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Gemcitabine resistance mediated by ribonucleotide reductase M2 in lung squamous cell carcinoma is reversed by GW8510 through autophagy induction.

Identifieur interne : 000C34 ( Main/Exploration ); précédent : 000C33; suivant : 000C35

Gemcitabine resistance mediated by ribonucleotide reductase M2 in lung squamous cell carcinoma is reversed by GW8510 through autophagy induction.

Auteurs : Ping Chen [République populaire de Chine] ; Jian-Nong Wu [République populaire de Chine] ; Yang Shu [République populaire de Chine] ; He-Guo Jiang [République populaire de Chine] ; Xiao-Hui Zhao [République populaire de Chine] ; Hai Qian [République populaire de Chine] ; Kang Chen [République populaire de Chine] ; Ting Lan [République populaire de Chine] ; Chen-Guo Chen [République populaire de Chine] ; Jian Li [Oman]

Source :

RBID : pubmed:29853661

Descripteurs français

English descriptors

Abstract

Although chemotherapeutic regimen containing gemcitabine is the first-line therapy for advanced lung squamous cell carcinoma (LSCC), gemcitabine resistance remains an important clinical problem. Some studies suggest that overexpressions of ribonucleotide reductase (RNR) subunit M2 (RRM2) may be involved in gemcitabine resistance. We used a novel RRM2 inhibitor, GW8510, as a gemcitabine sensitization agent to investigate the therapeutic utility in reversing gemcitabine resistance in LSCC. Results showed that the expressions of RRM2 were increased in gemcitabine intrinsic resistant LSCC cells upon gemcitabine treatment. GW8510 not only suppressed LSCC cell survival, but also sensitized gemcitabine-resistant cells to gemcitabine through autophagy induction mediated by RRM2 down-regulation along with decrease in dNTP levels. The combination of GW8510 and gemcitabine produced a synergistic effect on killing LSCC cells. The synergism of the two agents was impeded by addition of autophagy inhibitors chloroquine (CQ) or bafilomycin A1 (Baf A1), or knockdown of the autophagy gene, Bcl-2-interacting protein 1 (BECN1). Moreover, GW8510-caused LSCC cell sensitization to gemcitabine through autophagy induction was parallel with impairment of DNA double-strand break (DSB) repair and marked increase in cell apoptosis, revealing a cross-talk between autophagy and DNA damage repair, and an interplay between autophagy and apoptosis. Finally, gemcitabine sensitization mediated by autophagy induction through GW8510-caused RRM2 down-regulation was demonstrated in vivo in gemcitabine-resistant LSCC tumor xenograft, further indicating that the sensitization is dependent on autophagy activation. In conclusion, GW8510 can reverse gemcitabine resistance in LSCC cells through RRM2 downregulation-mediated autophagy induction, and GW850 may be a promising therapeutic agent against LSCC as it combined with gemcitabine.

DOI: 10.1042/CS20180010
PubMed: 29853661


Affiliations:


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<term>Animals</term>
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<term>Autophagy (drug effects)</term>
<term>Carcinoma, Squamous Cell (drug therapy)</term>
<term>Carcinoma, Squamous Cell (enzymology)</term>
<term>Carcinoma, Squamous Cell (pathology)</term>
<term>Deoxycytidine (analogs & derivatives)</term>
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<term>Deoxycytidine</term>
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<term>Carcinome épidermoïde</term>
<term>Tumeurs du poumon</term>
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<term>Tumeurs du poumon</term>
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<term>Lung Neoplasms</term>
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<term>Lung Neoplasms</term>
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<term>Désoxycytidine</term>
<term>Indoles</term>
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<term>Ribonucleoside diphosphate reductase</term>
<term>Résistance aux médicaments antinéoplasiques</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en">
<term>Drug Resistance, Neoplasm</term>
<term>Ribonucleoside Diphosphate Reductase</term>
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<term>Tumeurs du poumon</term>
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<div type="abstract" xml:lang="en">Although chemotherapeutic regimen containing gemcitabine is the first-line therapy for advanced lung squamous cell carcinoma (LSCC), gemcitabine resistance remains an important clinical problem. Some studies suggest that overexpressions of ribonucleotide reductase (RNR) subunit M2 (RRM2) may be involved in gemcitabine resistance. We used a novel RRM2 inhibitor, GW8510, as a gemcitabine sensitization agent to investigate the therapeutic utility in reversing gemcitabine resistance in LSCC. Results showed that the expressions of RRM2 were increased in gemcitabine intrinsic resistant LSCC cells upon gemcitabine treatment. GW8510 not only suppressed LSCC cell survival, but also sensitized gemcitabine-resistant cells to gemcitabine through autophagy induction mediated by RRM2 down-regulation along with decrease in dNTP levels. The combination of GW8510 and gemcitabine produced a synergistic effect on killing LSCC cells. The synergism of the two agents was impeded by addition of autophagy inhibitors chloroquine (CQ) or bafilomycin A1 (Baf A1), or knockdown of the autophagy gene, Bcl-2-interacting protein 1 (
<i>BECN1</i>
). Moreover, GW8510-caused LSCC cell sensitization to gemcitabine through autophagy induction was parallel with impairment of DNA double-strand break (DSB) repair and marked increase in cell apoptosis, revealing a cross-talk between autophagy and DNA damage repair, and an interplay between autophagy and apoptosis. Finally, gemcitabine sensitization mediated by autophagy induction through GW8510-caused RRM2 down-regulation was demonstrated
<i>in vivo</i>
in gemcitabine-resistant LSCC tumor xenograft, further indicating that the sensitization is dependent on autophagy activation. In conclusion, GW8510 can reverse gemcitabine resistance in LSCC cells through RRM2 downregulation-mediated autophagy induction, and GW850 may be a promising therapeutic agent against LSCC as it combined with gemcitabine.</div>
</front>
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<name sortKey="Li, Jian" sort="Li, Jian" uniqKey="Li J" first="Jian" last="Li">Jian Li</name>
</noRegion>
</country>
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</affiliations>
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Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Sante/explor/ChloroquineV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000C34 | SxmlIndent | more

Ou

HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000C34 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Sante
   |area=    ChloroquineV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     pubmed:29853661
   |texte=   Gemcitabine resistance mediated by ribonucleotide reductase M2 in lung squamous cell carcinoma is reversed by GW8510 through autophagy induction.
}}

Pour générer des pages wiki

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Data generation: Wed Mar 25 22:43:59 2020. Site generation: Sun Jan 31 12:44:45 2021