View source for Entosis

{{Short description|Aspect of microbiology}}
'''Entosis''' (from [[Ancient Greek|Greek]] ἐντός ''entos'', "within" and -ωσις ''-osis'', "development process") is the invasion of a living cell into another cell's [[cytoplasm]].<ref name="Janssen 2011">{{cite journal|last=Janssen|first=Aniek|author2=Rene H. Medema|title=Entosis: aneuploidy by invasion|journal=Nature Cell Biology|date=1 March 2011|volume=13|issue=3|pages=199–201|doi=10.1038/ncb0311-199|pmid=21364569|s2cid=13198876}}</ref> The process was discovered by Overholtzer ''et al''. as reported in ''[[Cell (journal)|Cell]]''.<ref name="Overholtzer 2007">{{cite journal|last=Overholtzer|first=Michael|author2=Arnaud A. Mailleux |author3=Ghassan Mouneimne |author4=Guillaume Normand |author5=Stuart J. Schnitt |author6=Randall W. King |author7=Edmund S. Cibas |author8=Joan S. Brugge |title=A Nonapoptotic Cell Death Process, Entosis, that Occurs by Cell-in-Cell Invasion|journal=Cell|date=30 November 2007|volume=131|issue=5|pages=966–979|doi=10.1016/j.cell.2007.10.040 |pmid=18045538|s2cid=16074283|doi-access=free}}</ref>
Entotic cells, also referred to as cell-in-cell structures, are triggered by loss of attachment to the [[extracellular matrix]] (ECM). This internalization of one cell by another is dependent on [[adherens junction]]s, and is driven by a [[Rho family of GTPases|Rho]]-dependent process, involving [[actin]] [[polymerization]] and [[myosin]] II activity in the internalized cell.<ref name="Overholtzer 2007" /> Adherens junctions bind cells together by linking [[cadherin]] [[transmembrane protein]] complexes of adjacent cells to the cytoskeleton. When certain cell types are detached from the ECM and have lost adhesion, the compaction force between neighboring cells can cause them to push into their neighbors, forming the trademark cell-in-cell structures.<ref name="Memorial 2009" /> Though cell-in-cell structures commonly refer to the interaction between two neighboring cells, entosis has been observed involving more than two cells. In the case of an entotic structure formed between three cells, the middle cell acts as both an internalizing and an outer host cell simultaneously.<ref name="Memorial 2009">{{cite web|last=Overholtzer|first=Michael|title=An Interview with Michael Overholtzer|url=http://www.mskcc.org/research/lab/michael-overholtzer/interview-michael-overholtzer|publisher=Memorial Sloan-Kettering Cancer Center|access-date=14 April 2012}}</ref>
[[Aneuploidy]], a condition in which [[nondisjunction]] gives rise to [[gamete]]s with an abnormal number of [[chromosomes]],<ref name="Alberts 2010">{{cite book|last=Alberts|first=Bruce|title=Essential Cell Biology, 3rd Ed|year=2010|publisher=Garland Science, Taylor & Francis Group, LLC|location=New York, NY|isbn=978-0-8153-4129-1|pages=662–663}}</ref> is one of the most prevalent phenotypes of human tumors. The underlying cause of aneuploidy remains highly debated; however, entosis is shown to perturb [[cytokinesis]] (cytoplasmic division) and trigger the formation of aneuploid cells.<ref name="Janssen 2011" /> This would be in line with past research, as cell-in-cell structures have been widely observed in the focused study of many human tumors, including lung, breast, and endometrial stromal carcinomas.<ref name="Overholtzer 2007" />
A cell trapped by entosis is initially alive and can divide inside the cell that has enveloped it. On occasion, the entotic cell will be released by the host cell,<ref>{{Cite journal|last1=Nirmala|first1=J. Grace|last2=Lopus|first2=Manu|date=April 2020|title=Cell death mechanisms in eukaryotes|url=https://pubmed.ncbi.nlm.nih.gov/31820165|journal=Cell Biology and Toxicology|volume=36|issue=2|pages=145–164|doi=10.1007/s10565-019-09496-2|issn=1573-6822|pmid=31820165|s2cid=208869679}}</ref> but most internalized cells are eventually killed.<ref name="Memorial 2009" /> Normal cells can kill themselves via [[apoptosis]], which is followed by the programmed engulfment and [[phagocytosis|phagocytic]] ingestion of the cell's remain by another. Entosis differs greatly from apoptosis in that the entotic process exhibits behavior closely resembling cellular invasion rather than cellular engulfment.<ref name="Overholtzer 2007" />  Cancer cells adaptively avoid apoptosis, allowing them to live and multiply indefinitely, making it difficult to design drugs that effectively kill tumors. Therefore, entosis acts as a nonapoptotic cell death mechanism, and could possibly be a new way in which cancer cells can be killed.<ref name="Memorial 2009" />
== General mechanism ==
The mechanism of entotic cell cannibalism is a complex cell biology process. The process is initiated when epithelial cells form [[adherens junction]]s , this is followed by the generation of actomyosin-contractility. The combination of this processes drives cell engulfment by neighbor cell. After internalization, the inner cell is usually killed and digested by the outer cell. This process involves non-canonical autophagy, formation of lysosomes and nutrient recovery. In general,  entosis greatly depends on cytoskeletal structure changes and biophysical forces during  the creation of cell-in-cell structures . Novel degradation and signaling pathways are employed during the inner cell killing and digestion process.<ref name=DurganFlorey2018>{{cite journal |last1=Durgan |first1=J. |last2=Florey |first2=O. |title=Cancer cell cannibalism: Multiple triggers emerge for entosis |journal=Biochimica et Biophysica Acta (BBA) - Molecular Cell Research |date=June 2018 |volume=1865 |issue=6 |pages=831–841 |doi=10.1016/j.bbamcr.2018.03.004 |pmid=29548938 |doi-access=free }}</ref>
== Entosis in cancer ==
[[File:Entosis.jpg|thumb|390x390px|The triggers and consequences of entosis in cancer<ref>{{Cite journal|last1=Durgan|first1=Joanne|last2=Tseng|first2=Yun-Yu|last3=Hamann|first3=Jens C|last4=Domart|first4=Marie-Charlotte|last5=Collinson|first5=Lucy|last6=Hall|first6=Alan|last7=Overholtzer|first7=Michael|last8=Florey|first8=Oliver|date=2017-07-11|editor-last=Yap|editor-first=Alpha|title=Mitosis can drive cell cannibalism through entosis|journal=eLife|volume=6|pages=e27134|doi=10.7554/eLife.27134|pmid=28693721|issn=2050-084X|pmc=5505699 |doi-access=free }}</ref>]]
Entosis has been found to be a different mechanism for cancer cells to form cell-in-cell structures at tumor sites. The entosis process in cancer cells is mediated via E-cadherin and P-cadherin. Since cadherins usually create homolytic cell to cell junctions, it is believed that the process mainly occurs between homologous cells. After cell-cell adhesions are mediated, the engulfed cells promote their own uptake into the neighbor cell. Additionally, they promote the ingestion process through actin polymerization and myosin contraction. The invading cell (outer cell) actomysin contraction is regulated by controllers or cell tension such as [[RHOA|RhoA]], furthermore they accumulate actin and myosin at the cell cortex which generates the mechanical tension that generates the cell-in-cell invasion mechanism. The entosis mechanism can potentially have substantial energetic implication in cancer cells compared to other mechanisms of cell death and engulfment. A crucial part of the process is the active involvement of invading cells, which does not happen in other forms of cell engulfment. This allows the mechanism to selectively target living cells,  excluding dead cells or non-living material such as cell debris. After internalization, engulfed cells are killed by the host cell following the maturation of the entotic vacuole that encapsulates the entotic cell. The maturation of the entotic vacuole involves modification by autophagy pathway proteins, followed by lysosome fusion and inner cell dead and degradation inside the host cell. In this mechanism, autophagy pathway proteins play an important role by scavenging extracellular nutrients derived from the inner cell death. Internalized cells can also undergo alternative fates such as apoptosis or  unharmed escape from host cell. In clinical cancer specimens, evidence of DNA fragmentation has been found suggesting that non-apoptotic cell death may be a common fate for entotic cells in human cancers.<ref>{{cite journal |last1=Fais |first1=Stefano |last2=Overholtzer |first2=Michael |title=Cell-in-cell phenomena in cancer |journal=Nature Reviews Cancer |date=12 November 2018 |volume=18 |issue=12 |pages=758–766 |doi=10.1038/s41568-018-0073-9 |pmid=30420767 |s2cid=53280583 }}</ref> Entosis correlates with cancer worse prognosis in head and neck squamous cell carcinoma, anal carcinoma, lung adenocarcinoma, pancreatic ductal carcinoma, and some breast ductal carcinoma.<ref>{{cite journal |last1=Mlynarczuk-Bialy |first1=Izabela |last2=Dziuba |first2=Ireneusz |last3=Sarnecka |first3=Agnieszka |last4=Platos |first4=Emilia |last5=Kowalczyk |first5=Magdalena |last6=Pels |first6=Katarzyna K. |last7=Wilczynski |first7=Grzegorz M. |last8=Wojcik |first8=Cezary |last9=Bialy |first9=Lukasz P. |title=Entosis: From Cell Biology to Clinical Cancer Pathology |journal=Cancers |date=1 September 2020 |volume=12 |issue=9 |pages=2481 |doi=10.3390/cancers12092481 |pmid=32883000 |pmc=7563411|doi-access=free }}</ref> In breast cancer, entosis correlates with two classical prognostic factors of breast cancer (HER2 and Ki67).<ref>
Dziuba, Ireneusz; Gawel, Agata M; Tyrna, Paweł ; Machtyl, Jędrzej; Olszanecka, Monika; Pawlik, Andrzej; Wójcik, Cezary; Bialy, Lukasz P; Mlynarczuk-Bialy, Izabela. "Homotypic Entosis as a Potential Novel Diagnostic Marker in Breast Cancer"
Int. J. Mol. Sci. 2023, 24(7), 6819; https://doi.org/10.3390/ijms24076819</ref> In the analysis of entosis of the clinical case - calculations of the frequency of entosis showed that the highest frequency of entosis is during the formation of metastasis and when the neoplastic process is very advanced, the frequency of entosis structures decreases.<ref> Dziuba, Ireneusz; Gawel, Agata M; Tyrna, Paweł ; Rybczynska, Jolanta; Bialy, Lukasz P; Mlynarczuk-Bialy, Izabela. "Fate of Entosis: From the Beginning to the End in Untreated Advanced Breast Cancer" Int J Mol Sci. 2023 ;24(15):12142; doi: 10.3390/ijms241512142. https://www.mdpi.com/1422-0067/24/15/12142</ref> This result suggests that entosis may be a regulated process depending on staging.
== Videos ==
* Entosis:  a cell-in-cell invasion and death process: https://hms.harvard.edu/news-events/multimedia/entosis
* Entosis of prostate cancer PC-3 cells: https://www.youtube.com/watch?v=R5zNk0uXJHA
* When cells invade: Entosis: https://www.youtube.com/watch?v=fJxA-XoAK-A
==See also==
*[[Apoptosis]]
*[[Autoschizis]]
*[[Necrosis]]
*[[Autophagy]]
==References==
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{{Use dmy dates|date=April 2017}}
[[Category:Cell biology]]