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Int. J. Mol. Sci. 2015, 16(12), 28296-28310;

The Importance of Caveolin-1 as Key-Regulator of Three-Dimensional Growth in Thyroid Cancer Cells Cultured under Real and Simulated Microgravity Conditions

Plastic, Aesthetic and Hand Surgery, Otto-von-Guericke University Clinic, Leipziger Str. 44, 39120 Magdeburg, Germany
Max Planck Institute for Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
Institute for Molecular Physiology and Biotechnology of Plants (IMBIO), Gravitational Biology Group, University of Bonn, Karlrobert-Kreiten-Str. 13, 53115 Bonn, Germany
Airbus Defense and Space GmbH (ADS), Claude-Dornier-Straße, 88090 Immenstaad, Germany
Institute of Biomedicine, Aarhus University, Wilhelm Meyers Allé 4, 8000 Aarhus C, Denmark
Author to whom correspondence should be addressed.
Academic Editor: William Chi-shing Cho
Received: 9 October 2015 / Revised: 12 November 2015 / Accepted: 20 November 2015 / Published: 30 November 2015
(This article belongs to the Collection Advances in Molecular Oncology)
Full-Text   |   PDF [1257 KB, uploaded 30 November 2015]   |  


We recently demonstrated that the CAV1 gene was down-regulated, when poorly differentiated thyroid FTC-133 cancer cells formed spheroids under simulated microgravity conditions. Here, we present evidence that the caveolin-1 protein is involved in the inhibition of spheroid formation, when confluent monolayers are exposed to microgravity. The evidence is based on proteins detected in cells and their supernatants of the recent spaceflight experiment: “NanoRacks-CellBox-Thyroid Cancer”. The culture supernatant had been collected in a special container adjacent to the flight hardware incubation chamber and stored at low temperature until it was analyzed by Multi-Analyte Profiling (MAP) technology, while the cells remaining in the incubation chamber were fixed by RNAlater and examined by mass spectrometry. The soluble proteins identified by MAP were investigated in regard to their mutual interactions and their influence on proteins, which were associated with the cells secreting the soluble proteins and had been identified in a preceding study. A Pathway Studio v.11 analysis of the soluble and cell-associated proteins together with protein kinase C alpha (PRKCA) suggests that caveolin-1 is involved, when plasminogen enriched in the extracellular space is not activated and the vascular cellular adhesion molecule (VCAM-1) mediated cell–cell adhesion is simultaneously strengthened and activated PRKCA is recruited in caveolae, while the thyroid cancer cells do not form spheroids. View Full-Text
Keywords: international space station; pathway studio; plasminogen; tissue factor; VCAM-1 international space station; pathway studio; plasminogen; tissue factor; VCAM-1

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Riwaldt, S.; Bauer, J.; Pietsch, J.; Braun, M.; Segerer, J.; Schwarzwälder, A.; Corydon, T.J.; Infanger, M.; Grimm, D. The Importance of Caveolin-1 as Key-Regulator of Three-Dimensional Growth in Thyroid Cancer Cells Cultured under Real and Simulated Microgravity Conditions. Int. J. Mol. Sci. 2015, 16, 28296-28310.

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