Cyclodextrin mediates rapid changes in lipid balance in Npc1 mice without carrying cholesterol through the bloodstream
Autor: | Benny Liu, Bing Liu, Joyce J. Repa, Yelenis Mari, Anna M. Taylor |
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Rok vydání: | 2012 |
Předmět: |
medicine.medical_specialty
Lipoproteins Spleen Inflammation macrophage QD415-436 Biology liver Biochemistry Mice chemistry.chemical_compound Endocrinology Niemann-Pick C1 Protein Lysosome Internal medicine medicine Animals Niemann-Pick type C Cells Cultured Research Articles Mice Knockout Mice Inbred BALB C Cholesterol Macrophages beta-Cyclodextrins Intracellular Signaling Peptides and Proteins Proteins Niemann-Pick Disease Type C Cell Biology Lipid Metabolism Sterol 2-Hydroxypropyl-beta-cyclodextrin Cytosol medicine.anatomical_structure chemistry Cholesteryl ester Cytokines spleen lipids (amino acids peptides and proteins) NPC1 medicine.symptom Lysosomes cholesterol balance lipoprotein profiles |
Zdroj: | Journal of Lipid Research, Vol 53, Iss 11, Pp 2331-2342 (2012) |
ISSN: | 0022-2275 |
DOI: | 10.1194/jlr.m028241 |
Popis: | An injection of 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) to mice lacking Niemann Pick type C (NPC) protein results in delayed neurodegeneration, decreased inflammation, and prolonged lifespan. Changes in sterol balance observed in Npc1(-/-) mice 24 h after HP-β-CD administration suggest that HP-β-CD facilitates the release of accumulated lysosomal cholesterol, the molecular hallmark of this genetic disorder. Current studies were performed to evaluate the time course of HP-β-CD effects. Within 3 h after HP-β-CD injection, decreases in cholesterol synthesis rates and increases in cholesteryl ester levels were detected in tissues of Npc1(-/-) mice. The levels of RNAs for target genes of sterol-sensing transcription factors were altered by 6 h in liver, spleen, and ileum. Despite the cholesterol-binding capacity of HP-β-CD, there was no evidence of increased cholesterol in plasma or urine of treated Npc1(-/-) mice, suggesting that HP-β-CD does not carry sterol from the lysosome into the bloodstream for ultimate urinary excretion. Similar changes in sterol balance were observed in cultured cells from Npc1(-/-) mice using HP-β-CD and sulfobutylether-β-CD, a variant that can interact with sterol but not facilitate its solubilization. Taken together, our results demonstrate that HP-β-CD works in cells of Npc1(-/-) mice by rapidly liberating lysosomal cholesterol for normal sterol processing within the cytosolic compartment. |
Databáze: | OpenAIRE |
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