An Auger electron-loaded theranostic biosensor triggered by the ACE2-mediated virus/host endocytosis.

Accurate diagnosis and effective antiviral strategies are critical to combat acute infection and to avoid damage to the host. Due to their restricted radiation range and energy, Auger electron emitters have shown potential as a RNA-destructing radionuclide therapy in oncology and infection. Focusing on the process of angiotensin-converting enzyme 2 (ACE2)-mediated endocytosis, Technetium-99m-labeled DX600 (Tc-DX600) was synthesized as an Auger electron vector to specifically bind to surface-expressed ACE2 proteins on 293T-hACE2 cells (293T cells stably expressing human ACE2), and Technetium-99m-loaded microvesicles (Tc-MVs) served as an antiviral tracer and effector in pseudovirus infection.

An ACE2 PET imaging agent derived from F/Cl exchange of MLN-4760 under phase transfer catalysis.

Background: Angiotensin-converting enzyme-2 (ACE2) acts as a key regulatory molecule and important therapeutic target in the pathological remodeling of numerous organs and diseases. In this study, a rapid, simple, and efficient synthetic route with a catalytic, F-for-Cl (F/Cl) exchange scheme was designed for the preparation of F-labeled MLN-4760, and its targeting ability was investigated in a humanized ACE2 mouse model.

Results: A novel F-labeled MLN-4760 radioligand, abbreviated as F-MLN-4760, was successfully synthesized by the F/Cl exchange-labeling, and was purified by SepPak C18 columns with a radiochemical yield of 30% and a radiochemical purity of 29.

Exploring the Sustainable Utilization of Deep Eutectic Solvents for Chitin Isolation from Diverse Sources.

Deep eutectic solvents (DES) represent an innovative and environmentally friendly approach for chitin isolation. Chitin is a natural nitrogenous polysaccharide, characterized by its abundance of amino and hydroxyl groups. The hydrogen bond network in DES can disrupt the crystalline structure of chitin, facilitating its isolation from bioresources by dissolving or degrading other components.

Adipose stem cells regulate lipid metabolism by upregulating mitochondrial fatty acid β-oxidation in macrophages to improve the retention rate of transplanted fat.

Background: At present, fat transplantation is widely used in the plastic surgery industry, but the long-term preservation rate of transplanted fat decreases because of complications such as oil cysts due to the inability in macrophages to metabolize absorption. In cell-assisted lipotransfer technology, adipose-derived stem cells (ASCs) can influence the inflammatory response of grafts through the immunoregulation in macrophages, and the lipid metabolism in macrophages plays an important role in this process. Therefore, we hypothesized ASCs could improve the retention rate of fat grafts by regulating the progress of lipid metabolism in macrophages.

[F]AlF-PSMA-11 PET in diagnosing prostate cancer: a head-to-head comparison with [Ga]Ga-PSMA-11 PET and an exploration of dual-phase scanning.

Purpose: To evaluate the physiological distribution and tumour detection ability of [F]AlF-PSMA-11 positron emission tomography (PET) dual-phase scans in patients with prostate cancer (PCa).

Methods: As a retrospective study, clinical and PET data of PCa patients who underwent dual-phase [F]AlF-PSMA-11 PET of routine scan (45-50 min) and delayed scan (120 min) from November 2020 to June 2021 were collected, and physiological and pathological regions of interest were quantified to determine the time-dependent maximum standardized uptake value (SUV) of [F]AlF-PSMA-11. Part of the above subjects who underwent [Ga]Ga-PSMA-11 PET in the following 6 months were included in a head-to-head comparison.

Impact of Respiratory Dust on Health: A Comparison Based on the Toxicity of PM2.5, Silica, and Nanosilica.

Respiratory dust of different particle sizes in the environment causes diverse health effects when entering the human body and makes acute or chronic damage through multiple systems and organs. However, the precise toxic effects and potential mechanisms induced by dust of different particle sizes have not been systematically summarized. In this study, we described the sources and characteristics of three different particle sizes of dust: PM2.

Design, concise synthesis and evaluation of novel amide-based combretastatin A-4 analogues as potent tubulin inhibitors.

As our ongoing work, a novel series of the amide-based CA-4 analogues were successfully designed, synthesized, and explored for their biological evaluation. Among these compounds, 7d and 8a illustrated most potent antiproliferative activity toward A549, HeLa, HCT116, and HT-29 cell lines. Most importantly, these two compounds didn't display noticeable cytotoxic activity on the non-tumoural cell line HEK-293.

[Tc]Tc-labeled cyc-DX600-HYNIC as a SPECT probe for ACE2-specific pancreatic cancer imaging.

As a regulator in renin-angiotensin-aldosterone system, angiotensin-converting enzyme 2 (ACE2) closely correlated with tumor progression of pancreatic cancer, meantime, was easily affected by a variety of factors. [Tc]Tc-cyc-DX600 SPECT was established as an ACE2-specific imaging protocol to figure out the ACE2 status in pancreatic tumor. BALB/C-NU mice were used to prepare the subcutaneous cell derived xenograft (CDX) models with HEK-293T or HEK-293T/hACE2 cells to validate ACE2 specificity of [Tc]Tc-cyc-DX600 SPECT and establish SPECT imaging protocol.

One-day examination of triple nuclear medicine imaging and application in evaluating transarterial embolization.

A diagnosis based on multiple nuclear medicine imaging (NMI) was more comprehensive in approaching the nature of pathological changes. In this research, a method to realize triple NMIs within one day was developed based on the reasonable arrangements of Ga-RGD PET/CT specialized on neovascularization, Tc-HL-91 SPECT/CT specialized on hypoxia and F-FDG PET/CT specialized on tumor metabolism. Feasibility was verified in evaluating the therapeutic effects of transarterial embolization (TAE) performed on rabbit models with VX2 tumor.

DPP4 Regulates the Th17/IL-17 Axis and Accelerates Epithelial Mesenchymal Transition to Promote Ovalbumin-Induced Asthma in Female C57BL/6J Mice.

Background: Dipeptidyl peptidase-4 (DPP4) is a transmembrane glycoprotein, prevalent across a variety of tissues and cells and can be foundin a solubilised in peripheral blood. This paper aims at determining the role of sCD26/sDPP4 in Th17 cell polarization and airway epithelial cell to epithelial mesenchymal transition (EMT) in asthma.

Methods: Female C57BL/6J mice were treated with ovalbumin to constructed asthma mice.

Design, synthesis, and biological evaluation of N-(pyridin-3-yl)pyrimidin-4-amine analogues as novel cyclin-dependent kinase 2 inhibitors for cancer therapy.

The discovery and development of CDK2 inhibitors has currently been validated as a hot topic in cancer therapy. Herein, a series of novel N-(pyridin-3-yl)pyrimidin-4-amine derivatives were designed and synthesized as potent CDK2 inhibitors. Among them, the most promising compound 7l presented a broad antiproliferative efficacy toward diverse cancer cells MV4-11, HT-29, MCF-7, and HeLa with IC values of 0.

HMGB1/RAGE Signaling Regulates Th17/IL-17 and Its Role in Bronchial Epithelial-Mesenchymal Transformation.

Background: Airway remodeling is one of the reasons for severe steroidresistant asthma related to HMGB1/RAGE signaling or Th17 immunity.

Objective: Our study aims to investigate the relationship between the HMGB1/RAGE signaling and the Th17/IL-17 signaling in epithelial-mesenchymal transformation (EMT) of airway remodeling.

Methods: CD4 T lymphocytes were collected from C57 mice.

Radioiodine-131-Labeled Theranostic Nanoparticles for Transarterial Radioembolization and Chemoembolization Combination Therapy of VX2 Liver Tumor.

In interventional treatment, materials are administered into the blood supply artery and directly delivered to tumors, offering proper scenarios for nanomedicine potential clinical applications. Transarterial chemoembolization (TACE) and transarterial radioembolization (TARE) are effective treatment methods for hepatocellular carcinoma (HCC), but postoperative residual tumor may result in intrahepatic recurrence and distant metastasis. The combination therapy of TACE and TARE based on multifunctional nanoparticles (NPs) is expected to overcome the drug resistance in hypoxic tumors and improve the therapeutic effect.

Silk fibroin-based embolic agent for transhepatic artery embolization with multiple therapeutic potentials.

Background: The excellent physicochemical and biomedical properties make silk fibroin (SF) suitable for the development of biomedical materials. In this research, the silk fibroin microspheres (SFMS) were customized in two size ranges, and then carried gold nanoparticles or doxorubicin to evaluate the performance of drug loading and releasing. Embolization efficiency was evaluated in rat caudal artery and rabbit auricular artery, and the in vivo distribution of iodinated SFMS (I/I-SFMS) after embolization of rat hepatic artery was dynamically recorded by SPECT.

From Basic Research to Clinical Practice: Considerations for Treatment Drugs for Silicosis.

Silicosis, characterized by irreversible pulmonary fibrosis, remains a major global public health problem. Nowadays, cumulative studies are focusing on elucidating the pathogenesis of silicosis in order to identify preventive or therapeutic antifibrotic agents. However, the existing research on the mechanism of silica-dust-induced pulmonary fibrosis is only the tip of the iceberg and lags far behind clinical needs.

Nephrotoxicity of immune checkpoint inhibitor combination therapy in patients with advanced renal cell carcinoma: a meta-analysis.

Purpose: Few data are available regarding the nephrotoxicity of immune checkpoint inhibitor (ICI) combination therapy in advanced renal cell carcinoma (RCC). This study aimed to investigate the nephrotoxicity of ICI-based combination therapy versus standard of care sunitinib in patients with advanced RCC.

Methods: We searched Embase/PubMed/Cochrane Library for relevant randomized controlled trials (RCTs).

SPECT Imaging with Tc-99m-Labeled HYNIC-FAPI-04 to Extend the Differential Time Window in Evaluating Tumor Fibrosis.

The so-far used Ga-68- or F-18-labelled tracers are of a relative short time window in differentiating tumor fibrosis. SPECT applicable imaging probe, Tc-HYNIC-FAPI-04, was synthesized and evaluated in tumor cells and animal models of FAP-positive glioma and FAP-negative hepatoma, and then compared with F-FDG or Ga-FAPI-04 PET/CT. The radio-labeling rate of Tc-HYNIC-FAPI-04 was greater than 90%, and the radiochemical purity was >99% after purification with sep-pak C18 column.

Methyl-cpg-binding Domain Protein 2 Silencing Inhibits Th17 Differentiation of CD4+T cells Induced by Ovalbumin.

Background: Little is known about MBD2's epigenetic regulation in the immune pathogenesis of CD4+T cell differentiation.

Objective: This study attempted to explore the mechanism of methyl-cpg-binding domain protein 2 (MBD2) in CD4+T cell differentiation stimulated by environmental allergen ovalbumin (OVA).

Methods: Mononuclear cells were separated from the spleen tissues of male C57BL/6 mice.

The functional views on response of host rabbit post coronavirus vaccination via ACE2 PET.

Molecular imaging can dynamically and quantitatively record the biochemical changes in a systemic view. In this research, SARS-CoV-2 pseudovirus was intramuscularly injected to simulate the vaccination with inactivated virus. New Zealand white rabbits were evaluated with F-FDG PET for inflammation and Ga-cyc-DX600 PET for ACE2 fluctuation, which were performed before and at 3, 7 and 14 days post injection (d P.

ACE2 PET to reveal the dynamic patterns of ACE2 recovery in an infection model with pseudocorona virus.

Due to the COVID-19 pandemic, a series of sequelae, such as fatigue, tachypnea, and ageusia, appeared in long COVID patients, but the pathological basis was still uncertain. The targeted radiopharmaceuticals were of potential to systemically and dynamically trace the pathological changes. For the key ACE2 protein in the virus-host interaction, Ga-cyc-DX600 was developed on the basis of DX600 as a PET tracer of ACE2 fluctuation and maintained the ability in differentiating ACE and ACE2.

Deterioration of Mechanical Properties and the Damage Constitutive Model of Corroded Steel in an Industrial Environment.

To investigate the degradation law of the mechanical properties of corroded steel, the standard specimens from machining steel members in service for 9 years in an industrial environment were subjected to tensile tests. The influences of different degrees and types of corrosion on the fracture path, stress-strain curve, and mechanical properties of specimens were discussed. Finally, the damage constitutive model of corroded steel was established based on the damage mechanics theory.

Application of 3-Dimensional Technology for Evaluating Muscular Type and Muscle-Fat Pad Mixed-Type Nasolabial Folds With Botulinum Toxin-A Treatment.

Background: Botulinum toxin-A (BTX-A) is used in the treatment of nasolabial folds (NLFs). However, lighting and clinician subjectivity play a major role in evaluating the efficacy of this treatment.

Objectives: By applying 3-dimensional (3D) technology, this study aimed to quantitatively evaluate the effects of BTX-A injection on muscular (M) and muscle-fat pad mixed-type (MF) NLFs.