PubMed Health⌕ Search

Biomedical subjects

H Mensing

Publications and source records attributed to H Mensing.

At least 91 records · Page 5Linked to original sources
PubMed1984

Pattern of collagen synthesis and chemotactic response of fibroblasts derived from mucopolysaccharidosis patients.

For comparative studies on the migratory potential we screened fibroblast strains derived from mucopolysaccharidosis (MPS) patients regarding their differential response to chemotactic stimuli and analysed their production of extracellular matrix components. Indirect immunofluorescence staining of MPS-fibroblasts showed the same distribution of type I and type III collagen and of fibronectin as in controls. Biochemical quantification of type I and type III collagen demonstrated an unaltered ratio of these collagen types, although the total amount of newly synthesized collagens was slightly reduced in fibroblasts from MPS patients. Whereas the synthesis of major extracellular matrix components was close to normal, the response of the MPS cells to chemotactic stimuli was greatly affected. Chemotactic migration was improved when fibroblasts were pretreated with medium conditioned by normal fibroblasts, although they never reached normal levels.

Cells, Cultured↗
PubMed1984

Leukotriene B4 induces in vitro fibroblast chemotaxis.

In vitro fibroblast chemotaxis was studied in the presence of synthetic leukotriene B4 (LTB4) and of supernatants from ionophore-stimulated lymphocytes, monocytes, and basophils (LMB-S). LTB4 and LMB-S induced a dose-related, directed migration of human and rat embryonic fibroblasts. By checkerboard analysis, this response was chemotactic and not chemokinetic. Optimal migration toward LTB4 occurred at 10(-8) M concentrations, while higher concentrations were inhibitory. The LMB-S contained two types of fibroblast chemotactic factors, one that corresponded to LTB4 and one additional, heat labile, non-dialyzable substance of greater than 10 kilodaltons. LTB4 and LMB-S were inactive against transformed human connective tissue cells (HT 1080, McCoy) while these cells moved well in response to conditioned medium derived from confluent fibroblast monolayer cultures. These results suggest that LTB4 is a specific chemoattractant for fibroblasts and that it acts in concert with other chemotactic factors derived from inflammatory leukocytes to regulate the influx of fibroblasts to tissue sites.

Animals↗
PubMed1984

Effect of vitamin A and its derivatives on collagen production and chemotactic response of fibroblasts.

Vitamin A and several other retinoids were added to fibroblast cultures in order to study possible alterations in biochemical properties and cellular responsiveness. The proliferation of cells was inhibited as the concentration of retinoids increased from 10(-9) to 10(-5) mol/l. Synthesis of non-collagenous proteins and production of both type I and type III collagen were decreased. The onset of type III collagen synthesis by tendon fibroblasts in culture was delayed. Furthermore, the chemotactic response of fibroblasts to fibroblast-conditioned medium was markedly reduced in the presence of retinoids (10(-6) to 10(-12) mol/l).

Acitretin↗
PubMed1984

'Composites'--an aberrant structure of the collagen fibril.

Ultrastructural investigations are presented concerning the 'composite'-like collagen changes in different kinds of connective tissue diseases. Most impressing findings were observed in processes causing an extensive elastotic degeneration. The morphology of the 'composite'-like collagen changes is described, and some hypotheses are discussed with regard to the pathomechanism of their generation.

Collagen↗
PubMed1984

[Bullous pemphigoid in childhood].

Bullous pemphigoid is a rather rare disease in childhood. A case report is given about a seven-year-old girl suffering from juvenile bullous pemphigoid and the differential diagnosis is discussed with regard to the other bullous diseases in children. Some clues were noted in the case history of our patient concerning an effective treatment using erythromycin in bullous pemphigoid. A short summary is presented about the theoretical basis with respect to this therapeutical procedure.

Age Factors↗
PubMed1983

[Acrodermatitis induced by zinc deficiency].

A patient with acrodermatitis as a result of zinc deficiency is reported. In spite of the characteristic signs the required substitution of zinc is often delayed, because the entity is confused with other, more common forms of dermatitis.

Acrodermatitis↗
PubMed1983

[Chemotactic activity of fibroblasts in mucopolysaccharidoses].

Certain clinical symptoms such as hernias or joint contracture in patients with mucopolysaccharidoses (MPS) cannot be explained as direct consequences of the disturbed glycosaminoglycan metabolism. They may be related to secondary changes of connective tissue components. The glycoprotein fibronectin is a constituent of connective tissue with a high affinity to polyanions such as heparan sulfate or heparin. Fibronectin in addition is a potent stimulus for fibroblasts to migrate chemotactically. We studied this cell property in MPS fibroblasts. The chemotactic activity of all MPS types was diminished. MPS II fibroblasts were chemotactically inactive. When the cells were corrected for the lacking enzyme by adding conditioned medium from control fibroblasts, the chemotactic migration increased except for MPS type II cells. The known enzyme defect in the degradation process of glycosaminoglycans in MPS results in lysosomal storage of degradation products and in addition causes changes of other cell properties.

Chemotaxis↗
PubMed1983

A study on fibroblast chemotaxis using fibronectin and conditioned medium as chemoattractants.

Chemotaxis of human embryo fibroblasts and rhabdomyosarcoma cells was studied in a blind well Boyden chamber using fibronectin as a chemoattractant. The cell strains studied show a differential response to fibronectin, a fact which may mirror the origin of the cells, that means normal skin or tumor associated tissue, respectively. Furthermore, we detected another chemoattractive fraction synthesized and secreted by fibroblasts in addition to fibronectin and collagen derived fragments. Initial experiments demonstrated the proteinous nature of the component(s) and provided some information on the biochemical features.

Cells, Cultured↗
PubMed1982

[Experiences with high-dose cisplatin therapy in metastasized malignant melanoma].

14 patients with advanced malignant melanoma were treated in 36 therapy cycles with cisplatin. 8 patients had been pretreated with dacarbazine and 6 had received additional BCG immunotherapy. 4 patients had been irradiated after surgical removal of lymph node metastases. All patients showed significant tumor progression. 4 patients were treated showing ultimately disseminated melanoma with widespread visceral involvement. 5 patients with lymph node metastases had been operated radically and were treated postoperatively. Cisplatin was administered as a 24-h high-dose therapy (200 mg or 120-200 mg/m2) under forced mannitol diuresis, treatment cycles were repeated monthly. Of all the patients, 1 showed complete remission of supraclavicular metastases lasting for 6 months until now. 1 patient showed an initial minor response with subsequent stabilization without appearance of additional metastases for 1 year. 2 patients who had received cisplatin postoperatively showed no reappearance of tumor growth for 8 months up until now. 11 patients showed no change or progression of disease, 6 of them had received only one therapy cycle. Under clinical conditions, side effects of cisplatin treatment can be managed satisfactorily, no irreversible kidney damage could be observed under forced diuresis. As far as the above-mentioned results are concerned, antineoplastic activity of cisplatin as to advanced malignant melanoma must be considered to be of limited benefit using cisplatin as a single-agent treatment. Improvement of results might be obtained using cisplatin in a combination therapy together with other antineoplastic agents, which at the present time are being investigated in several prospective trials.

Adult↗
PubMed1982

[Werner syndrome-like disease in 3 brothers. Differential diagnosis of progeria syndrome].

A report is given on a progeroid disease affecting three brothers, 11, 13, and 14 years old. The difficult differential diagnosis of such progeroid syndromes is discussed. The clinical signs were mostly consistent with Werner's syndrome. Since some of the symptoms of this disease were not present, probably because of the young age of the patients, this progeroid syndrome was classified as Werner syndrome-like. Electronmicroscopic findings of the patients skin showed changes of the blood vessels and nerves, which were until now not described in Werner's syndrome or other progerias. The latter findings may give some hints with regard to the pathogenesis of this disease.

Adolescent↗
PubMed1981

[Vulvitis plasmacellularis Zoon (author's transl)].

A rare case of plasma-cell vulvitis (Zoon) is reported in a 53 years old female. The painful erythematous plaque affected parts of the vulva. After disappointing local treatment for three years repeated intralesional injections of triamcinolone improved the condition satisfactory.

Diagnosis, Differential↗
PubMed1981

[Surgical treatment of skin changes in cutis laxa (author's transl)].

Cutis laxa is an extremely rare genetic disorder of connective tissue. The striking dermatologic features are loose skin folds and skin laxity. Due to these folds the patients appear to be prematurely aged. Plastic surgery can improve these changes. This treatment is especially indicated in patients with the autosomal dominant type of cutis laxa where internal manifestations do not occur. We report the case of a seventeen years old boy with cutis laxa and surgical therapy.

Adolescent↗