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Selective Antitumor Activity of Datelliptium toward Medullary Thyroid Carcinoma by Downregulating RET Transcriptional Activity. Cancers (Basel) 2021; 13:cancers13133288. [PMID: 34209165 PMCID: PMC8267783 DOI: 10.3390/cancers13133288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/23/2021] [Accepted: 06/28/2021] [Indexed: 12/17/2022] Open
Abstract
Simple Summary Medullary thyroid carcinoma (MTC) is a rare aggressive type of thyroid cancer with a propensity for metastasizing to the lymph nodes, liver, bones, and lungs. Previous studies have demonstrated that activated REarranged during Transfection (RET) mutants are key regulators of invasive and metastatic behaviors in MTC. The present study aimed to evaluate the antiinvasive and antimetastatic potential of a novel RET transcription inhibitor, datelliptium, which stabilizes the RET G-quadruplex structures and suppresses RET oncogene transcription by examining its effects on epithelial-to-mesenchymal transition (EMT), cancer stem cells (CSCs), and MTC cell migration. Interestingly, the ablation of RET with datelliptium resulted in decreased EMT, spheroid formation, and MTC cell migration. In this study, we also demonstrated the in vivo antitumor activity in TT tumor-bearing mice with about 75% tumor growth inhibition. Abstract Medullary thyroid carcinoma (MTC) is a rare aggressive form of thyroid cancer with high rates of metastasis. Sporadic and hereditary MTC are strongly driven by somatic and germline mutations, respectively, in the transmembrane REarranged during Transfection (RET) proto-oncogene, which encodes a receptor tyrosine kinase. Our previous study identified datelliptium as a novel RET transcription inhibitor, which stabilizes the RET G-quadruplex structures and suppresses RET oncogene transcription. The present study aimed to elucidate the effect of datelliptium on the suppression of epithelial-to-mesenchymal transition (EMT) and metastasis-related behaviors of MTC cells, including cell migration and formation of cancer stem cells (CSCs). Our results demonstrated that datelliptium downregulated the expression of the mesenchymal markers, including N-cadherin, vimentin, slug, snail, and claudin-1. Compared to untreated cells, datelliptium significantly decreased the migration of TT cells in a dose-dependent manner in a wound healing assay. Additionally, datelliptium significantly reduced the size of preformed spheroids from TT cells over the time course. Finally, datelliptium inhibited approximately 75% of MTC xenograft growth with minimal systemic toxicity. In conclusion, datelliptium exerts its antitumor activity against MTC cells by reducing the EMT program, migratory ability, and self-renewal capacity of TT cells, thus preventing invasive and metastatic behavior of MTC.
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Falletta S, Partelli S, Rubini C, Nann D, Doria A, Marinoni I, Polenta V, Di Pasquale C, Degli Uberti E, Perren A, Falconi M, Zatelli MC. mTOR inhibitors response and mTOR pathway in pancreatic neuroendocrine tumors. Endocr Relat Cancer 2016; 23:883-891. [PMID: 27697900 DOI: 10.1530/erc-16-0329] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 10/03/2016] [Indexed: 12/19/2022]
Abstract
Medical therapy of pancreatic neuroendocrine tumors (P-NET) may take advantage of Everolimus treatment. However, the extent of therapeutic response cannot be predicted. This study was aimed to identify the possible predictive markers of response to Everolimus in P-NET. We found that Everolimus reduced the cell viability and induced apoptosis in primary cultures of 6 P-NET (P-NET-R), where the proliferative and antiapoptotic effects of IGF1 were blocked by Everolimus. On the contrary, 14 P-NET primary cultures (P-NET-NR) were resistant to Everolimus and IGF1, suggesting an involvement of PI3K/AKT/mTOR pathway in the mechanism of resistance. The response to Everolimus in vitro was associated with an active AKT/mTOR pathway and seemed to be associated with a greater clinical aggressiveness. In addition, a patient sensitive to Everolimus in vitro was sensitive to this drug in vivo also and showed a positive p-AKT immunohistochemistry (IHC) at tissue level. Similarly, a patient resistant to Everolimus treatment after surgery was not sensitive to the drug in vitro and had a negative p-AKT IHC staining. Therefore, present data confirm that P-NET primary cultures may be considered a model for testing medical treatment efficacy and that IHC characterization of p-AKT might help in identifying human P-NET who can benefit from Everolimus treatment. These data encourage conducting a prospective multicenter study involving different groups of P-NET patients treated with Everolimus.
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Affiliation(s)
- Simona Falletta
- Department of Medical ScienceSection of Endocrinology and Internal Medicine, University of Ferrara, Ferrara, Italy
| | - Stefano Partelli
- Pancreatic Surgery UnitPancreas Translational and Research Institute, San Raffaele Hospital, Vita-Salute San Raffaele University, Milan, Italy
| | - Corrado Rubini
- Department of Biomedical Sciences and Public HealthPolytechnic University of Marche, Ancona, Italy
| | - Dominik Nann
- Institut fur PathologieUniversity of Bern, Bern, Switzerland
| | - Andrea Doria
- Department of Biomedical Sciences and Public HealthPolytechnic University of Marche, Ancona, Italy
| | - Ilaria Marinoni
- Institut fur PathologieUniversity of Bern, Bern, Switzerland
| | - Vanessa Polenta
- Pancreatic Surgery UnitPancreas Translational and Research Institute, San Raffaele Hospital, Vita-Salute San Raffaele University, Milan, Italy
| | - Carmelina Di Pasquale
- Department of Medical ScienceSection of Endocrinology and Internal Medicine, University of Ferrara, Ferrara, Italy
| | - Ettore Degli Uberti
- Department of Medical ScienceSection of Endocrinology and Internal Medicine, University of Ferrara, Ferrara, Italy
| | - Aurel Perren
- Institut fur PathologieUniversity of Bern, Bern, Switzerland
| | - Massimo Falconi
- Pancreatic Surgery UnitPancreas Translational and Research Institute, San Raffaele Hospital, Vita-Salute San Raffaele University, Milan, Italy
| | - Maria Chiara Zatelli
- Department of Medical ScienceSection of Endocrinology and Internal Medicine, University of Ferrara, Ferrara, Italy
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Gentilin E, Di Pasquale C, Gagliano T, Tagliati F, Benfini K, Ambrosio MR, Bondanelli M, degli Uberti EC, Zatelli MC. Protein Kinase C Delta restrains growth in ACTH-secreting pituitary adenoma cells. Mol Cell Endocrinol 2016; 419:252-8. [PMID: 26522132 DOI: 10.1016/j.mce.2015.10.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 10/21/2015] [Accepted: 10/26/2015] [Indexed: 12/25/2022]
Abstract
Protein Kinase C Delta (PRKCD) has been highlighted among disrupted pathways in corticotroph adenomas. PRKCD is expressed at low level in human corticotroph adenomas and controls cell cycle in vitro. Therefore, PRKCD may play an important role in the development/progression of corticotroph adenomas, warranting further studies to understand the role of PRKCD and related pathways in restraining pituitary cell growth. We evaluated PRKCD role in influencing cell behavior in terms of cell viability, hormone expression and protein expression profile, by silencing PRKCD in AtT-20/D16v-F2 cells. PRKCD silencing increases cell viability, enhances hormone expression and induces morphological changes associated with deregulation of adhesion molecules. PRKCD silencing is associated with an increase in Epithelial Growth Factor Receptor (EGFR) expression, a marker of tumor aggressive behavior, and sensitivity to anti-EGFR molecules. PRKCD might restrain corticotroph adenoma cells from acquiring an aggressive behavior, candidating PRKCD as a possible molecular target for the treatment of corticotroph adenomas.
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Affiliation(s)
- Erica Gentilin
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy; Laboratorio in rete del Tecnopolo "Tecnologie delle terapie avanzate" (LTTA) of the University of Ferrara, Italy
| | - Carmelina Di Pasquale
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Teresa Gagliano
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Federico Tagliati
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Katiuscia Benfini
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Maria Rosaria Ambrosio
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Marta Bondanelli
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy
| | - Ettore C degli Uberti
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy; Laboratorio in rete del Tecnopolo "Tecnologie delle terapie avanzate" (LTTA) of the University of Ferrara, Italy
| | - Maria Chiara Zatelli
- Section of Endocrinology & Internal Medicine, Dept. of Medical Sciences, University of Ferrara, Italy; Laboratorio in rete del Tecnopolo "Tecnologie delle terapie avanzate" (LTTA) of the University of Ferrara, Italy.
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Gagliano T, Gentilin E, Tagliati F, Benfini K, Di Pasquale C, Feo C, Falletta S, Riva E, degli Uberti E, Zatelli MC. Inhibition of epithelial growth factor receptor can play an important role in reducing cell growth and survival in adrenocortical tumors. Biochem Pharmacol 2015; 98:639-48. [DOI: 10.1016/j.bcp.2015.10.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 10/15/2015] [Indexed: 12/13/2022]
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5
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Gagliano T, Gentilin E, Benfini K, Di Pasquale C, Tassinari M, Falletta S, Feo C, Tagliati F, Uberti ED, Zatelli MC. Mitotane enhances doxorubicin cytotoxic activity by inhibiting P-gp in human adrenocortical carcinoma cells. Endocrine 2014; 47:943-51. [PMID: 25096913 DOI: 10.1007/s12020-014-0374-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 07/25/2014] [Indexed: 01/12/2023]
Abstract
Mitotane is currently employed as adjuvant therapy as well as in the medical treatment of adrenocortical carcinoma (ACC), alone or in combination with chemotherapeutic agents. It was previously demonstrated that mitotane potentiates chemotherapeutic drugs cytotoxicity in cancer cells displaying chemoresistance due to P-glycoprotein (P-gp), an efflux pump involved in cancer multidrug resistance. The majority of ACC expresses high levels of P-gp and is highly chemoresistent. The aim of our study was to explore in vitro whether mitotane, at concentrations lower than those currently reached in vivo, may sensitize ACC cells to the cytotoxic effects of doxorubicin and whether this effect is due to a direct action on P-gp. NCI-H295 and SW13 cell lines as well as 4 adrenocortical neoplasia primary cultures were treated with mitotane and doxorubicin, and cell viability was measured by MTT assay. P-gp activity was measured by calcein and P-gp-Glo assays. P-gp expression was evaluated by Western blot. We found that very low mitotane concentrations sensitize ACC cells to the cytotoxic effects of doxorubicin, depending on P-gp expression. In addition, mitotane directly inhibits P-gp detoxifying function, allowing doxorubicin cytotoxic activity. These data provide the basis for the greater efficacy of combination therapy (mitotane plus chemotherapeutic drugs) on ACC patients. Shedding light on mitotane mechanisms of action could result in an improved design of drug therapy for patients with ACC.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/antagonists & inhibitors
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Adrenal Cortex Neoplasms/drug therapy
- Adrenal Cortex Neoplasms/metabolism
- Adrenal Cortex Neoplasms/pathology
- Adrenocortical Carcinoma/drug therapy
- Adrenocortical Carcinoma/metabolism
- Adrenocortical Carcinoma/pathology
- Antibiotics, Antineoplastic/pharmacology
- Antibiotics, Antineoplastic/therapeutic use
- Antineoplastic Agents, Hormonal/pharmacology
- Antineoplastic Agents, Hormonal/therapeutic use
- Cell Death/drug effects
- Cell Line, Tumor
- Cell Survival/drug effects
- Doxorubicin/pharmacology
- Doxorubicin/therapeutic use
- Drug Interactions
- Drug Therapy, Combination
- Humans
- Mitotane/pharmacology
- Mitotane/therapeutic use
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Affiliation(s)
- Teresa Gagliano
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Via A. Moro, 8, 44124, Ferrara, Italy
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Cai Z, Ouyang Q, Zeng D, Nguyen KN, Modi J, Wang L, White AG, Rogers BE, Xie XQ, Anderson CJ. 64Cu-labeled somatostatin analogues conjugated with cross-bridged phosphonate-based chelators via strain-promoted click chemistry for PET imaging: in silico through in vivo studies. J Med Chem 2014; 57:6019-29. [PMID: 24983404 PMCID: PMC4261236 DOI: 10.1021/jm500416f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
Somatostatin
receptor subtype 2 (sstr2) is a G-protein-coupled
receptor (GPCR) that is overexpressed in neuroendocrine tumors. The
homology model of sstr2 was built and was used to aid the design of
new somatostatin analogues modified with phosphonate-containing cross-bridged
chelators for evaluation of using them as PET imaging radiopharmaceuticals.
The new generation chelators were conjugated to Tyr3-octreotate
(Y3-TATE) through bioorthogonal, strain-promoted alkyne azide cycloaddition
(SPAAC) to form CB-TE1A1P–DBCO–Y3-TATE (AP) and CB-TE1K1P–PEG4–DBCO–Y3-TATE
(KP) in improved yields compared to standard direct conjugation methods
of amide bond formation. Consistent with docking studies, the clicked
bioconjugates showed high binding affinities to sstr2, with Kd values ranging from 0.6 to 2.3 nM. Selected
isomers of the clicked products were used in biodistribution and PET/CT
imaging. Introduction of the bulky dibenzocyclooctyne group in AP
decreased clearance rates from circulation. However, the additional
carboxylate group and PEG linker from the KP conjugate significantly
improved labeling conditions and in vivo stability of the copper complex
and ameliorated the slower pharmacokinetics of the clicked somatostatin
analogues.
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Affiliation(s)
- Zhengxin Cai
- Department of Radiology, §Department of Pharmaceutical Sciences, Computational Chemical Genomics Screening Center, School of Pharmacy, ¶Drug Discovery Institute, ⊥Department of Pharmacology and Chemical Biology, and ▲Department of Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15219, United States
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7
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Tagliati F, Gagliano T, Gentilin E, Minoia M, Molè D, delgi Uberti EC, Zatelli MC. Magmas overexpression inhibits staurosporine induced apoptosis in rat pituitary adenoma cell lines. PLoS One 2013; 8:e75194. [PMID: 24069394 PMCID: PMC3775776 DOI: 10.1371/journal.pone.0075194] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 08/14/2013] [Indexed: 12/22/2022] Open
Abstract
Magmas is a nuclear gene that encodes for the mitochondrial import inner membrane translocase subunit Tim16. Magmas is overexpressed in the majority of human pituitary adenomas and in a mouse ACTH-secreting pituitary adenoma cell line. Here we report that Magmas is highly expressed in two out of four rat pituitary adenoma cell lines and its expression levels inversely correlate to the extent of cellular response to staurosporine in terms of apoptosis activation and cell viability. Magmas over-expression in rat GH/PRL-secreting pituitary adenoma GH4C1 cells leads to an increase in cell viability and to a reduction in staurosporine-induced apoptosis and DNA fragmentation, in parallel with the increase in Magmas protein expression. These results indicate that Magmas plays a pivotal role in response to pro-apoptotic stimuli and confirm and extend the finding that Magmas protects pituitary cells from staurosporine-induced apoptosis, suggesting its possible involvement in pituitary adenoma development.
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Affiliation(s)
- Federico Tagliati
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Teresa Gagliano
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Erica Gentilin
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
- Laboratorio in rete del Tecnopolo “Tecnologie delle terapie avanzate” (LTTA) of the University of Ferrara, Ferrara, Italy
| | - Mariella Minoia
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Daniela Molè
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Ettore C. delgi Uberti
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
- Laboratorio in rete del Tecnopolo “Tecnologie delle terapie avanzate” (LTTA) of the University of Ferrara, Ferrara, Italy
| | - Maria Chiara Zatelli
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Ferrara, Italy
- Laboratorio in rete del Tecnopolo “Tecnologie delle terapie avanzate” (LTTA) of the University of Ferrara, Ferrara, Italy
- * E-mail:
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8
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Gagliano T, Bellio M, Gentilin E, Molè D, Tagliati F, Schiavon M, Cavallesco NG, Andriolo LG, Ambrosio MR, Rea F, Degli Uberti E, Zatelli MC. mTOR, p70S6K, AKT, and ERK1/2 levels predict sensitivity to mTOR and PI3K/mTOR inhibitors in human bronchial carcinoids. Endocr Relat Cancer 2013; 20:463-75. [PMID: 23653462 DOI: 10.1530/erc-13-0042] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bronchial carcinoids (BCs) are rare neuroendocrine tumors that are still orphans of medical treatment. Human BC primary cultures may display resistance to everolimus, an inhibitor of the mammalian target of rapamycin (mTOR), in terms of cell viability reduction. Our aim was to assess whether the novel dual phosphatidylinositol 3-kinase (PI3K)/mTOR inhibitor NVP-BEZ235 is effective in everolimus-resistant human BC tissues and cell lines. In addition, we searched for possible markers of the efficacy of mTOR inhibitors that may help in identifying the patients who may benefit from treatment with mTOR inhibitors, sparing them from ineffective therapy. We found that NVP-BEZ235 is twice as potent as everolimus in reducing cell viability and activating apoptosis in human BC tissues that display sensitivity to mTOR inhibitors, but is not effective in everolimus-resistant BC tissues and cell lines that bypass cyclin D1 downregulation and escape G0/G1 blockade. Rebound AKT activation was not observed in response to treatment with either mTOR inhibitor in the 'resistant' BC cells. In addition to total mTOR levels, putative markers of the sensitivity of BCs to mTOR inhibitors are represented by AKT, p70S6K (RPS6KB2), and ERK1/2 (MAPK3/1) protein levels. Finally, we validated these markers in an independent BC group. These data indicate that the dual PI3K/mTOR inhibitor NVP-BEZ235 is more potent than everolimus in reducing the proliferation of human BC cells. 'Resistant' cells display lower levels of mTOR, p70S6K, AKT, and ERK1/2, indicating that these proteins may be useful as predictive markers of resistance to mTOR and PI3K/mTOR inhibitors in human BCs.
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Affiliation(s)
- Teresa Gagliano
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Via Savonarola 9, Ferrara, Italy
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9
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Gentilin E, Tagliati F, Filieri C, Molè D, Minoia M, Rosaria Ambrosio M, Degli Uberti EC, Zatelli MC. miR-26a plays an important role in cell cycle regulation in ACTH-secreting pituitary adenomas by modulating protein kinase Cδ. Endocrinology 2013; 154:1690-700. [PMID: 23525216 PMCID: PMC3695590 DOI: 10.1210/en.2012-2070] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The functional aftermath of microRNA (miRNA) dysregulation in ACTH-secreting pituitary adenomas has not been demonstrated. miRNAs represent diagnostic and prognostic biomarkers as well as putative therapeutic targets; their investigation may shed light on the mechanisms that underpin pituitary adenoma development and progression. Drugs interacting with such pathways may help in achieving disease control also in the settings of ACTH-secreting pituitary adenomas. We investigated the expression of 10 miRNAs among those that were found as most dysregulated in human pituitary adenoma tissues in the settings of a murine ACTH-secreting pituitary adenoma cell line, AtT20/D16v-F2. The selected miRNAs to be submitted to further investigation in AtT20/D16v-F2 cells represent an expression panel including 5 up-regulated and 5 down-regulated miRNAs. Among these, we selected the most dysregulated mouse miRNA and searched for miRNA targets and their biological function. We found that AtT20/D16v-F2 cells have a specific miRNA expression profile and that miR-26a is the most dysregulated miRNA. The latter is overexpressed in human pituitary adenomas and can control viable cell number in the in vitro model without involving caspase 3/7-mediated apoptosis. We demonstrated that protein kinase Cδ (PRKCD) is a direct target of miR-26a and that miR26a inhibition delays the cell cycle in G1 phase. This effect involves down-regulation of cyclin E and cyclin A expression via PRKCD modulation. miR-26a and related pathways, such as PRKCD, play an important role in cell cycle control of ACTH pituitary cells, opening new therapeutic possibilities for the treatment of persistent/recurrent Cushing's disease.
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Affiliation(s)
- Erica Gentilin
- Section of Endocrinology, Department of Medical Sciences, University of Ferrara, Via Savonarola 9, 44100 Ferrara, Italy
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10
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Molè D, Gentilin E, Gagliano T, Tagliati F, Bondanelli M, Pelizzo MR, Rossi M, Filieri C, Pansini G, degli Uberti EC, Zatelli MC. Protein kinase C: a putative new target for the control of human medullary thyroid carcinoma cell proliferation in vitro. Endocrinology 2012; 153:2088-98. [PMID: 22374978 DOI: 10.1210/en.2011-1988] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We investigate the role of protein kinase C (PKC) in the control of medullary thyroid carcinoma (MTC) cell proliferation by a PKC inhibitor, Enzastaurin, in human MTC primary cultures and in the TT cell line. We found that PKC inhibition reduces cell proliferation by inducing caspase-mediated apoptosis and blocks the stimulatory effect of IGF-I on calcitonin secretion. Enzastaurin reduces PKCβII (Thr500) phosphorylation, indicating a direct involvement of this isoform as well as the phosphorylated levels of Akt (Ser 473) and glycogen synthase kinase (Ser9), PKC pathway downstream targets and pharmacodynamic markers for PKC inhibition. PKCβII and PKCδ enzyme isoforms expression and localization were investigated. These data indicate that in vitro PKC is involved in the control of human MTC proliferation and survival by modulating apoptosis, with a mechanism that implicates PKCβII inhibition and translocation in different subcellular compartments. Targeting PKC may represent a useful therapeutic approach for controlling MTC proliferation.
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Affiliation(s)
- Daniela Molè
- Section of Endocrinology, Department of Biomedical Sciences and Advanced Therapies, University of Ferrara, Via Savonarola 9, 44121 Ferrara, Italy
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11
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Gardner-Roehnelt NM. Update on the Management of Neuroendocrine Tumors: Focus on Somatostatin Antitumor Effects. Clin J Oncol Nurs 2012; 16:56-64. [DOI: 10.1188/12.cjon.56-64] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Molè D, Gagliano T, Gentilin E, Tagliati F, Pasquali C, Ambrosio MR, Pansini G, Degli Uberti EC, Zatelli MC. Targeting protein kinase C by Enzastaurin restrains proliferation and secretion in human pancreatic endocrine tumors. Endocr Relat Cancer 2011; 18:439-50. [PMID: 21606156 DOI: 10.1530/erc-11-0055] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Dysregulation of the protein kinase C (PKC) signaling pathway has been implicated in tumor progression. In this study, we investigate the effects of a PKC inhibitor, Enzastaurin, in human pancreatic neuroendocrine neoplasms (PNN) primary cultures and in the human pancreatic endocrine cancer cell line, BON1. To this aim six human PNN dispersed in primary cultures and BON1 cells were treated without or with 1-10 μM Enzastaurin and/or 100 nM IGF1 in the presence or absence of serum. Cell viability and apoptosis were evaluated after 48-72 h; Chromogranin A (CgA) and/or insulin secretion was assessed after 6 h of incubation. PKC expression was investigated by immunofluorescence and western blot. We found that Enzastaurin significantly reduced human PNN primary culture cell viability, as well as CgA and insulin secretion. Moreover, in the BON1 cell line Enzastaurin inhibited cell proliferation at 5 and 10 μM by inducing caspase-mediated apoptosis, and reduced phosphorylation of glycogen synthetase kinase 3β (GSK3β) and of Akt, both downstream targets of PKC pathway and pharmacodynamic markers for Enzastaurin. In addition, Enzastaurin blocked the stimulatory effect of IGF1 on cell proliferation, and reduced CgA expression and secretion in BON1 cells. Two different PKC isoforms are expressed at different levels and have partially different subcellular localization in BON1 cells. In conclusion, Enzastaurin reduces cell proliferation by inducing apoptosis, with a mechanism likely involving GSK3β signaling, and inhibits secretory activity in PNN in vitro models, suggesting that Enzastaurin might represent a possible medical treatment of human PNN.
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Affiliation(s)
- Daniela Molè
- Section of Endocrinology, Department of Biomedical Sciences and Advanced Therapies, University of Ferrara, Italy
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13
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Hasskarl J, Kaufmann M, Schmid HA. Somatostatin receptors in non-neuroendocrine malignancies: the potential role of somatostatin analogs in solid tumors. Future Oncol 2011; 7:895-913. [PMID: 21732759 DOI: 10.2217/fon.11.66] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Somatostatin receptors (sstrs) are G-protein-coupled receptors that mediate various physiological effects when activated by the neuropeptide somatostatin or its synthetic analogs. In addition to the well-documented antisecretory effects of sstr2-preferential somatostatin analogs octreotide and lanreotide, ligand binding to sstr initiates an inhibitory action on tumor growth. This effect may result from both indirect actions (suppression of growth factors and growth-promoting hormones [e.g., GH/IGF-1 axis] and inhibition of angiogenesis) and direct actions (activation of antigrowth activities [e.g., apoptosis]). As solid tumor cells express multiple sstrs, there is a rationale to evaluate the potential antitumor effects of pasireotide (SOM230), a multireceptor-targeted somatostatin analog with high binding affinity for sstr1–3 and sstr5. Pasireotide reduces systemic IGF-1 levels more potently than currently available somatostatin analogs and has been well tolerated in clinical trials.
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Affiliation(s)
| | - Martina Kaufmann
- Novartis Pharma AG, Forum 1, Novartis Campus, CH-4056 Basel, Switzerland
| | - Herbert A Schmid
- Novartis Pharma AG, Forum 1, Novartis Campus, CH-4056 Basel, Switzerland
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Khattak MNK, Buchfelder M, Kleindienst A, Schöfl C, Kremenevskaja N. CRH and SRIF have opposite effects on the Wnt/β-catenin signalling pathway through PKA/GSK-3β in corticotroph pituitary cells. Cancer Invest 2010; 28:797-805. [PMID: 20690801 DOI: 10.3109/07357907.2010.494318] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The Wnt/ß-catenin signalling pathway is involved in tumorigenesis including endocrine tumors. We investigated the Wnt/ß-catenin pathway's modulation by corticotropin-releasing hormone (CRH) and somatostatin or somatotropin release-inhibiting factor (SRIF) in mouse pituitary AtT-20 corticotroph cells. The Wnt/β-catenin signalling pathway was activated by CRH and inhibited by SRIF. We provide evidence that cAMP/PKA signalling is involved affecting the GSK-3β phosphorylation status at phospho-GSK-3β (Ser9), thereby altering β-catenin degradation downstream. Furthermore, CRH and SRIF showed concordant effects on cell proliferation. Our data demonstrate an important role of the Wnt/β-catenin pathway in the proliferative control of pituitary corticotroph cells and describe a mechanism for its regulation by CRH and SRIF.
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15
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Tumoral prostate shows different expression pattern of somatostatin receptor 2 (SSTR2) and phosphotyrosine phosphatase SHP-1 (PTPN6) according to tumor progression. Adv Urol 2009:723831. [PMID: 19365586 PMCID: PMC2667939 DOI: 10.1155/2009/723831] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Revised: 02/01/2009] [Accepted: 02/16/2009] [Indexed: 01/24/2023] Open
Abstract
Prostate proliferation is dependent of androgens and many peptide hormones. Recent reports suggest that SSTR2 and SHP-1 were two fundamental components on antiproliferative effect of somatostatin. Many studies on SHP-1 revealed that the expression of this protein was diminished or abolished in several of the cancer cell lines and tissues examined. However, it is necessary to confront the cell lines data with real situation in cancer cases. Our studies have shown that epithelial expressions of both proteins, SHP-1 and SSTR2, in normal and benign hyperplasia are localized in the luminal side of duct and acinar cells. Also, SSTR2 is expressed in stromal cells. In malignant prostate tissue, SHP-1 was diminished in 28/45 cases or absent in 12/45 cases, whereas SSTR2 epithelial was diminished in 38/45 cases or lost in only 2/45 cases. The intensity of immunostained was highly negative correlated with Gleason grade for two proteins.
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Barbieri F, Pattarozzi A, Gatti M, Porcile C, Bajetto A, Ferrari A, Culler MD, Florio T. Somatostatin receptors 1, 2, and 5 cooperate in the somatostatin inhibition of C6 glioma cell proliferation in vitro via a phosphotyrosine phosphatase-eta-dependent inhibition of extracellularly regulated kinase-1/2. Endocrinology 2008; 149:4736-46. [PMID: 18566118 DOI: 10.1210/en.2007-1762] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Somatostatin inhibits cell proliferation through the activation of five receptors (SSTR1-5) expressed in normal and cancer cells. We analyzed the role of individual SSTRs in the antiproliferative activity of somatostatin in C6 rat glioma cells. Somatostatin dose-dependently inhibited C6 proliferation, an effect mimicked, with different efficacy or potency, by BIM-23745, BIM-23120, BIM-23206 (agonists for SSTR1, -2, and -5) and octreotide. The activation of SSTR3 was ineffective, although all SSTRs are functionally active, as demonstrated by the inhibition of cAMP production. All SSTRs induced cytostatic effects through the activation of the phosphotyrosine phosphatase PTPeta and the inhibition of ERK1/2. For possible synergism between SSTR subtypes, we tested the effects of the combined treatment with two agonists (SSTR1+2 or SSTR2+5) or bifunctional compounds. The simultaneous activation of SSTR1 and SSTR2 slightly increased the efficacy of the individual compounds with an IC50 in between the single receptor activation. SSTR2+5 activation displayed a pattern of response superimposable to that of the SSTR5 agonist alone (low potency and higher efficacy, as compared with BIM-23120). The simultaneous activation of SSTR1, -2, and -5 resulted in a response similar to somatostatin. In conclusion, the cytostatic effects of somatostatin in C6 cells are mediated by the SSTR1, -2, and -5 through the same intracellular pathway: activation of PTPeta and inhibition of ERK1/2 activity. Somatostatin is more effective than the individual agonists. The combined activation of SSTR1 and -2 shows a partial synergism as far as antiproliferative activity, whereas SSTR2 and -5 activation results in a response resembling the SSTR5 effects.
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Affiliation(s)
- Federica Barbieri
- Laboratory pf Pharmacology, Department of Oncology, Biology, and Genetics, University of Genova, Viale Benedetto XV, 2, 16132 Genova, Italy
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Qiao LF, Xu YJ, Liu XS, Xie JG, Wang J, Du CL, Zhang J, Ni W, Chen SX. PKC promotes proliferation of airway smooth muscle cells by regulating cyclinD1 expression in asthmatic rats. Acta Pharmacol Sin 2008; 29:677-86. [PMID: 18501114 PMCID: PMC7091861 DOI: 10.1111/j.1745-7254.2008.00795.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Aim: To determine whether protein kinase C (PKC) has any effect on the expression of cyclinD1, a key regulator of growth control and G1/S transition, and to investigate the underlying molecular mechanisms of PKC involving the remodeling of the asthmatic airway smooth muscle (ASM). Methods: The treatment of synchronized ASM cells from asthmatic rats with PKC-specific agonist phorbol 12-myristate 13-acetate (PMA) and antagonist 2-{1-[3-(amidinothio) propyl]-1H-indol-3-yl}-3-(1-methylindol-3-yl) maleimide methanesulfonate salt (Ro31-8220) was followed by the proliferation assay. PKCα and cyclinD1 expressions in ASM cells (ASMC) were detected by RT-PCR and Western blotting. The relation between PKCα and cyclinD1 was assessed by linear regression analysis. The effect of the construct recombinant plasmid pcDNA3.1-antisense cyclinD1 (pcDNA3.1-ascyclinD1) on the proliferation of ASMC was found to be induced by PMA. Results: The data showed phorbol ester-dependent PKCα promoted the proliferation of ASMC. The closely-positive correlation existed between the expression of PKCα and cyclinD1 at the transcriptional (r=0.821, P<0.01) and transla-tional (r=0.940, P<0.01) levels. pcDNA3.1-ascyclinD1 could inhibit the proliferation of ASMC. pcDNA3.1-ascyclinD1 almost completely attenuated the PMA-induced proliferation effect as Ro31-8220+pcDNA3.1. Conclusion: The proliferation of ASMC by PKC might by regulated by the cyclinD1 expression in asthmatic rats.
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Affiliation(s)
- Li-fen Qiao
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Yong-jian Xu
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Xian-sheng Liu
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Jun-gang Xie
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Jin Wang
- Department of Emergency Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Chun-ling Du
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Jian Zhang
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Wang Ni
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Shi-xin Chen
- Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan, 430030 China
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18
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Cervia D, Bagnoli P. An update on somatostatin receptor signaling in native systems and new insights on their pathophysiology. Pharmacol Ther 2007; 116:322-41. [PMID: 17719647 DOI: 10.1016/j.pharmthera.2007.06.010] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Accepted: 06/28/2007] [Indexed: 12/20/2022]
Abstract
The peptide somatostatin (SRIF) has important physiological effects, mostly inhibitory, which have formed the basis for the clinical use of SRIF compounds. SRIF binding to its 5 guanine nucleotide-binding proteins-coupled receptors leads to the modulation of multiple transduction pathways. However, our current understanding of signaling exerted by receptors endogenously expressed in different cells/tissues reflects a rather complicated picture. On the other hand, the complexity of SRIF receptor signaling in pathologies, including pituitary and nervous system diseases, may be studied not only as alternative intervention points for the modulation of SRIF function but also to exploit new chemical space for drug-like molecules.
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Affiliation(s)
- Davide Cervia
- Department of Environmental Sciences, University of Tuscia, largo dell'Università snc, blocco D, 01100 Viterbo, Italy.
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