1
|
Tanabe H, Suzuki T, Ohishi T, Isemura M, Nakamura Y, Unno K. Effects of Epigallocatechin-3-Gallate on Matrix Metalloproteinases in Terms of Its Anticancer Activity. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020525. [PMID: 36677584 PMCID: PMC9862901 DOI: 10.3390/molecules28020525] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/29/2022] [Accepted: 12/31/2022] [Indexed: 01/06/2023]
Abstract
Epidemiological studies have shown that the consumption of green tea has beneficial effects against cancer. Basic studies have provided evidence that epigallocatechin gallate (EGCG) is a major contributor to these effects. Matrix metalloproteinases (MMPs) are zinc-dependent metalloproteinases with the ability to degrade the extracellular matrix proteins and are involved in various diseases including cancer in which MMPs have a critical role in invasion and metastasis. In this review, we discuss the effects of EGCG on several types of MMPs in the context of its anticancer activity. In the promoter region, MMPs have binding sites for at least one transcription factor of AP-1, Sp1, and NF-κB, and EGCG can downregulate these transcription factors through signaling pathways mediated by reactive oxygen species. EGCG can also decrease nuclear ERK, p38, heat shock protein-27 (Hsp27), and β-catenin levels, leading to suppression of MMPs' expression. Other mechanisms by which EGCG inhibits MMPs include direct binding to MMPs to prevent their activation and downregulation of NF-κB to suppress the production of inflammatory cytokines such as TNFα and IL-1β. Findings from studies on EGCG presented here may be useful in the development of more effective anti-MMP agents, which would give beneficial effects on cancer and other diseases.
Collapse
Affiliation(s)
- Hiroki Tanabe
- Faculty of Health and Welfare Science, Nayoro City University, Nayoro 096-8641, Hokkaido, Japan
- Correspondence: (H.T.); (T.O.)
| | - Takuji Suzuki
- Department of Food Science and Nutrition, Faculty of Human Life and Science, Doshisha Women’s College of Liberal Arts, Kyoto 602-0893, Japan
| | - Tomokazu Ohishi
- Institute of Microbial Chemistry (BIKAKEN), Numazu, Microbial Chemistry Research Foundation, Numazu 410-0301, Shizuoka, Japan
- Institute of Microbial Chemistry (BIKAKEN), Laboratory of Oncology, Microbial Chemistry Research Foundation, Shinagawa, Tokyo 141-0021, Japan
- Correspondence: (H.T.); (T.O.)
| | - Mamoru Isemura
- Tea Science Center, University of Shizuoka, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yoriyuki Nakamura
- Tea Science Center, University of Shizuoka, Suruga-ku, Shizuoka 422-8526, Japan
| | - Keiko Unno
- Tea Science Center, University of Shizuoka, Suruga-ku, Shizuoka 422-8526, Japan
| |
Collapse
|
2
|
Bakhshandeh N, Mohammadi M, Mohammadi P, Nazari E, Damchi M, Khodabandelu S, Mokhtari H. Increased expression of androgen receptor and PSA genes in LNCaP (prostate cancer) cell line due to high concentrations of EGCG, an active ingredient in green tea. Horm Mol Biol Clin Investig 2022:hmbci-2022-0054. [PMID: 36578191 DOI: 10.1515/hmbci-2022-0054] [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: 06/02/2022] [Accepted: 12/11/2022] [Indexed: 12/30/2022]
Abstract
OBJECTIVES Androgen receptor (AR) play a key role in the onset and progression of prostate cancer. Epigallocatechin-3-gallate (EGCG) is a polyphenolic compound and the active ingredient in green tea, which is involved in modulating gene expression through epigenetic alterations. Previous studies have shown that EGCG at low concentrations reduces the expression of AR and prostate-specific antigen (PSA) in the LNCaP cell line of prostate cancer. In this study, the effect of higher EGCG concentrations on AR and PSA expression in LNCaP prostate cancer cell line was investigated. METHODS In this study, LNCaP prostate cancer cell line was used and after MTT test, concentrations of 40, 60 and 80 μg/mL EGCG were used for treatment. Then, the expression of AR and PSA genes was evaluated by RT-PCR. AR protein expression was also assessed by Western blotting. RESULTS The present study showed that treatment of LNCaPs cells by EGCG reduces cell proliferation. The IC50 value was 42.7 μg/mL under experimental conditions. It was also observed that EGCG at concentrations of 40 and 80 μg/mL increased the expression of AR and PSA (p<0.05). CONCLUSIONS The present study showed that the effect of EGCG on AR expression was different at different concentrations, so that unlike previous studies, higher concentrations of EGCG (80 and 40 μg/mL) increased AR and PSA expression. It seems that due to the toxic effects of EGCG in high concentrations on cancer cells and the possibility of its effect on normal cells, more caution should be exercised in its use.
Collapse
Affiliation(s)
- Nadereh Bakhshandeh
- Department of Medical Biochemistry and Genetics, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Maryam Mohammadi
- Health System Research, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Parisa Mohammadi
- Department of Clinical Biochemistry, School of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Elahe Nazari
- Department of Biology, Islamic Azad University, Gorgan Branch, Gorgan, Iran
| | - Mehdi Damchi
- Department of Clinical Biochemistry, School of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Sajad Khodabandelu
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Hossein Mokhtari
- Amol Faculty of Paramedicine, Mazandaran University of Medical Sciences, Sari, Iran
| |
Collapse
|
3
|
Moradi A, Srinivasan S, Clements J, Batra J. Beyond the biomarker role: prostate-specific antigen (PSA) in the prostate cancer microenvironment. Cancer Metastasis Rev 2020; 38:333-346. [PMID: 31659564 DOI: 10.1007/s10555-019-09815-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The prostate-specific antigen (PSA) blood test is the accepted biomarker of tumor recurrence. PSA levels in serum correlate with disease progression, though its diagnostic accuracy is questionable. As a result, significant progress has been made in developing modified PSA tests such as PSA velocity, PSA density, 4Kscore, PSA glycoprofiling, Prostate Health Index, and the STHLM3 test. PSA, a serine protease, is secreted from the epithelial cells of the prostate. PSA has been suggested as a molecular target for prostate cancer therapy due to the fact that it is not only active in prostate tissue but also has a pivotal role on prostate cancer signaling pathways including proliferation, invasion, metastasis, angiogenesis, apoptosis, immune response, and tumor microenvironment regulation. Here, we summarize the current standing of PSA in prostate cancer progression as well as its utility in prostate cancer therapeutic approaches with an emphasis on the role of PSA in the tumor microenvironment.
Collapse
Affiliation(s)
- Afshin Moradi
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.,Translational Research Institute, Queensland University of Technology, Brisbane, Australia
| | - Srilakshmi Srinivasan
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.,Translational Research Institute, Queensland University of Technology, Brisbane, Australia
| | - Judith Clements
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.,Translational Research Institute, Queensland University of Technology, Brisbane, Australia
| | - Jyotsna Batra
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia. .,Translational Research Institute, Queensland University of Technology, Brisbane, Australia.
| |
Collapse
|
4
|
Fontana F, Raimondi M, Marzagalli M, Di Domizio A, Limonta P. Natural Compounds in Prostate Cancer Prevention and Treatment: Mechanisms of Action and Molecular Targets. Cells 2020; 9:cells9020460. [PMID: 32085497 PMCID: PMC7072821 DOI: 10.3390/cells9020460] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/10/2020] [Accepted: 02/15/2020] [Indexed: 02/06/2023] Open
Abstract
Prostate cancer (PCa) represents a major cause of cancer mortality among men in developed countries. Patients with recurrent disease initially respond to androgen-deprivation therapy, but the tumor eventually progresses into castration-resistant PCa; in this condition, tumor cells acquire the ability to escape cell death and develop resistance to current therapies. Thus, new therapeutic approaches for PCa management are urgently needed. In this setting, natural products have been extensively studied for their anti-PCa activities, such as tumor growth suppression, cell death induction, and inhibition of metastasis and angiogenesis. Additionally, numerous studies have shown that phytochemicals can specifically target the androgen receptor (AR) signaling, as well as the PCa stem cells (PCSCs). Interestingly, many clinical trials have been conducted to test the efficacy of nutraceuticals in human subjects, and they have partially confirmed the promising results obtained in vitro and in preclinical models. This article summarizes the anti-cancer mechanisms and therapeutic potentials of different natural compounds in the context of PCa prevention and treatment.
Collapse
Affiliation(s)
- Fabrizio Fontana
- Department of Pharmacological and Biomolecular Sciences, University of Milano, 20133 Milano, Italy; (F.F.); (M.R.); (M.M.); (A.D.D.)
| | - Michela Raimondi
- Department of Pharmacological and Biomolecular Sciences, University of Milano, 20133 Milano, Italy; (F.F.); (M.R.); (M.M.); (A.D.D.)
| | - Monica Marzagalli
- Department of Pharmacological and Biomolecular Sciences, University of Milano, 20133 Milano, Italy; (F.F.); (M.R.); (M.M.); (A.D.D.)
| | - Alessandro Di Domizio
- Department of Pharmacological and Biomolecular Sciences, University of Milano, 20133 Milano, Italy; (F.F.); (M.R.); (M.M.); (A.D.D.)
- SPILLOproject, 20037 Paderno Dugnano, Italy
| | - Patrizia Limonta
- Department of Pharmacological and Biomolecular Sciences, University of Milano, 20133 Milano, Italy; (F.F.); (M.R.); (M.M.); (A.D.D.)
- Correspondence: ; Tel.: +39-0250318213
| |
Collapse
|
5
|
Matin F, Jeet V, Srinivasan S, Cristino AS, Panchadsaram J, Clements JA, Batra J. MicroRNA-3162-5p-Mediated Crosstalk between Kallikrein Family Members Including Prostate-Specific Antigen in Prostate Cancer. Clin Chem 2019; 65:771-780. [PMID: 31018918 DOI: 10.1373/clinchem.2018.295824] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 02/05/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND MicroRNAs mediate biological processes through preferential binding to the 3' untranslated region (3' UTR) of target genes. Studies have shown their association with prostate cancer (PCa) risk through single-nucleotide polymorphisms (SNPs), known as miRSNPs. In a European cohort, 22 PCa risk-associated miRSNPs have been identified. The most significant miRSNP in the 3' UTR of Kallikrein-related peptidase 3 (KLK3) created a binding site for miR-3162-5p. Here we investigated the miR-3162-5p-KLK interaction and the clinical implication of miR-3162-5p in PCa. METHODS We tested the role of miR-3162-5p in PCa etiology using IncuCyte live-cell imaging and anchorage-independent growth assays. The effect of miR-3162-5p on KLK and androgen receptor (AR) expression was measured by RT-quantitative (q)PCR and target pulldown assays. KLK3 proteolytic activity was determined by DELFIA® immunoassay. Mass spectrometry identified pathways affected by miR-3162-5p. miR-3162-5p expression was measured in clinical samples using RT-qPCR. RESULTS miR-3162-5p affected proliferation, migration, and colony formation of LNCaP cells by regulating the expression of KLK2-4 and AR by direct targeting. KLK3 protein expression was regulated by miR-3162-5p consistent with lower KLK3 proteolytic activity observed in LNCaP-conditioned media. KLK/AR pulldown and mass spectrometry analysis showed a potential role of miR-3162-5p in metabolic pathways via KLK/AR and additional targets. Increased miR-3162-5p expression was observed in prostate tumor tissues with higher Gleason grade. CONCLUSIONS Our study provides an insight into possible involvement of miR-3162-5p in PCa etiology by targeting KLKs and AR. It highlights clinical utility of miR-3162-5p and its interactive axis as a new class of biomarkers and therapeutic targets for PCa.
Collapse
Affiliation(s)
- Farhana Matin
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australian Prostate Cancer Research Centre-Queensland (APCRC-Q), Translational Research Institute, Brisbane, Australia
| | - Varinder Jeet
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australian Prostate Cancer Research Centre-Queensland (APCRC-Q), Translational Research Institute, Brisbane, Australia
| | - Srilakshmi Srinivasan
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australian Prostate Cancer Research Centre-Queensland (APCRC-Q), Translational Research Institute, Brisbane, Australia
| | - Alexandre S Cristino
- University of Queensland Diamantina Institute (UQDI), Faculty of Medicine, Translational Research Institute, University of Queensland, Brisbane, Australia
| | - Janaththani Panchadsaram
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australian Prostate Cancer Research Centre-Queensland (APCRC-Q), Translational Research Institute, Brisbane, Australia
| | | | - Jyotsna Batra
- School of Biomedical Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Australian Prostate Cancer Research Centre-Queensland (APCRC-Q), Translational Research Institute, Brisbane, Australia;
| | | |
Collapse
|
6
|
Srinivasan S, Stephens C, Wilson E, Panchadsaram J, DeVoss K, Koistinen H, Stenman UH, Brook MN, Buckle AM, Klein RJ, Lilja H, Clements J, Batra J. Prostate Cancer Risk-Associated Single-Nucleotide Polymorphism Affects Prostate-Specific Antigen Glycosylation and Its Function. Clin Chem 2018; 65:e1-e9. [PMID: 30538125 DOI: 10.1373/clinchem.2018.295790] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 11/15/2018] [Indexed: 01/07/2023]
Abstract
BACKGROUND Genetic association studies have reported single-nucleotide polymorphisms (SNPs) at chromosome 19q13.3 to be associated with prostate cancer (PCa) risk. Recently, the rs61752561 SNP (Asp84Asn substitution) in exon 3 of the kallikrein-related peptidase 3 (KLK3) gene encoding prostate-specific antigen (PSA) was reported to be strongly associated with PCa risk (P = 2.3 × 10-8). However, the biological contribution of the rs61752561 SNP to PCa risk has not been elucidated. METHODS Recombinant PSA protein variants were generated to assess the SNP-mediated biochemical changes by stability and substrate activity assays. PC3 cell-PSA overexpression models were established to evaluate the effect of the SNP on PCa pathogenesis. Genotype-specific correlation of the SNP with total PSA (tPSA) concentrations and free/total (F/T) PSA ratio were determined from serum samples. RESULTS Functional analysis showed that the rs61752561 SNP affects PSA stability and structural conformation and creates an extra glycosylation site. This PSA variant had reduced enzymatic activity and the ability to stimulate proliferation and migration of PCa cells. Interestingly, the minor allele is associated with lower tPSA concentrations and high F/T PSA ratio in serum samples, indicating that the amino acid substitution may affect PSA immunoreactivity to the antibodies used in the clinical immunoassays. CONCLUSIONS The rs61752561 SNP appears to have a potential role in PCa pathogenesis by changing the glycosylation, protein stability, and PSA activity and may also affect the clinically measured F/T PSA ratio. Accounting for these effects on tPSA concentration and F/T PSA ratio may help to improve the accuracy of the current PSA test.
Collapse
Affiliation(s)
- Srilakshmi Srinivasan
- Australian Prostate Cancer Research Centre-Queensland and Cancer Program, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.,Translational Research Institute, Woolloongabba, Queensland, Australia
| | - Carson Stephens
- Australian Prostate Cancer Research Centre-Queensland and Cancer Program, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.,Translational Research Institute, Woolloongabba, Queensland, Australia
| | - Emily Wilson
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Janaththani Panchadsaram
- Australian Prostate Cancer Research Centre-Queensland and Cancer Program, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.,Translational Research Institute, Woolloongabba, Queensland, Australia
| | - Kerry DeVoss
- Endocrinology, QML Pathology, Mansfield, Queensland, Australia
| | - Hannu Koistinen
- Department of Clinical Chemistry, Biomedicum Helsinki, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
| | - Ulf-Håkan Stenman
- Department of Clinical Chemistry, Biomedicum Helsinki, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
| | | | - Ashley M Buckle
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Robert J Klein
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Hans Lilja
- Departments of Laboratory Medicine, Surgery (Urology Service) and Medicine (Genitourinary Oncology), Memorial Sloan Kettering Cancer Center, New York, NY.,Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK.,Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Judith Clements
- Australian Prostate Cancer Research Centre-Queensland and Cancer Program, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.,Translational Research Institute, Woolloongabba, Queensland, Australia
| | - Jyotsna Batra
- Australian Prostate Cancer Research Centre-Queensland and Cancer Program, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia; .,Translational Research Institute, Woolloongabba, Queensland, Australia
| | | |
Collapse
|
7
|
Frieling JS, Shay G, Izumi V, Aherne ST, Saul RG, Budzevich M, Koomen J, Lynch CC. Matrix metalloproteinase processing of PTHrP yields a selective regulator of osteogenesis, PTHrP 1-17. Oncogene 2017; 36:4498-4507. [PMID: 28368420 DOI: 10.1038/onc.2017.70] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 01/19/2017] [Accepted: 02/21/2017] [Indexed: 01/02/2023]
Abstract
Parathyroid hormone-related protein (PTHrP) is a critical regulator of bone resorption and augments osteolysis in skeletal malignancies. Here we report that the mature PTHrP1-36 hormone is processed by matrix metalloproteinases to yield a stable product, PTHrP1-17. PTHrP1-17 retains the ability to signal through PTH1R to induce calcium flux and ERK phosphorylation but not cyclic AMP production or CREB phosphorylation. Notably, PTHrP1-17 promotes osteoblast migration and mineralization in vitro, and systemic administration of PTHrP1-17 augments ectopic bone formation in vivo. Further, in contrast to PTHrP1-36, PTHrP1-17 does not affect osteoclast formation/function in vitro or in vivo. Finally, immunoprecipitation-mass spectrometry analyses using PTHrP1-17-specific antibodies establish that PTHrP1-17 is indeed generated by cancer cells. Thus, matrix metalloproteinase-directed processing of PTHrP disables the osteolytic functions of the mature hormone to promote osteogenesis, indicating important roles for this circuit in bone remodelling in normal and disease contexts.
Collapse
Affiliation(s)
- J S Frieling
- Departments of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - G Shay
- Departments of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - V Izumi
- Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - S T Aherne
- Departments of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - R G Saul
- Antibody Characterization Lab, Leidos Biomedical Research, Frederick, MD, USA
| | - M Budzevich
- Cancer Imaging and Metabolism, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - J Koomen
- Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - C C Lynch
- Departments of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| |
Collapse
|
8
|
Guo Y, Zhi F, Chen P, Zhao K, Xiang H, Mao Q, Wang X, Zhang X. Green tea and the risk of prostate cancer: A systematic review and meta-analysis. Medicine (Baltimore) 2017; 96:e6426. [PMID: 28353571 PMCID: PMC5380255 DOI: 10.1097/md.0000000000006426] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Prostate cancer (PCa) now remains the 2nd most frequently diagnosed cancer. In recent years, chemoprevention for PCa becomes a possible concept. Especially, many phytochemicals rich foods are suggested to lower the risk of cancer. Among these foods, green tea is considered as effective prevention for various cancers. However, clinical trials and previous meta-analyses on the relationship between green tea consumption and the risk of PCa have produced inconsistent outcomes. This study aims to determine the dose-response association of green tea intake with PCa risk and the preventive effect of green tea catechins on PCa risk. Seven observational studies and 3 randomized controlled trials were retrieved from Cochrane Library, PubMed, Sciencedirect Online, and hand searching. The STATA (version 12.0) was applied to analyze the data. The relative risks (RRs) and 95% confidence intervals were pooled by fixed or random effect modeling. Dose-response relations were evaluated with categories of green tea intake. Although there was no statistical significance in the comparison of the highest versus lowest category, there was a trend of reduced incidence of PCa with each 1 cup/day increase of green tea (P = 0.08). Our dose-response meta-analysis further demonstrated that higher green tea consumption was linearly associated with a reduced risk of PCa with more than 7 cups/day. In addition, green tea catechins were effective for preventing PCa with an RR of 0.38 (P = 0.02). In conclusion, our dose-response meta-analysis evaluated the association of green tea intake with PCa risk systematically and quantitatively. And this is the first meta-analysis of green tea catechins consumption and PCa incidence. Our novel data demonstrated that higher green tea consumption was linearly reduced PCa risk with more than 7 cups/day and green tea catechins were effective for preventing PCa. However, further studies are required to substantiate these conclusions.
Collapse
Affiliation(s)
- Yuming Guo
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Fan Zhi
- Department of Urology, People's Hospital of New District Longhua, Shenzhen, P.R. China
| | - Ping Chen
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Keke Zhao
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Han Xiang
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Qi Mao
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Xinghuan Wang
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| | - Xinhua Zhang
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan
| |
Collapse
|
9
|
Cereda V, Formica V, Menghi A, Pellicori S, Roselli M. Kallikrein-related peptidases targeted therapies in prostate cancer: perspectives and challenges. Expert Opin Investig Drugs 2015; 24:929-47. [PMID: 25858813 DOI: 10.1517/13543784.2015.1035708] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
INTRODUCTION Despite the emergence of several new effective treatments for metastatic castration-resistant prostate cancer patients, disease progression inevitably occurs, leading scientific community to carefully look for novel therapeutic targets of prostate cancer. Kallikrein (KLK)-related peptidases have been demonstrated to facilitate prostate tumorigenesis and disease progression through the development of an oncogenic microenvironment for prostate cells. AREAS COVERED This review first summarizes the large amount of preclinical data showing the involvement of KLKs in prostate cancer pathobiology. In the second part, the authors assess the current status and future directions for KLK-targeted therapy and briefly describe the advances and challenges implicated in the design of effective manufactured drugs. The authors then focus on the preclinical data and on Phase I/II studies of the most promising KLK-targeted agents in prostate cancer. The drugs discussed here are divided on the basis of their mechanism of action: KLK-engineered inhibitors; KLK-activated pro-drugs; KLK-targeted microRNAs and small interfering RNAs(-/)small hairpin RNAs; KLK vaccines and antibodies. EXPERT OPINION Targeting KLK expression and/or activity could be a promising direction in prostate cancer treatment. Future human clinical trials will help us to evaluate the real benefits, toxicities and the consequent optimal use of KLK-targeted drugs, as mono-therapy or in combination regimens.
Collapse
Affiliation(s)
- Vittore Cereda
- 1 University of Rome Tor Vergata, Tor Vergata University Clinical Center, Department of Systems Medicine, Medical Oncology , Viale Oxford 81, 00133 Rome , Italy +39 0620908190 ; +39 0620903504 ;
| | | | | | | | | |
Collapse
|
10
|
Gonçalves BF, Campos SGPD, Costa CF, Scarano WR, Góes RM, Taboga SR. Key participants of the tumor microenvironment of the prostate: an approach of the structural dynamic of cellular elements and extracellular matrix components during epithelial-stromal transition. Acta Histochem 2015; 117:4-13. [PMID: 25466989 DOI: 10.1016/j.acthis.2014.10.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 10/23/2014] [Accepted: 10/24/2014] [Indexed: 01/03/2023]
Abstract
Cancer is a multistep process that begins with the transformation of normal epithelial cells and continues with tumor growth, stromal invasion and metastasis. The remodeling of the peritumoral environment is decisive for the onset of tumor invasiveness. This event is dependent on epithelial-stromal interactions, degradation of extracellular matrix components and reorganization of fibrillar components. Our research group has studied in a new proposed rodent model the participation of cellular and molecular components in the prostate microenvironment that contributes to cancer progression. Our group adopted the gerbil Meriones unguiculatus as an alternative experimental model for prostate cancer study. This model has presented significant responses to hormonal treatments and to development of spontaneous and induced neoplasias. The data obtained indicate reorganization of type I collagen fibers and reticular fibers, synthesis of new components such as tenascin and proteoglycans, degradation of basement membrane components and elastic fibers and increased expression of metalloproteinases. Fibroblasts that border the region, apparently participate in the stromal reaction. The roles of each of these events, as well as some signaling molecules, participants of neoplastic progression and factors that promote genetic reprogramming during epithelial-stromal transition are also discussed.
Collapse
|
11
|
Mavridis K, Avgeris M, Scorilas A. Targeting kallikrein-related peptidases in prostate cancer. Expert Opin Ther Targets 2014; 18:365-83. [DOI: 10.1517/14728222.2014.880693] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
12
|
Vermassen T, Speeckaert MM, Lumen N, Rottey S, Delanghe JR. Glycosylation of prostate specific antigen and its potential diagnostic applications. Clin Chim Acta 2012; 413:1500-5. [PMID: 22722018 DOI: 10.1016/j.cca.2012.06.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 06/04/2012] [Indexed: 01/28/2023]
Abstract
Prostate specific antigen (PSA) assays are widely used for early detection of prostate cancer. However, those analyses are associated with considerable sensitivity and specificity problems. Several approaches have been developed to tackle this issue. PSA is a glycoprotein, which is primarily produced by the prostatic epithelial cells. Aberrant glycosylation modification of proteins is a fundamental characteristic of tumorigenesis. Study of PSA glycoforms offers interesting diagnostic perspectives. Modern technology allows us to analyze PSA glycoforms in a variety of clinical samples (serum or plasma, urine, seminal fluid, tissue). A number of novel techniques, such as lectin-based detection methods, mass spectrometry, 2-dimensional electrophoresis and capillary electrophoresis have been developed to analyze PSA glycosylation. This article reviews the technical and diagnostic aspects of PSA glycoforms.
Collapse
Affiliation(s)
- Tijl Vermassen
- Department of Medical Oncology, Ghent University Hospital, Ghent, Belgium
| | | | | | | | | |
Collapse
|
13
|
Anticancer activity of green tea polyphenols in prostate gland. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2012; 2012:984219. [PMID: 22666523 PMCID: PMC3362217 DOI: 10.1155/2012/984219] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 03/12/2012] [Indexed: 01/07/2023]
Abstract
Numerous evidences from prevention studies in humans, support the existence of an association between green tea polyphenols consumption and a reduced cancer risk. Prostate cancer is one of the most frequently diagnosed male neoplasia in the Western countries, which is in agreement with this gland being particularly vulnerable to oxidative stress processes, often associated with tumorigenesis. Tea polyphenols have been extensively studied in cell culture and animal models where they inhibited tumor onset and progression. Prostate cancer appears a suitable target for primary prevention care, since it grows slowly, before symptoms arise, thus offering a relatively long time period for therapeutic interventions. It is, in fact, usually diagnosed in men 50-year-old or older, when even a modest delay in progression of the disease could significantly improve the patients quality of life. Although epidemiological studies have not yet yielded conclusive results on the chemopreventive and anticancer effect of tea polyphenols, there is an increasing trend to employ these substances as conservative management for patients diagnosed with less advanced prostate cancer. Here, we intend to review the most recent observations relating tea polyphenols to human prostate cancer risk, in an attempt to outline better their potential employment for preventing prostate cancer.
Collapse
|
14
|
Weng CJ, Yen GC. Flavonoids, a ubiquitous dietary phenolic subclass, exert extensive in vitro anti-invasive and in vivo anti-metastatic activities. Cancer Metastasis Rev 2012; 31:323-51. [DOI: 10.1007/s10555-012-9347-y] [Citation(s) in RCA: 151] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
15
|
Végvári Á, Rezeli M, Sihlbom C, Häkkinen J, Carlsohn E, Malm J, Lilja H, Laurell T, Marko-Varga G. Molecular microheterogeneity of prostate specific antigen in seminal fluid by mass spectrometry. Clin Biochem 2011; 45:331-8. [PMID: 22209970 DOI: 10.1016/j.clinbiochem.2011.11.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 10/28/2011] [Accepted: 11/14/2011] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Prostate specific antigen (PSA) is a widely used and clinically valuable marker for prostate disease. In order to enable the development of new PSA assays and progress the understanding of the biology of PSA we have analyzed PSA in seminal plasma. DESIGN AND METHODS PSA in seminal plasma from men attending a fertility clinic and healthy controls was analyzed using SDS-PAGE, Western blotting and mass spectrometry. RESULTS Using mass spectrometry, different forms of PSA could be identified in 1-9 bands seen on SDS-PAGE analysis of the respective sample. However, a majority of these molecular forms of PSA were not observed on Western blots. Enzymatic activity of PSA isoforms was demonstrated by sequencing data in zymogram gels. Multivariate analysis of clinical data revealed well-separated patient groups. CONCLUSIONS We demonstrated that PSA in seminal plasma occurs in several isoforms, yet not all were detectable using an antibody based clinical routine method. The heterogeneity of PSA expression might be of clinical significance, by an improved patient phenotyping.
Collapse
Affiliation(s)
- Ákos Végvári
- Clinical Protein Science & Imaging, Dept. of Measurement Technology and Industrial Electrical Engineering, Lund University, Lund, Sweden.
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Connors SK, Chornokur G, Kumar NB. New insights into the mechanisms of green tea catechins in the chemoprevention of prostate cancer. Nutr Cancer 2011; 64:4-22. [PMID: 22098273 DOI: 10.1080/01635581.2012.630158] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Prostate cancer is the most commonly diagnosed cancer and second most common cause of cancer deaths in American men. Its long latency, slow progression, and high incidence rate make prostate cancer ideal for targeted chemopreventative therapies. Therefore, chemoprevention studies and clinical trials are essential for reducing the burden of prostate cancer on society. Epidemiological studies suggest that tea consumption has protective effects against a variety of human cancers, including that of the prostate. Laboratory and clinical studies have demonstrated that green tea components, specifically the green tea catechin (GTC) epigallocatechin gallate, can induce apoptosis, suppress progression, and inhibit invasion and metastasis of prostate cancer. Multiple mechanisms are involved in the chemoprevention of prostate cancer with GTCs; understanding and refining models of fundamental molecular pathways by which GTCs modulate prostate carcinogenesis is essential to apply the utilization of green tea for the chemoprevention of prostate cancer in clinical settings. The objective of this article is to review and summarize the most current literature focusing on the major mechanisms of GTC chemopreventative action on prostate cancer from laboratory, in vitro, and in vivo studies, and clinical chemoprevention trials.
Collapse
Affiliation(s)
- Shahnjayla K Connors
- Department of Cancer Epidemiology, Division of Population Sciences, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida 33612, USA.
| | | | | |
Collapse
|
17
|
Henning SM, Wang P, Heber D. Chemopreventive effects of tea in prostate cancer: green tea versus black tea. Mol Nutr Food Res 2011; 55:905-20. [PMID: 21538852 DOI: 10.1002/mnfr.201000648] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 01/27/2011] [Accepted: 03/01/2011] [Indexed: 02/06/2023]
Abstract
The polyphenol compositions of green tea (GT) and black tea (BT) are very different due to post-harvest processing. GT contains higher concentrations of monomeric polyphenols, which affect numerous intracellular signaling pathways involved in prostate cancer (CaP) development. BT polymers, on the other hand, are poorly absorbed and are converted to phenolic acids by the colonic microflora. Therefore, after consumption of GT, higher concentrations of polyphenols are found in the circulation, whereas after BT consumption the phenolic acid levels in the circulation are higher. The majority of in vitro cell culture, in vivo animal, and clinical intervention studies examine the effects of extracts of GT or purified (-)-epigallocatechin-3-gallate (EGCG) on prostate carcinogenesis. These studies provide strong evidence supporting a chemopreventive effect of GT, but results from epidemiological studies of GT consumption are mixed. While the evidence for a chemopreventive effect of BT is much weaker than the body of evidence with regard to GT, there are several animal BT intervention studies demonstrating inhibition of CaP growth. This article will review in detail the available epidemiological and human clinical studies, as well as animal and basic mechanistic studies on GT and BT supporting a chemopreventive role in CaP.
Collapse
Affiliation(s)
- Susanne M Henning
- Center for Human Nutrition, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
| | | | | |
Collapse
|
18
|
Abstract
Metastasis is the most deadly aspect of cancer and results from several interconnected processes including cell proliferation, angiogenesis, cell adhesion, migration, and invasion into the surrounding tissue. The appearance of metastases in organs distant from the primary tumor is the most destructive feature of cancer. Metastasis remains the principal cause of the deaths of cancer patients despite decades of research aimed at restricting tumor growth. Therefore, inhibition of metastasis is one of the most important issues in cancer research. Several in vitro, in vivo, and epidemiological studies have reported that the consumption of green tea may decrease cancer risk. (-)-Epigallocatechin-3-gallate, major component of green tea, has been shown to inhibit tumor invasion and angiogenesis which are essential for tumor growth and metastasis. This article summarizes the effect of green tea and its major polyphenolic compounds on cancer and metastasis against most commonly diagnosed cancer sites.
Collapse
|
19
|
Brás NF, Gonçalves R, Mateus N, Fernandes PA, Ramos MJ, de Freitas V. Inhibition of pancreatic elastase by polyphenolic compounds. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:10668-10676. [PMID: 20839876 DOI: 10.1021/jf1017934] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Polyphenols are plant secondary metabolites commonly present in the human diet that possess the ability to bind and inhibit digestive proteins. In the present study, kinetic measurements of porcine pancreatic elastase (PPE) activity were determined using Suc-(Ala)(3)-p-nitroanilide as substrate and polyphenolic compounds as inhibitors. A positive relationship between the degree of polyphenol polymerization and the capacity of the polyphenols to inhibit PPE was observed. Procyanidins with a molecular weight of at least 1154 Da were necessary to observe a significant inhibitory ability. Kinetic parameters were also calculated and confirmed that the inhibition is reversible and competitive. Molecular docking and dynamics simulations demonstrated that the tetramer structure has a higher affinity to the enzyme due the establishment of more contact points with the amino acids present in its active site. Hydrogen bond interactions and hydrophobic effects established between the polyphenol groups and the side chain of residues stabilize and favor the binding mode of this procyanidin. This work is relevant to the study of the antinutritional effects caused by dietary tannins on the digestive enzymes' activity, reducing food digestibility and the absorption of nutrients. In general, the elastase model studied herein allows a better understanding of the inhibitory ability of polyphenol compounds.
Collapse
Affiliation(s)
- Natércia F Brás
- REQUIMTE, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | | | | | | | | | | |
Collapse
|
20
|
|
21
|
Brás NF, Gonçalves R, Fernandes PA, Mateus N, Ramos MJ, de Freitas V. Understanding the binding of procyanidins to pancreatic elastase by experimental and computational methods. Biochemistry 2010; 49:5097-108. [PMID: 20481639 DOI: 10.1021/bi100410q] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Human diets are rich in secondary metabolites such as polyphenols. These compounds perform a wide range of crucial functions in biological systems and are of great interest for the pharmaceutical and food industries. In this work, the binding mode of the natural polyphenolic compounds from grape seed on the porcine pancreatic elastase surface was studied by experimental and computational methods. Fluorescence quenching, circular dichroism, nephelometry, dynamic light scattering (DLS), molecular docking, and molecular dynamics simulation studies were performed. A decrease in fluorescence intensities was observed with addition of increasing polyphenol concentrations. The order of binding ability obtained was oligomeric fraction of procyanidins (OFP) > tetramer > trimer > dimer B3 procyanidins. Thus a relationship between higher molecular weight and binding ability was observed. The interaction between these molecules and the enzyme occurs by a static mechanism, as inferred from the high apparent fluorescence and bimolecular quenching constants. A blue shift in the maximal emission wavelength could be seen, which indicates that the tryptophan residues acquire a more hydrophobic character upon procyanidin binding. Molecular docking and dynamics simulations also demonstrate that the SASA (solvent-accessible surface area) values of tryptophans decrease with the binding of these compounds, preventing the accessibility of water molecules, which agrees with the referred blue shift. Circular dichroism studies indicate a decrease in alpha-helix content, followed by an increase in the beta-sheet component of secondary structures of this enzyme. DLS and nephelometry techniques also indicate a relationship between large procyanidins and aggregate formation ability.
Collapse
|
22
|
Abstract
As one of the most prevalent cancers, prostate cancer has enormous public health significance and prevention strategies would attenuate its economic, emotional, physical and social impact. Until recently, however, we have had only modest information about risk factors for this disease, apart from the well-established characteristics of age, family history and place of birth. The large worldwide variation in the incidence of prostate cancer and the increased risk in migrants who move from low-risk to high-risk countries provide strong support for modifiable environmental factors, particularly diet, in its etiology. Thus, dietary agents have gained considerable attention as chemopreventive agents against prostate cancer. Dietary fat, red and processed meat, vitamin E, selenium, tomatoes, cruciforms and green tea have all been linked with the development and aggressiveness of prostate cancer, through a range of molecular mechanisms. The direction of future clinical trials lies in clarifying the effects of these agents and exploring the biological mechanisms responsible for the prevention of prostate cancer. However, owing to the short time period between diagnosis and treatment, conventional dietary intervention techniques are not always realistic. Until large randomized trials confirm the benefit of chemopreventive and dietary modifications, patients can be advised to pursue a diet and lifestyle that enhances overall health.
Collapse
|
23
|
Kallikrein-related peptidases: bridges between immune functions and extracellular matrix degradation. Biol Chem 2010; 391:321-31. [PMID: 20180637 DOI: 10.1515/bc.2010.036] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Kallikrein-related peptidases (KLKs) constitute a family of 15 highly conserved serine proteases encoded by the largest uninterrupted cluster of protease-encoding genes within the human genome. Recent studies, mostly relying on in vitro proteolysis of recombinant proteins, have suggested that KLK activities are regulated by proteolytic activation cascades that can operate in a tissue-specific manner, such as the semen liquefaction and skin desquamation cascades. The validity of KLK activation cascades in vivo largely remains to be demonstrated. Here, we focus on recent investigations showing that KLKs represent interesting players in the broader field of immunology based on their ability to bridge their inherent ability to degrade the extracellular matrix with major functions of the immune system. More specifically, KLKs assist in the infiltration of immune cells through the skin and the blood brain barrier, whereas they catalyze the generation of antimicrobial peptides by proteolytic activation and further processing of protein precursors. In an attempt to integrate current knowledge, we propose KLK-mediated pathways that are putatively involved in inflammation associated with skin wounding and central nervous system disorders, including multiple sclerosis. Finally, we present evidence of KLK participation in autoimmune diseases and allergies.
Collapse
|
24
|
Khan N, Adhami VM, Mukhtar H. Review: green tea polyphenols in chemoprevention of prostate cancer: preclinical and clinical studies. Nutr Cancer 2010; 61:836-41. [PMID: 20155624 DOI: 10.1080/01635580903285056] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The prevention of prostate cancer (PCa) is a crucial medical challenge in developed countries. PCa remains surrounded by puzzles in spite of the considerable progress in research, diagnosis, and treatment. It is an ideal target for chemoprevention, as clinically significant PCa usually requires more than two decades for development. Green tea and its major constituent epigallocatechin gallate (EGCG) have been extensively studied as a potential treatment for a variety of diseases including cancer. In this review, we highlight the evidences of green tea polyphenols from preclinical and clinical studies in the chemoprevention/chemotherapy of PCa.
Collapse
Affiliation(s)
- Naghma Khan
- Department of Dermatology, University of Wisconsin, Madison, Wisconsin 53706, USA
| | | | | |
Collapse
|
25
|
Hekim C, Riipi T, Zhu L, Laakkonen P, Stenman UH, Koistinen H. Complex formation between human prostate-specific antigen and protease inhibitors in mouse plasma. Prostate 2010; 70:482-90. [PMID: 19937596 DOI: 10.1002/pros.21082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND When secreted from the prostate, most of prostate-specific antigen (PSA) is free and enzymatically active. Upon reaching circulation, active PSA is inactivated by complex formation with protease inhibitors. To justify the use of mouse models for evaluation of the function of PSA and for studies on therapeutic modalities based on modulation of PSA activity, it is important to know whether PSA complexation is similar in mouse and man. METHODS To characterize the circulating forms of PSA in mouse, we used subcutaneous LNCaP and 22RV1 human prostate cancer cell xenograft tumor models. We also added PSA directly to mouse serum. Free and total PSA were measured by immunoassay, and PSA complexes were extracted by immunopurification followed by SDS-PAGE, in-gel trypsin digestion and identification of signature peptides by mass spectrometry. RESULTS In mice bearing xenograft tumors, 68% of the immunoreactive PSA occurred in complex, and when added to mouse serum, over 70% of PSA forms complexes that comprises alpha(2)-macroglobulin and members of the alpha(1)-antitrypsin (AAT) family. CONCLUSION In mouse plasma, PSA forms complexes similar to those in man, but the major immunoreactive complex contains AAT rather than alpha(1)-antichymotrypsin, which is the main complex forming serpin in man. The complex formation of PSA produced by xenograft tumor models in mice is similar to that of human prostate tumors with respect to the complexation of PSA.
Collapse
Affiliation(s)
- Can Hekim
- Department of Clinical Chemistry, Biomedicum Helsinki, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
| | | | | | | | | | | |
Collapse
|
26
|
Identification of prostate-specific antigen (PSA) isoforms in complex biological samples utilizing complementary platforms. J Proteomics 2010; 73:1137-47. [PMID: 20102753 DOI: 10.1016/j.jprot.2010.01.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Revised: 12/10/2009] [Accepted: 01/16/2010] [Indexed: 11/20/2022]
Abstract
Measurements of the prostate-specific antigen (PSA) levels in blood are widely used as diagnostic, predictive and prognostic marker of prostate disease. The selective detection of molecular forms of PSA can contribute clinically to meaningful enhancements of the conventional PSA-test. As it is plausible that an in-depth search for structural variants of PSA gene products may increase our ability to discriminate distinct patho-biological basis and stages of prostate diseases, we have developed a multi-step protocol comprising gel-based methods followed by mass spectrometric identification. Our current aim was to provide a comprehensive identification of PSA variants occurring in seminal fluid. We provide a proof-of-principle for this multiple step analytical approach to identify multiple PSA variants from complex biological samples that revealed distinct molecular characteristics. In addition, sequence-annotated protein bands in SDS-PAGE gels were compared to those detected by Western blots, and by monitoring the enzymatic activity in zymogram gels, using gelatin as a substrate. The high accuracy annotations were obtained by fast turnaround MALDI-Orbitrap analysis from excised and digested gel bands. Multiple PSA forms were identified utilizing a combination of MASCOT and SEQUEST search engines.
Collapse
|
27
|
Mattsson JM, Laakkonen P, Stenman UH, Koistinen H. Antiangiogenic properties of prostate-specific antigen (PSA). Scandinavian Journal of Clinical and Laboratory Investigation 2009; 69:447-51. [PMID: 19551556 DOI: 10.1080/00365510903056031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The prostate produces high levels of prostate-specific antigen (PSA, also known as kallikrein-related peptidase 3, KLK3), which is a potential target for tumor imaging and treatment. Although serum PSA levels are elevated in prostate cancer, PSA expression is lower in malignant than in normal prostatic epithelium and it is further reduced in poorly differentiated tumors. PSA has been shown to inhibit angiogenesis both in in vitro and in vivo models. In this review we focus on our recent studies concerning the mechanism of the antiangiogenic function of PSA. We have recently shown that the antiangiogenic activity of PSA is related to its enzymatic activity. Inactive PSA isoforms do not have antiangiogenic activity as studied by a human umbelical vein endothelial cell (HUVEC) tube formation model. Furthermore, inhibition of PSA, either by a monoclonal antibody or small molecule inhibitors abolishes the effect of PSA, while a peptide that stimulates the activity of PSA enhances the antiangiogenic effect. We have analyzed changes in gene expression associated with the PSA induced reduction of tube formation in the HUVEC model. Several small changes were observed and they were found to be opposite to those associated with tube formation. Taken together, these studies suggest that PSA exerts antiantiogenic activity related to its enzymatic activity. Thus it might be associated with the slow growth of prostate cancer.
Collapse
Affiliation(s)
- Johanna M Mattsson
- Department of Clinical Chemistry, Biomedicum, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland.
| | | | | | | |
Collapse
|
28
|
Adhami VM, Mukhtar H. Polyphenols from green tea and pomegranate for prevention of prostate cancer. Free Radic Res 2009; 40:1095-104. [PMID: 17015254 DOI: 10.1080/10715760600796498] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Prostate cancer (PCa) is the most common non-cutaneous cancer diagnosed in North America with similar trends in many Western countries. Geographic, epidemiological and laboratory studies suggest a role for dietary constituents in the etiology as well as prevention of PCa. The rising incidence of PCa in several countries appears to be coincidental with adoption of western lifestyle. Increase in the incidence of PCa has also been found in Asian populations migrating to the west. These facts give numerous leads to explore testable PCa prevention strategies. There is growing evidence in support of use of dietary ingredients in prevention and treatment of PCa. While substantial data exists in favor of use of polyphenols from tea as PCa chemopreventive agent, interest in anti-cancer properties of polyphenols from pomegranate has recently emerged. This review summarizes current literature on the effects of polyphenols from green tea and pomegranate against PCa.
Collapse
Affiliation(s)
- Vaqar M Adhami
- Department of Dermatology, University of Wisconsin-Madison, Madison, WI 53706, USA
| | | |
Collapse
|
29
|
Huang C, Chen Y, Zhou T, Chen G. Sulfation of dietary flavonoids by human sulfotransferases. Xenobiotica 2009; 39:312-22. [PMID: 19350454 DOI: 10.1080/00498250802714915] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Dietary flavonoids catechin, epicatechin, eriodictyol, and hesperetin were investigated as substrates and inhibitors of human sulfotransferases (hSULTs). Purified recombinant proteins and human intestine cytosol were used as enzyme sources. hSULT1A1 and hSULT1A3 as well as human intestine cytosol can catalyse the sulfation of the investigated flavonoids. Sulfation of catechin, epicatechin, eriodictyol, and hesperetin by recombinant hSULTs showed substrate inhibition at high flavonoid concentrations. Hesperetin and eriodictyol are potent inhibitors of purified hSULT1A1, hSULT1A3, hSULT1E1, and hSULT2A1. Catechin and epicatechin inhibited hSULT1A1 and hSULT1A3, but not hSULT1E1 and hSULT2A1. The sulfation efficacy and potency of inhibition is related to the C-ring structure of flavonoids. These results suggest that dietary flavonoids may regulate human SULT activity and, therefore, affect the regulation of hormones and neurotransmitters, detoxification of drugs, and the bioactivation of pro- carcinogens and pro-mutagens.
Collapse
Affiliation(s)
- C Huang
- Physiological Sciences, Oklahoma State University, Stillwater, OK 74078, USA
| | | | | | | |
Collapse
|
30
|
Green tea (−)-epigallocatechin-3-gallate down-regulates VASP expression and inhibits breast cancer cell migration and invasion by attenuating Rac1 activity. Eur J Pharmacol 2009; 606:172-9. [DOI: 10.1016/j.ejphar.2008.12.033] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 12/07/2008] [Accepted: 12/18/2008] [Indexed: 02/01/2023]
|
31
|
Neves D, Assunção M, Marques F, Andrade JP, Almeida H. Does regular consumption of green tea influence expression of vascular endothelial growth factor and its receptor in aged rat erectile tissue? Possible implications for vasculogenic erectile dysfunction progression. AGE (DORDRECHT, NETHERLANDS) 2008; 30:217-228. [PMID: 19424845 PMCID: PMC2585648 DOI: 10.1007/s11357-008-9051-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2007] [Accepted: 02/29/2008] [Indexed: 05/27/2023]
Abstract
Erectile dysfunction (ED) is a highly prevalent disease affecting millions of men worldwide with a tendency for widespread increase. ED is now considered an early manifestation of atherosclerosis and, consequently, a precursor of systemic vascular disease. Atherosclerosis and ED share potentially modifiable risk factors, as smoking or high-fat food intake, but it is unclear how regular consumption of anti-oxidant rich drinks, which exhibit recognised anti-atherosclerotic features, affects ED progression. The objective of this study was to evaluate the modulating effects of chronic consumption of catechin-rich beverages on the vascular structure of the rat corpus cavernosum, and how this could contribute to delay or prevention of the onset of ED. Male Wistar rats aged 12 months were treated with green tea (GT) or a green tea extract solution (GTE) as the only liquid source for 6 months. Consumption of GT and GTE led to decreased plasma androgen levels without any significant change in plasma lipid levels. A reduction in corpus cavernosum intracellular storage of lipids, associated with decreased expression of vascular endothelial growth factor (VEGF) and its receptor VEGFR2 in endothelial cells, was observed. Taken together, these results suggest diminished atherosclerotic progression in cavernous tissue. However, functional studies will be necessary to elucidate if catechin-rich beverages are useful compounds in the prevention of deleterious vascular events associated with ED. It was also demonstrated that regular consumption of catechins reduces atherosclerotic progression and mortality due to cardiovascular disease. The results reported here suggest diminished atherosclerotic progression in cavernous tissue in aged rats following chronic ingestion of catechin-rich beverages.
Collapse
Affiliation(s)
- D Neves
- Laboratory for Molecular Cell Biology, Faculty of Medicine and IBMC, University of Porto, Al. Prof. Hernâni Monteiro, 4200-319, Porto, Portugal.
| | | | | | | | | |
Collapse
|
32
|
Chuu CP, Chen RY, Kokontis JM, Hiipakka RA, Liao S. Suppression of androgen receptor signaling and prostate specific antigen expression by (-)-epigallocatechin-3-gallate in different progression stages of LNCaP prostate cancer cells. Cancer Lett 2008; 275:86-92. [PMID: 18977589 DOI: 10.1016/j.canlet.2008.10.001] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Revised: 10/01/2008] [Accepted: 10/02/2008] [Indexed: 11/25/2022]
Abstract
The green tea polyphenol, (-)-epigallocatechin-3-gallate (EGCG), inhibits the development and progression of prostate cancer in TRAMP mice and in men. We examined the effects of EGCG on LNCaP human prostate cancer sublines 104-S, 104-R1 and R1Ad representing different progression stages of prostate cancer. EGCG suppressed cell proliferation, prostate specific antigen (PSA) expression, and AR transcriptional activity in the different LNCaP sublines. Intraperitoneal administration of EGCG also suppressed the growth of relapsing R1Ad tumors and decreased tumor-derived serum PSA. Effects of EGCG on tumor PSA expression have the potential to affect accurate monitoring of patient tumor burden by serum PSA measurements.
Collapse
Affiliation(s)
- Chih-Pin Chuu
- The Ben May Department for Cancer Research, The University of Chicago, 929 East 57th Street, CIS W325F, Chicago, IL 60637, USA.
| | | | | | | | | |
Collapse
|
33
|
Koistinen H, Närvänen A, Pakkala M, Hekim C, Mattsson JM, Zhu L, Laakkonen P, Stenman UH. Development of peptides specifically modulating the activity of KLK2 and KLK3. Biol Chem 2008; 389:633-42. [PMID: 18627344 DOI: 10.1515/bc.2008.076] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The prostate produces several proteases, the most abundant ones being kallikrein-related peptidase 3 (KLK3, PSA) and KLK2 (hK2), which are potential targets for tumor imaging and treatment. KLK3 expression is lower in malignant than in normal prostatic epithelium and it is further reduced in poorly differentiated tumors, in which the expression of KLK2 is increased. KLK3 has been shown to inhibit angiogenesis, whereas KLK2 may mediate tumor growth and invasion by participating in proteolytic cascades. Thus, it may be possible to control prostate cancer growth by modulating the proteolytic activity of KLK3 and KLK2. We have developed peptides that very specifically stimulate the activity of KLK3 or inhibit that of KLK2. Using these peptides we have established peptide-based methods for the determination of enzymatically active KLK3. The first-generation peptides are unstable in vivo and are rapidly cleared from the circulation. Currently we are modifying the peptides to make them suitable for in vivo applications. We have been able to considerably improve the stability of KLK2-binding peptides by cyclization. In this review we summarize the possible roles of KLK3 and KLK2 in prostate cancer and then concentrate on the development of peptides that modulate the activity of these proteases.
Collapse
Affiliation(s)
- Hannu Koistinen
- Department of Clinical Chemistry, Biomedicum Helsinki, University of Helsinki and Helsinki University Central Hospital, 00014 Helsinki, Finland.
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Mattsson JM, Laakkonen P, Kilpinen S, Stenman UH, Koistinen H. Gene expression changes associated with the anti-angiogenic activity of kallikrein-related peptidase 3 (KLK3) on human umbilical vein endothelial cells. Biol Chem 2008; 389:765-71. [DOI: 10.1515/bc.2008.088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractKallikrein-related peptidase 3 (KLK3, also known as prostate-specific antigen, PSA) is a chymotrypsin-like kallikrein that has anti-angiogenic properties. We have previously shown in a human umbilical vein endothelial cell (HUVEC) model that the anti-angiogenic effect of KLK3 is related to its enzyme activity. However, the mechanism of this effect remains to be clarified. To this end, we used a DNA microarray to study KLK3-induced changes in gene expression associated with reduction of HUVEC tube formation. Among the 41 000 genes studied, 311 were differentially expressed between control and KLK3-treated cells. These changes were enriched in several pathways, including those associated with proteasome, ubiquitin-mediated proteolysis, focal adhesion and regulation of the actin cytoskeleton. Furthermore, the changes were opposite to those previously described to occur during tubulogenesis. In conclusion, our results show that KLK3 induces gene expression changes in HUVECs. Although these changes might be relevant for the mechanism by which KLK3 exerts its anti-angiogenic activity, it cannot be judged from the present results whether they reflect the primary mechanism mediating the effect of KLK3 or are secondary to morphogenic differentiation.
Collapse
|
35
|
Huber A, Thongphasuk P, Erben G, Lehmann WD, Tuma S, Stremmel W, Chamulitrat W. Significantly greater antioxidant anticancer activities of 2,3-dehydrosilybin than silybin. Biochim Biophys Acta Gen Subj 2008; 1780:837-47. [DOI: 10.1016/j.bbagen.2007.12.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Revised: 12/13/2007] [Accepted: 12/14/2007] [Indexed: 12/29/2022]
|
36
|
Bhat TA, Singh RP. Tumor angiogenesis – A potential target in cancer chemoprevention. Food Chem Toxicol 2008; 46:1334-45. [DOI: 10.1016/j.fct.2007.08.032] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2007] [Revised: 07/06/2007] [Accepted: 08/22/2007] [Indexed: 01/11/2023]
|
37
|
|
38
|
Syed DN, Khan N, Afaq F, Mukhtar H. Chemoprevention of Prostate Cancer through Dietary Agents: Progress and Promise. Cancer Epidemiol Biomarkers Prev 2007; 16:2193-203. [DOI: 10.1158/1055-9965.epi-06-0942] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
39
|
Yu HN, Shen SR, Yin JJ. Effects of Metal Ions, Catechins, and Their Interactions on Prostate Cancer. Crit Rev Food Sci Nutr 2007; 47:711-9. [DOI: 10.1080/10408390600948873] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
40
|
Khan N, Mukhtar H. Tea polyphenols for health promotion. Life Sci 2007; 81:519-33. [PMID: 17655876 PMCID: PMC3220617 DOI: 10.1016/j.lfs.2007.06.011] [Citation(s) in RCA: 651] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Revised: 06/01/2007] [Accepted: 06/18/2007] [Indexed: 02/08/2023]
Abstract
People have been consuming brewed tea from the leaves of the Camellia sinensis plant for almost 50 centuries. Although health benefits have been attributed to tea, especially green tea consumption since the beginning of its history, scientific investigations of this beverage and its constituents have been underway for less than three decades. Currently, tea, in the form of green or black tea, next to water, is the most widely consumed beverage in the world. In vitro and animal studies provide strong evidence that polyphenols derived from tea may possess the bioactivity to affect the pathogenesis of several chronic diseases. Among all tea polyphenols, epigallocatechin-3-gallate has been shown to be responsible for much of the health promoting ability of green tea. Tea and tea preparations have been shown to inhibit tumorigenesis in a variety of animal models of carcinogenesis. However, with increasing interest in the health promoting properties of tea and a significant rise in scientific investigation, this review covers recent findings on the medicinal properties and health benefits of tea with special reference to cancer and cardiovascular diseases.
Collapse
Affiliation(s)
| | - Hasan Mukhtar
- Author for correspondence: Hasan Mukhtar, Ph.D., Helfaer Professor of Cancer Research, Director and Vice Chair of Research, Department of Dermatology, University of Wisconsin-Madison, 1300, University Avenue, Medical Sciences Center, B-25, Madison, WI, 53706., Phone: 608-263-3927, Fax: 608-263-5223,
| |
Collapse
|
41
|
Pampalakis G, Sotiropoulou G. Tissue kallikrein proteolytic cascade pathways in normal physiology and cancer. Biochim Biophys Acta Rev Cancer 2007; 1776:22-31. [PMID: 17629406 DOI: 10.1016/j.bbcan.2007.06.001] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2007] [Revised: 06/02/2007] [Accepted: 06/04/2007] [Indexed: 11/23/2022]
Abstract
Human tissue kallikreins (KLKs or kallikrein-related peptidases) are a subgroup of extracellular serine proteases that act on a wide variety of physiological substrates, while they display aberrant expression patterns in certain types of cancer. Differential expression patterns lead to the exploitation of these proteins as new cancer biomarkers for hormone-dependent malignancies, in particular. The prostate-specific antigen or kallikrein-related peptidase 3 (PSA/KLK3) is an established tumor marker for the diagnosis and monitoring of prostate cancer. It is well documented that specific KLK genes are co-expressed in tissues and in various pathologies suggesting their participation in complex proteolytic cascades. Here, we review the currently established knowledge on the involvement of KLK proteolytic cascades in the regulation of physiological and pathological processes in prostate tissue and in skin. It is well established that the activity of KLKs is often regulated by auto-activation and subsequent autolytic internal cleavage leading to enzymatic inactivation, as well as by inhibitory serpins or by allosteric inhibition by zinc ions. Redistribution of zinc ions and alterations in their concentration due to physiological or pathological reasons activates specific KLKs initiating the kallikrein cascade(s). Recent studies on kallikrein substrate specificity allowed for the construction of a kallikrein interaction network involved in semen liquefaction and prostate cancer, as well as in skin pathologies, such as skin desquamation, psoriasis and cancer. Furthermore, we discuss the crosstalks between known proteolytic pathways and the kallikrein cascades, with emphasis on the activation of plasmin and its implications in prostate cancer. These findings may have clinical implications for the underlying molecular mechanism and management of cancer and other disorders in which KLK activity is elevated.
Collapse
|
42
|
Griffiths K, Prezioso D, Turkes A, Denis LJ. The prevention of prostate cancer. RECENT RESULTS IN CANCER RESEARCH. FORTSCHRITTE DER KREBSFORSCHUNG. PROGRES DANS LES RECHERCHES SUR LE CANCER 2007; 175:33-63. [PMID: 17432553 DOI: 10.1007/978-3-540-40901-4_4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
From our better understanding of the natural history of prostate cancer, it is not unreasonable to believe that the disease is preventable. Prostate cancer has become a major healthcare problem worldwide, as life expectancy increases. Moreover, the cancer is slow growing, with a period of about 20-25 years from initiation to the stage when the clinically detectable phenotype can be identified. This review provides a simple overview of the endocrinology of prostate cancer and discusses some of the pharmaceutical agents that have been or are being tested to restrain, possibly arrest, the progression of this slowly growing cancer. Also discussed are many of the dietary factors that may influence the molecular or endocrine events implicated in its development. Dietary factors are considered responsible for the geographical differences in prostate cancer incidence and mortality. Since about 50% of all men worldwide, from both East and West, show evidence of microscopic cancer by 50 years of age, growth restraint would appear to be the pragmatic option to the possibility of preventing initiation.
Collapse
|
43
|
Abstract
PURPOSE OF REVIEW An increasing volume of research has been directed at the prevention of prostate cancer. This review proposes to summarize the large trials, novel approaches and molecular mechanisms of effect published in 2004 and 2005. RECENT FINDINGS The impact of the Prostate Cancer Prevention Trial continues and subsequent articles have addressed the increase of high-grade prostate cancers detected in the finasteride arm of the trial, as well as the potential costs and benefits of extrapolating the findings to a public health campaign. Studies of risk have been published warning of excessive vitamin E and cyclooxygenase-2 inhibitor use in chemoprevention. Growing evidence supports the concept of chemopreventative agent combinations and further data on the roles of selenium, lycopene, soy, green tea, anti-inflammatories and statins in prostate-cancer prevention are presented. SUMMARY Level one evidence exists for the preventative effects of finasteride in prostate cancer. The evidence for other agents is less conclusive but a number of large-scale, appropriately designed trials will hopefully address some of the relevant issues in prostate-cancer prevention over the next decade.
Collapse
Affiliation(s)
- Mischel G Neill
- Division of UroOncology, University Health Network, Toronto, Ontario, Canada
| | | |
Collapse
|
44
|
Spinella F, Rosanò L, Di Castro V, Decandia S, Albini A, Nicotra MR, Natali PG, Bagnato A. Green tea polyphenol epigallocatechin-3-gallate inhibits the endothelin axis and downstream signaling pathways in ovarian carcinoma. Mol Cancer Ther 2006; 5:1483-92. [PMID: 16818507 DOI: 10.1158/1535-7163.mct-06-0053] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The polyphenol epigallocatechin-3-gallate (EGCG), the principal mediator of the green tea, has been known to possess antitumor effect. The endothelin A receptor (ET(A)R)/endothelin-1 (ET-1) axis is overexpressed in ovarian carcinoma representing a novel therapeutic target. In this study, we examined the green tea and EGCG effects on two ovarian carcinoma cell lines, HEY and OVCA 433. EGCG inhibited ovarian cancer cell growth and induced apoptosis that was associated with a decrease in Bcl-X(L) expression and activation of caspase-3. Treatment with green tea or EGCG inhibited ET(A)R and ET-1 expression and reduced the basal and ET-1-induced cell proliferation and invasion. The EGCG-induced inhibitory effects were associated with a decrease of ET(A)R-dependent activation of the p42/p44 and p38 mitogen-activated protein kinases and phosphatidylinositol 3-kinase pathway. Remarkably, EGCG treatment resulted in a lowering of basal and ET-1-induced angiogenesis and invasiveness mediators, such as vascular endothelial growth factor and tumor proteinase activation. Finally, in HEY ovarian carcinoma xenografts, tumor growth was significantly inhibited by oral administration of green tea. This effect was associated with a reduction in ET-1, ET(A)R, and vascular endothelial growth factor expression, microvessel density, and proliferation index. These results provide a novel insight into the mechanism by which EGCG, affecting multiple ET(A)R-dependent pathways, may inhibit ovarian carcinoma growth, suggesting that EGCG may be useful in preventing and treating ovarian carcinoma in which ET(A)R activation by ET-1 plays a critical role in tumor growth and progression.
Collapse
Affiliation(s)
- Francesca Spinella
- Laboratory of Molecular Pathology and Ultrastructure, Regina Elena Cancer Institute, Via delle Messi d'Oro, 156, 00158 Rome, Italy
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Siddiqui IA, Zaman N, Aziz MH, Reagan-Shaw SR, Sarfaraz S, Adhami VM, Ahmad N, Raisuddin S, Mukhtar H. Inhibition of CWR22Rnu1 tumor growth and PSA secretion in athymic nude mice by green and black teas. Carcinogenesis 2005; 27:833-9. [PMID: 16387739 DOI: 10.1093/carcin/bgi323] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cancer of the prostate gland (CaP), the most common invasive malignancy and a major cause of cancer related deaths in male population in the USA, is an ideal candidate disease for chemoprevention because it is typically detected in elderly population with a relatively slower rate of growth and progression. Many dietary phytochemicals are showing promising chemopreventive effects, at-least in pre-clinical models of CaP. Our published data in cell culture and animal studies, supported by the work from other laboratories, as well as epidemiological observations and case-control studies, suggest that polyphenols present in green tea possess CaP chemopreventive and possibly therapeutic effects. This present study was designed to compare CaP cancer chemopreventive effects of green tea polyphenols (GTP), water extract of black tea, and their major constituents epigallocatechin-3-gallate and theaflavins, respectively, in athymic nude mice implanted with androgen-sensitive human CaP CWR22Rnu1 cells. Our data demonstrated that the treatment with all the tea ingredients resulted in (i) significant inhibition in growth of implanted prostate tumors, (ii) reduction in the level of serum prostate specific antigen, (iii) induction of apoptosis accompanied with upregulation in Bax and decrease in Bcl-2 proteins, and (iv) decrease in the levels of VEGF protein. Furthermore, we also found that GTP (0.01 or 0.05% w/v; given after establishment of CWR22Rnu1 tumor) causes a significant regression of tumors suggesting therapeutic effects of GTP at human achievable concentrations.
Collapse
Affiliation(s)
- Imtiaz A Siddiqui
- Department of Dermatology, University of Wisconsin-Madison, WI 53706, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
|