title: Immunohistochemical study of phospho-Stat3-ser727 expression in feline mammary gland tumours.
abstract: We describe the expression of pStat3-ser727 (signal transducer and activator of transcription 3 phosphorylated on serine 727) in normal, hyperplastic and neoplastic feline mammary gland tissue assessed by immunohistochemistry in 56 cats. The samples included 4 normal mammary non-lactating tissues, 13 hyperplastic lesions (9 lobular and 4 fibroepithelial) and 39 tumours (6 benign and 33 carcinomas). For immunohistochemistry, tissue sections were incubated with anti-pStat3-ser727 monoclonal antibodies and visualized with EnVision-DAB polymer. pStat3-ser727 positivity was quantified in a semi-quantitative manner, differentiating cytoplasmic and nuclear localization. Intense anti-pStat3-ser727 immunoreactivity was detected in epithelial neoplastic cells and in the fibro-component in two fibroepithelial hyperplastic lesions. The immunostaining was dot-like in the cytoplasm and homogeneous in the nuclei in both benign and malignant lesions. Statistically significant relations were observed between nuclear expression of pStat3-ser727 and the pleomorphism score (p = 0.006), mitotic activity (p < 0.0001), and histological grade (p < 0.0001). In contrast, no significant correlations were observed for cytoplasmic pStat3-ser727. These findings add new and interesting information on the potential role of the phosphorylated form of Stat3 in malignant lesions.
authors.affiliation: Department of Public Health, Comparative Pathology and Veterinary Hygiene School of Veterinary Medicine, University of Padua, Agripolis, Legnaro. claudio.petterino@unipd.it
authors.forename: C
authors.initials: C
authors.lastname: Petterino
authors.forename: G
authors.initials: G
authors.lastname: Podestà
authors.forename: A
authors.initials: A
authors.lastname: Ratto
authors.forename: M
authors.initials: M
authors.lastname: Drigo
authors.forename: C
authors.initials: C
authors.lastname: Pellegrino
mesh_terms: D000818:Animals; D002277:Carcinoma / Q000378:metabolism / Q000473:pathology / Q000662:veterinary*; D002371:Cat Diseases / Q000378:metabolism* / Q000473:pathology; D002415:Cats; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D015674:Mammary Neoplasms, Animal / Q000378:metabolism* / Q000473:pathology; D010766:Phosphorylation; D050796:STAT3 Transcription Factor / Q000096:biosynthesis* / Q000378:metabolism; D012694:Serine / Q000378:metabolism; D018709:Statistics, Nonparametric
chemical_list: D050796:STAT3 Transcription Factor; D012694:Serine