Cholesterol targeting alters lipid raft composition and cell survival in prostate cancer cells and xenografts
Open accessAbstract
Lipid rafts are cholesterol-and sphingolipid-enriched microdomains in cell membranes that regulate phosphorylation cascades originating from membrane-bound proteins.In this study, we tested whether alteration of the cholesterol content of lipid rafts in prostate cancer (PCa) cell membranes affects cell survival mechanisms in vitro and in vivo.Simvastatin, a cholesterol synthesis inhibitor, lowered raft cholesterol content, inhibited Akt1 serine-threonine kinase (protein kinase Bα)/protein kinase B (Akt/PKB) pathway signaling, and induced apoptosis in caveolin-and PTEN-negative LNCaP PCa cells.Replenishing cell membranes with cholesterol reversed these inhibitory and apoptotic effects.Cholesterol also potentiated Akt activation in normal prostate epithelial cells, which were resistant to the apoptotic effects of simvastatin.Elevation of circulating cholesterol in SCID mice increased the cholesterol content and the extent of protein tyrosine phosphorylation in lipid rafts isolated from LNCaP/sHB xenograft tumors.Cholesterol elevation also promoted tumor growth, increased phosphorylation of Akt, and reduced apoptosis in the xenografts.Our results implicate membrane cholesterol in Akt signaling in both normal and malignant cells and provide evidence that PCa cells can become dependent on a cholesterol-regulated Akt pathway for cell survival.
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Cholesterol deprivation can inhibit tumor growth, decrease phosphorylation of AKT, promote apoptosis, decrease Bcl-xl, downregulate caspase 3 activation, or hinder entry of cells into S phase.
“cholesterol deprivation can inhibit tumor growth, decrease the phosphorylation of AKT, promote apoptosis62, decrease Bcl-xl, downregulate caspase 3 activation63, or hinder entry of cells into the S phase64.”
From RETRACTED ARTICLE: Fasting inhibits aerobic glycolysis and proliferation in colorectal cancer via the Fdft1-mediated AKT/mTOR/HIF1α pathway suppression (2020) · cites this paper as [62]
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- Authors
- Zhuang, L., Kim, J., Adam, R. M., Solomon, K. R., & Freeman, M. R.
- Affiliations
- Boston Children's Hospital (US)
- Corresponding author
- Freeman, Michael R.
- Venue
- Journal of Clinical Investigation
- Published
- 2005-03-17
- Volume
- 115
- Issue
- 4
- Pages
- 959-968
- ISSN
- 0021-9738 (ISSN-L)
- PMC
- PMC1064980
- OpenAlex
- W4233116228
- Cited by
- 567
- References
- 55
- Citations by year
- 2026: 5 · 2025: 20 · 2024: 19 · 2023: 29 · 2022: 17 · 2021: 37 · 2020: 23 · 2019: 41 · 2018: 27 · 2017: 27 · 2016: 24 · 2015: 23 · 2014: 30 · 2013: 28 · 2012: 34
- FWCI
- 9.65
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Clinical Investigation (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Department of Defense
- National Institutes of Health
- National Cancer Institute (R01CA101046)
- National Institute of Diabetes and Digestive and Kidney Diseases (R37 DK47556, P50DK65298, R37DK047556, P50DK065298)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Caveolin-1 and cellular processes
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
- Keywords
- cholesterol, lipid rafts, prostate cancer, simvastatin, Akt signaling, apoptosis, cell survival, LNCaP cells, tumor xenografts, tyrosine phosphorylation, tumor growth, circulating cholesterol
- MeSH terms
- Animals, Anticholesteremic Agents, Cell Survival, Cholesterol, Enzyme Activation, Humans, Male, Phosphorylation, Prostatic Neoplasms, Proto-Oncogene Proteins, Transplantation, Heterologous, Signal Transduction, Mice, SCID, Apoptosis, Protein Serine-Threonine Kinases, Simvastatin, Membrane Microdomains, Cell Line, Tumor, Proto-Oncogene Proteins c-akt, Mice
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