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  • 1990-1994  (2)
  • Cardiac renin-angiotensin system  (1)
  • Gastric carcinoma  (1)
  • 1
    ISSN: 1432-1440
    Keywords: Myocardial fibrosis ; Arterial hypertension ; Cardiac renin-angiotensin system ; ACE inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The interstitial space of the myocardium is composed of nonmyocyte cells and a highly organized collagen network which serves to maintain the architecture and mechanical behavior of the myocardial walls. It is the myocardial collagen matrix that determines myocardial stiffness in the normal and structurally remodeled myocardium. In hypertensive heart disease, the heterogeneity in myocardial structure, created by the altered behavior of nonmyocyte cells, particularly cardiac fibroblasts which are responsible for collagen synthesis and degradation, explains the appearance of diastolic and/or systolic dysfunction of the left ventricle that leads to symptomatic heart failure. Several lines of evidence suggest that circulating and myocardial renin-angiotensin systems (RAS) are involved in the regulation of the structural remodeling of the nonmyocyte compartment, including the cardioprotective effects of angiotensin converting enzyme (ACE) inhibition that was found to prevent myocardial fibrosis in the rat with renovascular hypertension. In cultured adult rat cardiac fibroblasts angiotensin II was shown to directly stimulate collagen synthesis and to inhibit collagenase activity, which is the key enzyme for collagen degradation, that would lead to collagen accumulation. In the spontaneously hypertensive rat, an appropriate experimental model for primary hypertension in man, left ventricular hypertrophy could be regressed and abnormal myocardial diastolic stiffness due to interstitial fibrosis could be restored to normal by inhibition of the myocardial RAS. These antifibrotic or cardioreparative effects of ACE inhibition that occurred irrespective of blood pressure normalization may be valuable in reversing left ventricular diastolic dysfunction in hypertensive heart disease.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-2451
    Keywords: Gastric carcinoma ; Keratin ; Villin ; Brush border hydrolases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Siebzehn Magenkarzinome (intestinal n=12; diffus n=1; Mischtyp n=4) und ein BarrettKarzinom wurden prospektiv hinsichtlich der Expression verschiedener Keratinpolypeptide sowie der Bürsten-saummarker Villin, Sucrase Isomaltase and Aminopeptidase N immunfluoreszenzmikroskopisch untersucht. Unabhängig vom histologischen Typ exprimierten alle Karzinome die Keratinpolypeptide 8, 18 and 19 and reagierten mit dem breit spezifischen Keratinantikbrper KL1. Das Keratin 7 hingegen wurde nur in einem Karzinom von nahezu allen Tumorzellen and bei zwei weiteren Karzinomen nur von einigen Tumorzellen exprimiert. Die weitergehende Differenzierung der verschiedenen hi stologischen Typen des Magenkarzinoms ist mit Hilfe der Keratinantikörper nicht m6glich. Villin war in 80% aller Karzinome and Sucrase Isomaltase and Aminopeptidase N waren in je 67%, wiederum ohne histologiespezifische Unterschiede, positiv. Die Nachweisbarkeit der Bürstensaummarker, charakteristisches Kennzeichen des intestinalen Epithels, verdeutlicht das hohe Maß der intestinalen Differenzierung der Magenkarzinome, ohne daß eine Zuordnung zu bestimmten histologischen Typen möglich erscheint.[/p]
    Notes: Summary Seventeen gastric carcinomas (intestinal n=12; diffuse n=1; mixed type n=4) and one Barrett's carcinoma were prospectively studied by immunohistochemistry for the expression of different keratin polypeptides and of the brush border markers villin, sucrase isomaltase and aminopeptidase N. All carcinomas expressed the keratin polypeptides 8, 18, and 19 and were stained by the broad specific keratin antibody KL1, irrespective of histologic type. Keratin 7, however, was expressed in only one carcinoma in most tumor cells and in two further carcinomas in some tumor cells. Thus, specific differentiation of the various histologic types of gastric carcinoma does not seem to be aided by the use of keratin antibodies. Villin was positive in 80% of the tumors and sucrase isomaltase and aminopeptidase N were positive in 67% respectively with no obvious histologic difference. The frequent positivity of the brush border markers, usually typical for intestinal epithelium, reflects the high degree of intestinal differentiation of gastric carcinomas, but again does not seem to be associated with a particular histologic type.[/p]
    Type of Medium: Electronic Resource
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