All articles tagged with #sex differences
UTEP researchers report that caffeine consumed at night increases impulsive behavior in fruit flies, especially in females, while daytime caffeine has no similar effect; the study, published in iScience, suggests a time-of-day modulation of caffeine’s impact on behavioral control with potential implications for night-shift workers.
A large Australian Parkinson's Genetics Study (n=10,929) finds Parkinson's disease presents and progresses differently by sex and highlights the prominence of non-motor symptoms. Onset is younger for women (63.7) than men (64.4), and women have more pain and falls, while men show more memory changes and impulsive behaviors. The disease is ~1.5x more common in men; environmental risks (pesticide exposure, traumatic brain injury, high-risk occupations) are common and higher in men. About 25% have a family history; only 10–15% linked to known gene mutations, with most risk due to gene–environment interaction and aging. Limitations include self-reported data, a ~6% response rate, and predominantly European ancestry. Researchers plan to use smartphones and wearables to collect richer data, aiming for earlier risk identification and more personalized management.
Researchers used RNAscope to build the first sex-specific atlas of GLP-1 expression in the mouse brain, mapping GLP-1 across 25 brain nuclei in three female and three male mice. They found notable sex differences: females have higher GLP-1 density in hindbrain appetite regions (ROb, SolV, SolM), while males show higher GLP-1 in the olfactory bulb, with some regions showing female-only (ventral tegmental area) or male-only (lateral hypothalamus) expression. The atlas helps explain why women often lose more weight on GLP-1 drugs like semaglutide and suggests potential sex-specific avenues for treating addiction, depression, and cognitive decline, though limitations include the small sample size and the fact that transcript presence does not prove peptide release or function.
A Mayo Clinic study of 415 participants found that older women with Alzheimer's who tested positive for the Parkinson's-related protein alpha-synuclein accumulated tau about 20 times faster than men with the same abnormal protein, suggesting alpha-synuclein may accelerate Alzheimer's progression in women. The findings indicate sex-specific disease trajectories and potential biomarker-guided therapies, but replication is needed before changing treatment approaches.
A Mayo Clinic study finds that women with coexisting alpha-synuclein (Parkinson’s) and tau (Alzheimer’s) abnormalities experience tau accumulation and brain degeneration up to 20 times faster than those without the co-pathology, a sex-specific effect not seen in men, suggesting the need for gender-tailored screening and treatments.
New research combining mouse experiments with human vehicle‑crash data suggests that pain after injury lasts longer in women because monocytes produce less IL-10, a molecule that both reduces inflammation and directly dampens pain signals; testosterone boosts IL-10 production in male monocytes, helping men recover faster. This shifts the view of the immune system from solely driving pain to also helping resolve it, pointing to therapies that enhance the body's natural pain‑resolution pathways to prevent chronic pain.
A new Science Immunology study links IL-10–producing monocytes to an immune brake that dampens pain after injury. In mice, males had more IL-10–producing cells and recovered faster, with pain lasting longer when IL-10 or its receptor was blocked. Human data from the AURORA trauma study showed higher IL-10 levels at injury in men and lower subsequent pain, suggesting a biological basis for women’s longer-lasting pain. While not the sole pathway for all chronic pain, the findings point to immune signaling as a potential target, with ideas like skin-applied testosterone to modulate IL-10–positive monocytes under exploration (noting more research is needed).
Researchers mapped nearly 7 million cells from 21 mouse organs at three ages to create the most detailed aging atlas yet, finding that aging proceeds in a synchronized, body-wide fashion with about a quarter of cell types changing in abundance and notable sex differences; the study also identified shared DNA-regulatory hotspots and cytokine-linked changes that could become targets for therapies aiming to slow aging across multiple organs.
A Johns Hopkins Medicine study of 243 adults with early Lyme disease found sex- and menopause-related differences in presentation: men were more likely to test positive and show more severe disease at diagnosis, while certain symptoms were more common in women (heart palpitations, vomiting, light sensitivity) and sleep problems were more common in men, highlighting the need to consider sex and hormonal status in diagnosing and managing early Lyme disease.
A Science Signaling study shows acetate, a by-product of metabolism, enhances long-term memory in female mice by promoting histone acetylation and upregulating learning-related genes in the dorsal hippocampus; the effect is minimal in males and requires concurrent learning activity.
A study of 1,286 people aged 8–100 using MRI finds sex differences in brain connectivity are minimal in early life but widen at puberty and persist into adulthood, in both structural and functional networks. The timing roughly tracks sex-hormone changes and may relate to differing risks of mental-health disorders between men and women. The work is a bioRxiv preprint and relies on birth sex data; some scientists caution that differences may reflect gender roles or a mosaic of brain features rather than a binary sex, so conclusions are preliminary.
Using nearly 800 prenatal and postnatal brain scans, Cambridge researchers mapped brain growth from mid‑pregnancy to the first month after birth and found sex differences emerge before birth, with male brains showing greater overall growth. White matter drives mid‑pregnancy growth while grey matter dominates late pregnancy and after birth, and subcortical grey matter peaks earlier than cortical regions. The team plans to test whether prenatal sex hormones contribute, with potential relevance to neurodevelopmental conditions such as autism.
A large analysis of the CARDIA study followed more than 5,000 adults for up to 30 years and found that men develop cardiovascular disease about seven years earlier than women, with the biggest gap in coronary heart disease (roughly a decade earlier). Stroke and heart failure occur at similar ages between sexes. The gap persists even after adjusting for common risk factors, suggesting additional biological or social factors may contribute. The findings support earlier heart-health screening for men in their 30s while recognizing that women's risk remains high, especially after menopause, and the study has limitations inherent to observational research.
A UK Biobank study of 61,290 MRI scans used surface-to-surface analysis to link gluteus maximus morphology to type 2 diabetes risk, finding men with T2D tend to have a flattened, atrophied glute, while women show outward bulging from fat deposition. Larger gluteus maximus at baseline linked to lower future diabetes risk after adjusting for age, BMI, and lifestyle. The findings suggest muscle phenotype, not just quantity, matters for diabetes risk and could inform clinical assessments, though MRI-based shape analysis is not scalable for routine care and requires further longitudinal validation.
A study reveals that PTSD has different biological roots in men and women, with men showing deficits in stress-regulating lipids and women exhibiting heightened systemic inflammation, suggesting the need for sex-specific treatments.