scholarly journals Nephrotic tunnels in glomerular basement membrane as revealed by a new electron microscopic method.

1994 ◽  
Vol 4 (12) ◽  
pp. 1965-1973
Author(s):  
Z Ota ◽  
K Shikata ◽  
K Ota
Keyword(s):  
Nephrotic Syndrome ◽  
Basement Membrane ◽  
Glomerular Basement Membrane ◽  
Three Dimensional ◽  
Minimal Change Nephrotic Syndrome ◽  
Renal Tissue ◽  
Honeycomb Structure ◽  
Ultrastructural Changes ◽  
Electron Microscopic ◽  
Transmission Electron

To clarify the ultrastructure in situ of the normal human glomerular basement membrane and ultrastructural changes of the glomerular basement membrane in patients with nephrotic syndrome, specimens of normal renal tissue and specimens from patients with membranous nephropathy, lupus nephritis, minimal change nephrotic syndrome, diabetic nephropathy, and Alport's syndrome were obtained. Specimens were examined by transmission electron microscopy by the newly devised "tissue negative staining method." Normal glomerular basement membrane showed a three-dimensional lattice-like meshwork of fibrils measuring 1.9 +/- 0.4 nm in diameter that formed numerous uniform, round, oval, or polygonal pores 2.5 +/- 0.4 nm in short diameter and 2.8 +/- 0.5 nm in long dimension. The nephrotic glomerular basement membrane revealed varying degrees of ultrastructural defects, the most prominent being tunnels and cavities. Tortuous tunnels measuring approximately 15 to 50 nm in diameter penetrated the entire glomerular basement membrane. Cavities of various shapes measuring 15 to 200 nm in diameter were diffusely scattered in the glomerular basement membrane and occasionally aggregated to form a honeycomb structure that occupied the whole thickness of the glomerular basement membrane. These defects appeared to be the pathway for protein leakage.

Morphologic alteration in the muscles of patients with hypokalemic periodic paralysis or myopathy

1990 ◽  
Vol 48 (3) ◽  
pp. 222-223
Author(s):  
T. Shimizu ◽  
Y. Muranaka ◽  
I. Ohta ◽  
N. Honda
Keyword(s):  
Clinical Manifestations ◽  
Quadriceps Muscle ◽  
Honeycomb Structure ◽  
Periodic Paralysis ◽  
Ultrastructural Changes ◽  
Hypokalemic Periodic Paralysis ◽  
Electron Microscopic ◽  
Tubular Aggregates ◽  
Hypokalemic Myopathy ◽  
Transmission Electron

There have been many reports on ultrastructural alterations in muscles of hypokalemic periodic paralysis (hpp) and hypokalemic myopathy(hm). It is stressed in those reports that tubular structures such as tubular aggregates are usually to be found in hpp as a characteristic feature, but not in hm. We analyzed the histological differences between hpp and hm, comparing their clinical manifestations and morphologic changes in muscles. Materials analyzed were biopsied muscles from 18 patients which showed muscular symptoms due to hypokalemia. The muscle specimens were obtained by means of biopsy from quadriceps muscle and fixed with 2% glutaraldehyde (pH 7.4) and analyzed by ordinary method and modified Golgimethod. The ultrathin section were examined in JEOL 200CX transmission electron microscopy.Electron microscopic examinations disclosed dilated t-system and terminal cistern of sarcoplasmic reticulum (SR)(Fig 1), and an unique structure like “sixad” was occasionally observed in some specimens (Fig 2). Tubular aggregates (Fig 3) and honeycomb structure (Fig 4) were also common characteristic structures in all cases. These ultrastructural changes were common in both the hypokalemic periodic paralysis and the hypokalemic myopathy, regardless of the time of biopsy or the duration of hypokalemia suffered.

Electron microscopic radioautographic studies on the incorporation of 3H proline in the glomerular basement membrane (GBM) in antistreptococcal-cell-membrane (SCM) injected mice

1984 ◽  
Vol 42 ◽  
pp. 188-189
Author(s):  
R.P. Nayyar ◽  
C.F. Lange ◽  
J. L. Borke
Keyword(s):  
Body Weight ◽  
Cell Membrane ◽  
Basement Membrane ◽  
Glomerular Basement Membrane ◽  
Mesangial Matrix ◽  
Electron Microscopic ◽  
Group A ◽  
Injection Protocol

Streptococcal cell membrane (SCM) antiserum injected mice show a significant thickening of glomerular basement membrane (GBM) and an increase in mesangial matrix within 4 to 24 hours of antiserum administration (1,2,3). This study was undertaken to evaluate the incorporation of 3H proline into glomerular cells and GBM under normal and anti-SCM induced conditions. Mice were administered, intraperitoneally, 0.1 ml of normal or anti-SCM serum followed by a 10 µC/g body weight injection of 3H proline. Details of the preparation of anti-SCM (Group A type 12 streptococcal pyogenes) and other sera and injection protocol have been described elsewhere (2). After 15 minutes of isotope injection a chase of cold proline was given and animal sacrificed at 20 minutes, 1,2,4,8,24 and 48 hours. One of the removed kidneys was processed for immunofluorescence, light and electron microscopic radioautographic studies; second kidney was used for GBM isolation and aminoacid analysis.

The blister of porphyria cutanea tarda: A Scanning and Transmission Electron Microscopic study

1986 ◽  
Vol 44 ◽  
pp. 334-335
Author(s):  
Veronika Burmeister ◽  
R. Swaminathan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Basement Membrane ◽  
Middle Age ◽  
Porphyria Cutanea Tarda ◽  
Minor Trauma ◽  
Electron Microscopic ◽  
Transmission Electron Microscopic Study ◽  
Transmission Electron ◽  
Transmission Electron Microscopic

Porphyria cutanea tarda (PCT) is a disorder of porphyrin metabolism which occurs most often during middle age. The disease is characterized by excessive production of uroporphyrin which causes photosensitivity and skin eruptions on hands and arms, due to minor trauma and exposure to sunlight. The pathology of the blister is well known, being subepidermal with epidermodermal separation, it is not always absolutely clear, whether the basal lamina is attached to the epidermis or the dermis. The purpose of our investigation was to study the attachment of the basement membrane in the blister by comparing scanning with transmission electron microscopy.

High-resolution transmission electron microscopic investigations of molybdenum thin films on faceted α-Al2O3

2005 ◽  
Vol 38 (2) ◽  
pp. 260-265 ◽  
Author(s):  
Leonore Wiehl ◽  
Jens Oster ◽  
Michael Huth
Keyword(s):  
High Resolution ◽  
Three Dimensional ◽  
Epitaxial Relationship ◽  
Electron Microscopic ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
High Resolution Images ◽  
Α Al2o3 ◽  
Relationship Of

Epitaxially grown Mo films on a faceted corundum (α-Al2O3)mplane were investigated by transmission electron microscopy. Low- and high-resolution images were taken from a cross-section specimen cut perpendicular to the facets. It was possible to identify unambiguously the crystallographic orientation of these facets and explain the considerable deviation (∼10°) of the experimental interfacet angle, as measured with atomic force microscopy (AFM), from the expected value. For the first time, proof is given for a smooth \{10\bar{1}1\} facet and a curvy facet with orientation near to \{10\bar{1}\bar{2}\}. Moreover, the three-dimensional epitaxial relationship of an Mo film on a faceted corundummsurface was determined.

Membranous nephropathy

2010 ◽  
pp. 3985-3988
Author(s):  
Dwomoa Adu
Keyword(s):  
Prostate Cancer ◽  
Systemic Lupus Erythematosus ◽  
Nephrotic Syndrome ◽  
Basement Membrane ◽  
Autoimmune Diseases ◽  
Outer Surface ◽  
Glomerular Basement Membrane ◽  
Lupus Erythematosus ◽  
Membranous Nephropathy ◽  
Systemic Lupus

Membranous nephropathy, which accounts for 20 to 30% of cases of the nephrotic syndrome in adults, is defined histologically by the presence of subepithelial immune deposits on the outer surface of the glomerular basement membrane. The immune mechanisms that lead to this are uncertain, and most cases are of unknown cause (idiopathic), but the condition can be associated with autoimmune diseases (systemic lupus erythematosus), malignancy (in 10% of cases, most commonly lung and prostate cancer), drugs, and infections....

A Scanning and Transmission Electron Microscopic Study of Rotavirus-Induced Intestinal Lesions in Neonatal Gnotobiotic Dogs

1986 ◽  
Vol 23 (4) ◽  
pp. 443-453 ◽  
Author(s):  
C. A. Johnson ◽  
T. G. Snider ◽  
W. G. Henk ◽  
R. W. Fulton
Keyword(s):  
Epithelial Cells ◽  
Ultrastructural Changes ◽  
Post Inoculation ◽  
Electron Microscopic ◽  
Intestinal Villi ◽  
Villus Atrophy ◽  
Intestinal Lesions ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Subsequent Propagation

Neonatal gnotobiotic dogs orally inoculated with canine rotavirus had ultrastructural changes limited to the jejunal and ileal regions of the small intestine. Early scanning electron microscopic findings consisted of swollen villus epithelial cells, denuded foci on intestinal villi, and slight to moderate villus atrophy. Later changes were slight villus atrophy with no denuded intestinal villi. Transmission electron microscopic changes in villus epithelial cells from 12 to 48 hours post-inoculation included: rotavirus particles associated with intracytoplasmic vacuoles near the terminal web and apical tubules; viral particles in dilated cisternae of rough endoplasmic reticulum; and moderate numbers of necrotic cells having no microvilli, swollen mitochondria, membrane-bound lipid-like material in the cytoplasm, clumped chromatin around the periphery of the nucleus, and disruption of the cytoplasmic membrane. In jejunum and ileum at 72 to 154 hours post-inoculation, there were fewer necrotic villus epithelial cells and fewer virus particles. In addition, the ultrastructural morphology of the majority of the villus epithelial cells was similar to crypt epithelium. These studies showed that rotavirus infected the villus epithelial cells with subsequent propagation of the rotavirus and destruction of villus epithelial cells.

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