The sensitivity of Na-K and Mg Adenosine Triphosphatases (ATPases) in mouse tissues to toxaphene, a highly chlorinated camphene, was determined both in vivo and in vitro. The brain and kidney Na’- K’ ATPase activities were significantly inhibited in vitro by toxaphene. Interestingly, the inhibition was not significantly increased with an increase in the concentration of toxaphene. The oligomycin-sensitive (mitochondrial) Mg++ ATPase activities in mouse brain, kidney and liver fractions were significantly inhibited by toxaphene in a concentration-dependent fashion. The oligomycin-insensitive Mg ATPase in all tissues examined was also inhibited but less sensitive to toxaphene than mitochondrial Mg++ ATPase. In contrast to in vitro response, the brain ATPases were not altered in mice fed toxaphene by oral intubation for three days. The renal and hepatic ATPase activities were significantly decreased in toxaphene treated mice with the oligomycin-insensitive Mg++ ATPase activity being only slightly altered. Copyright © 1979, Taylor & Francis Group, LLC
