Novel cyanochalcones as potential anticancer agents: apoptosis, cell cycle arrest, DNA binding, and molecular docking studies.

In the light of anticancer drug discovery and development, a new series of cyanochalcones incorporating indole moiety (5a-g) were efficiently synthesized and characterized by different spectral analysis. MTT assay was used to evaluate the antiproliferative activity of the synthesized compounds towards different cancer cells (Hela, MDA-MB-231, A375, and A549) in parallel with normal cells (HSF). Trimethoxy and diethoxy-containing derivatives (5d and 5e) displayed the most selective cytotoxic activities against cervical Hela cells with IC50 values of 8.29 and 11.82 µM, respectively, with great safety pattern toward normal HSF cells (Selectivity index: 21.3 and 13.9, respectively). Therefore, 5d and 5e were chosen to study their effects on apoptosis, cell cycle arrest, and migration of Hela cells using flow cytometric analysis and wound healing assay. They induced apoptosis and cell cycle arrest at the S phase and impaired migration of HeLa cells. Regarding their effects on the expression profile of crucial genes related to the potential anticancer activities, 5d and 5e remarkably upregulated caspase 3 and Beclin1 and downregulated cyclin A1, CDK2, CDH2, MMP9, and HIF1A using qRT-PCR and ELISA techniques. UV-Vis spectral measurement demonstrated the ability of 5d and 5e to bind CT-DNA efficiently with Kb values of 3.7 × 105 and 1 × 105 M-1, respectively. Moreover, in silico molecular docking was performed to assess the binding affinities of the compounds toward the active sites of Bcl2, CDK2, and DNA. Therefore, cyanochalcones 5d and 5e might be promising anticancer agents and could offer a scientific basis for intensive research into cancer chemotherapy.Communicated by Ramaswamy H. Sarma.

A novel series of cyanochalcones incorporating indole moiety (5a­g) were designed and synthesized.Cytotoxic activities of the designed compounds were evaluated in vitro against different human cancer cell lines (Hela, MDA-MB-231, A375, and A549) in parallel with human normal cells (HSF).5d and 5e stimulated apoptosis (through deregulating Bcl2 and upregulating Cas3), cell cycle arrest at the S phase (by suppressing cyclin A and CDK2), and inhibited migration (through downregulating CDH2 and MMP9) of Hela cells.5d and 5e demonstrated good DNA binding affinities.Molecular docking was carried out to confirm the binding abilities of 5d and 5e toward Bcl2, CDK2, and DNA.

Therapeutic potential of stem cells and acitretin on inflammatory signaling pathway-associated genes regulated by miRNAs 146a and 155 in AD-like rats.

Alzheimer's disease (AD) is one of the most common causes of dementia. Several drugs are used to improve the symptoms, but do not stop AD progression. There are more promising treatments that may have a significant role in AD diagnosis and treatment such as miRNAs and stem cells. The present study aims to develop a new approach for AD treatment by mesenchymal stem cells (MSCs) and/or acitretin with special reference to inflammatory signaling pathway as NF-kB and its regulator miRNAs in AD-like rat model. Fourty-five male albino rats were allotted for the present study. The experimental periods were divided into induction, withdrawal, and therapeutic phases. Expression levels of miR-146a, miR-155, necrotic, growth and inflammatory genes were assessed using RT-qPCR. Histopathological examination of brain tissues was performed in different rat groups. The normal physiological, molecular, and histopathological levels were restored after treatment with MSCs and/or acitretin. The present study demonstrates that the miR-146a and miR-155 might be used as promising biomarkers for AD. MSCs and/or acitretin proved their therapeutic potential in restoring the expression levels of targeted miRNAs and their related genes concerning NF-kB signaling pathway.

miRNAs and Stem Cells as Promising Diagnostic and Therapeutic Targets for Alzheimer's Disease.

Alzheimer's disease (AD) is a cumulative progressive neurodegenerative disease characterized mainly by impairment in cognitive functions accompanied by memory loss, disturbance in behavior and personality, and difficulties in learning. Although the main causes of AD pathogenesis are not fully understood yet, amyloid-ß peptides and tau proteins are supposed to be responsible for AD onset and pathogenesis. Various demographic, genetic, and environmental risk factors are involved in AD onset and pathogenesis such as age, gender, several genes, lipids, malnutrition, and poor diet. Significant changes were observed in microRNA (miRNA) levels between normal and AD cases giving hope for a diagnostic procedure for AD through a simple blood test. As yet, only two classes of AD therapeutic drugs are approved by FDA. They are classified as acetylcholinesterase inhibitors and N-methyl-D-aspartate antagonists (NMDA). Unfortunately, they can only treat the symptoms but cannot cure AD or stop its progression. New therapeutic approaches were developed for AD treatment including acitretin due to its ability to cross blood-brain barrier in the brain of rats and mice and induce the expression of ADAM 10 gene, the α-secretase of human amyloid-ß protein precursor, stimulating the non-amyloidogenic pathway for amyloid-ß protein precursor processing resulting in amyloid-ß reduction. Also stem cells may have a crucial role in AD treatment as they can improve cognitive functions and memory in AD rats through regeneration of damaged neurons. This review spotlights on promising diagnostic techniques such as miRNAs and therapeutic approaches such as acitretin and/or stem cells keeping in consideration AD pathogenesis, stages, symptoms, and risk factors.

Regulatory Effect of Adipose-Derived Mesenchymal Stem Cells and/ or Acitretin on Adam10 Gene in Alzheimer's Disease Rat Model.

BACKGROUND: Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by progressive cognitive deterioration. All recent therapeutic strategies tend to inhibit the generation of the Aß peptide. These approaches tend to mediate both α - and γ -secretases to undergo the nonamyloidogenic pathway. ADAM10 is the main α-secretase that cleaves APP, and it is regulated by the metabolic product of vitamin A (retinoic acid), which is being widely used recently in AD research as a target for treatment. Mesenchymal stem cells (MSCs) are also used recently as a promising regenerative therapy for AD. OBJECTIVES: The present study aimed to: (1) study the effect of MSCs with/without acitretin on the regulation of Adam10 gene expression in AlCl3-induced AD rat model, and (2) validate the hypothesis that AD is a time-dependent progressive disease that spreads spontaneously even after the stopping of exposure to AlCl3. METHODS: The experimental work has been designed to include three successive phases; AlCl3 induction phase (I), AlCl3 withdrawal phase (W), and therapeutic phase (T). Forty-five male albino Wistar rats were randomly divided into 2 main groups: the control (C) group (15 rats) and AD group (30 rats). The therapeutic potential of MSCs with/without acitretin has been evaluated at behavioral, physiological, molecular, and histopathological levels. RESULTS: Among the three therapeutic groups, combined administration of both MSC and acitretin showed the best compensatory effects on most of the measured parameters. CONCLUSION: The present study approved that AD is a time-dependent progressive disease which spreads spontaneously without more AlCl3 exposure.

Bee venom and its active component Melittin synergistically potentiate the anticancer effect of Sorafenib against HepG2 cells.

There are current attempts to find a safe substitute or adjuvant for Sorafenib (Sorf), the standard treatment for advanced hepatocellular carcinoma (HCC), as it triggers very harsh side effects and drug-resistance. The therapeutic properties of Bee Venom (BV) and its active component, Melittin (Mel), make them suitable candidates as potential anti-cancer agents per-se or as adjuvants for cancer chemotherapy. Hence, this study aimed to evaluate the combining effect of BV and Mel with Sorf on HepG2 cells and to investigate their molecular mechanisms of action. Docking between Mel and different tumor-markers was performed. The cytotoxicity of BV, Mel and Sorf on HepG2 and THLE-2 cells was conducted. Combinations of BV/Sorf and Mel/Sorf were performed in non-constant ratios on HepG2. Expression of major cancer-related genes and oxidative stress status was evaluated and the cell cycle was analyzed. The computational analysis showed that Mel can bind to and inhibit XIAP, Bcl2, MDM2, CDK2 and MMP12. Single treatments of BV, Mel and Sorf on HepG2 showed lower IC50than on THLE-2. All combinations revealed a synergistic effect at a combination index (CI) < 1. Significant upregulation (p < 0.05) of p53, Bax, Cas3, Cas7 and PTEN and significant downregulation (p < 0.05) of Bcl-2, Cyclin-D1, Rac1, Nf-κB, HIF-1a, VEGF and MMP9 were observed. The oxidative stress markers including MDA, SOD, CAT and GPx showed insignificant changes, while the cell cycle was arrested at G2/M phase. In conclusion, BV and Mel have a synergistic anticancer effect with Sorf on HepG2 that may represent a new enhancing strategy for HCC treatment.

MicroRNA-520c-3p Modulates Doxorubicin-Chemosensitivity in HepG2 Cells.

BACKGROUND: Doxorubicin (DOX) is one of the most common drugs used in cancer therapy, including Hepatocellular Carcinoma (HCC). Drug resistance is one of chemotherapy's significant problems. Emerging studies have shown that microRNAs (miRNAs) could participate in regulating this mechanism. Nevertheless, the impact of miRNAs on HCC chemoresistance is still enigmatic. OBJECTIVE: Investigating the role of microRNA-520c-3p (miR-520c-3p) in the enhancement of the anti-tumor effect of DOX against HepG2 cells. METHODS: Expression profile for liver-related miRNAs (384 miRNAs) has been analyzed on HepG2 cells treated with DOX using qRT-PCR. miR-520c-3p, the most deregulated miRNA, was selected for combination treatment with DOX. The expression level for LEF1, CDK2, CDH1, VIM, Mcl-1 and p53 was evaluated in miR-520c-3p transfected cells. Cell viability, colony formation, wound healing as well as apoptosis assays have been demonstrated. Furthermore, Mcl-1 protein level was measured using the western blot technique. RESULTS: The present data indicated that miR-520c-3p overexpression could render HepG2 cells chemo-sensitive to DOX through enhancing its suppressive effects on proliferation, migration, and induction of apoptosis. The suppressive effect of miR-520c-3p involved altering the expression levels of some key regulators of cell cycle, proliferation, migration and apoptosis, including LEF1, CDK2, CDH1, VIM, Mcl-1 and p53. Interestingly, Mcl-1 was found to be one of the potential targets of miR-520c-3p, and its protein expression level was down-regulated upon miR-520c-3p overexpression. CONCLUSION: Our data referred to the tumor suppressor function of miR-520c-3p that could modulate the chemosensitivity of HepG2 cells towards DOX treatment, providing a promising therapeutic strategy in HCC.

MicroRNA-372-3p Predicts Response of TACE Patients Treated with Doxorubicin and Enhances Chemosensitivity in Hepatocellular Carcinoma.

BACKGROUND: Identification of factors to detect and improve chemotherapy.response in cancer is the main concern. microRNA-372-3p (miR-372-3p) has been demonstrated to play a crucial role in cellular proliferation, apoptosis and metastasis of various cancers including Hepatocellular Carcinoma (HCC). However, its contribution towards Doxorubicin (Dox) chemosensitivity in HCC has never been studied. OBJECTIVE: This study aims to investigate the potential role of miR-372-3p in enhancing Dox effects on HCC cell line (HepG2). Additionally, the correlation between miR-372-3p and HCC patients who received Transarterial Chemoembolization (TACE) with Dox treatment has been analyzed. METHODS: Different cell processes were elucidated by cell viability, colony formation, apoptosis and wound healing assays after miR-372-3p transfection in HepG2 cells Furthermore, the miR-372-3p level has been estimated in the blood of primary HCC patients treated with TACE/Dox by quantitative real-time PCR assay. Receiver Operating Curve (ROC) analysis for serum miR-372-3p was constructed for its prognostic significance. Finally, the protein level of Mcl-1, the anti-apoptotic player, has been evaluated using western blot. RESULTS: We found a significantly higher level of miR-372-3p in the blood of the responder group of HCC patients who received TACE with Dox than of non-responders. Ectopic expression of miR-372-3p reduced cell proliferation, migration and significantly induced apoptosis in HepG2 cells which was coupled with a decrease of anti-apoptotic protein Mcl-1. CONCLUSION: Our study demonstrated that miR-372-3p acts as a tumor suppressor in HCC and can act as a predictor biomarker for drug response. Furthermore, the data referred for the first time its potential role in drug sensitivity that might be a therapeutic target for HCC.

Biological Activity, Apoptotic Induction and Cell Cycle Arrest of New Hydrazonoyl Halides Derivatives.

BACKGROUND: The hydrazonoyl halides are presently an important target in the field of medicinal chemistry. The interest in the chemistry of hydrazonoyl halides is a consequence of the fact that they undergo a wide variety of reactions which provide routes to a myriad of both heterocyclic and acyclic compounds. In addition, they have diverse biological activities such as antiviral, anthelmintic, antiarthropodal, fungicidal, herbicidal, insecticidal, pesticidal, acaricidal and miticidal Activity correlated to the presence of hydrazonoyl halides. Moreover, many applications in both industrial and pharmaceutical fields have been found to be associated with these halides. Depending on the above facts and continuation to our work, we herein report on the evaluation of the anticancer activity of these two halides prepared according to the published work and trying to know their molecular mechanism that they proceed to stop proliferation and metastasis of tumor cells by molecular tools such as real time PCR using different apoptotic genes, and cell cycle assay. OBJECTIVE: The goal of this present study is to bring attention to the biological activities of hydrazonoyl halides and the molecular pathway they follow to exert their role in apoptotic death of cancer cell. METHODS: Synthesis of hydrazonoyl halides 2c and 2f. The cytotoxic effect against different human cancer cell lines PC3, HepG-2, HCT-116, MCF-7 and also on normal human cell lines as MCF-10 and MCF-12 in a monolayer culture model was evaluated. Their mechanism of action inside cancer cell was evaluated using different molecular tools. CONCLUSION: Strong and promising chemotherapeutic hydrazonoyl halides (2a-2f) were evaluated for their different biological activities. As antimicrobial agents, results indicated that three compounds 2a, 2e and 2f exhibited high activity against two tested gram positive bacteria Staphylococcus aureus, Bacillus subtilis, and gram negative ones Escherichia coli, and Pseudomonas aeruginosa, the rest of the compounds were found to be moderately active against the tested microorganisms. Regarding their antifungal effect, compound 2c exhibited potent and promising effect against Candida albicans, while 2b was the most potent toward Aspergillus flavus Link. The compound 2f has repellent effect. With respect to the in vitro antitumor screening, this was done on different human cancer cell lines; namely PC3, HepG-2, HCT-116, MCF-7 and also on normal human cell lines; as MCF-10 and MCF-12 (normal breast epithelial cell and non-tumorigenic breast epithelial cell line) in a monolayer culture model where screening has been conducted at 100µg/ml (single dose test). Single dose test (100µg/ml) showed that, in case of PC3, all compounds have cytotoxic activity over 90% inhibition, 4 compounds have cytotoxic activity with 100% inhibition with Human colon cancer cell line, 4 compounds showed over 90% inhibition with MCF7 cell line and 4 compounds showed cytotoxic activity over 90% inhibition with HepG-2. Results of IC50 values for most promising compounds showed compounds with values lower than 20µM for all tested human cancer cell line. The promising hydrazonoyl halide 2c and 2f were selected for molecular study to know how they could act inside cancer cell causing death. Two biochemical tests were performed using the two halides 2c and 2f to predict their mechanism of action against breast carcinoma. Real time PCR analysis indicates that the two compounds induced the apoptosis of MCF7 cells through the up regulation of caspase-3, BAX mediated P53 mechanism but unfortunately, they promote the expression of anti-apoptotic protein BCL2. Also, cell cycle assay was performed using two different cell lines MCF7 and HCT116 and data revealed that the two compounds 2c and 2f induced apoptotic cells death of both lines via cell growth arrest at G2/M phase. In addition, it was noted that 2c induced arrest in the two lines more efficiently than 2f at G2/M phase.