scholarly journals Antitumor activity of Apocynaceae species used in Amazon traditional medicine

2020 ◽  
Vol 9 (10) ◽  
pp. e9149109241
Author(s):  
Mirian Letícia Carmo Bastos ◽  
Rosana Moura Sarmento ◽  
Marcelo de Oliveira Bahia ◽  
Jaqueline da Silva Rodrigues ◽  
Valdicley Vieira Vale ◽  
...  
Keyword(s):  
Topoisomerase I ◽  
Cellular Response ◽  
Antitumor Agents ◽  
Chemical Compositions ◽  
Anticancer Activities ◽  
Asclepias Curassavica ◽  
Action Mechanisms ◽  
Underlying Mechanisms ◽  
Cellular Cytoskeleton

This study reviews the use of Apocynaceae species for cancer and tumor treatment in the Amazon. Databases and books were searched for ethnobotanical and phytochemical evaluations of the cytotoxic and anticancer activities of Apocynaceae species. The literature reports the use of several Amazonian species, such as Asclepias curassavica, Himatanthus articulates, and Macoubea sprucei, in treating tumors and cancers. Phytochemical studies on A. curassavica and H. articulatus have shown their chemical compositions to be variable, possessing cardenolides, iridoids, flavonoids, steroids, and terpenes. Most of the species have not been subjected to in vitro experiments for anticancer activity, and the evaluated species showed moderate-to-weak responses or were inactive. Other studies have shown that iridoids, flavonoids, and steroids are promising as antitumor treatments. The following action mechanisms have been attributed to iridoids: topoisomerase I-DNA complex stabilization, cellular cytoskeleton alteration, and induction of apoptosis. The activities of flavonoids have been reported to include apoptosis induction in liver tumor cells. Some authors suggest that flavonoids reduce oxidative stress cellular response which reduces mitochondrial dysfunction and cell death. In summary, Apocynaceae species appear to be promising as a source for antitumor agents; however, further studies are required to confirm their antitumor activities and to better elucidate the underlying mechanisms involved.

scholarly journals Synthesis and biological evaluation of novel benzo[b]xanthone derivatives as potential antitumor agents

2013 ◽  
Vol 78 (9) ◽  
pp. 1301-1308 ◽  
Author(s):  
Lin Luo ◽  
Jiang-Ke Qin ◽  
Zhi-Kai Dai ◽  
Shi-Hua Gao
Keyword(s):  
Cell Lines ◽  
Antitumor Agents ◽  
Biological Evaluation ◽  
Structural Factors ◽  
Anticancer Activities ◽  
Antitumor Activities ◽  
Mtt Method ◽  
Human Solid Tumor ◽  
Synthesis And Biological Evaluation

Nine novel aminoalkoxy substituted benzoxanthones (3a-3i) were synthesized. Their antitumor activities were evaluated in five human solid tumor cell lines including Hep-G2, BEL-7402, HeLa, MGC-803 and CNE by MTT method. The results showed that most of the compounds displayed moderate to good inhibitory activities on the tested cancer cell lines in vitro, among them compounds 3a and 3h showed higher antitumor activity than other tested compounds against most cell lines. The influence of two kinds of structural factors including the terminal amino group and length of carbon spacers on the anticancer activities were explored to discuss the preliminary structure-activity relationships.

scholarly journals Biological Properties of 6-Gingerol: A Brief Review

2014 ◽  
Vol 9 (7) ◽  
pp. 1934578X1400900 ◽  
Author(s):  
Shaopeng Wang ◽  
Caihua Zhang ◽  
Guang Yang ◽  
Yanzong Yang
Keyword(s):  
Fruits And Vegetables ◽  
Biological Activities ◽  
Zingiber Officinale ◽  
Biological Properties ◽  
Anticancer Activities ◽  
Inhibition Of Angiogenesis ◽  
Underlying Mechanisms ◽  
Pharmacologically Active

Numerous studies have revealed that regular consumption of certain fruits and vegetables can reduce the risk of many diseases. The rhizome of Zingiber officinale (ginger) is consumed worldwide as a spice and herbal medicine. It contains pungent phenolic substances collectively known as gingerols. 6-Gingerol is the major pharmacologically-active component of ginger. It is known to exhibit a variety of biological activities including anticancer, anti-inflammation, and anti-oxidation. 6-Gingerol has been found to possess anticancer activities via its effect on a variety of biological pathways involved in apoptosis, cell cycle regulation, cytotoxic activity, and inhibition of angiogenesis. Thus, due to its efficacy and regulation of multiple targets, as well as its safety for human use, 6-gingerol has received considerable interest as a potential therapeutic agent for the prevention and/or treatment of various diseases. Taken together, this review summarizes the various in vitro and in vivo pharmacological aspects of 6-gingerol and the underlying mechanisms.

scholarly journals Structural and functional interactions of the prostate cancer suppressor protein NKX3.1 with topoisomerase I

2013 ◽  
Vol 453 (1) ◽  
pp. 125-136 ◽  
Author(s):  
Liang-Nian Song ◽  
Cai Bowen ◽  
Edward P. Gelmann
Keyword(s):  
Dna Damage ◽  
Protein Interactions ◽  
Topoisomerase I ◽  
Cellular Response ◽  
Peptide Fragments ◽  
The Core ◽  
Tumour Suppressor Protein ◽  
Linker Domain ◽  
In Cells

NKX3.1 (NK3 homeobox 1) is a prostate tumour suppressor protein with a number of activities that are critical for its role in tumour suppression. NKX3.1 mediates the cellular response to DNA damage by interacting with ATM (ataxia telangiectasia mutated) and by activation of topoisomerase I. In the present study we characterized the interaction between NKX3.1 and topoisomerase I. The NKX3.1 homeodomain binds to a region of topoisomerase I spanning the junction between the core and linker domains. Loss of the topoisomerase I N-terminal domain, a region for frequent protein interactions, did not affect binding to NKX3.1 as was shown by the activation of Topo70 (N-terminal truncated topoisomerase I) in vitro. In contrast, NKX3.1 interacts with the enzyme reconstituted from peptide fragments of the core and linker active site domains, but inhibits the DNA-resolving activity of the reconstituted enzyme in vitro. The effect of NKX3.1 on both Topo70 and the reconstituted enzyme was seen in the presence and absence of camptothecin. Neither NKX3.1 nor CPT (camptothecin) had an effect on the interaction of the other with topoisomerase I. Therefore the interactions of NKX3.1 and CPT with the linker domain of topoisomerase I are mutually exclusive. However, in cells the effect of NKX3.1 on topoisomerase binding to DNA sensitized the cells to cellular toxicity and the induction of apoptosis by low doses of CPT. Lastly, topoisomerase I is important for the effect of NKX3.1 on cell survival after DNA damage as topoisomerase knockdown blocked the effect of NKX3.1 on clonogenicity after DNA damage. Therefore NKX3.1 and topoisomerase I interact in vitro and in cells to affect the CPT sensitivity and DNA-repair functions of NKX3.1.

scholarly journals Chemical Compositions of the Essential Oil Extracted from the Seeds of Garcina Kola, and Its Biological Activities

2021 ◽  
Vol 14 (2) ◽  
pp. 607-621
Author(s):  
Olagoke Zacchaeus Olatunde ◽  
Danian Tian ◽  
Jianping Yong ◽  
Canzhong Lu
Keyword(s):  
Essential Oil ◽  
Biological Activities ◽  
Chemical Compositions ◽  
Anticancer Activities ◽  
Potent Inhibition ◽  
Icp Ms ◽  
Hela Cell Lines ◽  
Long Time ◽  
Human Breast Carcinoma Cells

The essential oil was obtained from the seeds of Garcina kola and its compositions were investigated by GC-MS and ICP-MS, respectively. 74 organic compounds and 9 trace elements beneficial to human health were confirmed in this oil. Then, the in vitro antioxidant and anticancer activities were evaluated accordingly. The results showed that this essential oil exhibited stronger antioxidant activity against DPPH⸱ with the scavenging rate of 94.19% at 0.2 mg/mL, as well as potent inhibition against gastric cancer, lung cancer(A549) and Hela cell lines with the inhibitions of 96.397%±0.929, 98.005%±0.513 and 94.77±2.09 respectively at 8.3 mg/mL. While it exhibited moderate inhibition against the human breast carcinoma cells (MCF-7) with the inhibition of 59.257%±4.544 at 8.3mg/mL. In consideration of Garcina kola being consumed in Nigeria for a long time, this essential oil obtained from the Garcina kola can be used in the field of food, cosmetic or drugs.

Metformin-induced anticancer activities: recent insights

2018 ◽  
Vol 399 (4) ◽  
pp. 321-335 ◽  
Author(s):  
Stephen Safe ◽  
Vijayalekshmi Nair ◽  
Keshav Karki
Keyword(s):  
Cancer Cells ◽  
Cancer Cell ◽  
Diabetic Patients ◽  
Anticancer Activities ◽  
Cancer Cell Growth ◽  
Cell Growth And Migration ◽  
Pancreatic Cancer Cells ◽  
Underlying Mechanisms

AbstractMetformin is a widely used antidiabetic drug, and there is evidence among diabetic patients that metformin is a chemopreventive agent against multiple cancers. There is also evidence in human studies that metformin is a cancer chemotherapeutic agent, and several clinical trials that use metformin alone or in combination with other drugs are ongoing.In vivoandin vitrocancer cell culture studies demonstrate that metformin induces both AMPK-dependent and AMPK-independent genes/pathways that result in inhibition of cancer cell growth and migration and induction of apoptosis. The effects of metformin in cancer cells resemble the patterns observed after treatment with drugs that downregulate specificity protein 1 (Sp1), Sp3 and Sp4 or by knockdown of Sp1, Sp3 and Sp4 by RNA interference. Studies in pancreatic cancer cells clearly demonstrate that metformin decreases expression of Sp1, Sp3, Sp4 and pro-oncogenic Sp-regulated genes, demonstrating that one of the underlying mechanisms of action of metformin as an anticancer agent involves targeting of Sp transcription factors. These observations are consistent with metformin-mediated effects on genes/pathways in many other tumor types.

scholarly journals Recent Advances in Improved Anticancer Efficacies of Camptothecin Nano-Formulations: A Systematic Review

Biomedicines ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 480
Author(s):  
Maryam Ghanbari-Movahed ◽  
Tea Kaceli ◽  
Arijit Mondal ◽  
Mohammad Hosein Farzaei ◽  
Anupam Bishayee
Keyword(s):  
Systematic Review ◽  
Antitumor Activity ◽  
Cancer Treatment ◽  
Topoisomerase I ◽  
Antitumor Agents ◽  
Critical Evaluation ◽  
Antitumor Activities ◽  
Passive Targeting

Camptothecin (CPT), a natural plant alkaloid, has indicated potent antitumor activities via targeting intracellular topoisomerase I. The promise that CPT holds in therapies is restricted through factors that include lactone ring instability and water insolubility, which limits the drug oral solubility and bioavailability in blood plasma. Novel strategies involving CPT pharmacological and low doses combined with nanoparticles have indicated potent anticancer activity in vitro and in vivo. This systematic review aims to provide a comprehensive and critical evaluation of the anticancer ability of nano-CPT in various cancers as a novel and more efficient natural compound for drug development. Studies were identified through systematic searches of PubMed, Scopus, and ScienceDirect. Eligibility checks were performed based on predefined selection criteria. Eighty-two papers were included in this systematic review. There was strong evidence for the association between antitumor activity and CPT treatment. Furthermore, studies indicated that CPT nano-formulations have higher antitumor activity in comparison to free CPT, which results in enhanced efficacy for cancer treatment. The results of our study indicate that CPT nano-formulations are a potent candidate for cancer treatment and may provide further support for the clinical application of natural antitumor agents with passive targeting of tumors in the future.

scholarly journals The Circadian Protein PER1 Modulates the Cellular Response to Anticancer Treatments

2021 ◽  
Vol 22 (6) ◽  
pp. 2974
Author(s):  
Marina Maria Bellet ◽  
Claudia Stincardini ◽  
Claudio Costantini ◽  
Marco Gargaro ◽  
Stefania Pieroni ◽  
...  
Keyword(s):  
Circadian Rhythms ◽  
Circadian Clock ◽  
Cancer Cells ◽  
Cellular Response ◽  
Molecular Mechanisms ◽  
Antitumor Agents ◽  
Pharmacological Therapy ◽  
Drug Induced

The circadian clock driven by the daily light–dark and temperature cycles of the environment regulates fundamental physiological processes and perturbations of these sophisticated mechanisms may result in pathological conditions, including cancer. While experimental evidence is building up to unravel the link between circadian rhythms and tumorigenesis, it is becoming increasingly apparent that the response to antitumor agents is similarly dependent on the circadian clock, given the dependence of each drug on the circadian regulation of cell cycle, DNA repair and apoptosis. However, the molecular mechanisms that link the circadian machinery to the action of anticancer treatments is still poorly understood, thus limiting the application of circadian rhythms-driven pharmacological therapy, or chronotherapy, in the clinical practice. Herein, we demonstrate the circadian protein period 1 (PER1) and the tumor suppressor p53 negatively cross-regulate each other’s expression and activity to modulate the sensitivity of cancer cells to anticancer treatments. Specifically, PER1 physically interacts with p53 to reduce its stability and impair its transcriptional activity, while p53 represses the transcription of PER1. Functionally, we could show that PER1 reduced the sensitivity of cancer cells to drug-induced apoptosis, both in vitro and in vivo in NOD scid gamma (NSG) mice xenotransplanted with a lung cancer cell line. Therefore, our results emphasize the importance of understanding the relationship between the circadian clock and tumor regulatory proteins as the basis for the future development of cancer chronotherapy.

Isoliquiritigenin (ISL) and its Formulations: Potential Antitumor Agents

2019 ◽  
Vol 26 (37) ◽  
pp. 6786-6796 ◽  
Author(s):  
Ting-Ting Zhao ◽  
Yu-Qing Xu ◽  
Hui-Min Hu ◽  
Hai-Bin Gong ◽  
Hai-Liang Zhu
Keyword(s):  
Cancer Cell ◽  
Antitumor Agents ◽  
Cancer Cell Line ◽  
Water Soluble ◽  
Licorice Root ◽  
Cancer Cell Proliferation ◽  
Comprehensive Overview ◽  
Underlying Mechanisms

Isoliquiritigenin (2’,4’,4-trihydroxychalcone, ISL) is one of the most important chalcone compounds which is mainly derived from licorice root and many other plants. It exhibits a remarkable range of potent biological and pharmacological activities such as antioxidative, antitumor, antiaging, anti-inflammatory, anti-diabetic activities, etc. Numerous research teams have demonstrated that ISL posseses the ability to carry out antigrowth and proliferation in various cancer cells in vitro and in vivo. Meanwhile, the underlying mechanisms of ISL that inhibit cancer cell proliferation have not been well explored. However, the poor bioavailability and low water-soluble limit its clinical application. This review aims at providing a comprehensive overview of the pharmacology antitumor activity of ISL and its mechanisms in different malignancy especially in breast cancer cell line and summarize developments of formulation utilized to overcome the barrier between its delivery characteristics and application in clinics over the past 20 years.

scholarly journals The Aza-Analogous Benzo[c]phenanthridine P8-D6 Acts as a Dual Topoisomerase I and II Poison, thus Exhibiting Potent Genotoxic Properties

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1524 ◽  
Author(s):  
Georg Aichinger ◽  
Falk-Bach Lichtenberger ◽  
Tamara N. Steinhauer ◽  
Inken Flörkemeier ◽  
Giorgia Del Favero ◽  
...  
Keyword(s):  
Comet Assay ◽  
Topoisomerase I ◽  
Human Tumor ◽  
Proliferating Cells ◽  
Covalently Linked ◽  
Underlying Mechanisms ◽  
Dna Strand ◽  
Ht 29

The benzo[c]phenanthridine P8-D6 was recently found to suppress the catalytic activity of both human topoisomerase (Topo) I and II. Concomitantly, potent cytotoxic activity was observed in different human tumor cell lines, raising questions about the underlying mechanisms in vitro. In the present study, we addressed the question of whether P8-D6 acts as a so-called Topo poison, stabilizing the covalent Topo–DNA intermediate, thus inducing fatal DNA strand breaks in proliferating cells. In HT-29 colon carcinoma cells, fluorescence imaging revealed P8-D6 to be taken up by the cells and to accumulate in the perinuclear region. Confocal microscopy demonstrated that the compound is partially located inside the nuclei, thus reaching the potential target. In the “in vivo complex of enzyme” (ICE) bioassay, treatment of HT-29 cells with P8-D6 for 1 h significantly enhanced the proportion of Topo I and II covalently linked to the DNA in concentrations ≥1 µM, indicating effective dual Topo poisoning. Potentially resulting DNA damage was analyzed by single-cell gel electrophoresis (“comet assay”). Already at 1 h of incubation, significant genotoxic effects were observed in the comet assay in concentrations as low as 1 nM. Taken together, the present study demonstrates the high Topo-poisoning and genotoxic potential of P8-D6 in human tumor cells.

scholarly journals Targeting MDM2 for Neuroblastoma Therapy: In Vitro and In Vivo Anticancer Activity and Mechanism of Action

Cancers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3651
Author(s):  
Wei Wang ◽  
Xinjie Wang ◽  
Mehrdad Rajaei ◽  
Ji Youn Youn ◽  
Atif Zafar ◽  
...  
Keyword(s):  
Neuroblastoma Cell ◽  
Wild Type ◽  
Anticancer Activities ◽  
High Risk Disease ◽  
M Phase ◽  
Mdm2 Expression ◽  
Xenograft Models ◽  
Underlying Mechanisms

Background: Neuroblastoma is an aggressive pediatric solid tumor with an overall survival rate of <50% for patients with high-risk disease. The majority (>98%) of pathologically-diagnosed neuroblastomas have wild-type p53 with intact functional activity. However, the mouse double minute 2 (MDM2) homolog, an E3 ubiquitin ligase, is overexpressed in neuroblastoma and leads to inhibition of p53. MDM2 also exerts p53-independent oncogenic functions. Thus, MDM2 seems to be an attractive target for the reactivation of p53 and attenuation of oncogenic activity in neuroblastoma. Methods: In this study, we evaluated the anticancer activities and underlying mechanisms of action of SP141, a first-in-class MDM2 inhibitor, in neuroblastoma cell lines with different p53 backgrounds. The findings were confirmed in mouse xenograft models of neuroblastoma. Results: We demonstrate that SP141 reduces neuroblastoma cell viability, induces apoptosis, arrests cells at the G2/M phase, and prevents cell migration, independent of p53. In addition, in neuroblastoma xenograft models, SP141 inhibited MDM2 expression and suppressed tumor growth without any host toxicity at the effective dose. Conclusions: MDM2 inhibition by SP141 results in the inhibition of neuroblastoma growth and metastasis, regardless of the p53 status of the cells and tumors. These findings provide proof-of-concept that SP141 represents a novel treatment option for both p53 wild-type and p53 null neuroblastoma.

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