TY - JOUR
T1 - Toll-like receptor 4 is a master regulator for colorectal cancer growth under high-fat diet by programming cancer metabolism
AU - Hu, Xianjing
AU - Fatima, Sarwat
AU - Chen, Minting
AU - Xu, Keyang
AU - Huang, Chunhua
AU - Gong, Rui Hong
AU - Su, Tao
AU - Wong, Hoi Leong Xavier
AU - Bian, Zhaoxiang
AU - Kwan, Hiu Yee
N1 - Funding Information:
This work was partially supported by Shenzhen Science and Technology Innovation Committee Grant #JCYJ20170413170320959, Key-Area Research and Development Program of Guangdong Province #2020B1111110003 to BZX; Research Grant Council of HKSAR HKBU-22103017-ECS, Innovation & Technology Commission #PRP/015/19FX, National Natural Science Foundation of China #SCM-2016-NSFC-003 and Natural Science Foundation of Guangdong Province #2018A0303130122, #2021A1515010655, and RC-FNRA-IG-20-21-SCM-01 to HYK; Hong Kong Scholar Program #XJ2015021, National Natural Science Foundation of China #81503303, and Natural Science Foundation of Guangdong Province #2015A030310226, #2016A030313825 to HXJ.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/8/12
Y1 - 2021/8/12
N2 - Although high-fat diet (HFD) has been implicated in the development of colorectal cancer (CRC), the critical signaling molecule that mediates the cancer growth is not well-defined. Identifying the master regulator that controls CRC growth under HFD can facilitate the development of effective therapeutics for the cancer treatment. In this study, the global lipidomics and RNA sequencing data show that, in the tumor tissues of CRC-bearing mouse models, HFD not only increases tumor weight, but also the palmitic acid level and TLR4 expression, which are reduced when HFD is replaced by control diet. These concomitant changes suggest the roles of palmitic acid and TLR4 in CRC growth. Subsequent studies show that palmitic acid regulates TLR4 expression in PU.1-dependent manner. Knockdown of PU.1 or mutations of PU.1-binding site on TLR4 promoter abolish the palmitic acid-increased TLR4 expression. The role of palmitic acid/PU.1/TLR4 axis in CRC growth is further examined in cell model and animal models that are fed either HFD or palmitic acid-rich diet. More importantly, iTRAQ proteomics data show that knockdown of TLR4 changes the metabolic enzyme profiles in the tumor tissues, which completely abolish the HFD-enhanced ATP production and cancer growth. Our data clearly demonstrate that TLR4 is a master regulator for CRC growth under HFD by programming cancer metabolism.
AB - Although high-fat diet (HFD) has been implicated in the development of colorectal cancer (CRC), the critical signaling molecule that mediates the cancer growth is not well-defined. Identifying the master regulator that controls CRC growth under HFD can facilitate the development of effective therapeutics for the cancer treatment. In this study, the global lipidomics and RNA sequencing data show that, in the tumor tissues of CRC-bearing mouse models, HFD not only increases tumor weight, but also the palmitic acid level and TLR4 expression, which are reduced when HFD is replaced by control diet. These concomitant changes suggest the roles of palmitic acid and TLR4 in CRC growth. Subsequent studies show that palmitic acid regulates TLR4 expression in PU.1-dependent manner. Knockdown of PU.1 or mutations of PU.1-binding site on TLR4 promoter abolish the palmitic acid-increased TLR4 expression. The role of palmitic acid/PU.1/TLR4 axis in CRC growth is further examined in cell model and animal models that are fed either HFD or palmitic acid-rich diet. More importantly, iTRAQ proteomics data show that knockdown of TLR4 changes the metabolic enzyme profiles in the tumor tissues, which completely abolish the HFD-enhanced ATP production and cancer growth. Our data clearly demonstrate that TLR4 is a master regulator for CRC growth under HFD by programming cancer metabolism.
KW - Animals
KW - Binding Sites
KW - Body Weight
KW - Cell Line, Tumor
KW - Cell Proliferation
KW - Colorectal Neoplasms/genetics
KW - Diet, High-Fat
KW - Disease Models, Animal
KW - Feeding Behavior
KW - Humans
KW - Lymphocytes, Tumor-Infiltrating
KW - Male
KW - Membrane Glycoproteins/metabolism
KW - Mice, Inbred BALB C
KW - Myeloid Differentiation Factor 88/metabolism
KW - Palmitic Acid/toxicity
KW - Principal Component Analysis
KW - Promoter Regions, Genetic/genetics
KW - Proto-Oncogene Proteins/metabolism
KW - Receptors, Interleukin-1/metabolism
KW - Toll-Like Receptor 4/genetics
KW - Trans-Activators/metabolism
UR - http://www.scopus.com/inward/record.url?scp=85112721865&partnerID=8YFLogxK
U2 - 10.1038/s41419-021-04076-x
DO - 10.1038/s41419-021-04076-x
M3 - Journal article
C2 - 34385421
AN - SCOPUS:85112721865
SN - 2041-4889
VL - 12
JO - Cell Death and Disease
JF - Cell Death and Disease
IS - 8
M1 - 791
ER -
