Aarhus Universitet

Jayashree Sahana

Key Proteins Involved in Spheroid Formation and Angiogenesis in Endothelial Cells After Long-Term Exposure to Simulated Microgravity

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  • Anita Dittrich
  • Daniela Grimm
  • Jayashree Sahana
  • Johann Bauer, Max-Planck Institute for Biochemistry, Martinsried, Germany.
  • ,
  • Marcus Krüger, Clinic for Plastic, Aesthetic and Hand Surgery, Otto-von Guericke-University, Magdeburg, Germany.
  • ,
  • Manfred Infanger, Clinic for Plastic, Aesthetic and Hand Surgery, Otto-von Guericke-University, Magdeburg, Germany.
  • ,
  • Nils E Magnusson

BACKGROUND/AIMS: Cardiovascular complications are common in astronauts returning from a prolonged spaceflight. These health problems might be driven by complex modulations of gene expression and protein synthesis in endothelial cells (ECs). Studies on the influence of microgravity on phenotype, growth pattern and biological processes of ECs can help to understand these complications.

METHODS: We exposed ECs (EA.hy926) to a Random Positioning Machine (RPM). Proteins associated with cell structure, angiogenesis and endothelial dysfunction were investigated in distinct pools of multicellular spheroids (MCS), adherent cells (AD) and tubular structures (TS) formed after a 35-day RPM-exposure.

RESULTS: Combining morphological and molecular approaches, we found AD, MCS and TS with changes in the synthesis and release of proteins involved in three-dimensional growth. Fibronectin and monocyte chemoattractant protein-1 (MCP-1) mRNAs and protein contents were elevated along with an increased secretion of vascular endothelial growth factor (VEGF), interleukin (IL)-6, IL-8, MCP-1, intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1), neutrophil gelatinase-associated lipocalin (NGAL) and regulated on activation, normal T cell expressed and secreted (RANTES) proteins in the culture supernatant as determined by multianalyte profiling technology. Together they form a network of interaction.

CONCLUSIONS: These results show that a prolonged RPM-exposure of ECs induced TS and MCS formation. The factors VEGF, NGAL, IL-6, IL-8, MCP-1, VCAM-1, ICAM-1, fibronectin and RANTES seem to be affected when gravity is omitted.

TidsskriftCellular Physiology and Biochemistry
Sider (fra-til)429-445
Antal sider17
StatusUdgivet - mar. 2018

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