Cited by 567Cancer, Lipids, and MetabolismCaveolin-1 and cellular processesLipid Membrane Structure and Behavior

Cholesterol targeting alters lipid raft composition and cell survival in prostate cancer cells and xenografts

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Zhuang, Liyan, Kim, Jayoung, Adam, Rosalyn M., Solomon, Keith R., Freeman, Michael R.·2005·Journal of Clinical Investigation

Abstract

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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Crossref · 10.1172/jci200519935

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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)
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
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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