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Torequl Islam M, Shimul Bhuia M, Paulo Martins de Lima J, Paulo Araujo Maia F, Beatriz Herminia Ducati A, Douglas Melo Coutinho H. Phytanic acid, an inconclusive phytol metabolite: A review. Curr Res Toxicol 2023; 5:100120. [PMID: 37744206 PMCID: PMC10515296 DOI: 10.1016/j.crtox.2023.100120] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/28/2023] [Accepted: 08/30/2023] [Indexed: 09/26/2023] Open
Abstract
Phytanic acid (PA: 3,7,11,15-tetramethylhexadecanoic acid) is an important biometabolite of the chlorophyll-derived diterpenoid phytol. Its biological sources (occurrence) and ADME (absorption, distribution, metabolism, and elimination) profile are well-discussed in the literature. Cumulative literature suggests that PA has beneficial as well as harmful biological roles in humans and other animals. This study aimed to sketch a brief summary of PA's beneficial and harmful pharmacological effects in test systems on the basis of existing literature reports. Literature findings propose that PA has anti-inflammatory and immunomodulatory, antidiabetic, anti-obesity, anticancer, and oocyte maturation effects. Although a high plasma PA-level mediated SLS remains controversial, it is evident to link it with Refsum's disease and other peroxisomal enzyme deficiency diseases in humans, including RCDP and LD; ZHDA and Alzheimer's disease; progressive ataxia and dysarthria; and an increased risk of some lymphomas such as LBL, FL, and NHL. PA exerts toxic effects on different kinds of cells, including neuronal, cardiac, and renal cells, through diverse pathways such as oxidative stress, mitochondrial disturbance, apoptosis, disruption of Na+/K+-ATPase activity, Ca2+ homeostasis, alteration of AChE and MAO activities, etc. PA is considered a cardiac biomarker in humans. In conclusion, PA may be one of the most important biometabolites in humans.
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Affiliation(s)
- Muhammad Torequl Islam
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj 8100, Bangladesh
| | - Md. Shimul Bhuia
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj 8100, Bangladesh
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Sellem L, Jackson KG, Paper L, Givens ID, Lovegrove JA. Can individual fatty acids be used as functional biomarkers of dairy fat consumption in relation to cardiometabolic health? A narrative review. Br J Nutr 2022; 128:2373-2386. [PMID: 35086579 PMCID: PMC9723489 DOI: 10.1017/s0007114522000289] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 10/25/2021] [Accepted: 01/20/2022] [Indexed: 12/30/2022]
Abstract
In epidemiological studies, dairy food consumption has been associated with minimal effect or decreased risk of some cardiometabolic diseases (CMD). However, current methods of dietary assessment do not provide objective and accurate measures of food intakes. Thus, the identification of valid and reliable biomarkers of dairy product intake is an important challenge to best determine the relationship between dairy consumption and health status. This review investigated potential biomarkers of dairy fat consumption, such as odd-chain, trans- and branched-chain fatty acids (FA), which may improve the assessment of full-fat dairy product consumption. Overall, the current use of serum/plasma FA as biomarkers of dairy fat consumption is mostly based on observational evidence, with a lack of well-controlled, dose-response intervention studies to accurately assess the strength of the relationship. Circulating odd-chain SFA and trans-palmitoleic acid are increasingly studied in relation to CMD risk and seem to be consistently associated with a reduced risk of type 2 diabetes in prospective cohort studies. However, associations with CVD are less clear. Overall, adding less studied FA such as vaccenic and phytanic acids to the current available evidence may provide a more complete assessment of dairy fat intake and minimise potential confounding from endogenous synthesis. Finally, the current evidence base on the direct effect of dairy fatty acids on established biomarkers of CMD risk (e.g. fasting lipid profiles and markers of glycaemic control) mostly derives from cross-sectional, animal and in vitro studies and should be strengthened by well-controlled human intervention studies.
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Affiliation(s)
- Laury Sellem
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Science, University of Reading, Whiteknights, Pepper Lane, Reading, RG6 6DZ, UK
- Institute for Food, Nutrition and Health, University of Reading, Reading, UK
| | - Kim G. Jackson
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Science, University of Reading, Whiteknights, Pepper Lane, Reading, RG6 6DZ, UK
- Institute for Food, Nutrition and Health, University of Reading, Reading, UK
| | - Laura Paper
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Science, University of Reading, Whiteknights, Pepper Lane, Reading, RG6 6DZ, UK
- Institute for Food, Nutrition and Health, University of Reading, Reading, UK
| | - Ian D. Givens
- Institute for Food, Nutrition and Health, University of Reading, Reading, UK
| | - Julie A. Lovegrove
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Science, University of Reading, Whiteknights, Pepper Lane, Reading, RG6 6DZ, UK
- Institute for Food, Nutrition and Health, University of Reading, Reading, UK
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Ubago-Guisado E, Rodríguez-Barranco M, Ching-López A, Petrova D, Molina-Montes E, Amiano P, Barricarte-Gurrea A, Chirlaque MD, Agudo A, Sánchez MJ. Evidence Update on the Relationship between Diet and the Most Common Cancers from the European Prospective Investigation into Cancer and Nutrition (EPIC) Study: A Systematic Review. Nutrients 2021; 13:nu13103582. [PMID: 34684583 PMCID: PMC8540388 DOI: 10.3390/nu13103582] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 09/30/2021] [Accepted: 10/11/2021] [Indexed: 12/13/2022] Open
Abstract
The European Prospective Investigation into Cancer and Nutrition (EPIC) is a multicentre prospective study conducted in 23 centres in 10 European countries. Here we review the findings from EPIC on the relationship between diet-related exposures and incidence or mortality from the four most frequent cancers in the European population: colorectal, breast, lung, and prostate cancer. We conducted a systematic review following PRISMA guidelines and identified 110 high-quality studies based on the EPIC cohort. Fruit and vegetable consumption had a protective effect against colorectal, breast, and lung cancer, whereas only fruit had a protective effect against prostate cancer. A higher consumption of fish and lower consumption of red and processed meat were related with a lower risk of colorectal cancer; and higher consumption of fatty fish with lower risk of breast cancer. Calcium and yogurt intake were found to protect against colorectal and prostate cancer. Alcohol consumption increased the risk for colorectal and breast cancer. Finally, adherence to the Mediterranean diet emerged as a protective factor for colorectal and breast cancer. The EPIC study results are in agreement with the latest evidence from leading authorities on cancer prevention and help to inform public prevention policies and strategies.
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Affiliation(s)
- Esther Ubago-Guisado
- Cancer Registry of Granada, Escuela Andaluza de Salud Pública, 18011 Granada, Spain; (E.U.-G.); (A.C.-L.); (D.P.); (M.-J.S.)
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
| | - Miguel Rodríguez-Barranco
- Cancer Registry of Granada, Escuela Andaluza de Salud Pública, 18011 Granada, Spain; (E.U.-G.); (A.C.-L.); (D.P.); (M.-J.S.)
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Correspondence:
| | - Ana Ching-López
- Cancer Registry of Granada, Escuela Andaluza de Salud Pública, 18011 Granada, Spain; (E.U.-G.); (A.C.-L.); (D.P.); (M.-J.S.)
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
| | - Dafina Petrova
- Cancer Registry of Granada, Escuela Andaluza de Salud Pública, 18011 Granada, Spain; (E.U.-G.); (A.C.-L.); (D.P.); (M.-J.S.)
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Department of Experimental Psychology, Mind, Brain and Behavior Research Center (CIMCYC), University of Granada, 18071 Granada, Spain
| | - Esther Molina-Montes
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Department of Nutrition and Food Science, Campus of Cartuja, University of Granada, 18071 Granada, Spain
- Institute of Nutrition and Food Technology (INYTA) ‘José Mataix’, Biomedical Research Centre, University of Granada, Avenida del Conocimiento s/n, E-18071 Granada, Spain
| | - Pilar Amiano
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Public Health Division of Gipuzkoa, BioDonostia Research Institute, 20014 Donostia-San Sebastian, Spain
| | - Aurelio Barricarte-Gurrea
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Navarra Public Health Institute, 31008 Pamplona, Spain
- Navarra Institute for Health Research (IdiSNA), 31008 Pamplona, Spain
| | - María-Dolores Chirlaque
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Department of Epidemiology, Regional Health Council, IMIB-Arrixaca, Murcia University, 30003 Murcia, Spain
| | - Antonio Agudo
- Unit of Nutrition and Cancer, Catalan Institute of Oncology—ICO, 08908 L’Hospitalet de Llobregat, Spain;
- Nutrition and Cancer Group, Epidemiology, Public Health, Cancer Prevention and Palliative Care Program, Bellvitge Biomedical Research Institute—IDIBELL, 08908 L’Hospitalet de Llobregat, Spain
| | - María-José Sánchez
- Cancer Registry of Granada, Escuela Andaluza de Salud Pública, 18011 Granada, Spain; (E.U.-G.); (A.C.-L.); (D.P.); (M.-J.S.)
- Epidemiology and Control of Chronic Diseases, CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain; (E.M.-M.); (P.A.); (A.B.-G.); (M.-D.C.)
- Cancer Epidemiology Group, Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Department of Preventive Medicine and Public Health, University of Granada, 18071 Granada, Spain
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Barbosa J, Souza J, Herbster C, Silva L, Carvalho J, Medeiros A, Marcondes M, Bezerra L, Oliveira R, Alves S, Bessa R, Pereira E. Basal diets with different starch contents do not modify the metabolism of ricinoleic acid in dairy goats. Anim Feed Sci Technol 2021. [DOI: 10.1016/j.anifeedsci.2021.114900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Perez‐Cornago A, Huybrechts I, Appleby PN, Schmidt JA, Crowe FL, Overvad K, Tjønneland A, Kühn T, Katzke V, Trichopoulou A, Karakatsani A, Peppa E, Grioni S, Palli D, Sacerdote C, Tumino R, Bueno‐de‐Mesquita HB, Larrañaga N, Sánchez M, Quirós JR, Ardanaz E, Chirlaque M, Agudo A, Bjartell A, Wallström P, Chajes V, Tsilidis KK, Aune D, Riboli E, Travis RC, Key TJ. Intake of individual fatty acids and risk of prostate cancer in the European prospective investigation into cancer and nutrition. Int J Cancer 2020; 146:44-57. [PMID: 30807653 PMCID: PMC6899744 DOI: 10.1002/ijc.32233] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 02/11/2019] [Accepted: 02/13/2019] [Indexed: 01/17/2023]
Abstract
The associations of individual dietary fatty acids with prostate cancer risk have not been examined comprehensively. We examined the prospective association of individual dietary fatty acids with prostate cancer risk overall, by tumor subtypes, and prostate cancer death. 142,239 men from the European Prospective Investigation into Cancer and Nutrition who were free from cancer at recruitment were included. Dietary intakes of individual fatty acids were estimated using center-specific validated dietary questionnaires at baseline and calibrated with 24-h recalls. Multivariable Cox regression models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs). After an average follow-up of 13.9 years, 7,036 prostate cancer cases and 936 prostate cancer deaths were ascertained. Intakes of individual fatty acids were not related to overall prostate cancer risk. There was evidence of heterogeneity in the association of some short chain saturated fatty acids with prostate cancer risk by tumor stage (pheterogeneity < 0.015), with a positive association with risk of advanced stage disease for butyric acid (4:0; HR1SD = 1.08; 95%CI = 1.01-1.15; p-trend = 0.026). There were no associations with fatal prostate cancer, with the exception of a slightly higher risk for those who consumed more eicosenoic acid (22:1n-9c; HR1SD = 1.05; 1.00-1.11; p-trend = 0.048) and eicosapentaenoic acid (20:5n-3c; HR1SD = 1.07; 1.00-1.14; p-trend = 0.045). There was no evidence that dietary intakes of individual fatty acids were associated with overall prostate cancer risk. However, a higher intake of butyric acid might be associated with a higher risk of advanced, whereas intakes of eicosenoic and eicosapentaenoic acids might be positively associated with fatal prostate cancer risk.
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Affiliation(s)
- Aurora Perez‐Cornago
- Cancer Epidemiology Unit, Nuffield Department of Population HealthUniversity of OxfordOxfordUnited Kingdom
| | - Inge Huybrechts
- Dietary Exposure Assessment GroupInternational Agency for Research on CancerLyonFrance
| | - Paul N. Appleby
- Cancer Epidemiology Unit, Nuffield Department of Population HealthUniversity of OxfordOxfordUnited Kingdom
| | - Julie A. Schmidt
- Cancer Epidemiology Unit, Nuffield Department of Population HealthUniversity of OxfordOxfordUnited Kingdom
| | - Francesca L. Crowe
- Institute of Applied Health Research, College of Medical and Dental SciencesUniversity of BirminghamBirminghamUnited Kingdom
| | - Kim Overvad
- Department of Public Health, Section for EpidemiologyAarhus UniversityAarhus CDenmark
| | | | - Tilman Kühn
- Division of Cancer EpidemiologyGerman Cancer Research Center (DKFZ)HeidelbergGermany
| | - Verena Katzke
- Division of Cancer EpidemiologyGerman Cancer Research Center (DKFZ)HeidelbergGermany
| | | | - Anna Karakatsani
- Hellenic Health FoundationAthensGreece
- Department of Pulmonary Medicine, School of MedicineNational and Kapodistrian University of Athens, “ATTIKON” University HospitalHaidariGreece
| | | | - Sara Grioni
- Epidemiology and Prevention UnitFondazione IRCCS Istituto Nazionale dei TumoriMilanItaly
| | - Domenico Palli
- Cancer Risk Factors and Life‐Style Epidemiology UnitInstitute for Cancer Research, Prevention and Clinical Network – ISPROFlorenceItaly
| | - Carlotta Sacerdote
- Unit of Cancer EpidemiologyCittà della Salute e della Scienza University‐Hospital and Center for Cancer Prevention (CPO)TurinItaly
| | - Rosario Tumino
- Department of Cancer Registry and Histopathology"Civic ‐ M.P. Arezzo" Hospital ASPRagusaItaly
| | - H. Bas Bueno‐de‐Mesquita
- Department for Determinants of Chronic Diseases (DCD)National Institute for Public Health and the Environment (RIVM)BilthovenThe Netherlands
- Department of Gastroenterology and HepatologyUniversity Medical CentreUtrechtThe Netherlands
- Department of Epidemiology and Biostatistics, The School of Public HealthImperial College LondonLondonUnited Kingdom
- Department of Social and Preventive Medicine, Faculty of MedicineUniversity of MalayaKuala LumpurMalaysia
| | - Nerea Larrañaga
- Department of Basque Regional HealthPublic Health Division of Gipuzkoa‐BIODONOSTIAGuipúzcoaSpain
- CIBER of Epidemiology and Public HealthMadridSpain
| | - Maria‐Jose Sánchez
- CIBER of Epidemiology and Public HealthMadridSpain
- Escuela Andaluza de Salud Pública, Instituto de Investigación Biosanitaria ibs.GRANADAHospitales Universitarios de Granada/Universidad de GranadaGranadaSpain
| | | | - Eva Ardanaz
- CIBER of Epidemiology and Public HealthMadridSpain
- Navarra Public Health InstitutePamplonaSpain
- IdiSNA, Navarra Institute for Health ResearchPamplonaSpain
| | - María‐Dolores Chirlaque
- CIBER of Epidemiology and Public HealthMadridSpain
- Department of Epidemiology, Regional Health CouncilMurciaSpain
- Department of Health and Social SciencesUniversidad de MurciaMurciaSpain
| | - Antonio Agudo
- Unit of Nutrition and Cancer, Cancer Epidemiology Research ProgramCatalan Institute of Oncology‐IDIBELL. L'Hospitalet de LlobregatBarcelonaSpain
| | - Anders Bjartell
- Department of Translational Medicine, Medical FacultyLund UniversityMalmöSweden
- Department of UrologySkåne University HospitalMalmöSweden
| | - Peter Wallström
- Nutrition Epidemiology Research Group, Department of Clinical SciencesLund UniversityMalmöSweden
- Clinical Research CentreMalmö University HospitalMalmöSweden
| | - Veronique Chajes
- Department of Nutrition and MetabolismInternational Agency for Research on CancerLyonFrance
| | - Konstantinos K. Tsilidis
- Department of Hygiene and EpidemiologyUniversity of Ioannina, School of MedicineIoanninaGreece
- Department of Epidemiology and Biostatistics, School of Public HealthImperial College LondonLondonUnited Kingdom
| | - Dagfinn Aune
- Department of Epidemiology and Biostatistics, School of Public HealthImperial College LondonLondonUnited Kingdom
- Department of NutritionBjørknes University CollegeOsloNorway
- Department of Endocrinology, Morbid Obesity and Preventive MedicineOslo University HospitalOsloNorway
| | - Elio Riboli
- Department of Epidemiology and Biostatistics, School of Public HealthImperial College LondonLondonUnited Kingdom
| | - Ruth C. Travis
- Cancer Epidemiology Unit, Nuffield Department of Population HealthUniversity of OxfordOxfordUnited Kingdom
| | - Timothy J. Key
- Cancer Epidemiology Unit, Nuffield Department of Population HealthUniversity of OxfordOxfordUnited Kingdom
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Phytol and its metabolites phytanic and pristanic acids for risk of cancer: current evidence and future directions. Eur J Cancer Prev 2019; 29:191-200. [PMID: 31436750 PMCID: PMC7012361 DOI: 10.1097/cej.0000000000000534] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This review summarizes the current evidence on the potential role of phytol, a microbial metabolite of chlorophyl A, and its metabolites, phytanic and pristanic acids, in carcinogenesis. Primary food sources in Western diets are the nut skin for phytol and lipids in dairy, beef and fish for its metabolites. Phytol and its metabolites gained interest as dietary compounds for cancer prevention because, as natural ligands of peroxisome proliferator-activated receptor-α and -γ and retinoid X receptor, phytol and its metabolites have provided some evidence in cell culture studies and limited evidence in animal models of anti-carcinogenic, anti-inflammatory and anti-metabolic-syndrome properties at physiological concentrations. However, there may be a narrow range of efficacy, because phytol and its metabolites at supra-physiological concentrations can cause in vitro cytotoxicity in non-cancer cells and can cause morbidity and mortality in animal models. In human studies, evidence for a role of phytol and its metabolites in cancer prevention is currently limited and inconclusive. In short, phytol and its metabolites are potential dietary compounds for cancer prevention, assuming the challenges in preventing cytotoxicity in non-cancer cells and animal models and understanding phytol metabolism can be mitigated.
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Roca-Saavedra P, Mariño-Lorenzo P, Miranda J, Porto-Arias J, Lamas A, Vazquez B, Franco C, Cepeda A. Phytanic acid consumption and human health, risks, benefits and future trends: A review. Food Chem 2017; 221:237-247. [DOI: 10.1016/j.foodchem.2016.10.074] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/29/2016] [Accepted: 10/18/2016] [Indexed: 12/18/2022]
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Phytol in a pharma-medico-stance. Chem Biol Interact 2015; 240:60-73. [DOI: 10.1016/j.cbi.2015.07.010] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 07/01/2015] [Accepted: 07/24/2015] [Indexed: 01/02/2023]
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Kataria Y, Wright M, Deaton RJ, Rueter EE, Rybicki BA, Moser AB, Ananthanrayanan V, Gann PH. Dietary influences on tissue concentrations of phytanic acid and AMACR expression in the benign human prostate. Prostate 2015; 75:200-10. [PMID: 25307752 PMCID: PMC4778716 DOI: 10.1002/pros.22905] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 08/26/2014] [Indexed: 11/07/2022]
Abstract
BACKGROUND Alpha-methylacyl-CoA racemase (AMACR) is an enzyme involved in fatty acid metabolism that is markedly over-expressed in virtually all prostate cancers (PCa), relative to benign tissue. One of AMACR's primary substrates, phytanic acid, is derived predominately from red meat and dairy product consumption. Epidemiological evidence suggests links between dairy/red meat intake, as well as phytanic acid levels, and elevated PCa risk. This study investigates the relationships among dietary intake, serum and tissue concentrations of phytanic acid, and AMACR expression (mRNA and protein) in the histologically benign human prostate. METHODS Men undergoing radical prostatectomy for the treatment of localized disease provided a food frequency questionnaire (n = 68), fasting blood (n = 35), benign fresh frozen prostate tissue (n = 26), and formalin-fixed paraffin-embedded (FFPE) sections (n = 67). Serum and tissue phytanic acid concentrations were obtained by gas chromatography-mass spectrometry. We extracted RNA from epithelial cells using laser capture microdissection and quantified mRNA expression of AMACR and other genes involved in the peroxisomal phytanic acid metabolism pathway via qRT-PCR. Immunohistochemistry for AMACR was performed on FFPE sections and subsequently quantified via digital image analysis. Associations between diet, serum, and tissue phytanic acid levels, as well as AMACR and other gene expression levels were assessed by partial Spearman correlation coefficients. RESULTS High-fat dairy intake was the strongest predictor of circulating phytanic acid concentrations (r = 0.35, P = 0.04). Tissue phytanic acid concentrations were not associated with any dietary sources and were only weakly correlated with serum levels (r = 0.29, P = 0.15). AMACR gene expression was not associated with serum phytanic acid (r = 0.13, P = 0.47), prostatic phytanic acid concentrations (r = 0.03, P = 0.88), or AMACR protein expression (r = -0.16, P = 0.20). CONCLUSIONS Our data underscore the complexity of the relationship between AMACR and its substrates and do not support the unifying hypothesis that excess levels of dietary phytanic acid are responsible for both the overexpression of AMACR in prostate cancer and the potential association between PCa risk and intake of dairy foods and red meat.
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Affiliation(s)
- Yachana Kataria
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois
| | | | - Ryan J. Deaton
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois
| | - Erika Enk Rueter
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois
| | - Benjamin A. Rybicki
- Department of Public Health Sciences, Henry Ford Health Systems, Detroit, Michigan
| | - Ann B. Moser
- Peroxisomal Diseases Lab, Hugo W. Moser Research Institute at Kennedy Krieger, Baltimore, Maryland
| | | | - Peter H. Gann
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois
- Correspondence to: Peter H. Gann, MD, ScD, Department of Pathology (MC 847), College of Medicine, 840 S. Wood Street, Chicago, IL 60612.
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Wright ME, Albanes D, Moser AB, Weinstein SJ, Snyder K, Männistö S, Gann PH. Serum phytanic and pristanic acid levels and prostate cancer risk in Finnish smokers. Cancer Med 2014; 3:1562-9. [PMID: 25132681 PMCID: PMC4298383 DOI: 10.1002/cam4.319] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 07/15/2014] [Accepted: 07/17/2014] [Indexed: 12/15/2022] Open
Abstract
Phytanic acid is a saturated branched-chain fatty acid found predominantly in red meat and dairy products, and may contribute to the elevated risks of prostate cancer associated with higher consumption of these foods. Pristanic acid is formed during peroxisomal oxidation of phytanic acid, and is the direct substrate of α-Methyl-CoA-Racemase (AMACR)--an enzyme that is consistently overexpressed in prostate tumors relative to benign tissue. We measured phytanic and pristanic acids as percentages of total fatty acids by gas chromatography-mass spectrometry in prediagnostic blood samples from 300 prostate cancer cases and 300 matched controls, all of whom were participants in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention (ATBC) Study supplementation trial and follow-up cohort. In addition to providing a fasting blood sample at baseline, all men completed extensive diet, lifestyle, and medical history questionnaires. Among controls, the strongest dietary correlates of serum phytanic and pristanic acids were saturated fat, dairy fat, and butter (r = 0.50 and 0.40, 0.46 and 0.38, and 0.40 and 0.37, respectively; all P-values <0.001). There was no association between serum phytanic acid and risk of total or aggressive prostate cancer in multivariate logistic regression models (for increasing quartiles, odds ratios (OR) and 95% confidence intervals (CI) for aggressive cancer were 1.0 (referent), 1.62 (0.97-2.68), 1.12 (0.66-1.90), and 1.14 (0.67-1.94), P(trend) = 0.87). Pristanic acid was strongly correlated with phytanic acid levels (r = 0.73, P < 0.0001), and was similarly unrelated to prostate cancer risk. Significant interactions between phytanic and pristanic acids and baseline circulating β-carotene concentrations were noted in relation to total and aggressive disease among participants who did not receive β-carotene supplements as part of the original ATBC intervention trial. In summary, we observed no overall association between serum phytanic and pristanic acid levels and prostate cancer risk. Findings indicating that the direction and magnitude of these associations depended upon serum levels of the antioxidant β-carotene among men not taking β-carotene supplements should be interpreted cautiously, as they are likely due to chance.
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Affiliation(s)
- Margaret E Wright
- Department of Pathology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois; American Academy of Pediatrics, Elk Grove Village, Illinois
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Stereoselective synthesis of perdeuterated phytanic acid, its phospholipid derivatives and their formation into lipid model membranes for neutron reflectivity studies. Chem Phys Lipids 2014; 183:22-33. [DOI: 10.1016/j.chemphyslip.2014.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 04/01/2014] [Accepted: 04/07/2014] [Indexed: 11/23/2022]
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12
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Key TJ. Nutrition, hormones and prostate cancer risk: results from the European prospective investigation into cancer and nutrition. Recent Results Cancer Res 2014; 202:39-46. [PMID: 24531775 DOI: 10.1007/978-3-642-45195-9_4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nutritional factors may influence the risk of developing prostate cancer, but understanding of this topic is poor. This chapter discusses research on this subject, mostly from the European Prospective Investigation into Cancer and Nutrition (EPIC), a cohort which includes 150,000 men recruited in the 1990s in eight European countries. So far the EPIC collaborators have published analyses of the relationship of prostate cancer risk with the intake of a range of foods and nutrients, and with blood-based markers of nutritional factors, on up to nearly 3,000 incident cases of prostate cancer. Most of the results of these analyses have been null, with no clear indication that the risk for prostate cancer is related to intakes of meat, fish, fruit, vegetables, fibre, fat or alcohol or with blood levels of fatty acids, carotenoids, tocopherols, B vitamins, vitamin D, or selenium. There is some evidence from EPIC that risk may be increased in men with a high intake of protein from dairy products, and analyses of hormone levels have shown that risk is higher in men with relatively high blood levels of insulin-like growth factor-I (IGF-I). More research is needed to better describe the relationships of prostate cancer risk with IGF-I and related hormones, and to better understand whether nutritional factors may influence risk through hormones or perhaps by other mechanisms.
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Affiliation(s)
- Timothy J Key
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Richard Doll Building, Roosevelt Drive, Oxford, OX3 7LF, United Kingdom,
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Renner L, Kersten S, Duevel A, Schuberth HJ, Dänicke S. Effects of cis-9,trans-11 and trans-10,cis-12 conjugated linoleic acid, linoleic acid, phytanic acid and the combination of various fatty acids on proliferation and cytokine expression of bovine peripheral blood mononuclear cells. Nutrients 2013; 5:2667-83. [PMID: 23857174 PMCID: PMC3738994 DOI: 10.3390/nu5072667] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 05/31/2013] [Accepted: 06/24/2013] [Indexed: 12/16/2022] Open
Abstract
Fatty acids may have an impact on immune functions, which is important in times of increased mobilization of body fat, e.g., around parturition. The aim of the present study was to investigate the effects of the CLA isomers cis-9,trans-11 and trans-10,cis-12, phytanic acid (PA), linoleic acid (LA) and a fatty acid (FA) mixture (containing 29.8% palmitic acid, 6.7% palmitoleic acid, 17.4% stearic acid and 46.1% oleic acid) on the proliferation of bovine blood mononuclear cells (PBMC) in vitro using alamar blue (AB) and 5-bromo-2′-deoxyuridine (BrdU) assay. Quantitative real time polymerase chain reaction analyses were performed to evaluate the expression of interleukin (IL)-4, IL-10, interferon (IFN)-γ, tumor necrosis factor (TNF)-α and peroxisome proliferator-activated receptor (PPAR)-γ in response to cis-9,trans-11 and LA. The IC50 values did not differ between the investigated FA, but there were differences within the proliferation in the response of these FA in a concentration range between 20 and 148 µM (e.g., increased proliferation after treatment with lower concentrations of LA). No differences occurred when different FA combinations were tested. ConA stimulation increased the expression of TNF-α and IFN-γ, whereas IL-10 decreased. In general, neither the baseline expression nor the ConA-stimulated mRNA expression of cytokines and PPAR-γ were affected by the FA. In conclusion, all FA inhibit the proliferation of PBMC dose dependently without significantly altering the induced cytokine spectrum of activated bovine PBMC.
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Affiliation(s)
- Lydia Renner
- Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Federal Research Institute for Animal Health, Bundesallee 50, 38116 Braunschweig, Germany; E-Mails: (L.R.); (S.D.)
| | - Susanne Kersten
- Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Federal Research Institute for Animal Health, Bundesallee 50, 38116 Braunschweig, Germany; E-Mails: (L.R.); (S.D.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +49-531-596-3152; Fax: +49-531-596-3199
| | - Anna Duevel
- Immunology Unit, University of Veterinary Medicine, Bischofsholer Damm 15, 30173 Hannover, Germany; E-Mails: (A.D.); (H.-J.S.)
| | - Hans-Joachim Schuberth
- Immunology Unit, University of Veterinary Medicine, Bischofsholer Damm 15, 30173 Hannover, Germany; E-Mails: (A.D.); (H.-J.S.)
| | - Sven Dänicke
- Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Federal Research Institute for Animal Health, Bundesallee 50, 38116 Braunschweig, Germany; E-Mails: (L.R.); (S.D.)
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14
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Lloyd MD, Yevglevskis M, Lee GL, Wood PJ, Threadgill MD, Woodman TJ. α-Methylacyl-CoA racemase (AMACR): Metabolic enzyme, drug metabolizer and cancer marker P504S. Prog Lipid Res 2013; 52:220-30. [DOI: 10.1016/j.plipres.2013.01.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 01/14/2013] [Accepted: 01/15/2013] [Indexed: 10/27/2022]
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15
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Song Y, Chavarro JE, Cao Y, Qiu W, Mucci L, Sesso HD, Stampfer MJ, Giovannucci E, Pollak M, Liu S, Ma J. Whole milk intake is associated with prostate cancer-specific mortality among U.S. male physicians. J Nutr 2013; 143:189-96. [PMID: 23256145 PMCID: PMC3542910 DOI: 10.3945/jn.112.168484] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Previous studies have associated higher milk intake with greater prostate cancer (PCa) incidence, but little data are available concerning milk types and the relation between milk intake and risk of fatal PCa. We investigated the association between intake of dairy products and the incidence and survival of PCa during a 28-y follow-up. We conducted a cohort study in the Physicians' Health Study (n = 21,660) and a survival analysis among the incident PCa cases (n = 2806). Information on dairy product consumption was collected at baseline. PCa cases and deaths (n = 305) were confirmed during follow-up. The intake of total dairy products was associated with increased PCa incidence [HR = 1.12 (95% CI: 0.93, 1.35); >2.5 servings/d vs. ≤0.5 servings/d]. Skim/low-fat milk intake was positively associated with risk of low-grade, early stage, and screen-detected cancers, whereas whole milk intake was associated only with fatal PCa [HR = 1.49 (95% CI: 0.97, 2.28); ≥237 mL/d (1 serving/d) vs. rarely consumed]. In the survival analysis, whole milk intake remained associated with risk of progression to fatal disease after diagnosis [HR = 2.17 (95% CI: 1.34, 3.51)]. In this prospective cohort, higher intake of skim/low-fat milk was associated with a greater risk of nonaggressive PCa. Most importantly, only whole milk was consistently associated with higher incidence of fatal PCa in the entire cohort and higher PCa-specific mortality among cases. These findings add further evidence to suggest the potential role of dairy products in the development and prognosis of PCa.
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Affiliation(s)
- Yan Song
- Department of Epidemiology and Program on Genomics and Nutrition, Fielding School of Public Health,Center for Metabolic Disease Prevention, and
| | - Jorge E. Chavarro
- Channing Division of Network Medicine, and,Department of Nutrition, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | - Yin Cao
- Channing Division of Network Medicine, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | | | - Lorelei Mucci
- Channing Division of Network Medicine, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | - Howard D. Sesso
- Divisions of Preventive Medicine and Aging, Brigham and Women's Hospital and Harvard Medical School; Boston, MA,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | - Meir J. Stampfer
- Channing Division of Network Medicine, and,Department of Nutrition, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | - Edward Giovannucci
- Channing Division of Network Medicine, and,Department of Nutrition, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and
| | - Michael Pollak
- Cancer Prevention Research Unit, Departments of Medicine and Oncology, Lady Davis Research Institute of the Jewish General Hospital and McGill University, Montreal, Quebec, Canada
| | - Simin Liu
- Department of Epidemiology and Program on Genomics and Nutrition, Fielding School of Public Health,Center for Metabolic Disease Prevention, and,Departments of Medicine and Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, CA
| | - Jing Ma
- Channing Division of Network Medicine, and,Department of Epidemiology, Harvard School of Public Health, Boston, MA; and,To whom correspondence should be addressed. E-mail:
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16
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Travis RC, Appleby PN, Siddiq A, Allen NE, Kaaks R, Canzian F, Feller S, Tjønneland A, Føns Johnsen N, Overvad K, Ramón Quirós J, González CA, Sánchez MJ, Larrañaga N, Chirlaque MD, Barricarte A, Khaw KT, Wareham N, Trichopoulou A, Valanou E, Oustoglou E, Palli D, Sieri S, Tumino R, Sacerdote C, Bueno-de-Mesquita HBA, Stattin P, Ferrari P, Johansson M, Norat T, Riboli E, Key TJ. Genetic variation in the lactase gene, dairy product intake and risk for prostate cancer in the European prospective investigation into cancer and nutrition. Int J Cancer 2012; 132:1901-10. [PMID: 22965418 PMCID: PMC3594976 DOI: 10.1002/ijc.27836] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 07/04/2012] [Indexed: 01/12/2023]
Abstract
High dairy protein intake has been found to be associated with increased prostate cancer risk in the European Prospective Investigation into Cancer and Nutrition (EPIC). To further examine this possible relationship, we investigated the hypothesis that a genetic polymorphism in the lactase (LCT) gene might be associated with elevated dairy product intake and increased prostate cancer risk in a case–control study nested in EPIC. The C/T-13910 lactase variant (rs4988235) was genotyped in 630 men with prostate cancer and 873 matched control participants. Dairy product consumption was assessed by diet questionnaire. Odds ratios (ORs) for prostate cancer in relation to lactase genotype were estimated by conditional logistic regression. Lactase genotype frequency varied significantly between countries, with frequencies of the T (lactase persistence) allele ranging from 7% in Greece to 79% in Denmark. Intake of milk and total dairy products varied significantly by lactase genotype after adjustment for recruitment center; adjusted mean intakes of milk were 44.4, 69.8 and 82.3 g/day among men with CC, CT and TT genotypes, respectively. The lactase variant was not significantly associated with prostate cancer risk, both in our data (adjusted OR for TT vs. CC homozygotes: 1.10, 95% CI: 0.76–1.59) and in a meta-analysis of all the published data (combined OR for T allele carriers vs. CC homozygotes: 1.12, 0.96–1.32). These findings show that while variation in the lactase gene is associated with milk intake in men, the lactase polymorphism does not have a large effect on prostate cancer risk. What's new? High dairy protein intake has previously been found to be associated with increased prostate cancer risk in the European Prospective Investigation into Cancer and Nutrition (EPIC). The current study was nested in EPIC, and results from this first Europe-wide study suggest that while the C/T13910 lactase polymorphism is associated with milk intake, the variant has no large effect on prostate cancer risk. The data illustrate the challenges of applying mendelian randomisation to explore the relationship between dairy product consumption and cancer risk. Very large studies with both genetic and dietary data are thus needed for investigations using genetic proxies of nutritional exposures.
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Affiliation(s)
- Ruth C Travis
- Cancer Epidemiology Unit, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom.
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17
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Ollberding NJ, Aschebrook-Kilfoy B, Caces DBD, Wright ME, Weisenburger DD, Smith SM, Chiu BCH. Phytanic acid and the risk of non-Hodgkin lymphoma. Carcinogenesis 2012; 34:170-5. [PMID: 23042099 DOI: 10.1093/carcin/bgs315] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Greater consumption of red meat, processed meat and dairy products has been associated with an increased risk of non-Hodgkin lymphoma (NHL) in several previous reports. Phytanic acid, a saturated fatty acid obtained primarily through the consumption of ruminant meat and dairy products, may offer a potential underlying mechanism for these associations. In a population-based case-control study of 336 cases and 460 controls conducted in Nebraska during 1999-2002, we examined whether phytanic acid-containing foods or total phytanic acid intake, estimated from a food frequency questionnaire and the published phytanic acid values of 151 food items, were associated with increased NHL risk. Unconditional logistic regression was used to calculate odds ratios (ORs) and 95% confidence intervals for overall NHL and the common NHL histologic subtypes. In multivariable models, higher intakes of density-adjusted beef [OR(T3 vs. T1) = 1.5 (1.1-2.2); P(trend) = 0.02], total dairy products [OR = 1.5 (1.1-2.2); P(trend) = 0.02) and milk [OR = 1.6 (1.1-2.3); P(trend) = 0.01] were associated with an increased risk of NHL. Intake of total phytanic acid was positively associated with NHL risk [OR = 1.5 (1.0-2.1); P(trend) = 0.04]. In analyses stratified by NHL subtype, greater consumption of beef was associated with an increased risk of diffuse large B-cell lymphoma, and greater consumption of milk was associated with an increased risk of follicular lymphoma (FL). Total phytanic acid intake was associated with an increased risk of FL and small lymphocytic lymphoma/chronic lymphocytic leukemia. Our results provide support that total phytanic acid and phytanic acid-containing foods may increase NHL risk.
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18
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Chagas CEA, Rogero MM, Martini LA. Evaluating the links between intake of milk/dairy products and cancer. Nutr Rev 2012; 70:294-300. [PMID: 22537215 DOI: 10.1111/j.1753-4887.2012.00464.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Milk and dairy products are widely recommended as part of a healthy diet. These products, however, can contain hormones such as insulin-like growth factor 1, and some studies have suggested that a high intake of milk and dairy products may increase the risk of cancer. This review examines recent studies on this topic, with the evidence suggesting that the recommended intake of milk and dairy products (3 servings/day) is safe and, importantly, does not seem to increase the risk of cancer. On the basis of the studies included in this review, cultured milk, yogurt, and low-fat dairy products should be preferred as the milk and dairy products of choice.
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Affiliation(s)
- Carlos E A Chagas
- Center for Nutrition Practice and Research, Department of Education, Institute of Biosciences, São Paulo State University, Botucau/Sp, Brazil
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19
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Wright ME, Bowen P, Virtamo J, Albanes D, Gann PH. Estimated phytanic acid intake and prostate cancer risk: a prospective cohort study. Int J Cancer 2012; 131:1396-406. [PMID: 22120496 DOI: 10.1002/ijc.27372] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 11/15/2011] [Indexed: 12/19/2022]
Abstract
Phytanic acid is a saturated fatty acid found predominantly in red meat and dairy products and may contribute to increases in prostate cancer risk that are observed with higher intakes of these foods. We constructed a novel summary measure of phytanic acid intake and prospectively examined its association with prostate cancer risk in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study--a cohort of Finnish male smokers aged 50-69 years. Diet was assessed at baseline in 27,111 participants using a validated 276-item dietary questionnaire. Since phytanic acid is not currently included in food composition tables, we used the published phytanic acid content of 151 major food items to estimate total daily intake. During up to 21 years of follow-up, a total of 1,929 incident prostate cancer cases (including 438 advanced cases) were identified. Higher phytanic acid intake, though unrelated to the risk of localized disease [relative risks (RR) and 95% confidence intervals (CI) for increasing quartiles of intake = 1.00 (ref), 0.83 (0.68-1.01), 0.76 (0.62-0.94) and 0.91 (0.74-1.13); p trend = 0.23], was associated with increased risks of advanced prostate cancer [RR and 95% CI = 1.00 (ref), 1.43 (1.09-1.89), 1.31 (0.99-1.75) and 1.38 (1.02-1.89); p trend = 0.06]. This association appeared to be driven predominantly by phytanic acid obtained from dairy products (particularly butter). Our study indicates that phytanic acid may contribute to previously observed associations between high-fat animal foods (particularly dairy products) and prostate cancer risk, although some caution is warranted as it may be acting as a surrogate marker of dairy fat.
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Affiliation(s)
- Margaret E Wright
- Department of Pathology, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612, USA.
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20
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Barlow JL, McKenzie ANJ. Nuocytes: expanding the innate cell repertoire in type-2 immunity. J Leukoc Biol 2011; 90:867-74. [PMID: 21712394 DOI: 10.1189/jlb.0311160] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Activation and differentiation of the Th1 cell population lead to their production of the classical type-1 cytokines IFN-γ, IL-2, and TNF-β, thus promoting type-1 immunity. This is thought to occur via the ligation of TLRs by bacterial and viral products, which in turn, drive production of the essential Th1 cell differentiation factor, IL-12, by dendritic cells (DCs). Concurrent studies have been able to identify the effector cytokines produced by Th2 cells (IL-4, IL-5, IL-9, and IL-13) as being essential for parasitic immunity and also as essential factors in allergic asthma. However, the factors that are critical for initiation of the type-2 response remained obscure. Recently however, two critical observations have led to a more detailed understanding of the innate type-2 response. First, two novel, type-2-inducing cytokines-IL-25 and IL-33-were identified as being necessary for the up-regulation of the type-2 effector cytokines, mirroring the role of IL-12 in the type-1 response. Second, studies focused on target cell populations of IL-25 and IL-33 have identified novel, innate cell populations, which potentially bridge the gap between presentation of the type-2-inducing cytokine and the later adaptive Th2 cell response. In this review, we will discuss these new type-2 innate cell populations, in particular, the recently discovered nuocyte population, which are required for type-2 responses against helminthic parasites.
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21
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Werner LB, Hellgren LI, Raff M, Jensen SK, Petersen RA, Drachmann T, Tholstrup T. Effect of dairy fat on plasma phytanic acid in healthy volunteers - a randomized controlled study. Lipids Health Dis 2011; 10:95. [PMID: 21663648 PMCID: PMC3127790 DOI: 10.1186/1476-511x-10-95] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 06/10/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Phytanic acid produced in ruminants from chlorophyll may have preventive effects on the metabolic syndrome, partly due to its reported RXR and PPAR- α agonist activity. Milk from cows fed increased levels of green plant material, contains increased phytanic acid concentrations, but it is unknown to what extent minor increases in phytanic acid content in dairy fat leads to higher circulating levels of phytanic acid in plasma of the consumers. OBJECTIVE To investigate if cow feeding regimes affects concentration of plasma phytanic acid and risk markers of the metabolic syndrome in human. DESIGN In a double-blind, randomized, 4 wk, parallel intervention study 14 healthy young subjects were given 45 g milk fat/d from test butter and cheese with 0.24 wt% phytanic acid or a control diet with 0.13 wt% phytanic acid. Difference in phytanic acid was obtained by feeding roughage with low or high content of chlorophyll. RESULTS There tended to be a difference in plasma phytanic acid (P = 0.0730) concentration after the dietary intervention. Plasma phytanic acid increased significantly within both groups with the highest increase in control group (24%) compared to phytanic acid group (15%). There were no significant effects of phytanic acid on risk markers for the metabolic syndrome. CONCLUSIONS The results indicate that increased intake of dairy fat modify the plasma phytanic acid concentration, regardless of cows feeding regime and the minor difference in dietary phytanic acid. Whether the phytanic acid has potential to affects the risk markers of the metabolic syndrome in human still remain to be elucidated.
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Affiliation(s)
- Louise B Werner
- Department of Human Nutrition, Faculty of Life, University of Copenhagen, Frederiksberg 1958, Denmark.
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Wright JL, Neuhouser ML, Lin DW, Kwon EM, Feng Z, Ostrander EA, Stanford JL. AMACR polymorphisms, dietary intake of red meat and dairy and prostate cancer risk. Prostate 2011; 71:498-506. [PMID: 20945498 PMCID: PMC3148811 DOI: 10.1002/pros.21267] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2010] [Accepted: 08/09/2010] [Indexed: 11/09/2022]
Abstract
BACKGROUND Alpha-methylacyl CoA racemase (AMACR) is an enzyme involved in fatty acids metabolism. One of AMACRs primary substrates, phytanic acid, is principally obtained from dietary red meat/dairy, which are associated with prostate cancer (PCa) risk. AMACR is also a tumor tissue biomarker over-expressed in PCa. In this study, we explored the potential relationship between AMACR polymorphisms, red meat/dairy intake, and PCa risk. METHODS Caucasian participants from two population-based PCa case-control studies were included. AMACR single nucleotide polymorphisms (SNPs) were selected to capture variation across the gene and regulatory regions. Red meat and dairy intake was determined from food frequency questionnaires. The odds ratio (OR) of PCa (overall and by disease aggressiveness) was estimated by logistic and polytomous regression. Potential interactions between genotypes and dietary exposures were evaluated. RESULTS Data from 1,309 cases and 1,267 controls were analyzed. Carriers of the variant T allele (rs2287939) had an OR of 0.81 (95% CI 0.68-0.97) for less aggressive PCa, but no alteration in risk for more aggressive PCa. Red meat consumption was positively associated with PCa risk, and the association was stronger for more aggressive disease (lowest vs. highest tertile OR=1.55, 95% CI 1.10-2.20). No effect modification of AMACR polymorphisms by either dietary red meat or dairy intake on PCa risk was observed. CONCLUSIONS PCa risk varied by level of red meat intake and by one AMACR SNP, but there was no evidence for gene-environment interaction. These findings suggest that the effects of AMACR polymorphisms and red meat and dairy on PCa risk are independent.
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Affiliation(s)
- Jonathan L Wright
- Department of Urology, University of Washington School of Medicine, Seattle, Washington 98195, USA.
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