Search Results (194)

Nano- (NPs, <1 µm) and microplastics (MPs, 1 µm–5 mm) are ubiquitous contaminants whose toxicity to invertebrates carries implications at the individual scale and (although not yet quantitatively validated) at the population scale. This semi-systematic narrative review organizes available evidence within an adverse outcome pathway (AOP) framework, linking primary molecular initiating events (MIEs) to adverse outcomes while flagging evidence strength at each step. It involves a structured synthesis that applies selected PRISMA 2020 transparency principles, namely disclosed databases, a priori eligibility criteria, and explicit harvest and de-duplication counts, but does not attempt the exhaustive paired screening, formal risk-of-bias scoring, or quantitative meta-analysis of a full systematic review; this design was chosen because the marked heterogeneity of particle physicochemistry, exposure regimes, and endpoint metrics across the available literature makes pooled statistical synthesis premature. Evidence is appraised across Daphnia, Artemia, Chironomus, Caenorhabditis elegans, Eisenia, marine mollusks, and crustaceans. Polymer chemistry, size, surface charge, weathering, biofilm formation, additives, and adsorbed co-contaminants shape uptake and downstream toxicity. Reactive oxygen species, mitochondrial dysfunction, lysosomal destabilization, and ER stress recur as coupled key events downstream of four MIEs (direct membrane interaction, protein corona formation, surface-catalyzed redox chemistry, and Trojan horse delivery). Multi-omics datasets converge on dysregulated stress, repair, apoptotic, immune, and inflammatory programs; epigenetic marks are increasingly considered as substrates for persistent and potentially heritable toxicity, although stable transgenerational transmission remains poorly demonstrated. The review delivers (i) an AOP map with evidence-strength annotations (strong, moderate, emerging), (ii) a structured cross-study synthesis comparing NP and MP effect profiles, and (iii) a critical layer that reinterprets biphasic and apparently contradictory data as mechanistically informative once particle physicochemistry and tissue context are resolved. Progress will depend on standardized characterization, environmentally realistic mixtures, and AOP-anchored designs that distinguish experimentally demonstrated mechanisms from inferred mechanisms and theoretical extrapolations. Full article

Bamboo shoots, as the most nutritionally valuable food source for giant pandas during key reproductive seasons, are critical for conservation because their availability and timing directly influence panda foraging and habitat use. However, the molecular mechanisms through which altitudinal temperature variation governs rhizome shooting in staple food bamboos remain largely unknown. Here, we performed integrated metabolomic and transcriptomic analyses of Fargesia rufa rhizomes collected along an elevational gradient (1000 m, 1500 m, and 2000 m), with a critical paired comparison at 2000 m between a non-shooting cold gully-edge site (16.4 °C) and a shooting warm gully-center site (21.1 °C), where soil temperature is elevated by approximately 4 °C due to prolonged solar exposure. Our results demonstrate that soil temperature, rather than elevation per se, acts as the primary driver of rhizome shooting, with an apparent threshold near 20 °C. A core shooting metabolome (CSM) comprising 843 metabolites was consistently accumulated across all shooting conditions, which featured gibberellin/auxin precursors, TCA cycle intermediates, and phenylpropanoid compounds. Correspondingly, a core shooting transcriptome (Rh_shooting) of 10,970 genes was identified, which resolved into three functionally distinct temporal clusters: “shooting-on” (activated upon threshold crossing, enriched in hormone signaling and cell wall metabolism), “temperature-dose” (progressively upregulated with rising temperature, enriched in energy metabolism and defense), and “microenvironment-enhanced” (specifically upregulated in the high-elevation warm gully, enriched in photosynthesis and antioxidant pathways). Integrative network analysis further revealed zeatin riboside and multiple hub genes as central coordinators linking hormone signaling, energy metabolism, and cell wall remodeling. Collectively, these findings establish a molecular framework linking altitudinal temperature variation to bamboo rhizome regeneration—a process that directly determines the spatiotemporal availability of bamboo shoots for giant pandas. This work provides mechanistic insights into giant panda foraging ecology and has direct implications for predicting habitat quality under climate change and informing evidence-based conservation strategies for this flagship species and its critical food resource. Full article

This study investigates lichen colonisation on a medieval basalt Armenian cross-stone (khachkar) in the Noratus cemetery, the largest extant concentration of memorial khachkars in Armenia, integrating fine-scale vegetation sampling, microhabitat assessment, and multivariate analysis. A preliminary survey of c. 30 cross-stones confirmed that the selected one was representative of the site. Thirty-six evenly spaced relevés of 10 cm² were recorded across the surface, with lichens identified macroscopically in situ and supported by laboratory-verified reference material from outside the protected area. Microhabitat descriptors were recorded, and ecological preferences were assessed using indicator values. The main environmental drivers at Noratus appear to be high solar irradiation, pronounced aridity and especially elevated nutrient deposition. Numerical classification and ordination revealed three main lichen communities, structured primarily by micro-scale water availability, exposure, and nutrient enrichment, which occupy different portions of the monument. The absence of endolithic lichens, together with the dry–cold climate of Noratus and the resistance of basalt to bioweathering, suggests limited structural impact. However, pronounced chromatic alteration was observed, producing a characteristic polychromy on the cross-stones. Lichen removal is likely to be problematic due to the extent of the cemetery, the prevalence of vegetative reproduction, and rapid recolonisation of nitrophilous species. This is the first study ever carried out on lichen colonisation of Armenian cross-stones, which are inscribed on the UNESCO List of the Intangible Cultural Heritage of Humanity. The results provide a baseline for future monitoring and support a conservation approach balancing material risk assessment with aesthetic considerations. Full article

Accurate postmortem interval estimation is an important issue in forensic investigations. Entomological evidence is widely used to estimate the minimum postmortem interval (PMI_min), primarily based on insect development and succession on decomposing remains. However, once adult emergence has occurred and only empty puparia remain, the applicability of conventional development-based methods becomes limited. Empty puparia, which can persist at crime scenes for extended periods, may provide time-related information based on their weathering after adult emergence. Nevertheless, for Aldrichina grahami (Aldrich, 1930) (Diptera: Calliphoridae), a forensically important necrophagous species, systematic models for empty puparia weathering remain limited. In this study, a 13-month indoor exposure experiment was conducted to characterize weathering-associated changes in empty puparia of A. grahami using metabolomic and bacterial community analyses. The results showed that lipid metabolites, particularly long-chain fatty acids such as stearic and palmitic acids, decreased consistently with weathering time. In contrast, bacterial communities showed variation over time but exhibited weaker associations with weathering time. In internal cross-validation, the metabolomics model showed lower prediction error than the bacterial community model, while decision-level integration yielded the lowest error within this dataset. These results suggest that empty puparia undergo measurable molecular changes during indoor weathering, which may assist in estimating the post-eclosion interval (PEI) and thereby provide supplementary information for PMI_min assessment in long-interval cases. Full article

Q fever, caused by Coxiella burnetii, remains an important zoonotic disease with significant implications for animal health, livestock production, and public health. Epidemiological data regarding the circulation of C. burnetii in Romania remain limited, particularly in the western region of the country. This study aimed to assess the observed seropositivity and geographic distribution of anti-C. burnetii antibodies among sampled small ruminants from Western Romania. A cross-sectional sero-epidemiological survey was conducted using 546 serum samples collected from sheep (n = 451) and goats (n = 95) originating from five counties (Timiș, Arad, Bihor, Caraș-Severin, and Hunedoara). Sera were tested for IgG antibodies against C. burnetii using a commercial indirect enzyme-linked immunosorbent assay (ELISA). Overall, 87 animals were seropositive, corresponding to an observed seropositivity of 15.9% (87/546). Species-specific seropositivity was significantly higher in goats (25.3%) than in sheep (14.0%) (p = 0.006). Seropositive animals were detected in all surveyed counties, with prevalence ranging from 5.1% in Arad County to 21.3% in Timiș County. Significant geographic variation in seroprevalence was also observed among the investigated counties (p = 0.040). These findings indicate widespread serological evidence of exposure to Coxiella burnetii among the sampled small-ruminant population in Western Romania and reveal heterogeneous exposure patterns associated with both host species and geographic location. Continued surveillance integrating serological and molecular approaches is warranted to better characterize the epidemiology and transmission dynamics of C. burnetii within a One Health framework. Full article

Lyme borreliosis has been reported across China, but data on Borrelia burgdorferi sensu lato exposure in humans and infection in questing Ixodes ticks remains fragmented and heterogeneous. This systematic review and meta-analysis aimed to estimate the pooled seroprevalence of B. burgdorferi sensu lato exposure in humans and infection prevalence in questing or unfed Ixodes ticks in China and to explore potential sources of heterogeneity. Six English- and Chinese-language databases were searched from inception to 10 September 2025. Eligible cross-sectional studies reported both the number examined and the number positive, with a minimum sample size of 30. Human analyses were restricted to serological evidence, whereas tick analyses included questing or unfed Ixodes ticks collected from vegetation or the environment. Random-effects models, subgroup analyses, and univariate random-effects meta-regression were applied. A total of 186 studies were included, of which 167 reported human data, 22 reported PCR-based data from questing Ixodes ticks, and 3 reported both human and tick data. The pooled human seroprevalence was 7% (95% CI: 6–8%), and the pooled PCR-confirmed infection prevalence in questing Ixodes ticks was 20% (95% CI: 10–32%). Substantial heterogeneity was observed in both analyses. For questing Ixodes ticks, infection prevalence showed marked geographical heterogeneity, with the highest pooled estimate observed in Northeastern China. In univariate meta-regression, Northern China showed a significantly lower estimate than Northeastern China, whereas sampling year, reported Borrelia genospecies, and Ixodes species were not significantly associated with pooled prevalence. Leave-one-out analyses indicated that the pooled estimates were not driven by any single study. These findings demonstrate that human exposure and environmental circulation of B. burgdorferi sensu lato have been documented across multiple regions of China but remain highly heterogeneous. Full article

Background: SYHA1805 is a potent farnesoid X receptor (FXR) agonist currently in development for Metabolic Dysfunction-Associated Steatohepatitis (MASH). Methods: To determine the first-in-human (FIH) dose and guide its clinical development, an integrated approach combining in vitro and in vivo ADME and toxicological characterizations, cross-species allometric scaling (AS), and physiologically based pharmacokinetic (PBPK) modeling was employed. Results: Using monkeys and rats as extrapolation species, AS predicted a human intravenous clearance of 20.7 L/h and a steady-state volume of distribution of 15.1 L. Based on body surface area and exposure-based modeling, an FIH dosing regimen for single-dose administration was proposed, ranging from a 30 mg starting dose to a 3000 mg maximum, with an effective dose of 1150 mg. These dosing strategies were further supported by PBPK models, which accurately estimated human systemic exposure. The model simulations were subsequently validated by clinical trial data from a single ascending dose (SAD) study (CTR20202354). Conclusions: These findings establish a robust pharmacokinetic foundation for the continued clinical advancement of SYHA1805. Full article

Background: Produced by indoor Stachybotrys and Trichoderma spp., macrocyclic trichothecenes (MTs), a type of cytotoxic respirable molecule (<0.01–0.03 µm), inhibit protein/DNA/RNA production, damage mitochondria, and induce apoptosis. Dust-bound MTs remain toxic despite remediation/disinfection. Inhaled MTs easily cross tissue barriers, potentially reaching the placenta and the unborn. Methods: Retrospective medical record abstraction of pregnant females and offspring cohort exposed to indoor MTs, Stachybotrys, or Trichoderma to correlate professional indoor testing, exposure variables, mold species, environmental MTs, medical symptomatology, outcomes, and urine/milk MTs excretion. Results: In eight women from seven MT/mold-contaminated homes, with 21 pregnancies, complications occurred in 19 (90%) pregnancies, including miscarriages (38%) and premature labor (33%). Placental abnormalities in two women (25%) from the same home (calcification, chronic villitis, placental infarcts, double placenta, gritty membranitis). Birth defects in infants (38%) included renal hypertrophy, levocardia, patent foramen ovale, ventriculoseptal defect, ptosis, teeth, and “goosebump” black/grey skin discoloration. Later abnormalities included developmental delay, oropharyngeal hypotonic dysphagia, refractory eczema, and refractory perirectal rash progressing to intussusception. Lactation difficulties included grey-black oronasal drainage, thrush, projectile vomiting, choking, oropharyngeal neurologic damage, apnea, and respiratory arrest. Aspergillus +/− Penicillium exposure was documented in all, Stachybotrys (75%), Chaetomium (62%), Trichoderma (38%), and indoor MT contamination exposure (75%). Conclusions: In-utero indoor MTs and Stachybotrys exposure correlate strongly with adverse gestational, neonatal complications (miscarriage, congenital defects, and placental abnormalities). Exposure timing and severity correlate with adverse outcomes. Breastfeeding with indoor exposure appears hazardous. Environmental/human MTs testing appears useful for identifying MT contaminaion and/or exposure. Full article

Lead (Pb) is a persistent environmental contaminant and a major public health concern. This cross-sectional study investigated self-reported health symptoms and estimated dietary Pb exposure from aquatic animal consumption among residents living around Nong Han Lake, Thailand. Sociodemographic characteristics, dietary behaviors, and health symptoms were collected using a structured questionnaire. Pb concentrations were measured in three commonly consumed aquatic species, and species-specific estimated dietary Pb intake (EDI) was calculated from Pb concentrations and reported consumption patterns. Multivariable logistic regression identified factors associated with symptom reporting. Pb concentrations in all aquatic species were below the permissible limit (0.3 mg/kg wet weight). Median EDI was 0.1004 µg/kg bw/day (IQR: 0.0645–0.1785). Musculoskeletal pain (79.73%) and joint and muscle pain (71.62%) were the most commonly reported symptoms. This study found that female sex (aOR = 2.62; 95% CI: 1.099–6.249; p = 0.030), a lack of lead hazard training (aOR = 3.39; 95% CI: 1.373–8.418; p = 0.008), consumption of more than 300 g of aquatic animals per meal (aOR = 2.47; 95% CI: 1.230–4.960; p = 0.011), and long-term consumption exceeding 30 years (aOR = 2.16; 95% CI: 1.065–4.398; p = 0.033) were each independently associated with symptom reporting. Estimated dietary Pb intake (EDI) was not significantly associated with symptoms after multivariable adjustment (aOR = 1.30; 95% CI: 0.657–2.578; p = 0.450). These findings suggest that consuming large portions of aquatic animals, consuming aquatic animals over prolonged periods, and having limited awareness of lead-related hazards are potential pathways for dietary Pb exposure in this lake-dependent community. Full article

Rift Valley fever (RVF) is a mosquito-borne viral zoonosis that causes severe illness in livestock and humans, with significant economic and health repercussions. Mauritania is considered an RVF focus in West Africa. A cross-sectional survey was conducted in 2023 in 12 of Mauritania’s 15 provinces. Serum samples from 849 small ruminants (428 goats and 421 sheep) were analyzed by ELISA for IgG and IgM antibodies against RVF virus. Logistic regression analyses were performed to assess associations between seropositivity and species, age, sex, season, and geographic location. In total, 14.1% of the animals tested were positive for anti-RVFV IgG antibodies. There was no association between anti-RVFV IgG positivity and the ruminant species, the sex, the age and the season. Hodh El Gharbi had the highest seroprevalence (40.5%), followed by Adrar (19.8%) and Tagant (19.7%). The lowest levels were recorded in Tiris Zemmour (2%) and Inchiri (3%). Only two animals tested positive for IgM, suggesting limited recent viral activity. This nationwide survey confirms widespread exposure of small ruminants to RVFV in Mauritania. Strengthening longitudinal serological monitoring and integrating ecological and entomological data within the “One Health” approach will be essential to preventing future epidemics and protecting animal and human health. Full article

Micro- and nanoplastics (MNPs) are emerging global pollutants that pose a significant threat to living organisms due to their widespread presence, ingestion by aquatic species, and ability to cross biological barriers, including the blood–brain barrier. Zebrafish is a well-established and convenient model for ecotoxicological research because of its small size, optical transparency, fully sequenced genome, high genetic homology to humans, ease of breeding, and short life cycle. Exposure to MNPs affects multiple organ systems in zebrafish, including the brain, eyes, liver, intestine, gills, and reproductive system. These particles can induce oxidative stress, inflammation, and interference with diverse biomolecules, leading to adverse biological effects. An analysis of transcriptomic alterations induced by MNPs exposure can contribute to understanding the mechanisms of these adverse effects. In this narrative review, we classify existing studies on MNPs exposure in zebrafish by affected organ system and summarize the gene expression-based evidence of MNP-induced toxicity with a particular focus on high-throughput approaches such as RNA sequencing and single-cell RNA sequencing. Full article

Mpox is a zoonotic infectious disease caused by the species Orthopoxvirus monkeypox (MPV), which is becoming an increasing public health concern. While human-to-human transmission of the virus is well established, the role of domestic animals in MPV infection remains poorly understood. Investigating how the virus is transmitted among humans, dogs, and cats can improve our understanding of the disease’s pathogenesis and help develop strategies to limit its dissemination during future outbreaks. In this study samples were collected from four domestic animals (three dogs and one cat) in May 2023. These animals lived in a household where a human mpox case had been confirmed by PCR in March 2023, approximately 2 months before animal sampling. A plaque reduction neutralization test (PRNT) using vaccinia virus was performed to detect anti-orthopoxvirus (OPV) neutralizing antibodies (nAbs). Our data demonstrated that anti-OPV nAbs were present in samples obtained from three dogs and one cat with neutralization titers ranging from 1:5 to 1:20. These results indicate that the domestic animals were exposed to OPVs after contact with an individual with confirmed mpox, suggesting possible human-to-animal transmission within a household. Nevertheless, due to the cross-reactive immune response among OPVs, and the endemic circulation of vaccinia virus in Brazil, it is not possible to determine the specific viral species based solely on PRNT results. Therefore, these serological findings should be interpreted as evidence of OPV’s exposure rather than confirmed MPV infection. Full article

Quantitative structure–activity relationship and quantitative structure–property relationship (QSAR/QSPR)-based molecular toxicity prediction provides an in silico strategy for prioritizing environmental contaminants when longer-duration bioassay data are sparse. However, many Simplified Molecular-Input Line-Entry System (SMILES)-based machine learning models treat exposure duration as an unconstrained numerical covariate and provide limited information on whether predictions are supported by the observed temporal domain. Here, we evaluated an applicability-domain-aware chemoinformatics framework that combines transformer-derived molecular representations with toxicokinetic-informed temporal encoding and evidential uncertainty estimation. The approach replaces conventional ${log}_{10}$-transformed time encoding with a bounded first-order toxicokinetic saturation feature and combines this representation with Deep Evidential Regression to support a joint chemical–temporal view of the QSAR/QSPR applicability domain. Using experimentally derived U.S. EPA Ecotoxicology Knowledgebase (ECOTOX) fish EC50 mortality records, models were trained on 48,728 acute-duration observations and evaluated retrospectively on 2090 temporally separated longer-duration observations. The combined toxicokinetic and evidential model reduced temporal extrapolation error relative to conventional time encoding while maintaining comparable within-domain validation performance. The learned population-level timescale converged to 221 ± 3 h, consistent with accumulation timescales extending beyond standard acute fish test durations. Epistemic uncertainty was positively associated with absolute prediction error across all 10 folds, suggesting that the uncertainty estimates retained sample-level information relevant to applicability-domain-aware molecular toxicity screening. Cross-species analyses further showed that model behavior depended on training time coverage, with greater convergence when available assays covered a larger fraction of the learned timescale. These results suggest that toxicokinetic-informed temporal encoding can improve uncertainty-aware QSAR/QSPR modeling of environmental contaminant toxicity and support prioritization of compounds for further testing, while complementing rather than replacing chronic bioassays. Full article

Background: The lack of set up in vulnerable population settings increases inhabitant’s exposure to fecal–oral pathogens. Objectives: A cross-sectional study was conducted in two Nicaraguan Caribbean islands to determine the prevalence and associated risk factors for intestinal parasitism. Methods: A total of 228 stool samples were analyzed by modified concentration technique. A structured questionnaire was used to gather variables. Univariate and multivariable logistic regression analysis to determine potential risk factors was employed. Findings: In both islands, overall prevalence of parasitism reached 88.2%. Most parasitism with protist species appeared in El Bluff compared to Rama Cay (p < 0.0001). Trichuris trichiura was the dominant helminth species in El Bluff (79.8%) while Ascaris lumbricoides was in Rama Cay (64.7%). Those who live in Rama Cay had approximately a 78.8% lower chance (odds) (0.212; 95% CI: 0.069–0.541; p = 0.002) of experiencing parasitism than those in El Bluff. The use of latrines remained as the only significant predictor for parasitism (p = 0.013). Main Conclusion: It seems that Rama Cay currently has an improvement in the sanitary facilities that could limit protist parasitism. However, using latrines was assessed as a risk factor for being infected. In addition to the existence of latrines, their proper maintenance and cleaning is necessary to prevent parasitism. Full article

Brucellosis remains a significant public health and economic burden in many regions, primarily transmitted from livestock to humans through direct contact and environmental contamination. In this paper, we develop a novel cross-species epidemic model that couples the transmission dynamics of brucellosis among sheep, humans, and the environmental reservoir of Brucella. The sheep population is divided into susceptible, exposed, infectious, and vaccinated compartments, while the human population is stratified into susceptible and infected classes. Environmental brucella load is explicitly modeled, and distributed time delays are incorporated to account for incubation periods and delayed exposure risks in humans. We prove that all solutions are non-negative and ultimately bounded, ensuring biological consistency. The basic reproduction number ${\mathcal{R}}_0$ is derived using the next-generation matrix method. Using Lyapunov functionals and LaSalle’s invariance principle, we establish that the disease-free equilibrium is globally asymptotically stable when ${\mathcal{R}}_0\le 1$, whereas a unique endemic equilibrium exists and is globally asymptotically stable when ${\mathcal{R}}_0>1$. Sensitivity analysis identifies the environmental transmission rate, shedding rate, and disinfection as the most influential parameters. Treatment efficacy is shown to exhibit a critical threshold $p^{\mathrm{cr}}=1-1/{\mathcal{R}}_0$, above which eradication becomes feasible. Numerical simulations validate the theoretical findings and demonstrate that time delays affect outbreak timing but not asymptotic stability. These results provide quantitative guidance for brucellosis control strategies, emphasizing environmental sanitation, culling, and vaccination as key interventions. Full article