dc.contributor.author
Exner, Samantha
dc.contributor.author
Prasad, Vikas
dc.contributor.author
Wiedenmann, Bertram
dc.contributor.author
Grötzinger, Carsten
dc.date.accessioned
2019-04-16T11:12:55Z
dc.date.available
2019-04-16T11:12:55Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/24436
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-2208
dc.description.abstract
Somatostatin analogs (SSA) are well-established antisecretory drugs in functionally active neuroendocrine tumors (NET). Two placebo-controlled trials have recently demonstrated significant improvement of progression-free survival under SSA treatment. Furthermore, somatostatin receptor (SSTR) overexpression in NET has also been utilized for diagnostic imaging and peptide receptor radionuclide therapy (PRRT). However, PRRT in NET is associated mostly with partial and minor remission, while other radionuclide therapies reach complete remissions in up to 75% of cases. This study assessed a potential radio-sensitizing effect of SSA treatment in five established NET cell line models: BON, QGP-1, LCC-18, H727, and UMC-11. Irradiation was found to significantly inhibit proliferation, while no additional effect by octreotide treatment was observed. Intriguingly, no impact of SSA treatment alone was found in any of these NET cell lines when systematically analyzing cell viability, proliferation, and cell cycle distribution. Investigation of the causes for this octreotide resistance led to demonstration of low octreotide binding and scarce SSTR, specifically SSTR2 expression as compared to levels found in human NETs. The resistance toward SSA treatment in viability and proliferation assays could not be overcome by re-expression of SSTR2 in two of the cell lines. These results provide systematic evidence for a lack of authentic, tumor-like SSTR expression, and function in five frequently used NET cell line models and point to the need for more physiologic tumor model systems.
en
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
neuroendocrine tumor
en
dc.subject
somatostatin receptor
en
dc.subject
somatostatin analog
en
dc.subject
radiation sensitivity
en
dc.subject
peptide receptor radionuclide therapy
en
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit
dc.title
Octreotide Does Not Inhibit Proliferation in Five Neuroendocrine Tumor Cell Lines
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
146
dcterms.bibliographicCitation.doi
10.3389/fendo.2018.00146
dcterms.bibliographicCitation.journaltitle
Frontiers in Endocrinology
dcterms.bibliographicCitation.originalpublishername
Frontiers Media S.A.
dcterms.bibliographicCitation.volume
9
refubium.affiliation
Charité - Universitätsmedizin Berlin
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.bibliographicCitation.pmid
29681888
dcterms.isPartOf.issn
1664-2392