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  • Cardiac sarcolemma  (1)
  • Reendothelialization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 334 (1986), S. 56-62 
    ISSN: 1432-1912
    Keywords: β-Adrenoceptor antagonists ; β-Adrenoceptor subtypes ; Cardiac sarcolemma ; Cardiomyocytes ; Coronary endothelial cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In mammalian heart tissue β2 are known to coexist with β1. In the present study, evidence that β2 in guinea-pig and rat ventricles are primarily localized on the coronary endothelium is provided by competition binding studies with the subtype-selective β-adrenoceptor antagonists ICI 89.406 (β1) and ICI 118.551 (β2) on four different plasma membrane preparations. (1) Following density gradient centrifugation of cardiac ventricular microsomes from rats or guinea-pigs, endothelial plasma membranes migrated at slightly higher density than the sarcolemmal membranes, as verified by endothelial (angiotensin converting enzyme) and sarcolemmal markers (adenylate cyclase, [3H] ouabain binding). At the activity peak of angiotensin converting enzyme, the relative amount of β2 in guinea-pigs and rats was 25% and 65%, respectively. (2) On sarcolemmal membranes corresponding to the activity peak of adenylate, cyclase, β-adrenoceptors consisted of the β1 exclusively (guinea-pig), or to at least 90% (rat). (3) Cultures of coronary endothelial cells derived from guinea-pigs revealed only β2. (4) Isolated guinea-pig cardiomyocytes contained only β1, a finding recently established in rat myocytes as well.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 366 (1985), S. 708-708 
    ISSN: 1435-2451
    Keywords: Endothelial layer ; Ecto-ADPase ; Adenosine ; Reendothelialization ; Venöses Endothel ; Ekto-ADPase ; Adenosin ; Reendothelialisierung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Endothel eines isoliert perfundierten Venensegmentes (V. cava inferior des Hasen) baut intravasal appliziertes 5′ Adenosindiphosphat (ADP) schnell zu antithrombogenen Adenosin ab (2,3±0,2 nmol/minx 106 Zellen). Der ADP-Abbau durch Blutzellen ist vergleichsweise langsam (0,0007 ± 0,0002 nmol/min x 106 Zellen). Nach Schädigung des Endothels mit dem FogartyKatheter kann die verbleibende GefdBwand ADP zwar nahezu ebenso rasch abbauen, Plättchen inhibierendes Adenosin entsteht jedoch in geringeren Mengen. Dieser Befund normalisiert sich nach Reendothelialisierung.
    Notes: Summary In the isolated perfused vena cava inferior of the rabbit, platelet-aggregating ADP is rapidly degraded to platelet-inhibiting adenosine (2.3±0.2 nmol/minx 106 cells). In contrast ADP degradation by blood cells is relatively slow (0.0007 ± 0.0002 nmol/min x 106 cells). After damage of the endothelial layer by a Fogarty catheter, the ADP degradation activity of the vessel wall does not change; adenosine, however, acumulates in lower quantities. Reendothelialization of the vessel wall causes physiological adenosine production from ADP degradation.
    Type of Medium: Electronic Resource
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