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Ultrastruct Pathol. 2016 Sep-Oct;40(5):231-9. doi: 10.1080/01913123.2016.1174908. Epub 2016 May 10.

Modes of internalizations of human prostate carcinoma (DU145) cells in vitro and in murine xenotransplants.

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a Department of Anatomical Sciences , St. George's University International School of Medicine, K. B. Taylor Global Scholar's Program at Northumbria University , Newcastle upon Tyne , UK.
b Unité de Recherche en Physiologie Moléculaire (URPhyM) et Laboratoire des Cellules et Tissus, Faculté de Médecine , Université de Namur , Namur , Belgium.
c The Apatone Development Center, St. Thomas Hospital, Summa Research Foundation , Akron , OH , USA.


Ultrastructural data compiled from DU145 human prostate carcinoma cells growing in vivo and, more often in vitro or after treatment by pro-oxidant reactants, can induce and encompass several processes of cell internalization or entosis. These events were observed after tumor cells were essentially undergoing autoschizic injuries and other cell deaths without externalization of phosphatidylserine. Based on other previous observations made on DU145 cells, one hypothesizes that, as a means of survival, tumor cells find sources of nutrients through phagocytosis of apparently intact, injured cells, corpses, and cell debris by cannibalism. These peculiar activities occurred sporadically, in a small population of cells and could be dictated by their widely adapted energetic metabolism, now impaired, either due to the location of the cells in the growing tumors or in vitro as a result of this pro-oxidant anticancer treatment causing damage and abolishing their adapted metabolism.


Autoschizis; cannibalism; cell death; cytophagosome; entosis; human prostatic carcinoma

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