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Harris KL, Harris KJ, Banks LD, Adunyah SE, Ramesh A. Acceleration of benzo(a)pyrene-induced colon carcinogenesis by Western diet in a rat model of colon cancer. Curr Res Toxicol 2024; 6:100162. [PMID: 38496007 PMCID: PMC10943645 DOI: 10.1016/j.crtox.2024.100162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 03/02/2024] [Accepted: 03/06/2024] [Indexed: 03/19/2024] Open
Abstract
Colorectal cancer (CRC) is the third leading cause of cancer-related mortalities in the USA and around 52,550 people were expected to die from this disease by December 2023. The objective of this study was to investigate the effect of diet type on benzo(a)pyrene [B(a)P]-induced colon cancer in an adult male rat model, the Polyposis In the Rat Colon (PIRC) kindred type. Groups of PIRC rats (n = 10) were fed with AIN-76A regular diet (RD) or Western diet (WD) and received 25, 50 and 100 µg B(a)P/kg body wt. via oral gavage for 60 days. Rats fed diets alone, but no B(a)P, served as controls. After exposure, rats were euthanized; colon and liver samples were analyzed for activation of drug metabolizing enzymes (DMEs) CYP1A1, CYP1B1, SULT and GST. Plasma and tissue samples were analyzed by reverse phase-HPLC for B(a)P metabolites. In addition to these studies, DNA isolated from colon and liver tissues was analyzed for B(a)P-induced DNA adducts by the 32P-postlabeling method using a thin-layer chromatography system. Western diet consumption resulted in a marked increase in DME expression and B(a)P metabolite concentrations in rats that were administered 100 µg/kg B(a)P + WD (p < 0.05) compared to other treatment groups. Our findings demonstrate that WD accelerates the development of colon tumors induced by B(a)P through enhanced biotransformation, and the products of this process (metabolites) were found to bind with DNA and form B(a)P-DNA adducts, which may have given rise to colon polyps characterized by gain in tumor number, sizes, and dysplasia.
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Affiliation(s)
- Kelly L Harris
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 D.B. Todd Blvd., Nashville, TN 37208, United States
| | - Kenneth J Harris
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 D.B. Todd Blvd., Nashville, TN 37208, United States
| | - Leah D Banks
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 D.B. Todd Blvd., Nashville, TN 37208, United States
| | - Samuel E Adunyah
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 D.B. Todd Blvd., Nashville, TN 37208, United States
| | - Aramandla Ramesh
- Department of Biochemistry, Cancer Biology, Neuroscience & Pharmacology, Meharry Medical College, 1005 D.B. Todd Blvd., Nashville, TN 37208, United States
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Luu HN, Tran MT, Nguyen MVT, Tuong TTV, Tran QH, Le LC, Pham HTT, Ha HTT, Shrubsole MJ, Cai Q, Ye F, Boffetta P, Shu XO, Tran CTD. Association between body mass index and colorectal adenomas: Findings from a case-control study in Vietnam. Int J Cancer 2021; 149:1898-1909. [PMID: 34346504 DOI: 10.1002/ijc.33757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 07/26/2021] [Accepted: 07/28/2021] [Indexed: 01/22/2023]
Abstract
Colorectal cancer is a leading cancer worldwide and in Vietnam. Adenomas (adenomatous polyps) is an important precursor of colorectal cancer. There is currently no study to determine the modifiable risk factors for colorectal adenomas, including body mass index (BMI) in Vietnam. We conducted an individually matched case-control study of 1149 colorectal adenomas and 1145 controls in a large-scale colorectal screening program involving 103 542 individuals aged 40-75 years old in Hanoi, Vietnam. Conditional logistic regression was used to evaluate the association between BMI and colorectal adenomas prevalence, after controlling for potential confounders. Overall, comparing to normal weight (ie, 18.5-22.9 kg/m2 ), underweight (ie, BMI < 18.5) was associated with a non-statistically significant increased prevalence of colorectal adenomas (odd ratio [OR] = 1.29 and 95% confident interval [CI]: 0.88-1.87). This association became significant among male (OR = 1.98, 95% CI: 1.20-3.27), male who were ever smokers (OR = 2.59, 95% CI: 1.33-5.03), nonregular exercise (OR = 2.44, 95% CI: 1.26-4.73) and individuals with cardiometabolic disorders (OR = 3.46, 95% CI: 1.19-10.00). The association between underweight and colorectal adenomas did not vary by smoking status, drinking status, family history of cancer, adenomas types or cardiometabolic disorders. No association was observed among obese individuals (BMI ≥ 25). In the population with low prevalence of obesity, we found that the association between BMI and colorectal adenomas followed a reversed J-shape that underweight was associated with increased prevalence. Further studies are, therefore, warranted to replicate our results and to investigate the biologic mechanism the effect of underweight on colorectal adenomas prevalence.
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Affiliation(s)
- Hung N Luu
- UPMC Hillman Cancer Center, University of Pittsburgh Medical Center (UPMC), Pittsburgh, Pennsylvania, USA.,Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Mo Thi Tran
- Vietnam Colorectal Cancer and Polyps Research Program, Vinmec Healthcare System, Hanoi, Vietnam
| | - Mai Vu-Tuyet Nguyen
- Vietnam Colorectal Cancer and Polyps Research Program, Vinmec Healthcare System, Hanoi, Vietnam
| | - Thuy Thi-Van Tuong
- Vietnam Colorectal Cancer and Polyps Research Program, Vinmec Healthcare System, Hanoi, Vietnam
| | - Quang Hong Tran
- Vietnam Colorectal Cancer and Polyps Research Program, Vinmec Healthcare System, Hanoi, Vietnam
| | - Linh Cu Le
- College of Health Sciences, VinUniversity (VinUni), Hanoi, Vietnam
| | - Huong Thi-Thu Pham
- Department of Gastroenterology, Vinmec International Hospital at Times City, Vinmec Healthcare System, Hanoi, Vietnam
| | - Hien Thi-Thu Ha
- Department of Histopathology, Vinmec International Hospital at Times City, Vinmec Healthcare System, Hanoi, Vietnam
| | - Martha J Shrubsole
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Qiuyin Cai
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Fei Ye
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Paolo Boffetta
- Stony Brook Cancer Center, Stony Brooke University, Stony Brook, New York, USA.,Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Xiao-Ou Shu
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Chi Thi-Du Tran
- Vietnam Colorectal Cancer and Polyps Research Program, Vinmec Healthcare System, Hanoi, Vietnam.,College of Health Sciences, VinUniversity (VinUni), Hanoi, Vietnam
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3
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Lee K, Kim YH. Colorectal Polyp Prevalence According to Alcohol Consumption, Smoking and Obesity. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E2387. [PMID: 32244559 PMCID: PMC7177673 DOI: 10.3390/ijerph17072387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/25/2020] [Accepted: 03/27/2020] [Indexed: 12/12/2022]
Abstract
This study aimed to analyze colorectal polyp prevalence associated with health behavior. Data from 1180 Korean men (young adult (YA), aged 40-49; middle age (MA) aged 50-59; old aged (OA), aged 60-79 years) were collected. Health behavior included alcohol consumption, smoking status, and obesity. Obesity was determined using body mass index (BMI) and waist circumference (WC). Odds ratio (OR) was calculated by logistic regression. The prevalence of polyps increased for current smokers by 2.642 times in the YA group, 3.468 times in the MA group, and 3.104 times in the OA group compared to the never-smokers. The OR for WC increased in subjects with obesity by 1.514 in the MA and 1.451 in the OA group compared to normal. The prevalence of three or more polyps increased with WC obesity by 2.3 times in YA, 2.2 times in MA, and 1.9 times in OA compared to normal WC. Therefore, smoking cessation and obesity management may reduce the risk of colorectal polyps.
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Affiliation(s)
- Kyujin Lee
- Institute of Sports Science, Seoul National University, Seoul 08826, Korea;
| | - Yong Hwan Kim
- Department of Physical Education, Gangneung-Wonju National University, Gangneung-si 25457, Korea
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4
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Wong MCS, Huang J, Huang JLW, Pang TWY, Choi P, Wang J, Chiang JI, Jiang JY. Global Prevalence of Colorectal Neoplasia: A Systematic Review and Meta-Analysis. Clin Gastroenterol Hepatol 2020; 18:553-561.e10. [PMID: 31323383 DOI: 10.1016/j.cgh.2019.07.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 07/03/2019] [Accepted: 07/12/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Most colorectal cancers (CRC) arise from colorectal adenomas, yet there is not enough information on global prevalence to inform health care policy. We examined the prevalence of any type of adenomas, advanced adenomas (AADs), and CRC according to age, sex, ethnicity, geographic regions, and anatomic location (proximal vs distal). METHODS MEDLINE and Embase were searched from their inception through May 1, 2018, to identify population-based, observational studies that reported the prevalence of colorectal neoplasia. Studies on participants 15 years or older, with a sample size of 500 persons or more, were included. Metaprop (College Station, TX) was used to model within-study variability by binomial distribution and Freeman-Tukey Double Arcsine Transformation to stabilize the variances. The prevalence figures were presented by proportions and their 95% CIs using random-effects models. RESULTS Our meta-analysis included 70 studies involving 637,414 individuals. The overall prevalence rates of adenoma (23.9%; 95% CI, 22.2%-25.8%), AAD (4.6%; 95% CI, 3.8%-5.5%), and CRC (0.4%, 95% CI, 0.3%-0.5%) were calculated. Subgroup analysis indicated that prevalence values (adenomas, AADs, and CRCs) were higher among men (29.7%, 6.5%, and 0.8%, respectively) than women (19.3%, 3.8% and 0.4%, respectively), among older adults (25.9%, 5.2%, and 0.6%, respectively) than younger adults (14.6%, 1.6%, and 0.1%, respectively), among Caucasians (23.7%, 6.6%, and 0.5%, respectively) than other ethnicities, in European countries (25.9%, 8.4%, and 0.8%, respectively) than other countries, and among patients with proximal (25.9%, 5.3%, and 0.1%, respectively) vs distal neoplasia. CONCLUSIONS In a systematic review and meta-analysis, we found a high prevalence of colorectal neoplasia among some populations. This indicates a need to expand CRC screening programs for these groups. The pooled prevalence estimates can be used as quality indicators for established CRC screening programs.
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Affiliation(s)
- Martin C S Wong
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China; Institute of Digestive Disease, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China; State Key Laboratory of Digestive Disease, Chinese University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Junjie Huang
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Jason L W Huang
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Tiffany W Y Pang
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Peter Choi
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Jingxuan Wang
- Jockey Club School of Public Health and Primary Care, Chinese University University of Hong Kong, Hong Kong Special Administrative Region of the People's Republic of China
| | - Jason I Chiang
- Department of General Practice, University of Melbourne, Australia
| | - Johnny Yu Jiang
- School of Public Health, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China.
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5
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Spychalski P, Kobiela J, Wieszczy P, Kamiński MF, Reguła J. Clinical stages of colorectal cancer diagnosed in obese and overweight individuals in the Polish Colonoscopy Screening Program. United European Gastroenterol J 2019; 7:790-797. [PMID: 31316783 DOI: 10.1177/2050640619840451] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 03/07/2019] [Indexed: 12/14/2022] Open
Abstract
Background Obesity is a known risk factor of colorectal cancer (CRC). However, precise interconnections between excessive body fat and CRC are still vague. Therefore, the aim of this study was to assess whether stage of CRC detected in overweight and obese individuals differs from individuals with normal body mass index (BMI). A secondary aim of this study was to elucidate whether overweight and obesity influence the overall survival in CRC. Methods This study was a cross-sectional analysis of 163,129 individuals who underwent screening colonoscopy performed on data from a prospectively maintained database of the Polish Colonoscopy Screening Program. Results Overweight and obese individuals present with a less advanced CRC in screening setting (p = 0.014). This trend is the most pronounced in males (p = 0.001). Univariable and multivariable analyses revealed that obesity was a negative predictor of detection of advanced CRC with odds ratio 0.72 (95% confidence interval 0.52-1.00; p = 0.047). Furthermore, overweight and obesity were not statistically significant predictors of risk of death (p = 0.614 and p = 0.446, respectively). Conclusions Obese screenees present with a less advanced disease in comparison to non-obese. Moreover, survival stratified by clinical stage seems to not be influenced by BMI category. Therefore, a higher proportion of early diagnosed cancers can potentially create a survival benefit in this group.
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Affiliation(s)
- Piotr Spychalski
- Department of General, Endocrine and Transplant Surgery, Medical University of Gdansk, Gdansk, Poland
| | - Jarek Kobiela
- Department of General, Endocrine and Transplant Surgery, Medical University of Gdansk, Gdansk, Poland.,Department of Cancer Prevention, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
| | - Paulina Wieszczy
- Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland.,Department of Cancer Prevention, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
| | - Michał F Kamiński
- Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland.,Department of Oncological Gastroenterology, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.,Institute of Health and Society, University of Oslo, Oslo, Norway.,Department of Cancer Prevention, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
| | - Jarosław Reguła
- Department of Gastroenterology, Hepatology and Clinical Oncology, Centre of Postgraduate Medical Education, Warsaw, Poland.,Department of Cancer Prevention, the Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland
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6
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Harris KL, Pulliam SR, Okoro E, Guo Z, Washington MK, Adunyah SE, Amos-Landgraf JM, Ramesh A. Western diet enhances benzo(a)pyrene-induced colon tumorigenesis in a polyposis in rat coli (PIRC) rat model of colon cancer. Oncotarget 2018; 7:28947-60. [PMID: 26959117 PMCID: PMC5045369 DOI: 10.18632/oncotarget.7901] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 02/15/2016] [Indexed: 12/13/2022] Open
Abstract
Consumption of Western diet (WD), contaminated with environmental toxicants, has been implicated as one of the risk factors for sporadic colon cancer. Our earlier studies using a mouse model revealed that compared to unsaturated dietary fat, the saturated dietary fat exacerbated the development of colon tumors caused by B(a)P. The objective of this study was to study how WD potentiates B(a)P-induced colon carcinogenesis in the adult male rats that carry a mutation in the Apc locus - the polyposis in the rat colon (PIRC) rats. Groups of PIRC rats were fed with AIN-76A standard diet (RD) or Western diet (WD) and received 25, 50, or 100 μg B(a)P/kg body weight (wt) via oral gavage for 60 days. Subsequent to exposure, rats were euthanized; colons were retrieved and preserved in 10% formalin for counting the polyp numbers, measuring the polyp size, and histological analyses. Blood samples were collected and concentrations of cholesterol, triglycerides, glucose, insulin and leptin were measured. Rats that received WD + B(a)P showed increased levels of cholesterol, triglycerides, and leptin in comparison to RD + B(a)P groups or controls. The colon tumor numbers showed a B(a)P dose-response relationship. Adenomas with high grade dysplasia were prominent in B(a)P + WD rats compared to B(a)P + RD rats and controls (p < 0.05). The larger rat model system used in this study allows for studying more advanced tumor phenotypes over a longer duration and delineating the role of diet - toxicant interactions in sporadic colon tumor development.
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Affiliation(s)
- Kelly L Harris
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208, USA
| | - Stephanie R Pulliam
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208, USA
| | - Emmanuel Okoro
- Department of Physiology, Meharry Medical College, Nashville, TN 37208, USA
| | - Zhongmao Guo
- Department of Physiology, Meharry Medical College, Nashville, TN 37208, USA
| | - Mary K Washington
- Department of Pathology, Vanderbilt University, Nashville, TN 37232, USA
| | - Samuel E Adunyah
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208, USA
| | - James M Amos-Landgraf
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
| | - Aramandla Ramesh
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208, USA
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7
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Wong MCS, Chan CH, Cheung W, Fung DH, Liang M, Huang JLW, Wang YH, Jiang JY, Yu CP, Wang HH, Wu JCY, Chan FKL, Sung JJY. Association between investigator-measured body-mass index and colorectal adenoma: a systematic review and meta-analysis of 168,201 subjects. Eur J Epidemiol 2017; 33:15-26. [PMID: 29288474 PMCID: PMC5803281 DOI: 10.1007/s10654-017-0336-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 11/23/2017] [Indexed: 12/11/2022]
Abstract
The objective of this meta-analysis is to evaluate the odds of colorectal adenoma (CRA) in colorectal cancer screening participants with different body mass index (BMI) levels, and examine if this association was different according to gender and ethnicity. The EMBASE and MEDLINE were searched to enroll high quality observational studies that examined the association between investigator-measured BMI and colonoscopy-diagnosed CRA. Data were independently extracted by two reviewers. A random-effects meta-analysis was conducted to estimate the summary odds ratio (SOR) for the association between BMI and CRA. The Cochran’s Q statistic and I2 analyses were used to assess the heterogeneity. A total of 17 studies (168,201 subjects) were included. When compared with subjects having BMI < 25, individuals with BMI 25–30 had significantly higher risk of CRA (SOR 1.44, 95% CI 1.30–1.61; I2 = 43.0%). Subjects with BMI ≥ 30 had similarly higher risk of CRA (SOR 1.42, 95% CI 1.24–1.63; I2 = 18.5%). The heterogeneity was mild to moderate among studies. The associations were significantly higher than estimates by previous meta-analyses. There was no publication bias detected (Egger’s regression test, p = 0.584). Subgroup analysis showed that the magnitude of association was significantly higher in female than male subjects (SOR 1.43, 95% CI 1.30–1.58 vs. SOR 1.16, 95% CI 1.07–1.24; different among different ethnic groups (SOR 1.72, 1.44 and 0.88 in White, Asians and Africans, respectively) being insignificant in Africans; and no difference exists among different study designs. In summary, the risk conferred by BMI for CRA was significantly higher than that reported previously. These findings bear implications in CRA risk estimation.
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Affiliation(s)
- Martin Chi-Sang Wong
- Institute of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.,School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Chun-Hei Chan
- School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Wilson Cheung
- School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Din-Hei Fung
- School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Miaoyin Liang
- School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Jason Li-Wen Huang
- School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Yan-Hong Wang
- School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, 100050, China
| | - Johnny Yu Jiang
- Peking Union School of Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Chun-Pong Yu
- Li Ping Medical Library, Chinese University of Hong Kong, Shatin, HKSAR, China
| | - Harry Haoxiang Wang
- School of Public Health, Sun Yat-sen University, Guangzhou, 510080, Guangdong, China
| | - Justin Che-Yuen Wu
- Institute of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.,Department of Medicine and Therapeutics, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.,State Key Laboratory of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Francis Ka-Leung Chan
- Institute of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.,Department of Medicine and Therapeutics, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.,State Key Laboratory of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China
| | - Joseph Jao-Yiu Sung
- Institute of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China. .,Department of Medicine and Therapeutics, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China. .,State Key Laboratory of Digestive Disease, Faculty of Medicine, Chinese University of Hong Kong, Shatin, China.
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8
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Diggs DL, Myers JN, Banks LD, Niaz MS, Hood DB, Roberts LJ, Ramesh A. Influence of dietary fat type on benzo(a)pyrene [B(a)P] biotransformation in a B(a)P-induced mouse model of colon cancer. J Nutr Biochem 2013; 24:2051-63. [PMID: 24231098 PMCID: PMC3904801 DOI: 10.1016/j.jnutbio.2013.07.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 07/06/2013] [Accepted: 07/17/2013] [Indexed: 02/06/2023]
Abstract
In the US alone, around 60,000 lives/year are lost due to colon cancer. Diet and environment have been implicated in the development of sporadic colon tumors. The objective of this study was to determine how dietary fat potentiates the development of colon tumors through altered B(a)P biotransformation, using the Adenomatous polyposis coli with Multiple intestinal neoplasia mouse model. Benzo(a)pyrene was administered to mice through tricaprylin, and unsaturated (USF; peanut oil) and saturated (SF; coconut oil) fats at doses of 50 and 100 μg/kg via oral gavage over a 60-day period. Blood, colon, and liver were collected at the end of exposure period. The expression of B(a)P biotransformation enzymes [cytochrome P450 (CYP)1A1, CYP1B1 and glutathione-S-transferase] in liver and colon were assayed at the level of protein, mRNA and activities. Plasma and tissue samples were analyzed by reverse phase high-performance liquid chromatography for B(a)P metabolites. Additionally, DNA isolated from colon and liver tissues was analyzed for B(a)P-induced DNA adducts by the (32)P-postlabeling method using a thin-layer chromatography system. Benzo(a)pyrene exposure through dietary fat altered its metabolic fate in a dose-dependent manner, with 100 μg/kg dose group registering an elevated expression of B(a)P biotransformation enzymes, and greater concentration of B(a)P metabolites, compared to the 50 μg/kg dose group (P<.05). This effect was more pronounced for SF group compared to USF group (P<.05). These findings establish that SF causes sustained induction of B(a)P biotransformation enzymes and extensive metabolism of this toxicant. As a consequence, B(a)P metabolites were generated to a greater extent in colon and liver, whose concentrations also registered a dose-dependent increase. These metabolites were found to bind with DNA and form B(a)P-DNA adducts, which may have contributed to colon tumors in a subchronic exposure regimen.
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Affiliation(s)
- Deacqunita L. Diggs
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208
| | - Jeremy N. Myers
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208
| | - Leah D. Banks
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208
| | - Mohammad S. Niaz
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208
| | - Darryl B. Hood
- Department of Neuroscience and Pharmacology, Meharry Medical College,Nashville, TN 37208
| | - L. Jackson Roberts
- Departments of Pharmacology and Medicine, Pathology, Division of Clinical Pharmacology, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Aramandla Ramesh
- Department of Biochemistry and Cancer Biology, Meharry Medical College, Nashville, TN 37208
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