Catuogno, Silvia (2011) MiR-34c may protect lung cancer cells from paclitaxel-induced apoptosis. [Tesi di dottorato] (Unpublished)

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Item Type:	Tesi di dottorato
Lingua:	English
Title:	MiR-34c may protect lung cancer cells from paclitaxel-induced apoptosis
Creators:	Creators Email Catuogno, Silvia silviacatuogno@virgilio.it
Date:	30 November 2011
Number of Pages:	142
Institution:	Università degli Studi di Napoli Federico II
Department:	Biologia e patologia cellullare e molecolare "L. Califano"
Scuola di dottorato:	Medicina molecolare
Dottorato:	Genetica e medicina molecolare
Ciclo di dottorato:	24
Coordinatore del Corso di dottorato:	nome email Nitsch, Lucio lucio.nitsch@unina.it
Tutor:	nome email De Franciscis, Vittorio defranci@unina.it
Date:	30 November 2011
Number of Pages:	142
Uncontrolled Keywords:	microRNA, apoptosis, NSCLC, p53, c-myc
Settori scientifico-disciplinari del MIUR:	Area 05 - Scienze biologiche > BIO/18 - Genetica
Date Deposited:	09 Dec 2011 12:38
Last Modified:	17 Jun 2014 06:03
URI:	http://www.fedoa.unina.it/id/eprint/8857

Abstract

MicroRNAs (miRNAs) constitute a class of small non-coding RNAs that negatively regulate gene expression at post-transcriptional level in a sequence specific manner. They are involved in many biological processes, including cell proliferation, apoptosis and differentiation, and are considered as promising new therapeutic targets for cancer. However, the identity of miRNAs involved in apoptosis and their respective targets remain largely unknown. Given the elevated complexity of miRNA regulation of gene expression, we performed a functional screening as an alternative strategy to identify those miRNAs that in lung cancer cells may interfere with the apoptotic process. To this aim we generated a derivative of the non-small cell lung carcinoma A549 cell line in which caspase-8, a critical upstream initiator of apoptosis, can be activated by the administration of the small dimerizer drug AP20187. We found a number of miRNAs that may rescue cell viability from caspase-8 activation. They included miRNAs already described as oncogenic such as miR-17, miR-135, miR-520, but also some miRNAs such as miR-124-1 and miR-34c for which a tumor suppressive role has been instead described or expected. Among them, miR-34c-5p markedly increased resistance to paclitaxel induced apoptosis. We demonstrate that Bmf (Bcl-2 modifying factor) is a target of miR-34c-5p and that its silencing, together with that of c-myc, a known target of miR-34c-5p, contributes to resistance to apoptosis induced by paclitaxel via p53 downregulation.

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