Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression data from SPHINX (SPaceflight of Huvec: an INtegrated eXperiment)

ABSTRACT: Changes in the physical environment modulate cell responses and may lead to the impairment or even failure of tissue function as a result of mechanotransduction processes. It has been suggested that this situation occurs in some age-related diseases and some pathological conditions observed in space, such as cardiovascular deconditioning, bone loss, muscle atrophy, and impaired immune responses. All of these are associated with endothelial dysfunction but the precise mechanism is still unclear. We used the microarray approach to obtain insights into the mechanism responsible for endothelial dysfunction by taking advantage of the challenging environment of gravitational unloading onboard the International Space Station. The effects of gravitational unloading on HUVEC gene expression were investigated by means of cDNA microarray analyses of six randomly chosen samples (three for each of the two conditions of spaceflight and 1g) using Affymetrix Gene Human 1.0 ST Arrays

ORGANISM(S): Homo sapiens

SUBMITTER: Silvia Bradamante

PROVIDER: E-GEOD-43582 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Abstract Background The extraordinarily resistant bacterium Deinococcus radiodurans withstands harsh environmental conditions present in outer space. Deinococcus radiodurans was exposed for one year outside the International Space Station within Tanpopo orbital mission to investigate microbial survival and space travel. In addition, a ground-based simulation experiment with conditions, mirroring those from Low Earth orbit, was performed. Methods We monitored Deinococcus radiodurans cells during early stage of recovery after Low Earth orbit exposure using electron microscopy tools. Furthermore, proteomic, transcriptomic and metabolomic analyses were performed to identify molecular mechanisms responsible for the survival of Deinococcus radiodurans in Low Earth orbit. Results D. radiodurans cells exposed to low Earth orbit conditions do not exhibit any morphological damage. However, an accumulation of numerous outer-membrane associated vesicles was observed. On levels of proteins and transcripts, a multifaceted response was detected to alleviate cell stress. The UvrABC endonuclease excision repair mechanism was triggered to cope with DNA damage. Defense against reactive oxygen species is mirrored by the increased abundance of catalases and is accompanied by the increased abundance of putrescine which works as scavenging molecule. In addition, several proteins and mRNAs, responsible for regulatory and transporting functions showed increased abundances. The decrease in primary metabolites indicate alternations in the energy status, which is needed to repair damaged molecules. Conclusion Low Earth orbit induced molecular rearrangements trigger multiple components of metabolic stress response and regulatory networks in exposed microbial cells. Presented results show that the non-sporulating bacterium Deinococcus radiodurans survived long-term Low Earth orbit exposure if wavelength below 200 nm are not present, which mirrors the UV spectrum of Mars, where CO2 effectively provides a shield below 190 nm. These results should be considered in the context of planetary protection concerns and the development of new sterilization techniques for future space missions.

Dataset Information

Expression data from SPHINX (SPaceflight of Huvec: an INtegrated eXperiment)

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