scholarly journals Targeting centrosome amplification, an Achilles' heel of cancer

2019 ◽  
Vol 47 (5) ◽  
pp. 1209-1222 ◽  
Author(s):  
Dorota Sabat-Pośpiech ◽  
Kim Fabian-Kolpanowicz ◽  
Ian A. Prior ◽  
Judy M. Coulson ◽  
Andrew B. Fielding
Keyword(s):  
Cell Cycle ◽  
Clinical Trials ◽  
Cell Growth ◽  
Cancer Cells ◽  
Small Molecule ◽  
Small Molecule Inhibitors ◽  
Centrosome Amplification ◽  
Specific Inhibition ◽  
Therapeutic Gain ◽  
Recent Developments

Abstract Due to cell-cycle dysregulation, many cancer cells contain more than the normal compliment of centrosomes, a state referred to as centrosome amplification (CA). CA can drive oncogenic phenotypes and indeed can cause cancer in flies and mammals. However, cells have to actively manage CA, often by centrosome clustering, in order to divide. Thus, CA is also an Achilles' Heel of cancer cells. In recent years, there have been many important studies identifying proteins required for the management of CA and it has been demonstrated that disruption of some of these proteins can cause cancer-specific inhibition of cell growth. For certain targets therapeutically relevant interventions are being investigated, for example, small molecule inhibitors, although none are yet in clinical trials. As the field is now poised to move towards clinically relevant interventions, it is opportune to summarise the key work in targeting CA thus far, with particular emphasis on recent developments where small molecule or other strategies have been proposed. We also highlight the relatively unexplored paradigm of reversing CA, and thus its oncogenic effects, for therapeutic gain.

Structure-based Drug Design Strategies in the Development of Small Molecule Inhibitors Targeting Bcl-2 Family Proteins

2020 ◽  
Vol 17 (8) ◽  
pp. 943-953
Author(s):  
Zhe Yin ◽  
Donglin Yang ◽  
Jun Wang ◽  
Yuequan Jiang
Keyword(s):  
Clinical Trials ◽  
Drug Design ◽  
B Cell ◽  
Cancer Cells ◽  
Small Molecule ◽  
Small Molecule Inhibitors ◽  
Cell Lymphoma ◽  
B Cell Lymphoma ◽  
Design Strategies ◽  
Structure Based Drug Design

Proteins of B-cell lymphoma (Bcl-2) family are key regulators of apoptosis and are involved in the pathogenesis of various cancers. Disrupting the interactions between the antiapoptotic and proapoptotic Bcl-2 members is an attractive strategy to reactivate the apoptosis of cancer cells. Structure-based drug design (SBDD) has been successfully applied to the discovery of small molecule inhibitors targeting Bcl-2 proteins in past decades. Up to now, many Bcl-2 inhibitors with different paralogue selectivity profiles have been developed and some were used in clinical trials. This review focused on the recent applications of SBDD strategies in the development of small molecule inhibitors targeting Bcl-2 family proteins.

Effect of a small-molecule MDM2/MDMX inhibitor on cell cycle arrest and apoptosis in breast cancer cells.

2013 ◽  
Vol 31 (15_suppl) ◽  
pp. e22096-e22096
Author(s):  
Qian Qian Geng ◽  
En Xiao Li ◽  
Dan Feng Dong ◽  
Yin Ying Wu ◽  
Jie Wang ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Growth ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Small Molecule ◽  
Breast Cancer Cells ◽  
Breast Cancer Cell Lines ◽  
Cycle Arrest ◽  
Mdm2 Inhibitor

e22096 Background: The MDM2 inhibitor which disrupted the MDM2-p53 interaction made little effort on the activation of p53 for breast cancer treatments, due to MDMX over expression. Previously a small molecule inhibitor targeting at MDM2 and MDMX had been successfully synthesized. We tested anti-tumor activity of the small molecule MDM2/MDMX inhibitor, compared with nutlin-3α, a well characterized MDM2 inhibitor, in the wild-type (wt) and mutant (mt) p53 breast cancer cell lines. Methods: Human breast cancer cell lines MCF-7 (wt-p53), ZR-7530 (wt-p53), BT-474 (mt-p53) and MDA-MB-231 (mt-p53) were cultured and treated with the small molecule MDM2/MDMX inhibitor, nutlin-3α or phosphate buffer solution (PBS) for 48 hrs separately. MTT for cell viability, FCM for cell cycle arrest and Annexin V FITC/PI for cell apoptosis were performed. The mechanism of antitumor activity of the small molecule MDM2/MDMX inhibitor was determined by Western-Blot analysis. Results: The inhibitor of MDM2 and MDMX inhibited cell growth and induced cell cycle arrest and apoptosis in mt-p53 breast cancer cells while nutlin-3α cannot. In the breast cancer cells with wt-p53, both of them inhibited cell growth, induced cell cycle arrest and apoptosis, but MDM2/MDMX inhibitor was proven to be more effective. Western Blot revealed that there was higher level of p53 expression in breast cancer cells treated with MDM2/MDMX inhibitor than nutlin-3α. The marked increases in p21, Bax and PUMA expressions were abserved in both wt-p53 and mt-p53 breast cancer cells which indicated that the small molecule MDM2/MDMX inhibitor induced cell apoptosis through p21, Bax and PUMA over expressions. Conclusions: The small molecule MDM2/MDMX inhibitor would be able to suppress cell proliferation, induce cell cycle arrest and apoptosis, activate p53 more effective than nutlin-3α in breast cancer cells, no matter with p53 status. P21, Bax and PUMA were involved in the mechanism of apoptosis induction. The inhibitor of targeting at both MDM2 and MDMX will be a novel treatment for breast cancer p53-independent status in the future.

Targeting p53-MDM2 Interaction Using Small Molecule Inhibitors and the Challenges Needed to be Addressed

2019 ◽  
Vol 20 (11) ◽  
pp. 1091-1111 ◽  
Author(s):  
Maryam Zanjirband ◽  
Soheila Rahgozar
Keyword(s):  
Clinical Trials ◽  
Small Molecule ◽  
Small Molecule Inhibitors ◽  
Tp53 Gene ◽  
Therapeutic Agents ◽  
Negative Regulator ◽  
Mdm2 Protein ◽  
Independent Effects ◽  
Small Hydrophobic ◽  
Targeted Therapeutic

MDM2 protein is the core negative regulator of p53 that maintains the cellular levels of p53 at a low level in normal cells. Mutation of the TP53 gene accounts for 50% of all human cancers. In the remaining malignancies with wild-type TP53, p53 function is inhibited through other mechanisms. Recently, synthetic small molecule inhibitors have been developed which target a small hydrophobic pocket on MDM2 to which p53 normally binds. Given that MDM2-p53 antagonists have been undergoing clinical trials for different types of cancer, this review illustrates different aspects of these new cancer targeted therapeutic agents with the focus on the major advances in the field. It emphasizes on the p53 function, regulation of p53, targeting of the p53-MDM2 interaction for cancer therapy, and p53-dependent and -independent effects of inhibition of p53-MDM2 interaction. Then, representatives of small molecule MDM2-p53 binding antagonists are introduced with a focus on those entered into clinical trials. Furthermore, the review discusses the gene signatures in order to predict sensitivity to MDM2 antagonists, potential side effects and the reasons for the observed hematotoxicity, mechanisms of resistance to these drugs, their evaluation as monotherapy or in combination with conventional chemotherapy or with other targeted therapeutic agents. Finally, it highlights the certainly intriguing questions and challenges which would be addressed in future studies.

Novel small molecule inhibitor of Kpnβ1 induces cell cycle arrest and apoptosis in cancer cells

2021 ◽  
pp. 112637
Author(s):  
Aderonke Ajayi-Smith ◽  
Pauline van der Watt ◽  
Nonkululeko Mkwanazi ◽  
Sarah Carden ◽  
John O. Trent ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Small Molecule ◽  
Small Molecule Inhibitor ◽  
Cycle Arrest ◽  
Molecule Inhibitor ◽  
Apoptosis In Cancer Cells

scholarly journals Mutant p53L194F Harboring Luminal-A Breast Cancer Cells Are Refractory to Apoptosis and Cell Cycle Arrest in Response to MortaparibPlus, a Multimodal Small Molecule Inhibitor

Cancers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 3043
Author(s):  
Ahmed Elwakeel ◽  
Anissa Nofita Sari ◽  
Jaspreet Kaur Dhanjal ◽  
Hazna Noor Meidinna ◽  
Durai Sundar ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Small Molecule ◽  
Breast Cancer Cells ◽  
Luminal A ◽  
Molecular Analyses ◽  
Cycle Arrest ◽  
Mcf 7

We previously performed a drug screening to identify a potential inhibitor of mortalin–p53 interaction. In four rounds of screenings based on the shift in mortalin immunostaining pattern from perinuclear to pan-cytoplasmic and nuclear enrichment of p53, we had identified MortaparibPlus (4-[(1E)-2-(2-phenylindol-3-yl)-1-azavinyl]-1,2,4-triazole) as a novel synthetic small molecule. In order to validate its activity and mechanism of action, we recruited Luminal-A breast cancer cells, MCF-7 (p53wild type) and T47D (p53L194F) and performed extensive biochemical and immunocytochemical analyses. Molecular analyses revealed that MortaparibPlus is capable of abrogating mortalin–p53 interaction in both MCF-7 and T47D cells. Intriguingly, upregulation of transcriptional activation function of p53 (as marked by upregulation of the p53 effector gene—p21WAF1—responsible for cell cycle arrest and apoptosis) was recorded only in MortaparibPlus-treated MCF-7 cells. On the other hand, MortaparibPlus-treated T47D cells exhibited hyperactivation of PARP1 (accumulation of PAR polymer and decrease in ATP levels) as a possible non-p53 tumor suppression program. However, these cells did not show full signs of either apoptosis or PAR-Thanatos. Molecular analyses attributed such a response to the inability of MortaparibPlus to disrupt the AIF–mortalin complexes; hence, AIF did not translocate to the nucleus to induce chromatinolysis and DNA degradation. These data suggested that the cancer cells possessing enriched levels of such complexes may not respond to MortaparibPlus. Taken together, we report the multimodal anticancer potential of MortaparibPlus that warrants further attention in laboratory and clinical studies.

scholarly journals Oncogenic role of ALX3 in cervical cancer cells through KDM2B-mediated histone demethylation of CDC25A

BMC Cancer ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Jinhong Qi ◽  
Li Zhou ◽  
Dongqing Li ◽  
Jingyuan Yang ◽  
He Wang ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cervical Cancer ◽  
Cell Growth ◽  
Cancer Cells ◽  
Cell Cycle Progression ◽  
Cervical Squamous Cell Carcinoma ◽  
Cycle Progression ◽  
Normal Tissues ◽  
Positive Regulator ◽  
Cervical Cancer Cells

Abstract Background Cell division cycle 25A (CDC25A) is a well-recognized regulator of cell cycle progression and is involved in cancer development. This work focused on the function of CDC25A in cervical cancer cell growth and the molecules involved. Methods A GEO dataset GSE63514 comprising data of cervical squamous cell carcinoma (CSCC) tissues was used to screen the aberrantly expressed genes in cervical cancer. The CDC25A expression in cancer and normal tissues was predicted in the GEPIA database and that in CSCC and normal cells was determined by RT-qPCR and western blot assays. Downregulation of CDC25A was introduced in CSCC cells to explore its function in cell growth and the cell cycle progression. The potential regulators of CDC25A activity and the possible involved signaling were explored. Results CDC25A was predicted to be overexpressed in CSCC, and high expression of CDC25A was observed in CSCC cells. Downregulation of CDC25A in ME180 and C33A cells reduced cell proliferation and blocked cell cycle progression, and it increased cell apoptosis. ALX3 was a positive regulator of CDC25A through transcription promotion. It recruited a histone demethylase, lysine demethylase 2B (KDM2B), to the CDC25A promoter, which enhanced CDC25A expression through demethylation of H3k4me3. Overexpression of ALX3 in cells blocked the inhibitory effects of CDC25A silencing. CDC25A was found as a positive regulator of the PI3K/Akt signaling pathway. Conclusion This study suggested that the ALX3 increased CDC25A expression through KDM2B-mediated demethylation of H3K4me3, which induced proliferation and cell cycle progression of cervical cancer cells.

Small-molecule degraders of cyclin-dependent kinase protein: a review

2021 ◽  
Author(s):  
Bin Yu ◽  
Zekun Du ◽  
Yuming Zhang ◽  
Zhiyu Li ◽  
Jinlei Bian
Keyword(s):  
Cell Cycle ◽  
Drug Resistance ◽  
Protein Degradation ◽  
Small Molecule ◽  
Small Molecule Inhibitors ◽  
Structural Characteristics ◽  
Protein A ◽  
Cyclin Dependent Kinase ◽  
Chemical Tools ◽  
Potential Therapeutics

Proteolysis-targeting chimeras are a new modality of chemical tools and potential therapeutics involving the induction of protein degradation. Cyclin-dependent kinase (CDK) protein, which is involved in cycles and transcription cycles, participates in regulation of the cell cycle, transcription and splicing. Proteolysis-targeting chimeras targeting CDKs show several advantages over traditional CDK small-molecule inhibitors in potency, selectivity and drug resistance. In addition, the discovery of molecule glues promotes the development of CDK degraders. Herein, the authors describe the existing CDK degraders and focus on the discussion of the structural characteristics and design of these degraders.

scholarly journals APE1/Ref-1 redox-specific inhibition decreases survivin protein levels and induces cell cycle arrest in prostate cancer cells

Oncotarget ◽  
2017 ◽  
Vol 9 (13) ◽  
pp. 10962-10977 ◽  
Author(s):  
David W. McIlwain ◽  
Melissa L. Fishel ◽  
Alexander Boos ◽  
Mark R. Kelley ◽  
Travis J. Jerde
Keyword(s):  
Prostate Cancer ◽  
Cell Cycle ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Specific Inhibition ◽  
Prostate Cancer Cells ◽  
Protein Levels ◽  
Survivin Protein ◽  
Cycle Arrest
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