The association of hemidesmosome-like plaque and dense coating with the pinocytic uptake of a heterologous fibrillar protein (amyloid) by macrophages

Amyloid neuropathy: immunocytochemical localization of intra- and extracellular immunoglobulin light chains

Sural nerve specimens from ten patients with amyloidosis (hereditary, associated with lymphoproliferative disorders, or of unknown origin) and peripheral neuropathy were investigated by immunohistochemistry at the light and electron microscopic level. Peroxidase-antiperoxidase and immunogold techniques were applied to glutaraldehyde-fixed, osmicated and epoxy-embedded tissue. In five cases, four of which associated with lymphoproliferative disorders, amyloid deposits strongly and exclusively reacted with antibodies to kappa or lambda light chains, respectively. By electron microscopy, bundles of immunogold-labelled amyloid fibrils could be identified in coated and uncoated single membrane-bound vesicles of endoneurial macrophages. Schwann cells did not contain intracellular amyloid but their processes were entangled in amyloid fibrils and their basement membranes were sometimes fused with the fibrillar masses. It is concluded that immunoglobulin light chains in AL (amyloid of immunoglobulin light chain origin) amyloidosis precipitate, forming amyloid fibrils, in the presence of, and presumably with the assistance of, endoneurial cells. Inefficiency of phagocytosis appears to be one of the major causes for the deleterious effects of amyloid.

The importance of stroma in morphogenesis and functional activity of urogenital epithelium

Urogenital morphogenesis and cytodifferentiation are presented in the context of the epithelial-stromal interaction. The essential role of stroma in the processes is reviewed.

The possible role of hemidesmosomes in neonatally estrogen-induced selection of a permanently altered abnormal vaginal epithelium

In untreated and neonatally-estrogenized (E) Balb/c mice the numbers of hemidesmosomes per basal cell cross section (HD/bccs) gradually increases from 0.07 HD/bccs on day 1 to about 2 to 3 HD/bccs on day 4 postpartum. In untreated mice the incidence of HD's increases and plateaus at 6 to 7 HD/bccs on days 5 and 8, while during this same period in E-treated mice the incidence is increased to 14 to 15 HD/bccs. In 5-day-old E-treated mice two types of basal vaginal epithelial cells can be recognized: basophilic cells rich in HD (19.5 +/- 2.1 HD/bccs) and light cells containing only 5.3 +/- 3.3 HD/bccs. The basophilic, HD-rich cells appear to replace the lighter HD-poor cells. The hypothesis that HD's are involved in the estradiol-induced selection of an abnormal vaginal epithelium is discussed.

An electron microscopic study of the cavernous bodies in the lamprey gill filaments

The cavernous body in the lamprey gill filament was studied by electron microscopy. This body lies along the outer border of the axial plate of each gill filament and freely communicates with an afferent filament artery. Two series of blood channels run alternately, passing through the cavernous body, and lead to the marginal channels in the secondary lamellae. On the other hand, narrow blood spaces left in the cavernous body lead to the blood lacunae in the axial plate (osmoregulatory region) and to those in the secondary lamellae (respiratory region). All the blood in the cavernous body is finally collected by an efferent filament artery. The cavernous body is traversed by numerous trabeculae and collagenous columns which run diagonally in the blood spaces to connect the walls of the cavernous body. All the walls of the cavernous body, including trabeculae and collagenous columns, are completely surrounded by the cytoplasmic flanges of specialized cells called here "cavernous body cells." These cells are about 30 mu in diameter and characterized by (1) association with collagenous columns or trabeculae and also by the presence of (2) coated caveolae and vesicles, (3) vacuoles and (4) cytoplasmic granules in their cytoplasm. These cells are considered to be related to the pillar cells in origin because of their close association with collagenous columns or trabecule. The functional significance of the cavernous body and the cavernous body cells is discussed.