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Toxicologic Pathology
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Journal Article

Subcellular Distribution of Styrene Oxide in Rat Liver

Gian Maria Pacifici

Department of General Pathology, Medical School, University of Pisa, Italy, and Department of Clinical Pharmacology, Karolinksa Institute, Huddinge University Hospital, Huddinge, Sweden.

Lulgi Cuoci

Department of General Pathology, Medical School, University of Pisa, Italy, and Department of Clinical Pharmacology, Karolinksa Institute, Huddinge University Hospital, Huddinge, Sweden.

Anders Rane

Department of General Pathology, Medical School, University of Pisa, Italy, and Department of Clinical Pharmacology, Karolinksa Institute, Huddinge University Hospital, Huddinge, Sweden.

The subcellular distribution of (3H)-styrene-7,8-oxide was studied in the rat liver. The compound was added to liver homogenate to give a final concentration of 2 times 10–5; 2 times 10–4 and 2 times 10–3 M. Subcellular fractions were obtained by differential centrifugation. Most of styrene oxide (59-88%) was associated with the cytosolic fraction. Less than 15 percent of the compound was retrieved in each of the nuclear, mitochondrial and microsomal fractions. A considerable percentage of radioactivity was found unextractable with the organic solvents, suggesting that styrene oxide reacted with the endogenous compounds. The intracellular distribution of this epoxide was also studied in the perfused rat liver. Comparable results with those previously described were obtained. The binding of styrene oxide to the cytosolic protein was investigated by equilibrium dialysis and ultrafiltration. Only a small percentage of the compound was bound to protein.

Toxicologic Pathology, Vol. 12, No. 1, 69-73 (1984)
DOI: 10.1177/019262338401200111
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