Author:
A Boudjlida, S Kaci, S Karaki, T Benayad, P Rocchi, D Smati, S Bouguerra Aouichat
Publication Date:
01 Sep 2019
Source:
South African Journal of Botany
Description:
Berberis (Barberry) species contain an important amount of alkaloids and are commonly used in traditional medicine. Alkaloids are preponderantly characterized by their numerous properties including anticancer activity. The aims of the present study were to investigate the effect and the mechanism of action of the Algerian Berberis hispanica alkaloids extract (BHAE) on Hep-2 laryngeal cancer cells. In this purpose, total alkaloids were extracted from the roots bark of the plant, then, were submitted to HPLC analysis. In order to determine the cells inhibition concentration (IC50), we used the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Cells were enumerated using Trypan blue exclusion assay and viability by cell cycle analysis. The morphology was assessed by coloration with May Grunwald Giemsa (MGG). The evaluation of such stress markers as malondialdehyde (MDA), cytochrome …
Author:
Yiwen Dong, Tianzhu Yu, Ling Ding, Erik Laurini, Yuanyu Huang, Mengjie Zhang, Yuhua Weng, Shuting Lin, Peng Chen, Domenico Marson, Yifan Jiang, Suzanne Giorgio, Sabrina Pricl, Xiaoxuan Liu, Palma Rocchi, Ling Peng
Publication Date:
22 Oct 2018
Source:
Journal of the American Chemical Society
Description:
Small interfering RNA (siRNA) is emerging as a novel therapeutic for treating various diseases, provided a safe and efficient delivery is available. In particular, specific delivery to target cells is critical for achieving high therapeutic efficacy while reducing toxicity. Amphiphilic dendrimers are emerging as novel promising carriers for siRNA delivery by virtue of the combined multivalent cooperativity of dendrimers with the self-assembling property of lipid vectors. Here, we report a ballistic approach for targeted siRNA delivery to cancer cells using an amphiphilic dendrimer equipped with a dual targeting peptide bearing an RGDK warhead. According to the molecular design, the amphiphilic dendrimer was expected to deliver siRNA effectively, while the aim of the targeting peptide was to home in on tumors via interaction of its warhead with integrin and the neuropilin-1 receptor on cancer cells. Coating the positively …
Author:
Hajer Ziouziou, Claudia Andrieu, Erik Laurini, Sara Karaki, Maurizio Fermeglia, Ridha Oueslati, David Taieb, Michel Camplo, Olivier Siri, Sabrina Pricl, Maria Katsogiannou, Palma Rocchi
Publication Date:
19 Jun 2018
Description:
Correction: Targeting Hsp27/eIF4E interaction with phenazine compound: a promising
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Author:
David Taïeb, Jean-Marc Foletti, Manuel Bardiès, Palma Rocchi, Rodney J Hicks, Uwe Haberkorn
Publication Date:
01 May 2018
Source:
Journal of Nuclear Medicine
Description:
The promise of prostate-specific membrane antigen (PSMA)–targeted radionuclide therapy is being demonstrated by a growing number of reports detailing institutional experience with various agents, and prospective clinical trials are in progress to further establish the safety and efficacy of this approach in advanced, castrate-resistant prostate cancer. Although extremely promising, PSMA-ligand therapy remains a noncurative treatment, and therefore, the prolongation of survival and amelioration of diseaserelated symptoms must be balanced against the direct toxicities of the treatment and their impact on quality of life. Of these, xerostomia is among the most common and debilitating, particularly for 225Ac-PSMA. The nature of this dysfunction is incompletely understood, and strategies for its prevention and treatment are still under evaluation.The salivary glands are divided into major (parotid, submandibular, and …
Author:
Hajer Ziouziou, Claudia Andrieu, Erik Laurini, Sara Karaki, Maurizio Fermeglia, Ridha Oueslati, David Taieb, Michel Camplo, Olivier Siri, Sabrina Pricl, Maria Katsogiannou, Palma Rocchi
Publication Date:
24 Aug 2017
Description:
The actual strategy to improve current therapies in advanced prostate cancer involves targeting genes activated by androgen withdrawal, either to delay or prevent the emergence of the castration-refractory phenotype. However, these genes are often implicated in several physiological processes, and long-term inhibition of survival proteins might be accompanied with cytotoxic effects. To avoid this problem, an alternative therapeutic strategy relies on the identification and use of compounds that disrupt specific protein-protein interactions involved in androgen withdrawal. Specifically, the interaction of the chaperone protein Hsp27 with the initiation factor eIF4E leads to the protection of protein synthesis initiation process and enhances cell survival during cell stress induced by castration or chemotherapy. Thus, in this work we aimed at i) identifying the interaction site of the Hsp27/eIF4E complex and ii) interfere with …
Author:
Sara Karaki, Sebastien Benizri, Raquel Mejías, Virginie Baylot, Nicolas Branger, Tan Nguyen, Brune Vialet, Khalid Oumzil, Philippe Barthélémy, Palma Rocchi
Publication Date:
28 Jul 2017
Source:
Journal of controlled release
Description:
Translationally controlled tumor protein (TCTP) has been implicated in a plethora of important cellular processes related to cell growth, cell cycle progression, malignant transformation and inhibition of apoptosis. Therefore, TCTP is now recognized as a potential therapeutic target in several cancers including prostate, breast and lung cancers. We previously showed that TCTP is overexpressed in castration-resistant prostate cancer (CRPC), and it has been implicated resistance to treatment. Recently, we developed TCTP antisense oligonucleotides (ASOs) to inhibit TCTP expression. However, the intracellular delivery and silencing activity of these oligonucleotides remains a challenge, and depend on the use of transfection agents and delivery systems. Here we show that lipid-modified ASO (LASOs) has improved penetration and efficiency in inhibiting TCTP expression in the absence of additional transfection …
Author:
Maria Cristina Falconieri, Mauro Adamo, Claudio Monasterolo, Maria Camilla Bergonzi, Marcella Coronnello, Anna Rita Bilia
Publication Date:
01 Mar 2017
Description:
Curcumin, the main curcuminoid of the popular Indian spice turmeric, is a potent chemopreventive agent and useful in many different diseases. A major limitation of applicability of curcumin as a health promoting and medicinal agent is its extremely low bioavailability due to efficient first pass metabolism, poor gastrointestinal absorption, rapid elimination, and poor aqueous solubility. In the present study, nanotechnology was selected as a choice approach to enhance the bioavailability of the curcuminis. A new polyamidoamine dendrimer (G0.5) was synthesized, characterized, and tested for cytotoxicity in human breast cancer cells (MCF-7). No cytotoxicity of G0.5 was found in the range between 10−3 and 3 × 10−8 M. Consequently, G0.5 was used to prepare spherical nanoparticles of ca. 150 nm, which were loaded with curcumin [molar ratio G0.5/curcumin 1 : 1 (formulation 1) and 1 : 0.5 (formulation 2 …
Author:
Xiaoxuan Liu, Yang Wang, Chao Chen, Aura Tintaru, Yu Cao, Juan Liu, Fabio Ziarelli, Jingjie Tang, Hongbo Guo, Roseline Rosas, Suzanne Giorgio, Laurence Charles, Palma Rocchi, Ling Peng
Publication Date:
01 Dec 2016
Source:
Advanced Functional Materials
Description:
Functional materials capable of responding to stimuli intrinsic to diseases are extremely important for specific drug delivery at the disease site. However, developing on‐demand stimulus‐responsive vectors for targeted delivery is highly challenging. Here, a stimulus‐responsive fluorinated bola‐amphiphilic dendrimer is reported for on‐demand delivery of small interfering RNA (siRNA) in response to the characteristic high level of reactive oxygen species (ROS) in cancer cells. This dendrimer bears a ROS‐sensitive thioacetal in the hydrophobic core and positively charged poly(amidoamine) dendrons at the terminals, capable of interacting and compacting the negatively charged siRNA into nanoparticles to protect the siRNA and promote cellular uptake. The ROS‐sensitive feature of this dendrimer boosts specific and efficient disassembly of the siRNA/vector complexes in ROS‐rich cancer cells for effective siRNA …
Author:
Chao Chen, Paola Posocco, Xiaoxuan Liu, Qiang Cheng, Erik Laurini, Jiehua Zhou, Cheng Liu, Yang Wang, Jingjie Tang, Valentina Dal Col, Tianzhu Yu, Suzanne Giorgio, Maurizio Fermeglia, Fanqi Qu, Zicai Liang, John J Rossi, Minghua Liu, Palma Rocchi, Sabrina Pricl, Ling Peng
Publication Date:
01 Jul 2016
Description:
Self‐assembly is a fundamental concept and a powerful approach in molecular science. However, creating functional materials with the desired properties through self‐assembly remains challenging. In this work, through a combination of experimental and computational approaches, the self‐assembly of small amphiphilic dendrons into nanosized supramolecular dendrimer micelles with a degree of structural definition similar to traditional covalent high‐generation dendrimers is reported. It is demonstrated that, with the optimal balance of hydrophobicity and hydrophilicity, one of the self‐assembled nanomicellar systems, totally devoid of toxic side effects, is able to deliver small interfering RNA and achieve effective gene silencing both in cells – including the highly refractory human hematopoietic CD34+ stem cells – and in vivo, thus paving the way for future biomedical implementation. This work presents a case …
Author:
Chao Chen, Paola Posocco, Xiaoxuan Liu, Qiang Cheng, Erik Laurini, Jiehua Zhou, Cheng Liu, Yang Wang, Jingjie Tang, Valentina Dal Col, Tianzhu Yu, Suzanne Giorgio, Maurizio Fermeglia, Fanqi Qu, Zicai Liang, John J Rossi, Minghua Liu, Palma Rocchi, Sabrina Pricl, Ling Peng
Publication Date:
01 Jul 2016
Description:
Supramolecular dendrimers created from small amphiphilic dendrons are able to mimic covalently constructed high-generation dendrimers for siRNA delivery, as presented by S. Pricl, L. Peng, and co-workers on page 3667. An optimal balance between the hydrophobic alkyl chain length and the hydrophilic dendritic portion is crucial for self-assembly of these amphiphilic dendrons into micellar nanostructures, and critically impacts the effectiveness of siRNA delivery and functional gene silencing.
