Edelfosine Promotes Apoptosis in Androgen-Deprived Prostate Tumors by Increasing ATF3 and Inhibiting Androgen Receptor Activity
Edelfosine is a synthetic alkyl-lysophospholipid that possesses significant antitumor activity in several human tumor models. Here, we investigated the effects of edelfosine combined with androgen deprivation (AD) in LNCaP and VCaP human prostate cancer cells. This treatment regimen greatly decrease...
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Published in | Molecular cancer therapeutics Vol. 15; no. 6; pp. 1353 - 1363 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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01.06.2016
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Abstract | Edelfosine is a synthetic alkyl-lysophospholipid that possesses significant antitumor activity in several human tumor models. Here, we investigated the effects of edelfosine combined with androgen deprivation (AD) in LNCaP and VCaP human prostate cancer cells. This treatment regimen greatly decreased cell proliferation compared with single agent or AD alone, resulting in higher levels of apoptosis in LNCaP compared with VCaP cells. Edelfosine caused a dose-dependent decrease in AKT activity, but did not affect the expression of total AKT in either cell line. Furthermore, edelfosine treatment inhibited the expression of androgen receptor (AR) and was associated with an increase in activating transcription factor 3 (ATF3) expression levels, a stress response gene and a negative regulator of AR transactivation. ATF3 binds to AR after edelfosine + AD and represses the transcriptional activation of AR as demonstrated by PSA promoter studies. Knockdown of ATF3 using siRNA-ATF3 reversed the inhibition of PSA promoter activity, suggesting that the growth inhibition effect of edelfosine was ATF3 dependent. Moreover, expression of AR variant 7 (ARv7) and TMPRSS2-ERG fusion gene were greatly inhibited after combined treatment with AD and edelfosine in VCaP cells. In vivo experiments using an orthotopic LNCaP model confirmed the antitumor effects of edelfosine + AD over the individual treatments. A significant decrease in tumor volume and PSA levels was observed when edelfosine and AD were combined, compared with edelfosine alone. Edelfosine shows promise in combination with AD for the treatment of prostate cancer patients. Mol Cancer Ther; 15(6); 1353-63. ©2016 AACR. |
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AbstractList | Edelfosine is a synthetic alkyl-lysophospholipid (ALP) that possesses significant antitumor activity in several human tumor models. Here, we investigated the effects of edelfosine combined with androgen deprivation (AD) in LNCaP and VCaP human prostate cancer cells. This treatment regimen greatly decreased cell proliferation compared to single agent or AD alone resulting in higher levels of apoptosis in LNCaP compared to VCaP cells. Edelfosine caused a dose-dependent decrease in AKT activity, but did not affect the expression of total AKT in either cell line. Furthermore, edelfosine treatment inhibited the expression of androgen receptor (AR) and was associated with an increase in activating transcription factor 3 (ATF3) expression levels, a stress response gene and a negative regulator of AR transactivation. ATF3 binds to AR after edelfosine + AD and represses the transcriptional activation of AR as demonstrated by prostate specific antigen (PSA) promoter studies. Knockdown of ATF3 using siRNA-ATF3 reversed the inhibition of PSA promoter activity, suggesting that the growth inhibition effect of edelfosine was ATF3 dependent. Moreover, expression of AR variant 7 (ARv7) and TMPRSS2-ERG fusion gene were greatly inhibited after combined treatment with AD and edelfosine in VCaP cells.
In vivo
experiments using an orthotopic LNCaP model confirmed the anti-tumor effects of edelfosine + AD over the individual treatments. A significant decrease in tumor volume and PSA levels were observed when edelfosine and AD were combined, compared to edelfosine alone. Edelfosine shows promise in combination with AD for the treatment of prostate cancer patients. Edelfosine is a synthetic alkyl-lysophospholipid that possesses significant antitumor activity in several human tumor models. Here, we investigated the effects of edelfosine combined with androgen deprivation (AD) in LNCaP and VCaP human prostate cancer cells. This treatment regimen greatly decreased cell proliferation compared with single agent or AD alone, resulting in higher levels of apoptosis in LNCaP compared with VCaP cells. Edelfosine caused a dose-dependent decrease in AKT activity, but did not affect the expression of total AKT in either cell line. Furthermore, edelfosine treatment inhibited the expression of androgen receptor (AR) and was associated with an increase in activating transcription factor 3 (ATF3) expression levels, a stress response gene and a negative regulator of AR transactivation. ATF3 binds to AR after edelfosine + AD and represses the transcriptional activation of AR as demonstrated by PSA promoter studies. Knockdown of ATF3 using siRNA-ATF3 reversed the inhibition of PSA promoter activity, suggesting that the growth inhibition effect of edelfosine was ATF3 dependent. Moreover, expression of AR variant 7 (ARv7) and TMPRSS2-ERG fusion gene were greatly inhibited after combined treatment with AD and edelfosine in VCaP cells. In vivo experiments using an orthotopic LNCaP model confirmed the antitumor effects of edelfosine + AD over the individual treatments. A significant decrease in tumor volume and PSA levels was observed when edelfosine and AD were combined, compared with edelfosine alone. Edelfosine shows promise in combination with AD for the treatment of prostate cancer patients. Mol Cancer Ther; 15(6); 1353-63. ©2016 AACR. |
Author | Udayakumar, Thirupandiyur S Philip, Sakhi Stoyanova, Radka Burnstein, Kerry L Pollack, Alan Shareef, Mohammed M Mu, Zhaomei |
AuthorAffiliation | 1 Department of Radiation Oncology, Sylvester Cancer Center, Miller School of Medicine, University of Miami, Miami, FL 3 Department of Molecular and Cellular Pharmacology, University of Miami, Miami, FL 2 Department of Medical Oncology, Thomas Jefferson University, Philadelphia, PA |
AuthorAffiliation_xml | – name: 3 Department of Molecular and Cellular Pharmacology, University of Miami, Miami, FL – name: 1 Department of Radiation Oncology, Sylvester Cancer Center, Miller School of Medicine, University of Miami, Miami, FL – name: 2 Department of Medical Oncology, Thomas Jefferson University, Philadelphia, PA |
Author_xml | – sequence: 1 givenname: Thirupandiyur S surname: Udayakumar fullname: Udayakumar, Thirupandiyur S organization: Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida – sequence: 2 givenname: Radka surname: Stoyanova fullname: Stoyanova, Radka organization: Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida – sequence: 3 givenname: Mohammed M surname: Shareef fullname: Shareef, Mohammed M organization: Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida – sequence: 4 givenname: Zhaomei surname: Mu fullname: Mu, Zhaomei organization: Department of Medical Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania – sequence: 5 givenname: Sakhi surname: Philip fullname: Philip, Sakhi organization: Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida – sequence: 6 givenname: Kerry L surname: Burnstein fullname: Burnstein, Kerry L organization: Department of Molecular and Cellular Pharmacology, University of Miami, Miami, Florida – sequence: 7 givenname: Alan surname: Pollack fullname: Pollack, Alan email: apollack@med.miami.edu organization: Department of Radiation Oncology, Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida. apollack@med.miami.edu |
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CitedBy_id | crossref_primary_10_1158_1541_7786_MCR_19_0836 crossref_primary_10_1021_acs_biochem_8b00712 crossref_primary_10_1186_s12964_020_00576_z crossref_primary_10_1016_j_ijbiomac_2018_08_107 crossref_primary_10_1017_erm_2017_11 crossref_primary_10_12677_ACM_2023_133413 crossref_primary_10_3389_fendo_2020_00556 crossref_primary_10_1016_j_biopha_2023_115436 crossref_primary_10_1002_pros_23828 crossref_primary_10_4103_1673_5374_251335 crossref_primary_10_1038_s41391_020_0217_3 crossref_primary_10_3390_pharmaceutics12070688 crossref_primary_10_1016_j_bmc_2022_117089 |
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Snippet | Edelfosine is a synthetic alkyl-lysophospholipid that possesses significant antitumor activity in several human tumor models. Here, we investigated the effects... Edelfosine is a synthetic alkyl-lysophospholipid (ALP) that possesses significant antitumor activity in several human tumor models. Here, we investigated the... |
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SubjectTerms | Activating Transcription Factor 3 - metabolism Androgen Antagonists - administration & dosage Androgen Antagonists - pharmacology Animals Apoptosis Cell Line, Tumor Cell Proliferation - drug effects Cell Survival - drug effects Drug Synergism Gene Expression Regulation, Neoplastic - drug effects Humans Male Mice Neoplasm Transplantation Phospholipid Ethers - administration & dosage Phospholipid Ethers - pharmacology Promoter Regions, Genetic - drug effects Prostatic Neoplasms - drug therapy Prostatic Neoplasms - genetics Prostatic Neoplasms - metabolism Proto-Oncogene Proteins c-akt - metabolism Receptors, Androgen - genetics Receptors, Androgen - metabolism Signal Transduction - drug effects Up-Regulation Xenograft Model Antitumor Assays |
Title | Edelfosine Promotes Apoptosis in Androgen-Deprived Prostate Tumors by Increasing ATF3 and Inhibiting Androgen Receptor Activity |
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