Cholesterol accumulation in NPC1-deficient neurons is ganglioside dependent

Marjorie C. Gondré-Lewis, Robert McGlynn, Steven U. Walkley

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Niemann-Pick type C (NPC) disease is a lysosomal disorder commonly caused by a recessive mutation in NPC1, which encodes an integral membrane protein with regions of homology to the morphogen receptor, Patched, and to 3-hydroxy-3-methylglutaryl coenzyme A reductase [1, 2]. Neurons in NPC disease exhibit extensive storage of free cholesterol and glycosphingolipids (GSLs), including GM2 and GM3 gangliosides [3, 4, 5]. Most studies have viewed cholesterol storage as primary, with NPC1 functioning as a retroendocytic transporter for regulation of cholesterol homeostasis [3, 6, 7, 8]. Here, we analyze the effects of genetically depriving NPC neurons of complex gangliosides by creating mice doubly deficient in both NPC1 and the GSL synthetic enzyme, GM2/GD2 synthase (GalNAcT). Ganglioside and cholesterol expression in neurons of NPC1-/-/GalNAcT+/+, NPC1-/-/GalNAcT-/-, NPC1+/+/GalNAcT-/-, and WT mice was examined in situ by immunocytochemical and histochemical methods. Neurons in double-deficient mice lacked intraneuronal GM2 accumulation as expected, but remarkably also exhibited absence or dramatic reduction in free cholesterol. Neurons storing cholesterol consistently showed GM3 accumulation but some GM3-positive neurons lacked cholesterol storage. These findings provide a compelling argument that cholesterol sequestration in NPC1-deficient neurons is ganglioside dependent and suggest that the function of NPC1 in these cells may be more closely linked to homeostatic control of GSLs than cholesterol.

Original languageEnglish (US)
Pages (from-to)1324-1329
Number of pages6
JournalCurrent Biology
Volume13
Issue number15
DOIs
StatePublished - Aug 5 2003

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gangliosides
Gangliosides
Neurons
neurons
Cholesterol
cholesterol
glycosphingolipids
(N-acetylneuraminyl)-galactosylglucosylceramide N-acetylgalactosaminyltransferase
Glycosphingolipids
Type C Niemann-Pick Disease
mice
G(M2) Ganglioside
G(M3) Ganglioside
membrane proteins
transporters
homeostasis
Oxidoreductases
Membrane Proteins
Homeostasis
mutation

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Cholesterol accumulation in NPC1-deficient neurons is ganglioside dependent. / Gondré-Lewis, Marjorie C.; McGlynn, Robert; Walkley, Steven U.

In: Current Biology, Vol. 13, No. 15, 05.08.2003, p. 1324-1329.

Research output: Contribution to journalArticle

Gondré-Lewis, Marjorie C. ; McGlynn, Robert ; Walkley, Steven U. / Cholesterol accumulation in NPC1-deficient neurons is ganglioside dependent. In: Current Biology. 2003 ; Vol. 13, No. 15. pp. 1324-1329.
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