The unique fibrillar matrix of the marine sponge Stelletta grubii

Journal of Morphology
T L SimpsonLidia Scalera-Liaci

Abstract

In this astrophorid sponge, both intercellular fibrils and spongin microfibrils are elaborated with the former forming exceptionally dense arrangements throughout much of the matrix. Fibrils are very dense below the surface where they surround the small silica asters and throughout the cortex in the form of bundles that can form pseudo-plywood arangements. In the endosome, fibril bundles are isolated and fewer in number. The surfaces of the large silica spicules are uniquely encased by intercellular fibrils or compacted intercellular fibrils that form a type of "fibrillar spongin" or spongin microfibrils intermixed with fibrils. Well developed microfibrillar spongin, intermixed with some fibrils, encases larger spicules below the sponge surface within the tissue and extends above the tissue surrounding spicules that emerge from the sponge thus placing this fibrillar matrix in direct contact with the sea water. The results of other studies suggest that the fibrils and microfibrils of this species are collagenous. The elaboration of these special matrices indicates that the differentiation of spongocytes (which secrete microfibrils) is weak and that the activity of lophocytes (which secrete fibril bundles) is highly labile. The v...Continue Reading

References

Aug 1, 1977·Experimental Cell Research·P K MüllerK Kühn
Aug 1, 1977·Developmental Biology·K von der MarkR L Trelstad
May 1, 1956·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·J GROSSM ROUGVIE
Apr 1, 1984·Journal of Morphology·Nicole Boury-EsnaultJean Vacelet

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Citations

May 20, 2006·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·Carsten EckertWerner E G Müller

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