Study Finds No Sex Differences in Anorexia Susceptibility in Animal Model
Researchers using an activity-based anorexia model in mice found that both male and female mice exhibit similar vulnerable and resilient phenotypes when exposed to food restriction and exercise opportunities, with no significant sex differences in susceptibility. While anorexia nervosa is diagnosed more frequently in women than men, this animal study suggests biological sex may not explain the prevalence gap. The findings suggest sociocultural pressures rather than biological mechanisms may drive the observed sex differences in human anorexia rates.
A preprint study published on bioRxiv examined whether sex differences in anorexia nervosa prevalence stem from biological mechanisms by testing male and female mice in an activity-based anorexia (ABA) model. Researchers exposed young adult male C57BL/6N mice to the same protocol previously used with females and measured daily bodyweight, food intake, water intake, and wheel running. The results showed that males exhibited the same two phenotypes as females—vulnerable mice with catastrophic weight loss driven by excessive running, and resilient mice with weight stabilization through adaptive eating changes—with no significant sex differences in the proportion exhibiting each phenotype or their behavioral characteristics. The study found that vulnerability was not driven by mice choosing to run instead of eat in either sex. The authors conclude that since the ABA model shows similar behavioral responses to starvation across sexes, the higher prevalence of anorexia nervosa in women may be attributable to stronger sociocultural pressures on women to lose weight rather than inherent biological sex differences.
Limitations & open questions
The study's own limitations and open questions include: whether findings in C57BL/6N mice generalize to other mouse strains or species; whether the ABA model fully captures the complexity of human anorexia nervosa, which involves psychological, social, and cultural factors beyond food restriction and activity; and whether the study examined potential hormonal or neurobiological mechanisms that might differ between sexes despite similar behavioral phenotypes.
What different sources said
- bioRxivCenter
Vulnerability and Resilience to Activity-Based Anorexia is Not Sex-Dependent
Related
Fluorescence Correlation Spectroscopy Used to Monitor Chlamydia Protein Production in Cell-Free System
Researchers used fluorescence correlation spectroscopy (FCS) to track the real-time production of a Chlamydia outer protein (CopB) fused with a fluorescent marker in a cell-free protein synthesis system. The technique allowed them to measure protein concentration, size, aggregation, and maturation rates without requiring protein purification. This approach could streamline the characterization of proteins during synthesis for research and biotechnology applications.
DNA Origami Nanoparticles with Oligolysine Coating Show Promise for Retinal Cell Uptake
Researchers found that coating DNA origami nanoparticles with PEG5K-K10, a cationic polymer, significantly improves their uptake into retinoblastoma cells while maintaining safety and mobility in the eye. The coating was essential for cell internalization and did not impair the particles' ability to diffuse through the vitreous humor. These findings suggest DNA origami nanoparticles could be viable carriers for delivering therapeutic agents to treat eye diseases.
Spatial Clustering of Adhesion-Deficient Cells Controls Epithelial Tissue Rigidity, Study Shows
A computational study using vertex modeling demonstrates that how adhesion-deficient cells are spatially arranged in epithelial tissue—not just their number—determines whether the tissue loses mechanical rigidity. Clustered mutant cells cause sustained mechanical changes through sequential boundary removal, while randomly distributed ones are rapidly eliminated with minimal lasting effects. The findings suggest spatial organization is a key factor in early-stage cancer progression and epithelial-mesenchymal transition.