Importance of type IV collagen, laminin, and heparan sulfate proteoglycan in the regulation of labyrinthine fluid in the rat cochlear duct

1998 ◽  
Vol 255 (6) ◽  
pp. 285-288 ◽  
Author(s):  
H. Satoh ◽  
K. Kawasaki ◽  
I. Kihara ◽  
Y. Nakano
Keyword(s):  
Heparan Sulfate ◽  
Type Iv Collagen ◽  
Heparan Sulfate Proteoglycan ◽  
Sulfate Proteoglycan ◽  
Cochlear Duct ◽  
Type Iv

scholarly journals Heterogenous distribution of type IV collagen, entactin, heparan sulfate proteoglycan, and laminin among renal basement membranes as demonstrated by quantitative immunocytochemistry.

1989 ◽  
Vol 37 (6) ◽  
pp. 885-897 ◽  
Author(s):  
M Desjardins ◽  
M Bendayan
Keyword(s):  
Heparan Sulfate ◽  
Type Iv Collagen ◽  
Protein A ◽  
Heparan Sulfate Proteoglycan ◽  
Basement Membranes ◽  
Sulfate Proteoglycan ◽  
Type Iv ◽  
Membrane Components ◽  
Convoluted Tubules ◽  
Basement Membrane Components

Type IV collagen, entactin, heparan sulfate proteoglycan, and laminin antigenic sites were revealed on various rat renal basement membranes by use of protein A-gold immunocytochemistry. The basement membranes of the proximal and distal convoluted tubules, those of Bowman's capsule and glomerulus, and the mesangial matrix were labeled for all the antigens but to differing extents. Control experiments confirmed the specificity of these labelings. Quantitative evaluation revealed an important heterogeneity for each antigen among the various basement membranes. This heterogeneity suggests that the basement membrane components must arrange themselves in different ways, possibly to account for differences in functional properties of the various renal structures.

scholarly journals Immunogold quantitation of laminin, type IV collagen, and heparan sulfate proteoglycan in a variety of basement membranes.

1988 ◽  
Vol 36 (3) ◽  
pp. 271-283 ◽  
Author(s):  
D S Grant ◽  
C P Leblond
Keyword(s):  
Heparan Sulfate ◽  
Type Iv Collagen ◽  
Collagen Iv ◽  
Heparan Sulfate Proteoglycan ◽  
Basement Membranes ◽  
Enamel Organ ◽  
Sulfate Proteoglycan ◽  
Lamina Densa ◽  
Type Iv ◽  
Reichert's Membrane

A series of basement membranes was immunolabeled for laminin, type IV collagen, and heparan sulfate proteoglycan in the hope of comparing the content of these substances. The basement membranes, including thin ones (less than 0.3 micron) from kidney, colon, enamel organ, and vas deferens, and thick ones (greater than 2 micron), i.e., Reichert's membrane, Descemet's membrane, and EHS tumor matrix, were fixed in formaldehyde, embedded in Lowicryl, and treated with specific antisera or antibodies followed by anti-rabbit immunoglobulin bound to gold. The density of gold particles, expressed per micron2, was negligible in controls (less than or equal to 1.1), but averaged 307, 146, and 23, respectively, for laminin, collagen IV, and proteoglycan over the thick basement membranes (except for Descemet's membranes, over which the density was 16, 5, and 34, respectively) and 117, 72, and 64, respectively, over the lamina densa of the thin basement membranes. Lower but significant reactions were observed over the lamina lucida. Interpretation of the gold particle densities was based on (a) the similarity between the ultrastructure of most thick basement membranes and of the lamina densa of most thin basement membranes, and (b) the biochemical content of the three substances under study in the EHS tumor matrix (Eur J Biochem 143:145, 1984). It was proposed that thick basement membranes (except Descemet's) contained more laminin and collagen IV but less heparan sulfate proteoglycan than the lamina densa of thin basement membranes. In the latter, there was a fair variation from tissue to tissue, but a tendency towards a similar molar content of the three substances.

scholarly journals Basement membrane-like matrix of teratocarcinoma-derived endodermal cells: presence of laminin and heparan sulfate in the matrix at points of attachment to cells.

1983 ◽  
Vol 31 (1) ◽  
pp. 35-45 ◽  
Author(s):  
I Leivo
Keyword(s):  
Cell Membrane ◽  
Basement Membrane ◽  
Heparan Sulfate ◽  
Type Iv Collagen ◽  
Heparan Sulfate Proteoglycan ◽  
Ruthenium Red ◽  
Basement Membranes ◽  
Sulfate Proteoglycan ◽  
Type Iv ◽  
The Matrix

Teratocarcinoma-derived endodermal PYS-2 cells are known to synthesize an extracellular matrix containing the basement membrane molecules laminin, type IV collagen, and heparan sulfate proteoglycan as major constituents (I. Leivo, K. Alitalo, L. Risteli, A. Vaheri, R. Timpl, J. Wartiovaara, Exp Cell Res 137:15-23, 1982). Immunoferritin techniques with specific antibodies were used in the present study to define the ultrastructural localization of the above constituents in the fibrillar network. Laminin was detected in matrix network adjacent to the basal cell membrane and in protruding matrix fibrils that connect the matrix to the cell membrane. Ruthenium red-stainable heparinase-sensitive 10- to 20-nm particles were often present at the junction of the attachment fibrils and the matrix network, or along the attachment fibrils. A corresponding distribution of ferritin label was observed for basement membrane heparan sulfate proteoglycan. Type IV collagen was found in the matrix network but not in the attachment fibrils. The results suggest that the PYS-2 cells are connected to their pericellular matrix by fibrils containing laminin associated with heparan sulfate-containing particles. These results may also have relevance for the attachment of epithelial cells to basement membranes.

scholarly journals Localization of laminin, type IV collagen, fibronectin, and heparan sulfate proteoglycan in chick retinal pigment epithelium basement membrane during embryonic development.

1985 ◽  
Vol 33 (7) ◽  
pp. 665-671 ◽  
Author(s):  
K Turksen ◽  
J E Aubin ◽  
J Sodek ◽  
V I Kalnins
Keyword(s):  
Heparan Sulfate ◽  
Type Iv Collagen ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Heparan Sulfate Proteoglycan ◽  
Sulfate Proteoglycan ◽  
Rpe Cells ◽  
Type Iv

Type IV collagen, laminin, heparan sulfate proteoglycan, and fibronectin were localized in the basement membrane (BM) of chick retinal pigment epithelium (RPE) during various stages of eye development. At different times over a 4-17 day period after fertilization, chick embryo eyes were dissected, fixed in periodate-lysine-paraformaldehyde, and 6 micron frozen sections through the central regions of the eye were prepared. Sections were postfixed in -20 degrees C methanol and stained immediately by indirect immunofluorescence using sheep anti-mouse laminin, sheep antimouse type IV collagen, rabbit anti-mouse heparan sulfate proteoglycan, and mouse monoclonal anti-porcine plasma fibronectin. Fluorescein-labeled F(ab')2 fragments of the appropriate immunoglobulins (IgGs) were used as secondary antibodies. Laminin could be readily demonstrated in the BM of the RPE during all stages of development. The staining for type IV collagen, fibronectin, and heparan sulfate proteoglycan HSPG) was less intense than that for laminin, but was also localized in the BM along the basal side of the RPE. In addition to staining the BM, antiserum to HSPG, gave a diffuse labeling from day 9 onward, above the RPE extending into the region of the photoreceptors. Whereas the intensity of staining generally increased between day 4 and day 17 of development, the distribution of the different BM components did not change. Hence the presence of type IV collagen, laminin, fibronectin, and HSPG in the BM of RPE in vivo during all the stages of development investigated supports the concept that these macromolecules are important basic components of this, and other, BMs. Furthermore, these results indicate that the composition of the BM of RPE cells in vivo is similar to the BM material deposited by RPE cells in vitro (Turksen K, Aubin JE, Sodek JE, Kalnins VI: Collagen Rel Res, 4:413-426, 1984) and that the in vitro cultures can therefore serve as a useful model for studying BM formation.

scholarly journals Localization of type IV collagen, laminin, heparan sulfate proteoglycan, and fibronectin to the basal lamina of basement membranes.

1982 ◽  
Vol 95 (1) ◽  
pp. 340-344 ◽  
Author(s):  
G W Laurie ◽  
C P Leblond ◽  
G R Martin
Keyword(s):  
Basement Membrane ◽  
Heparan Sulfate ◽  
Basal Lamina ◽  
Type Iv Collagen ◽  
Heparan Sulfate Proteoglycan ◽  
Basement Membranes ◽  
Enamel Organ ◽  
Sulfate Proteoglycan ◽  
Type Iv ◽  
Membrane Region

Electron microscopic immunostaining of rat duodenum and incisor tooth was used to examine the location of four known components of the basement-membrane region: type IV collagen, laminin, heparan sulfate proteoglycan, and fibronectin. Antibodies or antisera against these substances were localized by direct or indirect peroxidase methods on 60-microns thick slices of formaldehyde-fixed tissues. In the basement-membrane region of the duodenal epithelium, enamel-organ epithelium, and blood-vessel endothelium, immunostaining for all four components was observed in the basal lamina (also called lamina densa). The bulk of the lamina lucida (rara) was unstained, but it was traversed by narrow projections of the basal lamina that were immunostained for all four components. In the subbasement-membrane fibrous elements or reticular lamina, immunostaining was confined to occasional "bridges" extending from the epithelial basal-lamina to that of adjacent capillaries. The joint presence of type IV collagen, laminin, heparan sulfate proteoglycan, and fibronectin in the basal lamina indicates that these substances do not occur in separate layers but are integrated into a common structure.

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