Gravitational effects on fibroblasts' function in relation to wound healing

Area of Science:

• Space biology
• Cell biology
• Dermatology

Background:

• Spaceflight poses risks to skin health, notably delayed wound healing, increasing infection susceptibility.
• Understanding fibroblast behavior under altered gravity is crucial for developing spaceflight countermeasures.
• Previous research indicates gravity affects cellular processes, but specific impacts on wound healing fibroblasts require further investigation.

Purpose of the Study:

• To investigate the effects of simulated microgravity and hypergravity on human dermal fibroblasts.
• To examine the combined influence of altered gravity and cortisol on fibroblast function.
• To identify cellular mechanisms underlying impaired wound healing in spaceflight conditions.

Main Methods:

• Human dermal fibroblasts were exposed to various simulated gravity levels (microgravity and hypergravity) using a Large Diameter Centrifuge.
• Cortisol was added to cell cultures to assess its interaction with gravity effects.
• Cellular responses, including cytokine secretion, extracellular matrix protein production, migration, and nuclear morphology, were analyzed.

Main Results:

• Cortisol significantly impacted the secretion of pro-inflammatory cytokines and extracellular matrix proteins.
• Altered gravity primarily delayed cellular migration and altered mechanosensitive cell structures.
• Transitions to 20g hypergravity induced changes in fibroblast nuclear morphology.

Conclusions:

• Gravity transitions and cortisol exposure differentially affect fibroblast functions critical for wound healing.
• Findings provide insights into cellular responses to the spaceflight environment.
• This research may inform the development of strategies to mitigate delayed wound healing in astronauts.