Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

Leal-Zanchet, Ana María

doi:10.1590/s0101-81752003000300007

Cited by 2 publications

(1 citation statement)

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“…The existence of three main types of secretory cells in salivary glands of opisthobranchian and pulmonate gastropods-two types of mucocytes and granular (enzymatic) cellshas been recognized by the majority of authors (among the most recent, Lobo da Cunha, 2000;Pirger et al, 2004;Fischer et al, 2006;Lobo da Cunha et al, 2009). At the same time, in several works, in Pulmo nata, up to seven to ten variants of secretory cells have been identified (Boer et al, 1967;Walker, 1970;Beltz, Gelperin, 1979;Leal Zanchet, 2003;Moura et al, 2004). Since, among many cells, there are traced sev eral intermediate forms, it seems probable that some of the cell types described in the literature, including the pseudochromosomal cells, serocytes, etc., repre sent only stages of the secretory cycle or immature forms of glandular cells.…”

Section: Discussionmentioning

confidence: 99%

Evolutionary regularities of development of somatic polyploidy in salivary glands of gastropod mollusks: V. Subclasses Opisthobranchia and Pulmonata

Anisimov

Zyumchenko

2012

Cell Tiss. Biol.

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Abstract⎯Salivary glands of 25 species of Opisthobranchia and Pulmonata gastropod mollusks were studied with the use of histochemical methods and cytophotometry of DNA in cellular nuclei. In the secretory epi thelium, cells of three main types are identified: granular cells (with granular glycoprotein inclusions), muco cytes I (containing sulphatized acid mucopolysaccharides), and mucocytes II (containing neutral and acid nonsulphatized polysaccharides and protein), as well as epithelial ciliated cells and cells of ducts. It is shown that the salivary gland secretory cells of all studied mollusk species are polyploidized, but to different degree. In most species, the maximal degree of polyploidy estimated by the DNA content amounts to 64-128c. Giant polyploidy-up to 4096c-is revealed in salivary gland cells of Tritonia diomedea. The functional properties due to the peculiarities of nutrition of different molluscan species and phylogenetic tendencies of develop ment of somatic polyploidy in the class of Gastropoda are discussed. The high degree of obligatory polyp loidization revealed in salivary gland cells of the opisthobranchian and pulmonate mollusks is considered as a peculiar cytological arogenesis as compared with allogenic, facultative, and slight manifestations of polyp loidy in prosobranchian gastropod mollusks. The probable causes of such differences are due to the euthy neural type of organization of the central nervous system and to the giant neuronal polyploidy in opisthobran chian and pulmonate mollusks. The causes, mechanisms, and significance of such correlations are so far unclear.

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