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Angiogenesis and Interstitial Pressure in a Rat Tumour Model

Identifieur interne : 000B41 ( Istex/Corpus ); précédent : 000B40; suivant : 000B42

Angiogenesis and Interstitial Pressure in a Rat Tumour Model

Auteurs : H. Hünigen ; R. Drees ; J. Schnorr ; J. Plendl

Source :

RBID : ISTEX:184E14EF6464C224D40B3EB5FB7605B82F6A1BA2

Abstract

Introduction and Aim:  Angiogenesis, the formation of new blood vessels, is a crucial process in physiological and pathological growth. Pathological angiogenesis is responsible for growth and metastasis of solid tumours, and, when blocked, improves prognosis. As a result of the angiogenic cascade in solid tumours an irregular, leaky capillary network develops. The aim of the present study was to define malignant tumours’ vascular characteristics and reveal functional anatomy by quantification of the microvasculature and interstitial pressure (IP) in relation to tumour fluid dynamics as visualized by contrast enhanced magnetic resonance imaging (MRI).

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DOI: 10.1111/j.1439-0264.2005.00669_48.x

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ISTEX:184E14EF6464C224D40B3EB5FB7605B82F6A1BA2

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<b>Introduction and Aim: </b>
Angiogenesis, the formation of new blood vessels, is a crucial process in physiological and pathological growth. Pathological angiogenesis is responsible for growth and metastasis of solid tumours, and, when blocked, improves prognosis. As a result of the angiogenic cascade in solid tumours an irregular, leaky capillary network develops. The aim of the present study was to define malignant tumours’ vascular characteristics and reveal functional anatomy by quantification of the microvasculature and interstitial pressure (IP) in relation to tumour fluid dynamics as visualized by contrast enhanced magnetic resonance imaging (MRI).</p>
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Histology, immunohistochemistry and MRI confirmed concentric arrangement of 4 tumour zones. The tumour margin included loose connective tissue with abundant mononuclear cells. Many large microvessels were seen in this most intensely vascularized zone. IP measurement in this zone was adjusted to the zero level. Diameter of the peripheral zone of vital cells measured 1.3 mm. Capillaries were smaller and sparse. Dynamic MRI revealed peripheral washout of the contrast agent in this zone. After an initial increase of the signal intensity a hypo‐intense rim was formed within a few minutes. The intermediate region was characterized by islands of vital tumour cells containing 3% capillaries (hot spots). The innermost area, the necrotic zone, took 35% of the total tumour area with less than 0.5% vessels. The IP increased from the periphery to the centre. VEGF and VEGF‐receptor 2 was found in the vessels of the tumour margin and vital tumour cells of the peripheral zone. From this can be concluded that the peripheral washout phenomenon seems to be correlated with elevated interstitial pressure and increased capillary density and therefore may be a reliable sign of malignancy.</p>
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<title>Anatomia, Histologia, Embryologia</title>
</titleInfo>
<genre type="journal">journal</genre>
<identifier type="ISSN">0340-2096</identifier>
<identifier type="eISSN">1439-0264</identifier>
<identifier type="DOI">10.1111/(ISSN)1439-0264</identifier>
<identifier type="PublisherID">AHE</identifier>
<part>
<date>2005</date>
<detail type="volume">
<caption>vol.</caption>
<number>34</number>
</detail>
<detail type="supplement">
<caption>Suppl. no.</caption>
<number>s1</number>
</detail>
<extent unit="pages">
<start>22</start>
<end>22</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">184E14EF6464C224D40B3EB5FB7605B82F6A1BA2</identifier>
<identifier type="DOI">10.1111/j.1439-0264.2005.00669_48.x</identifier>
<identifier type="ArticleID">AHE669_48_48</identifier>
<recordInfo>
<recordContentSource>WILEY</recordContentSource>
<recordOrigin>Blackwell Verlag GmbH</recordOrigin>
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