1
|
Tseng CY, Fu YH, Ou DL, Lu JW, Hou HA, Lin LI. Anti-leukemia effects of omipalisib in acute myeloid leukemia: inhibition of PI3K/AKT/mTOR signaling and suppression of mitochondrial biogenesis. Cancer Gene Ther 2023; 30:1691-1701. [PMID: 37821641 DOI: 10.1038/s41417-023-00675-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 09/05/2023] [Accepted: 09/29/2023] [Indexed: 10/13/2023]
Abstract
Omipalisib (GSK2126458), a potent dual PI3K/mTOR inhibitor, is reported to exhibit anti-tumor effect in several kinds of cancers. More than 50% of acute myeloid leukemia (AML) patients display a hyperactivation of PI3K/AKT/mTOR signaling. We investigated the anti-proliferative effect of omipalisib in AML cell lines with varied genetic backgrounds. The OCI-AML3 and THP-1 cell lines had a significant response to omipalisib, with IC50 values of 17.45 nM and 8.93 nM, respectively. We integrated transcriptomic profile and metabolomic analyses, and followed by gene set enrichment analysis (GSEA) and metabolite enrichment analysis. Our findings showed that in addition to inhibiting PI3K/AKT/mTOR signaling and inducing cell cycle arrest at the G0/G1 phase, omipalisib also suppressed mitochondrial respiration and biogenesis. Furthermore, omipalisib downregulated several genes associated with serine, glycine, threonine, and glutathione metabolism, and decreased their protein and glutathione levels. In vivo experiments revealed that omipalisib significantly inhibited tumor growth and prolonged mouse survival without weight loss. Gedatolisib and dactolisib, another two PI3K/mTOR inhibitors, exerted similar effects without affecting mitochondria biogenesis. These results highlight the multifaceted anti-leukemic effect of omipalisib, revealing its potential as a novel therapeutic agent in AML treatment.
Collapse
Affiliation(s)
- Chi-Yang Tseng
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Yu-Hsuan Fu
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Da-Liang Ou
- Graduate Institute of Oncology, National Taiwan University, Taipei, Taiwan
| | - Jeng-Wei Lu
- Biotech Research and Innovation Centre, University of Copenhagen, Copenhagen, 2200, Denmark
- The Finsen Laboratory, Rigs Hospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, 2200, Denmark
| | - Hsin-An Hou
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Liang-In Lin
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University, Taipei, Taiwan.
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan.
| |
Collapse
|
2
|
Ye Y, Huang Z, Zhang M, Li J, Zhang Y, Lou C. Synergistic therapeutic potential of alpelisib in cancers (excluding breast cancer): Preclinical and clinical evidences. Biomed Pharmacother 2023; 159:114183. [PMID: 36641927 DOI: 10.1016/j.biopha.2022.114183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/19/2022] [Accepted: 12/28/2022] [Indexed: 01/15/2023] Open
Abstract
The phosphoinositide 3-kinase (PI3K) signaling pathway is well-known for its important role in cancer growth, proliferation and migration. The activation of PI3K pathway is always connected with endocrine resistance and poor prognosis in cancers. Alpelisib, a selective inhibitor of PI3K, has been demonstrated to be effective in combination with endocrine therapy in HR+ PIK3CA-mutated advanced breast cancer in preclinical and clinical trials. Recently, the synergistic effects of alpelisib combined with targeted agents have been widely reported in PIK3CA-mutated cancer cells, such as breast, head and neck squamous cell carcinoma (HNSCC), cervical, liver, pancreatic and lung cancer. However, previous reviews mainly focused on the pharmacological activities of alpelisib in breast cancer. The synergistic therapeutic potential of alpelisib in other cancers has not yet been well reviewed. In this review, an extensive study of related literatures (published until December 20, 2022) regarding the anti-cancer functions and synergistic effects of alpelisib was carried out through the databases. Useful information was extracted. We summarized the preclinical and clinical studies of alpelisib in combination with targeted anti-cancer agents in cancer treatment (excluding breast cancer). The combinations of alpelisib and other targeted agents significantly improved the therapeutic efficacy both in preclinical and clinical studies. Unfortunately, synergistic therapies still could not effectively avoid the possible toxicities and adverse events during treatment. Finally, some prospects for the combination studies in cancer treatment were provided in the paper. Taken together, this review provided valuable information for alpelisib in preclinical and clinical applications.
Collapse
Affiliation(s)
- Yuhao Ye
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Zhiyu Huang
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Maoqing Zhang
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Jiayue Li
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Yiqiong Zhang
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| | - Chenghua Lou
- School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China.
| |
Collapse
|
3
|
Rasti AR, Guimaraes-Young A, Datko F, Borges VF, Aisner DL, Shagisultanova E. PIK3CA Mutations Drive Therapeutic Resistance in Human Epidermal Growth Factor Receptor 2-Positive Breast Cancer. JCO Precis Oncol 2022; 6:e2100370. [PMID: 35357905 PMCID: PMC8984255 DOI: 10.1200/po.21.00370] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 11/17/2021] [Accepted: 02/15/2022] [Indexed: 12/21/2022] Open
Abstract
The phosphatidylinositol 3-kinase (PI3K) pathway is an intracellular pathway activated in response to progrowth signaling, such as human epidermal growth factor receptor 2 (HER2) and other kinases. Abnormal activation of PI3K has long been recognized as one of the main oncogenic drivers in breast cancer, including HER2-positive (HER2+) subtype. Somatic activating mutations in the gene encoding PI3K alpha catalytic subunit (PIK3CA) are present in approximately 30% of early-stage HER2+ tumors and drive therapeutic resistance to multiple HER2-targeted agents. Here, we review currently available agents targeting PI3K, discuss their potential role in HER2+ breast cancer, and provide an overview of ongoing trials of PI3K inhibitors in HER2+ disease. Additionally, we review the landscape of PIK3CA mutational testing and highlight the gaps in knowledge that could present potential barriers in the effective application of PI3K inhibitors for treatment of HER2+ breast cancer.
Collapse
Affiliation(s)
| | - Amy Guimaraes-Young
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Farrah Datko
- University of Colorado Health Cancer Center, Harmony Campus, Fort Collins, CO
| | - Virginia F. Borges
- Young Women Breast Cancer Translational Program, University of Colorado Cancer Center, Aurora, CO
| | - Dara L. Aisner
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Elena Shagisultanova
- Young Women Breast Cancer Translational Program, University of Colorado Cancer Center, Aurora, CO
| |
Collapse
|
4
|
Inhibitory effects of Tomivosertib in acute myeloid leukemia. Oncotarget 2021; 12:955-966. [PMID: 34012509 PMCID: PMC8121614 DOI: 10.18632/oncotarget.27952] [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: 02/23/2021] [Accepted: 04/19/2021] [Indexed: 12/26/2022] Open
Abstract
The MAPK-interacting kinases 1 and 2 (MNK1/2) have generated increasing interest as therapeutic targets for acute myeloid leukemia (AML). We evaluated the therapeutic potential of the highly-selective MNK1/2 inhibitor Tomivosertib on AML cells. Tomivosertib was highly effective at blocking eIF4E phosphorylation on serine 209 in AML cells. Such inhibitory effects correlated with dose-dependent suppression of cellular viability and leukemic progenitor colony formation. Moreover, combination of Tomivosertib and Venetoclax resulted in synergistic anti-leukemic responses in AML cell lines. Mass spectrometry studies identified novel putative MNK1/2 interactors, while in parallel studies we demonstrated that MNK2 - RAPTOR - mTOR complexes are not disrupted by Tomivosertib. Overall, these findings demonstrate that Tomivosertib exhibits potent anti-leukemic properties on AML cells and support the development of clinical translational efforts involving the use of this drug, alone or in combination with other therapies for the treatment of AML.
Collapse
|
5
|
Kosciuczuk EM, Kar AK, Blyth GT, Fischietti M, Abedin S, Mina AA, Siliezar R, Rzymski T, Brzozka K, Eklund EA, Beauchamp EM, Eckerdt F, Saleiro D, Platanias LC. Inhibitory effects of SEL201 in acute myeloid leukemia. Oncotarget 2019; 10:7112-7121. [PMID: 31903169 PMCID: PMC6935253 DOI: 10.18632/oncotarget.27388] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 12/02/2019] [Indexed: 12/30/2022] Open
Abstract
MAPK interacting kinase (MNK), a downstream effector of mitogen-activated protein kinase (MAPK) pathways, activates eukaryotic translation initiation factor 4E (eIF4E) and plays a key role in the mRNA translation of mitogenic and antiapoptotic genes in acute myeloid leukemia (AML) cells. We examined the antileukemic properties of a novel MNK inhibitor, SEL201. Our studies provide evidence that SEL201 suppresses eIF4E phosphorylation on Ser209 in AML cell lines and in primary patient-derived AML cells. Such effects lead to growth inhibitory effects and leukemic cell apoptosis, as well as suppression of leukemic progenitor colony formation. Combination of SEL201 with 5'-azacytidine or rapamycin results in synergistic inhibition of AML cell growth. Collectively, these results suggest that SEL201 has significant antileukemic activity and further underscore the relevance of the MNK pathway in leukemogenesis.
Collapse
Affiliation(s)
- Ewa M Kosciuczuk
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.,Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, USA
| | - Aroop K Kar
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology/Oncology/Stem Cell Transplantation, Department of Pediatrics, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Gavin T Blyth
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Mariafausta Fischietti
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Sameem Abedin
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.,Division of Hematology and Oncology Department of Medicine Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Alain A Mina
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Rebekah Siliezar
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA
| | | | | | - Elizabeth A Eklund
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.,Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, USA
| | - Elspeth M Beauchamp
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.,Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, USA
| | - Frank Eckerdt
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Department of Neurological Surgery, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Diana Saleiro
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Leonidas C Platanias
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois, USA.,Division of Hematology-Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA.,Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, USA
| |
Collapse
|
6
|
Mishra RK, Clutter MR, Blyth GT, Kosciuczuk EM, Blackburn AZ, Beauchamp EM, Schiltz GE, Platanias LC. Discovery of novel Mnk inhibitors using mutation-based induced-fit virtual high-throughput screening. Chem Biol Drug Des 2019; 94:1813-1823. [PMID: 31260185 DOI: 10.1111/cbdd.13585] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/17/2019] [Accepted: 06/24/2019] [Indexed: 12/24/2022]
Abstract
Mnk kinases (Mnk1 and 2) are downstream effectors of Map kinase pathways and regulate phosphorylation of eukaryotic initiation factor 4E. Engagement of the Mnk pathway is critical in acute myeloid leukemia (AML) leukemogenesis and Mnk inhibitors have potent antileukemic properties in vitro and in vivo, suggesting that targeting Mnk kinases may provide a novel approach for treating AML. Here, we report the development and application of a mutation-based induced-fit in silico screen to identify novel Mnk inhibitors. The Mnk1 structure was modeled by temporarily mutating an amino acid that obstructs the ATP-binding site in the Mnk1 crystal structure while carrying out docking simulations of known inhibitors. The hit compounds display activity in Mnk biochemical and cellular assays, including acute myeloid leukemia progenitors. This approach will enable further rational structure-based drug design of new Mnk inhibitors and potentially novel ways of therapeutically targeting this kinase.
Collapse
Affiliation(s)
- Rama K Mishra
- The Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL, USA.,Department of Pharmacology, Northwestern University, Chicago, IL, USA
| | - Matthew R Clutter
- Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, USA.,Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Department of Molecular Biosciences, Northwestern University, Evanston, IL, USA
| | - Gavin T Blyth
- Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Ewa M Kosciuczuk
- Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Division of Hematology-Oncology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, IL, USA
| | - Amy Z Blackburn
- Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Elspeth M Beauchamp
- Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Division of Hematology-Oncology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, IL, USA
| | - Gary E Schiltz
- The Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, IL, USA.,Department of Pharmacology, Northwestern University, Chicago, IL, USA.,Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA
| | - Leonidas C Platanias
- Robert H. Lurie Comprehensive Cancer Center, Chicago, IL, USA.,Division of Hematology/Oncology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,Division of Hematology-Oncology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, IL, USA
| |
Collapse
|
7
|
Identification and targeting of novel CDK9 complexes in acute myeloid leukemia. Blood 2018; 133:1171-1185. [PMID: 30587525 DOI: 10.1182/blood-2018-08-870089] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 12/07/2018] [Indexed: 01/09/2023] Open
Abstract
Aberrant activation of mTOR signaling in acute myeloid leukemia (AML) results in a survival advantage that promotes the malignant phenotype. To improve our understanding of factors that contribute to mammalian target of rapamycin (mTOR) signaling activation and identify novel therapeutic targets, we searched for unique interactors of mTOR complexes through proteomics analyses. We identify cyclin dependent kinase 9 (CDK9) as a novel binding partner of the mTOR complex scaffold protein, mLST8. Our studies demonstrate that CDK9 is present in distinct mTOR-like (CTOR) complexes in the cytoplasm and nucleus. In the nucleus, CDK9 binds to RAPTOR and mLST8, forming CTORC1, to promote transcription of genes important for leukemogenesis. In the cytoplasm, CDK9 binds to RICTOR, SIN1, and mLST8, forming CTORC2, and controls messenger RNA (mRNA) translation through phosphorylation of LARP1 and rpS6. Pharmacological targeting of CTORC complexes results in suppression of growth of primitive human AML progenitors in vitro and elicits strong antileukemic responses in AML xenografts in vivo.
Collapse
|
8
|
Orsini M, Morceau F, Dicato M, Diederich M. Autophagy as a pharmacological target in hematopoiesis and hematological disorders. Biochem Pharmacol 2018; 152:347-361. [PMID: 29656115 DOI: 10.1016/j.bcp.2018.04.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 04/10/2018] [Indexed: 12/14/2022]
Abstract
Autophagy is involved in many cellular processes, including cell homeostasis, cell death/survival balance and differentiation. Autophagy is essential for hematopoietic stem cell survival, quiescence, activation and differentiation. The deregulation of this process is associated with numerous hematological disorders and pathologies, including cancers. Thus, the use of autophagy modulators to induce or inhibit autophagy emerges as a potential therapeutic approach for treating these diseases and could be particularly interesting for differentiation therapy of leukemia cells. This review presents therapeutic strategies and pharmacological agents in the context of hematological disorders. The pros and cons of autophagy modulators in therapy will also be discussed.
Collapse
Affiliation(s)
- Marion Orsini
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg
| | - Franck Morceau
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg
| | - Mario Dicato
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg
| | - Marc Diederich
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
| |
Collapse
|
9
|
Tan P, Tiong IS, Fleming S, Pomilio G, Cummings N, Droogleever M, McManus J, Schwarer A, Catalano J, Patil S, Avery S, Spencer A, Wei A. The mTOR inhibitor everolimus in combination with azacitidine in patients with relapsed/refractory acute myeloid leukemia: a phase Ib/II study. Oncotarget 2016; 8:52269-52280. [PMID: 28881728 PMCID: PMC5581027 DOI: 10.18632/oncotarget.13699] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 11/20/2016] [Indexed: 12/11/2022] Open
Abstract
Therapeutic options are limited in relapsed/refractory acute myeloid leukemia (AML). We evaluated the maximum tolerated dose (MTD) and preliminary efficacy of mammalian target of rapamycin (mTOR) inhibitor, everolimus (days 5–21) in combination with azacitidine 75 mg/m2 subcutaneously (days 1–5 and 8–9 every 28 days) in 40 patients with relapsed (n = 27), primary refractory (n = 11) or elderly patients unfit for intensive chemotherapy (n = 2). MTD was not reached following everolimus dose escalation (2.5, 5 or 10 mg; n = 19) to the 10 mg dose level which was expanded (n = 21). Major adverse events (grade > 2) were mostly disease-related: neutropenia (73%), thrombocytopenia (67%), mucositis (24%) and febrile neutropenia (19%). Overall survival (OS) of the entire cohort was 8.5 months, and overall response rate (ORR; including CR/CRi/PR/MLFS) was 22.5%. Furthermore, a landmark analysis beyond cycle 1 revealed superior OS and ORR in patients receiving 2.5 mg everolimus with azoles, compared to those without azoles (median OS 12.8 vs. 6.0 months, P = 0.049, and ORR 50% vs. 16%, P = 0.056), potentially due to achievement of higher everolimus blood levels. This study demonstrates that everolimus in combination with azacitidine is tolerable, with promising clinical activity in advanced AML.
Collapse
Affiliation(s)
- Peter Tan
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia
| | - Ing Soo Tiong
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia.,Australian Centre for Blood Diseases, Monash University, Melbourne, Australia
| | - Shaun Fleming
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia
| | - Giovanna Pomilio
- Australian Centre for Blood Diseases, Monash University, Melbourne, Australia
| | - Nik Cummings
- Department of Pathology, Alfred Hospital, Melbourne, Australia
| | - Mark Droogleever
- Faculty of Medicine, University of Amsterdam, Amsterdam, The Netherlands
| | - Julie McManus
- Department of Pathology, Alfred Hospital, Melbourne, Australia
| | - Anthony Schwarer
- Eastern Health Clinical School, Monash University, Box Hill, Australia
| | - John Catalano
- Clinical Haematology, Frankston Hospital, Frankston, Australia
| | - Sushrut Patil
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia
| | - Sharon Avery
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia
| | - Andrew Spencer
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia.,Australian Centre for Blood Diseases, Monash University, Melbourne, Australia
| | - Andrew Wei
- Malignant Haematology and Stem Cell Transplantation Service, Alfred Hospital, Melbourne, Australia.,Australian Centre for Blood Diseases, Monash University, Melbourne, Australia
| |
Collapse
|
10
|
Ghosh J, Kapur R. Regulation of Hematopoietic Stem Cell Self-Renewal and Leukemia Maintenance by the PI3K-mTORC1 Pathway. CURRENT STEM CELL REPORTS 2016. [DOI: 10.1007/s40778-016-0067-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
11
|
Repurposing of nitroxoline as a potential anticancer agent against human prostate cancer: a crucial role on AMPK/mTOR signaling pathway and the interplay with Chk2 activation. Oncotarget 2016; 6:39806-20. [PMID: 26447757 PMCID: PMC4741862 DOI: 10.18632/oncotarget.5655] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 09/21/2015] [Indexed: 12/20/2022] Open
Abstract
Nitroxoline is an antibiotic by chelating Zn2+ and Fe2+ from biofilm matrix. In this study, nitroxoline induced G1 arrest of cell cycle and subsequent apoptosis in prostate cancer cells through ion chelating-independent pathway. It decreased protein levels of cyclin D1, Cdc25A and phosphorylated Rb, but activated AMP-activated protein kinase (AMPK), a cellular energy sensor and signal transducer, leading to inhibition of downstream mTOR-p70S6K signaling. Knockdown of AMPKα significantly rescued nitroxoline-induced inhibition of cyclin D1-Rb-Cdc25A axis indicating AMPK-dependent mechanism. However, cytoprotective autophagy was simultaneously evoked by nitroxoline. Comet assay and Western blot analysis demonstrated DNA damaging effect and activation of Chk2 other than Chk1 to nitroxoline action. Instead of serving as a DNA repair transducer, nitroxoline-mediated Chk2 activation was identified to function as a pro-apoptotic inducer. In conclusion, the data suggest that nitroxoline induces anticancer activity through AMPK-dependent inhibition of mTOR-p70S6K signaling pathway and cyclin D1-Rb-Cdc25A axis, leading to G1 arrest of cell cycle and apoptosis. AMPK-dependent activation of Chk2, at least partly, contributes to apoptosis. The data suggest the potential role of nitroxoline for therapeutic development against prostate cancers.
Collapse
|
12
|
Zwang NA, Zhang R, Germana S, Fan MY, Hastings WD, Cao A, Turka LA. Selective Sparing of Human Tregs by Pharmacologic Inhibitors of the Phosphatidylinositol 3-Kinase and MEK Pathways. Am J Transplant 2016; 16:2624-38. [PMID: 27017850 PMCID: PMC5007157 DOI: 10.1111/ajt.13805] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 02/29/2016] [Accepted: 03/20/2016] [Indexed: 01/25/2023]
Abstract
Phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase/extracellular signal-regulated (MEK) signaling are central to the survival and proliferation of many cell types. Multiple lines of investigation in murine models have shown that control of the PI3K pathway is particularly important for regulatory T cell (Treg) stability and function. PI3K and MEK inhibitors are being introduced into the clinic, and we hypothesized that pharmacologic inhibition of PI3K, and possibly MEK, in mixed cultures of human mononuclear cells would preferentially affect CD4(+) and CD8(+) lymphocytes compared with Tregs. We tested this hypothesis using four readouts: proliferation, activation, functional suppression, and signaling. Results showed that Tregs were less susceptible to inhibition by both δ and α isoform-specific PI3K inhibitors and by an MEK inhibitor compared with their conventional CD4(+) and CD8(+) counterparts. These studies suggest less functional reliance on PI3K and MEK signaling in Tregs compared with conventional CD4(+) and CD8(+) lymphocytes. Therefore, the PI3K and MEK pathways are attractive pharmacologic targets for transplantation and treatment of autoimmunity.
Collapse
Affiliation(s)
- N. A. Zwang
- Center for Transplantation Sciences, Massachusetts General Hospital, Boston, MA
- Massachusetts General Hospital/Brigham and Women’s Hospital Nephrology Joint Fellowship Program, Boston, MA
| | - R. Zhang
- Center for Transplantation Sciences, Massachusetts General Hospital, Boston, MA
| | - S. Germana
- Center for Transplantation Sciences, Massachusetts General Hospital, Boston, MA
| | - M. Y. Fan
- Center for Transplantation Sciences, Massachusetts General Hospital, Boston, MA
| | | | - A. Cao
- Novartis Pharmaceuticals, Cambridge, MA
| | - L. A. Turka
- Center for Transplantation Sciences, Massachusetts General Hospital, Boston, MA
| |
Collapse
|
13
|
Craps J, Joris V, De Jongh B, Sonveaux P, Horman S, Lengelé B, Bertrand L, Many MC, Colin IM, Gérard AC. Involvement of mTOR and Regulation by AMPK in Early Iodine Deficiency-Induced Thyroid Microvascular Activation. Endocrinology 2016; 157:2545-59. [PMID: 27035650 DOI: 10.1210/en.2015-1911] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Iodine deficiency (ID) induces TSH-independent microvascular activation in the thyroid via the reactive oxygen species/nitric oxide-hypoxia-inducible factor-1α/vascular endothelial growth factor (VEGF) pathway. We hypothesized the additional involvement of mammalian target of rapamycin (mTOR) as a positive regulator of this pathway and AMP-activated protein kinase (AMPK) as a negative feedback regulator to explain the transient nature of ID-induced microvascular changes under nonmalignant conditions. mTOR and AMPK involvement was investigated using an in vitro model (human thyrocytes in primary cultures) and 2 murine models of goitrogenesis (normal NMRI and RET-PTC mice [a papillary thyroid cancer model]). In NMRI mice, ID had no effect on the phosphorylation of ribosomal S6 kinase (p70S6K), a downstream target of mTOR. However, rapamycin inhibited ID-induced thyroid blood flow and VEGF protein expression. In the RET-PTC model, ID strongly increased the phosphorylation of p70S6K, whereas rapamycin completely inhibited the ID-induced increase in p70S6K phosphorylation, thyroid blood flow, and VEGF-A expression. In vitro, although ID increased p70S6K phosphorylation, the ID-stimulated hypoxia-inducible factor/VEGF pathway was inhibited by rapamycin. Activation of AMPK by metformin inhibited ID effects both in vivo and in vitro. In AMPK-α1 knockout mice, the ID-induced increase in thyroid blood flow and VEGF-A protein expression persisted throughout the treatment, whereas both parameters returned to control values in wild-type mice after 4 days of ID. In conclusion, mTOR is required for early ID-induced thyroid microvascular activation. AMPK negatively regulates this pathway, which may account for the transient nature of ID-induced TSH-independent vascular effects under benign conditions.
Collapse
Affiliation(s)
- J Craps
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - V Joris
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - B De Jongh
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - P Sonveaux
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - S Horman
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - B Lengelé
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - L Bertrand
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - M-C Many
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - I M Colin
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| | - A-C Gérard
- Pôle de Morphologie (J.C., B.D.J., B.L., M.-C.M., I.M.C., A.-C.G.), de Pharmacologie et Thérapeutique (V.J., P.S.), de Recherche Cardiovasculaire (S.H., L.B.), Institut de Recherche Expérimentale et Clinique, Laboratoire de Biologie Cellulaire, and Institut des Sciences de la Vie (A.-C.G.), Université Catholique de Louvain, Louvain-La-Neuve, Brussels 1200, Belgium
| |
Collapse
|
14
|
Dinner S, Platanias LC. Targeting the mTOR Pathway in Leukemia. J Cell Biochem 2016; 117:1745-52. [PMID: 27018341 DOI: 10.1002/jcb.25559] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 03/24/2016] [Indexed: 12/16/2022]
Abstract
Optimal function of multiple intracellular signaling pathways is essential for normal regulation of cellular transcription, translation, growth, proliferation, and survival. Dysregulation or aberrant activation of such cascades can lead to inappropriate cell survival and abnormal cell proliferation in leukemia. Successful treatment of chronic myeloid leukemia (CML) with tyrosine kinase inhibitors targeting the BCR-ABL fusion gene is a prime example of effectively inhibiting intracellular signaling cascades. However, even in these patients resistance can develop via emergence of mutations or feedback activation of other pathways that cause refractory disease. Constitutive activation of the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt)/mammalian target of rapamycin (mTOR) signaling pathway has been observed in different types of leukemia, including CML, acute myeloid leukemia, and acute lymphoblastic leukemia. Abnormal mTOR activity may contribute to chemotherapy resistance, while it may also be effectively targeted via molecular means and/or development of specific pharmacological inhibitors. This review discusses the role of PI3K/Akt/mTOR dysre-gulation in leukemia and summarizes the emergence of preliminary data for the development of novel therapeutic approaches. J. Cell. Biochem. 117: 1745-1752, 2016. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Shira Dinner
- Division of Hematology-Oncology, Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611
| | - Leonidas C Platanias
- Division of Hematology-Oncology, Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611.,Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, 60612
| |
Collapse
|