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Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer

Tumorigenesis typically requires the accumulation of several driver gene mutations; therefore, there is a mutation threshold for the completion of the neoplastic process. Obesity increases the risk of cancer, and we have proposed that one mechanism whereby obesity raises the risk of microsatellite s...

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Autores principales: Lazarova, Darina, Bordonaro, Michael
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Ivyspring International Publisher 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414022/
https://www.ncbi.nlm.nih.gov/pubmed/36046651
http://dx.doi.org/10.7150/jca.76052
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author Lazarova, Darina
Bordonaro, Michael
author_facet Lazarova, Darina
Bordonaro, Michael
author_sort Lazarova, Darina
collection PubMed
description Tumorigenesis typically requires the accumulation of several driver gene mutations; therefore, there is a mutation threshold for the completion of the neoplastic process. Obesity increases the risk of cancer, and we have proposed that one mechanism whereby obesity raises the risk of microsatellite stable (MSS) colon cancer is by decreasing the mutation threshold. Therefore, obese MSS colon cancer patients should exhibit fewer driver gene mutations compared to normal body-mass index (BMI) patients. Our hypothesis is supported by results from analyses of The Cancer Genome Atlas (TCGA) data, which revealed that cancer genomes of obese MSS colon patients exhibit both fewer somatic mutations and fewer driver gene mutations. These findings could be explained by the high levels of obesity-associated cytokines and factors, the signaling pathways of which substitute for the additional driver gene mutations detected in normal-weight MSS colon cancer patients. Therefore, obesity-induced aberrant cell signaling might cooperate with initiating driver gene mutations to promote neoplastic development. Consistent with this possibility, we observed a lower number of KRAS mutations in high-BMI MSS colon cancer patients. This paper extends our hypothesis to address the interactions between obesity, immune surveillance in neoplastic development, and colorectal cancer (CRC) risk. A better understanding of these interactions will inform future preventive and therapeutic approaches against MSS CRC. We propose that the individual variations in the major histocompatibility class 1 (MHC-1) genotype interact with obesity to shape the tumor mutational landscape. Thus, the efficiency of the immune surveillance mechanisms to select against specific mutations may depend on both the MHC-1 genotype variant and the BMI of an individual. A high BMI is expected to reduce the number of driver gene mutations required to evade the MHC-1 surveillance mechanism and support an accelerated cancer progression.
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spelling pubmed-94140222022-08-30 Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer Lazarova, Darina Bordonaro, Michael J Cancer Hypothesis Tumorigenesis typically requires the accumulation of several driver gene mutations; therefore, there is a mutation threshold for the completion of the neoplastic process. Obesity increases the risk of cancer, and we have proposed that one mechanism whereby obesity raises the risk of microsatellite stable (MSS) colon cancer is by decreasing the mutation threshold. Therefore, obese MSS colon cancer patients should exhibit fewer driver gene mutations compared to normal body-mass index (BMI) patients. Our hypothesis is supported by results from analyses of The Cancer Genome Atlas (TCGA) data, which revealed that cancer genomes of obese MSS colon patients exhibit both fewer somatic mutations and fewer driver gene mutations. These findings could be explained by the high levels of obesity-associated cytokines and factors, the signaling pathways of which substitute for the additional driver gene mutations detected in normal-weight MSS colon cancer patients. Therefore, obesity-induced aberrant cell signaling might cooperate with initiating driver gene mutations to promote neoplastic development. Consistent with this possibility, we observed a lower number of KRAS mutations in high-BMI MSS colon cancer patients. This paper extends our hypothesis to address the interactions between obesity, immune surveillance in neoplastic development, and colorectal cancer (CRC) risk. A better understanding of these interactions will inform future preventive and therapeutic approaches against MSS CRC. We propose that the individual variations in the major histocompatibility class 1 (MHC-1) genotype interact with obesity to shape the tumor mutational landscape. Thus, the efficiency of the immune surveillance mechanisms to select against specific mutations may depend on both the MHC-1 genotype variant and the BMI of an individual. A high BMI is expected to reduce the number of driver gene mutations required to evade the MHC-1 surveillance mechanism and support an accelerated cancer progression. Ivyspring International Publisher 2022-08-08 /pmc/articles/PMC9414022/ /pubmed/36046651 http://dx.doi.org/10.7150/jca.76052 Text en © The author(s) https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/). See http://ivyspring.com/terms for full terms and conditions.
spellingShingle Hypothesis
Lazarova, Darina
Bordonaro, Michael
Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title_full Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title_fullStr Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title_full_unstemmed Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title_short Hypothesis: Mutations and Immunosurveillance in Obesity-Associated Colorectal Cancer
title_sort hypothesis: mutations and immunosurveillance in obesity-associated colorectal cancer
topic Hypothesis
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9414022/
https://www.ncbi.nlm.nih.gov/pubmed/36046651
http://dx.doi.org/10.7150/jca.76052
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