Mechanisms responsible for long-term survival of adult rat hepatocytes in the presence of phenobarbital in primary culture.

The mechanisms, by which phenobarbital (PB) supports the survival of adult rat hepatocytes in primary culture, were investigated. PB altered the shape of rat erythrocytes to produce cup-formed cells and protected them from hypotonic hemolysis. Anesthetics (ketamine, lidocaine, mepivacaine, and bupivacaine) and an anti-inflammatory agent (indomethacin), which are also known to protect erythrocytes from hypotonic hemolysis by stabilizing their membranes, efficiently supported the survival of hepatocytes in primary culture. Furthermore, the well-known biological membrane stabilizers, such as cholesterol and vitamin E, also showed the maintenance effect on primary cultured hepatocytes. PB effectively reduced the leakage of lactate dehydrogenase from hepatocytes caused by chenodeoxycholic acid in primary culture. Rotenone and amobarbital, which act repressively on the PB-sensitive site in the respiratory chain and are known to inhibit the mitochondrial formation of active oxygen species with NAD-linked substances, effectively prolonged the hepatocyte survival in primary culture. Elevation of oxygen tension in primary culture remarkably decreased the hepatocyte survival rate, which was preserved by addition of antioxidant substances, such as vitamin C, vitamin E, bifemelane, selenite, and superoxide dismutase. On the other hand, in the presence of PB, the hepatocyte survival rate hardly changed with the elevation of oxygen tension. From these findings, it seems that PB stabilizes the hepatocyte membranes and reduces the mitochondrial formation of active oxygen species and that the stabilized functions of membrane and the reduction of oxidative stress result in the prolonged survival of hepatocytes in primary culture.

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