scholarly journals Development of a series of bis-triazoles as G-quadruplex ligands

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47297-47308 ◽  
Author(s):  
Maysaa M. Saleh ◽  
Charles A. Laughton ◽  
Tracey D. Bradshaw ◽  
Christopher J. Moody
Keyword(s):  
Cancer Cells ◽  
Enzyme Complex ◽  
Normal Cells ◽  
G Quadruplex ◽  
Key Factor

Maintenance of telomeres – specialized complexes that protect the ends of chromosomes – is provided by the enzyme complex telomerase, which is a key factor that is activated in more than 80% of cancer cells, but absent in most normal cells.

Molecular Studies on Novel Antitumor Bis 1,4-Dihydropyridine Derivatives Against Lung Carcinoma and their Limited Side Effects on Normal Melanocytes

2019 ◽  
Vol 18 (15) ◽  
pp. 2156-2168 ◽  
Author(s):  
Magda F. Mohamed ◽  
Nada S. Ibrahim ◽  
Ahmed H.M. Elwahy ◽  
Ismail A. Abdelhamid
Keyword(s):  
Breast Cancer ◽  
Side Effects ◽  
Cancer Cells ◽  
Cell Line ◽  
Lung Carcinoma ◽  
Carcinoma Cell ◽  
Normal Cells ◽  
Lung Carcinoma Cell Line ◽  
Molecular Studies ◽  
Dihydropyridine Derivatives

Background: Cancer is a complex genetic disease which is characterized by an abnormal cell growth, invasion and spreading to other parts of the body. There are several factors that lead to cancer by causing DNA damage and the impairment of its repair. Treatment of cancer using the chemotherapeutic drugs have adverse side effects such as toxicity as they lose their specificity toward cancer cells and affect also normal cells. Moreover, the cancer cells can resist the chemotherapeutic agents and make them ineffective. For these reasons, much attentions have been paid to develop new drugs with limited side effects on normal cells and to diminish cancer resistance to drug chemotherapy. Recently, some 1,4-dihydropyridine derivatives were reported to act as Multi-Drug Resistance (MDR) modulators that inhibit p-glycoprotein which is responsible for the inability of drugs to enter the cancer cells. Also 1,4-DHPs have antimutagenic properties against chemicals via modulating DNA repair when studied on drosophila. Objective: The objective of this study is the synthesis of bis 1,4-DHPs incorporating ester as well as ether linkages and evaluate the anticancer activity of new compounds for synergistic purpose. Different genetic tools were used in an attempt to know the mechanism of action of this compound against lung cancer. Method: An efficient one pot synthesis of bis 1,4-DHPs using 3-aminocrotononitrile and bis(aldehydes) has been developed. The cytotoxic effect against human cell lines MCF7, and A549 cell lines was evaluated. Results: All compounds exhibited better cytotoxicity toward lung carcinoma cells than breast cancer cells. With respect to lung carcinoma cell line (A549), compound 10 was the most active compound and the three other compounds 7, 8, and 9 showed comparable IC50 values. In case of breast cancer cell line (MCF7), the most active one was compound 7, while compound 8 recorded the least activity. Conclusion: we have developed an efficient method for the synthesis of novel bis 1,4-dihydropyridine derivatives incorporating ester or ether linkage. All compounds showed better cytotoxicity results against A549 than MCF7, so that lung carcinoma cell line was chosen to perform the molecular studies on it. The results showed that all compounds (7, 8, 9 and 10) caused cell cycle arrest at G1 phase. The molecular docking study on CDK2 confirmed the results of cell cycle assay which showed good binding energy between the compounds and the active site of enzyme indicating the inhibition of the enzyme.

scholarly journals Normal cells repel WWOX-negative or -dysfunctional cancer cells via WWOX cell surface epitope 286-299

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yu-An Chen ◽  
Yong-Da Sie ◽  
Tsung-Yun Liu ◽  
Hsiang-Ling Kuo ◽  
Pei-Yi Chou ◽  
...  
Keyword(s):  
Cell Surface ◽  
Cancer Cells ◽  
Room Temperature ◽  
Metastatic Cancer ◽  
Normal Cells ◽  
Tgfβ Receptor ◽  
Membrane Type ◽  
Cell Invasiveness ◽  
And Control ◽  
Metastatic Cancer Cells

AbstractMetastatic cancer cells are frequently deficient in WWOX protein or express dysfunctional WWOX (designated WWOXd). Here, we determined that functional WWOX-expressing (WWOXf) cells migrate collectively and expel the individually migrating WWOXd cells. For return, WWOXd cells induces apoptosis of WWOXf cells from a remote distance. Survival of WWOXd from the cell-to-cell encounter is due to activation of the survival IκBα/ERK/WWOX signaling. Mechanistically, cell surface epitope WWOX286-299 (repl) in WWOXf repels the invading WWOXd to undergo retrograde migration. However, when epitope WWOX7-21 (gre) is exposed, WWOXf greets WWOXd to migrate forward for merge. WWOX binds membrane type II TGFβ receptor (TβRII), and TβRII IgG-pretreated WWOXf greet WWOXd to migrate forward and merge with each other. In contrast, TβRII IgG-pretreated WWOXd loses recognition by WWOXf, and WWOXf mediates apoptosis of WWOXd. The observatons suggest that normal cells can be activated to attack metastatic cancer cells. WWOXd cells are less efficient in generating Ca2+ influx and undergo non-apoptotic explosion in response to UV irradiation in room temperature. WWOXf cells exhibit bubbling cell death and Ca2+ influx effectively caused by UV or apoptotic stress. Together, membrane WWOX/TβRII complex is needed for cell-to-cell recognition, maintaining the efficacy of Ca2+ influx, and control of cell invasiveness.

scholarly journals Quantum Dots as a Good Carriers of Unsymmetrical Bisacridines for Modulating Cellular Uptake and the Biological Response in Lung and Colon Cancer Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 462 ◽  
Author(s):  
Joanna Pilch ◽  
Patrycja Kowalik ◽  
Piotr Bujak ◽  
Anna M. Nowicka ◽  
Ewa Augustin
Keyword(s):  
Quantum Dots ◽  
Cancer Cells ◽  
Cellular Uptake ◽  
Laser Scanning ◽  
Biological Response ◽  
Drug Carriers ◽  
Confocal Laser ◽  
Normal Cells ◽  
H460 Cells ◽  
Hct116 Cells

Nanotechnology-based drug delivery provides a promising area for improving the efficacy of cancer treatments. Therefore, we investigate the potential of using quantum dots (QDs) as drug carriers for antitumor unsymmetrical bisacridine derivatives (UAs) to cancer cells. We examine the influence of QD–UA hybrids on the cellular uptake, internalization (Confocal Laser Scanning Microscope), and the biological response (flow cytometry and light microscopy) in lung H460 and colon HCT116 cancer cells. We show the time-dependent cellular uptake of QD–UA hybrids, which were more efficiently retained inside the cells compared to UAs alone, especially in H460 cells, which could be due to multiple endocytosis pathways. In contrast, in HCT116 cells, the hybrids were taken up only by one endocytosis mechanism. Both UAs and their hybrids induced apoptosis in H460 and HCT116 cells (to a greater extent in H460). Cells which did not die underwent senescence more efficiently following QDs–UAs treatment, compared to UAs alone. Cellular senescence was not observed in HCT116 cells following treatment with both UAs and their hybrids. Importantly, QDgreen/red themselves did not provoke toxic responses in cancer or normal cells. In conclusion, QDs are good candidates for targeted UA delivery carriers to cancer cells while protecting normal cells from toxic drug activities.

scholarly journals The Exon Junction Complex Core Represses Cancer-Specific Mature mRNA Re-Splicing: A Potential Key Role in Terminating Splicing

2021 ◽  
Vol 22 (12) ◽  
pp. 6519
Author(s):  
Yuta Otani ◽  
Ken-ichi Fujita ◽  
Toshiki Kameyama ◽  
Akila Mayeda
Keyword(s):  
Cancer Cells ◽  
Control Factor ◽  
Exon Junction Complex ◽  
Core Component ◽  
Normal Cells ◽  
Knock Down ◽  
Exon Junction ◽  
Mature Mrna ◽  
Complex Core ◽  
Specific Mrna

Using TSG101 pre-mRNA, we previously discovered cancer-specific re-splicing of mature mRNA that generates aberrant transcripts/proteins. The fact that mRNA is aberrantly re-spliced in various cancer cells implies there must be an important mechanism to prevent deleterious re-splicing on the spliced mRNA in normal cells. We thus postulated that mRNA re-splicing is controlled by specific repressors, and we searched for repressor candidates by siRNA-based screening for mRNA re-splicing activity. We found that knock-down of EIF4A3, which is a core component of the exon junction complex (EJC), significantly promoted mRNA re-splicing. Remarkably, we could recapitulate cancer-specific mRNA re-splicing in normal cells by knock-down of any of the core EJC proteins, EIF4A3, MAGOH, or RBM8A (Y14), implicating the EJC core as the repressor of mRNA re-splicing often observed in cancer cells. We propose that the EJC core is a critical mRNA quality control factor to prevent over-splicing of mature mRNA.

scholarly journals Monohydrazone Based G-Quadruplex Selective Ligands Induce DNA Damage and Genome Instability in Human Cancer Cells

2020 ◽  
Vol 63 (6) ◽  
pp. 3090-3103 ◽  
Author(s):  
Jussara Amato ◽  
Giulia Miglietta ◽  
Rita Morigi ◽  
Nunzia Iaccarino ◽  
Alessandra Locatelli ◽  
...  
Keyword(s):  
Dna Damage ◽  
Cancer Cells ◽  
Genome Instability ◽  
Human Cancer ◽  
Human Cancer Cells ◽  
G Quadruplex ◽  
Selective Ligands

scholarly journals The wages of CIN

2008 ◽  
Vol 180 (4) ◽  
pp. 661-663 ◽  
Author(s):  
Karen W. Yuen ◽  
Arshad Desai
Keyword(s):  
Cancer Cells ◽  
Solid Tumors ◽  
Chromosomal Instability ◽  
Chromosome Instability ◽  
Spindle Checkpoint ◽  
Human Cells ◽  
Normal Cells ◽  
Chromosome Missegregation ◽  
Cell Biol ◽  
The Relationship

Aneuploidy and chromosome instability (CIN) are hallmarks of the majority of solid tumors, but the relationship between them is not well understood. In this issue, Thompson and Compton (Thompson, S.L., and D.A. Compton. 2008. Examining the link between chromosomal instability and aneuploidy in human cells. J. Cell. Biol. 180:665–672) investigate the mechanism of CIN in cancer cells and find that CIN arises primarily from defective kinetochore–spindle attachments that evade detection by the spindle checkpoint and persist into anaphase. They also explore the consequences of artificially elevating chromosome missegregation in otherwise karyotypically normal cells. Their finding that induced aneuploidy is rapidly selected against suggests that the persistence of aneuploid cells in tumors requires not only chromosome missegregation but also additional, as yet poorly defined events.

Cell biology: How cancer cells coerce normal cells into tumorigenesis

2021 ◽  
Vol 31 (15) ◽  
pp. R957-R959
Author(s):  
Sushila Ganguli ◽  
Helen K. Matthews
Keyword(s):  
Cancer Cells ◽  
Cell Biology ◽  
Normal Cells
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