1
|
Perrar I, Buyken AE, Penczynski KJ, Remer T, Kuhnle GG, Herder C, Roden M, Della Corte K, Nöthlings U, Alexy U. Relevance of fructose intake in adolescence for fatty liver indices in young adulthood. Eur J Nutr 2021; 60:3029-3041. [PMID: 33464363 PMCID: PMC8354997 DOI: 10.1007/s00394-020-02463-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 12/11/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE To examine the association between fructose intake in adolescence and fatty liver indices (hepatic steatosis index (HSI), fatty liver index (FLI)) in young adulthood. METHODS Overall, 246 participants of the Dortmund Nutritional and Anthropometric Longitudinally Designed (DONALD) study who had a fasting blood sample in adulthood (18-36 years), at least two 3-day weighed dietary records for calculating fructose intakes and other fructose-containing sugars (total (TS), free (FS), added sugar (AS)) as well as two complete 24-h urine samples for calculating sugar excretion (fructose excretion (FE), fructose + sucrose excretion (FE + SE)) in adolescence (males: 9.5-16.5 years; females: 8.5-15.5 years) were analysed using multivariable linear regression analyses. RESULTS On the level of dietary intake, no prospective associations were observed between adolescent fructose intake and both adult fatty liver indices, whereas higher FS intakes were associated with lower levels of HSI (Ptrend = 0.02) and FLI (Ptrend = 0.03). On the urinary excretion level, however, a higher FE (Ptrend = 0.03) and FE + SE (Ptrend = 0.01) in adolescence were prospectively related to higher adult FLI values. No associations were observed between adolescent sugar excretion and adult HSI. CONCLUSION The present study does not provide unambiguous support for a detrimental impact of adolescent fructose intake on adult liver health. Nonetheless, further examinations estimating exposure by means of urinary excretion as well as dietary intake levels appear warranted.
Collapse
Affiliation(s)
- Ines Perrar
- Institute of Nutritional and Food Sciences , Nutritional Epidemiology, University of Bonn, DONALD Study, Heinstück 11, 44225 Dortmund, Germany
| | - Anette E. Buyken
- Institute of Nutrition, Consumption and Health, Faculty of Natural Sciences, University Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
| | - Katharina J. Penczynski
- Institute of Nutritional and Food Sciences , Nutritional Epidemiology, University of Bonn, DONALD Study, Heinstück 11, 44225 Dortmund, Germany
- Institute of Nutrition, Consumption and Health, Faculty of Natural Sciences, University Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
- Department Food Safety, German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Straße 8-10, 10589 Berlin, Germany
| | - Thomas Remer
- Institute of Nutritional and Food Sciences , Nutritional Epidemiology, University of Bonn, DONALD Study, Heinstück 11, 44225 Dortmund, Germany
| | - Gunter G. Kuhnle
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, RG6 6UR UK
| | - Christian Herder
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Düsseldorf, Auf’m Hennekamp 65, 40225 Düsseldorf, Germany
- German Center for Diabetes Research (DZD), Ingolstädter Landstr. 1, 85764 München-Neuherberg, Germany
- Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany
| | - Michael Roden
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University Düsseldorf, Auf’m Hennekamp 65, 40225 Düsseldorf, Germany
- German Center for Diabetes Research (DZD), Ingolstädter Landstr. 1, 85764 München-Neuherberg, Germany
- Division of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany
| | - Karen Della Corte
- Institute of Nutrition, Consumption and Health, Faculty of Natural Sciences, University Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
| | - Ute Nöthlings
- Institute of Nutritional and Food Sciences , Nutritional Epidemiology, University of Bonn, DONALD Study, Heinstück 11, 44225 Dortmund, Germany
- Institute of Nutritional and Food Sciences, Nutritional Epidemiology, University of Bonn, Endenicher Allee 19 B, 53115 Bonn, Germany
| | - Ute Alexy
- Institute of Nutritional and Food Sciences , Nutritional Epidemiology, University of Bonn, DONALD Study, Heinstück 11, 44225 Dortmund, Germany
| |
Collapse
|
2
|
van Breda SG, Mathijs K, Pieters HJ, Sági-Kiss V, Kuhnle GG, Georgiadis P, Saccani G, Parolari G, Virgili R, Sinha R, Hemke G, Hung Y, Verbeke W, Masclee AA, Vleugels-Simon CB, van Bodegraven AA, de Kok TM. Replacement of Nitrite in Meat Products by Natural Bioactive Compounds Results in Reduced Exposure to N-Nitroso Compounds: The PHYTOME Project. Mol Nutr Food Res 2021; 65:e2001214. [PMID: 34382747 PMCID: PMC8530897 DOI: 10.1002/mnfr.202001214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 07/16/2021] [Indexed: 11/07/2022]
Abstract
SCOPE It has been proposed that endogenously form N-nitroso compounds (NOCs) are partly responsible for the link between red meat consumption and colorectal cancer (CRC) risk. As nitrite has been indicated as critical factor in the formation of NOCs, the impact of replacing the additive sodium nitrite (E250) by botanical extracts in the PHYTOME project is evaluated. METHOD AND RESULTS A human dietary intervention study is conducted in which healthy subjects consume 300 g of meat for 2 weeks, in subsequent order: conventional processed red meat, white meat, and processed red meat with standard or reduced levels of nitrite and added phytochemicals. Consumption of red meat products enriched with phytochemicals leads to a significant reduction in the faecal excretion of NOCs, as compared to traditionally processed red meat products. Gene expression changes identify cell proliferation as main affects molecular mechanism. High nitrate levels in drinking water in combination with processed red meat intake further stimulates NOC formation, an effect that could be mitigated by replacement of E250 by natural plant extracts. CONCLUSION These findings suggest that addition of natural extracts to conventionally processed red meat products may help to reduce CRC risk, which is mechanistically support by gene expression analyses.
Collapse
Affiliation(s)
- Simone G van Breda
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, the Netherlands
| | - Karen Mathijs
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, the Netherlands
| | - Harm-Jan Pieters
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, the Netherlands
| | - Virág Sági-Kiss
- Department of Food & Nutritional Sciences, University of Reading, Reading, UK
| | - Gunter G Kuhnle
- Department of Food & Nutritional Sciences, University of Reading, Reading, UK
| | - Panagiotis Georgiadis
- National Hellenic Research Foundation, Institute of Biology, Medicinal Chemistry and Biotechnology, Athens, Greece
| | - Giovanna Saccani
- SSICA-Experimental Station for the Food Preserving Industry, Parma, Italy
| | - Giovanni Parolari
- SSICA-Experimental Station for the Food Preserving Industry, Parma, Italy
| | - Roberta Virgili
- SSICA-Experimental Station for the Food Preserving Industry, Parma, Italy
| | - Rashmi Sinha
- Division of Cancer Epidemiology & Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Gert Hemke
- Hemke Nutriconsult, Prins Clauslaan 70, 5684 GB Best, The Netherlands
| | - Yung Hung
- Department of Agricultural Economics, Ghent University, Coupure links 653, Gent, 9000, Belgium
| | - Wim Verbeke
- Department of Agricultural Economics, Ghent University, Coupure links 653, Gent, 9000, Belgium
| | - Ad A Masclee
- Division of Gastroenterology-Hepatology, Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands
| | | | | | - Theo M de Kok
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, the Netherlands
| | -
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 616, 6200 MD Maastricht, the Netherlands
| |
Collapse
|
3
|
van Breda SG, Mathijs K, Sági-Kiss V, Kuhnle GG, van der Veer B, Jones RR, Sinha R, Ward MH, de Kok TM. Impact of high drinking water nitrate levels on the endogenous formation of apparent N-nitroso compounds in combination with meat intake in healthy volunteers. Environ Health 2019; 18:87. [PMID: 31623611 PMCID: PMC6796425 DOI: 10.1186/s12940-019-0525-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 09/22/2019] [Indexed: 05/04/2023]
Abstract
BACKGROUND Nitrate is converted to nitrite in the human body and subsequently can react with amines and amides in the gastrointestinal tract to form N-nitroso compounds (NOCs), which are known to be carcinogenic in animals. Humans can be exposed to nitrate via consumption of drinking water and diet, especially green leafy vegetables and cured meat. The contribution of nitrate from drinking water in combination with meat intake has not been investigated thoroughly. Therefore, in the present pilot study, we examined the effect of nitrate from drinking water, and its interaction with the consumption of white and processed red meat, on the endogenous formation of NOCs, taking into account the intake of vitamin C, a nitrosation inhibitor. METHODS Twenty healthy subjects were randomly assigned to two groups consuming either 3.75 g/kg body weight (maximum 300 g per day) processed red meat or unprocessed white meat per day for two weeks. Drinking water nitrate levels were kept low during the first week (< 1.5 mg/L), whereas in week 2, nitrate levels in drinking water were adjusted to the acceptable daily intake level of 3.7 mg/kg bodyweight. At baseline, after 1 and 2 weeks, faeces and 24 h urine samples were collected for analyses of nitrate, apparent total N-nitroso compounds (ATNC), compliance markers, and genotoxic potential in human colonic Caco-2 cells. RESULTS Urinary nitrate excretion was significantly increased during the high drinking water nitrate period for both meat types. Furthermore, levels of compliance markers for meat intake were significantly increased in urine from subjects consuming processed red meat (i.e. 1-Methylhistidine levels), or unprocessed white meat (i.e. 3-Methylhistidine). ATNC levels significantly increased during the high drinking water nitrate period, which was more pronounced in the processed red meat group. Genotoxicity in Caco-2 cells exposed to faecal water resulted in increased genotoxicity after the interventions, but results were only significant in the low drinking water nitrate period in subjects consuming processed red meat. Furthermore, a positive correlation was found between the ratio of nitrate/vitamin C intake (including drinking water) and the level of ATNC in faecal water of subjects in the processed red meat group, but this was not statistically significant. CONCLUSIONS Drinking water nitrate significantly contributed to the endogenous formation of NOC, independent of the meat type consumed. This implies that drinking water nitrate levels should be taken into account when evaluating the effect of meat consumption on endogenous formation of NOC. TRIAL REGISTRATION Dutch Trialregister: 29707 . Registered 19th of October 2018. Retrospectively registered.
Collapse
Affiliation(s)
- Simone G van Breda
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O Box 616, 6200, MD, Maastricht, the Netherlands.
| | - Karen Mathijs
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O Box 616, 6200, MD, Maastricht, the Netherlands
| | - Virág Sági-Kiss
- Department of Food & Nutritional Sciences, University of Reading, Reading, UK
| | - Gunter G Kuhnle
- Department of Food & Nutritional Sciences, University of Reading, Reading, UK
| | - Ben van der Veer
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O Box 616, 6200, MD, Maastricht, the Netherlands
| | - Rena R Jones
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rashmi Sinha
- Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Mary H Ward
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Theo M de Kok
- Department of Toxicogenomics, GROW-school for Oncology and Developmental Biology, Maastricht University Medical Center, P.O Box 616, 6200, MD, Maastricht, the Netherlands
| |
Collapse
|
4
|
Bastide NM, Naud N, Nassy G, Vendeuvre JL, Taché S, Guéraud F, Hobbs DA, Kuhnle GG, Corpet DE, Pierre FHF. Red Wine and Pomegranate Extracts Suppress Cured Meat Promotion of Colonic Mucin-Depleted Foci in Carcinogen-Induced Rats. Nutr Cancer 2017; 69:289-298. [PMID: 28094544 DOI: 10.1080/01635581.2017.1263745] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Processed meat intake is carcinogenic to humans. We have shown that intake of a workshop-made cured meat with erythorbate promotes colon carcinogenesis in rats. We speculated that polyphenols could inhibit this effect by limitation of endogenous lipid peroxidation and nitrosation. Polyphenol-rich plant extracts were added to the workshop-made cured meat and given for 14 days to rats and 100 days to azoxymethane-induced rats to evaluate the inhibition of preneoplastic lesions. Colons of 100-d study were scored for precancerous lesions (mucin-depleted foci, MDF), and biochemical end points of peroxidation and nitrosation were measured in urinary and fecal samples. In comparison with cured meat-fed rats, dried red wine, pomegranate extract, α-tocopherol added at one dose to cured meat and withdrawal of erythorbate significantly decreased the number of MDF per colon (but white grape and rosemary extracts did not). This protection was associated with the full suppression of fecal excretion of nitrosyl iron, suggesting that this nitroso compound might be a promoter of carcinogenesis. At optimized concentrations, the incorporation of these plant extracts in cured meat might reduce the risk of colorectal cancer associated with processed meat consumption.
Collapse
Affiliation(s)
- Nadia M Bastide
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| | - Nathalie Naud
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| | | | | | - Sylviane Taché
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| | - Françoise Guéraud
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| | - Ditte A Hobbs
- c Department of Food and Nutritional Sciences , University of Reading , Whiteknights , UK
| | - Gunter G Kuhnle
- c Department of Food and Nutritional Sciences , University of Reading , Whiteknights , UK
| | - Denis E Corpet
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| | - Fabrice H F Pierre
- a INRA UMR1331, TOXALIM (Research Center in Food Toxicology), Université de Toulouse, ENVT, INP , Toulouse , France
| |
Collapse
|
5
|
Bastide NM, Chenni F, Audebert M, Santarelli RL, Taché S, Naud N, Baradat M, Jouanin I, Surya R, Hobbs DA, Kuhnle GG, Raymond-Letron I, Gueraud F, Corpet DE, Pierre FHF. A central role for heme iron in colon carcinogenesis associated with red meat intake. Cancer Res 2015; 75:870-9. [PMID: 25592152 DOI: 10.1158/0008-5472.can-14-2554] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Epidemiology shows that red and processed meat intake is associated with an increased risk of colorectal cancer. Heme iron, heterocyclic amines, and endogenous N-nitroso compounds (NOC) are proposed to explain this effect, but their relative contribution is unknown. Our study aimed at determining, at nutritional doses, which is the main factor involved and proposing a mechanism of cancer promotion by red meat. The relative part of heme iron (1% in diet), heterocyclic amines (PhIP + MeIQx, 50 + 25 μg/kg in diet), and NOC (induced by NaNO₂+ NaNO₂; 0.17 + 0.23 g/L of drinking water) was determined by a factorial design and preneoplastic endpoints in chemically induced rats and validated on tumors in Min mice. The molecular mechanisms (genotoxicity, cytotoxicity) were analyzed in vitro in normal and Apc-deficient cell lines and confirmed on colon mucosa. Heme iron increased the number of preneoplastic lesions, but dietary heterocyclic amines and NOC had no effect on carcinogenesis in rats. Dietary hemoglobin increased tumor load in Min mice (control diet: 67 ± 39 mm²; 2.5% hemoglobin diet: 114 ± 47 mm², P = 0.004). In vitro, fecal water from rats given hemoglobin was rich in aldehydes and was cytotoxic to normal cells, but not to premalignant cells. The aldehydes 4-hydroxynonenal and 4-hydroxyhexenal were more toxic to normal versus mutated cells and were only genotoxic to normal cells. Genotoxicity was also observed in colon mucosa of mice given hemoglobin. These results highlight the role of heme iron in the promotion of colon cancer by red meat and suggest that heme iron could initiate carcinogenesis through lipid peroxidation. .
Collapse
Affiliation(s)
- Nadia M Bastide
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France. INSERM UMR-S1018; Gustave Roussy; Université Paris-Sud, Villejuif, France
| | - Fatima Chenni
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France. Faculty of Sciences, Department of Biology, University of Djilali Liabes, Sidi Bel Abbes, Algeria
| | - Marc Audebert
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Raphaelle L Santarelli
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Sylviane Taché
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Nathalie Naud
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Maryse Baradat
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Isabelle Jouanin
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Reggie Surya
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Ditte A Hobbs
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading, United Kingdom
| | - Gunter G Kuhnle
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, Reading, United Kingdom
| | | | - Françoise Gueraud
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Denis E Corpet
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France
| | - Fabrice H F Pierre
- INRA UMR1331; TOXALIM (Research Center in Food Toxicology); Université de Toulouse; ENVT; INP; UPS; TOXALIM; Toulouse, France.
| |
Collapse
|
6
|
Gay LJ, Mitrou PN, Keen J, Bowman R, Naguib A, Cooke J, Kuhnle GG, Burns PA, Luben R, Lentjes M, Khaw KT, Ball RY, Ibrahim AE, Arends MJ. Dietary, lifestyle and clinicopathological factors associated with APC mutations and promoter methylation in colorectal cancers from the EPIC-Norfolk study. J Pathol 2012; 228:405-15. [PMID: 22864938 DOI: 10.1002/path.4085] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 07/27/2012] [Accepted: 07/29/2012] [Indexed: 12/21/2022]
Abstract
The tumour suppressor APC is the most commonly altered gene in colorectal cancer (CRC). Genetic and epigenetic alterations of APC may therefore be associated with dietary and lifestyle risk factors for CRC. Analysis of APC mutations in the extended mutation cluster region (codons 1276-1556) and APC promoter 1A methylation was performed on 185 archival CRC samples collected from participants of the European Prospective Investigation into Cancer (EPIC)-Norfolk study, with the aim of relating these to high-quality seven-day dietary and lifestyle data collected prospectively. Truncating APC mutations (APC(+) ) and promoter 1A methylation (PM(+) ) were identified in 43% and 23% of CRCs analysed, respectively. Distal CRCs were more likely than proximal CRCs to be APC(+) or PM(+) (p = 0.04). APC(+) CRCs were more likely to be moderately/well differentiated and microsatellite stable than APC(-) CRCs (p = 0.05 and 0.03). APC(+) CRC cases consumed more alcohol than their counterparts (p = 0.01) and PM(+) CRC cases consumed lower levels of folate and fibre (p = 0.01 and 0.004). APC(+) or PM(+) CRC cases consumed higher levels of processed meat and iron from red meat and red meat products (p = 0.007 and 0.006). Specifically, CRC cases harbouring GC-to-AT transition mutations consumed higher levels of processed meat (35 versus 24 g/day, p = 0.04) and iron from red meat and red meat products (0.8 versus 0.6 mg/day, p = 0.05). In a logistic regression model adjusted for age, sex and cigarette-smoking status, each 19 g/day (1SD) increment increase in processed meat consumption was associated with cases with GC-to-AT mutations (OR 1.68, 95% CI 1.03-2.75). In conclusion, APC(+) and PM(+) CRCs may be influenced by diet and GC-to-AT mutations in APC are associated with processed meat consumption, suggesting a mechanistic link with dietary alkylating agents, such as N-nitroso compounds.
Collapse
Affiliation(s)
- Laura J Gay
- Medical Research Council Dunn Human Nutrition Unit, Cambridge, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Kuhnle GG, Haferburg D, Grunow M, Hirsch D, Hahn U. Nano-electrospray mass spectrometry with a modified commercial IonSpray source. Rapid Commun Mass Spectrom 2000; 14:1307-1308. [PMID: 10918385 DOI: 10.1002/1097-0231(20000730)14:14<1307::aid-rcm33>3.0.co;2-#] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Electrospray mass spectrometry is a standard tool for the investigation of biological samples. Due to the high flowrates of the standard sources, large sample amounts are required and it is almost impossible to spray physiological solutions due to their aqueous medium. The introduction of microelectrospray sources has made it possible to decrease the sample amounts needed and enabled the use of buffered solutions. In this work, a nanoES-like source based on a modification of an existing IonSpray source is introduced. In contrast to other nanoES sources available, the modification presented allows a fast change between the nanoES and the normal IonSpray modes. Copyright 2000 John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- GG Kuhnle
- Institut fur Biochemie, Fakultat fur Biowissenschaften, Pharmazie und Psychologie, Universitat Leipzig, Talstrasse 33, 04103 Leipzig, Germany
| | | | | | | | | |
Collapse
|