Interestingly, down-regulation of Sp1 increased Noxa expression in response to cisplatin. However, blockade of KLF6 decreased cisplatin-induced up-regulation of Noxa in EC cell lines. In addition, tissue microarray analyses of TGCTs revealed that expression of Noxa correlates with good clinical prognosis in patients with embryonal carcinoma. Thus, our data show the transcriptional network that regulates Noxa in EC cells, which is key for their apoptotic response to cisplatin-based chemotherapy, and propose Noxa as a predictive factor of therapeutic response. Apoptosi Fisiologia Càncer Cisplatí ADN Expressió gènica Proteïnes supressores de tumors Apoptosis Physiology Cancer Cisplatin DNA Gene expression Tumor suppressor protein Transcription factors Sp1 and p73 control the expression of the proapoptotic protein NOXA in the response of testicular embryonal carcinoma cells to cisplatin