Acetates ; Chemical Industry ; statistics & numerical data ; China ; Occupational Exposure ; prevention & control

Objective To evaluate the effect of dexmedetomidine on noise-induced hearing loss in guinea pigs.Methods Twenty-four adult male guinea pigs,aged 3 months,weighing 400-500 g,were randomly divided into 3 groups (n =8 each) using a random number table:dexmedetomdine group (group D),noise-induced hearing loss group (group N) and dexmedetomidine + noise-induced hearing loss group (group DN).A loading dose of dexmedetomidine 5 μg/kg was infused over 5 min,followed by 135 min of infusion at a rate of 10 μg· kg-1 · h-1.The equal volume of normal saline was infused in group N.Groups N and DN were exposed to noise of 4 kHz center frequency and 118-122 dB SPL for 120 min starting from 20 min of administration.Mean arterial pressure (MAP) and cochlear blood flow (COBF) were recorded before administration and every 5 min during drug administration.The changing rate of COBF was calculated.Arterial blood samples were collected for determination of plasma concentration of noradrenaline (NE) by high performance liquid chromatography at 20 and 140 min of administration.Auditory brainstem response (ABR) threshold was recorded before administration and at 1 and 72 h and 10 days after the end of administration.Results Compared with group N,MAP was significantly decreased,the changing rate of COBF was increased at 5-10 min and 30-140 min of administration,ABR threshold was decreased at 1 and 72 h and 10 days after the end of administration,and the plasma concentration of NE was decreased at 140 min of administration in D + N group (P ＜ 0.05).Conclusion Dexmedetomidine can attenuate noise-induced hearing loss in guinea pigs possibly through inhibiting activation of sympathetic nerves and increasing COBF.

Cell Line, Tumor ; Cell Proliferation ; Colorectal Neoplasms ; Glycyrrhetinic Acid/pharmacology* ; Humans

Objective To explore the effects of co‐cultured heat‐treated candida glabrata with rat tracheal epithelial (RTE) cells on the expression of Dectin‐1 and the production of IL‐6 and TNF‐α.Methods RTE cells in vitro were co‐cultured with heat‐treated candida glabrata bacteria liquid for 2 ,4 ,6 h ,while without co‐cultured RTE cells were used as control group .We observed the morphological changes of RTE cells ,detected the protein expressions of Dectin‐1 by Western blot ,used real‐time PCR to detecte the mRNA expressions of IL‐6 and TNF‐αand measured protein expression of IL‐6 and TNF‐αby ELISA .Results With the pass‐ing of time ,the RTE cells were damaged extensively and the expression of Dectin‐1 ,IL‐6 and TNF‐αbecame more and more signifi‐cant .Obviously ,there had significant difference in the expression of Dectin‐1 ,IL‐6 and TNF‐α between the co‐cultured 2 h group and the control group ,the co‐cultured 4 h group and the co‐cultured 2 h group ,the co‐cultured 6 h group and the co‐cultured 4 h group (P<0 .05) .Conclusion RTE cells have natural immune function .The Dectin‐1 involves in the recognition of heat‐treated Candida glabrata ,activating secretion of IL‐6 and TNF‐αand mediating inflammatory reaction .IL‐6 plays a negative regulation role .

Suitable pretreatment of biological samples can truly reflect the role of law of the measured components played in the body and will provide experimental evidence for the studies on metabolic process, material basis of efficacy, mechanism of action, pharmacology, toxicology and the others. Biological samples include blood, urine, hair, tears, etc. There are also many samples processing methods, such as the direct protein precipitation, liquid-liquid extraction and solid phase extraction and so on. These methods could be used alone or combined.
Animals ; Body Fluids ; chemistry ; Chemical Precipitation ; Chemistry Techniques, Analytical ; methods ; Humans ; Liquid-Liquid Extraction ; Proteins ; isolation & purification ; Solid Phase Extraction

Objective To present a new method and design of an instrument for measuring intra-abdominal pressure (IAP) non-invasively. Method A pressure sensor (YH-4) and a displacement sensor (sliding rheostat) were assembled into a probe so that they work in a linear mode. When this assembled instrument probe acts on the abdominal wall of a subject, a pressure as called the external abdominal pressure (EAP), and a corresponding displacement were detected. A relationship was established mathematically between the IAP measured by non-invasive and invasive method, and IAP was calculated by EAP measurement indirectly non-invasively. Result The method was testified by animal experiment in rabbits. And the preliminary results indicated that linear relation between EAP and IAP was obtained. Conclusion Feasibility of the new method is validated by animal experiment. It provides scientific evidence for further clinical experiment.

AIM:To analyze the characteristics of optical coherence tomography ( OCT ) in diabetic optic neuropathy ( DON ) retrospectively.
●METHODS:Retrospective study. A total of 175 cases of type ll diabetes with fundus lesions from Dec. 2013 to Dec. 2015 were selected and the clinical information was collected. These cases were diagnosed by consultation between Departments of Ophthalmology and Endocrinology in the Second Affiliated Hospital of Xi′an Jiao Tong University. The results of body examination were recorded and cases were examined by color fundus photography, fluorescein fundus angiography ( FFA) and OCT. All these data were analyzed.
●RESULTS: A total of 49 cases ( 90 eyes, 25. 7%) were diagnosed DON through FFA which manifested abnormal fluorescence in optic papilla. Results of OCT showed:among 90 eyes of DON patients, 15 eyes ( 16. 7%) had normal optic nerve form; 20 eyes(22. 2%) of excavation of optic disc became smaller or disappeared, with prelaminar tissue and peripapillary retinal nerve fiber layer (RNFL) swelling;26 eyes (28. 9%) manifested optic cup deep and cup/disc ratio increasing;18 eyes (20. 0%) had tissue hyperplasia in the hollow or on the surface of optic disc; 11 eyes(12. 3%) had symptoms including vitreous traction optic papilla and optic disc rim rising. DON eyes which had similar fluorescence features could manifest different tissue morph by OCT.
●CONCLUSION: FFA defines DON by change of blood circulation in optic nerve. However, OCT can show differences of tissue morph of optic nerve that FFA fails to do. So OCT can manifest the causes and sites of optic neuropathy more clearly and also provide basis for treatment. The advantages of OCT are conducive to reviews and curative effect tracking among DON patients and these advantages including noninvasive, convenient, inexpensive and repeatable.

Objective:To investigate the effects of estradiol on ~(60)Co?-ray induced apoptosis of bone marrow hematopoietic cells of mice,and to discuss the related anti-irradiation mechanism.Methods:KM mice were randomly divided into 3 groups(15 mice/each group):control group(without radiation),pure radiation group and estradiol+radiation group(ER group).The pure radiation group was irradiated by 4.0 Gy?-ray at a dose rate of 1.15Gy/min;the ER group was administered with 0.1 mg estradiol(IM)at 10 days before 4.0 Gy?-ray radiation;and the control group received no special treatment.The apoptotic DNA segments of bone marrow hematopoietic cells were analyzed by DNA agarose gel electrophoresis;flow cytometry was used to examine the apoptosis rate of cells and expression of Fas and Bcl-2 at 4 h,8 h,and 12 h after irradiation.Results:Eight hours after radiation,the apoptotic DNA segments were obviously increased and apoptotic DNA ladder appeared,which was not seen in the other 2 groups.The apoptosis rate of bone marrow hematopoietic cells in ER group was significantly lower than that in the pure radiation group at 4,8,and 12 h after irradiation(P

OBJECTIVETo investigate effects of short-term sulfur dioxide inhalation to the liver.

METHODSHaematoxylin and eosin staining (HE) and transmission electron microscopy (TEM) were used to study the pathologic changes in mice liver after sulfur dioxide (SO(2)) inhalation.

RESULTSExposure to 56 mg/m(3), 112 mg/m(3) 168 mg/m(3) SO(2) caused increasingly severe liver injuries, as detected by HE staining and TEM. The morphologic changes included spotty necrosis with lymphocyte, monocyte, and neutrophil infiltration, fatty degeneration of hepatocytes with dilatation of rough endoplasmic reticulum and dissociation of ribosomes, as well as degeneration of mitochondria and karyorrhexis.

CONCLUSIONSO(2) inhalation can cause marked liver injury in experimental settings.

Administration, Inhalation ; Animals ; Hepatocytes ; drug effects ; pathology ; Liver ; drug effects ; pathology ; ultrastructure ; Male ; Mice ; Microscopy, Electron ; Sulfur Dioxide ; administration & dosage ; toxicity

The chemical constituents of Taxus chinensis var. mairei cell cultures were investigated by chromatographic methods, including silica gel column chromatography, Sephadex LH-20 and preparative HPLC. Thirteen compounds were isolated from the 80% ethanol extract of cultured cells and their structures were elucidated by spectral data and physicochemical properties, which were identified as 2α,4α,7β,9α,10β-pentaacetoxy-14β-hydroxytax-11-ene (1), 2α,4α,7β,9α,10β-pentaacetoxytax-11-ene (2), 1β-deoxybaccatin VI (3), 2α-acetoxytaxusin (4), taxuyunnanine C (5), yunnanxane (6), 2α,5α,10β-triacetoxy-14β-propionyloxy-4 (20), 11-taxadiene (7), 2α,5α,10β-triacetoxy-14β-isobutyryloxy-4 (20), 11-taxadiene (8), 2α,5α,10β-triacetoxy-14β-(2'-methyl)butyryloxy-4 (20), 11-taxadiene (9), 13-dehydroxylbaccatin III (10), 13-dehydroxy-10-deacetylbaccatin III (11), paclitaxel (12) and (13) β-sitosterol. Among them, compound 1 is a new compound, and compounds 2, 4, 10 and 11 are isolated from the cell culture of Taxus chinensis var. mairei for the first time.
Alkenes ; analysis ; Cell Culture Techniques ; Cells, Cultured ; Diterpenes ; analysis ; Molecular Structure ; Paclitaxel ; analysis ; Sitosterols ; analysis ; Taxoids ; analysis ; Taxus ; chemistry