Biology subjects

Daiber, A.

Publications and source records attributed to Daiber, A..

4 recordsLinked to original sources

bioRxiv2026

Plasma untargeted metabolomics reveals distinct metabolic disturbances between sexes following inhalation of ultrafine particles and exposure to aircraft noise in mice

Traffic noise and air pollution, particularly ultrafine particles (UFP), are significantly associated with health risks. However, the systemic metabolic consequences of the combined effects of UFP and aircraft noise (AN) exposure on health remain poorly understood. We aimed to investigate changes in plasma metabolites in healthy wildtype C57BL/6J mice following whole-body inhalation exposure to UFP (average diameter <40 nm), AN and their combination (UFP+AN). Liquid chromatography-mass spectrometry (LC-MS)-based untargeted plasma metabolomics analysis was undertaken for UFP, AN, and combined UFP+AN-exposed mice of both sexes. This study identified a total of 1146 plasma metabolites. Across exposure groups, AN induced the greatest plasma metabolomic changes in both sexes, while UFP significantly altered metabolites only in females, indicating a sex-specific response. The combined UFP+AN exposure produced a modestly enhanced effect in males compared with either single exposure but showed an attenuated effect in females. Pathway analyses revealed that lipid and amino acid metabolism were the most affected, followed by xenobiotics, and cofactors and vitamins, after exposure in both female and male mice. Additionally, in the clean air control group, we identified sex differences in 49 plasma metabolites, which mostly included lipids and amino acids. Following exposure, however, sex-dependent metabolic differences became more pronounced and exposure-specific, suggesting that UFP and AN have distinct effects on plasma metabolome of male and female mice that extend beyond baseline sexual dimorphism observed in unexposed animals. To our knowledge, this study is the first comprehensive characterization of systemic metabolic changes in mice after combination of UFP and AN exposure, providing new insight into the interplay between traffic noise and air pollution health risks.

pharmacology and toxicology↗

bioRxiv2024

Noise Stress induces Cardiovascular Metabolic Shifts

Environmental stressors present in the modern world can fundamentally affect humans physiology and health. Exposure to stressors like air pollution, heat, and traffic noise has been linked to a pronounced increase in non-communicable diseases. Specifically, aircraft noise has been identified as a risk factor for cardiovascular and metabolic diseases, such as arteriosclerosis, heart failure, stroke, and diabetes. Noise stress leads to neuronal activation with subsequent stress hormone release that ultimately leads to activation of the renin-angiotensin-aldosterone system, increasing inflammation and oxidative stress, dramatically affecting the cardiovascular system. However, despite the epidemiological evidence of a link between noise stress and metabolic dysfunction, the consequences of exposure at the molecular, metabolic level of the cardiovascular system are largely unknown. Here we use a murine model system of aircraft noise exposure to show that noise stress profoundly alters heart metabolism. Within days of exposing animals to aircraft noise, the heart has a reduced potential for utilising fatty-acid beta-oxidation, the tricarboxylic acid cycle, and the electron transport chain for generating ATP. This is compensated by shifting energy production towards glycolysis. Intriguingly, the metabolic shift is reminiscent of what is observed in failing and ischaemic hearts. Our results demonstrate that within a relatively short exposure time, the cardiovascular system undergoes a fundamental metabolic shift that bears the hallmarks of cardiovascular disease. Overall, aircraft noise induces rapid, detrimental metabolic shifts in the heart, resembling patterns seen in cardiovascular diseases. These findings underscore the urgent need to comprehend the molecular consequences of environmental stressors, paving the way for targeted interventions aiming at mitigating health risks associated with chronic noise exposure in our modern, noisy environments.

systems biology↗

bioRxiv2021

L-citrulline ameliorates pathophysiology in a rat model of superimposed preeclampsia

Preeclampsia, characterized by hypertension, proteinuria, and fetal growth restriction, is one of the leading causes of maternal and perinatal mortality. By far, there is no effective pharmacological therapy for preeclampsia. The present study was conducted to investigate the effects of L-citrulline supplementation in Dahl salt-sensitive rat, a model of superimposed preeclampsia. Parental DSSR were treated with L-citrulline (2.5 g/L in drinking water) from the day of mating to the end of lactation period. Blood pressure of the rats was monitored throughout pregnancy and markers of preeclampsia were assessed. Endothelial function of the pregnant DSSR was assessed by wire myograph. L-citrulline supplementation significantly reduced gestational hypertension, proteinuria, and levels of circulating soluble fms-like tyrosine kinase 1 in DSSR. L-citrulline improved maternal endothelial function by augmenting the production of nitric oxide in the aorta and improving endothelium-derived hyperpolarizing factor-mediated vasorelaxation in resistance arteries. L-citrulline supplementation improved placental insufficiency and fetal growth, which were associated with an enhancement of angiogenesis and reduction of fibrosis and senescence in the placentas. In addition, L-citrulline downregulated genes involved in the toll-like receptor 4 and nuclear factor-{kappa}B signaling pathway. In conclusion, this study shows that L-citrulline supplementation reduces gestational hypertension, improves placentation and fetal growth in a rat model of superimposed preeclampsia. L-citrulline supplementation may represent an effective and safe therapeutic strategy for preeclampsia that benefit both the mother and the fetus.

pharmacology and toxicology↗

bioRxiv2021

NECAB2 orchestrates an endosomal pathway of mitochondrial quality control at striatal synapses

Synaptic signaling depends on ATP generated by mitochondria. Due to extensive connectivity, the striatum is especially vulnerable to mitochondrial dysfunction and thus requires efficient mitochondrial quality control and repair. We found that global knockout of the neuronal calcium-binding protein 2 (NECAB2) in the mouse causes loss of striatal synapses and behavioral phenotypes related to striatal dysfunction such as reduced motivation and altered sensory gating. Striatal mitochondria from Necab2 knockout mice are more abundant and smaller. They are characterized by increased respiration and superoxide production resulting in oxidative stress. This accumulation of dysfunctional mitochondria is caused by a defective assembly of mitochondria with early endosomes in a pathway that involves the small GTPase Rab5 and its guanine nucleotide exchange factor Alsin/ALS2. NECAB2 therefore participates in an endosomal pathway of mitochondrial stress response and repair important for striatal function.

neuroscience↗