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Biol Bull 100: 191-198. (June 1951)
© 1951 Marine Biological Laboratory
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STUDIES ON THE ISOLATED ISLET TISSUE OF FISH. I. THE CYTOCHROME OXIDASE AND SUCCINIC DEHYDROGENASE CONTENTS OF NORMAL TOADFISH (OPSANUS TAU)

ARNOLD LAZAROW 1 and SHERWIN J. COOPERSTEIN 1

1 Department of Anatomy, Western Reserve University School of Medicine, Cleveland 6, Ohio, and Marine Biological Laboratory, Woods Hole, Mass.

1. The succinic dehydrogenase and cytochrome oxidase contents of toadfish islet tissues have been determined by measuring spectrophotometrically the rate of reduction and oxidation of cytochrome c under standardized conditions.

2. The succinic dehydrogenase content of islet tissue was much lower than heart, liver, kidney or brain, and of the same order of activity as testis, ovary, muscle and gill.

3. The ratio of succinic dehydrogenase (a cytochrome c-reducing enzyme) to cytochrome oxidase (the cytochrome c-oxidizing enzyme) in islet tissues was low when compared to muscle, brain, liver and heart.

4. The relation of these findings to the selective destruction of the pancreatic beta cells by alloxan has been discussed.






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Copyright © 1951 by the Marine Biological Laboratory.