Anti-Tumor Effects of a Penetratin Peptide Targeting Transcription of E2F-1, 2 and 3a Is Enhanced When Used in Combination with Pemetrexed or Cisplatin

We tested the antitumor effects of a modified E2F peptide substituting D-Arg for L-Arg, conjugated to penetratin (PEP) against solid tumor cell lines and the CCRF-leukemia cell line, alone and in combination with pemetrexed or with cisplatin. For - studies, the peptide was encapsulated in PEGylated...

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Veröffentlicht in:Cancers 2021-02, Vol.13 (5), p.972
Hauptverfasser: Rather, Gulam Mohmad, Anyanwu, Michael, Minko, Tamara, Garbuzenko, Olga, Szekely, Zoltan, Bertino, Joseph R
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container_start_page 972
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creator Rather, Gulam Mohmad
Anyanwu, Michael
Minko, Tamara
Garbuzenko, Olga
Szekely, Zoltan
Bertino, Joseph R
description We tested the antitumor effects of a modified E2F peptide substituting D-Arg for L-Arg, conjugated to penetratin (PEP) against solid tumor cell lines and the CCRF-leukemia cell line, alone and in combination with pemetrexed or with cisplatin. For - studies, the peptide was encapsulated in PEGylated liposomes (PL-PEP) to increase half-life and stability. Prostate cancer (DU145 and PC3), breast cancer (MCF7, MDA-MB-468, and 4T1), lymphoma (CCRF-CEM), and non-small cell lung cancer (NSCLC) cell lines (H2009, H441, H1975, and H2228) were treated with D-Arg PEP in combination with cisplatin or pemetrexed. Western blot analysis was performed on the NSCLC for E2F-1, pRb, thymidylate synthase, and thymidine kinase. The H2009 cell line was selected for an - study. When the PEP was combined with cisplatin and tested against solid tumor cell lines and the CCRF-CEM leukemia cell line, there was a modest synergistic effect. A marked synergistic effect was seen when the combination of pemetrexed and the PEP was tested against the adenocarcinoma lung cancer cell lines. The addition of the PEP to pemetrexed enhanced the antitumor effects of pemetrexed in a xenograft of the H2009 in mice. The D-Arg PEP in combination with cisplatin caused synergistic cell kill against prostate, breast, lung cancers, and the CCRF-CEM cell line. Marked synergy resulted when the D-Arg PEP was used in combination with pemetrexed against the lung adenocarcinoma cell lines. A xenograft study using the PL-PEP in combination with pemetrexed showed enhanced anti-tumor effects compared to each drug alone.
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subjects Adenocarcinoma
Antitumor activity
Apoptosis
Breast cancer
Cell cycle
Cell growth
Cisplatin
Deoxyribonucleic acid
Dihydrofolate reductase
DNA
DNA damage
DNA repair
E2F protein
E2F1 protein
Enzymes
Gene amplification
Kinases
Lung cancer
Lymphoma
Mutation
Non-small cell lung carcinoma
Peptides
Phosphorylation
Prostate
Prostate cancer
Proteins
Small cell lung carcinoma
Solid tumors
Thymidine
Thymidine kinase
Thymidylate synthase
Transcription
Tumor cell lines
Tumors
Xenografts
title Anti-Tumor Effects of a Penetratin Peptide Targeting Transcription of E2F-1, 2 and 3a Is Enhanced When Used in Combination with Pemetrexed or Cisplatin
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