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Microgravity-induced apoptosis in cultured glial cells
B M Uva1, M A Masini, M Sturla
1Dipartimento di Biologia Sperimentale, Ambientale ed Applicata. Università di Genova, V.le Benedetto XV n. 5, 16132 Genova, Italy. uvab@unige.it
European Journal of Histochemistry : EJH
|December 11, 2002
Summary
Microgravity exposure induces apoptosis, or programmed cell death, in C6 glioma cells within 30 minutes. However, these glial cells adapt to altered gravity by 32 hours, reducing the apoptotic response.
Area of Science:
- Cell Biology
- Space Biology
- Neuroscience
Background:
- Apoptosis is programmed cell death crucial for development and tissue homeostasis.
- External factors like radiation and heat can induce apoptosis.
- Spaceflight's effect on the nervous system at the cellular level, particularly apoptosis, is understudied.
Purpose of the Study:
- To investigate the impact of microgravity on apoptosis in cultured C6 glioma cells.
- To determine the time course of apoptotic responses to altered gravity.
Main Methods:
- C6 glioma cells were exposed to microgravity (0xg) using a 3D clinostat for durations of 15 min to 32 hours.
- Apoptosis was assessed via morphological analysis of nuclear changes, caspase-7 immunostaining, and DNA fragmentation using the TUNEL assay.
Main Results:
- Significant apoptotic morphological alterations, including chromatin condensation and nuclear fragmentation, were observed after 30 minutes of microgravity exposure.
- Caspase-7 activation and DNA fragmentation were detected in cells after 30 minutes of microgravity.
- A marked reduction in apoptotic nuclei was observed by 32 hours, suggesting cellular adaptation.
Conclusions:
- Microgravity can rapidly induce apoptosis in glial cells.
- C6 glioma cells demonstrate an adaptive response to prolonged microgravity exposure.
- These findings highlight the sensitivity of nervous system cells to gravitational changes.