Subgraph Learning for Topological Geolocalization with Graph Neural Networks.

One of the challenges of spatial cognition, such as self-localization and navigation, is to develop an efficient learning approach capable of mimicking human ability. This paper proposes a novel approach for topological geolocalization on the map using motion trajectory and graph neural networks. Specifically, our learning method learns an embedding of the motion trajectory encoded as a path subgraph where the node and edge represent turning direction and relative distance information by training a graph neural network. We formulate the subgraph learning as a multi-class classification problem in which the output node IDs are interpreted as the object's location on the map. After training using three map datasets with small, medium, and large sizes, the node localization tests on simulated trajectories generated from the map show 93.61%, 95.33%, and 87.50% accuracy, respectively. We also demonstrate similar accuracy for our approach on actual trajectories generated by visual-inertial odometry. The key benefits of our approach are as follows: (1) we take advantage of the powerful graph-modeling ability of neural graph networks, (2) it only requires a map in the form of a 2D graph, and (3) it only requires an affordable sensor that generates relative motion trajectory.

Exploration of Noninvasive Detection of Advanced Glycation End Products in the Lens to Screen for Diabetic Kidney Disease.

Diabetic kidney disease (DKD) is a complication of diabetes, which is the most common cause of end-stage renal disease (dialysis). DKD has a high mortality rate, and only early detection can nip this disease in the bud. Advanced glycation end products (AGEs)are generally believed to be involved in the occurrence of DKD. Studies have shown that the lens AGEs fluorescence for noninvasive detection has high consistency with the gold standard OGTT, has high sensitivity and specificity, and could be used as a practical tool for the early screening of type 2 diabetes mellitus (T2DM).Therefore, we speculated that the noninvasive lens AGEs fluorescence detection method can be used to predict the occurrence of DKD. This study detected levels of AGEs in multiple cellular and tissues and analyzed the relationships between AGEs and lens, eyeballs, peripheral blood mononuclear cell (PBMC), serum, and kidney. Additionally, we examined the possible role of lens AGEs fluorescence in DKD screening. Our preexperimental study found that lens AGE levels in patients with T2DM were positively correlated with PBM and serum AGE levels. Lens AGE levels in patients with T2DM were negatively correlated with eGFR and positively correlated with urinary ACR. The animal and cell experiments showed that the AGE levels in the eyeballs of DM mice were also positively correlated with those in the serum and kidney. To increase the reliability of the experiment, we increased the sample size. In our results, lens AGEs levels were positively correlated with the occurrence of DKD, and the incidence of DKD in the high lens AGEs group was 2.739 times that in the low lens AGEs group. The receiver operating characteristic (ROC) curves showed that patients with T2DM with a lens AGEs value ≥ 0.306 were likely to have DKD. The area under the ROC curve of the noninvasive technique for identifying DKD was 0.757 (95% Cl: 0.677-0.838, p<0.001), and the sensitivity and specificity were 70.0% and 78.7%, respectively. These results suggest that noninvasive lens AGEs detection technology has certain clinical value in diagnosing whether patients with T2DM have DKD.

Full length genome sequencing and phylogenetic analysis of two strains of Getah virus / 中国热带医学

@#Abstract: Objective　The main aim of the study is to sequence the complete genome of two Getah virus strains (GS11-155 and HNDZ1712-1) isolated in Gansu Province and Hainan Province in 2011 and 2017 respectively and analyze the molecular and genetic evolution of the two strains compared with M1, which was first isolated in 1964 in Hainan Province, China. Methods　Genome of two newly isolated Getah viruses were sequenced by virus gene amplification technique, and the genomic database of Getah viruses was established. The molecular characteristics and genetic evolution of the viruses were analyzed by bioinformatics software. Results　The genome length of two new isolated Getah virus strains (GS11-155 and HNDZ1712-1) was 11 690 nt and 11 621 nt, respectively. Both strains had the structural characteristics of Alphavirus genome. Although the nucleotide sequence lengths of structural genes, non-structural genes and non-coding junction regions of the two strains were identical, the nucleotide sequence lengths of the 5' and 3' non-coding regions of the viral genomes were a few different. The 3'UTR repeats elements in the genomes of the two virus strains did not change. It was 97.7% and 98.1% different of nucleotide and amino acid homology between both strains of Getah virus, HNDZ1712-1 isolated in 2017 and M1 isolated in 1964 in Hainan Province. Interesting, Gansu 2011 cluster and Hainan 2017 cluster were emerged leading by both strains GS11-155 and HNDZ1712-1 respectively, those two clusters totally independent with M1 virus isolated from Hainan in 1964 in whole genome phylogenetic analysis first. Conclusions　Although the HNDZ1712-1 was also isolated from mosquito samples in Hainan Province, it was in a completely different evolutionary branch from the M1 isolated from Hainan Island in 1964, and was closely related to the strain isolated from Gansu Province (GS11-155) thousands of kilometers away. It is suggested that the two new strains of Getah virus are different from the Getah virus isolated in 1964.

Outbreak of Haff Disease along the Yangtze River, Anhui Province, China, 2016.

We investigated a large outbreak of Haff disease that occurred along the Yangtze River in Anhui Province, China, in 2016. Of the 672 cases identified during the outbreak, 83.3% (560/672) occurred in Wuhu and Ma'anshan. Patients experienced myalgia (100%) and muscle weakness (54.7%). The mean value of myoglobin was 330 + 121.2 ng/mL and of serum creatine kinase 5,439.2 + 4,765.1 U/L. Eating crayfish was the only common exposure among all cases; 96.8% (240/248) of implicated crayfish were caught on the shores of the Yangtze River or its connected ditches. Mean incubation period was 6.2 + 3.8 hours. This case-control study demonstrated that eating the liver of crayfish and eating a large quantity of crayfish were associated with an increased risk for Haff disease. The seasonal increases in crayfish population along the Yangtze River might explain the seasonal outbreaks of Haff disease.

Galactosylated chitosan/5-fluorouracil nanoparticles inhibit mouse hepatic cancer growth and its side effects.

AIM: To observe the curative effect of galactosylated chitosan (GC)/5-fluorouracil (5-FU) nanoparticles in liver caner mice and its side effects. METHODS: The GC/5-FU nanoparticle is a nanomaterial made by coupling GC and 5-FU. The release experiment was performed in vitro. The orthotropic liver cancer mouse models were established and divided into control, GC, 5-FU and GC/5-FU groups. Mice in the control and GC group received an intravenous injection of 200 µL saline and GC, respectively. Mice in the 5-FU and GC/5-FU groups received 200 µL (containing 0.371 mg 5-FU) 5-FU and GC/5-FU, respectively. The tumor weight and survival time were observed. The cell cycle and apoptosis in tumor tissues were monitored by flow cytometry. The expression of p53, Bax, Bcl-2, caspase-3 and poly adenosine 50-diphosphate-ribose polymerase 1 (PARP-1) was detected by immunohistochemistry, reverse transcription-polymerase chain reaction and Western blot. The serum blood biochemical parameters and cytotoxic activity of natural killer (NK) cell and cytotoxicity T lymphocyte (CTL) were measured. RESULTS: The GC/5-FU nanoparticle is a sustained release system. The drug loading was 6.12% ± 1.36%, the encapsulation efficiency was 81.82% ± 5.32%, and the Zeta potential was 10.34 ± 1.43 mV. The tumor weight in the GC/5-FU group (0.4361 ± 0.1153 g vs 1.5801 ± 0.2821 g, P < 0.001) and the 5-FU (0.7932 ± 0.1283 g vs 1.5801 ± 0.2821 g, P < 0.001) was significantly lower than that in the control group; GC/5-FU treatment can significantly lower the tumor weight (0.4361 ± 0.1153 g vs 0.7932 ± 0.1283 g, P < 0.001), and the longest median survival time was seen in the GC/5-FU group, compared with the control (12 d vs 30 d, P < 0.001), GC (13 d vs 30 d, P < 0.001) and 5-FU groups (17 d vs 30 d, P < 0.001). Flow cytometry revealed that compared with the control, GC/5-FU caused a higher rate of G0-G1 arrest (52.79% ± 13.42% vs 23.92% ± 9.09%, P = 0.014 ) and apoptosis (2.55% ± 1.10% vs 11.13% ± 11.73%, P < 0.001) in hepatic cancer cells. Analysis of the apoptosis pathways showed that GC/5-FU upregulated the expression of p53 at both the protein and the mRNA levels, which in turn lowered the ratio of Bcl-2/Bax expression; this led to the release of cytochrome C into the cytosol from the mitochondria and the subsequent activation of caspase-3. Upregulation of caspase-3 expression decreased the PARP-1 at both the mRNA and the protein levels, which contributed to apoptosis. 5-FU increased the levels of aspartate aminotransferase and alanine aminotransferase, and decreased the numbers of platelet, white blood cell and lymphocyte and cytotoxic activities of CTL and NK cells, however, there were no such side effects in the GC/5-FU group. CONCLUSION: GC/5-FU nanoparticles can significantly inhibit the growth of liver cancer in mice via the p53 apoptosis pathway, and relieve the side effects and immunosuppression of 5-FU.

[Construction of recombinant plasmid pIRES-GM-CSF-IL-21 and its therapeutic effect on orthotopically transplanted liver cancer in mice].

OBJECTIVE: To construct a recombinant plasmid pIRES-GM-CSF-IL-21, and to investigate its antitumor effect on tumors in the mice. METHODS: Fifty Bal b/c mice were included in this study. Cultured hepatoma H22 cells were inoculated in the left lobe of the liver to develop orthotopically transplanted liver tumor models. The mice with orthotopically transplanted liver tumor were randomly divided into 5 groups (n = 10): (1) Each mouse received injection of recombinant plasmid pIRES-GM-CSF-IL-21; (2) Received injection of plasmid pIRES-GM-CSF; (3) pIRES-IL-21; (4) Received injection of ampty plasmid pIRES (H22/neo group); (5) Received injection of PBS (H22 group) via the tail vein, respectively. Therefore, the anti-tumor effect was induced by both GM-CSF and IL-21, or by either of them alone. The serum levels of IFN-γ and IL-2 were detected by ELISA, and the cytotoxicity of spleen NK and CTL cells were tested by MTT colorimetry. RESULTS: Comparing with the H22 and H22/Neo groups, the tumor weight in the mice of H22/GM-CSF group was (0.603 ± 0.223) g, H22/IL21-treated group (0.583 ± 0.290) g and H22/GM-CSF-IL21-treated group (0.303 ± 0.323) g, significantly lower than that in the H22 group [(1.591 ± 0.280) g] and H22/Neo group [(1.489 ± 0.155) g]. Among them the tumor growth was most significantly inhibited in the H22/GM-CSF-IL-21 group (0.303 ± 0.323) g, compared with that of H22 and H22/neo groups (P < 0.01). But there was no significant difference between the tumor weights of the H22/GM-CSF group and H22/IL-21 group, and between the tumor weights of the H22 and H22/Neo groups (P > 0.05). The levels of IFN-γ and IL-2 in peripheral blood of mouse models treated with H22/GM-CSF-IL-21 were significantly increased than that in the H22/GM-CSF group and H22/IL-21 group (all P < 0.01), but significantly decreased in the H22group and H22/Neo group (P < 0.01). The anti-tumor activity of splenic NK cells and CTLs in the H22/GM-CSF-IL21 group was significantly enhanced (P < 0.01), compared with the significantly decreased in the H22 and H22/Neo groups. CONCLUSIONS: Our results demonstrate apparent antitumor effect of the plasmid pIRES-GM-CSF-IL-21 on the orthotopically transplanted liver tumor in mice. The combination of both pIRES-GM-CSF and IL-21 is more effective than that of pIRES/IL21 or pIRES/GM-CSF treatment alone. In addition, the plasmid pIRES-GM-CSF-IL-21 can also promote the secretion of IFN-γ and IL-2 in vivo, and enhance the cytotoxic activity of splenic NK and CTLs against the transplanted liver tumor.

Mutation analysis in a Chinese family with multiple endocrine neoplasia type 1.

BACKGROUND: Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant cancer syndrome which is caused by germline mutations of the tumor suppressor gene MEN1. This study aimed to identify mutations in a Chinese pedigree with MEN1. METHODS: A large Chinese family with MEN1 was collected. All of the coded regions and their adjacent sequences of the MEN1 gene were amplified and sequenced. RESULTS: In this family, a heterozygous cytosine insertion in exon 10 (c.1546_1547insC) inducing a frame shift mutation of MEN1 was found in the proband and the other two suffering members of his family. This mutation was linked to a novel single nucleotide polymorphism (SNP) in intron 3 (IVS3 + 18C > T). CONCLUSIONS: The mutation in exon 10 of MEN1 gene might induce development of parathyroid hyperplasia and pituitary adenoma and cosegregate with MEN1 syndrome. The significance of the new found IVS3 + 18C > T of MEN1 needs a further investigation.