Cited by 17Cholesterol and Lipid MetabolismCellular transport and secretionCancer, Lipids, and Metabolism

Modulation of PICALM Levels Perturbs Cellular Cholesterol Homeostasis

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Mercer, Jacob L., Argus, Joseph P., Crabtree, Donna M., Keenan, Melissa M., Wilks, Moses Q., Chi, Jen-Tsan Ashley, Bensinger, Steven J., Lavau, Catherine P. +1 more·2015·PLOS ONE

Abstract

PICALM (Phosphatidyl Inositol Clathrin Assembly Lymphoid Myeloid protein) is a ubiquitously expressed protein that plays a role in clathrin-mediated endocytosis. PICALM also affects the internalization and trafficking of SNAREs and modulates macroautophagy. Chromosomal translocations that result in the fusion of PICALM to heterologous proteins cause leukemias, and genome-wide association studies have linked PICALM Single Nucleotide Polymorphisms (SNPs) to Alzheimer's disease. To obtain insight into the biological role of PICALM, we performed gene expression studies of PICALM-deficient and PICALM-expressing cells. Pathway analysis demonstrated that PICALM expression influences the expression of genes that encode proteins involved in cholesterol biosynthesis and lipoprotein uptake. Gas Chromatography-Mass Spectrometry (GC-MS) studies indicated that loss of PICALM increases cellular cholesterol pool size. Isotopic labeling studies revealed that loss of PICALM alters increased net scavenging of cholesterol. Flow cytometry analyses confirmed that internalization of the LDL receptor is enhanced in PICALM-deficient cells as a result of higher levels of LDLR expression. These findings suggest that PICALM is required for cellular cholesterol homeostasis and point to a novel mechanism by which PICALM alterations may contribute to disease.

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Authors
Mercer, J. L., Argus, J. P., Crabtree, D. M., Keenan, M. M., Wilks, M. Q., Chi, J.-T. A., Bensinger, S. J., Lavau, C. P., & Wechsler, D. S.
Affiliations
  • Duke University (US)
  • University of California, Los Angeles (US)
  • Massachusetts General Hospital (US)
Corresponding author
Wechsler, Daniel S.
Venue
PLOS ONE
Published
2015-06-15
Volume
10
Issue
6
Pages
e0129776
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1548216896
Cited by
17
References
83
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 3 · 2021: 1 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 2
FWCI
1.34
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • Figshare (submittedVersion, cc-by)
Funders
  • Sontag Foundation
  • National Institutes of Health
  • University of California, Los Angeles
  • National Institute of General Medical Sciences (T32GM007184, T32-GM008469, T32GM007754)
  • National Institute of Allergy and Infectious Diseases (AI093768, R01AI093768)
  • Hyundai Hope On Wheels
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
Keywords
PICALM, clathrin-mediated endocytosis, cholesterol biosynthesis, lipoprotein uptake, macroautophagy, Alzheimer's disease
MeSH terms
Animals, Cell Line, Cholesterol, Homeostasis, Humans, Organ Specificity, Receptors, LDL, Gene Expression, Protein Transport, Monomeric Clathrin Assembly Proteins, RNA Interference, RNA, Small Interfering, Mice, Biosynthetic Pathways, Gene Knockout Techniques

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