Invasive metastatic tumor-camouflaged ROS responsive nanosystem for targeting therapeutic brain injury after cardiac arrest.

Drug transmission through the blood-brain barrier (BBB) is considered an arduous challenge for brain injury treatment following the return of spontaneous circulation after cardiac arrest (CA-ROSC). Inspired by the propensity of melanoma metastasis to the brain, B16F10 cell membranes are camouflaged on 2-methoxyestradiol (2ME2)-loaded reactive oxygen species (ROS)-triggered "Padlock" nanoparticles that are constructed by phenylboronic acid pinacol esters conjugated D-a-tocopheryl polyethylene glycol succinate (TPGS-PBAP). The biomimetic nanoparticles (BM@TP/2ME2) can be internalized, mainly mediated by the mutual recognition and interaction between CD44v6 expressed on B16F10 cell membranes and hyaluronic acid on cerebral vascular endothelial cells, and they responsively release 2ME2 by the oxidative stress microenvironment. Notably, BM@TP/2ME2 can scavenge excessive ROS to reestablish redox balance, reverse neuroinflammation, and restore autophagic flux in damaged neurons, eventually exerting a remarkable neuroprotective effect after CA-ROSC in vitro and in vivo. This biomimetic drug delivery system is a novel and promising strategy for the treatment of cerebral ischemia-reperfusion injury after CA-ROSC.

Tumor-infiltrating gamma delta T-cells reveal exhausted subsets with remarkable heterogeneity in colorectal cancer.

The γδT-cells recognize infected or transformed cells. However, unlike αßT-cells, γδT-cells are innate-like immune cells, with no major histocompatibility complex restriction requirements. γδT-cells are the main population of intestinal intraepithelial lymphocytes (IELs) and are associated with the antitumor immune response, particularly in colorectal cancer (CRC). Although CD8+ T-cells exhibit dysfunction and even exhaustion in the tumor microenvironment (TME), which contributes to tumor immune escape, whether the same applies to tumor-infiltrating (TI)-γδT-cells is not completely understood. Here, we sought to investigate the expression pattern of inhibitory receptors and functional state of TI-γδT-cells, and reveal the features of exhausted TI-γδT-cells in the CRC TME. We demonstrated that TI-γδT-cells exhibited exhaustion phenotypes and displayed more severe functional exhaustion than TI-CD8+ T-cells or NK-cells in the TME of CRC. In addition, scRNA-seq analysis of TI-γδT-cells revealed three exhausted subsets with remarkable heterogeneity. The presence of three heterogeneous exhausted γδT-cell (Tex) populations, including Texprog , Textran and Texterm were further confirmed by flow cytometry, on the basis of PD-1 and TIM-3 expression. Finally, we revealed that c-Maf not only contributed to γδT-cell exhaustion via upregulation of inhibitory receptors, but also involved in the exhaustion of CD8+ T and NK-cells. c-Maf may also be an important contributor to γδT-cell exhaustion in CRC patients. These findings indicated that TI-γδT-cells exhibit phenotypic and functional exhaustion in the CRC TME. The revealed features of exhausted TI-γδT-cells may provide help for understanding the mechanisms and the association of γδT-cell exhaustion with tumor development and pathogenesis.

Cell membrane derived liposomes loaded with DNase I target neutrophil extracellular traps which inhibits colorectal cancer liver metastases.

Neutrophil extracellular traps (NETs) are web-like chromatin structures that are coated with granule proteins and trap microorganisms. However, NETs can damage the host tissue, contribute to the development of autoimmunity and lead to other dysfunctional outcomes in noninfectious diseases, including systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), diabetes, atherosclerosis, vasculitis, thrombosis, and cancer. As a potential therapeutic approach, targeted ablation of neutrophil extracellular traps is of utmost importance for the treatment of NET-associated diseases. Here, the specific interaction between CCDC25 and NETs was exploited to produce biomimetic CCDC25-overexpressing cell membrane hybrid liposomes capable of targeting NETs in NET-associated diseases. The hybrid liposomes were constructed by fusing cell membrane nanovesicles derived from genetically engineered cells, which stably express CCDC25, and the resulting cell membrane hybrid liposomes exhibited enhanced affinity for NETs in two different NET-associated disease models. Furthermore, after encapsulation of DNase I in the liposomes, the nanoformulation efficiently eliminated NETs and significantly suppressed the recruitment of neutrophils. Overall, we present a bionic nanocarrier that specifically targets NETs in vivo and successfully inhibits colorectal cancer liver metastases; importantly, this could be a promising therapeutic approach for the treatment of NET-associated diseases.

Trojan Horse Nanocapsule Enabled In Situ Modulation of the Phenotypic Conversion of Th17 Cells to Treg Cells for the Treatment of Multiple Sclerosis in Mice.

Th17/Treg imbalance is closely related to the occurrence and development of multiple sclerosis (MS), and the transdifferentiation of Th17 cells into Treg cells may contribute to the resolution of inflammation, presenting a therapeutic strategy for MS. To modulate this phenotypic shift in situ, a "Trojan horse"-like hybrid system, nanocapsule-coupled Th17 cells, is reported for MS treatment. Following intravenous injection into MS mice, the hybrid system efficiently transmigrates across the blood-brain barrier and homes to the inflamed MS niche. (Aminooxy)-acetic acid, a transdifferentiation inducer, is locally released upon the production of ROS and in turn taken up by Th17 cells. It is demonstrated that the Trojan horse hybrid system enables in situ phenotypic transdifferentiation of Th17 cells into anti-inflammatory Treg cells. This phenotypic conversion leads to a domino-like immune response that is conducive to MS therapy. Overall, this work highlights a new pathway for accurate modulation of the phenotypes of adoptively transferred cells in situ, from proinflammatory to anti-inflammatory for MS therapy, and may be broadly applicable for patients suffering from other autoimmune diseases.

Reflection symmetry detection using locally affine invariant edge correspondence.

Reflection symmetry detection receives increasing attentions in recent years. The state-of-the-art algorithms mainly use the matching of intensity-based features (such as the SIFT) within a single image to find symmetry axes. This paper proposes a novel approach by establishing the correspondence of locally affine invariant edge-based features, which are superior to the intensity based in the aspects that it is insensitive to illumination variations, and applicable to textureless objects. The locally affine invariance is achieved by simple linear algebra for efficient and robust computations, making the algorithm suitable for detections under object distortions like perspective projection. Commonly used edge detectors and a voting process are, respectively, used before and after the edge description and matching steps to form a complete reflection detection pipeline. Experiments are performed using synthetic and real-world images with both multiple and single reflection symmetry axis. The test results are compared with existing algorithms to validate the proposed method.

Scanning-tunneling microscope imaging of single-electron solitons in a material with incommensurate charge-density waves.

We report on scanning-tunneling microscopy experiments in a charge-density wave (CDW) system allowing visually capturing and studying in detail the individual solitons corresponding to the self-trapping of just one electron. This "Amplitude Soliton" is marked by vanishing of the CDW amplitude and by the π shift of its phase. It might be the realization of the spinon--the long-sought particle (along with the holon) in the study of science of strongly correlated electronic systems. As a distinct feature we also observe one-dimensional Friedel oscillations superimposed on the CDW which develop independently of solitons.

Surface charge density wave phase transition in NbSe3.

The two charge-density wave (CDW) transitions in NbSe3 were investigated by scanning tunneling microscopy (STM) on an in situ cleaved (b, c) plane. The temperature dependence of first-order CDW satellite spots, obtained from the Fourier transform of the STM images, was measured between 5 and 140 K to extract the surface critical temperatures (T{s}). The low-T CDW transition occurs at T{2s}=70-75 K, more than 15 K above the bulk T{2b}=59 K while at exactly the same wave number. A plausible mechanism for such an unusually high surface enhancement is a softening of transverse phonon modes involved in the CDW formation. The regime of 2D fluctuations is analyzed according to a Berezinskii-Kosterlitz-Thouless type of surface transition, expected for this incommensurate 2D CDW, by extracting the temperature dependence of the order parameter correlation functions.

Direct measurement of the binding energy and bohr radius of a single hydrogenic defect in a semiconductor quantum well.

Low-temperature scanning tunneling spectroscopy under ultrahigh vacuum was used to study donor point defects located at the epitaxial surface of an In(0.53)Ga(0.47)As quantum well. The electronic local density of states was measured with nanoscale resolution in the vicinity of single defects. In this way, both the binding energy and the Bohr radius of the defects could be determined. The binding energy and the Bohr radius were found to be functions of the quantum well thickness, in quantitative agreement with variational calculations of hydrogenic impurity states.