1
|
Falvo S, Santillo A, Di Fiore MM, Venditti M, Grillo G, Latino D, Baccari I, Petito G, Chieffi Baccari G. New Insights into D-Aspartate Signaling in Testicular Activity. Cells 2024; 13:1400. [PMID: 39195288 DOI: 10.3390/cells13161400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2024] [Revised: 08/19/2024] [Accepted: 08/20/2024] [Indexed: 08/29/2024] Open
Abstract
D-aspartate (D-Asp) is an amino acid found in high concentrations in the testis and pituitary gland. Increasing evidence suggests that D-Asp promotes spermatogenesis by activating testosterone production in the Leydig cells via LH release from the pituitary gland. In vitro studies indicate that D-Asp may also influence steroidogenesis and spermatogenesis through autocrine and paracrine signals. D-Asp enhances StAR and steroidogenic enzyme expressions, facilitating testicular cell proliferation via the GluR/ERK1/2 pathway. Moreover, it supports spermatogenesis by enhancing the mitochondrial function in spermatocytes, aiding in the metabolic shift during meiosis. Enhanced mitochondrial function, along with improved MAM stability and reduced ER stress, has been observed in Leydig and Sertoli cells treated with D-Asp, indicating potential benefits in steroidogenesis and spermatogenesis efficiency. Conversely, D-Asp exerts a notable anti-apoptotic effect in the testis via the AMPAR/AKT pathway, potentially mediated by antioxidant enzyme modulation to mitigate testicular oxidative stress. This review lays the groundwork for future investigations into the molecules promoting spermatogenesis by stimulating endogenous testosterone biosynthesis, with D-amino acids emerging as promising candidates.
Collapse
Affiliation(s)
- Sara Falvo
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Alessandra Santillo
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Maria Maddalena Di Fiore
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Massimo Venditti
- Department of Experimental Medicine, University of Campania 'Luigi Vanvitelli', 80138 Napoli, Italy
| | - Giulia Grillo
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Debora Latino
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Isabella Baccari
- Department of Experimental Medicine, University of Campania 'Luigi Vanvitelli', 80138 Napoli, Italy
| | - Giuseppe Petito
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| | - Gabriella Chieffi Baccari
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania 'Luigi Vanvitelli', 81100 Caserta, Italy
| |
Collapse
|
2
|
Soares S, Faria I, Aires F, Monteiro A, Pinto G, Sales MG, Correa-Duarte MA, Guerreiro SG, Fernandes R. Application of Gold Nanoparticles as Radiosensitizer for Metastatic Prostate Cancer Cell Lines. Int J Mol Sci 2023; 24:ijms24044122. [PMID: 36835538 PMCID: PMC9964626 DOI: 10.3390/ijms24044122] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/12/2023] [Accepted: 02/13/2023] [Indexed: 02/22/2023] Open
Abstract
More than 50% of all prostate cancer (PCa) patients are treated by radiotherapy (RT). Radioresistance and cancer recurrence are two consequences of the therapy and are related to dose heterogeneity and non-selectivity between normal and tumoral cells. Gold nanoparticles (AuNPs) could be used as potential radiosensitizers to overcome these therapeutic limitations of RT. This study assessed the biological interaction of different morphologies of AuNPs with ionizing radiation (IR) in PCa cells. To achieve that aim, three different amine-pegylated AuNPs were synthesized with distinct sizes and shapes (spherical, AuNPsp-PEG, star, AuNPst-PEG, and rods, AuNPr-PEG) and viability, injury and colony assays were used to analyze their biological effect on PCa cells (PC3, DU145, and LNCaP) when submitted to the accumulative fraction of RT. The combinatory effect of AuNPs with IR decreased cell viability and increased apoptosis compared to cells treated only with IR or untreated cells. Additionally, our results showed an increase in the sensitization enhancement ratio by cells treated with AuNPs and IR, and this effect is cell line dependent. Our findings support that the design of AuNPs modulated their cellular behavior and suggested that AuNPs could improve the RT efficacy in PCa cells.
Collapse
Affiliation(s)
- Sílvia Soares
- ICBAS—School of Medicine and Biomedical Sciences, University of Porto, 4050-313 Porto, Portugal
- FP-I3ID, FP-BHS, Universidade Fernando Pessoa (UFP), 4249-004 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal
- Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain
- CEB, Centre of Biological Engineering of Minho University, 4710-057 Braga, Portugal
- BioMark@ISEP/CEB—Center of Biological Engineering of Minho University, School of Engineering, Polytechnic Institute of Porto, 4249-015 Porto, Portugal
| | - Isabel Faria
- School of Health, Polytechnic of Porto, 4200-072 Porto, Portugal
| | - Fátima Aires
- Radiotherapy Service, São João Hospital Center, 4200-319 Porto, Portugal
| | - Armanda Monteiro
- Radiotherapy Service, São João Hospital Center, 4200-319 Porto, Portugal
| | - Gabriela Pinto
- Radiotherapy Service, São João Hospital Center, 4200-319 Porto, Portugal
| | - Maria Goreti Sales
- ICBAS—School of Medicine and Biomedical Sciences, University of Porto, 4050-313 Porto, Portugal
- CEB, Centre of Biological Engineering of Minho University, 4710-057 Braga, Portugal
- Biomark@UC/CEB—Centre of Biological Engineering of Minho University, Department of Chemical Engineering, Faculty of Sciences and Technology, Coimbra University, 3030-790 Coimbra, Portugal
| | - Miguel A. Correa-Duarte
- CINBIO, University of Vigo, 36310 Vigo, Spain
- Southern Galicia Institute of Health Research (IISGS), and Biomedical Research Networking Center for Mental Health (CIBERSAM), 36310 Madrid, Spain
| | - Susana G. Guerreiro
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal
- Institute of Molecular Pathology, Immunology of the University of Porto-IPATIMUP, 4200-465 Porto, Portugal
- Department of Biomedicine, Biochemistry Unit, Faculty of Medicine, University of Porto, 4200-319 Porto, Portugal
- Correspondence: (S.G.G.); (R.F.)
| | - Rúben Fernandes
- FP-I3ID, FP-BHS, Universidade Fernando Pessoa (UFP), 4249-004 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal
- Faculty of Health Sciences (FCS) & Hospital Escola Fernando Pessoa (HEFP), University Fernando Pessoa (UFP), 4249-004 Porto, Portugal
- Correspondence: (S.G.G.); (R.F.)
| |
Collapse
|
3
|
Radaic A, Joo NE, Jeong SH, Yoo SII, Kotov N, Kapila YL. Phosphatidylserine-Gold Nanoparticles (PS-AuNP) Induce Prostate and Breast Cancer Cell Apoptosis. Pharmaceutics 2021; 13:1094. [PMID: 34371784 PMCID: PMC8309069 DOI: 10.3390/pharmaceutics13071094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/09/2021] [Accepted: 07/14/2021] [Indexed: 02/01/2023] Open
Abstract
Prostate and breast cancer are the current leading causes of new cancer cases in males and females, respectively. Phosphatidylserine (PS) is an essential lipid that mediates macrophage efferocytosis and is dysregulated in tumors. Therefore, developing therapies that selectively restore PS may be a potential therapeutic approach for carcinogenesis. Among the nanomedicine strategies for delivering PS, biocompatible gold nanoparticles (AuNPs) have an extensive track record in biomedical applications. In this study, we synthesized biomimetic phosphatidylserine-caped gold nanoparticles (PS-AuNPs) and tested their anticancer potential in breast and prostate cancer cells in vitro. We found that both cell lines exhibited changes in cell morphology indicative of apoptosis. After evaluating for histone-associated DNA fragments, a hallmark of apoptosis, we found significant increases in DNA fragmentation upon PS-AuNP treatment compared to the control treatment. These findings demonstrate the use of phosphatidylserine coupled with gold nanoparticles as a potential treatment for prostate and breast cancer. To the best of our knowledge, this is the first time that a phosphatidylserine-capped AuNP has been examined for its therapeutic potential in cancer therapy.
Collapse
Affiliation(s)
- Allan Radaic
- Orofacial Sciences Department, School of Dentistry, University of California, San Francisco (UCSF), San Francisco, CA 94143, USA; (A.R.); (N.E.J.)
| | - Nam E. Joo
- Orofacial Sciences Department, School of Dentistry, University of California, San Francisco (UCSF), San Francisco, CA 94143, USA; (A.R.); (N.E.J.)
| | - Soo-Hwan Jeong
- Department of Chemical Engineering, Kyungpook National University, Daegu 41566, Korea;
| | - Seong-II Yoo
- Department of Polymer Engineering, Pukyong National University, Busan 608737, Korea;
| | - Nicholas Kotov
- Department of Chemical Engineering, College of Engineering, University of Michigan, Ann Arbor, MI 48109, USA;
| | - Yvonne L. Kapila
- Orofacial Sciences Department, School of Dentistry, University of California, San Francisco (UCSF), San Francisco, CA 94143, USA; (A.R.); (N.E.J.)
| |
Collapse
|
4
|
Foster K, Oyenihi O, Rademan S, Erhabor J, Matsabisa M, Barker J, Langat MK, Kendal-Smith A, Asemota H, Delgoda R. Selective cytotoxic and anti-metastatic activity in DU-145 prostate cancer cells induced by Annona muricata L. bark extract and phytochemical, annonacin. BMC Complement Med Ther 2020; 20:375. [PMID: 33302945 PMCID: PMC7727144 DOI: 10.1186/s12906-020-03130-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 10/22/2020] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Annona muricata L. was identified as a popular medicinal plant in treatment regimens among cancer patients in Jamaica by a previously conducted structured questionnaire. Ethnomedically used plant parts, were examined in this study against human prostate cancer cells for the first time and mechanisms of action elucidated for the most potent of them, along with the active phytochemical, annonacin. METHODS Nine extracts of varying polarity from the leaves and bark of A. muricata were assessed initially for cytotoxicity using the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay on PC-3 prostate cancer cells and the ethyl acetate bark (EAB) extract was identified as the most potent. EAB extract was then standardized for annonacin content using High-performance Liquid Chromatography - Mass Spectrometry (HPLC-MS) and shown to be effective against a second prostate cancer cell line (DU-145) also. The mode of cell death in DU-145 cells were assessed via several apoptotic assays including induction of increased reactive oxygen species (ROS) production, reduction of mitochondrial membrane potential, activation of caspases and annexin V externalization combined with morphological observations using confocal microscopy. In addition, the potential to prevent metastasis was examined via inhibition of cell migration, vascular endothelial growth factor (VEGF) and angiogenesis using the chorioallantoic membrane assay (CAM). RESULTS Annonacin and EAB extract displayed selective and potent cytotoxicity against the DU-145 prostate carcinoma cells with IC50 values of 0.1 ± 0.07 μM and 55.501 ± 0.55 μg/mL respectively, without impacting RWPE-1 normal prostate cells, in stark contrast to chemotherapeutic docetaxel which lacked such selectivity. Docetaxel's impact on the cancerous DU-145 was improved by 50% when used in combination with EAB extract. Insignificant levels of intracellular ROS content, depolarization of mitochondrial membrane, Caspase 3/7 activation, annexin V content, along with stained morphological evaluations, pointed to a non-apoptotic mode of cell death. The extract at 50 μg/mL deterred cell migration in the wound-healing assay, while inhibition of angiogenesis was displayed in the CAM and VEGF inhibition assays for both EAB (100 μg /mL) and annonacin (0.5 μM). CONCLUSIONS Taken together, the standardized EAB extract and annonacin appear to induce selective and potent cell death via a necrotic pathway in DU-145 cells, while also preventing cell migration and angiogenesis, which warrant further examinations for mechanistic insights and validity in-vivo.
Collapse
Affiliation(s)
- Kimberley Foster
- Natural Products Institute, University of the West Indies, Mona, Kingston 7, Jamaica
- Biotechnolgy Centre, University of the West Indies, Mona, Kingston 7, Jamaica
| | - Omolola Oyenihi
- Pharmacology Department, School of Clinical Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Sunelle Rademan
- Pharmacology Department, School of Clinical Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Joseph Erhabor
- Pharmacology Department, School of Clinical Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Motlalepula Matsabisa
- Pharmacology Department, School of Clinical Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - James Barker
- School of Life Sciences, Pharmacy and Chemistry, Kingston University, Penrhyn Road, Kingston-upon-Thames, Surrey, UK
| | - Moses K Langat
- Jodrell Laboratory, Department of Natural Capital and Plant Health, Royal Botanic Gardens, Kew, Richmond, TW9 3DS, UK
| | - Amy Kendal-Smith
- Jodrell Laboratory, Department of Natural Capital and Plant Health, Royal Botanic Gardens, Kew, Richmond, TW9 3DS, UK
- Faculty of Biological Sciences, University of Leeds, Leeds, England
| | - Helen Asemota
- Biotechnolgy Centre, University of the West Indies, Mona, Kingston 7, Jamaica
| | - Rupika Delgoda
- Natural Products Institute, University of the West Indies, Mona, Kingston 7, Jamaica.
| |
Collapse
|
5
|
Marine alkaloid monanchoxymycalin C: a new specific activator of JNK1/2 kinase with anticancer properties. Sci Rep 2020; 10:13178. [PMID: 32764580 PMCID: PMC7411023 DOI: 10.1038/s41598-020-69751-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 07/16/2020] [Indexed: 12/22/2022] Open
Abstract
Monanchoxymycalin C (MomC) is a new marine pentacyclic guanidine alkaloid, recently isolated from marine sponge Monanchora pulchra by us. Here, anticancer activity and mechanism of action was investigated for the first time using a human prostate cancer (PCa) model. MomC was active in all PCa cell lines at low micromolar concentrations and induced an unusual caspase-independent, non-apoptotic cell death. Kinase activity screening identified activation of mitogen-activated protein kinase (MAPK) c-Jun N-terminal protein kinase (JNK1/2) to be one of the primary molecular mechanism of MomC anticancer activity. Functional assays demonstrated a specific and selective JNK1/2 activation prior to the induction of other cell death related processes. Inhibition of JNK1/2 by pretreatment with the JNK-inhibitor SP600125 antagonized cytotoxic activity of the marine compound. MomC caused an upregulation of cytotoxic ROS. However, in contrast to other ROS-inducing agents, co-treatment with PARP-inhibitor olaparib revealed antagonistic effects indicating an active PARP to be necessary for MomC activity. Interestingly, although no direct regulation of p38 and ERK1/2 were detected, active p38 kinase was required for MomC efficacy, while the inhibition of ERK1/2 increased its cytotoxicity. In conclusion, MomC shows promising activity against PCa, which is exerted via JNK1/2 activation and non-apoptotic cell death.
Collapse
|
6
|
The role of JNK in prostate cancer progression and therapeutic strategies. Biomed Pharmacother 2020; 121:109679. [DOI: 10.1016/j.biopha.2019.109679] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 11/10/2019] [Accepted: 11/16/2019] [Indexed: 12/31/2022] Open
|
7
|
Kawan MA, Kyrou I, Ramanjaneya M, Williams K, Jeyaneethi J, Randeva HS, Karteris E. Involvement of the glutamine RF‑amide peptide and its cognate receptor GPR103 in prostate cancer. Oncol Rep 2018; 41:1140-1150. [PMID: 30483810 PMCID: PMC6313030 DOI: 10.3892/or.2018.6893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 07/10/2018] [Indexed: 01/10/2023] Open
Abstract
Glutamine RF‑amide peptide (QRFP) belongs to the RFamide neuropeptide family, which is involved in a wide spectrum of biological activities, ranging from food intake and cardiovascular functioning to analgesia, aldosterone secretion, locomotor activity and reproduction. Recently, QRFP has been demonstrated to exert its effects by activating the G protein‑coupled receptor GPR103. QRFP is expressed in the brain and peripherally in the adipose tissue, bladder, colon, testis, parathyroid and thyroid gland, as well as in the prostate gland. Following lung cancer, prostate cancer constitutes the second most frequently diagnosed cancer among men, whilst obesity appears to be a contributing factor for aggressive prostate cancer. In the present study, we sought to investigate the role of QRFP in prostate cancer, using two androgen‑independent human prostate cancer cell lines (PC3 and DU145) as in vitro experimental models and clinical human prostate cancer samples. The expression of both QRFP and GPR103 at the gene and protein level was higher in human prostate cancer tissue samples compared to control and benign prostatic hyperplasia (BHP) samples. Furthermore, in both prostate cancer cell lines used in the present study, QRFP treatment induced the phosphorylation of ERK1/2, p38, JNK and Akt. In addition, QRFP increased cell migration and invasion in these in vitro models, with the increased expression of MMP2. Furthermore, we demonstrated that the pleiotropic adipokine, leptin, increased the expression of QRFP and GPR103 in PC3 prostate cancer cells via a PI3K‑ and MAPK‑dependent mechanism, indicating a novel potential link between adiposity and prostate cancer. Our findings expand the existing evidence and provide novel insight into the implication of QRFP in prostate cancer.
Collapse
Affiliation(s)
- Mohamed Ab Kawan
- Translational and Experimental Medicine, Clinical Sciences Research Institute, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Ioannis Kyrou
- Translational and Experimental Medicine, Clinical Sciences Research Institute, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Manjunath Ramanjaneya
- Translational and Experimental Medicine, Clinical Sciences Research Institute, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Kevin Williams
- Department of Urology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry CV2 2DX, UK
| | - Jeyarooban Jeyaneethi
- Biosciences, Department of Life Sciences, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
| | - Harpal S Randeva
- Translational and Experimental Medicine, Clinical Sciences Research Institute, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Emmanouil Karteris
- Biosciences, Department of Life Sciences, Brunel University, Uxbridge, Middlesex UB8 3PH, UK
| |
Collapse
|
8
|
ΔNp63α is a common inhibitory target in oncogenic PI3K/Ras/Her2-induced cell motility and tumor metastasis. Proc Natl Acad Sci U S A 2017; 114:E3964-E3973. [PMID: 28468801 DOI: 10.1073/pnas.1617816114] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Activation of phosphatidylinositol 3 kinase (PI3K), Ras, and Her2 signaling plays a critical role in cancer development. Hotspot constitutive activating mutations in oncogenes, such as PIK3CA encoding the p110α catalytic subunit or RAS, as well as overexpression of Her2, are frequently found in human tumors and cancers. It has been well established that activation of these oncogenes profoundly promotes tumor metastasis, whereas decreased expression of ΔNp63α, the major protein isoform of the p53-related p63 expressed in epithelial cells, has been associated with cancer metastasis. In this study, we demonstrate that hotspot oncogenic mutations on PIK3CA and RAS, including p110αH1047R, K-RasG12V, and H-RasG12V, as well as activation of Her2, all led to suppression of ΔNp63α expression via Akt-fork-head transcription factor 3a (Akt-FOXO3a) signaling, resulting in increased cell motility and tumor metastasis. Expression of ΔNp63α effectively reversed p110αH1047R-, K-RasG12V-, H-RasG12V-, or Her2-induced cell motility in vitro and tumor metastasis in mouse models. We show that ΔNp63α was a direct FOXO3a transcriptional target and that expression of FOXO3a and ΔNp63α was correlated in human cancer biopsy samples. Together, these results demonstrate that ΔNp63α is a common inhibitory target of oncogenic PI3K, Ras, and Her2, and that ΔNp63α may function as a critical integrator of oncogenic signaling in cancer metastasis.
Collapse
|
9
|
Puto LA, Brognard J, Hunter T. Transcriptional Repressor DAXX Promotes Prostate Cancer Tumorigenicity via Suppression of Autophagy. J Biol Chem 2015; 290:15406-15420. [PMID: 25903140 PMCID: PMC4505457 DOI: 10.1074/jbc.m115.658765] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Indexed: 12/20/2022] Open
Abstract
The DAXX transcriptional repressor was originally associated with apoptotic cell death. However, recent evidence that DAXX represses several tumor suppressor genes, including the DAPK1 and DAPK3 protein kinases, and is up-regulated in many cancers argues that a pro-survival role may predominate in a cancer context. Here, we report that DAXX has potent growth-enhancing effects on primary prostatic malignancy through inhibition of autophagy. Through stable gene knockdown and mouse subcutaneous xenograft studies, we demonstrate that DAXX promotes tumorigenicity of human ALVA-31 and PC3 prostate cancer (PCa) cells in vivo. Importantly, DAXX represses expression of essential autophagy modulators DAPK3 and ULK1 in vivo, revealing autophagy suppression as a mechanism through which DAXX promotes PCa tumorigenicity. Furthermore, DAXX knockdown increases autophagic flux in cultured PCa cells. Finally, interrogation of the Oncomine(TM) database suggests that DAXX overexpression is associated with malignant transformation in several human cancers, including prostate and pancreatic cancers. Thus, DAXX may represent a new cancer biomarker for the detection of aggressive disease, whose tissue-specific down-regulation can serve as an improved therapeutic modality. Our results establish DAXX as a pro-survival protein in PCa and reveal that, in the early stages of tumorigenesis, autophagy suppresses prostate tumor formation.
Collapse
Affiliation(s)
- Lorena A Puto
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California 92037
| | - John Brognard
- Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, United Kingdom
| | - Tony Hunter
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, California 92037.
| |
Collapse
|
10
|
Cardoso HJ, Vaz CV, Correia S, Figueira MI, Marques R, Maia CJ, Socorro S. Paradoxical and contradictory effects of imatinib in two cell line models of hormone-refractory prostate cancer. Prostate 2015; 75:923-35. [PMID: 25786656 DOI: 10.1002/pros.22976] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 01/13/2015] [Indexed: 01/26/2023]
Abstract
BACKGROUND Imatinib mesylate is a chemotherapeutic drug that inhibits the tyrosine kinase activity of c-KIT and has been successfully used to treat leukemias and some solid tumors. However, its application for treatment of hormone-refractory prostate cancer (HRPC) has shown modest effectiveness and did not follow the outcomes in cultured cells or animal models. Moreover, the molecular pathways by which imatinib induces cytotoxicity in prostate cancer cells are poorly characterized. METHODS Two cell line models of HRPC (DU145 and PC3) were exposed to 20 μM of imatinib for 6-72 hr. MTS assay was used to assess cell viability during the course of experiment. Gene expression analysis of c-KIT, cell-cycle and apoptosis regulators, and angiogenic factors was determined by means of real-time PCR, western blot, and/or immunocytochemistry. The enzymatic activity of the apoptosis effector, caspase-3, was determined by a colorimetric assay. RESULTS Imatinib significantly decreased the viability of DU145 cells but paradoxically augmented the viability of PC3 cells. DU145 cells displayed diminished expression of anti-apoptotic Bcl-2 protein and augmented levels of caspase-8 and -9, as well as, increased enzymatic activity of caspase-3 in response to imatinib. No differences existed on the expression levels of apoptosis-related proteins in PC3 cells treated with imatinib, though the activity of caspase-3 was decreased. The mRNA levels of angiogenic factor VEGF were decreased in DU145-treated cells, whereas an opposite effect was seen in PC3. In addition, it was shown that DU145 and PC3 cells present a differential expression of c-KIT protein variants. CONCLUSION DU145 and PC3 cells displayed a contradictory behavior in response to imatinib, which was underpinned by a distinct expression pattern (or activity) of target regulators of cell-cycle, apoptosis, and angiogenesis. The paradoxical effect of imatinib in PC3 cells may be related with the differential expression of c-KIT protein variants. Moreover, the present findings helped to understand the discrepancies in the efficacy of imatinib as therapeutic option in HRPC.
Collapse
Affiliation(s)
- Henrique J Cardoso
- CICS-UBI, Health Sciences Research Center, University of Beira Interior, Covilhã, Portugal
| | | | | | | | | | | | | |
Collapse
|
11
|
Dedov II, Smirnova OM, Gorelyshev AS. Stress of endoplasmic reticulum: the cytological "scenario" of pathogenesis of human diseases. ACTA ACUST UNITED AC 2012. [DOI: 10.14341/probl201258557-65] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The phenomenon of stress of endoplasmic reticulum (ER) attracts an increasingly higher attention of the researchers. The available data suggest that ER dysfunction is a common component of many human pathologies including oncological diseases and neurodegenerative viral diseases. Stress of ER is of special significance in the cell populations actively secreting proteins because protein folding disturbances play an important role in its development. This fact opens up prospects for the better understanding of pathogenesis of diabetes mellitus and some other diseases. The present work summarizes the current concepts of biochemical mechanisms underlying stress of endoplasmic reticulum and elucidates the key signal pathways for its compensation and proapoptosis.
Collapse
|