Cystathionine -Synthase in the CNS
of Masu Salmon Oncorhynchus masou (Salmonidae)
and Carp Cyprinus carpio (Cyprinidae)

E. V. Pushchina^a,1, A. A. Varaksin^a, and D. K. Obukhov^b

^aInstitute of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia

^bSt. Petersburg State University, St. Petersburg, Russia

Received September 8, 2010

Abstract—Immunohistochemical labeling showed the presence of cystathionine -synthase in neurons of the
ventral spinal column, medulla oblongata, the cells and fibers of the cerebellum, optic tectum, and telencephalon
of the masu salmon Oncorhynus masou and the carp Cyprinus carpio. We found considerable interspecies differ-
ences in the localization and optical density of immunoreactive structures in brain areas of masu salmon and carp
which are presumably related to the specificities of the feeding and behavior of these fishes. In carp, the medulla
oblongata and spinal cord had intensely labeled vessels, which were absent in masu salmon. The periventricular
area of the medulla oblongata and ventral and lateral areas of the cerebellum of the carp had strongly CBS-positive
cells without outgrowths. The sizes of cells and their location in the brain and interrelations with H₂S-producing
neurons suggest that periventricular area of the carp brain has H₂S-producing glia.

Keywords: cystathionine -synthase, hydrogen sulfide, bony fishes, Salmonidae, Cyprinidae, postnatal neuro-
genesis, vascular regulation, gaseous neurotransmitter

DOI: 10.1134/S1819712411010090

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