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Biomedical subjects

B Hentzer

Publications and source records attributed to B Hentzer.

At least 19 recordsLinked to original sources
PubMed1979

Dermatomyositis with universal calcinosis. A histopathological and electron optic study.

Biopsies from a 5-year-old girl with dermatomyositis and universal calcinosis were studied histopathologically and by means of electron optical techniques. The dermis was infiltrated by fibroblasts, lymphocytes and plasma cells. In the lower part of the dermis, dense basophilic areas were present. In the vicinity of these areas irregular elastic fibers appeared. In the electron microscope these elastic fibers appeared mineralized to varying degrees. The mineral part was identified as calcium apatite (either calcium-hydroxy-apatite or calcium fluoroapatite) by X-ray microanalysis and selected area diffraction. No calcification was observed outside the elastic fibers.

Calcinosis↗
PubMed1979

Chronic hepatitis B infection in male homosexuals.

Ten cases of hepatitis B virus infection were identified among asymptomatic male homosexuals. These patients shared a number of characteristics: A subclinical origin and course of infection; Persistence of HGsAg for periods exceeding six to 25 months; Persistent GPT elevation of two to five times upper normal limit; Morphological changes in the liver with portal and parenchymal inflammation (chronic persistent hepatitis, six cases; non-specific reactive hepatitis, 2 cases; cirrhosis and acute hepatitis with signs of chronicity, one case each). HBeAg was found in six cases, anti-HBe in none. These results indicate that screening for hepatitis B should be performed whenever these individuals come under medical attention in order to detect asymptomatic chronic liver diseases and to detect these silent vectors of an infection that presently shows an increased frequency among homosexuals.

Carrier State↗
PubMed1979

Adult human skin maintained in organ culture: I. The ultrastructure of the acellular compartment of connective tissue.

Collagenolytic enzymes are produced by cultured skin explants. During cultivation the acellular compartment of the dermal connective tissues is digested away. The ultrastructure of the connective tissue resorption has been studied in human skin maintained in organ culture for 2--10 weeks. The connective tissue changes are: (1) Collagen fibrils with normal axial periodicity but decreasing diameters. On cross sections these fibrils have irregular outlines, while the longitudinal sections show fibrils separated into thin bundles of filaments 40--80 A thick with preserved normal axial periodicity. (2) Cross-banded filamentous aggregations (CBFA) consisting of fine parallel filaments 25 A thick and without axial periodicity. The CBFA has 350 A thick bands at 525 A intervals. At the end of the cultivation, the CBFA are replaced by solitary filaments 25 A thick. (3) The elastic fibres show no marked changes of the amorphous matrix, while the fibrils disappear. The loss of collagen and elastic fibrils during cultivation of the skin gives direct evidence of connective tissue degradation. The described changes are discussed in relation to previous ultrastructural studies on connective tissue resorption of various tissues.

Adolescent↗
PubMed1979

Intracellular collagen fibrils in cultured human skin.

During cultivation, the collagen fibrils of skin explants are broken down. The cells of the explants participate in this resorption. The ultrastructure of the intracellular degradation of collagen fibrils of cultured human skin has been examined. Intracellular collagen fibrils occur in fibroblasts, macrophages, smooth muscle cells and unidentifiable cells. Normal collagen fibrils are engulfed and appear within membrane-bounded tubes of the cytoplasm. Primary lysosomes fuse with the tubes. Degraded intracellular collagen fibrils are frequently present in secondary lysosomes and show decreasing diameters, filamentous splitting, loss of axial periodicity, variable stainability and cross-banded filamentous aggregates. The changes in the intracellular collagen fibrils are identical with those seen in the extracellular space. The present study demonstrates that various cell types in dermis are involved in collagen fibril degradation and that the lysosomes play an important part in the intracellular resorption.

Cells, Cultured↗
PubMed1978

Fibrodysplasia (myositis) ossificans progressiva treated with disodium etidronate.

Two patients with fibrodysplasia ossificans progressiva (FOP) were treated with disodium etidronate, a disodium salt of ethane-1-hydroxy-1, 1-diphosphonic acid (EHPD) for two years; both had multiple ectopic ossifications of connective tissue. Regular follow-up showed no improvement in joint movement whilst laboratory examination revealed an increase in the serum phosphorus level. Serum calcium and urinary phosphorus excretion remained within normal limits. The urinary calcium excretion varied with the dose of EHDP. X-ray examination showed significant reduction in size and density of the ectopic ossifications, while the density of bones during and after EHDP therapy remained normal. Development of new ossification was inhibited in the active phase of the disease. Suspected side-effects of the drug were occult blood in stools, skin petechiae, and amenorrhoea. Previous reports on the EHDP treatment of disorders with ectopic ossification are summarised.

Adult↗
PubMed1978

A clinical study of 32 patients with oral discoid lupus erythematosus.

Thirty-two patients (26 females, six males) with discoid lupus erythematosus of the oral mucosa have been studied. Patients with signs of dissemination were classified according to accepted criteria. Four patients had systemic lupus erythematosus as well as oral discoid lesions. Twenty-one patients had discoid skin lesions. Eleven patients had oral discoid lesions without involvement of the skin. The time of onset of the oral discoid lesions rnaged from 6 to 75 years with a mean of 41 years. The mean druation of the oral lesions was 4.2 years. Symptoms from the oral discoid lesions were present in 75% of the patients. The clinical appearance varied and some lesions were difficult to differentiate from oral leukoplakia or from the lesions seen in oral lichen planus. The oral discoid lesions were most often seen on the buccal mucosa, the gingiva, labial mucosa and vermilion border. The oral lesions were infected by yeasts in more than half of thepatients.

Adolescent↗
PubMed1978

Enzymatic liberation of viable cells of human skin.

To obtain viable cells from normal human skin, clostridial collagenase was used. Crude collagenase digestion of collagen fibres and basal lamina results in free dermal cells and sheets of epidermis. The collagenase was tested at various concentrations, solvents and incubation periods. The specimens digested were either split or full thickness skin of varying size. The optimal result was obtained by using small (3mm across) split skin pieces incubated in 2 mg/ml collagenase. The choice of solvent MEM, MEM supplemented with serum, and Tris buffer, was less important. 3 hours' incubation the epidermis was peeled off in sheets and finally dissociated by trypsin-EDTA. The corium was completely digested after 6 hours. After 6 hours' incubation no viable cells could be seen. The epidermal cells appeared mainly as polygonal cells of various sizes and a few little dendritic cells. The dermal cells had a heterogeneous morphology during the first weeks of cultivation. After 2 weeks the cells appeared as fibroblast-like cells.

Cell Separation↗
PubMed1978

Deposits of complement and immunoglobulins in dermal and synovial vessels in psoriasis.

Deposits of complement C3 and/or immunoglobulin were found in the vessel walls and/or at the dermal-epidermal junction in skin lesions of all of 11 patients with psoriatic arthritis and guttate psoriasis. Similar deposits were seen in 6 out of 15 patients with psoriasis vulgaris. Synovial tissue available from 2 patients revealed deposits in the vessel walls.

Complement C3↗
PubMed1978

Salpeter-induced dermal changes electron-microscopically indistinguishable from pseudoxanthoma elasticum.

Salpeter-induced calcium deposits in ten patients showed a close clinical and histopathological similarity to the lesions of pseudoxanthoma elasticum. By electron microscopy and selected area diffraction analyses of the calcium deposits we find the changes indistinguishable from the changes previously described in involved skin of patients suffering from PXE. Clinically our patients were compared with the fourteen patients with traumatic calcification previously described.

Aged↗
PubMed1977

The ultrastructural changes of Leishmania tropica after treatment with pentamidine.

The effect of the antiprotozoal drug pentamidine on the ultrastructure of the amastigote stage of Leishmania tropica was studied. The most remarkable change introduced by the treatment occurred in the kinetoplast-mitochondrion complex. All mitochondria were extremely enlarged and most kinetoplasts disintegrated into a network of fine filaments. The flagellar pocket was frequently dilated and filled with various quantities of double-membrane bounded bodies ejected from the pocket wall. The multivesicular bodies and lipid droplets were enlarged. The number of ribosomal granules decreased. Many protozoa had an irregular shape and damaged internal structure. The drug-induced changes of L. tropica are discussed in relation to similar effects previously observed in trypanosomes.

Amidines↗
PubMed1977

Apatite crystals in pseudoxanthoma elasticum: a combined study using electron microscopy and selected area diffraction analysis.

Calcium deposits in elastic fibers of involved skin of patients suffering from pseudoxanthoma elasticum have previously been reported. In the present work, the crystalline structure and composition were studied. Involved skin was obtained from 5 patients. Bright-field and dark-field electron microscopy and selected area electron diffraction of the calcium deposits were applied. The study demonstrates calcium apatite crystals.

Apatites↗
PubMed1977

The ultrastructure of Leishmania tropica in skin lesions.

The ultrastructure of the amastigote stage of Leishmania tropica has been studied. The present work reports on new observations on the fine structure of the basal body, prokinosome and flagellum. The basal body is composed of a centriole-like structure and a transitional zone continuous with the proximal part of the flagellum. The centriole-like part consists of nine peripheral triplet tubules and an indistinct dense central core. The transitional zone consists of nine peripheral doublet tubules and two central cylinders. The centriole-like prokinosome is present parallel and close to the basal body. The flagellum arises from the transitional zone of the body and has the classical axoneme (9+2) structure. However, at the tip of the flagellum the central tubules are replaced by one of the peripheral doublet tubules. The ultrastructural findings, as compared with previous studies of Leishmania, are discussed.

Adult↗
PubMed1977

Fibrodysplasia ossificants progressiva.

Two cases of fibrodysplasia ossificans progressiva are reported. Both patients were females and had suffered from the disease since birth. The characteristic anomalies of great toes and thumbs associated with multiple ectopic ossifications of the connective tissue are described. Fasciae, tendons, ligaments, and joint capsules of the proximal parts of the extremities and the dorsal aspect of the trunk were involved. The muscle atrophy was probably a secondary phenomenon.

Adult↗
PubMed1977

Ultrastructure of prolapsed disc.

Prolapsed tissue and removed interspace contents were obtained during hemilaminectomy for disc prolapse. The ultrastructure of the tissue was studied. Division of the material into annulus fibrosus and nucleus pulposus proved to be inaccurate. Chondrocytes were always the predominant cell type and could be classified into normal, cloning and necrotized types. Matrix vesicles were found in relation to the haloes of chondrocytes and seemed to be products of disintegrated chondrocytes. Findings of crystals in the vesicles were rare. The intercellular substance showed degraded collagen fibrils, which could be seen in spindle shaped cells as well. A dense amorphous material interpersed with collagen fibrils seemed to be a glycoprotein. A few elastic fibres were found, but without any evidence of severe degeneration. These findings represent changes occuring in cells and in the intercellular substance.

Adult↗
PubMed1977

Ultrastructure of dermal connective tissue in fibrodysplasia ossificians progressiva.

The ultrastructure of dermal connective tissue in two patients suffering from fibrodysplasia ossificans progressiva (syn myositis o.p.) was studied. The disorder starts with soft tissue swelling which subsequently ossify. The connective tissue of various organs may be affected. No defects in calcium metabolism have been discovered. It was intended to study the primary event which initiates the ossification. The present ultrastructural study demonstrates an accumulation of proteoglycan microfibrils as well as glycoprotein material in dermal connective tissue. Both substances are prerequisites of calcification resulting from the binding of calcium and phosphorus ions. A subsequent release of proteolytic enzymes in the tissues may be set free the bound iones and, thus, initiate mineralization.

Calcium↗
PubMed1976

Dissociation of human adult epidermal cells by disulfide-reducing agents and subsequent trypsinization.

Primary cultures of epidermal cells from human adult skin were dissociated by dithiothreitol (DTT) with subsequent trypsinization. After treatment with disulfide reducing agents, the desmosomes were either destroyed or showed a homogeneous ultrastructure. Trypsin separated the homogeneous desmosomes, whereas cell membranes, organelles, and nuclei remained undamaged. Trypsin did not influence normal desmosomes. A suspension of human epidermal cells was recultivated in new flasks. Two types of cells grew in the cultures--polygonal and spindle-shaped. The polygonal cells were maintained for 30 to 60 days and grew slowly. The spindle-shaped cells were leucine-amino-peptidase negative, grew actively, and were subcultured.

Adult↗