Sex Role–Dependent Behavioral and Architectural Divergence in a Jumping Spider

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  Sex Role–Dependent Behavioral and Architectural Divergence in a Jumping Spider ABSTRACT Sex differences in behavior and functional traits are often attributed to differences in mating effort intensity, but the role of sex-specific parental demands remains poorly understood. Using the jumping spider Toxeus maxillosus —where males engage in mate searching and courtship without providing parental care, while females provide extended maternal care from egg attendance to offspring maturity (around 3 months)—we conducted an exploratory investigation into whether these distinct selective pressures led to divergence in spatial behaviors and nest architecture. Results revealed that males and females showed equivalent accuracy, latency, and learning-related performance in both a route-planning test under water stress and a color-pattern associative memory task. In contrast, during nest-construction assays, females built complex, multi-entrance structures that closely matched the container'...

Scorpion venom heat-resistant synthetic peptide regulates Nrf-2 to alleviate neuronal pyroptosis in an AD model induced by endoplasmic reticulum stress under PM2.5 exposure

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Scorpion venom heat-resistant synthetic peptide regulates Nrf-2 to alleviate neuronal pyroptosis in an AD model induced by endoplasmic reticulum stress under PM2.5 exposure

Abstract

In recent years, the impact of fine particulate matter (PM2.5) on the nervous system, particularly on neurodegenerative diseases, has garnered widespread attention. Epidemiological studies have shown that exposure to PM2.5 is closely associated with the development and progression of Alzheimer's disease (AD). However, the mechanisms through which PM2.5 exacerbates AD remain unclear. Scorpion venom heat-resistant synthetic peptide (SVHRSP) is a pharmacologically active product synthesised from the amino acid sequence of scorpion venom heat-resistant peptide. In this study, we investigated the mechanism through which PM2.5 exposure aggravates neuronal pyroptosis and validated the protective effects of SVHRSP against AD. PC12 and HT22 neuronal cells were used to construct in vitro models of AD. Mice were stereotactically injected with Aβ25-35 protein to induce AD. Subsequently, PM2.5 exposure-induced changes in ER stress, pyroptosis, and oxidative stress in AD models, were detected through in vivo and in vitro experiments. The results indicated that PM2.5 exposure aggravated cognitive impairment, ER stress, and pyroptosis in mice with AD. Conversely, treatment with SVHRSP counteracted the damage induced by PM2.5 exposure. At a mechanistic level, PM2.5 might enhance oxidative stress and trigger pyroptosis by suppressing the expression of Nrf-2. These findings offer novel insights into the mechanisms through which PM2.5 exposure hastens the progression of AD and propose a promising strategy for the pharmacological treatment of AD.

Duan, K., Qin, C., Zhang, Y., Li, D., Zhang, J., & Li, F. (2025). Scorpion venom heat-resistant synthetic peptide regulates Nrf-2 to alleviate neuronal pyroptosis in an AD model induced by endoplasmic reticulum stress under PM2.5 exposure. Toxicon, 108504. https://doi.org/10.1016/j.toxicon.2025.108504