Immunohistochemical expression of caveolin-1 in normal and neoplastic canine mammary tissue.
Caveolins are the major structural proteins of caveolae and play a role in tumour surveillance. The expression of caveolin-1 (Cav-1) was investigated immunohistochemically in samples of normal canine mammary tissue (n=5), benign (n=23) and malignant (n=45) mammary tumours, tumour emboli (n=10) and metastatic lesions (n=10). Cav-1 was not expressed by normal luminal epithelium, but was consistently expressed by normal myoepithelial cells. There was no epithelial expression of Cav-1 by the benign mammary lesions, but the molecule was detected in 35.6% of the malignant lesions, 80% of the tumour emboli and in 40% of the metastatic lesions. These findings link increased expression of Cav-1 to neoplastic transformation and suggest that Cav-1 expression is associated with more malignant canine mammary tumours and their vascular invasion and regional lymph node metastasis.
Amorim
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I
ICBAS-UP, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Largo Prof. Abel Salazar, 2, 4099-003 Porto, Portugal.
Lopes
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Faustino
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AM
Pereira
P Dias
PD
D000236:Adenoma / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D000818:Animals; D002277:Carcinoma / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D051242:Caveolin 1 / Q000378:metabolism*; D002471:Cell Transformation, Neoplastic / Q000378:metabolism* / Q000473:pathology; D004283:Dog Diseases / Q000378:metabolism* / Q000473:pathology; D004285:Dogs; D005260:Female; D007150:Immunohistochemistry; D008321:Mammary Glands, Animal / Q000378:metabolism / Q000473:pathology; D015674:Mammary Neoplasms, Animal / Q000378:metabolism* / Q000473:pathology; D009360:Neoplastic Cells, Circulating / Q000378:metabolism / Q000473:pathology
D051242:Caveolin 1