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Abstract
As an important nutrient in the human body, cholesterol can not only provide structural
components for the body's cells, but also can be transformed into a variety of active
substances to regulate cell signaling pathways. As an important cholesterol synthase,
DHCR24 participates in important regulatory processes in the body. The application
of DHCR24 in tumor clinical diagnosis and treatment also attracts much attention.
This article reviews the structure and regulatory characteristics of DHCR24, and the
research of DHCR24 on tumor progression. We summarize the possible mechanisms of DHCR24
promoting tumor progression through reactive oxygen species (ROS), p53, Ras and PI3K-AKT
pathways. Through our review, we hope to provide more research ideas and reference
value for the application of DHCR24 in tumor prevention and treatment.
This article provides an update on the global cancer burden using the GLOBOCAN 2020 estimates of cancer incidence and mortality produced by the International Agency for Research on Cancer. Worldwide, an estimated 19.3 million new cancer cases (18.1 million excluding nonmelanoma skin cancer) and almost 10.0 million cancer deaths (9.9 million excluding nonmelanoma skin cancer) occurred in 2020. Female breast cancer has surpassed lung cancer as the most commonly diagnosed cancer, with an estimated 2.3 million new cases (11.7%), followed by lung (11.4%), colorectal (10.0 %), prostate (7.3%), and stomach (5.6%) cancers. Lung cancer remained the leading cause of cancer death, with an estimated 1.8 million deaths (18%), followed by colorectal (9.4%), liver (8.3%), stomach (7.7%), and female breast (6.9%) cancers. Overall incidence was from 2-fold to 3-fold higher in transitioned versus transitioning countries for both sexes, whereas mortality varied <2-fold for men and little for women. Death rates for female breast and cervical cancers, however, were considerably higher in transitioning versus transitioned countries (15.0 vs 12.8 per 100,000 and 12.4 vs 5.2 per 100,000, respectively). The global cancer burden is expected to be 28.4 million cases in 2040, a 47% rise from 2020, with a larger increase in transitioning (64% to 95%) versus transitioned (32% to 56%) countries due to demographic changes, although this may be further exacerbated by increasing risk factors associated with globalization and a growing economy. Efforts to build a sustainable infrastructure for the dissemination of cancer prevention measures and provision of cancer care in transitioning countries is critical for global cancer control.
Cholesterol homeostasis is vital for proper cellular and systemic functions. Disturbed cholesterol balance underlies not only cardiovascular disease but also an increasing number of other diseases such as neurodegenerative diseases and cancers. The cellular cholesterol level reflects the dynamic balance between biosynthesis, uptake, export and esterification - a process in which cholesterol is converted to neutral cholesteryl esters either for storage in lipid droplets or for secretion as constituents of lipoproteins. In this Review, we discuss the latest advances regarding how each of the four parts of cholesterol metabolism is executed and regulated. The key factors governing these pathways and the major mechanisms by which they respond to varying sterol levels are described. Finally, we discuss how these pathways function in a concerted manner to maintain cholesterol homeostasis.
The synthesis of fatty acids and cholesterol, the building blocks of membranes, is regulated by three membrane-bound transcription factors: sterol regulatory element-binding proteins (SREBP)-1a, -1c, and -2. Their function in liver has been characterized in transgenic mice that overexpress each SREBP isoform and in mice that lack all three nuclear SREBPs as a result of gene knockout of SREBP cleavage-activating protein (SCAP), a protein required for nuclear localization of SREBPs. Here, we use oligonucleotide arrays hybridized with RNA from livers of three lines of mice (transgenic for SREBP-1a, transgenic for SREBP-2, and knockout for SCAP) to identify genes that are likely to be direct targets of SREBPs in liver. A total of 1,003 genes showed statistically significant increased expression in livers of transgenic SREBP-1a mice, 505 increased in livers of transgenic SREBP-2 mice, and 343 showed decreased expression in Scap-/- livers. A subset of 33 genes met the stringent combinatorial criteria of induction in both SREBP transgenics and decreased expression in SCAP-deficient mice. Of these 33 genes, 13 were previously identified as direct targets of SREBP action. Of the remaining 20 genes, 13 encode enzymes or carrier proteins involved in cholesterol metabolism, 3 participate in fatty acid metabolism, and 4 have no known connection to lipid metabolism. Through application of stringent combinatorial criteria, the transgenic/knockout approach allows identification of genes whose activities are likely to be controlled directly by one family of transcription factors, in this case the SREBPs.
Publisher:
SAGE Publications
(Sage CA: Los Angeles, CA
)
ISSN
(Print):
1533-0346
ISSN
(Electronic):
1533-0338
Publication date
(Electronic):
7
June
2024
Publication date Collection: 2024
Volume: 23
Electronic Location Identifier: 15330338241259780
Affiliations
[1
]Department of Gynecologic Oncology, Tianjin Medical University Cancer Institute and
Hospital, Tianjin, China
[2
]National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute
and Hospital, Tianjin, China
[3
]Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer
Institute and Hospital, Tianjin, China
[4
]Tianjin's Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute
and Hospital, Tianjin, China
[5
]Laboratory Animal Center, Tianjin Medical University Cancer Institute and Hospital,
Tianjin, China
Author notes
[*]Zhaosong Wang, Tianjin Medical University Cancer Institute and Hospital, He Xi District,
Tianjin, The People's Republic of China.
Email:
wangzhaosong@
123456tjmuch.com
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial
4.0 License (
https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without
further permission provided the original work is attributed as specified on the SAGE
and Open Access page (
https://us.sagepub.com/en-us/nam/open-access-at-sage).
History
Related
Funding
Funded by:
Seed Foundation of Tianjin Medical University Cancer Institute and Hospital;
Award ID: #1703
Categories
Subject:
New insight into targeting biomarkers of solid tumors: Therapy and Mechanism