Simulated Microgravity-Induced Changes to Drug Response in Cancer Cells Quantified Using Fluorescence Morphometry.

Area of Science:

• Space Biology
• Cellular Biology
• Pharmacology

Background:

• Microgravity causes cellular dysfunctions in astronauts, affecting bone, muscle, and immune systems.
• Cellular changes under microgravity include altered morphology, gene expression, and metabolic pathways.
• The impact of microgravity on cellular drug responses remains unclear.

Purpose of the Study:

• To investigate whether microgravity affects drug response in cancer cells.
• To assess the influence of simulated microgravity on the efficacy of common cancer drugs.

Main Methods:

• Used adherent (T98G) and suspension (K562) cancer cell lines.
• Exposed K562 cells to simulated microgravity using a NASA rotary cell culture system for 48 hours.
• Treated microgravity-exposed K562 cells with hydroxyurea and paclitaxel, analyzing nuclear-to-cytoplasm ratio via fluorescence-guided morphometry.

Main Results:

• Simulated microgravity confirmed known cellular effects.
• Microgravity abolished a significant reduction in the nuclear-to-cytoplasm ratio in hydroxyurea-treated cancer cells (p < 0.01).

Conclusions:

• Microgravity significantly alters cancer cell responses to specific chemotherapy drugs.
• Further research is crucial to understand microgravity's impact on cellular drug response for space medicine applications.
• Findings are relevant given the increasing need for space exploration and astronaut healthcare.