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  • Electronic Resource  (5)
  • Prognose  (2)
  • Abbreviations25OHD 25-Hydroxyvitamin D  (1)
  • B-Zell-Lymphome  (1)
  • Cytoskeleton  (1)
  • 1
    ISSN: 1432-2307
    Keywords: Cytoskeleton ; Wound healing ; Fibrosis ; Extracellular matrix ; Cytokine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Granulation tissue fibroblasts (myofibroblasts) develop several ultrastructural and biochemical features of smooth muscle (SM) cells, including the presence of microfilament bundles and the expression of α-SM actin, the actin isoform present in SM cells and myoepithelial cells and particularly abundant in vascular SM cells. Myofibroblasts have been suggested to play a role in wound contraction and in retractile phenomena observed during fibrotic diseases. When contraction stops and the wound is fully epithelialized, myofibroblasts containing α-SM actin disappear, probably as a result of apoptosis, and the scar classically becomes less cellular and composed of typical fibroblasts with well-developed rough endoplasmic reticulum but with no more microfilaments. In contrast, α-SM actin expressing myofibroblasts persist in hypertrophic scars and in fibrotic lesions of many organs, including stroma reaction to epithelial tumours, where they are allegedly involved in retractile phenomena as well as in extracellular matrix accumulation. The mechanisms leading to the development of myofibroblastic features remain to be investigated. In vivo and in vitro investigations have shown that γ-interferon exerts an antifibrotic activity at least in part by decreasing α-SM actin expression whereas heparin increases the proportion of α-SM actin positive cells. Recently, we have observed that the subcutaneous administration of transforming growth factor-β1 to rats results in the formation of a granulation tissue in which α-SM actin expressing myofibroblasts are particularly abundant. Other cytokines and growth factors, such as platelet-derived growth factor, basic fibroblast growth factor and tumour necrosis factor-α, despite their profibrotic activity, do not induce α-SM actin in myofibroblasts. In conclusion, fibroblastic cells are relatively undifferentiated and can assume a particular phenotype according to the physiological needs and/or the microenvironmental stimuli. Further studies on fibroblast adaptation phenomena appear to be useful for the understanding of the mechanisms of development and regression of pathological processes such as wound healing and fibrocontractive diseases.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 159 (2000), S. 412-415 
    ISSN: 1432-1076
    Keywords: Key words Malignant infantile osteopetrosis ; Rickets ; Neonate ; Vitamin D deficiency ; Abbreviations25OHD 25-Hydroxyvitamin D ; 1,25(OH)2D 1,25-Dihydroxyvitamin D ; PTH Parathyroid hormone ; ALP Alkaline phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A neonate presented with clinical, biochemical, endocrine and radiographic features consistent with vitamin D deficiency rickets of maternal origin. Persistent hypocalcemia and subsequent development of pancytopenia, hemolysis and hepatosplenomegaly prompted further studies that led to the diagnosis of infantile osteopetrosis. Conclusion Osteopetrosis is an important differential diagnosis of neonatal rickets and is not excluded by low vitamin D levels.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Chronische myeloproliferative Erkrankungen ; Prognose ; Knochenmarkmorphologie ; Klinische Befunde ; Key words Chronic myeloproliferative disorders ; Survival ; Bone marrow morphology ; Clinical findings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The broad spectrum of clinical and hematological as well as histomorphological findings at diagnosis of chronic myeloproliferative disorders (CMPDs) is significantly associated with prognosis. However, in this context the impact of bone marrow histology is still being controversially discussed. This feature applies to CML in particular. Therefore, risk classification is mainly based on clinical data. In order to evaluate the predictive value of bone marrow morphology we performed a retrospective study on a total of 1023 patients with CMPDs. Relative survival rates and a disease-specific loss of life expectancy were calculated to adjust the age- and gender-specific mortality in older patients. Patients with chronic myeloid leukemia (CML) showed an average life expectancy of 5 years, with significantly longer survival times under interferon treatment. In contrast, the ET group did not disclose any relevant reduction in life expectancy. Initial bone marrow fibrosis and a reduction in erythropoiesis were the most important prognostic features in CML. Furthermore, Pseudo-Gaucher cells indicated a favorable outcome in the cohort of patients receiving chemotherapy. On the other hand, peripheral myelo- and erythroblasts were correlated with a worsening in survival. Regarding IMF, a simplified multivariate risk score was constructed, including age, hemoglobin level, platelet and leukocyte counts, and a leuko-erythroblastic blood picture as most important variables. The three risk groups derived showed significantly different survival patterns, but in this calculation bone marrow histology exerted no major influence on survival. On the other hand, initial (prefibrotic) stages of IMF revealed a better prognosis. In conclusion, our results underline the importance of bone marrow morphology in CMPDs, since significant correlations with patients’ outcome were calculated. Particularly in CML, myelofibrosis and reduction of erythropoiesis were associated with survival and, thus, must be regarded as important predictive and independent parameters.
    Notes: Zusammenfassung Die große Variabilität der klinisch-hämatologischen sowie histologischen Befunde bei Diagnose der chronischen myeloproliferativen Erkrankungen (CMPE) spiegelt sich auch in den signifikant unterschiedlichen Überlebenszeiten der einzelnen Subtypen wider. Der Stellenwert der Knochenmarkhistologie ist im Rahmen prognostischer Untersuchungen teilweise immer noch umstritten, so daß insbesondere bei der CML schwerpunktmäßig nur klinische Parameter zur Risikoabschätzung herangezogen werden. Im Rahmen einer retrospektiven Analyse an insgesamt 1023 Patienten mit CMPE haben wir deshalb versucht, die Wertigkeit der Knochenmarkmorphologie in dieser Hinsicht abzuklären. Weiterhin wurden relative Überlebensraten und ein krankheitsspezifisches Lebenserwartungsdefizit berechnet, welche das alters- und geschlechtsspezifische Sterberisiko insbesondere der alten Patienten berücksichtigen. Die CML zeigte mit einer durchschnittlichen Lebenserwartung von unter 5 Jahren die schlechteste Prognose, wobei Patienten unter Interferon-Therapie signifikant längere Überlebenszeiten erkennen ließen. Demgegenüber fand sich bei der ET keine signifikante Verkürzung der natürlichen Lebenserwartung. Eine bereits geringe Vermehrung der Faserdichte im Knochenmark sowie eine reduzierte Erythropoese waren bei der CML die wesentlichen prognostischen Einflußgrößen. Zusätzlich deuteten Pseudo-Gaucher-Zellen bei Patienten unter Chemotherapie auf einen günstigeren Verlauf hin. Als weiterer hämatologischer Parameter hatte auf der anderen Seite die Anzahl peripherer Myelo- und Erythroblasten einen negativen Einfluß auf die Prognose. Bei der IMF konnten anhand eines vereinfachten multivariaten Prognosemodells drei Risikogruppen abgegrenzt werden, welche signifikant unterschiedliche Überlebenszeiten aufwiesen. Die Histologie des Knochenmarkes übte keinen entscheidenden Einfluß aus, auch wenn Patienten mit initialen (präfibrotischen) Stadien der Erkrankung einen leichten Überlebensvorteil zeigten. Alter bei Diagnose, Grad der Anämie, Thrombozytopenie, Leukozytose sowie ein leuko-erythroblastisches Blutbild waren hier die bedeutenden Variablen. Unsere Ergebnisse untermauern den Stellenwert der Knochenmarkmorphologie bei den CMPE, wobei sich signifikante Beziehungen zur Lebenserwartung der betroffenen Patienten ableiten lassen. Insbesondere bei der CML stellen die Verfaserung und die Reduktion der Erythropoese bei Diagnose unabhängige Prognoseparameter dar, welche bessere Erkenntnisse über den Verlauf erlauben.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 16 (1995), S. 328-335 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Bronchus-assoziiertes lymphatisches Gewebe ; Marginalzonen ; B-Zell-Lymphome ; Reaktive Keimzentren ; Follikelkolonisation ; Lymphoepitheliale Läsionen ; Key words Bronchus-associated lymphoid tissue ; Marginalzone B-cell lymphoma ; Reactive germinal centers ; Follicular colonisation ; Lymphoepithelial lesions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The malignant B-cell lymphoma of the MALT-type shows significant differences from nodal lymphomas with respect to its biological, molecular genetic, and clinical properties. According to the proposal from the International Lymphoma Study Group for a Revised European-American Classification of Lymphoid Neoplasms, MALT-B-cell lymphomas have been defined as an extranodal subgroup of marginal zone B-cell lymphomas and may have lower and higher grade types. We have applied this classification to 24 cases of primary B-cell lymphomas of the lung. These tumors showed histopathologic features of low (n = 20) and/or high grade neoplasms (n = 4) recapitulating the structure of the acquired bronchus- associated lymphoid tissue (BALT). According to our experience, the diagnosis of BALT-type B-cell lymphoma, is both practically feasable and reproducible not only for surgical material but even for biopsy specimens.
    Notes: Zusammenfassung Maligne B-Zell-Lymphome vom MALT-Typ unterscheiden sich signifikant von nodalen Lymphomen bzgl. ihrer biologischen, molekulargenetischen und klinischen Eigenschaften. Nach den Vorschlägen der Internationalen Lymphom-Studiengruppe für eine revidierte europäisch-amerikanische Klassifikation lymphatischer Neoplasien sind MALT-B-Zell-Lymphome als extranodale Form von Marginalzonen-B-Zell-Lymphomen definiert, die einen niedrigeren oder höheren Malignitätsgrad aufweisen können. Wir wandten dieses Klassifikationskonzept auf 24 Fälle primärer pulmonaler B-Zell-Lymphome an. Alle Fälle zeigten histologische Merkmale niedrigmaligner (n = 20) und/oder hochmaligner Neoplasien (n = 4), die die Struktur des erworbenen bronchusassoziierten lymphatischen Gewebes (BALT) rekapitulierten. Nach unserer Erfahrung, ist die Diagnose von B-Zell-Lymphomen des BALT-Typs nicht allein an chirurgischen Resektaten, sondern auch an Biopsien in der praktischen Diagnostik möglich und reproduzierbar.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 225 (1979), S. 257-264 
    ISSN: 1434-4726
    Keywords: Extramedullary plasmacytomas ; Intracytoplasmic monoclonal immunoglobulins ; Choice of treatment ; Prognosis ; Extramedulläre Plasmocytome ; Intracytoplasmische monoclonale Immunglobuline ; Behandlungsmethode ; Prognose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zwei Beobachtungen eines solitären extramedullären Plasmocytoms des Epipharynx bzw. der Zunge werden vorgestellt, bei denen trotz fehlender Paraproteinsekretion intracytoplasmatisch ein monoklonales Immunglobulin vom Typ Ig G, Kappa, immunhistochemisch nachgewiesen werden konnte. Nach chirurgischer Exstirpation im Gesunden sind beide Patienten nach einem Beobachtungszeitraum von 12 bzw. 14 Monaten rezidivfrei. Bei regelmäßiger Kontrolle scheint die Prognose des solitären extramedullären Plasmocytoms nach chirurgischer oder kombinierter chirurgisch-radiologischer Therapie günstig zu sein.
    Notes: Summary Two cases of solitary extramedullary plasmacytoma, one of the nasopharynx and one of the tongue are reported. Although there was no paraprotein secretion present, we were able to demonstrate an intracytoplasmic monoclonal immunoglobulin (type IgG-kappa) by immunohistochemical methods. Twelve months following surgical treatment both patients locally and by serum controls are free of residual disease. We confirm former studies in the literature that the prognosis of solitary extramedullary plasmacytomas seems to be good after surgical or radiation therapy. Continuous individual follow-up including serum and X-ray controls are obligatory.
    Type of Medium: Electronic Resource
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