CEACAM1 inhibits cell-matrix adhesion and promotes cell migration through regulating the expression of N-cadherin

Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is a member of the immunoglobulin super family and has been observed to have two paradoxical functions: tumor suppression and the promotion of tumor invasion. In the present study, we discovered that CEACAM1 functions as an adhesion inhibitor and a migration promoter. The CEACAM1 transfected cells, either 293-CEACAM1 or LOVO/trans-CEACAM1, was proved to have lower adhesion rate. Furthermore, HT29/siRNA-CEACAM1 cells had a higher adhesion rate than HT29 cells. These results indicated that CEACAM1 was an inhibitor of cell-matrix adhesion. Additionally, 293-CEACAM1 LOVO/trans-CEACAM1 cells exhibited better motility in a trans-well migration assay. N-cadherin expression levels were positively correlated with CEACAM1 in 293-CEACAM1, LOVO/trans-CEACAM1 and HT29/siRNA-CEACAM1 cells. When blocked by a GC-4 antibody, the adhesive capacities of 293-CEACAM1 and LOVO/trans-CEACAM1 were recovered and the motilities of them were suppressed, which suggested that CEACAM1 functioned through N-cadherin.     

Effects of pyriproxyfen on ovarian development and fecundity ofRhagoletis pomonella flies

Three-day old female apple maggot flies,Rhagoletis pomonella (Walsh), were topically exposed to different doses (0.1, 1, 10, and 100 μg per fly) of a juvenile hormone mimic, pyriproxyfen, in the laboratory. Pyriproxyfen had little lethal effect on females except at the extremely high dose of 100 μg. It also had no significant effect on egg viability of treated females. A non-lethal dose of 1 μg per fly did, however, enhance significantly the fecundity (egg production) as well as the ovarian development (number of eggs in ovaries and length of egg folicles) of treated flies. We conclude that pyriproxyfen could be a useful aid in exploring endocrine regulation of feeding and reproductive physiology behavior inR. pomonella, about which current knowledge is scant.     

Lin28B regulates the fate of grafted mesenchymal stem cells and enhances their protective effects against Alzheimer's disease by upregulating IGF-2

Mesenchymal stem cells (MSCs) transplantation has emerged as a potential therapeutic approach for Alzheimer's disease (AD). However, the poor proliferation capacity and low survival rate of engrafted MSCs in the hostile microenvironment of AD limit their therapeutic efficiency. Lin28B is a conserved RNA-binding protein associated with cell self-renewal and survival. The purpose of the present study was to explore whether lin28B might influence the functions of implanted MSCs and strengthen their neuroprotective potential in AD. A gain-of-function assay was used to upregulate lin28B expression in MSCs by lentiviral transfection. Our in vitro results indicated that lin28B promoted MSCs proliferation and migration, and protected MSCs against Aβ1–42-induced cell death by upregulating insulin-like growth factor-2 (IGF-2). Blockage of IGF-2 partially abrogated the above effects of lin28B. After intracerebroventricular injection into amyloid precursor protein/presenilin 1 mice, implanted MSCs were monitored using bioluminescence imaging. We observed that administration of MSCs transfected with lin28B significantly stimulated their proliferation and prolonged cell retention after delivery. Moreover, administration of the transfected MSCs markedly mitigated cognitive deficits, promoted amyloid plaque clearance, decreased the activation of microglia, and reduced neuronal cell death. The data above confirmed our hypothesis that lin28B is a crucial modulator determining the fate of transplanted MSCs by regulating IGF-2-associated pathways and thereby enhancing their protective effects against AD.     

Formation Mechanism and Occurrence Law of Pod Shattering in Soybean: A Review

Seed shattering refers to the phenomenon in which the pods split along the abdominal and back sutures before the crop is received, so that the seeds are spread. Seed shattering is vital to the reproduction of their offspring in wild plants, but it is also the main cause of crop yield loss reason. Pod-explosion resistance is a complex process of physical and physiological and biochemical reactions. Soybean seed shattering phenomenon is widespread, which severely restricts the development of soybean industry. Seed shattering (pod cracking or fruit dropping) is essential for the reproduction of its offspring in wild plants, but it is also the main cause of crop yield loss. This article analyzes the morphology and structure of pods related to seed shattering from the morphology of pods. On the basis of the regularity of the occurrence of seed shattering and the summary of phenotypic index identification methods, physiologically introduced the regulation mechanism of key enzymes and endogenous hormones on seed shattering. The localization, labeling and cloning of seed shattering genes are introduced in molecular biology. The study focused on reviewing the latest advances in the research on soybean seed shattering characteristics, and discussed with the research results of related crops. Finally, the research and application of soybean seed shattering resistance were prospected for several aspects.     

Correction to: An integrated strategy for polyploidization of Cerastigma willmottianum Stapf based on tissue culture and chemical mutagenesis and the carbon dioxide fixation ability of tetraploids

Plant Cell, Tissue and Organ Culture (PCTOC) -     

Pathogenic analysis of coxsackievirus A10 in rhesus macaques

Coxsackievirus A10 (CV-A10) is one of the etiological agents associated with hand, foot and mouth disease (HFMD) and also causes a variety of illnesses in humans, including pneumonia, and myocarditis. Different people, particularly young children, may have different immunological responses to infection. Current CV-A10 infection animal models provide only a rudimentary understanding of the pathogenesis and effects of this virus. The characteristics of CV-A10 infection, replication, and shedding in humans remain unknown. In this study, rhesus macaques were infected by CV-A10 via respiratory or digestive route to mimic the HFMD in humans. The clinical symptoms, viral shedding, inflammatory response and pathologic changes were investigated in acute infection (1–11 day post infection) and recovery period (12–180 day post infection). All infected rhesus macaques during acute infection showed obvious viremia and clinical symptoms which were comparable to those observed in humans. Substantial inflammatory pathological damages were observed in multi-organs, including the lung, heart, liver, and kidney. During the acute period, all rhesus macaques displayed clinical signs, viral shedding, normalization of serum cytokines, and increased serum neutralizing antibodies, whereas inflammatory factors caused some animals to develop severe hyperglycemia during the recovery period. In addition, there were no significant differences between respiratory and digestive tract infected animals. Overall, all data presented suggest that the rhesus macaques provide the first non-human primate animal model for investigating CV-A10 pathophysiology and assessing the development of potential human therapies.     

CD146 as a promising therapeutic target for retinal and choroidal neovascularization diseases

Science China Life Sciences - Blood vessel dysfunction causes several retinal diseases, including diabetic retinopathy, familial exudative vitreoretinopathy, macular degeneration and choroidal...     

Functional Mechanism of Antimicrobial Peptide Bomidin and Its Safety for Macrobrachium rosenbergii

Macrobrachium rosenbergii is an economically important source of crustacean seafood worldwide. Vibrio parahaemolyticus is an important aquatic pathogen that causes epidemics of acute hepatopancreatic necrosis in shrimp populations, which results in significant economic losses to aquaculture farmers. To prevent the antibiotics abuse, which has become a serious threat to human health, novel anti-infective strategies are urgently required to control V. parahaemolyticus. Antimicrobial peptides, which exhibit favourable germicidal activity compared to traditional antibiotics, can be used as a key method to prevent and treat bacterial diseases. Herein, an antimicrobial peptide, bomidin, was expressed through genetic engineering technology. The minimum inhibitory concentration (MIC) of bomidin showed a significant inhibitory effect on V. parahaemolyticus that was equivalent to that of ampicillin. Subsequently, the mechanism of action of recombinant bomidin was explored using PNP and ONPG assays to investigate the effects on membrane permeability. These assays indicated that bomidin penetrated the germ membrane and induced the release of cytoplasmic contents and ultimately interacted with DNA to form a bomidin–DNA complex that inhibits bacterial survival. Transmission electron microscopy and scanning electron microscopy revealed that bomidin could cause damage and dysfunction to the cell wall and membrane. Bomidin was nontoxic to mouse red blood cells within a concentration range that was much larger than the MIC. Toxicity assays revealed that 0.02 mg/mL bomidin was safe for use with juvenile freshwater prawns of M. rosenbergii and significantly inhibited the growth of V. parahaemolyticus in cultured water. These results demonstrated that synthetic peptide bomidin had great antibacterial effect against V. parahaemolyticus and therefore a therapeutic potential in aquaculture.

     

替米沙坦调控miR-495-3p/心肌细胞增强因子2A通路减轻缺氧诱导的神经细胞PC12损伤

目的探讨替米沙坦（TM）调控miR-495-3p/心肌细胞增强因子2A （MEF2A）通路对缺氧诱导PC12细胞损伤的影响和机制。 方法将PC12细胞进行正常培养（对照）,缺氧（缺氧24 h）,缺氧+ 0.1、1、10 μg/mL TM、缺氧+ miR-NC （转染miR-NC）,缺氧+miR-495-3p （转染miR-495-3p模拟物）,缺氧+TM+anti-miR-NC （转染anti-miR-NC,10 μg/mL TM）和缺氧+ TM+anti-miR-495-3p （转染anti-miR-495-3p,10 μg/mL TM）处理。酶联免疫吸附实验（ELISA）检测乳酸脱氢酶（LDH）漏出量和超氧化物歧化酶（SOD）的活性,流式细胞术检测细胞凋亡,实时荧光定量PCR （RT-qPCR）和Western blot检测miR-495-3p、心肌细胞增强因子2A （MEF2A）表达水平。两组间比较采用t检验,多组间比较采用单因素方差分析,组间两两比较采用LSD-t检验。 结果与对照比较,缺氧处理的PC12细胞LDH漏出率[（9.46±0.97）﹪比（45.69±4.31）﹪]、细胞凋亡率[（5.36±0.54）﹪比（28.36±2.41）﹪]、MEF2A mRNA（1.00±0.08比2.74±0.26）和MEF2A蛋白表达水平（0.39±0.03比0.87±0.06）均升高;SOD活性[（12.24 ±1.13）比（5.13±0.52 ）U/mL）]和miR-495-3p表达水平（1.00±0.08比0.35±0.03）均降低,差异有统计学意义（P均< 0.05）。与缺氧处理比较,缺氧+0.1、1、10 μg/mL TM干预的PC12细胞LDH漏出率[（45.69±4.31）﹪比（32.14±3.84）﹪、（23.54±3.17）﹪、（16.87±1.46）﹪]、细胞凋亡率[（28.36±2.41）﹪比（22.46±2.31）﹪、（17.14±1.65）﹪、（10.23±1.12）﹪]、MEF2A mRNA（2.74±0.26比2.26±0.23、1.87±0.19、1.34±0.18）和MEF2A蛋白表达水平（0.87±0.06比0.75±0.05、0.63±0.04、0.46±0.03）均降低;SOD活性[（5.13±0.52）比（6.87±0.69 ）、（8.01±0.81）、（10.12±1.02）U/mL]、miR-495-3p表达水平（0.35±0.03比0.49±0.04、0.61±0.06、0.83±0.07）均升高,差异有统计学意义（P均< 0.05）。与缺氧+ miR-NC比较,缺氧+ miR-495-3p的PC12细胞LDH漏出率[（46.87±4.28）﹪比（19.65±1.87）﹪]和细胞凋亡率[（28.38±2.44）﹪比（12.36±1.25）﹪]均降低,SOD活性[（5.15±0.51）比（9.67±0.97）U/mL]升高,差异有统计学意义（P均< 0.05）。与缺氧+TM+anti-miR-NC比较,缺氧+TM+anti-miR-495-3p的PC12细胞LDH漏出率[（17.64±1.79）﹪比（32.69±3.57）﹪]和细胞凋亡率[（10.98±1.75）﹪比（22.64±2.13）﹪]均升高,SOD活性[（12.63±1.27）比（7.32±0.71）U/mL]降低,差异有统计学意义（P均< 0.05）。 结论TM通过上调miR-495-3p/MEF2A通路对缺氧诱导的PC12细胞损伤具有保护作用。     

NUCLEAR PORE ANCHOR and EARLY IN SHORT DAYS 4 negatively regulate abscisic acid signaling by inhibiting Snf1-related protein kinase2 activity and stability in Arabidopsis

Abscisic acid (ABA) is a key regulator of plant responses to abiotic stresses, such as drought. Abscisic acid receptors and coreceptors perceive ABA to activate Snf1-related protein kinase2s (SnRK2s) that phosphorylate downstream effectors, thereby activating ABA signaling and the stress response. As stress responses come with fitness penalties for plants, it is crucial to tightly control SnRK2 kinase activity to restrict ABA signaling. However, how SnRK2 kinases are inactivated remains elusive. Here, we show that NUCLEAR PORE ANCHOR (NUA), a nuclear pore complex (NPC) component, negatively regulates ABA-mediated inhibition of seed germination and post-germination growth, and drought tolerance in Arabidopsis thaliana. The role of NUA in response to ABA depends on SnRK2.2 and SnRK2.3 for seed germination and on SnRK2.6 for drought. NUA does not directly inhibit the phosphorylation of these SnRK2s or affects their abundance. However, the NUA-interacting protein EARLY IN SHORT DAYS 4 (ESD4), a SUMO protease, negatively regulates ABA signaling by directly interacting with and inhibiting SnRK2 phosphorylation and protein levels. More importantly, we demonstrated that SnRK2.6 can be SUMOylated in vitro, and ESD4 inhibits its SUMOylation. Taken together, we identified NUA and ESD4 as SnRK2 kinase inhibitors that block SnRK2 activity, and reveal a mechanism whereby NUA and ESD4 negatively regulate plant responses to ABA and drought stress possibly through SUMOylation-dependent regulation of SnRK2s.