Surface Engineering of Perovskite Single Crystals by Atomic Layer Deposited Tin Oxide for Optical Communication.

Perovskite single crystals with excellent physical properties have broad prospects in the field of optoelectronics. However, the presence of dangling bonds, surface dislocations, and chemical impurities results in high surface defect density and sensitivity to humidity. Unfortunately, there are relatively few surface engineering strategies for single perovskite single crystals. We present a strategy utilizing atomic layer deposited SnOx to passivate surface defects in perovskite single crystals. The photodetector prepared based on the modified FAPbBr3 single crystals exhibits a low dark current of 1.89 × 10-9 A at a 5 V bias, close to 4 times lower with respect to the pristine device, a high detectivity of 2.3 × 1010 jones, and a fast response time of 27 µs. Moreover, the photodetectors feature long-term operational stability because the presence of a dense SnOx capping layer hinders the ingress of moisture and diffusion of ions. We further demonstrate the promise of our perovskite single crystal detectors for real-time subaqueous optical communication.

Genistein alleviates dextran sulfate sodium-induced colitis in mice through modulation of intestinal microbiota and macrophage polarization.

OBJECTIVES: Ulcerative colitis (UC) is a colonic immune system disorder, manifested with long duration and easy relapse. Genistein has been reported to possess various biological activities. However, it remains unclear whether genistein can ameliorate UC by modulating the homeostasis of the intestinal bacterial community. METHODS: The dextran sodium sulfate (DSS)-induced UC mice were administrated with genistein (20 mg/kg/day) or genistein (40 mg/kg/day) for ten days. The general physical condition of the mice was monitored. After sacrifice, the changes in colon length and colonic pathological morphology were observed. The expression of intestinal barrier proteins, inflammatory cytokines, and macrophage markers in the colon was detected. The composition and metabolic products of the intestinal microbiota were analyzed. RESULTS: Genistein treatment visibly improved body weight change and disease activity index in DSS-induced mice. Genistein treatment ameliorated colonic pathological alterations and promoted the expression of mucin-2 and tight junction proteins. Genistein administration inhibited myeloperoxidase activity and colonic inflammatory cytokines. Furthermore, genistein administration improved the structure of the intestinal microbial community, promoted the production of short-chain fatty acids, and modulated macrophage polarization. CONCLUSIONS: These results revealed that genistein mediated macrophage polarization balance by improving intestinal microbiota and its metabolites, thereby alleviating DSS-induced colitis.

Exploration of Synergistic Pesticidal Activities, Control Effects and Toxicology Study of a Monoterpene Essential Oil with Two Natural Alkaloids.

With the increasing development of pest resistances, it is not easy to achieve satisfactory control effects by using only one agrochemical. Additionally, although the alkaloid matrine (MT) isolated from Sophora flavescens is now utilized as a botanical pesticide in China, in fact, its pesticidal activities are much lower in magnitude than those of commercially agrochemicals. To improve its pesticidal activities, here, the joint pesticidal effects of MT with another alkaloid oxymatrine (OMT) (isolated from S. flavescens) and the monoterpene essential oil 1,8-cineole (CN) (isolated from the eucalyptus leaves) were investigated in the laboratory and greenhouse conditions. Moreover, their toxicological properties were also studied. Against Plutella xylostella, when the mass ratio of MT and OMT was 8/2, good larvicidal activity was obtained; against Tetranychus urticae, when the mass ratio of MT and OMT was 3/7, good acaricidal activity was obtained. Especially when MT and OMT were combined with CN, the significant synergistic effects were observed: against P. xylostella, the co-toxicity coefficient (CTC) of MT/OMT (8/2)/CN was 213; against T. urticae, the CTC of MT/OMT (3/7)/CN was 252. Moreover, the activity changes over time of two detoxification enzymes, carboxylesterase (CarE) and glutathione S-transferase (GST) of P. xylostella treated with MT/OMT (8/2)/CN, were observed. In addition, by scanning electron microscope (SEM), the toxicological study suggested that the acaricidal activity of MT/OMT (3/7)/CN may be related to the damage of the cuticle layer crest of T. urticae.

High Value-Added Application of Natural Plant Products in Crop Protection: Construction and Pesticidal Activities of Piperine-Type Ester Derivatives and Their Toxicology Study.

To discover new potential pesticide candidates, recently, structural modification of natural bioactive products has received much attention. In this work, a series of new piperine-type ester derivatives were regio- and stereoselectively synthesized based on a natural alkaloid piperine isolated from Piper nigrum. Their structures were characterized by IR, mp, 1H NMR (13C NMR), and high-resolution mass spectrometry (HRMS). Against Tetranychus cinnabarinus Boisduval (Acari: Tetranychidae), compounds 4e, 4f, 4u, and 4v displayed the most significant acaricidal activity with LC50 values of 0.155, 0.117, 0.177, and 0.164 mg/mL, respectively. Particularly, compound 4f showed >120-fold higher acaricidal activity than piperine (LC50: 14.198 mg/mL). Notably, the acaricidal activity of 4f was equivalent to that of the commercial acaricide spirodiclofen (LC50: 0.115 mg/mL). Additionally, against Eriosoma lanigerum Hausmann (Hemiptera: Aphididae), compounds 4w and 4b' showed 1.8-fold aphicidal activity of piperine. Furthermore, via the scanning electron microscope (SEM) imaging method, the obvious destruction of the construction of the cuticle layer of 4f-treated T. cinnabarinus was observed. Compound 4f could be further studied as a lead acaricidal agent.

Cobimetinib Sensitizes Cervical Cancer to Paclitaxel via Suppressing Paclitaxel-Induced ERK Activation.

INTRODUCTION: Chemoresistance remains the main cause of treatment failure in cervical cancer and novel therapeutic strategies are required. Cobimetinib, a potent yet selective inhibitor of MEK1 and 2, is currently used to treat melanoma clinically. In this work, we identified cobimetinib as a promising candidate for treating cervical cancer. METHODS: The in vitro and in vivo efficacies of cobimetinib were examined using cervical cancer cell cultures and xenograft mouse model. Its combination with paclitaxel was analyzed using the combination index. Immunoblotting was performed on MAPK and ERK pathways. RESULTS: Cobimetinib displays a potent anti-cervical cancer activity in a panel of cell lines regardless of cellular origin and HPV presence, and its combination with paclitaxel is synergistic in inhibiting cervical cancer cells. This is achieved by the growth inhibition and caspase-dependent apoptosis induction, through inhibiting MAPK/ERK activation. In addition, paclitaxel activates ERK in cervical cancer cells, and this can be reversed by cobimetinib. We finally confirm the efficacy of cobimetinib alone and its combination with paclitaxel in the cervical cancer xenograft mouse model. DISCUSSION/CONCLUSION: Our preclinical findings will accelerate the initialization of clinical trials to use combination of cobimetinib and paclitaxel for treating cervical cancer. Our work also emphasizes the therapeutic value of targeting MAPK/ERK to overcome chemoresistance in cervical cancer.

The maize single-nucleus transcriptome comprehensively describes signaling networks governing movement and development of grass stomata.

The unique morphology of grass stomata enables rapid responses to environmental changes. Deciphering the basis for these responses is critical for improving food security. We have developed a planta platform of single-nucleus RNA-sequencing by combined fluorescence-activated nuclei flow sorting, and used it to identify cell types in mature and developing stomata from 33,098 nuclei of the maize epidermis-enriched tissues. Guard cells (GCs) and subsidiary cells (SCs) displayed differential expression of genes, besides those encoding transporters, involved in the abscisic acid, CO2, Ca2+, starch metabolism, and blue light signaling pathways, implicating coordinated signal integration in speedy stomatal responses, and of genes affecting cell wall plasticity, implying a more sophisticated relationship between GCs and SCs in stomatal development and dumbbell-shaped guard cell formation. The trajectory of stomatal development identified in young tissues, and by comparison to the bulk RNA-seq data of the MUTE defective mutant in stomatal development, confirmed known features, and shed light on key participants in stomatal development. Our study provides a valuable, comprehensive, and fundamental foundation for further insights into grass stomatal function.

Abemaciclib sensitizes HPV-negative cervical cancer to chemotherapy via specifically suppressing CDK4/6-Rb-E2F and mTOR pathways.

Cervical cancer is the second most common malignancy in women, and the novel therapeutic treatment is needed. Abemaciclib is a FDA-approved drug for breast cancer treatment. In this work, we identified that abemaciclib has potent anti-cervical cancer activity. We demonstrate that abemaciclib is the most effective drug against human papillomavirus (HPV)-negative cervical cancer cells compared to ribociclib and palbociclib, with its IC50 at nanomolar concentration range. This is achieved by the inhibition of proliferation and induction of apoptosis, through specifically suppressing CDK4/6-Rb-E2F and mTOR pathways by abemaciclib in HPV-negative cervical cancer cells. Of note, the combination of abemaciclib with paclitaxel and cisplatin at sublethal concentration results in much greater efficacy than chemotherapy alone. In addition, we confirm the efficacy of abemaciclib and its combination with paclitaxel or cisplatin at the doses that are not toxic to mice in HPV-negative cervical cancer xenograft mouse model. Interestingly, we show that abemaciclib and other CDK4/6 inhibitors are not effective in targeting HPV-positive cervical cancer cells, and this is likely to be associated with the high p16 and low Rb expression in HPV-positive cervical cancer cells. Our work is the first to provide the preclinical evidence to demonstrate the potential of abemaciclib for the treatment of HPV-negative cervical cancer. The mechanism analysis highlights the therapeutic value of inhibiting CDK4/6 in HPV-negative but not HPV-positive cervical cancer.

The role of R-spondin 1 through activating Wnt/ß-catenin in the growth, survival and migration of ovarian cancer cells.

Aberrant activation of the Wnt/ß-catenin has been shown to promote progression in various cancers, including ovarian cancer. However, the molecular mechanisms involved in Wnt/ß-catenin activation are not well elucidated. In the work, we identify that R-spondin 1 is an upstream regulator in Wnt/ß-catenin pathway to promote growth, survival and migration in ovarian cancer cells. We observe the upregulation of transcript and protein levels of R-spondin 1 in ovarian cancer cell lines and tissues compared to normal counterparts. R-spondin 1 upregulation via genetic (overexpression) and pharmacological (recombinant protein) approaches facilitates growth and migration of normal ovarian cells. R-spondin 1 downregulation via siRNA knockdown decreases proliferation and migration, and induces apoptosis in ovarian cancer cells. In addition, recombinant R-spondin 1 protects ovarian cancer cell against chemotherapy whereas R-spondin 1 knockdown sensitizes ovarian cancer cell response to chemotherapy. Importantly, increased ß-catenin activities and mRNA expression levels of Wnt/ß-catenin-targeted genes are detected in normal ovarian cells overexpressing R-spondin 1. In contrast, R-spondin 1 inhibition suppresses Wnt/ß-catenin signaling in ovarian cancer cells. We further identify that R-spondin 1 regulates ovarian cancer biological activities via activating Wnt/ß-catenin. Our work is the first to highlight the critical roles of R-spondin 1 in ovarian cancer progression and chemoresistance. Our work also provides a proper understanding on the regulation of Wnt/ß-catenin pathway in ovarian cancer.

Anthelmintic drug ivermectin inhibits angiogenesis, growth and survival of glioblastoma through inducing mitochondrial dysfunction and oxidative stress.

Glioblastoma is one of the most vascular brain tumour and highly resistant to current therapy. Targeting both glioblastoma cells and angiogenesis may present an effective therapeutic strategy for glioblastoma. In our work, we show that an anthelmintic drug, ivermectin, is active against glioblastoma cells in vitro and in vivo, and also targets angiogenesis. Ivermectin significantly inhibits growth and anchorage-independent colony formation in U87 and T98G glioblastoma cells. It induces apoptosis in these cells through a caspase-dependent manner. Ivermectin significantly suppresses the growth of two independent glioblastoma xenograft mouse models. In addition, ivermectin effectively targets angiogenesis through inhibiting capillary network formation, proliferation and survival in human brain microvascular endothelial cell (HBMEC). Mechanistically, ivermectin decreases mitochondrial respiration, membrane potential, ATP levels and increases mitochondrial superoxide in U87, T98G and HBMEC cells exposed to ivermectin. The inhibitory effects of ivermectin are significantly reversed in mitochondria-deficient cells or cells treated with antioxidants, further confirming that ivermectin acts through mitochondrial respiration inhibition and induction of oxidative stress. Importantly, we show that ivermectin suppresses phosphorylation of Akt, mTOR and ribosomal S6 in glioblastoma and HBMEC cells, suggesting its inhibitory role in deactivating Akt/mTOR pathway. Altogether, our work demonstrates that ivermectin is a useful addition to the treatment armamentarium for glioblastoma. Our work also highlights the therapeutic value of targeting mitochondrial metabolism in glioblastoma.

miR-125b regulates cell progression in chronic myeloid leukemia via targeting BAK1.

Chronic myeloid leukemia (CML) is a type of malignant tumor characterized by the accumulation of a large number of immature white blood cells in the blood and bone marrow. BAK1 was predicted to be the target gene of microRNA-451 (miR-125b). The present study was designed to illustrate the mechanism of miR-125b in regulating CML via targeting BAK1. In this study, we found that the expression of miR-125b increased strongly, whereas the expression of BAK1 decreased significantly in CML patients and CML cell lines compared with healthy controls. Moreover, the luciferase report assay confirmed the interaction between miR-125b and BAK1 mRNA. After transfection of the miR-125b mimic or miR-125b inhibitor into CML cells, we found that the inhibition of miR-125b decreased the proliferation rates and promoted apoptosis with cell cycle arrest at the G0/G1 phase in both K562 and NB-4 cells, increased the expression of BAK1 and Caspase-3, and decreased the expression of Bcl-2 and c-myc; the miR-125b mimic yielded the opposite results. In addition, siBAK1 offset the suppression effect of the miR-125b inhibitor in K562 cells, indicating that miR-125b promotes these cellular processes by inhibiting the expression of BAK1. Further in vivo experiments supported these findings because miR-125b suppression reduced CML growth in mice. Taken together, our study suggests that the down-regulation of miR-125b affects the expression of BAK1, promotes cell apoptosis and inhibits cell proliferation, leading to up-regulated expression of pro-apoptosis factors, down-regulated expression of anti-apoptosis factors in the mitochondrial apoptotic pathway, and decreased tumor size and weight of CML in vivo. These results provide a potential therapeutic strategy for CML.

Platelet factor 4 inhibits IL-17/Stat3 pathway via upregulation of SOCS3 expression in melanoma.

Platelet factor 4 (PF4) was the first discovered CXC chemokine and is found in platelet granules at very high concentration. Now, it is becoming increasingly evident that PF4 actively participates in inflammation and immune response. Recent paper demonstrated that PF4 limits the development and response of the Th17 cells and assisted in regulatory T cell development in transplantation. But, the immunoregulatory role of PF4 in tumor has little known and needs to be further investigated. In our current study, wild-type mice are inoculated with melanoma cell line B16-F10 (1 × 10(6)/mouse) and treated with PF4. PF4 inhibits B16 tumor growth and decreases γδ cell infiltration. The expression of interleukin (IL)-17, IL-6, and p-signal transducer and activator of transcription-3 (Stat3) was markedly decreased with treatment of PF4 compared with control in vivo and in vitro. And, the suppressed tumor growth induced by PF4 is abolished by additional treatment of recombinant mouse IL (rmIL)-17. PF4 also induces suppressor of cytokine signaling 3 (SOCS3) upregulations, and PF4 fails to suppress expression of p-Stat3, IL-17, and IL-6 in cells transfected with SOCS3 short interfering RNA (siRNA). In conclusion, PF4 inhibits IL-17/Stat3 pathway via upregulation of SOCS3 expression and may contribute to suppressing tumor growth in murine models of melanoma.