Sex-specific cardiovascular adaptations to simulated microgravity in Sprague-Dawley rats

This research study aimed to understand how the heart, kidneys, body weight (BW), fat percentage, lean mass, certain chemicals related to inflammation and aging like COX-2 and eNOS, calcium content in blood vessels, DNA damage markers such as 8-OHdG, hormone levels including GPER which is linked with estrogen receptors, PPARγ involved in fat metabolism, the stress response system called HPA axis are affected by a simulated space environment here on Earth. The study used specialized tests to compare these factors between male and female rats after they experienced conditions similar to what astronauts might feel during long-duration space missions (like microgravity). The findings showed that there were some differences in how the heart, kidneys, body composition, fat distribution, chemical markers of inflammation or aging, hormone levels and stress response system functioned between male and female rats after this simulation.

This research paper investigates the effects of hindlimb unloading (HLU) on pulse wave velocity (PWV), a measure of arterial stiffness, and its sex-dependent correlations in Sprague Dawley rats. The study employs one-way or two-way ANOVA followed by Bonferroni post hoc tests to analyze the data statistically significant at p<0.05 using GraphPad Software's Prism 7 (San Diego, CA). The methodology includes a DCS analysis that creates an indexed network for visualizing binary interactions of variables with large sex-wise differences in correlations under microgravity conditions and their independent correla tions to PWV. The study examines the expression levels of GPER (G protein-coupled estrogen receptor), eNOS, COX-2, 8-OHdG, SANS space flight associated neuro-ocular syndrome ROIs regions of interest and other variables in both male and female SD rats subjected to HLU.