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Mechanical culture conditions effect gene expression: gravity-induced changes on the space shuttle
T G Hammond1, E Benes, K C O'Reilly
1Nephrology Section, Department of Medicine, Tulane/Veterans Affairs Environmental Astrobiology Center, New Orleans, Louisiana 70112, USA. thammond@mailhost.tcs.tulane.edu
Physiological Genomics
|October 4, 2000
Summary
Microgravity enables three-dimensional cell culture by avoiding gravity-dependent cell damage. Gene expression analysis revealed specific genes and transcription factors mediating this process in space.
Area of Science:
- Space biology
- Cell biology
- Biotechnology
Background:
- Three-dimensional suspension culture is limited by gravity-induced cell damage as aggregates grow.
- Microgravity offers a unique environment to overcome these limitations for cell and tissue culture.
Purpose of the Study:
- To identify genes and transcription factors involved in three-dimensional cell and tissue aggregate culture in microgravity.
- To understand the molecular mechanisms underlying successful suspension culture in space.
Main Methods:
- Primary human renal cortical cells were cultured in microgravity aboard the space shuttle.
- Gene expression analysis was performed on 10,000 genes using automated gene arrays.
- Comparison between microgravity and ground-based control samples.
Main Results:
- A distinct set of 1,632 genes were regulated in microgravity, independent of shear stress or heat shock responses.
- Key transcription factors, including Wilms' tumor zinc finger protein and vitamin D receptor, showed significant changes.
- Identified specific gene groups controlled by these transcription factors that mediate 3D suspension culture.
Conclusions:
- Microgravity provides a favorable environment for three-dimensional cell culture by mitigating gravity-related stress.
- Specific gene regulatory networks, involving novel transcription factors, are crucial for successful microgravity-based cell aggregation and culture.