Analyzing real-time PCR data by the comparative C(T) method

Relationship between the expression levels of myogenic regulatory factor genes and carcass characteristics in Kivircik and Hungarian Merino lambs

This study aimed to investigate the expression profiles of the myogenic regulatory genes MYOD1, MYOG, MYF5, MYF6, and MSTN in longissimus dorsi muscle, as well as the correlation of the expression levels of these genes with carcass characteristics and growth performance in the Kivircik and Hungarian Merino sheep breeds. The expression levels of the MYF5, MYF6, and MYOG genes were found to be significantly correlated with the rib proportion, the expression level of the MYOG gene was identified as being the main determinant of variations in the rib proportion in the Kivircik lambs. The regression analysis results revealed that the expression levels of the MYF5 and MSTN genes played an essential role in determining the cold carcass dressing percentage in Hungarian Merino lambs. Further, as a result of the regression analysis, the model including the expression level of the MYF6 gene demonstrated that this gene could be responsible for 36.4% of the differences observed in cold carcass weight. In conclusion, the findings of this study suggest that the expression levels of the MYF5, MYF6, and MYOG genes were associated with various carcass traits, particularly in the Kivircik breed, and these genes hold potential as markers for enhancing breed productivity.

SIRT1/DNMT3B-mediated epigenetic gene silencing in response to phytoestrogens in mammary epithelial cells

We performed an integrated analysis of genome-wide DNA methylation and expression datasets in normal cells and healthy animals exposed to polyphenols with estrogenic activity (i.e. phytoestrogens). We identified that phytoestrogens target genes linked to disrupted cellular homeostasis, e.g. genes limiting DNA break repair (RNF169) or promoting ribosomal biogenesis (rDNA). Existing evidence suggests that DNA methylation may be governed by sirtuin 1 (SIRT1) deacetylase via interactions with DNA methylating enzymes, specifically DNMT3B. Since SIRT1 was reported to be regulated by phytoestrogens, we test whether phytoestrogens suppress genes related to disrupted homeostasis via SIRT1/DNMT3B-mediated transcriptional silencing. Human MCF10A mammary epithelial cells were treated with phytoestrogens, pterostilbene (PTS) or genistein (GEN), followed by analysis of cell growth, DNA methylation, gene expression, and SIRT1/DNMT3B binding. SIRT1 occupancy at the selected phytoestrogen-target genes, RNF169 and rDNA, was accompanied by consistent promoter hypermethylation and gene downregulation in response to GEN, but not PTS. GEN-mediated hypermethylation and SIRT1 binding were linked to a robust DNMT3B enrichment at RNF169 and rDNA promoters. This was not observed in cells exposed to PTS, suggesting a distinct mechanism of action. Although both SIRT1 and DNMT3B bind to RNF169 and rDNA promoters upon GEN, the two proteins do not co-occupy the regions. Depletion of SIRT1 abolishes GEN-mediated decrease in rDNA expression, suggesting SIRT1-dependent epigenetic suppression of rDNA by GEN. These findings enhance our understanding of the role of SIRT1-DNMT3B interplay in epigenetic mechanisms mediating the impact of phytoestrogens on cell biology and cellular homeostasis.

The secretomes of bovine mammary epithelial cell subpopulations differentially modulate macrophage function

Bovine mammosphere-derived epithelial cell (MDEC) cultures are heterogeneous and enriched for stem and progenitor cells. We previously reported that the bovine MDEC secretome, comprised of all bioactive factors secreted by the cells, displays regenerative properties, exerts antimicrobial effects, and modulates neutrophil activity, positioning it as a promising non-antibiotic biologic therapy for infectious diseases important to the dairy industry, like mastitis. Mastitis is defined as inflammation of the udder, and it is typically caused by bacterial infection. The effect of the MDEC secretome on macrophages, a first line of defense against bacterial infections in the udder, is unknown and could impact the utility of the secretome as a therapy for mastitis. To address this, we isolated bovine monocytes from peripheral blood and maintained them as an unpolarized (M0) population or polarized them into M1 or M2 phenotypes. Macrophages cultured with the secretome of bovine MDECs were assessed for their ability to phagocytose labeled bacterial particles and accumulate reactive oxygen species (ROS). We used single-cell RNA sequencing (scRNA-seq) and fluorescence-activated cell sorting (FACS) to isolate a subpopulation of MDECs that exert enhanced effects on macrophages. We found that the secretome of MDECs that do not express cluster of differentiation (CD) 73, a cell surface enzyme used as a marker for mesenchymal stromal cells, most strongly increased macrophage phagocytosis and ROS accumulation. These findings will help optimize the generation of the bovine MDEC secretome as a suitable treatment option for mastitis.

Kaili sour soup in alleviation of hepatic steatosis in rats via lycopene route: an experimental study

BACKGROUND

Nonalcoholic fatty liver disease (NAFLD) is one of the most prevalent chronic liver diseases, with a range of manifestations, such as hepatic steatosis. Our previous study showed that Kaili Sour Soup (KSS) significantly attenuated hepatic steatosis in rats. This study explored the main components of KSS and the mechanisms by which it exerts its protective effects against NAFLD.

METHODS

Twenty-four 6-week-old male Sprague-Dowley (SD) rats were randomly assigned to three treatments: feeding a normal standard diet, a high-fat diet, or a high-fat diet plus gavage KSS. The effects of KSS treatment on hepatic lipid accumulation were assessed using biochemical, histological, and molecular experiments. The amounts of KSS ingredients were measured using biochemical assays. Network pharmacology analyses were performed to identify the hub genes of KSS targets and enriched pathways. CCK-8 assay was used to determine the effect of free fatty acids (FFA), lycopene, and estrogen on HepG2 viability. Quantitative Real-Time polymerase chain reaction (qRT-PCR) and Western blot assays were performed to determine the effect of KSS or lycopene on estrogen signaling and expression of lipid metabolism-related molecules. Statistical analyses were performed using GraphPad Prism and SPSS.

RESULTS

KSS alleviated fat deposition in rat liver tissue and affected the expression of hepatic lipid synthesis, catabolism, and oxidative molecules. Lycopene was identified as the ingredient with the highest amount in KSS. Network pharmacology analyses showed that the hub genes were enriched in the estrogen signaling pathway. Cellular experiments showed that lycopene increased the expression of Estrogen Receptor α (ERα), Carnitine palmitoyltransferase 1 A (CPT1A), Peroxisome proliferator-activated receptor α (PPARα) (all p < 0.01), and Hormone sensitive lipase (HSL) (p < 0.05), and reduced the expression of lipid metabolism-related factors 1c(SREBP-1c) (p < 0.01), Acetyl-CoA carboxylase 1 (ACC) and Lipoprotein lipase (LPL) (all p < 0.05).

CONCLUSIONS

KSS ameliorated abnormal lipid metabolism in patients with NAFLD. Lycopene was the major component of KSS, and it affected estrogen signaling and the expression of lipid metabolism molecules. In short, both KSS and LYC could change lipid metabolism by lowering lipid accumulation and raising lipolysis.

Noncoding function of super enhancer derived Cpox pre-mRNA in modulating neighbouring gene expression and chromatin interactions

Super enhancers are important regulators of gene expression that often overlap with protein-coding genes. However, it is unclear whether the overlapping protein-coding genes and the RNA derived from them contribute to enhancer activity. Using an erythroid-specific super enhancer that overlaps the Cpox gene as a model, Cpox pre-mRNA is found to have a non-coding function in regulating neighbouring protein-coding genes, eRNA expression and TAD interactions. Depletion of Cpox pre-mRNA leads to accumulation of H3K27me3 and release of p300 from the Cpox locus, activating an intra-TAD enhancer and gene expression. Additionally, a head-to-tail interaction between the TAD boundary genes Cpox and Dcbld2 is identified, facilitated by a novel type of repressive loop anchored by p300 and PRC2/H3K27me3. These results uncover a regulatory role for pre-mRNA transcribed within a super enhancer context and provide insight into head-to-tail inter-gene interaction in the regulation of gene expression and oncogene activation.

Long-term yogurt intake and colorectal cancer incidence subclassified by Bifidobacterium abundance in tumor

Evidence suggests a tumor-suppressive effect of the intake of yogurt, which typically contains Bifidobacterium. We hypothesized that long-term yogurt intake might be associated with colorectal cancer incidence differentially by tumor subgroups according to the amount of tissue Bifidobacterium. We utilized the prospective cohort incident-tumor biobank method and resources of two prospective cohort studies. Inverse probability weighted multivariable Cox proportional hazards regression was used to assess differential associations of yogurt intake with the incidence of colorectal carcinomas subclassified by the abundance of tumor tissue Bifidobacterium. During follow-up of 132,056 individuals, we documented 3,079 incident colorectal cancer cases, including 1,121 with available tissue Bifidobacterium data. The association between long-term yogurt intake and colorectal cancer incidence differed by Bifidobacterium abundance (P heterogeneity = 0.0002). Multivariable-adjusted hazard ratios (HRs) (with 95% confidence intervals) in individuals who consumed ≥2 servings/week (vs. <1 serving/month) of yogurt were 0.80 (0.50-1.28) for Bifidobacterium-positive tumor and 1.09 (0.81-1.46) for Bifidobacterium-negative tumor. This differential association was also observed in a subgroup analysis of proximal colon cancer (P heterogeneity = 0.018). Long-term yogurt intake may be differentially associated with the incidence of proximal colon cancer according to Bifidobacterium abundance, suggesting the antitumor effect of yogurt intake on the specific tumor subgroup.

Deuterium stress Reprograms Chlorella sorokiniana Metabolism: Coupling photosynthetic suppression with carbon Reserve Surge

Microalgae convert inorganic substrates into stable isotope-labeled compounds, ideal for deuterated compound production. However, the mechanism by which deuterium affects the growth and metabolism of microalgae remains unclear. This study aims to reveal the effects of deuterium on the growth and metabolic processes of Chlorella sorokiniana and to clarify the interaction between them. After deuterium treatment, cell growth and the accumulation of photosynthetic pigments were significantly inhibited, leading to reduced photosynthetic efficiency and blocked energy transfer. Under 100% D2O conditions, the accumulation of starch and lipids was enhanced, with starch content reaching up to 52% of dry cell weight and lipid content reaching 22%. Transcriptomics revealed deuterium stress inhibited photosynthesis-related genes while upregulating pathways for starch, fatty acid, and nucleic acid synthesis. These findings reveal the adaptation mechanism of microalgae to deuterium treatment and provide valuable insights for the utilization of microalgae in the production of deuterated organic compounds.

Comparative study of organosilicon and inorganic silicon in reducing cadmium accumulation in wheat: Insights into rhizosphere microbial communities and molecular regulation mechanisms

Silicon is widely used as a "quality element" and "stress resistance element" in crop production and the remediation of heavy metal-contamination soils. Compared to inorganic silicon, organosilicon has unique properties such as amphiphilicity, low surface energy and high biocompatibility. Our previous research has confirmed the effectiveness of organosilicon-modified fertilizers in inhibiting Cadmium (Cd) absorption in wheat. Therefore, it is of great importance to further explore the potential mechanisms and comprehensive benefits of organosilicon. In this study, the microbiological and molecular mechanisms by which organosilicon reduces Cd concentration in wheat compared to inorganic silicon were investigated in depth. The findings indicated that, in comparison with inorganic silicon, organosilicon exhibited a more remarkable efficacy. Specifically, it was more effective in reducing the Cd concentration in wheat grains, achieving a reduction range of 35-39 % as opposed to the 23-28 % reduction achieved by inorganic silicon. Moreover, it manifested a greater ability to mitigate health risks, with a reduction range of 33-42 % compared to the 25-30 % reduction of inorganic silicon. Furthermore, organosilicon contributed to a significant increase in wheat yield, with a growth range of 11-14 % in contrast to the 8-11 % increase from inorganic silicon. Additionally, it enhanced the quality of the grains, substantially improving the protein content and amino acid content. The comparative advantages of organosilicon over inorganic silicon would be firstly due to the reduction of the bioavailability of soil Cd by increasing the available silicon content in the soil and improving the soil microbial ecology (increasing the abundance of Bacillus, Pseudomonas, Massilia and Talaromyces and reducing the enrichment of Fusarium). Secondly, organosilicon achieved vacuolar compartmentalization of Cd by upregulating the expression of the ABC transporter gene (TaABCB7), thereby alleviating Cd toxicity and restricting Cd transport from leaves to grains. Meanwhile, organosilicon increased the wheat yield by optimizing the availability of soil nutrients and enhancing photosynthesis. These results demonstrate the immense potential of organosilicon in mitigating heavy metal contamination in crops.

Ovarian toxicity of 2,6-di-tert-butyl-hydroxytoluene on female Ruditapes philippinarum: Reproductive endocrine disruption and oxidative stress

Synthetic phenolic antioxidants (SPAs) are the most widely used antioxidants in the world. There is a growing concern due to their potential toxic effects and high pollution levels in aquatic environments. Existing studies have confirmed the neurotoxic, immunotoxic, and developmental toxicity of SPAs on aquatic organisms. However, there is limited research on the reproductive toxicity of SPAs, particularly in aquatic invertebrates. In this study, female Ruditapes philippinarum were selected as research objects to investigate the reproductive toxicity effects of typical SPAs 2,6-di-tert-butyl hydroxytoluene (BHT) on clams at different reproductive stages. The results showed that BHT downregulated the level of ovarian steroid hormones by disrupting steroid production, and showed anti-estrogenic effects. This interference impedes meiosis, follicular development, and ovulation, resulting in a decrease in the number of mature oocytes and gonadal index. Furthermore, exposure to BHT increased ROS levels and suppressed antioxidant defenses, resulting in biomacromolecular damage. BHT also induced apoptosis, ferroptosis, and pyroptosis in ovarian cells, impairing ovarian development. Collectively, this study elucidates the potential molecular mechanisms of reproductive toxicity caused by BHT in bivalve shellfish, focusing on endocrine disruption, oxidative damage, and cell death pathways. The findings provide data supporting the conservation of marine shellfish germplasm.

DL-alanine promotes the colonization of Pseudomonas aeruginosa and their synergistic enrichment of selenium and decrease of cadmium absorption by Brassica napus

In selenium-rich regions, selenium and cadmium coexist in soil, posing a threat to agricultural product safety. This study explores the influence of Pseudomonas aeruginosa and DL-alanine on selenium and cadmium uptake in Brassica napus. Through pot and medium experiments, along with FTIR and XPS analyses, we found that DL-alanine significantly boosts Pseudomonas aeruginosa biofilm formation and root colonization. Compared with the control group, the combined treatment of DL-alanine and Pseudomonas aeruginosa increased the selenium content in the shoots by 55.8 %, and decreased the cadmium content in the shoots and roots by 66.3 % and 67.9 %, respectively. The direct reason for this result is that the available selenium in the rhizosphere soil increased by 32 % and the available cadmium decreased by 10 %. Further investigation shows that DL-alanine promotes the transformation of Se(0) to Se(-II) and the formation of CdSe nanoparticles by Pseudomonas aeruginosa, which enhances the availability of selenium and reduces that of cadmium. Furthermore, gene expression analysis revealed that the expression levels of selenium-related genes were upregulated, while those of cadmium transport genes were downregulated. This study proposes a new method for improving selenium utilization and reducing cadmium absorption in soils where selenium and cadmium coexist, providing a theoretical basis for safer agricultural practices.

Parishin A alleviates insomnia by regulating hypothalamic-pituitary-adrenal axis homeostasis and directly targeting orexin receptor OX2

Parishin A (PA), a bioactive compound derived from Gastrodia elata Blume, has been used as a herbal remedy for insomnia. Nevertheless, the mechanism underlying the effect of PA on promotion of sleep and its potential targets remain to be elucidated. This study aimed to investigate the potential of PA in ameliorating insomnia, probing into its interactions with the orexin receptor 2 (OX2), antagonists of which are used clinically for the treatment of sleep disorders. We employed an array of methodologies, including in vivo experiments involving the assessment of the impacts of PA on sleep behavior in a p-chlorophenylalanine (PCPA)-induced insomnia mouse model, and the detection of neurotransmitters, inflammatory factors, and hypothalamic-pituitary-adrenal (HPA) axis-related hormones. In vitro experiments, such as extracellular signal-regulated kinase (ERK) 1/2 phosphorylation assay, drug-receptor binding stability assay (DARTS), cellular thermal shift assay (CETSA), solvent-induced protein precipitation (SIP), and molecular docking, were performed to validate the interaction between PA and OX2. The results showed that PA relieved insomnia in mice by effectively increasing the content of 5-hydroxytryptamine (5-HT) while reducing those of dopamine (DA), norepinephrine (NE) and glutamine/γ-aminobutyric acid (Glu/GABA), as well as the inflammatory factor tumor necrosis factor-alpha (TNF-α) in the hypothalamus. PA also improved the morphological changes in the hippocampus of insomnia mice and decreased the levels of HPA axis-related hormones. Furthermore, OX2 was found to be a potential direct target of PA. In conclusion, PA might be an antagonist of OX2 because of its ability to inhibit OX2-induced ERK 1/2 activation. These findings provide valuable insights into the therapeutic potential of PA in insomnia.

Hypoxia-inducible factor-1α involves in regulating anti-lipopolysaccharide factors expression via NF-κB under hypoxia stress in Chinese mitten crab (Eriocheir sinensis)

Oxygen is essential for the survival of organisms. Hypoxia profoundly affects the immune response in aquatic crustaceans, nevertheless, the precise mechanisms of immunological regulation under hypoxic conditions remain unclear. Hypoxia-inducible factor 1-alpha (HIF-1α), a key regulator of oxygen homeostasis, also plays a vital role in the immunological responses of mammals. Nonetheless, it remains uncertain whether HIF-1α regulates the immune response of crustaceans under hypoxia stress. This study investigated the expression patterns of EsHIF-1α and anti-lipopolysaccharide factors (ALFs) in response to Aeromonas hydrophila stimulation under hypoxia stress in Eriocheir sinensis. The mRNA expression levels of EsHIF-1α in haemocytes were significantly increased after hypoxia treatment, while were markedly reduced following A. hydrophila stimulation under hypoxic condition. Similarly, the EsALFs mRNA expression levels were also significantly decreased post A. hydrophila injection under hypoxic condition. Subsequently, the effect of EsHIF-1α on EsALFs mRNA expression was detected. The mRNA transcripts of EsALFs significantly diminished in HIF-1α inhibitor (KC7F2) injected crabs, however, a significant increase was observed in HIF-1α activator (IOX4) injected crabs. Furthermore, the mRNA expression and phosphorylation levels of NF-κB exhibited a similar trend following the inhibition or activation of EsHIF-1α, indicating that EsHIF-1α has a positive effect on the expression and activity of NF-κB. In addition, the bacterial clearance of haemolymph in the HIF-1α activated group was significantly higher, whereas in the HIF-1α inhibited group it was significantly lower, compared to the control group. Our findings collectively suggested that EsHIF-1α regulated ALFs expression through NF-κB activation in E. sinensis in response to A. hydrophila stimulation under hypoxic conditions. This research improves the understanding of the immunological regulation mechanisms in crustaceans under hypoxia stress.

Role of UBC9 in the inflammatory response and pathogen susceptibility in zebrafish

UBC9 is a key enzyme involved in SUMOylation, a post-translational modification that targets protein function, stability, transcriptional regulation, and localization to affect biological processes in host cells. Pathogens often target UBC9 by exploiting the host's SUMO system to modify their proteins with altered functionality, which in turn favors the pathogens' survival or invasion. Herein, we investigated the critical role of UBC9 in regulating the inflammatory response and susceptibility to Mycobacterium marinum (Mm) infection in zebrafish. We effectively knocked down the UBC9 expression using morpholino antisense oligonucleotides, which showed significant developmental abnormalities in zebrafish, particularly in cartilage formation. Our results indicated that UBC9 is essential for immune cell migration, as its knockdown led to impaired macrophage and neutrophil responses during inflammation. Furthermore, we investigated the impact of UBC9 on the zebrafish response to Mm, a close relative of the tuberculosis-causing bacterium. Our results showed that UBC9-knocked-down zebrafish displayed a slight increase in bacterial proliferation, suggesting a potential role of UBC9 in host's ability to control pathogen replication and spread. The study explores the complex interplay between UBC9 and the immune system and provides insights into the important role of UBC9 in immune regulation and pathogen defence.

Differential regulation of GABAA receptor-mediated hyperexcitability at different stages of brain development in focal cortical dysplasia (FCD)

Focal cortical dysplasia (FCD) is a developmental abnormality of cortex commonly linked with drug-resistant seizures. Altered GABAergic activity is a key contributor to interictal discharges in FCD. In FCD, GABAA receptor associated epileptogenicity is dependent upon the age at seizure onset, as differential epileptogenic networks are observed in early and late onset FCD patients. But the contribution of GABAA receptor alteration to epileptogenic networks during development is unclear. We hypothesize that GABAergic signaling in FCD undergoes age-dependent molecular alterations, contributing to the development of distinct epileptogenic networks. In this study, we investigated age-dependent changes in GABA neurotransmitter levels, GABAA receptor α subunit expression, and GABAA receptor-mediated synaptic activity using the BCNU-rat model of FCD. GABA levels, mRNA, and protein expression of GABAA receptor α subunits were determined by HPLC, qPCR and western blot and spontaneous GABAergic activity from pyramidal neurons was recorded using whole cell patch-clamp technique. At postnatal days (P) 12 and 21, reduced expression of α1, 2 and 4 subunits were observed in FCD rats compared to control. Consistent with this, decreased amplitude and frequency of GABAergic events were observed in FCD rats. In contrast, at P30 and P65, decreased GABA levels, without changes in receptor expression, were observed in FCD rats. Consistently, reduction in the frequency of GABAergic events was observed in FCD rats compared to the control. Furthermore, treatment with tetrodotoxin (TTX) revealed that the observed alterations in GABAergic activity were predominantly action potential (AP)-dependent. Our findings indicate that distinct epileptogenic networks exist in FCD during early and late developmental stages. These networks are driven primarily by altered GABAergic activity, with early age changes linked to aberrant GABAA receptor configurations and late age changes associated with abnormal GABA levels.

Light and chloroplast redox state modulate the progression of tobacco leaf infection by Pseudomonas syringae pv tabaci

Light influences plant stress responses, with chloroplasts playing a pivotal role as both energy providers and light sensors. They communicate with the nucleus through multiple retrograde signals, including secondary metabolites and reactive oxygen species (ROS). To investigate the contribution of chloroplast redox biochemistry during biotic interactions, we studied the response of tobacco leaves expressing the alternative electron shuttle flavodoxin to Pseudomonas syringae pathovars displaying different types of plant-pathogen interactions under light and dark conditions. Flavodoxin is reported to limit light-dependent ROS propagation and over-reduction of the photosynthetic electron transport system under stress. Light intensified localized cell death (LCD) in response to the incompatible pathovar tomato (Pto), but slowed disease progression caused by infective pathovar tabaci (Pta). Flavodoxin mitigated light responses during both interactions, including decreased ROS levels, reduced stromule occurrence, and lower phytoalexin production. Similar metabolic profiles were observed in the dark for both strains, with a general up-regulation of sugars, metabolic intermediates, and amino acids. In the light, instead, Pta increased hexoses and intermediates, while Pto decreased them. The results suggest that LCD-like lesions are elicited in the light even during virulent interactions, and that light effects are related to signals originating from the photosynthetic machinery.

Impacts of disinfection methods in a granular activated carbon (GAC) treatment system on disinfected drinking water toxicity

The efficacy of implementing granular activated carbon (GAC) treatment in combination with pre- or post-chlorination for mitigating disinfection byproducts (DBPs) in drinking water has been promising, yet its impact on water toxicity remains unclear, necessitating cost-effective and informative effect-based toxicity assessment. This study, using recently developed yeast toxicogenomic and human cell RT-qPCR assays targeting DNA and oxidative stress, compares the toxicity level and nature of water treated through a pilot-scale GAC system with post-chlorination (GAC/Cl2) or pre-chlorination upstream of GAC (Cl2/GAC/Cl2), with water treated by chloramination (Cl2/NH2Cl). Experiments were conducted at environmentally relevant bromide and iodide levels across three GAC beds. The post-chlorination with GAC generally reduces genotoxicity and oxidative stress more effectively than Cl2/NH2Cl or Cl2 treatment at ambient halide concentrations. However, pre-chlorination with GAC was inconsistent in lowering the effluent toxicity in comparison to the post-chlorination-GAC treatment, especially at high halide levels, where no toxicity reduction was observed compared to non-GAC-treated water. Correlation analysis of detected DBPs and toxicity quantifiers, along with maximum cumulative ratio analysis identifies top DBPs that contribute to the toxicity and their cumulative risks, pointing the iodinated DBPs (I-DBPs) and nitrogenous DBPs (N-DBPs) as the significant contributors to DNA and oxidative stress. The results highlight that unregulated DBPs play a critical role in water toxicity, and whole water toxicity monitoring in complement to regulated DBPs detection is needed for treatment strategies efficacy assessment to address unregulated DBPs and their health risks.

Unveiling the potential of xanthines, discovery of potential 7-benzyl-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione derivatives with antifibrotic activity for liver injury

A new series of xanthine-based derivatives were designed, synthesized, and investigated to achieve promising antifibrotic and antioxidant agents for management of liver injury. Structure-based optimizations of the methylxanthine-based KMUP-1 (IX) were performed for inhibiting NF-κB activation pathway. All the newly designed xanthine derivatives 3, 4, 5, 6a-d, 7a-d, and 9a-d were in vitro screened for the antioxidant activity using the DPPH method. Compounds 4 and 5 showed the highest antioxidant activity with an IC50 of 28.02 and 36.02 μM, respectively. Compounds 9c and 9d retained a promising interception of the NF-κB activation pathway in molecular docking simulations within I-κB kinase α (IKKα) crystal structure (PDB ID: 5EBZ). Subsequently, compounds 9c and 9d were evaluated for their in vivo antifibrotic and chemoprotective activity using CCl4-induced hepatic fibrosis rat model. Compounds 9c and 9d successfully ameliorated liver fibrosis, as evidenced by the improved liver histopathological examination and liver enzyme activity levels. Compounds 9c and 9d were evaluated for their effects on mRNA expression levels of key genes involved in liver fibrosis via real-time PCR assays. Compound 9c exhibited a greater inhibitory effect on the expression levels of NF-κB and HIF-1α and a more pronounced stimulation of Nrf2 than compound 9d. Moreover, all the new xanthine derivatives were screened for the cytotoxic activity against the NCI tumor cell lines. Compounds 9c and 9d revealed a non-significant cytotoxic activity against all the assayed tumor cell lines, which indicate their selectivity for the antifibrotic activity. While compounds 6a and 6c displayed promising selective activity against melanoma SK-MEL-5 cell line (GI = 125.6, 90.3 %, respectively), and breast T-47D cell line (GI =87.8, 80.6 %, respectively). The utilized design approach unveiled the versatility of xanthine scaffold to deliver potential antioxidant, liver antifibrotic and chemoprotective agents, along with anticancer candidates via structure modification and optimization.

Vortioxetine attenuates rotenone-induced enteric neuroinflammation via modulation of the TLR2/S100B/RAGE signaling pathway in a rat model of Parkinson's disease

Emerging evidence suggests that gastrointestinal dysfunction and enteric nervous system pathology play a critical role in the early stages of Parkinson's disease. Considering the bidirectional relationship between gastrointestinal symptoms and mood disorders, this study aimed to elucidate the effects and possible mechanisms of action of vortioxetine, a serotonergic antidepressant, on the pathophysiological changes induced by rotenone in the enteroglial cells. α-synuclein, phosphorylated α-synuclein, TLR2, S100B and RAGE expression were detected in duodenal tissues of rats administered rotenone (2 mg/kg/day, s.c.) and/or vortioxetine (10 mg/kg/day, s.c.) for 28 days. For the mechanism of action studies, rat-derived enteroglial cells were treated with rotenone (10 μM) and/or vortioxetine (5 μM or 1 μM) for 24 h. The effects of vortioxetine were evaluated in the presence of the TLR2 antagonist C29, RAGE antagonist FPS-ZM1 and the S100B inhibitor pentamidine. TLR2, S100B, RAGE, and NFκB mRNA levels and proinflammatory cytokines via RT-qPCR and ELISA. Our results demonstrate that rotenone treatment significantly increased α-synuclein, pS129-α-synuclein, TLR2, and S100B expression while reducing RAGE levels, indicating marked enteric pathology. Vortioxetine administration attenuated these effects, reducing α-synuclein accumulation and proinflammatory markers. In vitro, rotenone impaired glial responses, decreasing S100B, RAGE, and NFκB markers, while vortioxetine improved these responses, promoting resynthesis of inflammatory molecules. Notably, S100B, NFκB, and cytokine levels (TNF-α, IL-1β, IL-6) were affected by C29, FPS-ZM1, and pentamidine pretreatments. Thus, vortioxetine is thought to have beneficial effects on rotenone-induced pathological changes in EGCs, and some of these effects are thought to be mediated by the TLR2/S100B/RAGE pathway.

Development of a highly sensitive, high-throughput and automated CRISPR-based device for the contamination-free pathogen detection

Rapid, portable, and contamination-resistant nucleic acid detection methods are necessary due to the threat posed by emerging viruses to public health and agricultural output. We establish CARE (CRISPR-associated airtight real-time electronic diagnostic device), a novel platform that combines CRISPR-Cas12a with a hermetically sealed microfluidic chip to overcome the limitations of present technologies, which struggle to balance sensitivity, multiplexing, and field applicability. By combining isothermal amplification and CRISPR detection within a hermetically sealed microfluidic chip, CARE eliminates the risk of nucleic acid aerosol contamination while enabling simultaneous high-throughput analysis of seven pathogens. The device is complemented by a user-friendly nucleic acid quantification App, enabling rapid and precise analysis. The RPA-CRISPR/Cas12a system demonstrates exceptional sensitivity, detecting as few as 1 copy μL-1 (single-plex) and 10-102 copies μL-1 (multiplexed), with real-sample performance matching gold-standard methods. CARE represents a significant advancement in CRISPR-based diagnostics, offering a robust, portable solution for on-site pathogen detection in food and agricultural applications.

TGFBI R124H mutant allele silencing in granular corneal dystrophy type 2 using topical siRNA delivery

In recent years, success has been achieved in treating several eye conditions with oligonucleotide-based therapies. Herein, we outline the experimentation involved in progressing selection and development of a lead therapeutic siRNA for R124H mutation of TGFBI gene which causes Granular Corneal Dystrophy Type 2 (GCD2/Avellino CD). Firstly, a series of siRNA designs, generated by a gene walk across the R124H TGFBI mutation site, were tested and a lead siRNA identified. The lead siRNA was delivered into an immortalised human corneal epithelial cell line to assess on-target efficacy and off-target effects. The in vivo efficacy of the lead R124H TGFBI siRNA, complexed with Bio-Courier technology, silicon stabilized hybrid lipid nanoparticles (sshLNP), was assessed in a mouse model of GCD2 which expressed the human R124H TGFBI transgene. Following topical siRNA application for 5 consecutive days, expression of the R124H mutant TGFBI transgene was measured and shown to be reduced by 22.4 % (± 15.7 %, p < 0.05). We investigated gene expression in the mouse cornea and showed expression of murine Tgfbi was 20-fold lower than TGFBI in human cornea, and expression of the mutant TGFBI transgene was a further 3-fold lower. This estimated 60-fold lower mutant transgene expression may explain the low frequency of corneal deposits observed in this mouse model, limiting its usefulness to test whether siRNA silencing is capable of phenotypic improvement or regression of GCD2/Avellino corneal dystrophy. We assessed WT TGFBI silencing in human primary corneal epithelial cells (PCEC) derived from human corneal limbal biopsy material, which express TGFBI at a similar level to human corneal biopsy. We demonstrated that a single 100 nM siRNA treatment, delivered by the sshLNP to the primary human corneal epithelial cells, gave 26.6 % (± 6.6 %, p < 0.001) reduction in TGFBI mRNA and a 15.4 % (±10.5 %, p < 0.05 %) reduction in TGFBi protein after 48 h. In consideration of the mutant gene expression levels in existing models of GCD2 disease, an ex vivo model of mutation-expressing primary corneal epithelial cells generated from corneal limbal biopsies from GCD2 patients would be more suitable than existing transgenic mouse models for future pre-clinical work in the development of gene silencing therapies for corneal dystrophies.

FUBP3 enhances HIV-1 transcriptional activity and regulates immune response pathways in T cells

Far-upstream element-binding protein 3 (FUBP3) was identified at actively transcribing HIV promoters through chromatin affinity purification and mass spectrometry. Known for regulating cellular processes such as transcription and translation by binding to DNAs and RNAs, FUBP3's role in HIV transcriptional regulation was previously unrecognized. This study reveals that FUBP3 enhances HIV-1 transcriptional activation by interacting with Tat and trans-activation response (TAR)-RNA, critical for boosting viral transcription through recruitment of activating factors that promote RNA polymerase II (RNAPII) elongation. Transcriptomic analysis, chromatin immunoprecipitation, and biochemical assays demonstrated that FUBP3 associates with and stabilizes TAR-RNA, in a Tat-dependent manner, and enhances Tat steady-state levels via interaction with Tat's basic domain. Suppressing FUBP3 decreased HIV-1 transcription and altered expression of host genes linked to T cell activation and inflammation, underscoring its broad regulatory impact. Additionally, FUBP3 was enriched at active promoters, confirming its role in transcriptional regulation at specific genomic locations. These findings highlight FUBP3's critical role in the HIV-1 life cycle and suggest its potential as a therapeutic target in HIV-1 infection. Additionally, this study expands our understanding of FUBP3's functions in oncogenic and inflammatory pathways.

Transcription factors FOXN1 and intrathymic cytokines contribute to dysfunction of TECs during lipopolysaccharide-induced thymic atrophy

Sepsis is a major cause of mortality in neonates, yet understanding of sepsis-associated immune dysregulation in early life remains limited. Sepsis-induced thymus atrophy results in disruption of T cell development, accompanied by the dysfunction of thymic epithelial cells (TECs). Here, we sought to identify molecular mechanisms underlying TECs dysfunction while induced sepsis in neonatal mice and immortalized TECs cell line (iTECs) via lipopolysaccharide (LPS) treatment. We identified that LPS induced a reduction in thymocytes number starting at the double-negative stage of thymocyte development and significantly reduced numbers of naïve T cells and recent thymic emigrants (RTEs). Further we confirmed the alterations of intrathymic cytokines influencing T cell development and functionality through the FOXN1 signaling pathway upon exposure to LPS ex vivo and in vivo. LPS treatment decreased the number of cortical TECs (cTECs) and medullary TECs (mTECs) by enhancing the apoptosis of cTECs and decreasing the proliferation of mTECs. These findings provide valuable insights for further study on the innate and specific immunity in response to neonatal sepsis.

Unveiling the mechanisms of mechanical loading-induced knee osteoarthritis through transcriptomics

AIMS

To establish a novel model of mechanical loading-induced knee osteoarthritis (KOA) and explore its regulatory mechanisms through transcriptomics.

METHODS

Knee joints of Sprague-Dawley (SD) rats were mechanically loaded with 13 N, 20 N and 27 N for 2 or 4 weeks to construct mechanically-induced KOA model. Immunohistochemistry (IHC), quantitative real-time polymerase chain reaction (qRT-PCR), Western blot, Safranin O/fast green staining, enzyme-linked immunosorbent assay (ELISA), micro-computed tomography (Micro-CT) and behavioral analysis were used to evaluate damage on the right knee joint. Transcriptomic analysis combined with validation experiments were performed to explore the regulatory mechanism of excessive mechanical loading on KOA development.

RESULTS

A vertical load of 27 N resulted in calf fractures, whereas a 13 N load did not cause remarkable pathological alteration in the knee joint. Notably, applying compression at a load of 20 N for 4 weeks (w) significantly promoted the levels of pro-inflammatory factors IL-6, IL-β, NLRP3, iNOS and TNF-α in serum and joint fluids and markedly minimized the levels of anti-inflammatory factors IL-10 and TGF-β. Immunohistochemistry, qRT-PCR and Western blot analyses suggested that the 20 N load reduced the expression of anabolism markers (ACAN and COL2A1) and escalated the expression of catabolism markers (MMP13 and ADAMTS4). KEGG analysis and validation results showed that PIEZO1-Ca2+ signaling pathway, PI3K-AKT signaling pathway and NF-κB signaling pathway were significantly activated in the 20 N-4 w group.

CONCLUSION

Continuous loading with 20 N for 4 weeks can induce significant OA-like damage to the cartilage of the right knee in rats, which might be induced through the PIEZO1-Ca2+/PI3K-AKT/NF-κB signaling pathway.

miR-210 overexpression increases pressure overload-induced cardiac fibrosis

Aortic stenosis, a common valvular heart disease, can lead to left ventricular pressure overload, triggering pro-fibrotic responses in the heart. miR-210 is a microRNA that responds to hypoxia and ischemia and plays a role in immune regulation and in cardiac remodeling upon myocardial infarction. This study investigated the effects of miR-210 on cardiac fibrosis caused by pressure overload. Using a mouse model with inducible miR-210 over-expression, we subjected mice to transverse aortic constriction (TAC) to induce pressure overload. Mice with miR-210 over-expression developed eccentric hypertrophy, heightened expression of hypertrophic markers (Nppa and Nppb) and increased cross sectional area of cardiomyocytes, impacting the free wall of the left ventricle. These findings suggest that miR-210 worsens cardiac dysfunction. Furthermore, miR-210 over-expression led to a more robust and sustained inflammatory response in the heart, increased interstitial and perivascular fibrosis, and activation of myofibroblasts. miR-210 also promoted angiogenesis. In vitro, cardiac fibroblasts over-expressing miR-210 showed increased adhesion, wound healing and migration capacity. Our results demonstrate that miR-210 contributes to adverse cardiac remodeling in response to pressure overload, including eccentric hypertrophy, inflammation, and fibrosis.

Deciphering the CREB-NR2B axis: Unraveling the crosstalk of insulin and TGF-β signalling in ameliorating postoperative cognitive dysfunction

Postoperative cognitive dysfunction (POCD) is a significant postoperative complication, particularly in the elderly, linked to inflammation-mediated neural dysfunction. Insulin resistance and disruptions in transforming growth factor beta (TGF-β) signalling are associated with cognitive decline in aging, yet their roles in POCD are not fully understood. Here, we demonstrated that both insulin and TGF-β pathways were disrupted in POCD mouse models, with recombinant insulin and TGF-β treatments improving cognitive outcomes. These treatments reversed neuroinflammation in vitro, while CREB knockdown abrogated the protective effects, both in vivo and in vitro. Mechanistically, CREB was found to mediate the protective effects of insulin and TGF-β in POCD by directly regulating the expression of the cognitive-related protein NR2B. Altogether, our study identifies a key molecular target involved in the critical signalling pathways associated with POCD, offering promising therapeutic strategies for prevention and treatment.

Fish are poor sentinels for surveillance of riverine antimicrobial resistance

Effective surveillance of antimicrobial resistance (AMR) in the environment is crucial for assessing the human and animal health risk of AMR pollution. Wastewater treatment plants (WWTPs) are one of the main sources of AMR pollutants discharged into water bodies. One important factor for assessing the risks associated with such pollution is the colonization potential of the resistant bacteria (ARB) and resistance genes (ARGs) from the environment into human or animal microbiomes upon exposure. This study explores whether fish can act as sentinels for surveillance of AMR pollution in general and specifically the human colonization potential of ARB in rivers impacted by WWTP effluents. Two riverine fish species, Brown trout, and European bullhead, were sampled up- and downstream a German WWTP. The two fish species were chosen due to their different lifestyles: Trout are mainly actively swimming in the water phase, while bullheads are sedentary and river sediment-associated. The bacterial microbiomes and resistomes of fish gills, skin, and feces were compared with those of the respective river water and sediment up- and downstream of the WWTP. Microbiomes of both fish mirrored the changes in river water and sediment downstream of the WWTP, with significant shifts in bacterial community composition, particularly an increase in Proteobacteria and Verrucomicrobia. However, increases in ARG abundances observed in water and sediment downstream of the WWTP were not reflected in any of the fish-associated resistomes. This indicates that while the fish microbiome is sensitive to environmental changes, resistomes of poikilothermic animals such as fish are less responsive to colonization by ARB originating from WWTPs and may not serve as effective sentinels for assessing AMR pollution and colonization risks in freshwater environments. This study highlights the complexity of using wildlife as indicators for environmental AMR pollution and suggests that other species are better suited for surveillance efforts.

PbMADS49 Regulates Lignification During Stone Cell Development in 'Dangshansuli' (Pyrus bretschneideri) Fruit

Lignified stone cell content is one of the critical factors affecting 'Dangshansuli' fruit quality. The function of MADS-box transcription factors in regulating lignin biosynthesis in pear fruit is still less. In this study, PbMADS49 gene silencing inhibited the lignin biosynthesis and stone cell secondary wall development of pear fruit mainly through reducing the expression levels of lignin monomer polymerisation key enzymes (PbPRX33 and PbPRX45). PbMADS49 was a transcriptional repressor inhibiting its transcription by binding to the CArG element in the target gene promoter. Combined with the co-expression network and promoter cis-acting element analysis, we hypothesised that PbMADS49 positively regulates the transcription of PbPRX33 through PbWRKY63. The gene silencing effect of homologous genes PbPRX33-1 and PbPRX33-2 was consistent with PbMADS49, and PbPRX33-2 was more significant than PbPRX33-1. This study shows that PbMADS49 is a positive regulator of stone cell lignification, providing new insights into the development mechanism of pear stone cells.

Selection and validation of reference genes for quantitative real-time PCR analysis across tissues at different developmental stages in Taraxacum kok-saghyz

Quantitative real-time polymerase chain reaction (qRT-PCR) is a highly sensitive and widely used method for analyzing gene expression profiles. Accurate qRT-PCR normalization requires the identification of stable reference genes under specific experimental conditions. Although seven reference genes have been used in Taraxacum kok-saghyz (TKS), an alternative natural rubber-producing crop, a systematic identification of reliable internal references for gene expression analysis across tissues at distinct developmental stages of TKS has not been conducted. In this study, we screened 12 candidate reference genes (CRGs) based on RNA-seq data from 26 TKS samples, representing five tissue types and nine developmental stages. The expression levels of the 12 CRGs, along with 7 previously reported reference genes (RRGs), were quantified by qRT-PCR across various tissues and developmental stages. The expression stability of the 19 genes was further evaluated by four commonly used algorithms (geNorm, NormFinder, comparative delta Ct, and BestKeeper), and their results were integrated by RefFinder to generate a comprehensive stability ranking. The final results revealed that TkADF1 and TkRPT6A were the most suitable internal control genes for the all-tissue group and leaf samples. TkUPL and TkSIZ1 were found to be optimal for root samples, while TkADF1 and TkSRPRA were preferred choices for latex samples. Moreover, validation using two rubber biosynthesis-related genes (TkFPS1 and TkSRPP2) confirmed the reliability of these recommended genes, showing a strong positive correlation with the RNA-seq data. This study provides reliable reference genes for qRT-PCR normalization in TKS, facilitating future research on developmental regulation and natural rubber biosynthesis.

Classification and Prognostication of B-Cell and T-Cell Multicentric Lymphoma in Dogs Using Serum MicroRNAs

Canine multicentric lymphoma is a common malignancy in dogs. It often responds well to initial chemotherapy but frequently relapses and has a poor response to subsequent treatment. B-cell (BCL) and T-cell (TCL) lymphomas differ in both their prognoses and chemotherapeutic treatment protocols. Currently, immunophenotyping can be costly and can only be performed on specific high-quality samples. MicroRNAs (miRNAs) are small molecules present in blood and tissues and are dysregulated in both human and canine lymphoma. We investigated 59 miRNAs by RT-qPCR to establish a serum miRNA profile in dogs with B-cell and T-cell multicentric lymphoma. Multiple miRNA pruned decision tree models were used to classify BCL and TCL cases from each other and controls, and to predict prognosis in BCL cases receiving standard CHOP chemotherapy. Six individual miRNAs were differentially expressed in serum between BCL and controls, and three were differentially expressed between BCL and TCL. A three-miRNA model (miR-155-5p, miR-1 and miR-181b) could differentiate between BCL, TCL and control samples with an accuracy of 83.02%. A three-miRNA model (miR-125b-5p, miR-350 and let-7b-5p) in BCL samples separated the cases into four groups with hazard ratios ranging from 0.44 to 3.5 for overall survival. This study established a serum miRNA profile for both BCL and TCL and demonstrated the utility of multiple serum miRNA models to assist in the diagnosis of lymphoma and BCL prognostication.

Gracilaria edulis-mediated silver nanoparticles as a targeted strategy for cervical cancer with integrated toxicity evaluation in zebrafish

Cervical cancer remains a critical global health concern, demanding the development of innovative therapies to address the limitations of conventional chemotherapeutics, including systemic toxicity and lack of specificity. Silver nanoparticles synthesized using Gracilaria edulis (GE-AgNPs) present a novel therapeutic strategy, exhibiting selective cytotoxicity against the HEK293 normal epithelial cell line and HeLa cervical cancer cell line. Phytochemical analysis of Gracilaria edulis identified bioactive compounds such as 4-Benzaldehyde and 1H-1,3-Benzimidazole-1-acetonitrile, both associated with potent anticancer activities. Comprehensive characterization of GE-AgNPs through spectroscopy and microscopy revealed distinctive physicochemical properties, including an absorption peak at 332 nm and a hexagonal crystalline structure. Cytotoxicity assays confirmed that GE-AgNPs induce apoptosis in HeLa cells exhibit a concentration-dependent response, with an IC50 value of 54.05 μg/mL, while GE-AgNPs exhibited no significant toxicity to HEK293 cells at the tested concentrations, as evidenced by a higher IC50 value of 83.6 μg/mL. The pro-apoptotic effect was mediated through the development of reactive oxygen species (ROS), validated using dual staining and Hoechst assays, which demonstrated chromatin condensation indicative of apoptosis. Molecular analysis further elucidated the mechanism of action, highlighting significant inhibition of the PI3K/AKT signaling pathway. This was evidenced by downregulation of PI3K, AKT, and mTOR genes alongside the upregulation of PTEN, a critical tumor suppressor. Zebrafish embryo toxicity assays provided insights into the biocompatibility of GE-AgNPs, revealing low toxicity at therapeutic concentrations but developmental abnormalities and neurotoxicity at higher doses. These findings underscore the promise of GE-AgNPs as a targeted therapy option for cervical cancer, effectively modulating the PI3K/AKT pathway while maintaining manageable toxicity profiles. Further investigations into optimizing dosing regimens and exploring synergistic effects with existing treatments could enhance their clinical applicability.

High levels of sinigrin trigger synthesis of fatty acids in Plutella xylostella (L.)

Diamondback moth (Lepidoptera: Plutellidae; Plutella xylostella L.) is a specialist insect of the Brassicaceae family, damaging economically important crops, such as cabbage and cauliflower. Glucosinolates, also known as 'mustard oil bombs' are present in all Brassicaceae members, of which sinigrin (allyl-glucosinolate or 2-propenyl-glucosinolate) is a major aliphatic compound. During herbivory, glucosinolates are converted to toxic isothiocyanates that deter insect pests. P. xylostella possesses glucosinolate sulfatases that desulfate them. Such a conversion renders them unfit for degradation to toxic products. Changes in the larval performance prompted us for RNA sequencing to understand probable adaptation mechanism under sinigrin stress. Differentially expressed genes were found to be related to larval cuticle proteins. Further, gene ontology and KEGG (Kyoto Encyclopedia of Genes and Genomes) analyses depict genes belonging to the categories, integral component of membrane, cellular processes and those involved in biosynthesis of fatty acids. Upregulation of cuticular genes viz. larval cuticle protein-17 (LCP-17), cuticular protein-19 (2CP-19) and ATP binding cassette transporter C7 (ABCC7), ABCC16 was validated by qRT-PCR. Liquid chromatography quadrupole time of flight mass spectrometry analysis of whole larvae feeding on sinigrin and their separated cuticle, depicted abundance of fatty acids. Changes in the topography of the larval cuticle were evident by scanning electron microscopy. Expression of PxABCH1 was corroborated to its role in the transport of cuticular lipids. Notably, molecular docking of PxABCH1 with cuticular fatty acids showed favorable binding interactions. To summarize, integrated transcriptomic and metabolomic analyses suggest that in response to a diet containing a high dose of sinigrin, P. xylostella re-programs metabolic pathways related to fatty acid biosynthesis that directly influence insect development.

RNA‑seq analysis of predictive markers associated with glutamine metabolism in thyroid cancer

The incidence of thyroid cancer (TC) increases year by year. It is necessary to construct a prognostic model for risk stratification and management of TC patients. Glutamine metabolism is essential for tumor progression and the tumor microenvironment. The present study aimed to develop a predictive model for TC using a glutamine metabolism gene set. Differentially expressed genes in cells with high glutamine metabolism levels from single cell RNA‑sequencing data were compared with genes differentially expressed between normal and TC tissues from The Cancer Genome Atlas Program data. Through Boruta feature selection methods and multivariate Cox regression, six crucial genes were identified for a risk‑scoring system to develop a prognostic model. The role of each gene was verified in TC cells in vitro. A risk‑scoring system was developed according to the glutamine gene set to forecast the overall survival of TC patients. This risk score could stratify TC patients and minimize unnecessary surgeries and invasive treatments. In addition, signal induced proliferation associated 1 like 2 (SIPA1L2), an important gene in the prognostic model, knockdown in TPC‑1 and BCPAP cell lines enhanced TC cell proliferation, migration and invasion. A risk model was developed based on a glutamine metabolism gene set. The model has reference values for TC stratification.

Peritubular myoid cells of the testis produce monocyte chemotactic protein 1 upon direct exposure to Mono-(2-Ethylhexyl) phthalate through the IL-1 signaling pathway

Mono-(2-ethylhexyl) phthalate (MEHP) is a metabolite of the diester parent compound Di(2-ethylhexyl) phthalate (DEHP), a widespread environmental toxicant known for its harmful effects on Sertoli cells and the subsequent loss of germ cells through apoptosis in postnatal animals. Peritubular myoid cells (PTMCs) produce various signaling factors, including the chemokine monocyte chemotactic protein 1 (MCP-1); however, the MEHP exposure-induced BTB disruption followed by MCP-1 secretion by PTMCs, the recruitment, and activation of macrophages as well as molecular mechanisms that initiate the secretion in the testis has yet to be closely examined. In this study, we demonstrate for the first time that PTMCs generate MCP-1 via the interleukin-1 signaling pathway upon MEHP exposure. Primary PTMCs isolated from the testis of peripubertal rats were cultured and exposed to 100 μM and 200 µM MEHP. Total RNA was used for bulk RNA sequencing, qRT-PCR, and protein lysates for proteomic analysis. Testis and their interstitial fluid (IF) were obtained from MEHP-exposed animals to evaluate the levels of pro-inflammatory cytokines and chemokines in IF through a multiplex assay and in tissue sections through immunofluorescence studies. The RNA sequencing data show significant enrichment of the interleukin-1 signaling pathway after MEHP (200 µM) exposure for 48 hours. This finding is further supported by the qRT-PCR results for select genes associated with the IL-1 signaling pathway, highlighting the crucial role of this pathway in the response of PTMCs to MEHP exposure. In summary, MEHP exposure stimulates MCP-1 production by PTMCs, and mechanistically, the IL-1 signal transduction pathway governs this response. Keywords: MCP-1, PTMCs, Rats, Testis, Chemokine, IL-1 signaling.

Laser microdissection and fluorescence in situ hybridization reveal the tissue-specific gene expression in the ovules of P. tabulaeformis Carr

Ovules are important carriers for seed plant reproduction, and ovules of gymnosperms are composed mainly of female gametophyte (FG) and adjacent diploid tissue (ADT). To investigate tissue-specific genes in the ovules of Pinus tabulaeformis Carr., we used laser microdissection (LMD) to separate FGs and ADTs, and performed linear amplification to construct cDNA libraries, obtaining a total of 156 expressed sequence tags (EST). Furthermore, some differentially expressed genes between FG and ADT of P. tabulaeformis ovule were screened by the analysis of EST. In addition, the expression levels of key genes in fertile line (FL) and sterile line (SL) ovules during development were verified by RT-qPCR, and we found that both PtRPL7a and PtDHN4 were more highly expressed in FL in each period (at least 1.7 times that of SL). Finally, fluorescence in situ hybridization (FISH) was used to reveal the temporal and spatial expression patterns of PtRPL7a and PtDHN4 in the ovules of P. tabuliformis during ovule development between FL and SL. Our results indicate that the expression levels and the locations of PtRPL7a and PtDHN4 show significant differences in different tissues during ovule development between FL and SL. This study further elucidates the molecular mechanism of the ovule abortion of P. tabulaeformis and provides a theoretical basis for the germplasm optimization of gymnosperms.

Purslane leaf powder dietary supplementation rescues cadmium-induced disruption of behavior, antioxidant status, and expression of tight junction genes, in the brain of Nile tilapia (Oreochromis niloticus)

This study examined the effects of supplementing the Nile tilapia (Oreochromis niloticus) diet with purslane (Portulaca oleracea L.) leaf powder (PLNP, 10 g/kg) on neurobehavioral performance, brain oxidative status, tight junction mRNA expression, and brain histology in fish exposed to waterborne cadmium (Cd, 50 μg /L) for 60 days. Adding PLNP to the diet ameliorated the Cd-induced decline in ingestive behavior and swimming behavior, and reversed the Cd-induced increase in aggressive behavior. The significant decrease in the non-enzymatic (reduced glutathione) and enzymatic (catalase and superoxide dismutase) brain antioxidants detected in Cd-exposed fish was eliminated by dietary PLNP. PLNP supplementation also led to a decrease in brain malondialdehyde content, which was elevated by Cd exposure. In addition, dietary PLNP increased brain acetylcholinesterase content, upregulated mRNA expression of tight junction (zo-2, claudin-4, and zo-1) and oxidative stress genes (sod-2, gpx, and nrf-2), and downregulated apoptotic genes (p53, caspase-9, caspase-8, and caspase-3) in the brain, relative to the alterations in these parameters caused by Cd exposure. Furthermore, the Cd-induced histological changes in the Nile tilapia brain were ameliorated by PLNP dietary supplementation. In light of these findings, PLNP may be a useful dietary supplement for reducing the harmful effects of Cd on the brain and behavior of Nile tilapia.

HDAC4 suppresses porcine epidemic diarrhea virus infection through negatively regulating MEF2A-GLUT1/3 axis- mediated glucose uptake

Porcine epidemic diarrhea virus (PEDV), a porcine enteropathogenic coronavirus, causes severe diarrhea and death in neonatal piglets. Histone deacetylase 4 (HDAC4), a member of class IIa deacetylases, controls a wide range of physiological processes, but, little is known about its role in PEDV infection. Here, we report a novel strategy by which PEDV manipulates HDAC4. First, HDAC4 expression was examined, and showed a significant down-regulation in PEDV-infected Vero and IPEC-J2 cells. Subsequently, knockdown of HDAC4 by specific small interfering RNA (siRNA) led to an increase in viral infection, whereas overexpression of HDAC4 remarkably suppressed PEDV infection. Mechanistically, we showed that HDAC4 significantly reduced glucose uptake, as glucose is required for PEDV infection. Through screening, we identified glucose transporters 1 and 3 (GLUT1 and GLUT3) as responsible for glucose uptake during PEDV infection. We further confirmed that HDAC4 regulated GLUT1 and GLUT3 expression through its converging hub, myocyte enhancer factor 2 A (MEF2A). Taken together, these findings contribute to a better understanding of a novel function of HDAC4 in regulating glucose uptake via MEF2A-GLUT1/3 to limit PEDV infection, and provide new strategies for the development of anti-PEDV drugs.

Acacetin Attenuates Cigarette Smoke Extract-Induced Human Bronchial Epithelial Cell Injury by Activating NRF2/SLC7A11/GPX4 Signaling to Inhibit Ferroptosis

Chronic obstructive pulmonary disease (COPD) stands as a major contributor to mortality worldwide, with cigarette smoke being a primary causative factor. Acacetin has been reported to possess lung protective effects. However, the precise role and mechanism of Acacetin in COPD remains elusive. In this study, human bronchial epithelial cell line HBE135-E6E7 was treated with Acacetin under cigarette smoke extract (CSE) conditions. Cellular viability was assessed using CCK-8 and LDH kits. Reactive oxygen species (ROS) generation was tested with DCFH-DA staining. JC-1 staining was employed to examine the mitochondrial membrane potential (MMP). Additionally, hydroxynonenal (4-HNE) level was tested using immunofluorescence staining and mitochondrial lipid peroxidation was evaluated using MitoPeDPP staining. MitoSOX staining was used to detect mitochondrial (mito)-ROS. Fe2+ level was measured using FerroOrange staining and the expression of ferroptosis-related proteins was detected with western blot. Besides, the binding between Acacetin and NRF2 was analyzed by molecular docking. The sequent NRF2 overexpression or knockdown was used to explore the regulation of Acacetin on NRF2/SLC7A11/GPX4 signaling. Results indicated that CSE significantly reduced the viability, augmented ROS generation and decreased MMP in HBE135-E6E7 cells, which were blocked by Acacetin addition. Moreover, Acacetin inhibited lipid peroxidation and ferroptosis in CSE-treated HBE135-E6E7 cells. Specifically, Acacetin targeted NRF2 and activated the NRF2/SLC7A11/GPX4 signaling in CSE-induced HBE135-E6E7 cells. Furthermore, NRF2 deficiency or ML-385 treatment notably restored the influences of Acacetin on oxidative stress and ferroptosis in HBE135-E6E7 cells challenged with CSE. In conclusion, Acacetin alleviated CSE-induced injury in HBE135-E6E7 cells by activating The NRF2/SLC7A11/GPX4 signaling to inhibit ferroptosis.

MiR-33-Mediated Regulation of Autophagy and Inflammation in CIK Cells Through Atg5

MicroRNA-33 (miR-33) plays a critical role in the regulation of autophagy and inflammatory responses. In this study, C. idella kidney (CIK) cells were transfected with a miR-33 mimic or inhibitor and Atg5 was overexpressed or silenced to elucidate the regulatory mechanism of miR-33. Our findings revealed that the miR-33 mimic significantly decreased the expression of LC3B (a marker of autophagy activation), and the level of autophagy-related genes (Beclin-1, Atg5 and LC3-1) was also significantly downregulated (p < 0.05). Additionally, the miR-33 mimic promoted the secretion of proinflammatory factors, including TNF-α, IL-6, IL-12 and IL-1β (p < 0.05). In contrast, the miR-33 inhibitor significantly enhanced LC3B protein expression and increased the relative expression of Beclin-1 and Atg5 (p < 0.05). The secretion of proinflammatory factors (TNF-α, IL-6 and IL-12) was significantly reduced (p < 0.05). These results suggested that inhibition of miR-33 could induce the initiation of autophagy and attenuate the inflammatory response in CIK cells. Furthermore, we identified Atg5 as a direct target gene of miR-33. Overexpression of Atg5 significantly upregulated the levels of Beclin-1, Atg5, Atg4C and LC3-1, along with a reduction in the secretion of proinflammatory factors (TNF-α, IL-12 and IL-1β). Besides, the activities of superoxide dismutase (SOD) and catalase (CAT) were significantly increased (p < 0.05). Conversely, interference with Atg5 expression caused significant downregulation in the expression levels of Beclin-1, Atg5, Atg12, Atg4C and LC3-1, resulting in increased secretion of TNF-α, IL-12 and IL-1β and decreased activity of acid phosphatase (ACP) and SOD (p < 0.05). Taken together, these results suggested that inhibition of miR-33 expression could promote the initiation of autophagy and attenuate the inflammation in CIK cells through targeting Atg5. This study not only enhances the understanding of the mechanism by which miR-33 regulates autophagy and inflammation in fish but also provides a theoretical foundation and novel insights to improve disease management in the fish aquaculture industry.

The stress-associated small heat shock protein affects stem cell proliferation, differentiation, and tissue-specific transcriptional networks during regeneration in Dugesia japonica

Small heat shock proteins (sHSPs) represent a highly conserved family of molecular chaperones primarily known for their roles in protein homeostasis and stress responses. However, their involvement in regulating stem cell dynamics and tissue regeneration remains insufficiently characterized, particularly in planarians, a model organism renowned for its extraordinary regenerative capacity. In planarians, regeneration is driven by pluripotent stem cells, referred to as neoblasts, which are the only proliferative cells responsible for tissue repair and homeostasis. In this study, we identified a novel sHSP, DjsHSP, in Dugesia japonica and investigated its functional role in regeneration. Using RNA interference (RNAi), we demonstrated that DjsHSP knockdown significantly delayed regeneration of the blastema, intestine, eyes, and neural tissue. Mechanistically, DjsHSP knockdown disrupted neoblasts dynamics, leading to abnormal proliferation and impaired differentiation. This was associated with altered expression of lineage-specific transcription factors critical for triploblastic tissue differentiation. Furthermore, the knockdown of DjsHSP downregulated key transcription factors regulating organ-specific regeneration, contributing to defective tissue regeneration. These findings suggest that DjsHSP affects stem cell fate and organ regeneration by maintaining the balance between stem cell proliferation and differentiation and modulating tissue-specific transcriptional networks. Our study provides new insights into the molecular mechanisms underlying planarian regeneration, with potential implications for advancing regenerative medicine.

Effects of magnolol on the liver antioxidant status in rats with diabetes

BACKGROUND

Magnolol isolated from Magnolia (Magnolia sp.) flowers are used to support the treatment of diabetes. The aim of this study was to investigate the effects of magnolol on the liver antioxidant status in rats with type 2 diabetes and assess oxidative stress parameters at both biochemical and molecular levels.

METHODS

Mature male Wistar rats with high-fat diet (HFD) and streptozotocin (STZ)-induced type 2 diabetes were administered magnolol at doses of 5 or 25 mg/kg body weight po for 4 weeks. Then, the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx), the concentrations of advanced protein oxidation products (AOPPs) and malondialdehyde (MDA), the total antioxidant response (TAR), and the total oxidative status (TOS) were assessed using commercially available colorimetric kits according to the manufacturers' protocols. The mRNA levels of the cytochrome P450 family 1 subfamily A member 2 (CYP1A2), cytochrome P450 family 2 subfamily E member 1 (CYP2E1), nuclear factor erythroid 2-related factor 2 (NFE2L2), and Kelch like ECH-associated protein 1 (KEAP1) genes were determined using real-time quantitative reverse transcription-polymerase chain reaction (RT‒qPCR). All parameters were analyzed in liver samples.

RESULTS

Compared with 5 mg/kg magnolol, 25 mg/kg magnolol had a more beneficial effect on several indicators of oxidative stress in the liver observed as significant decreases in the activity of SOD and CAT, as well as decreased MDA concentrations. Further, significant increases in the concentrations of AOPPs and native thiols were observed. The gene encoding CYP2E1 was upregulated in diabetic rats compared with control rats. Moreover, compared with diabetic rats, diabetic rats treated with 25 mg/kg magnolol presented increased expression of the KEAP1 gene.

CONCLUSIONS

The induction of diabetes is known to disturb redox homeostasis. The administration of magnolol at the higher dose used in this study, might counteract the changes in the liver antioxidant status at both the molecular and biochemical levels. Owing to the positive alterations in some oxidative stress parameters, after further in-depth study, magnolol may be considered a promising compound that could be used to complement diabetes treatment.

Physiological functions of the transcription factor GmZAT10-1 gene involved in the salt stress adaptation in soybean

C2H2-type zinc finger proteins (ZFPs) play important roles in the gene transcriptional regulation in the response of plants to multiple stressful environments. In this work, the responses of the soybean ZFP family member GmZAT10-1 gene and its promoter to salt stress, and the changes in the seedling growth phenotype, as well as the related physiological parameters in overexpressing (OE)- or CRISPR/Cas9 (KO)-GmZAT10-1 hairy-root composite soybean seedlings and transgenic Arabidopsis thaliana under salt stress were investigated. The results showed that both GmZAT10-1 and its promoter exhibited enhanced induction to salt stress, and the GmZAT10-1 protein displayed the transcriptional activation activity and was located in the cell nucleus. Transient expression of GmZAT10-1 in tobacco leaves and yeast one-hybrid assay (Y1H) revealed that GmZAT10-1 can bind to the promoter of GmCLC-c1 to enhance the expression of the target genes. Compared with the empty vector-transformed (Ev) hairy-root composite soybean plants, the salt-stressed OE-GmZAT10-1 and KO-GmZAT10-1 plants presented mitigated salt injury, greater plant height, fresh weight per plant, leaf relative water content (RWC) and chlorophyll content, and lower relative electrolytic leakage (REL) and malondialdehyde (MDA) content in the roots and leaves, among which the accumulation of Cl- and NO3- increased significantly in the roots of OE-GmZAT10-1, which obviously reduced the transport and accumulation of Cl- to the stems and leaves, and thus resulting in a marked decrease in Cl-/NO3- ratio in the roots, stems and leaves. By introducing the GmZAT10-1 gene into A. thaliana wild-type (WT) and atzat10 mutant, the seed germination rates and root lengths of WT-GmZAT10-1 and atzat10-GmZAT10-1 under salt stress were obviously restored, and the leaf chlorophyll content and RWC were significantly increased, whereas the REL values and MDA contents were significantly decreased. Additionally, significant accumulation of Cl- and Na+ was observed in the roots, which resulted in a significant decrease in Cl-/NO3-and Na+/K+ ratios in the shoots. Taken together, these findings indicate that the transcription factor GmZAT10-1 may confer salt tolerance in soybeans by upregulating the expression of the GmCLC-c1 gene through binding to its promoter, regulating the uptake of Cl- by the roots and reducing its translocation to the above-ground parts, including the stems and leaves of the plants, thereby maintaining a relatively low Cl-/NO3- ratio.

Expression and functional analysis of adipokinetic hormone reveal its different roles in larval development and female fecundity in Panonychus citri (McGregor) (Acari: Tetranychidae)

Adipokinetic hormone (AKH), a crucial neuropeptide, participates in the important physiological processes by specially binding to its receptor to activate the AKH signalling pathway. AKH regulates energy metabolism. However, it remains unknown whether AKH affects larval development and adult reproduction by influencing energy metabolism. In the present study, the AKH was identified from Panonychus citri and contained the conserved functional domain 'Q-[LIV]-[NT]-F-[ST]-X (2)-W' that characterises the AKH family. The relative expression levels of PcAKH revealed different patterns of AKH expression at different developmental stages of P. citri. Feeding of double-standard RNA against PcAKH induced decreased fecundity and reduced survival, which was accompanied by the down-regulation of vitellogenin gene expression. In addition, after silencing the PcAKH, lipid metabolism and carbohydrate homeostasis were disrupted, manifested by increased body width and weight, and fasting phenomenon. Further investigation found that compared with the control, physiological changes in trehalose and triglyceride contents were accompanied by variations in the mRNA expression levels of genes related to lipid metabolism and carbohydrate metabolism. The disorder of lipid and carbohydrate metabolism may affect adult female reproduction, which may lead to insufficient vitellogenin deposition. Moreover, the silencing of PcAKH seriously affected the growth and development of larvae, which was manifested as delayed development period and difficulty in moulting. Conclusively, all these results in current study demonstrated that double-stranded RNA silencing system targeting PcAKH effectively inhibited larval development and female fecundity by disturbing lipid and carbohydrate metabolism, and PcAKH is a specific RNAi target for control of P. citri in the design and development of biopesticide in sustainable agriculture.

Genome-wide association study and BSR-seq identify nitrate reductase-related genes in rice landraces (Oryza sativa L.)

Nitrogen (N) is an essential nutrient for rice (Oryza sativa L.) growth and development. However, the lower nitrogen use efficiency (NUE) results in an N fertilizer surplus, which causes many environmental problems. In this study, genome-wide association studies were used to detect nitrate reductase (NR)-related loci in 419 rice landraces. Using the general linear model (GLM), mixed linear model (MLM), linear model (LM), and linear mixed model (LMM), we found six, nine, seven, and six significant single-nucleotide polymorphisms (SNPs) associated (p < 1 × 10-5) for three traits. Moreover, 98 significant SNPs were associated (logarithm of odds ≥ 3) with three traits through 3 V multi-locus random-SNP-effect mixed linear model. Interestingly, we found that Chr1_15896481 was significantly associated in the GLM, MLM, LM, and LMM models. Meanwhile, this significant locus overlapped with a candidate region in bulked segregant RNA sequencing. Through integrated analysis, we identified a most likely candidate genomic region 15,627,420-16,084,761 bp on chromosome 1. By performing functional annotation, RNA sequencing, and real-time quantitative polymerase chain reaction (RT-qPCR) analysis for the genes within this interval, we identified five candidate genes that may affect NR activity. Os01g0378400 exhibits a gene expression pattern highly similar to that of OsNR1.2. It belongs to the NAC transcription factor family, which is involved in plant N metabolism. Os01g0377700 is homologous to an ammonium transporter gene (Cre06g293051). Os01g0383700 encodes a WD40 domain protein, Os01g0379400 encodes an F-box protein, and Os01g0382800 encodes a DYW-type PPR domain protein. These findings will provide valuable genetic resources for NUE genetic improvement in rice breeding.

Carotene hydroxylase DcCYP97A3 affects carotenoid metabolic flow and taproot color by influencing the conversion of α-carotene to lutein in carrot

The color diversity of non-purple carrot taproots is mainly affected by carotenoid species and content. Carrot cytochrome P450 carotene β-ring hydroxylase (DcCYP97A3) may influence carotenoid accumulation in carrots; however, the roles of DcCYP97A3 in carrot remain unclear. Compared to the orange carrot 'Kurodagosun, KRD', the yellow carrot 'Yellowstone, YST' had greater relative transcript levels of DcCYP97A3. DcCYP97A3 was shown to catalyze the β-ring hydroxylation of α-carotene to create zeaxanthin when it was expressed in Escherichia coli accumulating α- and β-carotene. Expression of the DcCYP97A3 of 'YST' in DcCYP97A3 functionally deficient orange carrot 'KRD' resulted in yellow taproots, decreased α-carotene and β-carotene content, decreased α-/β-carotene ratio, and increased lutein content. In carrots overexpressing the DcCYP97A3 gene, the transcript levels of DcLCYE and DcLCYB1 were significantly upregulated and downregulated, respectively. Gene editing of DcCYP97A3 in 'YST' resulted in DcCYP97A3 knockout mutants with significantly reduced levels of lutein and β-carotene and significantly upregulated transcript levels of DcCHXB2 and DcCCD4. These findings advance our knowledge of the molecular mechanisms behind carrot carotenoid metabolism.

Thallium induces metallothionein gene expression in Huh-7 human hepatoma cells

Thallium (Tl) is one of the most toxic heavy metals and is found ubiquitously in the earth's crust. To investigate the cellular responses to and against Tl cytotoxicity, we conducted DNA microarray analysis using three human cell lines of different origins: SH-SY5Y (neuroblast-derived), HEK293T (embryonic kidney-derived), and Huh-7 (hepatoma-derived) cells. All of the ten genes that showed the highest inductions in Huh-7 cells treated with 60 µM Tl2SO4 for 72 hours are metallothionein (MT) genes. The induction of the MT genes appears specific to Huh-7 cells; increases of 50-140-fold in the ten MT genes were observed in Huh-7 cells, while the increases were less than 4-fold in HEK293T and SH-SY5Y cells by microarray analysis. Investigation of the pathway responsible for Tl2SO4-induced MT expression in Huh-7 cells revealed that the RNA interference-mediated forced downregulation of MTF1 transcription factor resulted in the suppression of Tl2SO4-induced MT gene expressions, but not Tl2SO4-induced cell death, suggesting that MTF1-mediated MT gene expression is insufficient to protect Huh-7 cells against death by Tl2SO4. In contrast, the knockdown of nrf1 worsened Tl2SO4-induced cell death without suppressing MT gene expressions. These results indicate that MT gene induction in response to Tl2SO4 is mediated at least in part by MTF1 in Huh-7 cells. Nevertheless, MT gene induction through MTF1 seems insufficient to prevent the cell death caused by Tl2SO4. Nrf1 appears to be involved in protection against Tl2SO4 toxicity through mechanisms other than MT gene induction.

Effects of dietary taurine on growth, taurine metabolism and Vibrio crassostreae resistance in juvenile clam Ruditapes philippinarum

Taurine serves an important role in all aquatic animals. The purpose of this experiment was to investigate the effects of exogenous taurine on growth, endogenous taurine metabolism, and Vibrio crassostreae resistance in juvenile clam Ruditapes philippinarum. Microencapsulated taurine concentrations of 0, 0.75, 1.5, 3 and 6 mg/g clam wet weight were designated as the T0, T0.75, T1.5, T3 and T6 groups. After 2 weeks of feeding, the results demonstrated that exogenous taurine did not promote the growth of clams (P > 0.05). The taurine content of clams was increased significantly with the increase of exogenous taurine content (P < 0.05). The gene expression of taurine transporter (TauT) was significantly elevated in the T3 and T6 groups compared to the T0 group (P < 0.05). With the addition of exogenous taurine, mRNA expressions of cysteine sulfinic acid decarboxylase (CSAD), 2-aminoethylsulfide dioxygenase (ADO), cysteine dioxygenase (CDO), cystathionine β-synthase (CBS), cystathionine γ-lyase (CSE) and serine dehydratase (SDH) were suppressed (P < 0.05). The survival rate of clams challenged with Vibrio crassostreae was significantly higher in the T0.75 group compared to the T0 group on the fifth day (P < 0.05). Additionally, the activities of antioxidant enzymes and lysozyme were significantly elevated, immune-related and anti-inflammatory factor genes were upregulated, while pro-inflammatory factor genes were downregulated in the T0.75 group compared to the T0 group (P < 0.05). Dietary taurine supplementation regulates endogenous taurine metabolism and exhibits potential anti-Vibrio effect in clam R. philippinarum.

Obesity-related drug-metabolizing enzyme expression alterations in the human liver

OBJECTIVE

Implications of obesity extend beyond the association with various health conditions, impacting physiological changes that affect the liver and the activity of metabolizing enzymes. Given the prevalence of obesity and the risk for drug-drug interactions owing to the comorbidity burden, the current drug dosage recommendations may need reevaluation for patients with obesity. This study evaluated the implications of obesity on the gene expression of hepatic drug-metabolizing enzymes. As drug clearance is an essential pharmacokinetic parameter for maintaining drug dosing regimens, investigating alterations in metabolizing enzymes expression is a critical step.

METHODS

Human liver samples were collected post-mortem from 32 individuals and classified into the control (18.5 ≤ BMI <25 kg/m2; range 18.9-24.4 kg/m2; median 22.3 kg/m2) and the study group (BMI ≥25 kg/m2; range 25.1-55.5 kg/m2; median 31.2 kg/m2). Real-time quantitative PCR was performed for the analysis of 168 drug-metabolizing enzymes.

RESULTS

Our studies revealed several potential physiologically relevant differences, but the statistical significance was reached only for ALDH3B1, PTGS1, and CEL (all being up-regulated in the study group).

CONCLUSIONS

The study adds to our understanding of the mechanisms of pharmacokinetic changes in overweight and obesity. The findings require further exploration on the protein level, through proteomic and functional studies.

Loss of non-muscle myosin II Zipper leads to apoptosis-induced compensatory proliferation in Drosophila

Drosophila Non-muscle myosin II Zipper (Zip) belongs to a functionally divergent class of molecular motors that play a vital role in various cellular processes including cell adhesion, cell migration, cell protrusion, and maintenance of polarity via its cross-linking property with actin. To further determine its role in cell proliferation and apoptosis, we carried out Zip loss of function studies that led to compromised epithelial integrity in Drosophila wing imaginal discs as evident from the perturbed expression pattern of cell-cell junction proteins Cadherin, Actin, and Armadillo. Disruption of these adhesion proteins resulted in the cells undergoing apoptosis as evident from the increased level of effector caspase, cDcp-1. The induction of cell death due to the loss of function of Zip was accompanied by proliferation as apparent from increased PH3 staining. The control of apoptosis-induced compensatory proliferation lies under the caspase cascade. We carried out experiments that suggested that the apical caspase Dronc is responsible for the apoptosis-induced compensatory proliferation due to the loss of Zip function and not the effector caspase Drice/Dcp-1. Further, it was observed that Dronc leads to the subsequent activation of Jun N-terminal kinase pathway (JNK) pathway and Wingless (Wg) mitogen that diffuse to the neighboring cells and prompt them to undergo cell division. Taken together, our results suggest that loss of function of Zip leads to apoptosis-induced compensatory proliferation.

The rabies virus matrix protein (RABV M) interacts with host histone deacetylase 6 (HDAC6) to activate the MEK/ ERK signaling pathway and enhance viral replication

Rabies virus (RABV) is the causative agent of rabies, posing a severe threat to human and animal health. The matrix (M) protein of RABV plays crucial roles during viral infection. In this study, we identified RABV M protein interacted with host histone deacetylase 6 (HDAC6) through a combination of immunoprecipitation and mass spectrometry analysis. Specifically, the catalytic domains of HDAC6 (amino acids 435-835) was shown to be critical for the interaction between HDAC6 and the RABV M protein. Overexpression of HDAC6 significantly enhanced RABV replication, whereas inhibition of HDAC6 expression or its deacetylase activity had the opposite effect，indicating that HDAC6 is a positive regulator of RABV replication. We further determined that RABV infection actives the MEK/ERK pathway, and inhibition of this pathway with U0126 significantly reduced viral titers. Moreover, HDAC6 positively regulated MEK/ERK pathway activation in a manner independent of its deacetylase activity but dependent on the presence of HDAC6 during virus infection. Finally, we demonstrated that co-expression of RABV M enhanced the role of HDAC6 in facilitating MEK/ERK pathway activation. Collectively, our findings demonstrate that RABV exploits the HDAC6-M interaction to hijack the MEK/ERK signaling axis, which is essential for viral replication. Notably, HDAC6 facilitates MEK/ERK activation in a deacetylase activity-independent manner, revealing a novel mechanism by which viruses manipulate host machinery. These results highlight HDAC6 as a potential therapeutic target for combating rabies.