MCF-7 Human Breast Cancer Cells Research Articles

Cytotoxic potential and metabolomic profiling of alkaloid rich fraction of Tylophora indica leaves

Tylophora indica (Burm f.) Merrill, belong to family Asclepiadaceae, is considered to be a natural remedy with high medicinal benefits. The objective of this work is to assess the metabolomic profile of T. indica leaves enriched in alkaloids, as well as to evaluate the in vitro cytotoxicity of these leaves using the MTT assay on human breast MCF-7 and liver HepG2 cancer cell lines. Dried leaves of T. indica were extracted by sonication, using methanol containing 2 % (v/v) of acetic acid and obtained fraction was characterized by HPTLC and UPLC-MS. The UPLC-MS study yielded a preliminary identification of 32 metabolites, with tylophorine, tylophorine B, tylophorinine, and tylophorinidine being the predominant metabolites. The cytotoxicity of the extract of T. indica was evaluated on HepG2 and MCF-7 cell lines, yielding inhibitory concentration (IC50) values of 75.71 μg/mL and 69.60 μg/mL, respectively. Data suggested that the phytochemical screening clearly showed presence of numerous secondary metabolites with moderate cytotoxic efficacy. In conclusion, the future prospects of T. indica appear promising for the advancement of phytopharmaceutical-based anticancer medications, as well as for the design of contemporary pharmaceuticals in the field of cancer chemotherapy.

Molecular interactions between metformin and D-limonene inhibit proliferation and promote apoptosis in breast and liver cancer cells

BackgroundCancer is a fatal disease that severely affects humans. Designing new anticancer strategies and understanding the mechanism of action of anticancer agents is imperative.Hypothesis/PurposeIn this study, we evaluated the utility of metformin and D-limonene, alone or in combination, as potential anticancer therapeutics using the human liver and breast cancer cell lines HepG2 and MCF-7.Study designAn integrated systems pharmacology approach is presented for illustrating the molecular interactions between metformin and D-limonene.MethodsWe applied a systems-based analysis to introduce a drug–target–pathway network that clarifies different mechanisms of treatment. The combination treatment of metformin and D-limonene induced apoptosis in both cell lines compared with single drug treatments, as indicated by flow cytometric and gene expression analysis.ResultsThe mRNA expression of Bax and P53 genes were significantly upregulated while Bcl-2, iNOS, and Cox-2 were significantly downregulated in all treatment groups compared with normal cells. The percentages of late apoptotic HepG2 and MCF-7 cells were higher in all treatment groups, particularly in the combination treatment group. Calculations for the combination index (CI) revealed a synergistic effect between both drugs for HepG2 cells (CI = 0.14) and MCF-7 cells (CI = 0.22).ConclusionOur data show that metformin, D-limonene, and their combinations exerted significant antitumor effects on the cancer cell lines by inducing apoptosis and modulating the expression of apoptotic genes.

Synthesis, characterisation and in vitro anticancer activity of conjugated protease inhibitor-silver nanoparticles (AgNPs-PI) against human breast MCF-7 and prostate PC-3 cancer cell lines.

The conjugated silver nanoparticles using biomolecules have attracted great attention of researchers because physical dimensions and surface chemistry play important roles in toxicity and biocompatibility of AgNPs. Hence, in the current study, synthesis of bio-conjugated AgNPs with protein protease inhibitor (PI) isolated from Streptomyces spp. is reported. UV-visible spectra of PI and AgNPs showed stronger peaks at 280 and 405nm, confirming the synthesis of conjugated AgNPs-PI. TEM and SEM images of AgNPs-PI showed spherical-shaped nanoparticles with a slight increase in particle size and thin amorphous layer around the surface of silver nanomaterial. Circular dichroism, FT-IR and fluorescence spectral studies confirmed AgNPs-PI conjugation. Conjugated AgNPs-PI showed excellent anticancer potential than AgNPs and protease inhibitor separately on human breast MCF-7 and prostate PC-3 cell lines. The findings revealed that surface modification of AgNPs with protein protease inhibitor stabilised the nanomaterial and increased its anticancer activity.

Marine seaweed endophytic fungi-derived active metabolites promote reactive oxygen species-induced cell cycle arrest and apoptosis in human breast cancer cells.

Endophytic fungi have an abundant sources rich source of rich bioactive molecules with pivotal pharmacological properties. Several studies have found that endophytic fungi-derived bioactive secondary metabolites have antiproliferative, anti-oxidant, and anti-inflammatory properties, but the molecular mechanism by which they induce cell cycle arrest and apoptosis pathways is unknown. This study aimed to determine the molecular mechanism underlying the anticancer property of the endophytic fungi derived active secondary metabolites on human breast cancer cells. In this study, we identified four endophytic fungi from marine seaweeds and partially screened its phytochemical properties by Chromatography-Mass Spectrometry (GC-MS) analysis. Moreover, the molecular mechanism underlying the anticancer property of these active secondary metabolites (FA, FB, FC and FE) on human breast cancer cells were examined on MCF-7 cells by TT assay, Apoptotic assay by Acridine orang/Ethidium Bromide (Dual Staining), DNA Fragmentation by DAPI Staining, reactive oxygen species (ROS) determination by DCFH-DA assay, Cell cycle analysis was conducted Flow cytometry and the apoptotic signalling pathway was evaluated by westernblot analysis. Doxorubicin was used as a positive control drug for this experiment. The GC-MS analysis of ethyl acetate extract of endophytic fungi from the marine macro-algae revealed the different functional groups and bioactive secondary metabolites. From the library, we observed the FC (76%), FB (75%), FA (73%) and FE (71%) have high level of antioxidant activity which was assessed by DPPH scavenging assay. Further, we evaluated the cytotoxic potentials of these secondary metabolites on human breast cancer MCF-7 cells for 24h and the IC50 value were calculated (FA:28.62 ± 0.3µg/ml, FB:49.81 ± 2.5µg/ml, FC:139.42 ± µg/ml and FE:22.47 ± 0.5µg/ul) along with positive control Doxorubicin 15.64 ± 0.8µg/ml respectively by MTT assay. The molecular mechanism by which the four active compound induced apoptosis via reactive oxygen species (ROS) and cell cycle arrest in MCF-7 cells was determined H2DCFDA staining, DAPI staining, Acridine orange and ethidium bromide (AO/EtBr) dual staining, flowcytometry analysis with PI staining and apoptotic key regulatory proteins expression levels measured by westernblot analysis. Our findings, revealed the anticancer potential of endophytic fungi from marine seaweed as a valuable source of bioactive compounds with anticancer properties and underscore the significance of exploring marine-derived endophytic fungi as a promising avenue for the development of novel anticancer agents. Further investigations are necessary to isolate and characterize specific bioactive compounds responsible for these effects and to validate their therapeutic potential in preclinical and clinical settings.

Preparation and characterization of co-loaded indocyanine green and elemene nano-emulsion in situ gel and its effect on proliferation of breast cancer MCF-7 cells

This study aims to prepare co-loaded indocyanine green(ICG) and elemene(ELE) nano-emulsion(NE) in situ gel(ICG-ELE-NE-gel) and evaluate its physicochemical properties and antitumor activity in vitro. ICG-ELE-NE-gel was prepared by aqueous phase titration and cold solution methods, followed by characterization of the morphology, particle size, corrosion, and photothermal conversion characteristics. The human breast cancer MCF-7 cells were taken as the model, combined with 808 nm laser irradia-tion. Cell inhibition rate test and cell uptake test were performed. ICG-ELE-NE was spherical and uniform in size. The average particle size and Zeta potential were(85.61±0.35) nm and(-21.4±0.6) mV, respectively. The encapsulation efficiency and drug loading rate were 98.51%±0.39% and 10.96%±0.24%, respectively. ICG-ELE-NE-gel had a good photothermal conversion effect and good photothermal stability. The dissolution of ICG-ELE-NE-gel had both temperature and pH-responsive characteristics. Compared with free ELE, ICG-ELE-NE-gel combined with near-infrared light irradiation significantly enhanced the inhibitory effect on MCF-7 cells and could be uptaken in large amounts by MCF-7 cells. ICG-ELE-NE-gel was successfully prepared, and its antitumor activity was enhanced after 808 nm laser irradiation.

Synthesis and computational study of metal complex of α-mangostin as an anticancer candidate

Context: The number of breast cancer patients from year to year is increasing, accompanied by an increase in global mortality; the position in Indonesia has reached 60-70% with end-stage conditions. ERα antiproliferative activity exists in α-mangostin compounds, but this compound still has several physicochemical problems, including its solubility. Therefore, efforts are needed to increase the activity of α-mangostin and its affinity as an alpha estrogen receptor antagonist through a structure-based design method. Aims: To obtain new compounds derived from α-mangostin in the form of a metal complex with cobalt (AM-Co), platinum (AM-Pt), and iron (AM-Fe) as medicinal ingredients that can be used as breast cancer therapeutic agents. Methods: The research methods include in silico studies (pharmacokinetic and toxicity prediction, molecular docking, and molecular dynamics), semi-synthesis to form a complex compound, and testing cytotoxic activity against MCF-7 and T-47D human breast cancer cells. Results: From the in vitro test results, it can be seen that the AM-Pt compound showed the best anticancer activity on MCF-7 cells compared to others from IC50 and SI values; this was supported by the results of in silico studies either through molecular docking or molecular dynamics, where this compound was more effective. Conclusions: Furthermore, it can be used as an anticancer candidate; particularly, its activity is predicted to be more potent as an ER antagonist than -mangostin and cisplatin.

Detection of Anti-cancer Activity of Silver Nanoparticles Synthesized using Aqueous Mushroom Extract of Pleurotus ostreatus on MCF-7 Human Breast Cancer Cell Line

In this research, silver nanoparticles (AgNPs) were manufactured using aqueous extract of mushroom Pleurotus ostreatus. Anticancer potential of AgNPs was investigated versus human breast cancer cell line (MCF-7). Cytotoxic response was assessed by MTT assay. AgNPs showed inhibition effect at the following concentrations 12.5, 25, 50, 100 and 200 µg/ml versus MCF-7 cell line, and all treatments had a positive result. The MCF-7 cells were inhibited up to 85.14 % at the concentration 200 μg/ml of AgNPs which reduced cells viability to 14.86%, while 12.5 μg/ml of AgNPs caused 24.23% cells inhibition with reduction of cells viability to 75.77%.

Activation of the Anaphase Promoting Complex Restores Impaired Mitotic Progression and Chemosensitivity in Multiple Drug-Resistant Human Breast Cancer.

The development of multiple-drug-resistant (MDR) cancer all too often signals the need for toxic alternative therapy or palliative care. Our recent in vivo and in vitro studies using canine MDR lymphoma cancer cells demonstrate that the Anaphase Promoting Complex (APC) is impaired in MDR cells compared to normal canine control and drug-sensitive cancer cells. Here, we sought to establish whether this phenomena is a generalizable mechanism independent of species, malignancy type, or chemotherapy regime. To test the association of blunted APC activity with MDR cancer behavior, we used matched parental and MDR MCF7 human breast cancer cells, and a patient-derived xenograft (PDX) model of human triple-negative breast cancer. We show that APC activating mechanisms, such as APC subunit 1 (APC1) phosphorylation and CDC27/CDC20 protein associations, are reduced in MCF7 MDR cells when compared to chemo-sensitive matched cell lines. Consistent with impaired APC function in MDR cells, APC substrate proteins failed to be effectively degraded. Similar to our previous observations in canine MDR lymphoma cells, chemical activation of the APC using Mad2 Inhibitor-1 (M2I-1) in MCF7 MDR cells enhanced APC substrate degradation and resensitized MDR cells in vitro to the cytotoxic effects of the alkylating chemotherapeutic agent, doxorubicin (DOX). Using cell cycle arrest/release experiments, we show that mitosis is delayed in MDR cells with elevated substrate levels. When pretreated with M2I-1, MDR cells progress through mitosis at a faster rate that coincides with reduced levels of APC substrates. In our PDX model, mice growing a clinically MDR human triple-negative breast cancer tumor show significantly reduced tumor growth when treated with M2I-1, with evidence of increased DNA damage and apoptosis. Thus, our results strongly support the hypothesis that APC impairment is a driver of aggressive tumor development and that targeting the APC for activation has the potential for meaningful clinical benefits in treating recurrent cases of MDR malignancy.

Evaluating The Cytotoxic Activity of Lactobacillus plantarum IIA-1A5 Against MCF-7 Human Breast Cancer Cells and Identifying Its Surface Layer Protein Gene

Breast cancer is a serious global health concern, with a high mortality rate worldwide. Using natural compounds as potential cancer therapies is a promising approach to address this issue. Previous research has shown that probiotic lactic acid bacteria (LAB) and their metabolites, such as surface layer protein (slp), have a positive impact on a variety of health disorders, including cancer. The purpose of this study was to evaluate the ability of Lactobacillus plantarum IIA-1A5 to suppress the growth of the MCF-7 breast cancer cell line and detect the presence of the slp gene. Intracellular and extracellular protein fractions were isolated from L. plantarum IIA-1A5 cultures. The protein concentrations and molecular weights of the extracts were measured. The anticancer activity of the extracts was assessed using the MTT cytotoxicity test, and IC50 values were calculated. The slp gene was identified through polymerase chain reaction (PCR) amplification and nucleotide sequencing. The results demonstrated that L. plantarum IIA-1A5 had a concentration-dependent inhibitory effect on MCF-7 breast cancer cells, with IC50 values of 6.831 and 12.35 μg/mL for intracellular extracts and extracellular extracts, respectively. Additionally, PCR amplification and nucleotide sequencing confirmed the presence of the slp gene, which may contribute to the strain’s anticancer abilities. These findings suggest the potential of L. plantarum IIA-1A5 as a natural anticancer agent against MCF-7 breast cancer cells. Further research is warranted to elucidate the underlying mechanisms of L. plantarum IIA-1A5 in breast cancer treatment.

Antibacterial activity, cytotoxicity and chemotaxonomic significance of chemical constituents from Alsophila manniana Hook R.M.Tryon (Cyatheaceae) rhizomes

Phytochemical investigation of Alsophila manniana rhizomes led to the isolation of twelve known compounds, including two triterpenes (1 and 2), four steroids (3–6), one glycerol (7), three phenols (8–10), and two flavonoids (11 and 12). Their structures were elucidated by analyses of the NMR and MS data and by comparisons with those in the literature. Their antibacterial and cytotoxic activities were evaluated against Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, and Bacillus subtilis; and on human lung A549, cervical HeLa, and breast MCF-7 cancer cell lines, respectively. Fractions FD and FF had significant activities against E. coli (MIC = 75 μg/mL) and K. pneumoniae (MICs = 75 and 37.5 μg/mL). Compounds 3 and 7–12 had moderate antibacterial activities with MIC values ranging from 75 to 150 μg/mL against the bacteria. All samples were inactive against all tested human cancer cell lines, even at 100 μg/mL. This is the first investigation of the chemical constituents of A. manniana, as well as the first report of compounds 3, 7, and 10–12 from the genus Alsophila. The chemotaxonomic significance of these compounds is discussed.

Aurora B kinase inhibition intensifies cisplatin cytotoxicity in MCF7 breast cancer cells

Aim: Cancer, a complex and multifaceted group of diseases, poses a formidable challenge to global health. Characterised by uncontrolled cell growth and proliferation, it manifests in diverse forms, each with unique biological traits. Understanding the complexity of cancer biology is essential for developing targeted therapeutic interventions. This research aimed to explore the impact of inhibiting Aurora B kinase with BI 831266 on the anticancer efficacy of cisplatin in MCF7 cells, contributing to our understanding of potential treatment strategies. Materials and Methods: Good Cell Culture Practices were conducted in this research, where MCF7 human breast cancer cells were used in order to assess the therapeutic potential of the BI 831266 and cisplatin combination. Regarding functional experiments, we employed in vitro cell proliferation assay, 2D clonogenic survival assay, 3D colony formation assay and wound-healing assay. To elucidate the molecular mechanism underlying the observed functional outcomes, SDS-PAGE and Western blotting experiments were additionally conducted. Results: Our findings uncovered a synergistic interaction between inhibiting Aurora B kinase and treating MCF7 cancer cells with cisplatin. The combined treatment significantly increased cisplatin's cytotoxicity, hindered cancer cell migration, and influenced apoptotic pathways, as evident from changes in key protein expressions. Conclusion: Our research emphasises the significance of targeting Aurora B kinase in order to enhance therapeutic responses of cisplatin in MCF7 breast cancer cells. The study contributes valuable insights into potential combination therapies, offering a more effective and targeted approach for treating breast cancer.

Assessment of the cytotoxic effect of carboxymethyl chitosan-loaded amygdalin nanoparticles against human normal and cancer cell lines

In recent years, the development of antitumor drugs has been dedicated to natural products. Amygdalin is a natural herbal cyanoglycoside that has anticarcinogenic effect on many types of cancers once hydrogen cyanide (HCN) is released. The main objective of the present study is to synthesize and investigate the potential of carboxymethyl chitosan nanoparticles (CMC NPs) as drug delivery agents for amygdalin encapsulation and its delivery to cancer and normal cell lines. In this study, carboxymethyl chitosan nanoparticles encapsulated with amygdalin (CMC-Am NPs) were prepared and characterized through their particle size, surface charge, chemical structure and dielectric properties. Also, the invitro drug release of amygdalin from CMC NPs was studied. Additionally, the cytotoxcity of the amygdalin and CMC-loaded amygdalin NPs were evaluated through MTT assay. The results showed that the prepared CMC-loaded amygdalin NPs exhibited a small particle size of 129 nm, high zeta potential value of − 43 mV and confirmed the amygdalin stability and compatibility with CMC NPs. Furthermore, the CMC NPs demonstrated sustained release of amygdalin during 24 h. Moreover, compared to free amygdalin, amygdalin-loaded CMC NPs have significant anti-cancerous effect on human colon HCT-116 and breast MCF-7 cancer cell lines while being safe on normal cells BJ1. In conclusion, CMC NPs can be employed as an efficient drug delivery vehicle for controlled and sustained amygdalin release with enhanced cytotoxicity on malignant cells without harming normal cells.

Ginsenoside Re Suppress the Proliferation and Migration of MCF-7 Human Breast Cancer Cells

Ginsenoside Re Suppress the Proliferation and Migration of MCF-7 Human Breast Cancer Cells

Sutherlandiosides E−K: Further cycloartane glycosides from Sutherlandia frutescens

A further chemical investigation of the butanol extract of leaves from the South African medicinal plant Sutherlandia frutescens led to the isolation of eight previously unreported saponins (1−8), together with the known sutherlandiosides A−D. Their structures were established by spectroscopic (1D and 2D NMR) analyses, CD, optical rotation, mass spectrometry, as well as chemical conversions. The isolates were screened for their cytotoxic activity against the MCF-7 human breast cancer cell line, although no significant activity was observed. In addition to the chemophenetic markers for this genus, i.e. the cycloartane glycosides, the present work also reports on the first isolation of an oleanan-type saponin from the Sutherlandia genus, forming an important fingerprint for the chemical composition of the plant.

Enhanced prokaryotic expression, purification, and biological activities of human keratinocyte growth factor

Keratinocyte growth factor (KGF), also known as fibroblast growth factor 7 (FGF7), plays a critical role in embryonic development, cell proliferation, and differentiation. However, efficient production of recombinant KGF remains a challenge due to its low expression levels and high tendency for aggregation in Escherichia coli. This study aimed to enhance the expression and solubility of KGF by employing different protein tags—PDIb'a', MBP, and His—fused to the N-terminus of KGF. Among these, H-PDIb'a'-KGF demonstrated superior stability and was selected for large-scale production and purification. The purified KGF was confirmed through liquid chromatography with tandem mass spectrometry analysis, which showed an 81% fragment mass identification coverage. Biological activity assessments using human breast cancer MCF-7 cells indicated that purified KGF significantly increased cell proliferation, with an EC50 of 6.4 ± 0.5 pM. Interestingly, PDIb'a' alone also exhibited a stimulatory effect on MCF-7 cells. Furthermore, the purified KGF enhanced the wound healing of HaCaT keratinocytes in a dose-dependent manner. These findings provide valuable insights into the efficient production and functional characterization of recombinant KGF for potential applications in therapeutic interventions.

Validation of Human Bone Marrow-derived Mesenchymal Stem Cells and MCF-7 Breast Cancer Cells Co-culture Using a 3D Perfused Biomimetic Microfluidic Platform.

Microfluidic experimental models allow to study the mutual interrelation between tumor development and the microvasculature avoiding animal use and lacking interspecies differences. This study aimed to develop and characterize a 3D tissue culture model employing a two-compartment microfluidic chip-perfused platform to visualize and quantify human bone marrow-derived mesenchymal stem cells (hBM-MSCs) and MCF-7 breast cancer cell-cell interactions in real time. MCF-7 cells were implanted in the tumor chamber and hBM-MSCs were injected into microvascular channels. hBM-MSCs culture media was perfused into microvascular compartments. The microfluidic device was microscopically examined weekly for four weeks. VE- and E-cadherin immunofluorescence validated hBM-MSCs differentiation into endothelial cells and MCF-7 cell tumor formation. hBM-MSCs differentiation was highly heterogeneous along the microvascular channels, due to different perfusion flow. hBM-MSCs lining microvascular channels acquired VE-cadherin positive endothelial phenotype and continuously covered microchannels as an endothelium like layer. MCF-7 cells were constantly grown as spheroidal aggregates and later formed a compact area of E-cadherin-positive tumor cells inside tumor compartment. Our study provides valuable knowledge on the properties of hBM-MSCs as vasculogenesis-supporting cells when co-cultured with MCF-7 cells on a 3D perfused biomimetic microfluidic device. This newly established model may serve as an experimental platform for testing anti-tumor/anti-angiogenic drugs.

A pyridyl-benzimidazole based ruthenium(II) complex as optical sensor: Targeted cyanide detection and live cell imaging applications

An extreme toxicity of cyanide (CN−) ion in diverse environmental media has encouraged significant attention for scheming well-organised molecular probes for its selective and sensitive detection. Keeping in mind, we present here a monometallic Ru(II) complex (Ru-1) based on 2-(pyridin-2-yl)-1H-benzo[d]imidazole moiety acting as a highly selective luminescent probe for CN− recognition in pure water. Besides, Ru-1 also acted as an efficient sensor for F−, AcO− and H2PO4− ions along with CN− when acetonitrile was chosen as solvent system. The binding constant (Kb) and detection limit (LoD) for CN− have been depicted as 3.05 × 106 M−1 and 12.8 nM, respectively, in water. The close proximity of N-H site with Ru(II) centre along with its remarkable acidity were identified as mainly responsible for the high selectivity of Ru-1 toward CN− in water. Job’s plot and DFT analyses were carried out to support the anion binding mechanism. Furthermore, the time-resolved fluorescence (TRF) spectroscopy was performed to assess the cyanide-induced emission lifetime change of Ru-1 in aqueous medium. In order to investigate applied potential, the probe Ru-1 was notably developed into paper-based strips that could readily detect CN− ion in mM range via naked eye under 365 nm light illumination, and also adequately employed to detect CN− in human breast cancer MCF-7 cell lines and natural food sources (such as apple seeds and sprouting potatoes).

Abstract 261: Akt1 and Cyclin D1 govern polarity of self-renewing divisions in breast cancer stem cells

Abstract Background. Stem-like cells contribute to the development and progression of human cancers. Genes that control symmetric cell divisions have an evolutionarily conserved role in the regulation of cell polarity and in tumorigenesis. Two cells generated by asymmetric divisions have reduced proliferative potential compared with symmetric divisions. The cell survival oncoprotein Akt (Protein Kinase B) is encoded by three isoforms that are altered in human cancers. The Akt isoform-specific impact on breast cancer stem cell function and polarity is controversial, with Akt1 either reducing (1) or promoting (2) cell polarity and migration in tissue culture. Deletion of Akt1 reduced mammary tumor progression and metastasis in transgenic mice (2,3). Methods. Analysis of Akt1, cyclin D1 and Notch signaling was conducted from public databases, and human as well as murine breast cancer samples. Cells derived from Akt1 gene deletion MMTV-ErbB2 breast oncomice (MMTV-ErbB2/Akt1+/+ and MMTV-ErbB2/Akt1−/−) and from the human MCF-7 breast cancer cell line with regulated expression of cyclin D1 and p53 were analyzed for the symmetry of cell division, stem cell function, and signaling pathways. Results. In breast tumors derived from MMTV-ErbB2 transgenics, associated with reduced metastasis, Akt1 genetic deletion reduced the frequency of symmetric cell divisions and the production of mammospheres. Akt1 deletion increased p53 and reduced cyclin D1. Pharmacological reactivation of p53 with Nutlin correlated with the reinduction of asymmetric cellular divisions and reduction in mammospheres in murine and human BCa cells. Akt1 deletion abrogated Nutlin-mediated induction of asymmetric cell divisions. Cyclin D1 induced symmetrical cell divisions, mammosphere formation and reduced p53 and Numb. Conclusions. Akt1 promoted symmetrical cell division at least in part via cyclin D1 suppression of Numb, and induction of γ secretase activity and thereby Notch signaling. Reference. (1) Irie HY, Pearline RV, Grueneberg D, Hsia M, Ravichandran P, Kothari N, et al. Distinct roles of Akt1 and Akt2 in regulating cell migration and epithelial-mesenchymal transition. J Cell Biol 2005;171:1023-34. (2) Ju X, Katiyar S, Wang C, Liu M, Jiao X, Li S, et al. Akt1 governs breast cancer progression in vivo. Proc Natl Acad Sci U S A 2007;104:7438-43. (3) Chen X, Ariss MM, Ramakrishnan G, Nogueira V, Blaha C, Putzbach W, et al. Cell-Autonomous versus Systemic Akt Isoform Deletions Uncovered New Roles for Akt1 and Akt2 in Breast Cancer. Mol Cell 2020;80:87-101 e5 Citation Format: Xuanmao Jiao, Xin Sun, Zhiping Li, Xiaoming Ju, Danni Li, Ritika Harish, Gordon Robertson, Anthony W. Ashton, Richard G. Pestell. Akt1 and Cyclin D1 govern polarity of self-renewing divisions in breast cancer stem cells [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 261.

Abstract 4149: Real-time intravital trafficking of tumor infiltrating lymphocytes in breast cancer models

Abstract Cancer immunotherapy utilizing the immunoreactive efficiency of immune cells via adoptive cell therapy (ACT) has been a novel method of cancer treatment. In tumor microenvironment, immune cell reactivity of tumor-infiltrating lymphocytes (TILs) can facilitate cancer cell attack, which finally derives efficient suppression of tumor growth. However, the conventional evaluation for cancer immunotherapy has been generally performed by ex vivo methods, providing restricted information on lymphocyte motility and immune cell dynamics within the tumor microenvironment. In vivo data with the dynamic behavior of TILs in breast cancer can provide new insight to investigate novel targets of immune checkpoint inhibitors. In this research, longitudinal intravital imaging of motility trafficking of TILs in breast cancer animal models has been performed by utilizing intravital microscopy to unveil the immunoreactive dynamics of T cell activity in early stage. In vivo analysis of TIL motility within different breast cell lines, including 4T1 (mouse breast cancer cell), MDA-MB-231 (human triple-negative breast cancer cell), and MCF7 (human breast cancer cell), respectively, has been investigated for immune responses to cancer. We’ve monitored spatiotemporal dynamics of TIL over 11 days in breast cancer xenograft mouse model generated by tumor implantation into the dorsal skinfold imaging chamber and adoptive T cell transfer by blood circulation. In the results, the adoptive immunoreactivity of TIL has been differentiated by the timepoint of adoptive T cell transfer, distance proximity of T cells in tumors, and breast cancer types. Furthermore, anti-cancer effect coordinated with dendritic cells behaviors showed induced immune responses with accumulated dendritic cells with increased TIL count over time in breast cancer model treated with various cancer therapy such as immunotherapy, radiation therapy and anti-cancer drug (anti-PD-L1), which implied a relationship between programmed death-ligand 1 expression levels and TIL/dendritic cell motility. The result demonstrates that intravital TIL motility trafficking analysis in cancer model can be an invaluable assessment method to explain the detailed cellular/molecular mechanism of immune response to cancer involved with T lymphocytes, dendritic cells, and immune checkpoint inhibitors to accelerate the efficiency of cancer immunotherapy. Citation Format: Soyeon Ahn, Kubra Akyildiz, Hyunseok Kim, Pilhan Kim. Real-time intravital trafficking of tumor infiltrating lymphocytes in breast cancer models [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 4149.

Evaluation of Efficacy of Curcumin and Caffeic Acid Phenethyl Ester in Breast Cancer by Preclinical Studies.

CAPE and curcumin are a class of phenolics. While curcumin is obtained from turmeric, CAPE is found in Baccharis sarothroides and Populus deltoides. Both agents are reported to produce activities in some cancer types. The combined and comparative effects of the two agents in breast cancer have not yet reported. We evaluated the potential of CAPE and curcumin in both in vitro and in vivo breast cancer models. Human breast cancer cell lines, MDA-MB-231 and MCF-7, were exposed to CAPE and curcumin, followed by functional assays such as cell cytotoxicity, cell proliferation and colony formation, cell cycle, mitochondrial membrane potential, apoptosis, and monodansylcadaverine (MDC) staining for autophagy. Computational analyses and mouse models were also used. Employing computational analyses, both agents were found to exhibit drug-like properties. Both molecules interacted with the key molecules of the NF-κB pathway. CAPE and curcumin inhibited cell proliferation, colony formation, and invasion, triggering apoptosis in breast cancer cells. CAPE was found to be more effective than curcumin. Two agents working together were more effective than each agent working alone. Both agents suppressed the expression of survivin, Bcl-xL and GLUT-1. The level of cleaved PARP was increased by both agents. Both phenolics observed an induction in ROS generation. Further, both molecules triggered a dissipation in mitochondrial membrane potential. In mice models implanted with Ehrlich-Lettre ascites carcinoma (EAC) cells, both drugs inhibited the growth of the tumour. The phenolics also modulated the metabolic parameters in tumour-bearing mice. The observations suggest that the combination of curcumin plus CAPE may be better in comparison to individual molecules. Other: The study opens a window for analysing the efficacy of the combination of CAPE and curcumin in animal studies. This will provide a basis for examining the combined efficacy of two agents in a clinical trial.