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Blood vessels; frog; plasma membrane electron transport

In an attempt to see if frog blood vessels possess a plasma membrane electron transport system, the postcaval vein and aorta isolated from Rana tigrina were tested for their ability to reduce ferricyanide, methylene blue, and 2,6-dichloroindophenol. While the dyes remained unchanged, ferricyanide was reduced to ferrocyanide. This reduction was resistant to inhibition by cyanide and azide. Heptane extraction or formalin fixation of the tissues markedly reduced the capability to reduce ferricyanide. Denuded aortas retained only 30% of the activity of intact tissue. Our results indicate that the amphibian postcaval vein and aorta exhibit plasma membrane electron transport

Rashmi P Rao¹ K Nalini¹ J Prakasa Rao²

1. Department of Biochemistry, Kasturba Medical College, Manipal 576 104, India
2. Department of Physiology, Kasturba Medical College, Manipal 576 104, India

Published

December 2009

Manuscript received

7 September 2009

Accepted

13 October 2009

Early published

18 November 2009