{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T15:16:41Z","timestamp":1778771801532,"version":"3.51.4"},"reference-count":45,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2022,3,17]],"date-time":"2022-03-17T00:00:00Z","timestamp":1647475200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Vet Comparative Oncology"],"published-print":{"date-parts":[[2022,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Canine histiocytic proliferative disorders include aggressive and fatal diseases, such as histiocytic sarcoma (HS) and histiocytosis (SyH). The molecular mechanisms underlying cell proliferation need to be elucidated for the development of effective treatments. In the present study, mRNA expression levels were comprehensively analysed in cell lines derived from localized HS, disseminated HS, SyH and Langerhans cell histiocytosis (LCH) in dogs. Based on the results obtained, the growth inhibitory effects of palbociclib, a CDK4\/6 inhibitor, were verified with the cell lines in vitro and in xenograft mouse model. Hierarchical clustering and principal component analysis plots of mRNA expression profiles divided the cell lines into three groups: a localized HS group, disseminated HS\/SyH group, and LCH. The results of an ingenuity pathway analysis suggested that the MAPK signalling pathway was activated in the localized HS and LCH cell lines, and the PI3K signalling pathway in the disseminated and localized HS cell lines. In all cell lines, the expression of the tumour suppressor genes <jats:italic>TP53<\/jats:italic>, <jats:italic>CDKN2A<\/jats:italic> and <jats:italic>CDKN1A<\/jats:italic> was down\u2010regulated, whereas that of Rb was preserved. In vitro assessments revealed the growth inhibitory effects of palbociclib in all cell lines examined. In a xenograft mouse model using a cell line from disseminated HS, palbociclib exerted significant growth inhibitory effects. These results suggest the potential of palbociclib as a therapeutic drug candidate for the treatment of malignant histiocytic proliferative disorders of the dog.<\/jats:p>","DOI":"10.1111\/vco.12812","type":"journal-article","created":{"date-parts":[[2022,3,12]],"date-time":"2022-03-12T11:08:43Z","timestamp":1647083323000},"page":"587-601","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["<scp>mRNA<\/scp> sequencing analysis and growth inhibitory effects of palbociclib on cell lines from canine histiocytic proliferative disorders"],"prefix":"10.1111","volume":"20","author":[{"given":"Miyuki","family":"Hirabayashi","sequence":"first","affiliation":[{"name":"Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences The University of Tokyo  Tokyo Japan"},{"name":"Saitama Animal Medical Center  Saitama Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James 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