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1989 ; 80
(4
): 360-5
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Microvascular changes in the stroma of human colorectal carcinomas:
ultrastructural histochemical study
#MMPMID2501252
Ohtani H
; Sasano N
Jpn J Cancer Res
1989[Apr]; 80
(4
): 360-5
PMID2501252
show ga
Ultrastructural histochemical studies were performed using Ulex europaeus
agglutinin-I lectin (UEA-I) and anti-endothelial monoclonal antibody BMA 120 in
order to morphologically characterize the microvasculature of human colorectal
carcinomas. In the normal mucosa, UEA-I and BMA 120 were bound to luminal plasma
membrane of endothelial cells, usually continuously. Capillaries in the stroma of
invasive adenocarcinomas showed remarkable structural changes such as swelling of
endothelial cells with well-developed cell organelles and narrowing of the lumen.
Reaction products for UEA-I and BMA 120 were both observed along the luminal
plasma membrane of endothelial cells, usually discontinuously, partially
retaining the features of normal capillaries. Furthermore, we have confirmed an
occurrence of solid capillary buds composed of a strand of large endothelial
cells with a trace of lumen. They showed almost no reactivity to UEA-I and BMA
120. Conventional electron microscopy revealed that they were present frequently
in invasive carcinomas, but infrequently in intramucosal carcinomas and
inflammatory lesions. Our results suggest that the stroma of invasive colorectal
carcinomas abounds in immature capillaries and their precursors, which may
indicate active tumor-induced angiogenesis.