The breast tumors that are most difficult to eradicate with chemotherapy have wild-type and preferentially enter senescence after treatment. One factor contributing to the persistence of senescent cells in residual disease: acquisition of a novel phenotype that allows cannibalism of entire cells and engulfment of other substrates.
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http://dx.doi.org/10.1080/23723556.2019.1688601 | DOI Listing |
Free Neuropathol
January 2024
UC Irvine School of Medicine, Department of Pathology and Laboratory Medicine, University of California, 101 The City Drive South, Orange, CA 92868, USA.
We describe a case of a young patient with a recurrent pleomorphic xanthoastrocytoma (PXA) showing unusual cell-in-cell (CiC) phenomena. We observed mostly viable but also necrotic neutrophils engulfed within tumor cells. The recurrent tumor was immunopositive for BRAFV600E mutant protein and showed CDKN2 homozygous deletions typical of PXA.
View Article and Find Full Text PDFCell Death Discov
March 2024
Cancer Research Institute "Tomsk National Research Medical Centre of the Russian Academy of Sciences", Kooperativniy Lane, 5, 634009, Tomsk, Russia.
To date, numerous mechanisms have been identified in which one cell engulfs another, resulting in the creation of 'cell-in-cell' (CIC) structures, which subsequently cause cell death. One of the mechanisms of formation of these structures is entosis, which is presumably associated with possible carcinogenesis and tumour progression. The peculiarity of the process is that entotic cells themselves actively invade the host cell, and afterwards have several possible variants of fate.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
December 2023
Molecular Cellular and Developmental Biology Department, University of California, Santa Barbara, CA 93106.
The 21kD GTPase Rac is an evolutionarily ancient regulator of cell shape and behavior. Rac2 is predominantly expressed in hematopoietic cells where it is essential for survival and motility. The hyperactivating mutation Rac2 also causes human immunodeficiency, although the mechanism remains unexplained.
View Article and Find Full Text PDFJ Comp Pathol
November 2023
Animal Medical Center Peco, 3-60-7 Sendagaya, Shibuya-ku, Tokyo 151-0051, Japan.
A 6-years and 6-months-old, neutered male mongrel dog had a skin mass between the left eye and nose. Fine needle aspiration biopsy of the mass revealed giant epithelial cells containing many neutrophils in the cytoplasm. The mass was excised and histopathologically diagnosed as an infundibular cyst with giant epithelial-like cells containing neutrophils in part of the lumen.
View Article and Find Full Text PDFJ Cell Biol
November 2023
Molecular, Cellular, and Developmental Biology Department, University of California, Santa Barbara, Santa Barbara, CA, USA.
Src family kinases (SFKs) are evolutionarily conserved proteins acting downstream of receptors and regulating cellular processes including proliferation, adhesion, and migration. Elevated SFK expression and activity correlate with progression of a variety of cancers. Here, using the Drosophila melanogaster border cells as a model, we report that localized activation of a Src kinase promotes an unusual behavior: engulfment of one cell by another.
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