Nanomedicines Promote Cartilage Regeneration in Osteoarthritis by Synergistically Enhancing Chondrogenesis of Mesenchymal Stem Cells and Regulating Inflammatory Environment.

Osteoarthritis (OA) is a degenerative joint disease characterized by progressive erosion of the articular cartilage and inflammation. Mesenchymal stem cells' (MSCs) transplantation in OA treatment is emerging, but its clinical application is still limited by the low efficiency in oriented differentiation. In our study, to improve the therapeutic efficiencies of MSCs in OA treatment by carbonic anhydrase IX (CA9) siRNA (siCA9)-based inflammation regulation and Kartogenin (KGN)-based chondrogenic differentiation, the combination strategy of MSCs and the nanomedicine codelivering KGN and siCA9 (AHK-CaP/siCA9 NPs) was used. In vitro results demonstrated that these NPs could improve the inflammatory microenvironment through repolarization of M1 macrophages to the M2 phenotype by downregulating the expression levels of CA9 mRNA. Meanwhile, these NPs could also enhance the chondrogenesis of bone marrow-derived mesenchymal stem cells (BMSCs) by upregulating the pro-chondrogenic TGF-ß1, ACAN, and Col2α1 mRNA levels. Moreover, in an advanced OA mouse model, compared with BMSCs alone group, the lower synovitis score and OARSI score were found in the group of BMSCs plus AHK-CaP/siCA9 NPs, suggesting that this combination approach could effectively inhibit synovitis and promote cartilage regeneration in OA progression. Therefore, the synchronization of regulating the inflammatory microenvironment through macrophage reprogramming (CA9 gene silencing) and promoting MSCs oriented differentiation through a chondrogenic agent (KGN) may be a potential strategy to maximize the therapeutic efficiency of MSCs for OA treatment.

Meniscus heterogeneity and 3D-printed strategies for engineering anisotropic meniscus.

The meniscus is a fibrocartilaginous tissue of the knee joint that plays an important role in load transmission, shock absorption, joint stability maintenance, and contact stress reduction. Mild meniscal injuries can be treated with simple sutures, whereas severe injuries inevitably require meniscectomy. Meniscectomy destroys the mechanical microenvironment of the knee joint, leading to cartilage degeneration and osteoarthritis. Tissue engineering techniques, as a strategy with diverse sources and customizable and adjustable mechanical and biological properties, have emerged as promising approaches for the treatment of meniscal injuries and are represented by 3D printing. Notably, the heterogeneity of the meniscus, including its anatomical structure, cell phenotype, extracellular matrix, and biomechanical properties, is crucial for its normal function. Therefore, the construction of heterogeneous tissue-engineered menisci (TEM) has become a research hotspot in this field. In this review, we systematically summarize the heterogeneity of menisci and 3D-printed strategies for tissue-engineered anisotropic menisci. The manufacturing techniques, biomaterial combinations, surface functionalization, growth factors, and bioreactors related to 3D-printed strategies are introduced and a promising direction for the future research is proposed.

Guluronic acid can inhibit copper(II) and amyloid - ß peptide coordination and reduce copper-related reactive oxygen species formation associated with Alzheimer's disease.

Copper-related reactive oxygen species (ROS) formation can lead to neuropathologic degradation associated with Alzheimer's disease (AD) according to amyloid cascade hypothesis. A complexing agent that can selectively chelate with copper ions and capture copper ions from the complex formed by copper ions and amyloid-ß (Cu - Aß complex) may be available in reducing ROS formation. Herein, we described applications of guluronic acid (GA), a natural oligosaccharide complexing agent obtained from enzymatic hydrolysis of brown algae, in reducing copper-related ROS formation. UV-vis absorption spectra demonstrated the coordination between GA and Cu(II). Ascorbic acid consumption and coumarin-3-carboxylic acid fluorescence assays confirmed the viability of GA in reducing ROS formation in solutions containing other metal ions and Aß. Fluorescence kinetics, DPPH radical clearance and high resolution X - ray photoelectron spectroscopy results revealed the reductivity of GA. Human liver hepatocellular carcinoma (HepG2) cell viability demonstrated the biocompatibility of GA at concentrations lower than 320 µM. Cytotoxic results of human neuroblastoma (SH-SY5Y) cells verified that GA can inhibit copper-related ROS damage in neuronal cells. Our findings, combined with the advantages of marine drugs, make GA a promising candidate in reducing copper-related ROS formation associated with AD therapy.

Nanomedicines Reprogram Synovial Macrophages by Scavenging Nitric Oxide and Silencing CA9 in Progressive Osteoarthritis.

Osteoarthritis (OA) is a progressive joint disease characterized by inflammation and cartilage destruction, and its progression is closely related to imbalances in the M1/M2 synovial macrophages. A two-pronged strategy for the regulation of intracellular/extracellular nitric oxide (NO) and hydrogen protons for reprogramming M1/M2 synovial macrophages is proposed. The combination of carbonic anhydrase IX (CA9) siRNA and NO scavenger in "two-in-one" nanocarriers (NAHA-CaP/siRNA nanoparticles) is developed for progressive OA therapy by scavenging NO and inhibiting CA9 expression in synovial macrophages. In vitro experiments demonstrate that these NPs can significantly scavenge intracellular NO similar to the levels as those in the normal group and downregulate the expression levels of CA9 mRNA (≈90%), thereby repolarizing the M1 macrophages into the M2 phenotype and increasing the expression levels of pro-chondrogenic TGF-ß1 mRNA (≈1.3-fold), and inhibiting chondrocyte apoptosis. Furthermore, in vivo experiments show that the NPs have great anti-inflammation, cartilage protection and repair effects, thereby effectively alleviating OA progression in both monoiodoacetic acid-induced early and late OA mouse models and a surgical destabilization of medial meniscus-induced OA rat model. Therefore, the siCA9 and NO scavenger "two-in-one" delivery system is a potential and efficient strategy for progressive OA treatment.

An All-Inside Repair Technique for Unstable Type-IV Lateral Meniscal Posterior Root Tear.

Lateral meniscal posterior root tears are defined as tears of meniscus within 9 mm from the bony root attachment. Unrepaired root tears significantly compromise the biomechanical functions of the meniscus, resulting in early and accelerated osteoarthritis. Several authors have described various techniques to reattach the posterior root of the lateral meniscus, and decent short-term results have been observed. Although most previous techniques are capable of repairing radial root tears, difficulties are encountered when repairing oblique type IV tears. In this technique note, the author describes an efficient side-to-side repair technique using the FAST-FIX system, which is practical in repairing the type IV tears of the lateral meniscus. This technique includes certain sequence of the stitches and skills of controlling the root remnant, which makes it easy to penetrate the meniscus and to achieve anatomic repair.

Integrated microRNA and mRNA signatures in peripheral blood lymphocytes of familial epithelial ovarian cancer.

PURPOSE: Characterization of the genetic landscapes of familial ovarian cancer through integrated analysis of microRNA and mRNA by partial least squares (PLS) and Monte Carlo technique based on genome-wide association studies (GWAS). METHODS: The miRNA and mRNA transcriptional data in familial ovarian cancer were characterized from the Gene Expression Omnibus (GEO) database. The miRNA and mRNA expression profiles in peripheral blood lymphocytes (PBLs) of 74 familial ovarian cancer patients and 47 control subjects were analyzed with the integration of partial least squares (PLS) and Monte Carlo techniques. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were also performed. RESULTS: Total of 16 miRNA-mRNA pairs were identified with the target gene prediction results of miRNAs and mRNAs. An innovated miRNA-mRNA integrated network was constructed in which 6 downregulated miRNAs and 1 upregulated miRNAs were included. KEGG and GO pathway enrichment analysis revealed over-representation of dysregulated miRNAs in various biological processes especially in cancer pathology. Hsa-miR-34b played a pivotal role in this network and interacted with other miRNAs. Hsa-miR-136 and hsa-miR-335 were associated with p53 and Erk1/2 pathways and tumor suppressors, such as PTEN. CONCLUSIONS: The results from this research provide insights on miRNA-mRNA networks and offer new tools for studying transcriptional variants in familial ovarian cancer.

Application of 3D printing technology in emergency medical equipment / 医疗卫生装备

The concept and principle of 3D printing technology were described,and its advantages were expounded according to the demands of emergency medical equipment.The application of 3D printing technology in the field of emergency medical equipment was analyzed from six aspects,such as equipment system,disposition model,development and innovation,use-pattern,maintenance methods,comprehensive benefit etc,to provide the references to the future construction and development of emergency medical equipment.It's pointed out 3D,4D and 5D printing technologies were of great significance for driving the development of emergency medical equipment.

Application of 3D printing technology in emergency medical equipment / 医疗卫生装备

The concept and principle of 3D printing technology were described,and its advantages were expounded according to the demands of emergency medical equipment.The application of 3D printing technology in the field of emergency medical equipment was analyzed from six aspects,such as equipment system,disposition model,development and innovation,use-pattern,maintenance methods,comprehensive benefit etc,to provide the references to the future construction and development of emergency medical equipment.It's pointed out 3D,4D and 5D printing technologies were of great significance for driving the development of emergency medical equipment.

STMN1 Promotes Progesterone Production Via StAR Up-regulation in Mouse Granulosa Cells.

Stathmin 1 (STMN1) is a biomarker in several types of neoplasms. It plays an important role in cell cycle progression, mitosis, signal transduction and cell migration. In ovaries, STMN1 is predominantly expressed in granulosa cells (GCs). However, little is known about the role of STMN1 in ovary. In this study, we demonstrated that STMN1 is overexpressed in GCs in patients with polycystic ovary syndrome (PCOS). In mouse primary GCs, the overexpression of STMN1 stimulated progesterone production, whereas knockdown of STMN1 decreased progesterone production. We also found that STMN1 positively regulates the expression of Star (steroidogenic acute regulatory protein) and Cyp11a1 (cytochrome P450 family 11 subfamily A member 1). Promoter and ChIP assays indicated that STMN1 increased the transcriptional activity of Star and Cyp11a1 by binding to their promoter regions. The data suggest that STMN1 mediates the progesterone production by modulating the promoter activity of Star and Cyp11a1. Together, our findings provide novel insights into the molecular mechanisms of STMN1 in ovary GC steroidogenesis. A better understanding of this potential interaction between STMN1 and Star in progesterone biosynthesis in GCs will facilitate the discovery of new therapeutic targets in PCOS.

Midazolam inhibits the proliferation of human head and neck squamous carcinoma cells by downregulating p300 expression.

The objective of this study was to investigate the mechanism of midazolam in inhibiting the proliferation of hypopharyngeal squamous carcinoma cells. Cultured FaDu cancer cells were treated with different concentrations of midazolam. MTT and BrdU incorporation assays were then used to evaluate cancer cell proliferation. The mRNA and protein levels of p300, a key factor involved in the tumorigenesis of numerous cancers, were measured with RT-PCR and Western blotting, respectively. Midazolam inhibited the expression of p300 and the proliferation of FaDu cells. Additionally, knockdown of p300 resulted in increased expression of p21 and p27 and decreased expression of p-Rb while inhibiting the proliferation of FaDu cells. Midazolam inhibits the proliferation of human head and neck squamous carcinoma cells by downregulating p300. Midazolam may be useful for the treatment of hypopharyngeal squamous cancers.

[The clinical characteristics of patients with thymoma-associated myasthenia gravis].

OBJECTIVE: To investigation the clinical characteristics in myasthenia gravis (MG) patients with thymomas. METHODS: A total of 856 MG patients admitted to the department during 2008.7 - 2010.12 were reviewed retrospectively. The patients with MG were divided into two groups based on thymic pathology, which were 162 cases with thymoma and 694 cases without thymoma. We compared the different clinical features including the gender, age of onset, MG symptoms and the incidence rate of myasthenia crisis. And the relationship between the WHO types, Maosaoka stages of thymoma and the severe of MG was also studied. RESULTS: The percentage of thymoma-associated MG patients was 18.9 percent of hospitalized MG patients at the same period. Of the 162 thymoma-associated patients, 94 were male and 68 were female, with a ratio of 1.38:1 and a mean age of (42.9 ± 12.4) years old. Thymoma was more frequent in middle-old aged patients than in children. Compared with non-thymoma MG, more thymomatous patients showed generalised MG, but not only ocular muscles weakness (90.1% vs 62.4%, P < 0.001). There were significant differences of the incidence rate of myasthenic crisis in the two groups (14.8% vs 2.3%). (2) WHO type B2 and Maosaoka I, II thymoma were the commonest types among all potentially MG-associated thymoma. No differences of Osserman MG classification was found in thymomatous patients with different pathologic changes. CONCLUSIONS: The thymomatous MG patients had its distinctive clinical features: thymomas occurred in about 19.7% of MG patients with more men than women, more common in generalized, higher incidence of myasthenia crisis, with B2 type thymic pathology and Maosaoka I, II stages. No correlation was found between pathologic and clinical stages.

[Evaluation of the role of combined TES-MEP and CSEP monitoring during the spinal surgery].

OBJECTIVE: To evaluate of the role of transcranial electrical stimulation motor evoked potential (TES-MEP) in combination with cortical somatosensory evoked potential (CSEP) monitoring during the spinal surgery. METHODS: TES-MEP on bilateral anterior tibial muscle and flexor hallucal brevis and CSEP on bilateral posterior tibial nerve were observed simultaneously on 293 patients during spinal surgery from July 2006 to April 2009. Intravenous anesthesia was employed in all the patients, a part of which were added low dose of sevoflurane or muscle relaxant. The results of TES-MEP, CSEP and combined monitoring were analyzed statistically. Pre-operative and post-operative motor and sensory functions of spinal cord were compared. RESULTS: Success rate of TES-MEP, CSEP and combined monitoring was 90.8%, 96.9% and 100% respectively. For the judgment of motor function of spinal cord, the sensitivity of TES-MEP and CSEP was 100% and 89.3% respectively and the specificity of 98.4% and 96.9%. The Youden index of the two methods was 0.984 and 0.862. For sensory function, the sensitivity of them was 76.7% and 93.3% respectively and the specificity of 98.7% and 98.0%. The Youden index was 0.754 and 0.913. The sensitivity of combined monitoring was 100%, with the specificity of 96.9%. The Youden index was 0.969. CONCLUSIONS: The precision of monitoring motor function of spinal cord with TES-MEP is higher than that with CSEP, however, for sensory function, CSEP is more precise. The sensitivity and precision of combined monitoring for spinal cord function were apparently better than that of unitary TES-MEP or CSEP. The combined TES-MEP and CSEP monitoring is a relatively ideal method.