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  1. Article: Hedgehog in prostate cancer explained.

    Buttyan, Ralph / Li, Na / Massah, Shabnam

    Oncoscience

    2018  Volume 5, Issue 3-4, Page(s) 67–68

    Language English
    Publishing date 2018-04-29
    Publishing country United States
    Document type Editorial
    ISSN 2331-4737
    ISSN 2331-4737
    DOI 10.18632/oncoscience.405
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Correction: Implications of PI3K/AKT inhibition on REST protein stability and neuroendocrine phenotype acquisition in prostate cancer cells.

    Chen, Ruiqi / Li, Yinan / Buttyan, Ralph / Dong, Xuesen

    Oncotarget

    2018  Volume 9, Issue 51, Page(s) 29842

    Abstract: This corrects the article DOI: 10.18632/oncotarget.19386.]. ...

    Abstract [This corrects the article DOI: 10.18632/oncotarget.19386.].
    Language English
    Publishing date 2018-07-03
    Publishing country United States
    Document type Journal Article ; Published Erratum
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.25759
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Erythropoietin promotes functional recovery via anti-apoptotic mechanisms in mouse unilateral ureteral obstruction.

    Park, Elliya / Cox, Michael / Scotland, Kymora / Buttyan, Ralph / Lange, Dirk

    Cell stress & chaperones

    2020  Volume 25, Issue 2, Page(s) 245–251

    Abstract: The purpose of the work was to investigate mechanisms of erythropoietin-induced protection and accelerated recovery of kidneys and ureters from obstructive injury. Unilateral ureteral obstruction was established for 24, 48, and 72 h in C57BL/6 mice using ...

    Abstract The purpose of the work was to investigate mechanisms of erythropoietin-induced protection and accelerated recovery of kidneys and ureters from obstructive injury. Unilateral ureteral obstruction was established for 24, 48, and 72 h in C57BL/6 mice using a non-traumatic micro-clip followed by the microscopic quantification of ureteral peristalsis pre- and post-obstruction. Expression of erythropoietin, erythropoietin receptor, β-common receptor, and downstream apoptosis-related markers was assessed by RT-PCR and immunohistochemistry in ureters and kidneys and compared to the respective organs on the contralateral side within each animal. Expression of genes in kidneys and ureters from mice treated with 20 IU of erythropoietin daily for 72 h prior to obstruction was compared to that of untreated mice following obstruction. Apoptosis in ureteral tissues after 72-h obstruction was assessed via TUNEL assay. Ureteral obstruction increased apoptosis in affected ureters, with peristaltic function halted following all periods of obstruction. Erythropoietin treatment suppressed apoptosis in obstructed tissues and increased the percentage of mice retaining ureteral function immediately following obstruction reversal. Erythropoietin, erythropoietin receptor, Bcl-2, and Bcl-xl mRNA expression were down-regulated, while phospho-Nf-ĸb p65 was up-regulated in ureteral epithelia following obstruction. Erythropoietin treatment induced anti-apoptotic signaling via down-regulated Bax mRNA expression and abrogated phospho-Nf-ĸb p65. Erythropoietin-induced protection of ureteral function and accelerated recovery post-obstruction removal is mediated via anti-apoptotic mechanisms. Ureteral function is disrupted even following obstruction removal, negatively affecting renal function due to delayed recovery. Thus, our results represent a potential target for the development of safe therapeutic agents aimed at improving functional recovery from obstructive injury.
    MeSH term(s) Animals ; Apoptosis/drug effects ; Epoetin Alfa/administration & dosage ; Epoetin Alfa/pharmacology ; Female ; Kidney/drug effects ; Kidney/injuries ; Mice ; Mice, Inbred C57BL ; Protective Agents/administration & dosage ; Protective Agents/pharmacology ; Recovery of Function ; Ureter/drug effects ; Ureter/injuries ; Ureteral Obstruction/drug therapy
    Chemical Substances Protective Agents ; Epoetin Alfa (64FS3BFH5W)
    Language English
    Publishing date 2020-01-22
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1362749-1
    ISSN 1466-1268 ; 1355-8145
    ISSN (online) 1466-1268
    ISSN 1355-8145
    DOI 10.1007/s12192-020-01067-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Implications of PI3K/AKT inhibition on REST protein stability and neuroendocrine phenotype acquisition in prostate cancer cells.

    Chen, Ruiqi / Li, Yinan / Buttyan, Ralph / Dong, Xuesen

    Oncotarget

    2017  Volume 8, Issue 49, Page(s) 84863–84876

    Abstract: Treatment-induced neuroendocrine prostate cancer (t-NEPC) is an aggressive subtype of prostate cancer (PCa) that arises as a consequence of rigorous androgen receptor (AR) pathway inhibition (ARPI) therapies. While the PI3K/AKT pathway has been ... ...

    Abstract Treatment-induced neuroendocrine prostate cancer (t-NEPC) is an aggressive subtype of prostate cancer (PCa) that arises as a consequence of rigorous androgen receptor (AR) pathway inhibition (ARPI) therapies. While the PI3K/AKT pathway has been investigated as a co-therapeutic target with ARPI for advanced PCa, whether this strategy can prevent tumor progression to t-NEPC remains unknown. Here, we report that PI3K/AKT inhibition alone reduces RE-1 silencing transcription factor (REST) protein expression and induces multiple NE markers in PCa cells. The loss of REST by PI3K/AKT inhibition is through protein degradation mediated by the E3-ubiquitin ligase β-TRCP and REST phosphorylations at the S1024, S1027, and S1030 sites. Since AR inhibition can also deplete REST, the combinational inhibition of PI3K/AKT and AR further aggravated REST protein reduction. We profiled the transcriptomes of AKT and AR inhibitions in the LNCaP cells. The Gene Set Enrichment Analysis (GSEA) showed that these transcriptomes are highly correlated with the REST-regulated gene signature. Co-targeting AKT and AR resulted in a higher correlation comparing to those of single treatment. Comparing these transcriptomes to the t-NEPC gene signature in patients by GSEA, we observed that adding AKT inhibition to AR blockade enhanced the expression of neurogenesis-related genes and resulted in a stronger and broader upregulation of REST-regulated genes specific to t-NEPC. These results indicate that AKT pathway inhibition can induce neuroendocrine differentiation of PCa cells
    Language English
    Publishing date 2017-07-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.19386
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Semaphorin 3C promotes de novo steroidogenesis in prostate cancer cells.

    Yenki, Parvin / Bhasin, Satyam / Liu, Liang / Nabavi, Noushin / Cheng, Chi Wing / Tam, Kevin J / Peacock, James W / Adomat, Hans H / Tombe, Tabitha / Fazli, Ladan / Ivanova, Larissa / Dusek, Christopher / Khosravi, Shahram / Guns, Emma S Tomlinson / Wang, Yuzhuo / Buttyan, Ralph / Gleave, Martin E / Ong, Christopher J

    Endocrine-related cancer

    2023  Volume 30, Issue 12

    Abstract: Intratumoral androgen biosynthesis contributes to castration-resistant prostate cancer progression in patients treated with androgen deprivation therapy. The molecular mechanisms by which castration-resistant prostate cancer acquires the capacity for ... ...

    Abstract Intratumoral androgen biosynthesis contributes to castration-resistant prostate cancer progression in patients treated with androgen deprivation therapy. The molecular mechanisms by which castration-resistant prostate cancer acquires the capacity for androgen biosynthesis to bypass androgen deprivation therapy are not entirely known. Here, we show that semaphorin 3C, a secreted signaling protein that is highly expressed in castration-resistant prostate cancer, can promote steroidogenesis by altering the expression profile of key steroidogenic enzymes. Semaphorin 3C not only upregulates enzymes required for androgen synthesis from dehydroepiandrosterone or de novo from cholesterol but also simultaneously downregulates enzymes involved in the androgen inactivation pathway. These changes in gene expression correlate with increased production of androgens induced by semaphorin 3C in prostate cancer model cells. Moreover, semaphorin 3C upregulates androgen synthesis in LNCaP cell-derived xenograft tumors, likely contributing to the enhanced in vivo tumor growth rate post castration. Furthermore, semaphorin 3C activates sterol regulatory element-binding protein, a transcription factor that upregulates enzymes involved in the synthesis of cholesterol, a sole precursor for de novo steroidogenesis. The ability of semaphorin 3C to promote intratumoral androgen synthesis may be a key mechanism contributing to the reactivation of the androgen receptor pathway in castration-resistant prostate cancer, conferring continued growth under androgen deprivation therapy. These findings identify semaphorin 3C as a potential therapeutic target for suppressing intratumoral steroidogenesis.
    MeSH term(s) Male ; Humans ; Androgens/metabolism ; Prostatic Neoplasms, Castration-Resistant/metabolism ; Androgen Antagonists ; Receptors, Androgen/metabolism ; Cholesterol/metabolism ; Semaphorins/genetics ; Semaphorins/metabolism ; Cell Line, Tumor ; Gene Expression Regulation, Neoplastic
    Chemical Substances Androgens ; Androgen Antagonists ; Receptors, Androgen ; Cholesterol (97C5T2UQ7J) ; Semaphorins
    Language English
    Publishing date 2023-11-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1218450-0
    ISSN 1479-6821 ; 1351-0088
    ISSN (online) 1479-6821
    ISSN 1351-0088
    DOI 10.1530/ERC-23-0010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Gli activation by the estrogen receptor in breast cancer cells: Regulation of cancer cell growth by Gli3.

    Massah, Shabnam / Foo, Jane / Li, Na / Truong, Sarah / Nouri, Mannan / Xie, Lishi / Prins, Gail S / Buttyan, Ralph

    Molecular and cellular endocrinology

    2020  Volume 522, Page(s) 111136

    Abstract: Background: Gli is an oncogenic transcription factor family thought to be involved in breast cancer (BrCa) cell growth. Gli activity is regulated by a post-translational proteolytic process that is suppressed by Hedgehog signaling. In prostate cancer ... ...

    Abstract Background: Gli is an oncogenic transcription factor family thought to be involved in breast cancer (BrCa) cell growth. Gli activity is regulated by a post-translational proteolytic process that is suppressed by Hedgehog signaling. In prostate cancer cells, however, Gli activation is mediated by an interaction of active androgen receptor proteins with Gli3 that stabilizes Gli3 in its un-proteolyzed form. Here we show that the estrogen receptor (ER), ERα, also binds Gli3 and activates Gli in BrCa cells. Moreover, we show that ER + BrCa cells are dependent on Gli3 for cancer cell growth.
    Methods: Transfection with Gli-luciferase reporter was used to report Gli activity in 293FT or BrCa cells (MCF7, T47D, MDA-MB-453) with or without steroid ligands. Co-immunoprecipitation and proximity ligation were used to show association of Gli3 with ERα. Gli3 stability was determined by western blots of BrCa cell extracts. ERα knockdown or destabilization (by fulvestrant) was used to assess how loss of ERα affects estradiol-induced Gli reporter activity, formation of intranuclear ERα-Gli3 complexes and Gli3 stability. Expression of Gli1 and/or other endogenous Gli-target genes in BrCa cells were measured by qPCR in the presence or absence of estradiol. Gli3 knockdown was assessed for effects on BrCa cell growth using the Cyquant assay.
    Results: ERα co-transfection increased Gli reporter activity in 293FT cells that was further increased by estradiol. Gli3 co-precipitated in ERα immunoprecipitates. Acute (2 h) estradiol increased Gli reporter activity and the formation of intranuclear ERα-Gli3 complexes in ER + BrCa cells but more chronic estradiol (48 h) reduced ERα-Gli complexes commensurate with reduced ERα levels. Gli3 stability and endogenous activity was only increased by more chronic estradiol treatment. Fulvestrant or ERα knockdown suppressed E2-induction of Gli activity, intranuclear ERα-Gli3 complexes and stabilization of Gli3. Gli3 knockdown significantly reduced the growth of BrCa cells.
    Conclusions: ERα interacts with Gli3 in BrCa cells and estradiol treatment leads to Gli3 stabilization and increased expression of Gli-target genes. Furthermore, we found tthat Gli3 is necessary for BrCa cell growth. These results support the idea that the ERα-Gli interaction and Gli3 may be novel targets for effective control of BrCa growth.
    MeSH term(s) Breast Neoplasms/metabolism ; Breast Neoplasms/pathology ; Cell Line, Tumor ; Cell Nucleus/drug effects ; Cell Nucleus/metabolism ; Cell Proliferation/drug effects ; Estradiol/pharmacology ; Female ; HEK293 Cells ; Humans ; Protein Stability/drug effects ; Receptors, Estrogen/metabolism ; Zinc Finger Protein Gli3/metabolism
    Chemical Substances Receptors, Estrogen ; Zinc Finger Protein Gli3 ; Estradiol (4TI98Z838E)
    Language English
    Publishing date 2020-12-25
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 187438-x
    ISSN 1872-8057 ; 0303-7207
    ISSN (online) 1872-8057
    ISSN 0303-7207
    DOI 10.1016/j.mce.2020.111136
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Gli activation by the estrogen receptor in breast cancer cells: Regulation of cancer cell growth by Gli3

    Massah, Shabnam / Foo, Jane / Li, Na / Truong, Sarah / Nouri, Mannan / Xie, Lishi / Prins, Gail S / Buttyan, Ralph

    Molecular and cellular endocrinology. 2021 Feb. 15, v. 522

    2021  

    Abstract: Gli is an oncogenic transcription factor family thought to be involved in breast cancer (BrCa) cell growth. Gli activity is regulated by a post-translational proteolytic process that is suppressed by Hedgehog signaling. In prostate cancer cells, however, ...

    Abstract Gli is an oncogenic transcription factor family thought to be involved in breast cancer (BrCa) cell growth. Gli activity is regulated by a post-translational proteolytic process that is suppressed by Hedgehog signaling. In prostate cancer cells, however, Gli activation is mediated by an interaction of active androgen receptor proteins with Gli3 that stabilizes Gli3 in its un-proteolyzed form. Here we show that the estrogen receptor (ER), ERα, also binds Gli3 and activates Gli in BrCa cells. Moreover, we show that ER + BrCa cells are dependent on Gli3 for cancer cell growth.Transfection with Gli-luciferase reporter was used to report Gli activity in 293FT or BrCa cells (MCF7, T47D, MDA-MB-453) with or without steroid ligands. Co-immunoprecipitation and proximity ligation were used to show association of Gli3 with ERα. Gli3 stability was determined by western blots of BrCa cell extracts. ERα knockdown or destabilization (by fulvestrant) was used to assess how loss of ERα affects estradiol-induced Gli reporter activity, formation of intranuclear ERα-Gli3 complexes and Gli3 stability. Expression of Gli1 and/or other endogenous Gli-target genes in BrCa cells were measured by qPCR in the presence or absence of estradiol. Gli3 knockdown was assessed for effects on BrCa cell growth using the Cyquant assay.ERα co-transfection increased Gli reporter activity in 293FT cells that was further increased by estradiol. Gli3 co-precipitated in ERα immunoprecipitates. Acute (2 h) estradiol increased Gli reporter activity and the formation of intranuclear ERα-Gli3 complexes in ER + BrCa cells but more chronic estradiol (48 h) reduced ERα-Gli complexes commensurate with reduced ERα levels. Gli3 stability and endogenous activity was only increased by more chronic estradiol treatment. Fulvestrant or ERα knockdown suppressed E2-induction of Gli activity, intranuclear ERα-Gli3 complexes and stabilization of Gli3. Gli3 knockdown significantly reduced the growth of BrCa cells.ERα interacts with Gli3 in BrCa cells and estradiol treatment leads to Gli3 stabilization and increased expression of Gli-target genes. Furthermore, we found tthat Gli3 is necessary for BrCa cell growth. These results support the idea that the ERα-Gli interaction and Gli3 may be novel targets for effective control of BrCa growth.
    Keywords Western blotting ; androgen receptors ; breast neoplasms ; cell growth ; coprecipitation ; estradiol ; estrogen receptors ; extracts ; genes ; ligands ; neoplasm cells ; precipitin tests ; prostatic neoplasms ; proteolysis
    Language English
    Dates of publication 2021-0215
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-light
    ZDB-ID 187438-x
    ISSN 1872-8057 ; 0303-7207
    ISSN (online) 1872-8057
    ISSN 0303-7207
    DOI 10.1016/j.mce.2020.111136
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Editorial comment on: Hedgehog signalling in androgen independent prostate cancer.

    Chen, Mengqian / Buttyan, Ralph

    European urology

    2008  Volume 54, Issue 6, Page(s) 1341–1343

    MeSH term(s) Androgens/physiology ; Hedgehog Proteins/physiology ; Humans ; Male ; Prostatic Neoplasms/etiology ; Signal Transduction
    Chemical Substances Androgens ; Hedgehog Proteins
    Language English
    Publishing date 2008-12
    Publishing country Switzerland
    Document type Comment ; Editorial
    ZDB-ID 193790-x
    ISSN 1421-993X ; 0302-2838
    ISSN (online) 1421-993X
    ISSN 0302-2838
    DOI 10.1016/j.eururo.2008.01.071
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Molecularly targeted therapies for renal cell cancer: TRAIL research advances.

    Buttyan, Ralph / Mian, Badar M

    The Journal of urology

    2007  Volume 177, Issue 5, Page(s) 1606

    MeSH term(s) Antineoplastic Agents/therapeutic use ; Apoptosis/drug effects ; Carcinoma, Renal Cell/drug therapy ; Carcinoma, Renal Cell/metabolism ; Carcinoma, Renal Cell/pathology ; Humans ; Kidney Neoplasms/drug therapy ; Kidney Neoplasms/metabolism ; Kidney Neoplasms/pathology ; Receptors, Vascular Endothelial Growth Factor/drug effects ; Treatment Outcome
    Chemical Substances Antineoplastic Agents ; Receptors, Vascular Endothelial Growth Factor (EC 2.7.10.1)
    Language English
    Publishing date 2007-05
    Publishing country United States
    Document type Comment ; Editorial
    ZDB-ID 3176-8
    ISSN 1527-3792 ; 0022-5347
    ISSN (online) 1527-3792
    ISSN 0022-5347
    DOI 10.1016/j.juro.2007.01.109
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Non-canonical activation of hedgehog in prostate cancer cells mediated by the interaction of transcriptionally active androgen receptor proteins with Gli3.

    Li, Na / Truong, Sarah / Nouri, Mannan / Moore, Jackson / Al Nakouzi, Nader / Lubik, Amy Anne / Buttyan, Ralph

    Oncogene

    2018  Volume 37, Issue 17, Page(s) 2313–2325

    Abstract: Hedgehog (Hh) is an oncogenic signaling pathway that regulates the activity of Gli transcription factors. Canonical Hh is a Smoothened- (Smo-) driven process that alters the post-translational processing of Gli2/Gli3 proteins. Though evidence supports a ... ...

    Abstract Hedgehog (Hh) is an oncogenic signaling pathway that regulates the activity of Gli transcription factors. Canonical Hh is a Smoothened- (Smo-) driven process that alters the post-translational processing of Gli2/Gli3 proteins. Though evidence supports a role for Gli action in prostate cancer (PCa) cell growth and progression, there is little indication that Smo is involved. Here we describe a non-canonical means for activation of Gli transcription in PCa cells mediated by the binding of transcriptionally-active androgen receptors (ARs) to Gli3. Androgens stimulated reporter expression from a Gli-dependent promoter in a variety of AR + PCa cells and this activity was suppressed by an anti-androgen, Enz, or by AR knockdown. Androgens also upregulated expression of endogenous Gli-dependent genes. This activity was associated with increased intranuclear binding of Gli3 to AR that was antagonized by Enz. Fine mapping of the AR binding domain on Gli2 showed that AR recognizes the Gli protein processing domain (PPD) in the C-terminus. Mutations in the arginine-/serine repeat elements of the Gli2 PPD involved in phosphorylation and ubiquitinylation blocked the binding to AR. β-TrCP, a ubiquitin ligase that recognizes the Gli PPD, competed with AR for binding to this site. AR binding to Gli3 suppressed its proteolytic processing to the Gli3 repressor form (Gli3R) whereas AR knockdown increased Gli3R. Both full-length and truncated ARs were able to activate Gli transcription. Finally, we found that an ARbinding decoy polypeptide derived from the Gli2 C-terminus can compete with Gli3 for binding to AR. Exogenous overexpression of this decoy suppressed Gli transcriptional activity in PCa cells. Collectively, this work identifies a novel pathway for non-canonical activation of Hh signaling in PCa cells and identifies a means for interference that may have clinical relevance for PCa patients.
    MeSH term(s) Cell Line, Tumor ; Gene Expression Regulation, Neoplastic ; HEK293 Cells ; Hedgehog Proteins/genetics ; Humans ; Male ; Nerve Tissue Proteins/metabolism ; Promoter Regions, Genetic ; Prostatic Neoplasms/genetics ; Prostatic Neoplasms/metabolism ; Prostatic Neoplasms/pathology ; Protein Binding ; Receptors, Androgen/metabolism ; Signal Transduction/physiology ; Transcription Factors/metabolism ; Transcriptional Activation ; Zinc Finger Protein Gli3/metabolism
    Chemical Substances AR protein, human ; GLI3 protein, human ; Hedgehog Proteins ; Nerve Tissue Proteins ; Receptors, Androgen ; Transcription Factors ; Zinc Finger Protein Gli3
    Language English
    Publishing date 2018-02-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 639046-8
    ISSN 1476-5594 ; 0950-9232
    ISSN (online) 1476-5594
    ISSN 0950-9232
    DOI 10.1038/s41388-017-0098-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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