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PubMed | Beijing Hospital Beijing 100730 and Peking Union Medical College
Type: Journal Article | Journal: International journal of clinical and experimental medicine | Year: 2015

To use Langendorff model to investigate whether remote ischemic preconditioning (RIPC) attenuates post-ischemic mechanical dysfunction on isolated rat heart and to explore possible mechanisms. SD rats were randomly divided into RIPC group, RIPC + norepinephrine (NE) depletion group, RIPC + pertussis toxin (PTX) pretreatment group, ischemia/reperfusion group without treatment (ischemia group) and time control (TC) group. RIPC was achieved through interrupted occlusion of anterior mesenteric artery. Then, Langendorff model was established using routine methods. Heart function was tested; immunohistochemistry and ELISA methods were used to detect various indices related to myocardial injury. Compared with ischemia group in which the hemodynamic parameters deteriorated significantly, heart function recovered to a certain degree among the RIPC, RIPC + NE depletion, and RIPC + PTX groups (P<0.05). More apoptotic nuclei were observed in ischemia group than in the other three groups (P<0.05); more apoptotic nuclei were detected in NE depletion and PTX groups than in RIPC group (P<0.05). While, there was no significant difference between NE depletion and PTX groups. In conclusion, RIPC protection on I/R myocardium extends to the period after hearts are isolated. NE and PTX-sensitive inhibitory G protein might have a role in the protection process.

PubMed | Capital Medical University, Beijing Hospital Beijing 100730 and Peking Union Medical College
Type: Journal Article | Journal: American journal of translational research | Year: 2016

It is a challenge to find a better microorganisms DNA extraction method for samples taken from the lower airways for metagenomic sequencing, as the concentrations of bacteria in the alveoli and small airways are likely considerably less than that of the mouth or lower digestive tract. Background DNA from the host, and extraction biases can significantly interfere with microbiota assessment and increase the cost of sequencing. This study aimed to develop an optimized DNA extraction method, which would enable a higher concentration of microbial DNA to be extracted from the samples.We compared the microbiota profiles of the lower airway communities in twelve individuals with IIP. DNA was extracted using three different extraction methods: QIAamp UCP PurePathogen Blood Kit named kit3 in this study, QIAamp UCP Pathogen Mini Kit named kit2, and QIAamp DNA Microbiome Kit named kit1. DNA libraries were constructed according to the manufacturers instructions (Illumina). The same workflows from Illumina were used to perform cluster generation, template hybridization, isothermal amplification, linearization, blocking, denaturing, and hybridization of the sequencing primers. Raw data was uploaded to MG-RAST v3 and analyzed.A great number of bacterium inhabits the lower airways of patients with IIP, though there is no airway infection. More bacterium was found in mouth or upper airway. DNA concentrations of DNA samples isolated with kit1 with Benzonase were significantly lower than those isolated with the other two kits for BALF and mouthwash samples. Moreover, the ratio of human genome in clean reads of samples isolated with kit1 with Benzonase was remarkably smaller than those isolated with kit2 and kit3. The relative abundance of total bacteria, the total number of taxa, and the relative abundance of taxa in BALF samples as opposed to mouthwash samples with kit1 were significantly higher than for those extracted the other kits.A microbial DNA extraction method with pretreatment of depletion of host nucleic acid by Benzonase can enable a higher yield of microbial DNA from samples with a higher fraction of host cells to be obtained. The lower airways of patients with IIP without airway infection were inhabited by a great number of bacterium.

PubMed | Beijing Hospital Beijing 100730
Type: Journal Article | Journal: International journal of clinical and experimental medicine | Year: 2014

This study aims to investigate the changes of anterior chamber morphology after laser peripheral iridotomy (LPI) in primary angle-closure (PAC) patients using Pentacam.35 normal persons and 35 patients of PAC before and 1 week after neodymium: yttrium: aluminum garnet (Nd: YAG) LPI were evaluated with Pentacam. We measured the anterior chamber angle (ACA), central anterior chamber depth (CACD), peripheral anterior chamber depth (PACD), anterior chamber volume (ACV) and pupil diameter (PD). Paired t-test was used to investigate the differences in anterior segment parameters before and after LPI. Independent samples t-test was used to compare these parameters between PAC patients after LPI and normal persons.There were significant differences between PAC patients and control in nasal and temporal ACA, PACD, ACV (P < 0.05) except for superior (P = 0.053) and inferior ACA (P = 0.389), CACD (P = 0.453) and PD (P = 0.221). ACV increased 56.5% in PAC patients after LPI whose ACV < 57 mm(3), which was more greatly than those patients whose ACV > 57 mm(3) (P = 0.001).The changes of anterior chamber parameters after LPI in PAC eyes can be demonstrated by Pentacam objectively and quantitatively. LPI seems more effective for PAC eyes with smaller ACV. The anterior chamber parameters in PAC eyes after LPI are still significantly smaller than those of normal persons.

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