LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 17

Search options

  1. Article: Reverting Immune Suppression to Enhance Cancer Immunotherapy.

    Guerrouahen, Bella S / Maccalli, Cristina / Cugno, Chiara / Rutella, Sergio / Akporiaye, Emmanuel T

    Frontiers in oncology

    2020  Volume 9, Page(s) 1554

    Abstract: Tumors employ strategies to escape immune control. The principle aim of most cancer immunotherapies is to restore effective immune surveillance. Among the different processes regulating immune escape, tumor microenvironment-associated soluble factors, ... ...

    Abstract Tumors employ strategies to escape immune control. The principle aim of most cancer immunotherapies is to restore effective immune surveillance. Among the different processes regulating immune escape, tumor microenvironment-associated soluble factors, and/or cell surface-bound molecules are mostly responsible for dysfunctional activity of tumor-specific CD8
    Language English
    Publishing date 2020-01-21
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2649216-7
    ISSN 2234-943X
    ISSN 2234-943X
    DOI 10.3389/fonc.2019.01554
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Enhancing Mesenchymal Stromal Cell Immunomodulation for Treating Conditions Influenced by the Immune System.

    Guerrouahen, Bella S / Sidahmed, Heba / Al Sulaiti, Asma / Al Khulaifi, Moza / Cugno, Chiara

    Stem cells international

    2019  Volume 2019, Page(s) 7219297

    Abstract: Mesenchymal stromal cells (MSCs), formerly known as mesenchymal stem cells, are nonhematopoietic multipotent cells and are emerging worldwide as the most clinically used and promising source for allogeneic cell therapy. MSCs, initially obtained from bone ...

    Abstract Mesenchymal stromal cells (MSCs), formerly known as mesenchymal stem cells, are nonhematopoietic multipotent cells and are emerging worldwide as the most clinically used and promising source for allogeneic cell therapy. MSCs, initially obtained from bone marrow, can be derived from several other tissues, such as adipose tissue, placenta, and umbilical cord. Diversity in tissue sourcing and manufacturing procedures has significant effects on MSC products. However, in 2006, a minimal set of standard criteria has been issued by the International Society of Cellular Therapy for defining derived MSCs. These include adherence to plastic in conventional culture conditions, particular phenotype, and multilineage differentiation capacity
    Language English
    Publishing date 2019-08-05
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2573856-2
    ISSN 1687-9678 ; 1687-966X
    ISSN (online) 1687-9678
    ISSN 1687-966X
    DOI 10.1155/2019/7219297
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Blockade of TGF-β signaling to enhance the antitumor response is accompanied by dysregulation of the functional activity of CD4

    Polanczyk, Magdalena J / Walker, Edwin / Haley, Daniel / Guerrouahen, Bella S / Akporiaye, Emmanuel T

    Journal of translational medicine

    2019  Volume 17, Issue 1, Page(s) 219

    Abstract: Background: The pleiotropic cytokine, transforming growth factor (TGF)-β, and CD4: Methods: Using BALB/c, FoxP3eGFP and Rag: Results: SM16 abrogates TGF-β-induced Treg generation in vitro but does not prevent global homeostatic expansion of CD4: ...

    Abstract Background: The pleiotropic cytokine, transforming growth factor (TGF)-β, and CD4
    Methods: Using BALB/c, FoxP3eGFP and Rag
    Results: SM16 abrogates TGF-β-induced Treg generation in vitro but does not prevent global homeostatic expansion of CD4
    Conclusions: These findings suggest that blockade of TGF-β signaling is a potentially useful strategy for blunting Treg function to enhance the anti-tumor response. Our data further suggest that the overall dampening of Treg function may involve the expansion of a quiescent Treg precursor population, which is CD4
    MeSH term(s) Animals ; Antineoplastic Agents/metabolism ; CD4 Antigens/metabolism ; CD4-Positive T-Lymphocytes/immunology ; Cell Count ; Cell Line, Tumor ; Cell Proliferation ; Female ; Forkhead Transcription Factors/metabolism ; Homeostasis ; Interferon-gamma/metabolism ; Interleukin-2 Receptor alpha Subunit/metabolism ; Lymph Nodes/cytology ; Mice, Knockout ; Neoplasms/pathology ; Signal Transduction ; Spleen/cytology ; T-Lymphocytes, Regulatory/immunology ; Transforming Growth Factor beta/metabolism ; Tumor Burden
    Chemical Substances Antineoplastic Agents ; CD4 Antigens ; Forkhead Transcription Factors ; Foxp3 protein, mouse ; Interleukin-2 Receptor alpha Subunit ; Transforming Growth Factor beta ; Interferon-gamma (82115-62-6)
    Language English
    Publishing date 2019-07-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1479-5876
    ISSN (online) 1479-5876
    DOI 10.1186/s12967-019-1967-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Nesting of colon and ovarian cancer cells in the endothelial niche is associated with alterations in glycan and lipid metabolism.

    Halama, Anna / Guerrouahen, Bella S / Pasquier, Jennifer / Satheesh, Noothan J / Suhre, Karsten / Rafii, Arash

    Scientific reports

    2017  Volume 7, Page(s) 39999

    Abstract: The metabolic phenotype of a cancer cell is determined by its genetic makeup and microenvironment, which dynamically modulates the tumor landscape. The endothelial cells provide both a promoting and protective microenvironment - a niche for cancer cells. ...

    Abstract The metabolic phenotype of a cancer cell is determined by its genetic makeup and microenvironment, which dynamically modulates the tumor landscape. The endothelial cells provide both a promoting and protective microenvironment - a niche for cancer cells. Although metabolic alterations associated with cancer and its progression have been fairly defined, there is a significant gap in our understanding of cancer metabolism in context of its microenvironment. We deployed an in vitro co-culture system based on direct contact of cancer cells with endothelial cells (E4
    MeSH term(s) Cell Line, Tumor ; Coculture Techniques ; Colonic Neoplasms/metabolism ; Endothelial Cells/metabolism ; Female ; Glycosylation ; Humans ; Lipid Metabolism ; Ovarian Neoplasms/metabolism ; Polysaccharides/metabolism ; Tumor Microenvironment
    Chemical Substances Polysaccharides
    Language English
    Publishing date 2017-01-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep39999
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: GMP-grade α-TEA lysine salt: a 28-Day oral toxicity and toxicokinetic study with a 28-Day recovery period in Beagle dogs.

    Guerrouahen, Bella S / Hahn, Tobias / Alderman, Zefora / Curti, Brendan / Urba, Walter / Akporiaye, Emmanuel T

    BMC cancer

    2016  Volume 16, Page(s) 199

    Abstract: Background: Alpha-tocopheryloxyacetic acid (α-TEA) is a semi-synthetic derivative of naturally occurring vitamin E (alpha-tocopherol) that can be delivered via an oral route. Preclinical in vitro and in vivo data demonstrated that α-TEA is a potent anti- ...

    Abstract Background: Alpha-tocopheryloxyacetic acid (α-TEA) is a semi-synthetic derivative of naturally occurring vitamin E (alpha-tocopherol) that can be delivered via an oral route. Preclinical in vitro and in vivo data demonstrated that α-TEA is a potent anti-tumor agent with a safe toxicity profile in mice. We report a comprehensive study to evaluate the toxokinetics of good manufacturing practice (GMP)-grade α-TEA in dogs after daily oral administration for 28 days, followed by a 28-day recovery period.
    Methods: Male and female beagle dogs received capsules of α-TEA Lysine Salt at doses of 100, 300, 1500 mg/kg/day. α-TEA plasma levels were determined by high-performance liquid chromatography (HPLC) with mass spectrometric detection. During the treatment, animals were observe for clinical signs, food consumption, body weight, and subjected to ophthalmoscopic, and electrocardiographic assessments. At the end of the dosing period, blood was taken and toxicokinetic analyses and histopathology assessments were performed when animals were necropsied.
    Results: Our findings showed that there was no α-TEA-related mortality or moribundity. At the highest dose, increases in white blood cells and fibrinogen levels were observed. These levels returned to normal at the end of the recovery period. Histopathological evaluation of major organs revealed no significant lesions related to α-TEA-treatment.
    Conclusion: We demonstrate that for designing clinical trials in patients, the highest non-severely toxic dose (HNSTD) of α-TEA is 1500 mg/kg/day in Beagle dogs and this data informed the design of dose-escalation studies of α-TEA in patients with advanced cancer.
    MeSH term(s) Administration, Oral ; Animals ; Antineoplastic Agents/administration & dosage ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacokinetics ; Antineoplastic Agents/toxicity ; Biopsy ; Blood Cell Count ; Blood Chemical Analysis ; Blood Coagulation/drug effects ; Blood Coagulation Tests ; Dogs ; Female ; Lysine ; Male ; Salts ; Time Factors ; Tocopherols/administration & dosage ; Tocopherols/chemistry ; Tocopherols/pharmacokinetics ; Tocopherols/toxicity ; Toxicity Tests ; Toxicokinetics ; Urinalysis
    Chemical Substances Antineoplastic Agents ; Salts ; 2,5,7,8-tetramethyl-2R-(4R,8R,12-trimethyltridecyl)chroman-6-yloxy acetic acid (JW7FJR3ZLY) ; Lysine (K3Z4F929H6) ; Tocopherols (R0ZB2556P8)
    Language English
    Publishing date 2016-03-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1471-2407
    ISSN (online) 1471-2407
    DOI 10.1186/s12885-016-2220-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Osteoblastic and vascular endothelial niches, their control on normal hematopoietic stem cells, and their consequences on the development of leukemia.

    Guerrouahen, Bella S / Al-Hijji, Ibrahim / Tabrizi, Arash Rafii

    Stem cells international

    2011  Volume 2011, Page(s) 375857

    Abstract: Stem cell self-renewal is regulated by intrinsic mechanisms and extrinsic signals mediated via specialized microenvironments called "niches." The best-characterized stem cell is the hematopoietic stem cell (HSC). Self-renewal and differentiation ability ... ...

    Abstract Stem cell self-renewal is regulated by intrinsic mechanisms and extrinsic signals mediated via specialized microenvironments called "niches." The best-characterized stem cell is the hematopoietic stem cell (HSC). Self-renewal and differentiation ability of HSC are regulated by two major elements: endosteal and vascular regulatory elements. The osteoblastic niche localized at the inner surface of the bone cavity might serve as a reservoir for long-term HSC storage in a quiescent state. Whereas the vascular niche, which consists of sinusoidal endothelial cell lining blood vessel, provides an environment for short-term HSC proliferation and differentiation. Both niches act together to maintain hematopoietic homeostasis. In this paper, we provide some principles applying to the hematopoietic niches, which will be useful in the study and understanding of other stem cell niches. We will discuss altered microenvironment signaling leading to myeloid lineage disease. And finally, we will review some data on the development of acute myeloid leukemia from a subpopulation called leukemia-initiating cells (LIC), and we will discuss on the emerging evidences supporting the influence of the microenvironment on chemotherapy resistance.
    Language English
    Publishing date 2011-12-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2573856-2
    ISSN 1687-9678 ; 1687-966X
    ISSN (online) 1687-9678
    ISSN 1687-966X
    DOI 10.4061/2011/375857
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Breast cancer cells promote a notch-dependent mesenchymal phenotype in endothelial cells participating to a pro-tumoral niche.

    Ghiabi, Pegah / Jiang, Jie / Pasquier, Jennifer / Maleki, Mahtab / Abu-Kaoud, Nadine / Halabi, Najeeb / Guerrouahen, Bella S / Rafii, Shahin / Rafii, Arash

    Journal of translational medicine

    2015  Volume 13, Page(s) 27

    Abstract: Background: Endothelial cells (ECs) are responsible for creating a tumor vascular niche as well as producing angiocrine factors. ECs demonstrate functional and phenotypic heterogeneity when located under different microenvironments. Here, we describe a ... ...

    Abstract Background: Endothelial cells (ECs) are responsible for creating a tumor vascular niche as well as producing angiocrine factors. ECs demonstrate functional and phenotypic heterogeneity when located under different microenvironments. Here, we describe a tumor-stimulated mesenchymal phenotype in ECs and investigate its impact on tumor growth, stemness, and invasiveness.
    Methods: Xenograft tumor assay in NOD/SCID mice and confocal imaging were conducted to show the acquisition of mesenchymal phenotype in tumor-associated ECs in vivo. Immunocytochemistry, qPCR and flow cytometry techniques showed the appearance of mesenchymal traits in ECs after contact with breast tumor cell lines MDA-MB231 or MCF-7. Cell proliferation, cell migration, and sphere formation assays were applied to display the functional advantages of mesenchymal ECs in tumor growth, invasiveness, and enrichment of tumor initiating cells. qPCR and western blotting were used to investigate the mechanisms underlying EC mesenchymal transition.
    Results: Our results showed that co-injection of ECs and tumor cells in NOD/SCID mice significantly enhanced tumor growth in vivo with tumor-associated ECs expressing mesenchymal markers while maintaining their intrinsic endothelial trait. We also showed that a mesenchymal phenotype is possibly detectable in human neoplastic breast biopsies as well as ECs pre-exposed to tumor cells (ECs(Mes)) in vitro. The ECs(Mes) acquired prolonged survival, increased migratory behavior and enhanced angiogenic properties. In return, ECs(Mes) were capable of enhancing tumor survival and invasiveness. The mesenchymal phenotypes in ECs(Mes) were the result of a contact-dependent transient phenomenon and reversed upon removal of the neoplastic contexture. We showed a synergistic role for TGFβ and notch pathways in this phenotypic change, as simultaneous inhibition of notch and TGFβ down-regulated Smad1/5 phosphorylation and Jag1(KD) tumor cells were unable to initiate the process.
    Conclusions: Overall, our data proposed a crosstalk mechanism between tumor and microenvironment where tumor-stimulated mesenchymal modulation of ECs enhanced the constitution of a transient mesenchymal/endothelial niche leading to significant increase in tumor proliferation, stemness, and invasiveness. The possible involvement of notch and TGFβ pathways in the initiation of mesenchymal phenotype may propose new stromal targets.
    MeSH term(s) Animals ; Breast Neoplasms/genetics ; Breast Neoplasms/metabolism ; Breast Neoplasms/pathology ; Cell Line, Tumor ; Cell Proliferation ; Female ; Gene Expression Regulation, Neoplastic ; Human Umbilical Vein Endothelial Cells/metabolism ; Human Umbilical Vein Endothelial Cells/pathology ; Humans ; Mesoderm/metabolism ; Mesoderm/pathology ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Phenotype ; Receptors, Notch/metabolism ; Signal Transduction/genetics ; Transcriptome/genetics ; Transforming Growth Factor beta/metabolism ; Tumor Microenvironment ; Xenograft Model Antitumor Assays
    Chemical Substances Receptors, Notch ; Transforming Growth Factor beta
    Language English
    Publishing date 2015-01-27
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1479-5876
    ISSN (online) 1479-5876
    DOI 10.1186/s12967-015-0386-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Metabolic signatures differentiate ovarian from colon cancer cell lines.

    Halama, Anna / Guerrouahen, Bella S / Pasquier, Jennifer / Diboun, Ilhem / Karoly, Edward D / Suhre, Karsten / Rafii, Arash

    Journal of translational medicine

    2015  Volume 13, Page(s) 223

    Abstract: Background: In this era of precision medicine, the deep and comprehensive characterization of tumor phenotypes will lead to therapeutic strategies beyond classical factors such as primary sites or anatomical staging. Recently, "-omics" approached have ... ...

    Abstract Background: In this era of precision medicine, the deep and comprehensive characterization of tumor phenotypes will lead to therapeutic strategies beyond classical factors such as primary sites or anatomical staging. Recently, "-omics" approached have enlightened our knowledge of tumor biology. Such approaches have been extensively implemented in order to provide biomarkers for monitoring of the disease as well as to improve readouts of therapeutic impact. The application of metabolomics to the study of cancer is especially beneficial, since it reflects the biochemical consequences of many cancer type-specific pathophysiological processes. Here, we characterize metabolic profiles of colon and ovarian cancer cell lines to provide broader insight into differentiating metabolic processes for prospective drug development and clinical screening.
    Methods: We applied non-targeted metabolomics-based mass spectroscopy combined with ultrahigh-performance liquid chromatography and gas chromatography for the metabolic phenotyping of four cancer cell lines: two from colon cancer (HCT15, HCT116) and two from ovarian cancer (OVCAR3, SKOV3). We used the MetaP server for statistical data analysis.
    Results: A total of 225 metabolites were detected in all four cell lines; 67 of these molecules significantly discriminated colon cancer from ovarian cancer cells. Metabolic signatures revealed in our study suggest elevated tricarboxylic acid cycle and lipid metabolism in ovarian cancer cell lines, as well as increased β-oxidation and urea cycle metabolism in colon cancer cell lines.
    Conclusions: Our study provides a panel of distinct metabolic fingerprints between colon and ovarian cancer cell lines. These may serve as potential drug targets, and now can be evaluated further in primary cells, biofluids, and tissue samples for biomarker purposes.
    MeSH term(s) Cell Line, Tumor ; Colonic Neoplasms/metabolism ; Female ; Humans ; Metabolic Networks and Pathways ; Metabolome ; Metabolomics/methods ; Ovarian Neoplasms/metabolism
    Language English
    Publishing date 2015-07-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1479-5876
    ISSN (online) 1479-5876
    DOI 10.1186/s12967-015-0576-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Tailoring cells for clinical needs: Meeting report from the Advanced Therapy in Healthcare symposium (October 28-29 2017, Doha, Qatar).

    Deola, Sara / Guerrouahen, Bella S / Sidahmed, Heba / Al-Mohannadi, Anjud / Elnaggar, Muhammad / Elsadig, Ramaz / Abdelalim, Essam M / Petrovski, Goran / Gadina, Massimo / Thrasher, Adrian / Wels, Winfried S / Hunger, Stephen P / Wang, Ena / Marincola, Francesco M / Maccalli, Cristina / Cugno, Chiara

    Journal of translational medicine

    2018  Volume 16, Issue 1, Page(s) 276

    Abstract: New technologies and therapies designed to facilitate development of personalized treatments are rapidly emerging in the field of biomedicine. Strikingly, the goal of personalized medicine refined the concept of therapy by developing cell-based therapies, ...

    Abstract New technologies and therapies designed to facilitate development of personalized treatments are rapidly emerging in the field of biomedicine. Strikingly, the goal of personalized medicine refined the concept of therapy by developing cell-based therapies, the so-called "living drugs". Breakthrough advancements were achieved in this regard in the fields of gene therapy, cell therapy, tissue-engineered products and advanced therapeutic techniques. The Advanced Therapies in Healthcare symposium, organized by the Clinical Research Center Department of Sidra Medicine, in Doha, Qatar (October 2017), brought together world-renowned experts from the fields of oncology, hematology, immunology, inflammation, autoimmune disorders, and stem cells to offer a comprehensive picture of the status of worldwide advanced therapies in both pre-clinical and clinical development, providing insights to the research phase, clinical data and regulatory aspects of these therapies. Highlights of the meeting are provided in this meeting report.
    MeSH term(s) Cell- and Tissue-Based Therapy ; Genetic Therapy ; Humans ; Immunotherapy ; Molecular Targeted Therapy ; Neoplasms/immunology ; Neoplasms/therapy ; Precision Medicine ; Qatar
    Language English
    Publishing date 2018-10-10
    Publishing country England
    Document type Congress ; Research Support, Non-U.S. Gov't
    ISSN 1479-5876
    ISSN (online) 1479-5876
    DOI 10.1186/s12967-018-1652-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: P-glycoprotein-activity measurements in multidrug resistant cell lines: single-cell versus single-well population fluorescence methods.

    Pasquier, Jennifer / Rioult, Damien / Abu-Kaoud, Nadine / Marie, Sabine / Rafii, Arash / Guerrouahen, Bella S / Le Foll, Frank

    BioMed research international

    2013  Volume 2013, Page(s) 676845

    Abstract: Background: P-gp expression has been linked to the efflux of chemotherapeutic drugs in human cancers leading to multidrug resistance. Fluorescence techniques have been widely applied to measure the P-gp activity. In this paper, there is a comparison ... ...

    Abstract Background: P-gp expression has been linked to the efflux of chemotherapeutic drugs in human cancers leading to multidrug resistance. Fluorescence techniques have been widely applied to measure the P-gp activity. In this paper, there is a comparison between the advantages of two fluorescence approaches of commonly available and affordable instruments: the microplate reader (MPR) and the flow cytometer to detect the P-gp efflux activity using calcein-AM.
    Results: The selectivity, sensibility, and reproducibility of the two methods have been defined. Our results showed that the MPR is more powerful for the detection of small inhibition, whereas the flow cytometry method is more reliable at higher concentrations of the inhibitors. We showed that to determine precisely the inhibition efficacy the flow cytometry is better; hence, to get the correct E max and EC50 values, we cannot only rely on the MPR.
    Conclusion: Both techniques can potentially be used extensively in the pharmaceutical industry for high-throughput drug screening and in biology laboratories for academic research, monitoring the P-gp efflux in specific assays.
    MeSH term(s) ATP Binding Cassette Transporter, Subfamily B/metabolism ; Cell Line, Tumor ; Drug Resistance, Multiple/physiology ; Drug Resistance, Neoplasm/physiology ; Fluoresceins/metabolism ; Fluorescence ; Humans ; MCF-7 Cells ; Reproducibility of Results
    Chemical Substances ATP Binding Cassette Transporter, Subfamily B ; Fluoresceins ; calcein AM (148504-34-1)
    Language English
    Publishing date 2013-11-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2698540-8
    ISSN 2314-6141 ; 2314-6133
    ISSN (online) 2314-6141
    ISSN 2314-6133
    DOI 10.1155/2013/676845
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top