DAO 33:235-238 (1998)  -  doi:10.3354/dao033235

Hyperplastic growth of mucous cells in the mantle of the mussel Modiolus kurilensis from a heavily polluted area of Amursky Bay, Sea of Japan

L. N. Usheva*, N. A. Odintsova

Institute of Marine Biology, Far East Branch of Russian Academy of Science, 690041, Vladivostok, Russia

ABSTRACT: The histology of an external mantle growth in 1 of 500 Modiolus kurilensis from a heavily polluted area of Amursky Bay, Sea of Japan, was described. The growth consisted of subepithelial basophilic mucous cells containing glucosaminoglycans, eosinophilic large-granular cells with proteins and neutral polysaccharides, and mixed (acid + neutral mucopolysaccharides) cell types. Some subepithelial eosinophilic and basophilic gland cells were dividing and seemed to be the source of tumor growth. The mitotic index of growth cells reached 0.5% on some growth sections; however, many mitoses were pycnotic. The emergence of the tumor on the mussel mantle is probably related to a compensatory or regenerative hyperplasia of subepithelial mucous cells.


KEY WORDS: Mussel · Mantle · Hyperplasia · Mucous cells · Mitotic index


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