Analysis of mild traumatic brain injury care in the U.S Armed Forces / 军事医学

During the recent conflicts in Iraq and Afghanistan,traumatic brain injury (TBI)has become the most prev-alent military injury that is described as the signature injuryof the current military operations.It usually causes no or mild external injury but results in serious long-lasting neuropsychiatric abnormalities,which have far-reaching impact on veterans,their families and the American society.Here we describeol the investment in TBI from the US government and the development in the diagnosis and treatment of mild TBI on the battlefield before putting forward some proposals for the Chinese army.

Protective effect of miR-30b on retinal ganglion cells against oxygen-glucose deprivation in vitro / 中华实验眼科杂志

Background Retinal ganglion cell (RGCs) death following ischaemic insult is the major cause of a number of vision-threatening diseases.Recent studies confirmed that micro RNA (miR-30b) can alleviate hypoxy-induced cardiac injury.However,whether miR-30b can protect RGCs against oxygen-glucose deprivation damage is still not ellucidated.Objective The aim of this study was to investigate the protective effect of miR-30b on RGCs damage caused by oxygen-glucose deprivation.Methods The retinas were isolated from the eyeballs of eight SD rats aged postnatal 24 hours and RGCs were primarily cultured.The cells were divided into the recombinant adeno-associated virus (rAVV) control group,rAAV-miR-30b mimic group and AAV-miR-30b inhibitor group.Then the cells were transfected using rAVV-miR plasmid,rAAV-miR-30b mimic plasmid and AAV-miR-30b inhibitor plasmid,respectively for 6 days with the RGCs ∶ AAV as 1 ∶ 10 000.The cells were cultured with low glucose medium in hypoxygen incubator (5％ CO2,17％ N2,3％ O2) or 5％ CO2 incubator respectively for 24 hours.Cell viability was detected by cell counting kit-8 assay.The expression of Tubulin Ⅲ,a neuron specific marker,was detected by immunofluorescence technology to evaluate the survival of RGCs.The apoptosis and necrosis of the cells were assessed by Hoechst/PI double staining.Results The RGCs grew well with round shape and 1 3 processes 7 days after cultured in the normal cells.However,the RGCs were diminished and the cell process disrupted in the oxygen-glucose deprivation group.The relative vability of the cells was 3.310-±0.162 in the rAAV-miR-30b mimic group,which was significantly higher than 0.949±0.141 in the rAAV-miR-30b inhibitor group and 0.900±0.181 in the rAAV-miR control group(t=10.508,10.296,both at P＜0.001).It was positively expressed in survival RGCs,with the red fluorescence.The number of Tubulin Ⅲ+ cells was (13.800± 1.924)/field in the rAAV-miR-30b mimic group,showing a significant increase in comparison with (0.600±0.548)/field in the rAAV-miR-30b inhibitor group and (0.800± 1.304)/field in the rAAV-miR control group (t =15.141,14.912,both at P ＜ 0.001).Significant differences were found in the apoptosis rate and necrosis rate among the rAAV-miR-30b mimic group,rAAV-miR control group and PBS group (F=10.851,P=0.002;F=6.378,P=0.013),and the apoptosis rate and necrosis rate in the rAAV-miR-30b mimic group were considerably lower than those in the rAAV-miR control group and PBS group (all at P＜0.05).Conclusions The oxygen-glucose deprivation models can be established in RGCs by hypooxygic and low-glucose cultivation.rAAV encoding miR-30b mimics transfection can protect RGCs against oxygen-glucose deprivation damage.

The effect of imprinting gene H19 on the gene expression profile of human choriocarcinoma cell line JEG-3 / 重庆医学

Objective To obtain the expression pattern of imprint gene H19 in JEG-3 cell in order to explore the regulation mechanism of H19 on trophoblast cellular biological behavior .Methods After correct identification with sequencing for the recom-binant eukaryotic expression plasmid pRc/CMV which including the whole length of H19 cDNA ,the plasmid was transfected to the cell line JEG-3 .The expression of H19 mRNA was observed and the gene expression profile of three groups of JEG-3 cell were de-tected with Affymetri :U133 plus 2 .0 Array .Results After being transfected with target H 19 gene ,the expression of the mRNA level was significantly increased compared with control group .And the gene expression profile was changed significantly .19 genes were up-regulated ,77 genes were down-regulated .Expression levels of HES1 gene which being choosed as a different expression gene were detected by fluorescence quantitative PCR in severe preeclampsia placenta tissue and normal late pregnant placenta .The expression level of HES1 mRNA in severe preeclampsia placenta decreased significantly than normal late pregnant placenta tissues . Conclusion Many genes induced by H19 have been screened by high-throughput gene chip method .It provides the experimental ba-sis for advanced studying the regulation the cellular biological behavior with H 19 gene .

Effect of adenosine A2A receptor on stress response of pituitary-adrenal axis in acute phase of craniocerebral trauma in mice / 中华创伤杂志

Objective To investigate the effect of adenosine A2A receptor on pituitary-adrenal axis response in acute phase of moderate craniocerebral trauma.Methods Eighteen adenosine A2A receptor knock-out mice in a C57BL/6 background and another eighteen their wild-type littermates were divided into normal control group and craniocerebral trauma for 4 hours group,and craniocerebral trauma for 24 hours group according to random number table,with siμ mice per group.Plasma levels of adrenocorticotropic-hormone (ACTH) and corticosterone at hours 4 and 24 postinjury were determined using ELISA method.Results At 4 and 24 hours,brain water content in wild-type mice [(80.950 ± 0.184) ％,(82.178 ± 0.255)％ respectively] was higher than that in gene knock-out mice [(80.006 ± 0.199)％,(81.091 ± 0.295)％ respectively,P ＜ 0.01].Besides,brain water content in both wild-type and gene knock-out mice increased after injury (P ＜ 0.01).Plasma levels of ACTH and corticosterone were higher in geneknock-out sham mice than in wild-type sham mice [(120.214 ± 2.472) ng/L vs (91.767 ±7.395) ng/L,(27.814 ±0.888) μg/L vs (11.430 ±0.644) μg/L respectively,P ＜0.0l].At 4 and 24 hours,plasma levels of ACTH [(174.776-± 5.040) ng/L,(189.613 ± 4.802) ng/L respectively] in geneknock-out mice showed a higher increase than those in wild-type mice [(119.594 ± 6.945) ng/L,(124.93-± 11.001 7) ng/L respectively,P ＜ 0.05].Moreover,plasma levels of corticosterone [(40.138 ±-0.805) μg/L] at 4 hours and [(37.440-0.485)μg/L] at 24 hours in gene knock-out mice showed a same result as compared with that in wild-type mice [(19.702 ± 0.804) μg/L,(17.602 ± 0.743) μg/L respectively,P ＜ 0.05].Conclusions Knock-out of adenosine A2A receptor increases the release of ACTH and corticosterone in acute stage of moderate craniocerebral trauma and promotes pituitary-adrenal stress response.This may provide a novel explanation for the neuroprotective effect of A2A receptor deficiency.

Mechanism of dexamethasone inhibiting U937 cell adhesion and phagocytose function / 中华创伤杂志

ObjectiveTo investigate the mechanism of dexamethasone (Dex) in inhibiting monocyte adhesion and phagocytose function.Methods Under the stimulation of phorbo1-12-myristate-13-acetate (PMA),U937 monocytes cultured in vitro were treated with Dex and Fasudil respectively.The adhesion rate of U937 monocles to human umbilical vein endothelial cells (HUVECs) and their phagocytic ability of India ink were studied.The protein content and activity of rho-associated coiled-coil protein kinase 1 ( ROCK1 ) as well as the effects of mifepristone and cycloheximide on Dex were determined.ResultsBoth DEX and Fasudil could significantly inhibit the adhesion tate and phagocytosis of U937 cells stimulated by PMA and suppressed the activity of ROCK1.While mifepristone and cycloheximide could not alter these effects of DEX.ConclusionDEX interferes with the adhesion and phagocytosis function of U937 cells by inhibiting ROCKI activity.

Expression of PirB in nerve tissues of normal adult mice / 中华创伤杂志

ObjectiveTo investigate the expression of paired immunoglobulin-like receptor B (PirB) in optic nerve, visual cortex, cerebella, spinal cord and sciatic nerve of normal adult mice.MethodsTwelve healthy adult BALB/c mice were randomly and equally divided into two groups.The immunohistochemistry and Western blot were used to detect the expression of PirB in the tissues described above respectively.ResultsBoth the immunohistochemistry and Western blot test revealed that the expression of PirB was positive in the optic nerve, visual cortex, cerebella and spinal cord, but negative in the sciatic nerve.The positive signals in the sections were located in the cell bodies and the neurites were observed in some of them.Western blot showed the apparent positive band of PirB in the optic nerve, visual cortex, cerebella and spinal cord rather than in the sciatic nerve.The protein expression level of PirB was relatively high in the visual cortex (P ＜0.05) but relatively low in the optic nerves (P ＜0.01).ConclusionThe PirB expresses positively in the optic nerve, indicating that PirB protein may closely correlate with the poor regeneration of the optic nerve.

Dynamic CT perfusion imaging in rats with traumatic brain injury and its relating pathophysiological basis:preliminary study / 中华创伤杂志

Objective To observe the variation of dynamic 64-slice CT perfusion imaging of rats with traumatic brain injury and discuss the relating pathophysiological basis.Methods A total of 80 adult male SD rats were randomly divided into three groups according to random number table,ie,normal control group,sham injury group and injury group.The injury group was divided into eight subgroups at time points of 2,6,12,24,48,72,120 and 168 hours.The detection of CT perfusion imaging,water content and blood-brain barrier permeability was done in the injured rats at all time points.The pathological changes were also observed to calculate their correlation with CT perfusion parameters of the injured region.Results The relative value of the blood perfusion was decreased significantly to the mimimum within 24 hours after injury.Within 2-12 hours,relative cerebral fluid(rCBF)and relative cerebral blood volume(rCBV)remained in a low perfusion state,with just a little increase.Relative mean transit time(rMTT)was prolonged and permeability surface(PS)increased.rCBF and rCBV were increased gradually with time,which was reversed till at 24 hours after injury and the injured side was in a high perfusion state,with the highest value of PS.The perfusion reached peak at 48 hours after injury and then became normal gradually.The water content was increased at 2 hours after injury and reached its peak at 48 hours.The permeability of blood-brain barrier(BBB)began to increase at 2 hours after injury and reached the peak at 24 hours.rCBF and rCBV were positively correlated with change of brain edema and PS was positively correlated with BBB permeability.Conclusion The dynamic 64-slice spiral CT perfusion imaging reflects the variation of BBB and edema and can be used as noninvasive imaging method for predicting the degree of brain perfusion and edema.

H19 expression in placenta with pre-eclampsia / 中华妇产科杂志

Objective To explore the role of H19 imprinting in etiology of pre-eclampsia. Methods Placentas of 24 women with pre-eclampsia (3 with mild pre-eclampsia and 21 with severe pre-eclampsia) and 50 healthy pregnant women at full term (control) were collected during selected cesarean delivery between August 2007 and March 2008. The statuses of H19 imprinting with placental tissues from normal pregnancy and patients with pre-eclampsia were identified upon polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The systolic and diastolic pressure were analyzed in H19 heterozygotic women. Results (1) There were 20 (40%) heterozygotes in 50 cases placenta tissues of the third trimesters, 11 (45%) heterozygotes in 24 cases placenta tissues of pre-eclampsia, There were no significant difference between two groups ( P > 0.05 ). (2) All 20 heterozygotes in placenta tissues of the third trimesters are exclusively monoallelically expressed, while 5 cases (45%) in 11 heterozygotes of pre-eclampsia are biallelically expressed (loss of imprinting, LOI). There were significant difference between two groups (P < 0. 01 ). (3) The values of systolic and diastolic pressure of patients with monoallelic expression of H19 were (171 ±9) mm Hg (1 nun Hg =0.133 kPa) and ( 104±8) mm Hg, the values of systolic and diastolic pressure with biallelic expression were ( 194±21 ) mm Hg and ( 124±18) mm Hg. There were significant difference between two groups (P<0.05 ). Conclusion LOI of H19 can be identified in pre-eclamptic placentas and is associated with maternal blood pressures, which implies the involvement of H19 gene LOI in the pathogenesis of pre-eclampsia and its potential relationship with the severity of the disease.

Study on morphology of surface atoms conformation of nanogold-based genechip / 生物医学工程学杂志

Conformations of surface atoms in various stages of nanogold-based genechip testing were scanned by the atomic force microscope based on the scanning tunneling microscope. The findings were: First, the surface atoms of genechip slide (formylphenyl glass) were in a regular porous-arrangement; Second, after combination with probe, the regular porous arrangement changed to be irregular; Third, after hybridization with the target nucleic acid, the surface atoms were once again in a cable-like arrangement which was relatively structured and intensively cross-parallel. However, after the silver staining, the surface atoms showed a larger block structure with serious unevenness. From these results we can intuitively know the process and differences in probe combination, nucleic acid hybridization, and silver staining. Moreover, the relevant experiment was verified at the micro-level.

Protecting mechanism of heat stress in treatment of acute lung injury / 中华创伤杂志

Objective To investigate the protecting mechanism of heat stress pretreatment on acute lung injury(ALI). Methods The oleic acid ALI mouse model was built to dynamically observe the binding capacity and the binding affinity of glucocorticoid receptor(GR),the levels of GR,heat shock protein 90(Hsp90)and Hsp70 before and after hyperthermic stress pretreatment. Results Heat stress pretreatment had significant protective effect on ALI.Western blotting showed insignificant changes of GR levels but progressive increase of level of Hsp70 and Hsp90.Heat stress pretreatment exerted insignificant effect on Bmax and Kd of GR,shown by radio ligand binding assay after ALI. Conclusion The protective effects of heat stress pretreatment on ALI of mouse may relate to its ability of keeping stable GR level and increasing levels of Hsp70 and Hsp90.

Establishment and evaluation of brain adenosine A2A receptors inactivation model of mice / 生物工程学报

To establish a model of inactivation adenosine A2A receptors in brain tissues of mice, we transplanted bone marrow cells (BMCs) from wild type (WT) C57BL/6 mice into A2A receptor knockout (A2A KO) C57BL/6 mice which were previously fractionated total body irradiation of 6.2 Gyx2. Six weeks later, we identified and evaluated the model. The results showed that the sexual chromagene pattern on white blood cells of recipient mice changed from female pattern to male pattern and there were 95.9% of A2AR+ cells in peripheral white blood cells of recipient mice, whereas there was no significant difference of A2AR mRNA level in brains between these recipient mice and A2AR KO mice. Furthermore, there was no significant difference of breathing frequency, brain water content and level of glutamate between the model mice and WT mice. These results indicated that we established successfully a mouse model of inactivation adenosine A2A receptors in brain tissues. This may provide a new and efficient strategy to study the effect of adenosine A2A receptors in disease and injuries of central nervous system.

A study on surface plasmon resonance-based gene chip / 生物医学工程学杂志

The surface plasmon resonance (SPR)-based gene chip was prepared according to the following processes: First, a film of nanogold, which was synthesized by using Frens' method, was plated on chip by Chlorauric acid/hydroxylamine method. Then probes were fixed on nanogold film by Self-assembled monolayer (SAM) technology. Subsequently, the fixing time and concentration of probes, the sensitivity and the specificity of the chip were optimized. Our results suggested that the chip plated with 2.5 nm nanogold film has a better SPR reflection, and when fixed by probes for 4.5 h at the concentration of 1 500 nmol/L, the gene chip also shows a fine performance of detection and can identify accurately the mismatch between bases in SPR detection system. The gene chip constructed in the research can be used for SPR sensor detection.

Establishment of a selective inactivation adenosine A2A receptors mice model / 中华血液学杂志

<p><b>OBJECTIVE</b>To establish a mice model with selective inactivation adenosine A2A receptors (A2ARs) in peripheral white blood cells (PWBC).</p><p><b>METHODS</b>A2ARs were selectively inactivated in PWBCs by transplanting bone marrow cells (BMCs) from A2AR knockout (KO) mice into their wild type (WT) littermates after a single total body irradiation of 9.5 Gy or fractionated total body irradiation of 6.2 Gy x 2. The efficiency of reconstitution of bone marrow-derived cells in chimeric mice was assessed.</p><p><b>RESULTS</b>PCR band patterns changed from the recipient pattern (one band of 330 bp) to the donor (two bands of 300 and 330 bp) pattern. Immunohistochemistry analysis showed that 10.21% of cells were A2AR+ in PWBCs in KO--> WT mice, whereas 96.72% of cells were A2AR+ in WT mice. The survival rates of mice irradiated with 6.2 Gy x 2 and transplanted with more than 6 x 10(6) BMCs were about 91%.</p><p><b>CONCLUSION</b>A murine model of selective inactivation adenosine A2A receptors in PWBCs was established successfully.</p>

Imprinting Status of H19 Gene in Normal Villi Tissue During First Trimester:A Preliminary Study / 中华医院感染学杂志

OBJECTIVE To study the imprinting status of H19 gene in normal villi tissue during the first trimester,and its relation to the invasion of trophoblast. METHODS Using PCR-RFLP methods to examine the imprinting status of H19 gene in 93 cases of normal villi tissue during the first trimester. RESULTS Among 93 cases, heterozygous genotypes were found in 42 cases. And 11 cases of biallelic expression were found among these 42 cases of heterozygous genotypes from 5 to 9 weeks, however no biallelic expression existed from 10 to 12 weeks. CONCLUSIONS During the first trimester, H19 is expressed biallelically at the first 10 weeks. The H19 gene may dynamicly change in the trophoblast, and the dynamic change may have close relationship with the invasion of the trophoblast.

Nanogold-based Gene Chip for Rapid Pathogen Detection / 中华医院感染学杂志

OBJECTIVE A practical gene chip which aimed to detect and identify pathogens rapidly and exactly is developed on the basis of patent technology of nano-enlargement-detection. METHODS Oligonucleotide probes for the specific gene fragments of target pathogens were designed and immobilized on gene chip.Target sequences were labeled by nanogold as reporter materials.After hybridization,its results were recorded by the interaction between nanogold and silver which amplified the hybridization signal to form brown particles,which could be detected by naked eyes. RESULTS The probes designed were all of strong specificity and great reliability possessing identity of hybridization conditions.The reaction time for marking could be decreased by properly raising the ratio of nanogold and nucleic acid and the speed of labeling reaction could be fastened significantly by gentle agitation.A better hybridization results could be obtained when the samples were hybridized for 8 hours at 45℃ with 0.8 mol/L ionic strength,and then strictly rinsed.Furthermore,the hybridization efficiency could be increased remarkably by slight circumgyratation.A better chromatic effect resulted from the reaction way in 3min?3 at 37℃.The sensitivity of gene chip assays in this test could reach to 100 fmol/L.Compared with traditional detection approach,detection by the chip displayed such advantages as speediness and simplicity and the detection results could be easily recognized by naked eyes. CONCLUSIONS The chip detection technology has met the demand of design exhibiting high sensitivity,strong specificity,and easy operation without special device and showing a promising prospect.

Effect of exogenous p73 gene on chemosensitivity of wild-type p53 human lung adenocarcinoma cell A549 / 中国肺癌杂志

<p><b>BACKGROUND</b>To assess the effects of exogenous p73 gene on chemosensitivity of wild-type p53 human lung adenocarcinoma cell A549 to cisplatin (DDP) and adriamycin (ADM).</p><p><b>METHODS</b>Recombinant eukaryotic expression vector pcDNA3 containing full-length human wild-type p73α cDNA or p53 cDNA was transfected into A549 cells which had wtp53 by lipofectamine-mediated gene transfection. The chemosensitivity of tumor cells to DDP and ADM was observed before and after transfection.</p><p><b>RESULTS</b>A549-p73α could stably express P73α protein. The P73α protein expression was significantly increased in A549-p73α than that in A549 and A549-pcDNA3. The growth and colony formation of A549-p73α were significantly inhibited compared with A549, A549-pcDNA3 and A549-wtp53. Flow cytometry and DNA fragmentation analysis showed apoptosis of A549-p73α cells was significantly increased. The IC₅₀ values for DDP and ADM were reduced to approximate 1/6 and 1/70 in A549-p73α cells compared with A549 cells respectively..</p><p><b>CONCLUSIONS</b>Exogenous p73 gene is capable of enhancing the sensitivity of wild-type p53 human lung adenocarcinoma cell A549 to chemotherapeutic drugs. It is probably for p73 to be used in the treatment of p53-resistant tumors.</p>

Detection of Bacterial Pathogens by Nanogold-based Gene Chip Combining with One-time PCR with Common Primers / 中华医院感染学杂志

OBJECTIVE To develop a preparation technique of sample of one-time PCR with common primers based on ribotyping which was combined with the detection system of nanogold-based gene chip to detect clinical bacterial pathogens.METHODS According to the highly conserved regions of rDNA,the common primers were designed and used to amplify each target bacterial ISRs by one-time PCR,and the specific oligonucleotide probes for each target ISRs were designed,utilized to establish the new nanogold-based gene chips.After the characteristics of the chip such as sensitivity,specificity and reliability were determined,the chip was used to detect clinical samples.RESULTS The designed common primers could amplify the 12 target bacteria successfully by one-time PCR.All selected probes were of strong specificity and great reliability.The chip had high sensitivity,specificity and reliability,reaching 50 fmol/L of detection sensibility.Clinical detection results showed the chip had a great accuracy.CONCLUSIONS Compared to multi-PCR chip detection,the detection procedure and complexity of the chip are decreased significantly,and have more practical value in clinical pathogens detection.

The effects of naloxone and positive end expiratory pressure ventilation on respiratory function in dogs with experimental RDS / 第三军医大学学报

Respiratory distress syndrome was produced in dogs with the combination of oleic acid injection and gunshot wounding,and the therapeutic effects of naloxone(NAD and positive end expiratory pressure ventilation(PEEP)were assessed with the examinations of macropatholo-gy of the lungs,lung water ratio.respiratory rate(RR)and blood gas analysis.It was found that RR was rapidly and significantly increased tPaO2 decreased and Qs/Qt increased and there was severe pulmonary hemorrhage,edema and atelectasis in the controls after injury.NAL treatment could slightly alleviate the increase of RR and prevent the early of PaCO2,but it had no effects on the changes of PaO2,Qs/Qt and increase pulmonary hemorrhage,edema and atelectasis.PEEP could improve the decrease of PaO2 and the increase of Qs/Qt and prevent pulmonary atelectasis and alveolar edema from occurring,but it could not significantly stop the increase of lung water ratio.

Simultaneous detection of multiple pathogens by nano-gold-based gene chip combined with restrictive enzyme digestion without PCR / 解放军医学杂志

Objective For realizing the simultaneous detection of multiple pathogens,by looking for a method with a combination of the new gene chip detection system based on nano-gold with the technology of restriction endonuclease without PCR.Methods Helicobacter pylori,Mycoplasma pneumoniae,Chlamydia trachomatis,Candida albicans,Ureaplasma urealyticum,and EB virus were selected as the experimental targets.Endonuclease Hha Ⅰ was selected as tool enzyme.After bering digested by Hha Ⅰ,the digested fragments of samples were tailed with poly-A.The samples were then detected by the gene chip detection system based on nano-gold.Both specific and common probes were used in the hybridization.The coincidence rate of the detection results between the new constructed chip test and the fluorescence quantitative PCR test in 168 clinical samples was examined.The stability and sensitivity of chips detection were also checked.Results The new constructed nano-gold-baesd gene chip combined with restrictive enzyme digestion without PCR could be used to detect the target pathogens.The coincidence rate of the chip detection test and fluorescence quantitative PCR test in 168 clinical samples was 89.2%.Chip detection results showed that the stability of chips detection was 100% and the sensitivity was 50pmol/L.Conclusion The newly constructed nano-gold-baesd gene chip combined with restrictive enzyme digestion without PCR can be widely applied in the simultaneous detection of Mycoplasma,Chlamydia,fungus,virus and bacteria.It shows a bright prospect in increasing the throughput of identifieation of pathogene.

Interrelationship between the Contents of Thromboxane and Prostacyclin in Plasma and Lung Tissue in ARDS in Rabbits / 第三军医大学学报

This study was designed to investigate the changes of the contents of throm-boxane (TXA2) and prostacyclin (PGI2) in the pulmonary tissue and in the plasma of the pulmonary arteries and left atrium of the rabbits during ARDS induced with oleic acid injection and the interrelationship between the two substances.The contents of TXA2 and PGI2 were determined indirectly,by measuring the amounts of TXB2 and 6-keto-PGF1a,the stable metabolites of TXA2 and PGI2 respectively,with radioimmunoassay.After an injection of oleic acid to the rabbits (0.045ml/kg),the contents of TXB2 in both the plasma and lung tissue were significantly elevated The content of 6-keto-PGF1a in the plasma significantly increased at 30 minutes and reached the highest point at 180 minutes after the injection,and that in the lung tissue began to increase at 5 minutes and reached the peak at 60 minutes after injection The ratio of TXB2/6-keto-PGI18 increased in the early stage after injection and then reduced both in the plasma and the lung tissue.The results indicate that the contents of TXA2 and PGI2 in the plasma are not always parallel with those in the lung tissue,which suggests that the variation of the ratio of TXA2/PGI2 may play an important role in the pathogenesis of ARDS.