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Distribution of the extracellular matrix proteins tenascin, fibronectin, and vitronectin in fetal, infant, and adult human spleens

KA Liakka and HI Autio-Harmainen

Department of Pathology, University of Oulu, Finland.

Using immunohistochemistry, we investigated the distribution of the extracellular matrix (ECM) glycoproteins tenascin, fibronectin, and vitronectin in fetal [16-24 gestational weeks (GW)], infant (40 GW), and adult human spleens to clarify the presence of these proteins during different phases of maturation. In the red and white pulp, tenascin and fibronectin were constant components of the reticular fibers from the age of 18 GW onwards, whereas vitronectin was seen only in adult spleens. The immunohistochemical staining patterns of tenascin and fibronectin remained unchanged at different fetal ages. Ring fibers, which are modified basement membranes around venous sinuses, became visible relatively late, and in adult spleens they contained both tenascin and vitronectin but lacked fibronectin. The composition of the ring fibers is therefore clearly different from that of ordinary basement membranes, which have not been reported to contain tenascin or vitronectin. The rapidly increasing number of reticular fibers in the spleen at the age of approximately 18 GW corresponds with the beginning of lymphatic colonization. Reticular fibers, rich in ECM glycoproteins, form a framework to which cells can migrate and attach. We suggest that the composition of these fibers might be important for lymphatic colonization and function of the spleen.

Volume 40, Issue 8, pp. 1203-1210, 08/01/1992
Copyright © 1992 by The Histochemical Society


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