MANIFESTATION OF STEM CELLS IN THE COLONIAL INTERNAE OF RHIZOCEPHALA PELTOGASTERELLA GRACILIS AND SACCULINA
POLYGENEA AT THE PARASITIC STAGE OF THE LIFE CYCLE
V. V. Isaeva,1 A. I. Shukalyuk,1 E. A. Kizilova 1
1 Institute of Marine Biology FEB RAS, Vladivostok, and 2 Institute of Cell Biology and Genetics SB RAS,
Novosibirsk, Russia;
1 e-mail: inmarbio@mail.primorye.ru
The colonial internae of two decapod parasites Peltogasterella gracilis and Sacculina polygenea (Crustacea: Cirripedia: Rhizocephala) were
studied in vitro by histological, and histochemical methods. We found stem cells, characterized by basophilic cytoplasm, a large nucleus and nucleolus, and a high alkaline
phosphatase activity. The cytochemical manifestation of alkaline phosphatase activity in totipotent stem cells of the colonial rhizocephala is the first evidence of commonality
in the functional characteristics of embryonic stem cells in vertebrate and invertebrate animals of such different taxa as the mammals and Crustacea.
Key words: stem cells, Rhizocephala, interna, alkaline phosphatase
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