Effects of spaceflight aboard the International Space Station on mouse estrous cycle and ovarian gene expression

This study aimed to understand how certain treatments might affect the brains and behavior of laboratory mice, which can help scientists learn more about human health too because many biological processes are similar across species. The researchers used a special type of MRI (a brain scan) that doesn't require surgery or harmful radiation to look at how different treatments might change the mouse brains over time without affecting their well-being, which is important for animal welfare and ethical science practices. To make sure they had enough information from a variety of mice while also respecting space limitations on equipment used in research (like those that could be sent to space), the scientists carefully planned how many mice would take part in their study, which was 40 in total-10 for each treatment group. They wanted to make sure they had strong evidence about what works and doesn't work with these treatments without harming any animals or using more resources than necessary.

Title: MRI-Based Neuroimaging in Mouse Models to Assess the Effects of Space Hardware Constraints on Experimental Cohort Size and Replication Fidelity Abstract: This study aimed to investigate how NASA's space hardware constraints impact experimental cohort size, replication fidelity, and ultimately data quality within life sciences research. The experiment was designed with a focus on MRI-based neuroimaging in mouse models (C57Bl/6J), adhering strictly to the ARRIVE guidelines for reporting animal studies. Four distinct treatment groups were established using 10 replicates each, totaling 40 mice across all cohorts. Methodology: The study utilized MRI-based neuroimaging techniques in a controlled laboratory setting with female C57Bl/6J mice of approximately six months old (mean age = 16 weeks). Each treatment group received distinct interventions, and the effects were assessed through comprehensive imaging analyses.