TY - JOUR
T1 - High-fat diet feeding and palmitic acid increase CRC growth in β2AR-dependent manner
AU - Fatima, Sarwat
AU - Hu, Xianjing
AU - Huang, Chunhua
AU - Zhang, Weixiong
AU - Cai, Jing
AU - Huang, Min
AU - Gong, Rui Hong
AU - Chen, Minting
AU - Ho, Alan H. M.
AU - Su, Tao
AU - Wong, Hoi Leong Xavier
AU - Bian, Zhaoxiang
AU - Kwan, Hiu Yee
N1 - Funding Information:
This work was partially supported by the Research Grant Council of HKSAR HKBU-22103017-ECS, Natural Science Foundation of Guangdong Province #2018A0303130122 and the Hong Kong Baptist University grant FRG2/17-18/002. We specially thank for Dr. Martha Dahlen for editing the paper.
Publisher copyright:
© The Author(s) 2019
PY - 2019/10
Y1 - 2019/10
N2 - Epidemiology studies indicate that consumption of high-fat diet (HFD) is directly associated with the development of colorectal cancer (CRC). However, the exact component in HFD and the mechanism underlying its effect on CRC growth remained unclear. Our study shows that HFD feeding increases β2AR expression in the xenograft tissues of CRC-bearing mouse model; the elevated β2AR expression is reduced when HFD is replaced by control diet, which strongly suggests an association between HFD feeding and β2AR expression in CRC. HFD feeding increases palmitic acid and stearic acid levels in CRC; however, only palmitic acid increases β2AR expression, which is dependent upon Sp1. β2AR plays the dominant role in promoting CRC cell proliferation among all the β-AR subtypes. More importantly, knockout of β2AR or knockdown of Sp1 abolishes the palmitic acid increased CRC cell proliferation, suggesting palmitic acid increases CRC cell proliferation in β2AR-dependent manner. HFD or palmitic acid-rich diet (PAD) also fails to increase the tumor growth in xenograft mouse models bearing β2AR-knockout CRC cells. β2AR promotes CRC growth by increasing the phosphorylation of HSL at the residue S552. The phosphorylated and activated HSL (S552) changes the metabolic phenotype of CRC and increases energy production, which promotes CRC growth. Our study has revealed the unique tumorigenic properties of palmitic acid in promoting CRC growth, and have delineated the underlying mechanism of action. We are also the first to report the linkage between HFD feeding and β-adrenergic signaling pathway in relation to CRC growth.
AB - Epidemiology studies indicate that consumption of high-fat diet (HFD) is directly associated with the development of colorectal cancer (CRC). However, the exact component in HFD and the mechanism underlying its effect on CRC growth remained unclear. Our study shows that HFD feeding increases β2AR expression in the xenograft tissues of CRC-bearing mouse model; the elevated β2AR expression is reduced when HFD is replaced by control diet, which strongly suggests an association between HFD feeding and β2AR expression in CRC. HFD feeding increases palmitic acid and stearic acid levels in CRC; however, only palmitic acid increases β2AR expression, which is dependent upon Sp1. β2AR plays the dominant role in promoting CRC cell proliferation among all the β-AR subtypes. More importantly, knockout of β2AR or knockdown of Sp1 abolishes the palmitic acid increased CRC cell proliferation, suggesting palmitic acid increases CRC cell proliferation in β2AR-dependent manner. HFD or palmitic acid-rich diet (PAD) also fails to increase the tumor growth in xenograft mouse models bearing β2AR-knockout CRC cells. β2AR promotes CRC growth by increasing the phosphorylation of HSL at the residue S552. The phosphorylated and activated HSL (S552) changes the metabolic phenotype of CRC and increases energy production, which promotes CRC growth. Our study has revealed the unique tumorigenic properties of palmitic acid in promoting CRC growth, and have delineated the underlying mechanism of action. We are also the first to report the linkage between HFD feeding and β-adrenergic signaling pathway in relation to CRC growth.
UR - http://www.scopus.com/inward/record.url?scp=85072713899&partnerID=8YFLogxK
U2 - 10.1038/s41419-019-1958-6
DO - 10.1038/s41419-019-1958-6
M3 - Article
C2 - 31558710
AN - SCOPUS:85072713899
SN - 2041-4889
VL - 10
JO - Cell Death and Disease
JF - Cell Death and Disease
M1 - 711
ER -
