Gary M Fiskum

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

H T Lyons; A Kharroubi; N Wolins; S Tenner; R F Chanderbhan; G Fiskum; R P Donaldson (Profiled Author: Gary M Fiskum)

Department of Biological Sciences, George Washington University, Washington, D.C. 20052.
Archives of biochemistry and biophysics 1991;285(2):238-45.

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 Originating Grant

• 1.

  FISKUM, GARY M

  TRANSPORT-REGULATED CALCIUM METABOLISM IN TUMOR CELLS

  1 July 1983 - 30 June 1992

  NATIONAL CANCER INSTITUTE

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