Extracellular matrix biology in the lung

1996 ◽  
Vol 270 (1) ◽  
pp. L3-L27 ◽  
Author(s):  
S. E. Dunsmore ◽  
D. E. Rannels
Keyword(s):  
Extracellular Matrix ◽  
Basement Membrane ◽  
Current Knowledge ◽  
Biological Effects ◽  
Alveolar Epithelium ◽  
Basement Membranes ◽  
Model Systems ◽  
Capillary Endothelium ◽  
Future Research ◽  
Membrane Components

The lung and other organs are comprised of both cellular and extracellular compartments. Interaction of these components modulates physiological function at the organ, cellular, and subcellular levels. Extracellular components in the gas-exchange region of the lung include both noncellular interstitium and basement membranes. Connective tissue elements of the interstitium in part determine ventilatory function by contributions to tissue compliance and to resistance of the diffusion barrier. The basement membrane underlies cells of both the alveolar epithelium and the capillary endothelium; basement membrane components exert biological effects on adjacent cells through receptor-mediated interactions. This review emphasizes current knowledge concerning the composition and biological activity of extracellular matrix in the alveolar region of the lung. Matrix synthesis and turnover are also considered. Directions for future research are suggested in the context of current knowledge of the lung and other model systems.

Participation of two different mesenchymes in the developing mouse mammary gland: synthesis of basement membrane components by fat pad precursor cells

Development ◽  
1985 ◽  
Vol 89 (1) ◽  
pp. 243-257
Author(s):  
Koji Kimata ◽  
Teruyo Sakakura ◽  
Yutaka Inaguma ◽  
Masato Kato ◽  
Yasuaki Nishizuka
Keyword(s):  
Extracellular Matrix ◽  
Mammary Gland ◽  
Flank Region ◽  
Mouse Mammary Gland ◽  
Precursor Cells ◽  
Basement Membranes ◽  
Immunofluorescent Staining ◽  
Fat Pad ◽  
Matrix Products ◽  
Membrane Components

Two different types of mesenchyme, fat pad precursor cells (FP) and fibroblastic cells (MM) are involved in the morphogenesis of mammary gland epithelium of mouse embryo. Especially, an interaction between FP and the epithelium is necessary for its characteristic shaping of ductal branching structure. To assess the relative participations of the mesenchymes, we have analysed the extracellular matrix products by immunofluorescent staining method using antibodies to laminin, proteoheparan sulphate, and fibronectin. The staining patterns suggested that, after the 16th day of gestation when fatty substances first appeared in FP and the epithelial rudiments started to elongate and branch rapidly, FP initiated synthesis of laminin and proteoheparan sulphate, while MM synthesized fibronectin at all times. Attention was also paid to differences in the epithelial basement membranes (BM) concomitant with ones in the mesenchyme. BM were always stained with antibodies to laminin and proteoheparan sulphate. However, topographical differences in thickness were observed: the one facing FP, often seen at the tip region of the end bud, was thin, while the other surrounded by MM, often at the flank region of the duct, was thick. Specific elaboration of BM-like extracellular matrix products by FP may attribute to observed differences in BM thickness which are related to the characteristic shaping of the mammary gland.

scholarly journals Extracellular matrix of lymphoid tissues in the chick.

1989 ◽  
Vol 37 (5) ◽  
pp. 757-763 ◽  
Author(s):  
A Colombatti ◽  
A Poletti ◽  
A Carbone ◽  
D Volpin ◽  
G M Bressan
Keyword(s):  
Extracellular Matrix ◽  
Epithelial Cells ◽  
Basement Membrane ◽  
Basement Membranes ◽  
Intestinal Lumen ◽  
Lymphoid Tissues ◽  
White Pulp ◽  
Extracellular Matrix Components ◽  
Coarse Fibers ◽  
Distribution Of Components

We describe the immunohistochemical distribution of components of the extracellular matrix of the chick lymphoid system. In the thymus, basement membranes of epithelial cells bordering the lobules were intensely stained by laminin antibodies; fibronectin antibodies labeled the capsule and the septal matrix, and similar reactivity was seen with tropoelastin and gp 115 antibodies. No positivity was detected with any of the antibodies within the cortical parenchymal cells. Laminin was not detected in the medullary parenchyma, whereas fibronectin was present as coarse fibers. Tropoelastin and gp 115 appeared as a finer and more diffuse meshwork. In the bursa, laminin antibodies outlined the epithelial cells separating the cortex from the medulla. Fibronectin, tropoelastin, and gp 115 antibody stained the interfollicular septa and the cortical matrix, although to a different extent. Laminin was also detected in association with the interfollicular epithelium (IFE) basement membrane, whereas no staining was found underneath the follicle-associated epithelium (FAE). FAE cells not only lack a proper basement membrane but are also not separated from medullary lymphocytes by any of the other extracellular matrix components were investigated. Consequently, medullary lymphocytes are not sequestered, and can come easily into contact with antigens present in the intestinal lumen. All four antibodies stained the spleen capsule and spleen blood vessels, tropoelastin and gp 115 antibodies giving the strongest reactivity. A fine trabecular staining pattern was detected with gp 115 antibodies in the white pulp.

scholarly journals Expression of extracellular matrix components is regulated by substratum.

1990 ◽  
Vol 110 (4) ◽  
pp. 1405-1415 ◽  
Author(s):  
C H Streuli ◽  
M J Bissell
Keyword(s):  
Extracellular Matrix ◽  
Epithelial Cells ◽  
Basement Membrane ◽  
Type I Collagen ◽  
Basement Membranes ◽  
Type I ◽  
Collagen Gels ◽  
Extracellular Matrix Components ◽  
Matrix Components ◽  
Cells Cultured

Reconstituted basement membranes and extracellular matrices have been demonstrated to affect, positively and dramatically, the production of milk proteins in cultured mammary epithelial cells. Here we show that both the expression and the deposition of extracellular matrix components themselves are regulated by substratum. The steady-state levels of the laminin, type IV collagen, and fibronectin mRNAs in mammary epithelial cells cultured on plastic dishes and on type I collagen gels have been examined, as has the ability of these cells to synthesize, secrete, and deposit laminin and other, extracellular matrix proteins. We demonstrate de novo synthesis of a basement membrane by cells cultured on type I collagen gels which have been floated into the medium. Expression of the mRNA and proteins of basement membranes, however, are quite low in these cultures. In contrast, the levels of laminin, type IV collagen, and fibronectin mRNAs are highest in cells cultured on plastic surfaces, where no basement membrane is deposited. It is suggested that the interaction between epithelial cells and both basement membrane and stromally derived matrices exerts a negative influence on the expression of mRNA for extracellular matrix components. In addition, we show that the capacity for lactational differentiation correlates with conditions that favor the deposition of a continuous basement membrane, and argue that the interaction between specialized epithelial cells and stroma enables them to create their own microenvironment for accurate signal transduction and phenotypic function.

scholarly journals Characterization of a novel heparan sulfate proteoglycan found in the extracellular matrix of liver sinusoids and basement membranes.

1991 ◽  
Vol 113 (5) ◽  
pp. 1231-1241 ◽  
Author(s):  
C J Soroka ◽  
M G Farquhar
Keyword(s):  
Extracellular Matrix ◽  
Basement Membrane ◽  
Heparan Sulfate ◽  
Rat Liver ◽  
Core Protein ◽  
Heparan Sulfate Proteoglycan ◽  
Basement Membranes ◽  
Sulfate Proteoglycan ◽  
Sinusoidal Cell ◽  
Space Of Disse

A novel heparan sulfate proteoglycan (HSPG) present in the extracellular matrix of rat liver has been partially characterized. Proteoglycans were purified from a high salt extract of total microsomes from rat liver and found to consist predominantly (approximately 90%) of HSPG. A polyclonal antiserum raised against this fraction specifically recognized HSPG by immunoprecipitation and immunoblotting. The intact, fully glycosylated HSPG migrated as a broad smear (150-300 kD) by SDS-PAGE, but after deglycosylation with trifluoromethanesulfonic acid only a single approximately 40-kD band was seen. By immunocytochemistry this HSPG was localized in the perisinusoidal space of Disse associated with irregular clumps of basement membrane-like extracellular matrix material, some of which was closely associated with the hepatocyte sinusoidal cell surface. It was also localized in biosynthetic compartments (rough ER and Golgi cisternae) of hepatocytes, suggesting that this HSPG is synthesized and deposited in the space of Disse by the hepatocyte. The anti-liver HSPG IgG also stained basement membranes of hepatic blood vessels and bile ducts as well as those of kidney and several other organs (heart, pancreas, and intestine). An antibody that recognizes the basement membrane HSPG found in the rat glomerular basement membrane did not precipitate the 150-300-kD rat liver HSPG. We conclude that the liver sinusoidal space of Disse contains a novel population of HSPG that differs in its overall size, its distribution and in the size of its core protein from other HSPG (i.e., membrane-intercalated HSPG) previously described in rat liver. It also differs in its core protein size from HSPG purified from other extracellular matrix sources. This population of HSPG appears to be a member of the basement membrane HSPG family.

scholarly journals Basement membrane proteoglycans in glomerular morphogenesis: chondroitin sulfate proteoglycan is temporally and spatially restricted during development.

1993 ◽  
Vol 41 (3) ◽  
pp. 401-414 ◽  
Author(s):  
K J McCarthy ◽  
K Bynum ◽  
P L St John ◽  
D R Abrahamson ◽  
J R Couchman
Keyword(s):  
Basement Membrane ◽  
Chondroitin Sulfate ◽  
Basement Membranes ◽  
Chondroitin Sulfate Proteoglycan ◽  
Sulfate Proteoglycan ◽  
Electron Microscopic ◽  
Ureteric Buds ◽  
Membrane Components ◽  
Almost All ◽  
Basement Membrane Components

We previously reported the presence of a basement membrane-specific chondroitin sulfate proteoglycan (BM-CSPG) in basement membranes of almost all adult tissues. However, an exception to this ubiquitous distribution was found in the kidney, where BM-CSPG was absent from the glomerular capillary basement membrane (GBM) but present in other basement membranes of the nephron, including collecting ducts, tubules, Bowman's capsule, and the glomerular mesangium. In light of this unique pattern of distribution and of the complex histoarchitectural reorganization occurring during nephrogenesis, the present study used light and electron microscopic immunohistochemistry to examine the distribution of BM-CSPG and basement membrane heparan sulfate proteoglycan (BM-HSPG) during prenatal and postnatal renal development in the rat. Our results show that the temporal and spatial pattern of expression of BM-CSPG during nephrogenesis is unlike that reported for other basement membrane components such as laminin, fibronectin, and BM-HSPG, all of which can be found in the earliest formed basement membranes of the vesicle-stage nephron. Although BM-CSPG is present in the basement membranes of the invading vasculature and ureteric buds, its first appearance in nephron basement membrane occurs during the late comma stage. In capillary loop-stage glomeruli of prenatal animals, BM-CSPG is present in the presumptive mesangial matrix but undetectable in the GBM. However, as postnatal glomerular maturation progresses BM-CSPG is also found in both the lamina rara interna and lamina densa of the GBM in progressively increasing amounts, being most evident in the GBM of 21-day-old animals. Micrographs of glomeruli from 42-day-old animals show that BM-CSPG gradually disappears from the GBM and, by 56 days after birth, appears to be completely absent from the GBM, its pattern of distribution resembling that of the adult animal. Our results show that BM-CSPG is not required for the initial assembly of basement membranes but may in fact serve to stabilize basement membrane structure after histoarchitectural reorganization is completed.

scholarly journals Formation of basement membranes in the embryonic kidney: an immunohistological study

1981 ◽  
Vol 91 (1) ◽  
pp. 1-10 ◽  
Author(s):  
P Ekblom
Keyword(s):  
Extracellular Matrix ◽  
Basement Membrane ◽  
Type Iv Collagen ◽  
Basement Membranes ◽  
Glomerular Endothelial Cell ◽  
Type Iv ◽  
Endothelial Cell Differentiation ◽  
Inductive Interaction ◽  
Immunohistological Study

Specific antibodies to laminin, type IV collagen, basement-membrane proteoglycan, and fibronectin have been used in immunofluorescence microscopy to study the development of basement membranes of the embryonic kidney. Kidney tubules are known to form from the nephrogenic mesenchyme as a result of an inductive tissue interaction. This involves a change in the composition of the extracellular matrix. The undifferentiated mesenchyme expresses in the composition of the extracellular matrix. The undifferentiated mesenchyme expresses fibronectin but no detectable laminin, type IV collagen, or basement-membrane proteoglycan. During the inductive interaction, basement-membrane specific components (laminin, type IV collagen, basement membrane proteoglycan) become detectable in the induced area, whereas fibronectin is lost. While the differentiation to epithelial cells of the kidney requires an inductive interaction, the development of the vasculature seems to involve an ingrowth of cells which throughout development deposits basement-membrane specific components, as well as fibronectin. These cells form the endothelium and possibly also the mesangium of the glomerulus, and contribute to the formation of the glomerular basement membrane. An analysis of differentiation of the kidney mesenchyme in vitro in the absence of circulation supports these conclusions. Because a continuity with vasculature is required for glomerular endothelial cell differentiation, it is possible that these cells are derived from outside vasculature.

scholarly journals On Top of the Alveolar Epithelium: Surfactant and the Glycocalyx

2020 ◽  
Vol 21 (9) ◽  
pp. 3075 ◽  
Author(s):  
Matthias Ochs ◽  
Jan Hegermann ◽  
Elena Lopez-Rodriguez ◽  
Sara Timm ◽  
Geraldine Nouailles ◽  
...  
Keyword(s):  
Alveolar Epithelium ◽  
Alveolar Epithelial Cells ◽  
Capillary Endothelium ◽  
Future Research ◽  
Type I ◽  
Thorium Dioxide ◽  
Alveolar Epithelial ◽  
Surfactant System ◽  
Morphological Findings ◽  
Air Liquid Interface

Gas exchange in the lung takes place via the air-blood barrier in the septal walls of alveoli. The tissue elements that oxygen molecules have to cross are the alveolar epithelium, the interstitium and the capillary endothelium. The epithelium that lines the alveolar surface is covered by a thin and continuous liquid lining layer. Pulmonary surfactant acts at this air-liquid interface. By virtue of its biophysical and immunomodulatory functions, surfactant keeps alveoli open, dry and clean. What needs to be added to this picture is the glycocalyx of the alveolar epithelium. Here, we briefly review what is known about this glycocalyx and how it can be visualized using electron microscopy. The application of colloidal thorium dioxide as a staining agent reveals differences in the staining pattern between type I and type II alveolar epithelial cells and shows close associations of the glycocalyx with intraalveolar surfactant subtypes such as tubular myelin. These morphological findings indicate that specific spatial interactions between components of the surfactant system and those of the alveolar epithelial glycocalyx exist which may contribute to the maintenance of alveolar homeostasis, in particular to alveolar micromechanics, to the functional integrity of the air-blood barrier, to the regulation of the thickness and viscosity of the alveolar lining layer, and to the defence against inhaled pathogens. Exploring the alveolar epithelial glycocalyx in conjunction with the surfactant system opens novel physiological perspectives of potential clinical relevance for future research.

scholarly journals Histone Modifications and the Maintenance of Telomere Integrity

Cells ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 199 ◽  
Author(s):  
Meagan Jezek ◽  
Erin Green
Keyword(s):  
Histone Modifications ◽  
Current Knowledge ◽  
Telomere Maintenance ◽  
Model Systems ◽  
Future Research ◽  
Dna Double Strand Breaks ◽  
Post Translational Modifications ◽  
Strand Breaks ◽  
Integral Role ◽  
Protective Proteins

Telomeres, the nucleoprotein structures at the ends of eukaryotic chromosomes, play an integral role in protecting linear DNA from degradation. Dysregulation of telomeres can result in genomic instability and has been implicated in increased rates of cellular senescence and many diseases, including cancer. The integrity of telomeres is maintained by a coordinated network of proteins and RNAs, such as the telomerase holoenzyme and protective proteins that prevent the recognition of the telomere ends as a DNA double-strand breaks. The structure of chromatin at telomeres and within adjacent subtelomeres has been implicated in telomere maintenance pathways in model systems and humans. Specific post-translational modifications of histones, including methylation, acetylation, and ubiquitination, have been shown to be necessary for maintaining a chromatin environment that promotes telomere integrity. Here we review the current knowledge regarding the role of histone modifications in maintaining telomeric and subtelomeric chromatin, discuss the implications of histone modification marks as they relate to human disease, and highlight key areas for future research.

scholarly journals The netrin receptor DCC focuses invadopodia-driven basement membrane transmigration in vivo

2013 ◽  
Vol 201 (6) ◽  
pp. 903-913 ◽  
Author(s):  
Elliott J. Hagedorn ◽  
Joshua W. Ziel ◽  
Meghan A. Morrissey ◽  
Lara M. Linden ◽  
Zheng Wang ◽  
...  
Keyword(s):  
Basement Membrane ◽  
Cancer Metastasis ◽  
Normal Development ◽  
Basement Membranes ◽  
Membrane Interface ◽  
Anchor Cell ◽  
Membrane Components ◽  
Invasive Cell ◽  
Basement Membrane Components

Though critical to normal development and cancer metastasis, how cells traverse basement membranes is poorly understood. A central impediment has been the challenge of visualizing invasive cell interactions with basement membrane in vivo. By developing live-cell imaging methods to follow anchor cell (AC) invasion in Caenorhabditis elegans, we identify F-actin–based invadopodia that breach basement membrane. When an invadopodium penetrates basement membrane, it rapidly transitions into a stable invasive process that expands the breach and crosses into the vulval tissue. We find that the netrin receptor UNC-40 (DCC) specifically enriches at the site of basement membrane breach and that activation by UNC-6 (netrin) directs focused F-actin formation, generating the invasive protrusion and the cessation of invadopodia. Using optical highlighting of basement membrane components, we further demonstrate that rather than relying solely on proteolytic dissolution, the AC’s protrusion physically displaces basement membrane. These studies reveal an UNC-40–mediated morphogenetic transition at the cell–basement membrane interface that directs invading cells across basement membrane barriers.

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