Pollution of the aquatic environment by microplastic could be having a massive impact on marine life. As far as the dimensions of the microplastics decrease, the negative effects are also increasing. In this study, the effects of 1 µm diameter polystyrene microplastics (PSMs) on Daphnia magna and Neocaridina davidi were investigated. The acute toxicity test was conducted on Daphnia magna. According to the test LC50 value was calculated as 808.97 μg/mL. According to genotoxic evaluation on Neocaridina davidi with single cell gel electrophoresis (Comet), tail length, tail intensity and tail moment were increased by PSMs compared to the control.

Background: This study aimed to evaluate the therapeutic efficacy of intravesical tigecycline administration in a rat model of cystitis induced by a tigecycline-sensitive, extensively drug-resistant (XDR) Acinetobacter baumannii strain. Methods: Thirty-six female Wistar albino rats were inoculated intravesically with XDR A. baumannii to induce cystitis. Twenty-four rats that developed infection were divided into four groups: untreated control, saline irrigation, low-dose tigecycline (6.25 mg/kg), and high-dose tigecycline (25 mg/kg). Microbiological clearance was assessed via urine cultures on days 3 and 5. Bladder tissues were analyzed histopathologically and for genotoxicity using the Comet assay. Results: On day 5, microbiological clearance was significantly higher in tigecycline-treated groups compared to controls (p = 0.028). Histopathology revealed significantly more inflammation in the high-dose tigecycline group (p = 0.029). Genotoxicity was observed in both tigecycline groups, independent of dose (p < 0.05). Conclusions: Intravesical tigecycline demonstrated microbiological efficacy against XDR A. baumannii-induced cystitis. However, its inflammatory and genotoxic potential necessitates further preclinical evaluation.

Yeryüzünde gerek insan gerekse suda yaşayan organizmaların yaşamlarının devamlılığı açısından temiz su kaynakları giderek azalmaktadır. Tarımsal faaliyetler, sanayi atıkları ve evsel atıklardan kaynaklı gibi birçok kirletici suların kirlenmesine neden olmaktadır. Farklı kaynaklardan sulara karışan toksikantlar nedeniyle sularda yaşayan organizmalarda çeşitli genetik hasarlar ortaya çıkabilmektedir. Genetik materyaldeki hasarlar, sucul organizmaların adaptasyon kapasitesinde düşüş ve avcıdan kaçış gibi davranışlarda yetersizlik gibi yaşamsal önemde sorun yaratabilmektedir. Bu nedenle, organizmanın hayatta kalabilme yeterliliğinin korunabilmesi için genetik materyalin stabilitesi önemlidir. Bu çalışmada Uluabat Gölü’ndeki genotoksik potansiyel, farklı lokaliteden toplanan Cyprinus carpio (Sazan balığı) ve Silurus glanis (Yayın balığı) üzerinde tek hücre alkali jel elektroforezi (KOMET) ve mikronukleus (MN) teknikleri ile değerlendirilmiştir. Elde edilen sonuçlara göre Uluabat Gölü’nde ilkbahar ve yaz mevsimlerinde alınan kan örneklerindeki genotoksisite potansiyeli kış mevsimine göre yüksek bulunmuştur. Ayrıca su ve sedimente ait 9 farklı ağır metalin (Pb, Cd, Hg, As, Ni, Cr, Cu, Zn ve Mn) birikim düzeyleri analiz edilmiştir. Balık dokularında yapılan analiz sonuçlarına göre Hg kasta, As ve Zn böbrekte, Pb, Cd, Ni, Cr, Cu ve Mn karaciğerde daha fazla birikim gözlenmiştir.

Nanoplastics (NPs; ≤1 µm) have been detected in human placenta, blood, lung, atherosclerotic plaque, testis, semen, olfactory bulb, and brain, shifting the field from environmental description toward mechanistic interrogation of barrier crossing. This review synthesises current evidence on NP translocation across the intestinal epithelium, the blood–brain barrier (BBB) and the placental syncytiotrophoblast. We distinguish four evidence categories throughout the review: detection, association, mechanism, and causality. We also apply model-system labels (in silico, in vitro, ex vivo, animal, and human) to every mechanistic claim, so that the strength of each statement can be read off directly. Most current studies use pristine polystyrene nanoplastics at concentrations 3–6 orders of magnitude above plausible human exposure, so the mechanistic conclusions below are hypothesis-generating for human disease rather than definitive. We propose a working conceptual framework—corona-driven barrier selectivity (CDBS)—in which the particle–corona–surface complex, rather than the bare polymer, is hypothesised to dictate which receptor and transport machinery (TfR1, LRP1, FcRn, P-gp/BCRP, caveolae) each barrier engages. CDBS is offered as a hypothesis-stage organising tool requiring experimental validation, not as an established mechanism. We outline reported transport modes, including clathrin- and caveolin-mediated endocytosis, paracellular leakage via ROS-induced tight-junction disassembly, receptor-mediated transcytosis, and the candidate olfactory route. We emphasise that pristine polystyrene-bead doses commonly exceed plausible human exposure by 3–6 orders of magnitude, that detection methods underestimate sub-micrometre particles, and that causal links between NPs and human disease remain hypothesis-generating. A research agenda built on weathered reference materials, microphysiological systems, and integrative human biomarker science is proposed.

Sweet cherries (Prunus avium) are rich in flavonoids such as anthocyanins that are beneficial for the immune system. The aim of the present study was to investigate in vitro antigenotoxicity and anticytotoxicity of total antochyanins extracted from Prunus avium (TAP) using by chromosomal aberration (CA), single cell gel electrophoresis (Comet) and micronucleus assay (MN) in human peripheral lymphocytes. 50, 100, 200 and 400 µg/mL concentrations of TAP was screened for its protective activity using mytomicin-C and H 2 O 2 induced DNA damage in human lymphocytes. Also, positive, negative and solvent controls were used. According to the positive control TAP statistically decreased the abnormal cell percentage and CA/cell in 200 and 400 µg/mL at 24 h treatment and in all concentrations at 48 h. On the other hand, it was significantly increased the mitotic index in only 200 µg/mL at 24h and in all concentrations (except 200µg/mL) at 48h. Similarly, TAP were reduced MN frequency in all concentrations according to the positive control. In the comet assay, significant decreases in comet tail length, tail moment and tail intensity were observed in all concentrations. According to these results, we demonstrate that TAP has potent anticytotoxic and antigenotoxic effect against MMC and H2O2- induced genotoxicity.