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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Elevated cholesterol and decreased sterol carrier protein-2 in peroxisomes from AS-30D hepatoma compared to normal rat liver.

Peroxisomes were isolated from AS-30D hepatoma and compared to normal rat liver cells for the purpose of investigating the cholesterol accumulation in the hepatoma cells. Cholesterol was found to be approximately 10-fold higher relative to protein in AS-30D peroxisomes as compared to peroxisomes from normal liver. The peroxisomes from the hepatoma cells were found to be more stable; catalase was not released from these peroxisomes during isolation or osmotic shock of the peroxisomal fraction. The elevated cholesterol level may stabilize the peroxisomal membrane. Sterol carrier protein-2 ( SCP-2) levels were measured using a radioimmunoassay (RIA), which indicated the highest concentration of SCP-2 to be in peroxisomes. Hepatoma peroxisomes had a lower concentration of SCP-2 (2.5 micrograms/mg) than normal liver peroxisomes (8 micrograms/mg). Approximately half of all SCP-2 detected was found to be soluble in both hepatoma and normal rat liver cells. Immunoblots from both rat liver and AS-30D fractions demonstrated the presence of the 14-kDa form of SCP-2. The liver fractions also had a 57-kDa immunoreactive protein, which was barely detectable in the AS-30D fractions. The low abundance of the high molecular weight form of SCP-2 from hepatoma peroxisomes and the lower amounts of SCP-2 detected in the AS-30D peroxisomes may be related to the accumulation of cholesterol in the cells.[1]

References

  1. Elevated cholesterol and decreased sterol carrier protein-2 in peroxisomes from AS-30D hepatoma compared to normal rat liver. Lyons, H.T., Kharroubi, A., Wolins, N., Tenner, S., Chanderbhan, R.F., Fiskum, G., Donaldson, R.P. Arch. Biochem. Biophys. (1991) [Pubmed]
 
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