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1.
Front Cell Dev Biol ; 7: 16, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30834247

RESUMO

Notwithstanding cancer patients benefit from a plethora of therapeutic alternatives, drug resistance remains a critical hurdle. Indeed, the high mortality rate is associated with metastatic disease, which is mostly incurable due to the refractoriness of metastatic cells to current treatments. Increasing data demonstrate that tumors contain a small subpopulation of cancer stem cells (CSCs) able to establish primary tumor and metastasis. CSCs are endowed with multiple treatment resistance capabilities comprising a highly efficient DNA damage repair machinery, the activation of survival pathways, enhanced cellular plasticity, immune evasion and the adaptation to a hostile microenvironment. Due to the presence of distinct cell populations within a tumor, cancer research has to face the major challenge of targeting the intra-tumoral as well as inter-tumoral heterogeneity. Thus, targeting molecular drivers operating in CSCs, in combination with standard treatments, may improve cancer patients' outcomes, yielding long-lasting responses. Here, we report a comprehensive overview on the most significant therapeutic advances that have changed the known paradigms of cancer treatment with a particular emphasis on newly developed compounds that selectively affect the CSC population. Specifically, we are focusing on innovative therapeutic approaches including differentiation therapy, anti-angiogenic compounds, immunotherapy and inhibition of epigenetic enzymes and microenvironmental cues.

2.
Nat Commun ; 9(1): 3921, 2018 09 20.
Artigo em Inglês | MEDLINE | ID: mdl-30237396

RESUMO

The original version of this Article contained an error in the spelling of the author Miriam Gaggianesi, which was incorrectly given as Miriam Giaggianesi. Furthermore, the affiliation details for Gabriella Gaudioso, Valentina Vaira, and Silvano Bosari incorrectly omitted 'Division of Pathology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, 20122, Italy'. Finally, the affiliation details for Alice Turdo, Miriam Gaggianesi, Aurora Chinnici and Elisa Lipari were incorrectly given as 'Dipartimento di Biotecnologie Mediche e Medicina Legale Sezione di Biochimica Medica, Facoltà di Medicina e Chirurgia, Policlinico "P.Giaccone", Università di Palermo, Palermo, 90127, Italy'. The correct affiliation is 'Department of Surgical, Oncological and Stomatological Sciences, University of Palermo, Palermo, 90127, Italy'. These errors have now been corrected in both the PDF and HTML versions of the Article.

3.
Nat Commun ; 9(1): 1024, 2018 03 09.
Artigo em Inglês | MEDLINE | ID: mdl-29523784

RESUMO

Breast cancer consists of highly heterogeneous tumors, whose cell of origin and driver oncogenes are difficult to be uniquely defined. Here we report that MYC acts as tumor reprogramming factor in mammary epithelial cells by inducing an alternative epigenetic program, which triggers loss of cell identity and activation of oncogenic pathways. Overexpression of MYC induces transcriptional repression of lineage-specifying transcription factors, causing decommissioning of luminal-specific enhancers. MYC-driven dedifferentiation supports the onset of a stem cell-like state by inducing the activation of de novo enhancers, which drive the transcriptional activation of oncogenic pathways. Furthermore, we demonstrate that the MYC-driven epigenetic reprogramming favors the formation and maintenance of tumor-initiating cells endowed with metastatic capacity. This study supports the notion that MYC-driven tumor initiation relies on cell reprogramming, which is mediated by the activation of MYC-dependent oncogenic enhancers, thus establishing a therapeutic rational for treating basal-like breast cancers.


Assuntos
Neoplasias da Mama/metabolismo , Epigênese Genética , Células-Tronco Neoplásicas/metabolismo , Proteínas Proto-Oncogênicas c-myc/genética , Proteínas Proto-Oncogênicas c-myc/metabolismo , Animais , Neoplasias da Mama/genética , Neoplasias da Mama/fisiopatologia , Carcinogênese , Linhagem Celular Tumoral , Reprogramação Celular , Elementos Facilitadores Genéticos , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Camundongos , Camundongos SCID , Células-Tronco Neoplásicas/citologia
4.
Cancer Res ; 77(12): 3268-3279, 2017 06 15.
Artigo em Inglês | MEDLINE | ID: mdl-28400477

RESUMO

The tumor microenvironment supplies proinflammatory cytokines favoring a permissive milieu for cancer cell growth and invasive behavior. Here we show how breast cancer progression is facilitated by IL4 secreted by adipose tissue and estrogen receptor-positive and triple-negative breast cancer cell types. Blocking autocrine and paracrine IL4 signaling with the IL4Rα antagonist IL4DM compromised breast cancer cell proliferation, invasion, and tumor growth by downregulating MAPK pathway activity. IL4DM reduced numbers of CD44+/CD24- cancer stem-like cells and elevated expression of the dual specificity phosphatase DUSP4 by inhibiting NF-κB. Enforced expression of DUSP4 drove conversion of metastatic cells to nonmetastatic cells. Mechanistically, RNAi-mediated attenuation of DUSP4 activated the ERK and p38 MAPK pathways, increased stem-like properties, and spawned metastatic capacity. Targeting IL4 signaling sensitized breast cancer cells to anticancer therapy and strengthened immune responses by enhancing the number of IFNγ-positive CTLs. Our results showed the role of IL4 in promoting breast cancer aggressiveness and how its targeting may improve the efficacy of current therapies. Cancer Res; 77(12); 3268-79. ©2017 AACR.


Assuntos
Neoplasias da Mama/patologia , Fosfatases de Especificidade Dupla/metabolismo , Interleucina-4/metabolismo , Fosfatases da Proteína Quinase Ativada por Mitógeno/metabolismo , Microambiente Tumoral , Western Blotting , Neoplasias da Mama/metabolismo , Linhagem Celular Tumoral , Progressão da Doença , Feminino , Citometria de Fluxo , Xenoenxertos , Humanos
5.
Eur J Med Chem ; 124: 435-444, 2016 Nov 29.
Artigo em Inglês | MEDLINE | ID: mdl-27597419

RESUMO

The dopamine-amino acid conjugate DA-Phen was firstly designed to obtain a useful prodrug for the therapy of Parkinson's disease, but experimental evidence shows that it effectively interacts with D1 dopamine receptors (D1DRs), leading to an enhancement in cognitive flexibility and to the development of adaptive strategies in aversive mazes, together with a decrease in despair-like behavior. In this paper, homology modelling, molecular dynamics, and site mapping of D1 receptor were carried out with the aim of further performing docking studies on other dopamine conjugates compared with D1 agonists, in the attempt to identify new compounds with potential dopaminergic activity. Two new conjugates (DA-Trp 2C, and DA-Leu 3C) have been identified as the most promising candidates, and consequently synthesized. Preliminary evaluation in terms of distribution coefficient (DpH7.4), stability in rat brain homogenate, and in human plasma confirmed that DA-Trp (2C), and DA-Leu (3C) could be considered as very valuable candidates for further in vivo studies as new dopaminergic drugs.


Assuntos
Aminoácidos/química , Dopaminérgicos/química , Dopaminérgicos/farmacologia , Dopamina/química , Dopamina/farmacologia , Desenho de Fármacos , Receptores de Dopamina D1/metabolismo , Animais , Encéfalo/metabolismo , Domínio Catalítico , Técnicas de Química Sintética , Dopamina/síntese química , Dopamina/metabolismo , Dopaminérgicos/síntese química , Dopaminérgicos/metabolismo , Estabilidade de Medicamentos , Humanos , Simulação de Acoplamento Molecular , Ratos , Receptores de Dopamina D1/química
6.
Oncotarget ; 7(34): 54157-54173, 2016 Aug 23.
Artigo em Inglês | MEDLINE | ID: mdl-27494839

RESUMO

P63 is a transcription factor belonging to the family of p53, essential for the development and differentiation of epithelia. In recent years, it has become clear that altered expression of the different isoforms of this gene can play an important role in carcinogenesis. The p63 gene encodes for two main isoforms known as TA and ΔN p63 with different functions. The role of these different isoforms in sustaining tumor progression and metastatic spreading however has not entirely been clarified. Here we show that breast cancer initiating cells express ΔNp63 isoform that supports a more mesenchymal phenotype associated with a higher tumorigenic and metastatic potential. On the contrary, the majority of cells within the tumor appears to express predominantly TAp63 isoform. While ΔNp63 exerts its effects by regulating a PI3K/CD44v6 pathway, TAp63 modulates this pathway in an opposite fashion. As a result, tumorigenicity and invasive capacity of breast cancer cells is a balance of the two isoforms. Finally, we found that tumor microenvironmental cytokines significantly contribute to the establishment of breast cancer cell phenotype by positively regulating ΔNp63 and CD44v6 expression.


Assuntos
Neoplasias da Mama/patologia , Receptores de Hialuronatos/fisiologia , Proteínas de Membrana/fisiologia , Fosfatidilinositol 3-Quinases/fisiologia , Idoso , Idoso de 80 Anos ou mais , Animais , Neoplasias da Mama/genética , Resistencia a Medicamentos Antineoplásicos , Transição Epitelial-Mesenquimal , Feminino , Humanos , Camundongos , Pessoa de Meia-Idade , Metástase Neoplásica , Proteínas Proto-Oncogênicas c-akt/fisiologia , Transdução de Sinais/fisiologia , Microambiente Tumoral
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