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  • 1
    ISSN: 1432-0584
    Keywords: Kinetik der Granulozyten ; Kinetic of granulocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Two hematologically normal patients with glioblastoma and six patients with chronic lymphocytic leukemia received continuous3H-thymidine infusions for 3–10 days. In autoradiographs of blood cell smears taken for 25 days or more after the beginning of3H-thymidine administration the labeling index and the labeling intensity of granulocytes were determined. A sufficiently high labeling intensity, i. e. a sufficiently long autoradiographic exposure time was found to be critical for obtaining valid and reproducible results. On the basis of certain assumptions discussed in detail, complete labeling of cells with3H-thymidine followed by autoradiographic evaluation and mathematical analysis of the labeling patterns seems to be a suitable method for estimation of kinetic parameters of postmitotic granulocytes in vivo. The mean intramedullary maturation and storage time was observed to be 115 ± 7 h for neutrophils, 103 ± 4 h for eosinophils and 103 ± 11 h for basophils. The mean relative inflow rate into the blood (or relative turnover rate in the blood) was found to be 4.2 ± 0.4 %/h for neutrophils, 4.0 ± 0.4 %/h for eosinophils and 1.2 ± 0.3 %/h for basophils. The mean blood transit time (or blood sojourn time) was estimated to be 25 ± 2 h for neutrophils, 26 ± 3 h for eosinophils and 89 ± 21 h for basophils. Accordingly the half lifes (T 1/2) of granulocytes in the blood were 17.3 ± 1.4 h for neutrophils, 18.0 ± 2.1 foi eosinophils and 62 ± 15 h for basophils. Under the quasi steady state conditions of this study the kinetics of granulocytes in the present CLL patients appeared to be normal, despite a marked lymphocytic infiltration of the bone marrow. The apparent discrepancy between these findings and the data obtained with autotransfusion of DFP-labeled granulocytes is discussed.
    Notes: Zusammenfassung Zwei hämatologisch normale Patienten mit Glioblastoma multiforme und sechs Patienten mit chronischer lymphatischer Leukämie (CLL) erhielten3H-Thymidin-Infusionen von 3 bis 10 Tagen Dauer. In autoradiographierten Blutausstrichen wurden der Markierungsindex und die Markierungsintensität der Granulozyten bestimmt. Um optimale Markierungsverhältnisse zu erreichen, waren sehr lange autoradiographische Expositionszeiten erforderlich. Die mathematische Analyse der Markierungsindex-Kurven ermöglichte die Schätzung folgender kinetischer Parameter der postmitotischen Granulozyten: mittlere Reifungs- und Speicherungszeit im Knochenmark (115 ± 7 Std. für Neutrophile, 103 ± 4 Std. für Eosinophile und 103 ± 11 Std. für Basophile); mittlere relative Einstromrate ins Blut (4,2 ± 0,4%/Std. für Neutrophile, 4,0 ± 0,4%/Std. für Eosinophile und 1,2 ± 0,3%/Std. für Basophile); mittlere Blut-Transitzeit (25 ± 2 Std. für Neutrophile, 26 ± 3 Std. für Eosinophile und 89 ± 21 Std. für Basophile); mittlere Halbwertzeit im Blut (17,3 ± 1,4 Std. für Neutrophile, 18,0 ± 2,1 Std. für Eosinophile und 62 ± 15 Std. für Basophile). Unter den vorliegenden Bedingungen schien die Kinetik der Granulozyten bei den untersuchten CLL-Patienten trotz erheblicher lymphozytärer Infiltration des Knochenmarks normal zu sein. Der auffällige Unterschied der Bluthalbwertszeit für Neutrophile in dieser Studie und den früher publiziertem Werte aufgrund von Autotransfusionen DFP-markierter Granulozyten wird diskutiert.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 174 (1979), S. 205-208 
    ISSN: 1433-8580
    Keywords: Lymph nodes ; Lymphocyte production ; Lymphocyte migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In normal young pigs two labeling procedures were evaluated to study the production of lymphocytes in mesenteric lymph nodes. Tritiated thymidine was injected either into the superior mesenteric artery or directly into the lymph nodes. There was a high rate of lymphocyte production and a considerable export of newly-formed small lymphocytes. The distribution to lymphoid organs and the appearance of labeled lymphocytes in the blood were comparable after both techniques. The intranodal labeling resulted in a more selective labeling and thus was found to be the superior method for quantitative studies.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 165 (1976), S. 227-237 
    ISSN: 1432-0878
    Keywords: Spleen-lymphocytes ; Cell division ; In vitro-in vivo studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Parameters of the cell cycle of lymphoid cells were estimated by analyzing percent labeled mitoses curves after a 3H-thymidine flash. Either anaesthetized pigs were labeled and multiple biopsies taken from the spleen in vivo or isolated perfused pig spleens were labeled in vitro. The data from in vivo and in vitro experiments were very similar. The mean values for cell cycle parameters were: 20.2 to 20.5 hours for the generation time, about 0.5 to 1 hour for G2, about 1.2 to 1.3 hours for M; about 17 to 16.5 hours for S and about 1.5 to 1.7 hours for G1. The mean grain count halving time of labeled mitoses was in accordance with the measured generation time. The isolated perfused spleen seems to give results equal to in vivo data and could, therefore, be employed as a model for studying cell cycle parameters not only in animal but also in human lymphoid tissue.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Lymphocyte production by mesenteric lymph nodes of normal young pigs was studied by intranodal injections of either tritiated thymidine or tritiated deoxycytidine as DNA precursors. One or two days after selective labeling of the mesenteric lymph nodes the relative and absolute number of lymphocytes derived from mesenteric lymph nodes were determined autoradiographically in the following organs: mesenteric, cervical and inguinal lymph nodes, spleen, thymus, bone marrow, peyer'spatches, tonsil, different regions of the gut, lung and liver. The overall cell production of mesenteric lymph nodes, as derived from the sum of all labeled cells one day after labeling, was estimated to be about 7 × 109 lymphocytes. Up to 40% of all newly formed lymphocytes had already left the lymph nodes within one day and were found in all organs studied. There was a preferential homing to the mucosa of the small intestine, but a considerable number migratedto the spleen and even to the thymus and bone marrow. In lymphoid organs all labeled cells were small and medium-sized lymphocytes one and two days after labeling. In cervical lymph nodes, spleen, tonsil and peyer's patches the relative distribution to T and B cell areas was determined. There was an obvious preference of newly formed lymph node cells to home to T cell areas. The differences of labeling between thymidine or deoxycytidine were surprisingly low.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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