Animals ; Hyperbaric Oxygenation ; Lung ; enzymology ; Oxygen ; Protein Kinase C ; metabolism ; Rats

OBJECTIVETo investigate the effect of different pressure oxygen pre-breathing in preventing decompression sickness of rats.

METHODSForty male SD rats were randomly divided into 4 groups: decompression sickness (DCS) group and three oxygen pre-breathing groups with 1 ATA, 2 ATA and 3 ATA pressure respectively. The rats of DCS group were placed in the hyperbaric chamber and the chamber was compressed evenly within 3 minutes to depths of 7 absolute atmosphere(ATA) and held at the designated depth for 60 min, then decompressed (3 min) at constant speed to the surface pressure. After that, the rats were taken out for further detection. While the rats of oxygen pretreatment groups pre-breathed different pressure oxygen for 20 min before entering into chamber. The mortality and behavioral of rats were observed with 30 min post decompression. The dry/wet ratio of the lung, protein levels in the bronchoalveolar lavage fluid (BALF), and the inflammatory cytokine tumor necrosis factor (TNF-alpha) expression were also tested.

RESULTSCompared with that of the DCS group, the mortality and morbidity of oxygen pre-breathe groups didn't change obviously. But the total BALF protein level and the inflammatory cytokine TNF-alpha expression of 1 ATA oxygen pre-breathe group were obviously decreased, while the dry/wet ratio of lung as obviously increased instead (P < 0.05).

CONCLUSIONAlthough preoxygenation can' t obviously change the mortality and mobidity of rats, normal pressure oxygen pre-breathing can mitigate the protein infiltration in BALF and the expression of inflammatory cytokine in lung tissue.

Animals ; Bronchoalveolar Lavage Fluid ; chemistry ; Decompression Sickness ; Diving ; Lung ; pathology ; Oxygen ; physiology ; Pressure ; Rats ; Rats, Sprague-Dawley ; Tumor Necrosis Factor-alpha ; metabolism

BACKGROUND:Segmental bone defects resulting from osteoporotic fractures, trauma, congenital bone dysplasia and progressive bone disorder are very common, and bone tissue engineering provides a new approach to bone defect repair. Growth factors related to bone tissue engineering bone have been reported a lot and have achieved some results. How to mimick the natural timing of different growth factors with different bioactivities has become the current hotspot in bone repair. OBJECTIVE: To review the new developments in vascular endothelial growth factor and bone morphogenetic protein in bone tissue engineering. METHODS: The first author searched CNKI (1990/2015) and Medline database (1990/2015) for related articles using the key words of “osteogenic factors, angiogenic factors, tissue engineering bone, bone repair, vascularization, vascular endothelial growth factor, bone morphogenetic protein, sequential release, seed cels, cytoskeleton” in Chinese and English, respectively. Mechanism of action and research direction about vascular endothelial growth factor and bone morphogenetic protein were summarized. RESULTS AND CONCLUSION:Totaly 313 papers were searched initialy, and finaly 87 papers were enroled in result analysis. The results show that different growth factors play different roles in bone repair. Vascularization and osteogenesis are the most important processes in bone repair. The osteogenic factors play an important role in maintaining bone structure and bone formation. The angiogenic factors can provide oxygen and nutrients for tissue growth, differentiation and functionalization. The combination of osteogenic and angiogenic factors has a better osteogenic effect than osteogenic or angiogenic factors used alone. However, the most important problem is how to control the exogenous osteogenesis and the release dosage of angiogenic factors in bone repair.

Objective To study the effect of shenfu injection on the neuron apoptosis in hippocampal CA1 region of newborn with hypoxic-ischemic brain damage(HIBD).Methods The experiment included 2 parts.One was to measure the apoptosis rate by the flow cytometry,and the other was to investigate the expression of Bcl-2 and Bax of neurons in left hippocampal CA1 region.Models of postnatal 7-day Sprague-Dawley(SD)rats with HIBD were established,and were equally divided into 4 groups:sham operation(group S),control group(group C),shenfu injection pretreatment(group P),and shenfu injection treatment(group SF).The neuron apoptosis rate in hippocampal CA1 region in every group was measured at 2 h before and 2,12,24 h,3,7,14 and 28 d after hypoxic ischemic(HI) insult.The expressions of Bcl-2 and Bax were performed by immunohisochemistry.Results The apoptosis of neuron in hippocampal CA1 region in group P and group SF after HI insult was significantly less than that of group C(P

To improve the antibiotics production of Streptomyces qinlingensis sp. nov.,protoplast regeneration combined with physical and chemical mutagenesis was used to selected high-yielding strains. The results showed that the antibacterial activities of strain R-72 from protoplast regeneration and NTG-1,H30-7 from protoplast mutagenesis against Bacillus subtilis were more than 20% higher than that of the original strain,and the heredity characters of those strains were stable in successive ten generations. The further bioassay experiments exhibited that the fungicidal and antibacterial activities of the fermentation broth from R-72,NTG-1 and H30-7 were remarkable increased comparing with that of the starting strain.

In order to explore the clinical hypolipidemic features of Daidai flavone extract, the pharmacokinetics features of characteristic active ingredients of Daidai flavone extract in normal and hyperlipemia rats were studied and compared. The study established the quantitative determination method of naringin and neohesperidin in plasma by UPLC-MS. Study compared the pharmacokinetics differences of naringin and noehesperidin in normal and hyperlipemia rats on the basis of establishment of hyperlipemia model. Results indicated that the pharmacokinetics features of characteristic active ingredients of Daidai flavone extract in normal and hyperlipemia rats showed significant differences. The C(max) of naringin and neohesperidin in hyperlipemia rats plasma after oral administration of Daidai flavone extract increased obviously, while t1/2, MRT and AUC0-24 h decreased, compared to normal rats. But t(max) showed no differences to that of normal rats. The results further proved Daidai flavone extract would have better hypolipidemic effect in the hyperlipemia pathological status. And the characteristic active ingredients naringin and noehesperidin were the material base of Daidai flavone extract to express the hypolipidemic effect.
Animals ; Citrus ; chemistry ; Drugs, Chinese Herbal ; isolation & purification ; pharmacokinetics ; Flavones ; chemistry ; Hyperlipidemias ; metabolism ; Male ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo investigate the change of adhesion molecules in the lungs of rats suffered with decompression sickness (DCS).

METHODSMale SD rats were placed in the hyperbaric chamber, the chamber was compressed within 3 minutes to depths of 7 absolute atmosphere (ATA) and held at the designated depth for 60 min, then rapidly decompressed (3 min) to the surface. Rats were observed for signs of DCS after decompression. The brains, hepatis, and lungs were removed at 30 min, 6 h, 24 h post decompression, fixed and stained with hematoxylin eosin for routine histologic analysis. Lung paraffin sections were immunostained for the expression of intercellular adhesion molecule-1 (ICAM-1), E-selectin and major histocompatibility complex class II molecule (MHC-II). 2% evans blue dye in normal saline was injected 30 minutes prior to 6 h, 24 h before decompression. After 30 min, animals were perfused with 0.9% normal saline and lungs were harvested. Evans blue in the plasma was quantified by wavelength spectrophotometric analysis at 620 nm.

RESULTSResults showed that there were hemorrhage and edema changes in the lungs, liver and brain at 30 min post decompression. Compared with control animals maintained at 1 ATA, the levels of E-selectin, ICAM-1 and MHC-II in the lungs of DCS rats were significantly increased post decompression. Compared with control animals, evans blue in the plasma was much higher at 6 h, 24 h post decompression.

CONCLUSIONThe bubble-induced adhesion molecule-mediated endothelial activation may be involved in the pathogenesis of DCS.

Animals ; Brain ; pathology ; Cell Adhesion Molecules ; metabolism ; Decompression Sickness ; metabolism ; E-Selectin ; metabolism ; Endothelium, Vascular ; metabolism ; Genes, MHC Class II ; Intercellular Adhesion Molecule-1 ; metabolism ; Liver ; pathology ; Lung ; metabolism ; pathology ; Male ; Rats ; Rats, Sprague-Dawley

Background Age-related cataract is one of the common causes of blindness.Although the pathophysiology of age-related cataract is far from clearly understood,it is well accepted that DNA damage plays an important role in the disease pathogenesis.Objective The purpose of this study was to quantitatively evaluate the DNA damage in peripheral lymphocytes of age-related cataract.Methods A cross-sectional study was carried out.This study complied Declaration of Helsinki and approved by Ethic Committee of Affiliated Hospital of Nantong University.Written informed consent was obtained from each subject.Two hundred and eleven patients with agerelated cataract and 147 normal subjects were enrolled from a “ Jiangsu Eye Study:Funing 2011 Eye Disease Epidemic Survey”.All the subjects aged from 50 through 80 years with matched age and gender between the two groups.The percentage of tail DNA and Olive tail moment (OTM) were detected by comet assay to assess the extent of DNA damage in peripheral lymphocytes.Statistical analyses were performed with SPSS 17.0 software,and the differences of the percentage of tail DNA and OTM were compared between the age-related cataract group and normal control group by independent sample t test as well as among the 50-59 years group,60-69 years group and ≥70 years group by one-way analysis of variance.Results Comet assay showed a round lymph cell with the clear border in the normal group;while in the age-related cataract group,the cell was bigger with a comet-like tail.The percentage of tail DNA and OTM in peripheral lymphocytes were (21.75 ± 3.51) ％ and 6.54 ± 1.65 in the age-related cataract group,and those in the normal control group were (9.31 ±3.60)％ and 2.18 ± 1.10,respectively,with significant differences between them (t =32.67,P =0.00 ; t =28.02,P =O.00).In the 50-59 years subgroup of the age-related cataract group,the percentage of tail DNA and OTM in peripheral lymphocytes were (20.04±2.86) ％ and 5.92± 1.14,and in the 60-69 years subgroup of the age-related cataract group,the percentage of tail DNA and OTM in peripheral lymphocytes were (20.77 ±2.93) ％ and 6.13 ± 1.14,which were significantly reduced in comparison with (22.79 ± 3.67)％ and 6.95±1.91 of the ≥70years subgroup(TailDNA％:q=2.75,P=0.00; q=2.02,P=0.00;OTM:q=1.03,P =0.02 ; q =0.82,P =0.00).Conclusions The pathogenesis and development of age-related cataract probably is associated with DNA damage.

The importance and feasibility was analyzed of the teaching BBS for aiding classroom teaching based on campus network. The design, technique, content, advantages and deficiencies were presented of agricultural microbiology teaching BBS. The prospect also was discussed of teaching BBS based on campus network in this paper.

OBJECTIVEBy establishing a model of straight-leg swaddle of newborn rats and observing the experimental animals'hips morphologically and pathologically, this study explored the changes of gross appearance of the acetabulum and the maturity of cartilage cells in the different regions of acetabular cartilage complex.

METHODSThe legs and hips were fixed by adhesive tape for 10 days in the position of hip extension and adduction in 31 newborn Wistar rats (experimental group). The other 31 newborn rats without legs and hips treatment were used as the control group. After 10 days raising in the same condition, all the rats were sacrificed. The gross appearance, histological observations and VEGF and type X collagen immunohistochemistry were used for examining the acetabulum changes.

RESULTSA straight leg swaddle model of newborn rats was established successfully. In the experimental group the acetabulum became shallow and small and surrounded by more soft tissues. There were 49 dislocated hips (49/54) in the experimental group and 2 hips dislocated (2/60) in the control group (p<0.01). Fake acetabulum appeared in the experimental group. In the control group, the shape of the acetabulum was normol, and no fake acetabulum was found. The safranin O-fast green staining showed that the orange-red cartilage in the experimental group was wider than the control group. Immunohistochemistry observations showed VEGF and type X collagen immunoreactivities in the hypertrophic layer of the acetabular cartilage complex in the experimental group were lower than those in the control group. The percentages of VEGF positive and type X collagen positive cells in the iliac hypertrophic layer of the acetabular articular cartilage were significantly higher than those in the ischiadic ramus and the pubic branch in the experimental group.

CONCLUSIONSVEGF and type X collagen immunoreactivities in acetabular cartilage cells decrease in a straight-leg swaddle model of newborn rats. This suggests that this position might lead to dysmaturity of the acetabular cartilage cells and affect the development of the acetabulum.

Acetabulum ; growth & development ; pathology ; Animals ; Animals, Newborn ; Bone Development ; Cartilage ; growth & development ; pathology ; Collagen Type X ; analysis ; Disease Models, Animal ; Female ; Hip Dislocation, Congenital ; metabolism ; pathology ; Immunohistochemistry ; Male ; Rats ; Rats, Wistar ; Vascular Endothelial Growth Factor A ; analysis