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Dr. Xi  Zhu  Md image

Dr. Xi Zhu Md

2817 Saint Johns Blvd
Joplin MO 64804
417 812-2727
Medical School: Other - 1982
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: 2001007788
NPI: 1275500530
Taxonomy Codes:
207L00000X 207LA0401X 207LC0200X 207LP2900X

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Publications

Exendin-4 Loaded Nanoparticles with a Lipid Shell and Aqueous Core Containing Micelles for Enhanced Intestinal Absorption. - Journal of biomedical nanotechnology
The purpose of this study was to formulate nanoparticles with an elaborate structure for oral delivery of exendin-4 using a simple preparation process. The nanoparticles possessed a mixed lipid shell and an aqueous core which contained drug-loaded micelles. Formulation was optimized by a central composite design and the structure of the nanoparticles was validated. The efficacy for delivery of exendin-4 was evaluated both in vitro and in vivo. The drug encapsulation efficiency of the nanoparticles reached 97.7%. The nanoparticles greatly enhanced the cellular uptake and transport of encapsulated exendin-4 in vitro. The in situ study showed that exendin-4 could be transported across the epithelium into intestinal capillaries, while the lipid materials largely remained in the epithelium. Pharmacodynamic studies in diabetic KKAy mice demonstrated that the exendin-4-loaded nanoparticles exhibited a marked hypoglycemia effect with a pharmacological availability of 12.7% after intestinal administration.
A bio-inspired sensor coupled with a bio-bar code and hybridization chain reaction for Hg(2+) assay. - Chemical communications (Cambridge, England)
In this article, a bio-inspired DNA sensor is developed, which is coupled with a bio-bar code and hybridization chain reaction. This bio-inspired sensor has a high sensitivity toward Hg(2+), and has been used to assay Hg(2+) in the extraction of Bauhinia championi with good satisfaction.
Prostate Tumor Overexpressed 1 (PTOV1) Is a Novel Prognostic Marker for Nasopharyngeal Carcinoma Progression and Poor Survival Outcomes. - PloS one
Prostate tumor overexpressed 1 (PTOV1) has been reported to contribute to increased cancer proliferation. However, the clinical significance of PTOV1 in the development and progression of nasopharyngeal carcinoma (NPC) is unclear. Our study aimed to investigate the expression pattern of PTOV1 in NPC and its correlation with clinicopathological features of patients.Western blotting and real-time PCR were conducted to examine PTOV1 expression levels in NPC cell lines and biopsy tissues compared with normal controls. Immunohistochemistry (IHC) was performed to analyze PTOV1 protein expression in paraffin-embedded tissues from 123 patients. Statistical analyses were applied to evaluate the clinical significance of PTOV1 expression.PTOV1 mRNA and protein levels were upregulated in NPC cell lines and clinical samples. IHC analyses showed that PTOV1 was highly expressed in 68 (55.3%) of 123 NPC specimens. Statistical analysis revealed that PTOV1 expression was significantly correlated with clinical stage (P < 0.001), T classification (P = 0.042) and N classification (P = 0.001). Patients with a higher PTOV1 expression had shorter overall survival compared with those with a lower PTOV1 expression level, especially in lower N stage patients. Multivariate analyses suggested that PTOV1 expression was an independent prognostic marker for survival in NPC patients.Our data demonstrated that PTOV1 overexpression is associated with poor survival outcomes of NPC patients, especially in N0-1 patients. Hence, PTOV1 may help to detect early lymph node metastasis of NPC patients and serve as an independent prognostic biomarker for human NPC.
Computed and Experimental Absorption Spectra of the Perovskite CH3NH3PbI3. - The journal of physical chemistry letters
Electronic structure and light absorption properties of the perovskite CH3NH3PbI3 are investigated by relativistic density functional theory with quasiparticle GW corrections and many-body interactions. The nature of the Wannier exciton is studied by solving the Bethe-Salpeter equation augmented with the analysis of a conceptual hydrogen-like model. The computed absorption spectrum unravels a remarkable absorption "gap" between the first two absorption peaks. This discontinuity is maintained in the calculated tetragonal structure that, however, is not stable at low temperature. Most importantly, the discontinuity is also observed in the experimental absorption spectrum of the orthorhombic single crystal at low temperature (4 K). However, in contrast to the single crystal, in a polycrystalline perovskite film at 5 K the "gap" is filled by a monotonously increasing absorption throughout the visible range. This feature of thin films points to the potential significance of defect absorption for the excellent light harvesting properties of perovskite-based solar cells.
E7ffect of critical care pharmacist's intervention on medication errors: A systematic review and meta-analysis of observational studies. - Journal of critical care
Pharmacists are integral members of the multidisciplinary team for critically ill patients. Multiple nonrandomized controlled studies have evaluated the outcomes of pharmacist interventions in the intensive care unit (ICU). This systematic review focuses on controlled clinical trials evaluating the effect of pharmacist intervention on medication errors (MEs) in ICU settings. Two independent reviewers searched Medline, Embase, and Cochrane databases. The inclusion criteria were nonrandomized controlled studies that evaluated the effect of pharmacist services vs no intervention on ME rates in ICU settings. Four studies were included in the meta-analysis. Results suggest that pharmacist intervention has no significant contribution to reducing general MEs, although pharmacist intervention may significantly reduce preventable adverse drug events and prescribing errors. This meta-analysis highlights the need for high-quality studies to examine the effect of the critical care pharmacist.Copyright © 2015. Published by Elsevier Inc.
A novel ligand conjugated nanoparticles for oral insulin delivery. - Drug delivery
In order to enhance the interaction between nanocarrier and gastrointestinal epithelial cells, we developed nanoparticles (NPs) modified with targeting ligand FQSIYPpIK (FQS), which specifically interact with integrin αvβ3 receptor expressing on the intestinal epithelium. The targeting NPs were prepared by coating the insulin-loaded poly(lactide-co-glycolide)-monomethoxy-poly(polyethylene glycol) micelle cores with FQS modified trimethyl chitosan chloride. In in vitro study, the fabricated NPs showed ameliorated drug release profile and improved enzymatic stability compared with micelles alone. In the integrin αvβ3 receptor over-expressed Caco-2 cells model, FQS modified NPs exhibited significantly accelerated intracellular uptake due to the active ligand-receptor mediation. Meanwhile, the targeting NPs also showed enhanced transport across the Caco-2 monolayer cells via both transcellular and paracellular pathways. Besides, orally administered FQS modified NPs produced a prominent hypoglycemic response and an increase of the serum insulin concentration in diabetic rats. Both in vitro and in vivo results demonstrated the FQS peptide modified NPs as promising intestinal cell-targeting nanocarriers for efficient oral delivery of insulin.
Efficient Peroral Delivery of Insulin via Vitamin B12 Modified Trimethyl Chitosan Nanoparticles. - Journal of pharmacy & pharmaceutical sciences : a publication of the Canadian Society for Pharmaceutical Sciences, Société canadienne des sciences pharmaceutiques
We investigated the effect of vitamin B12 (VB12) modification on the insulin absorption from trimethyl chitosan(TMC) nanoparticles (NPs) under the influence of mucus.TMC and TMC-VB12 were synthesized and insulin loaded TMC/TMC-VB12 nanoparticles were prepared and characterized. Modified and unmodified nanoparticles were studied with Caco-2/HT29-MTX cell model and ligated rat ileum loop.Compared with unmodified NPs, VB12 modified NPs showed significantly higher drug internalization in Caco-2/HT29-MTX cell model. The internalization mechanism via VB12 mediation included caveolae and clathrin-mediated endocytosis pathway. Meanwhile, an increased transportation of drugs was observed for VB12 modified NPs, possibly due to the ligand-receptor interaction via an intrinsic factor-dependent fashion. Although the uptake and transport of VB12 modified NPs could be partially influenced by mucus, they still showed higher drug permeation through Caco-2/HT29-MTX co-cultured cells than unmodified NPs in the presence or absence of mucus. Moreover, in situ study in ligated rat ileum loop demonstrated that VB12 modified nanoparticles could reduce the residual insulin in intestinal lumen (0.59 times) and increase their absorption in epithelial tissue (4.8 times) compared with the unmodified ones.VB12 modified trimethyl chitosan nanoparticle is a promising carrier for peroral delivery of insulin. This article is open to POST-PUBLICATION REVIEW. Registered readers (see "For Readers") may comment by clicking on ABSTRACT on the issue's contents page.
A smart polymeric platform for multistage nucleus-targeted anticancer drug delivery. - Biomaterials
Tumor cell nucleus-targeted delivery of antitumor agents is of great interest in cancer therapy, since the nucleus is one of the most frequent targets of drug action. Here we report a smart polymeric conjugate platform, which utilizes stimulus-responsive strategies to achieve multistage nuclear drug delivery upon systemic administration. The conjugates composed of a backbone based on N-(2-hydroxypropyl) methacrylamide (HPMA) copolymer and detachable nucleus transport sub-units that sensitive to lysosomal enzyme. The sub-units possess a biforked structure with one end conjugated with the model drug, H1 peptide, and the other end conjugated with a novel pH-responsive targeting peptide (R8NLS) that combining the strength of cell penetrating peptide and nuclear localization sequence. The conjugates exhibited prolonged circulation time and excellent tumor homing ability. And the activation of R8NLS in acidic tumor microenvironment facilitated tissue penetration and cellular internalization. Once internalized into the cell, the sub-units were unleashed for nuclear transport through nuclear pore complex. The unique features resulted in 50-fold increase of nuclear drug accumulation relative to the original polymer-drug conjugates in vitro, and excellent in vivo nuclear drug delivery efficiency. Our report provides a strategy in systemic nuclear drug delivery by combining the microenvironment-responsive structure and detachable sub-units.Copyright © 2015 Elsevier Ltd. All rights reserved.
hCINAP negatively regulates NF-κB signaling by recruiting the phosphatase PP1 to deactivate IKK complex. - Journal of molecular cell biology
Tight regulation of nuclear factor-κB (NF-κB) signaling is essential to maintain homeostasis in immune system in response to various stimuli, which has been studied extensively and deeply. However, the molecular mechanisms responsible for its negative regulation are not completely understood. Here we demonstrate that human coilin-interacting nuclear ATPase protein (hCINAP) is a novel negative regulator in NF-κB signaling by deactivating IκB kinase (IKK) complex. In response to TNF stimulation, hCINAP dynamically associates with IKKα and IKKβ and inhibits IKK phosphorylation. Notably, hCINAP directly interacts with the catalytic subunits of protein phosphatase 1 (PP1) and mediates the formation of IKK-hCINAP-PP1 complex, serving as an adaptor protein that recruits PP1 to dephosphorylate IKK. Furthermore, decreased levels of hCINAP are observed in several inflammatory diseases with NF-κB hyperactivity. Our study suggests a novel mechanism underlying deactivation of IKK and provides new insight into the negative regulation of NF-κB signaling.© The Author (2015). Published by Oxford University Press on behalf of Journal of Molecular Cell Biology, IBCB, SIBS, CAS. All rights reserved.
[Prognostic factors of postoperative stroke in general and orthopedic surgeries: a nested case-control study]. - Zhonghua yi xue za zhi
To evaluate the prognostic factors of postoperative stroke in general and orthopedic surgeries using a nested case-control design.The retrieval of information was performed from the medical records database in the Peking University Third Hospital. A total of 596 records with stroke diagnosis from January 2009 to December 2011 were recruited as the study cases, among which 29 cases were diagnosed with stroke occurred postoperatively. 174 cases with similar surgical types, date of operation and anesthesia technique were explored as control group according to the principle of the nested case-control design. The data were analyzed using Logistic regression model.Univariate analysis showed that age, hypertension, diabetes, stroke or TIA history, non-atrial arrhythmias during surgery were prognostic factors for postoperative stroke. Logistic regression analysis showed that patients with stroke or TIA history, atrial fibrillation and age were independent prognostic factors for postoperative stroke, stroke or TIA history were the most significant factor associated with postoperative stroke (OR=13.01), followed by atrial fibrillation (OR=7.77) and age (OR=6.40).Stroke or TIA history, atrial fibrillation, and age are independent prognostic factors for postoperative stroke. Hypertension, diabetes, and non-atrial arrhythmias during surgery are prognostic factors for postoperative stroke.

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