Production and polarized secretion of basement membrane components by glomerular epithelial cells

1992 ◽  
Vol 262 (1) ◽  
pp. F131-F137 ◽  
Author(s):  
Y. Natori ◽  
Y. M. O'Meara ◽  
E. C. Manning ◽  
A. W. Minto ◽  
J. S. Levine ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Basement Membrane ◽  
Type Iv Collagen ◽  
Enzyme Linked Immunosorbent Assay ◽  
Type Iv ◽  
Polarized Secretion ◽  
Glomerular Epithelial Cells ◽  
Basolateral Side ◽  
Membrane Components ◽  
Basement Membrane Components

To study the formation of basement membrane by glomerular epithelial cells (GECs), production and secretion of type IV collagen and laminin by rat GECs in culture were evaluated. GECs produced two chains of type IV collagen (180 and 170 kDa) in the ratio of approximately 2 to 1, when immunoprecipitated with antibody to type IV collagen of mouse Engelbreth-Holm-Swarm (EHS) sarcoma. GECs also produced proteins that were precipitated by antibody to EHS laminin, i.e., two bands each in the positions of the A and B chains of mouse laminin. On enzyme-linked immunosorbent assay (ELISA), type IV collagen and laminin were found mainly in the cell-associated fraction and in the subepithelial culture medium. Confluent GECs on membrane filters formed a tight barrier against the flux of macromolecules. Under these conditions, 80% of newly synthesized and secreted matrix proteins were detected in the basolateral medium. Moreover, treatment with ammonium chloride, which is known to affect polarized secretion, caused both type IV collagen and laminin to be secreted via the basolateral and apical surfaces in similar amounts. These results indicate that cultured GECs are polarized and that they produce and secrete basement membrane components via the basolateral side.

Differential deposition of basement membrane components during formation of the caudal neural tube in the mouse embryo

Development ◽  
1987 ◽  
Vol 99 (4) ◽  
pp. 509-519
Author(s):  
K.S. O'Shea
Keyword(s):  
Basement Membrane ◽  
Type Iv Collagen ◽  
Heparan Sulphate ◽  
Heparan Sulphate Proteoglycan ◽  
Sulphate Proteoglycan ◽  
Secondary Neurulation ◽  
Type Iv ◽  
Posterior Neuropore ◽  
Membrane Components ◽  
Basement Membrane Components

The distribution of basement membrane and extracellular matrix components laminin, fibronectin, type IV collagen and heparan sulphate proteoglycan was examined during posterior neuropore closure and secondary neurulation in the mouse embryo. During posterior neuropore closure, these components were densely deposited in basement membranes of neuroepithelium, blood vessels, gut and notochord; although deposition was sparse in the midline of the regressing primitive streak. During secondary neurulation, mesenchymal cells formed an initial aggregate near the dorsal surface, which canalized and merged with the anterior neuroepithelium. With aggregation, fibronectin and heparan sulphate proteoglycan were first detected at the base of a 3- to 4-layer zone of radially organized cells. With formation of a lumen within the aggregate, laminin and type IV collagen were also deposited in the forming basement membrane. During both posterior neuropore closure and secondary neurulation, fibronectin and heparan sulphate proteoglycan were associated with the most caudal portion of the neuroepithelium, the region where newly formed epithelium merges with the consolidated neuroepithelium. In regions of neural crest migration, the deposition of basement membrane components was altered, lacking laminin and type IV collagen, with increased deposition of fibronectin and heparan sulphate proteoglycan.

scholarly journals Puromycin Aminonucleoside Suppresses Integrin Expression in Cultured Glomerular Epithelial Cells

2001 ◽  
Vol 12 (4) ◽  
pp. 758-766 ◽  
Author(s):  
UMA KRISHNAMURTI ◽  
BING ZHOU ◽  
WEI-WEI FAN ◽  
EFFIE TSILIBARY ◽  
ELIZABETH WAYNER ◽  
...  
Keyword(s):  
Epithelial Cell ◽  
Epithelial Cells ◽  
Basement Membrane ◽  
Glomerular Basement Membrane ◽  
Type Iv Collagen ◽  
Cell Detachment ◽  
Puromycin Aminonucleoside ◽  
Glomerular Epithelial Cell ◽  
Type Iv ◽  
Glomerular Epithelial Cells

Abstract. Puromycin aminonucleoside (PAN)-induced nephrosis is a well-described model of human idiopathic nephrotic syndrome, but the mechanism of PAN's effect is not completely understood. Because PAN injection into rats results in retraction of glomerular epithelial cell foot processes and glomerular epithelial cell detachment, it was hypothesized that PAN might alter the contacts between these cells and the glomerular basement membrane. The major integrin expressed by glomerular epithelial cells is α3β1, which mediates attachment of these cells to extracellular matrix proteins including type IV collagen. T-SV 40 immortalized human glomerular epithelial cells were used to study PAN's effects on α3β1 expression, as well as that of podocalyxin and the slit diaphragm component ZO-1. Glomerular epithelial cells were seeded into plastic flasks and allowed to attach and proliferate for 48 h. The cells were then incubated for another 48 h in media containing 0, 0.5, or 5.0 μg/ml PAN. PAN exposure resulted in dose-dependent decreases in α3 and β1 expression, both at the protein level and at the mRNA level. This was accompanied by a significant decrease in the adhesion of glomerular epithelial cells to type IV collagen. PAN did not affect ZO-1 protein expression. Treatment with PAN increased the expression of podocalyxin at the protein and mRNA levels. Reduced glomerular epithelial cell expression of α3β1 integrins and impaired adhesion to type IV collagen may contribute to the glomerular epithelial cell detachment from glomerular basement membrane seen in the PAN nephrosis model.

scholarly journals Glomerular epithelial cells secrete a glomerular basement membrane-degrading metalloproteinase.

1992 ◽  
Vol 2 (9) ◽  
pp. 1388-1397
Author(s):  
R Johnson ◽  
H Yamabe ◽  
Y P Chen ◽  
C Campbell ◽  
K Gordon ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Basement Membrane ◽  
Glomerular Basement Membrane ◽  
Type Iv Collagen ◽  
Dependent Manner ◽  
Type Iv Collagenase ◽  
Glomerular Diseases ◽  
Major Band ◽  
Type Iv ◽  
Glomerular Epithelial Cells

Cultured rat glomerular epithelial cells (GEC) were examined for their ability to release extracellular matrix-degrading proteinases with [3H]gelatin as substrate. GEC-conditioned media, under serum-free conditions, contained modest amounts of gelatinase activity (1 to 10 U/mg of protein); the activity was maximal at neutral pH, was inhibited by zinc chelators, was not inhibited by tissue inhibitor of metalloproteinase-2, and could not be further activated by trypsin or organomercurials. Gelatin substrate sodium dodecyl sulfate-polyacrylamide gels of GEC-conditioned medium revealed several zones of lysis, with molecular sizes of 150 kd (major band), and 220, 86 to 93, and 52 to 54 kd (minor bands). Northern blot analysis demonstrated that the GEC metalloproteinase(s) were distinct from the 68- to 72-kd type IV collagenase/gelatinase present in mesangial cells or the 92-kd type IV collagenase present in neutrophils. The GEC gelatinolytic activity also degraded insoluble type IV collagen in glomerular basement membrane in a dose-dependent manner. The major metalloproteinase activity responsible for the type IV collagen degradation has a molecular size of 150 kd with a type IV collagen substrate gel. Thus, GEC produce several neutral metalloproteinases, which, by virtue of their substrate specificity, may play an important role in glomerular basement membrane remodeling and in glomerular diseases characterized by alterations in basement membrane permeability.

Bleomycin and cyclophosphamide increase pulmonary type IV procollagen mRNA in mice

1990 ◽  
Vol 259 (2) ◽  
pp. L47-L52
Author(s):  
D. G. Hoyt ◽  
J. S. Lazo
Keyword(s):  
Gene Expression ◽  
Steady State ◽  
Pulmonary Fibrosis ◽  
Basement Membrane ◽  
Type Iv Collagen ◽  
Subcutaneous Infusion ◽  
Type Iv ◽  
Steady State Levels ◽  
Membrane Components ◽  
Basement Membrane Components

Constant 7-day subcutaneous infusion of bleomycin (100 mg/kg) induces pulmonary fibrosis in C57Bl/6N mice, whereas BALB/cN mice are relatively resistant. In contrast, cyclophosphamide (200 mg/kg, ip) induces fibrosis in BALB/cN mice, whereas C57Bl/6N mice are resistant. The effect of these drugs on the pulmonary levels of mRNA encoding the major basement membrane components, laminin and type IV collagen, relative to poly (A+)RNA was determined in both C57Bl/6N and BALB/cN mice. In the sensitive C57Bl/6N mice, bleomycin increased alpha 1IV and alpha 2IV procollagen mRNA/poly (A+)RNA twofold in the absence of increases in laminin A, B1, and B2 mRNA/poly (A+)RNA. In the relatively resistant BALB/cN mice, bleomycin did not alter alpha 1IV procollagen mRNA/poly (A+)RNA and only transiently increased laminin A, B1, B2, and alpha 2IV procollagen mRNA/poly (A+)RNA. Similarly, cyclophosphamide increased alpha 1IV and alpha 2IV procollagen mRNA/poly (A+)RNA twofold in the sensitive BALB/cN mice and not in C57Bl/6N mice. Laminin mRNAs/poly (A+)RNA were not increased by cyclophosphamide in either strain. Thus, in these models, pulmonary fibrosis is preceded by a coordinate increase in steady-state levels of mRNA encoding basement membrane procollagen but is not associated with an increase in laminin gene expression

Immunohistochemical Distribution of Basement Membrane Type IV Collagen and Laminin in Synovial Sarcoma

1993 ◽  
Vol 79 (6) ◽  
pp. 427-432 ◽  
Author(s):  
Marcello Guarino
Keyword(s):  
Basement Membrane ◽  
Type Iv Collagen ◽  
Spindle Cell ◽  
Epithelial Tissue ◽  
Cell Component ◽  
Spindle Cell Component ◽  
Type Iv ◽  
Synovial Sarcomas ◽  
Membrane Components ◽  
Basement Membrane Components

Aims To investigate the distribution of basement membrane components type IV collagen and laminin in synovial sarcomas. Methods Paraffin sections from four synovial sarcomas were studied by the peroxidase-antiperoxldase procedure using specific antibodies to type IV collagen and laminin. Results Type IV collagen and laminin immunoreactivity was confined around epithelial areas in biphasic tumors. Several interruptions and discontinuities of the linear basement membrane profile were seen in sites of transition between mesenchymal and epithelial tissue. Moreover, a spot-like immunoreactivity was often observed in the spindle cell component of biphasic tumors. Monophasic tumors were either negative or showed a pericellular staining for both type IV collagen and laminin. Conclusions The distribution of basement membrane components is clearly related to the formation of epithelial elements in biphasic synovial sarcoma. The spot-like immunoreactivity of the spindle cell component, and the basement membrane interruptions at the boundary between mesenchymal and epithelial tissue, are both consistent with early basement membrane formation by developing epithelium. These findings support the concept that synovial sarcomas are basically soft tissue carcinosarcomas and that the epithelial component of the tumors develops by conversion of mesenchyme to epithelium.

scholarly journals What is Known of the Production of Basement Membrane Components

1983 ◽  
Vol 31 (1A_suppl) ◽  
pp. 159-163 ◽  
Author(s):  
G.W. Laurie ◽  
C.P. Leblond
Keyword(s):  
Golgi Apparatus ◽  
Basement Membrane ◽  
Type Iv Collagen ◽  
Secretory Granules ◽  
Basement Membranes ◽  
Type Iv ◽  
Stage Of Development ◽  
Membrane Components ◽  
Endodermal Cells ◽  
Basement Membrane Components

Immunohistochemistry was used to identify basement membrane components and examine their production by associated cells. Four substances were identified in a series of basement membranes in rats aged 20 days to 34 months, namely, type IV collagen, laminin, heparan sulfate proteoglycan, and fibronectin. They were then all localized to the basal lamina part of basement membranes and, presumably, are integrated within this layer. The production of type IV collagen was first examined in the embryonic endodermal cells associated with Reichert's membrane in the rat parietal yolk sac. The rough endoplasmic reticulum (rER), Golgi apparatus, and putative secretory granules of endodermal cells were immunostained, suggesting that these organelles participated in the biogenesis of type IV collagen. However, in rats aged 20 days or more, the cells associated with basement membranes were usually unstained. An exception was noted in the continually growing incisor tooth where the endothelial cells at the proliferating end usually showed immunostaining of rER and Golgi apparatus. It is, therefore, proposed that the formation of type IV collagen for basement membrane occurs at an early stage of development in the life of producer cells. Little is known of the formation of other basement membrane components during development, but there is immunohistochemical evidence that laminin and fibronectin are produced along the same secretory pathway as type IV collagen.

Sign in / Sign up

Export Citation Format

Share Document