A method for predicting basins in the global optimization of nanoclusters with applications to AlxCuy alloys.

The problem of obtaining the geometrical configuration of a molecule that minimizes its potential energy is a very complicated one for a series of applications, ranging from determining the structure of biological macromolecules to nanoclusters of atoms. Global optimization tools are available for this task, and many of them are based in performing successive local optimizations, where the starting geometries for these steps are determined by an intelligent algorithm. Here we develop a method to save computing time in the optimization of nanoclusters by predicting if a given minimum has been previously visited during local optimization steps. Our application to Cu-Al nanoalloys indicates that it is possible to save a substantial amount of computational cost. The application also reveals new promising AlxCuy clusters and explain their stabilities in terms of the jellium model.

An optical pickup enzyme-linked immunosorbent assay (ELISA) with a microfluidic disk.

We evaluated optical pickup ELISA with an original microfluidic disk that contains eight radially arranged channels, which enable semi-automatic sample loading and washing. This disk-shaped chip composed of acrylic plates was fabricated by CO2 laser machining and capture antibodies were immobilized in the channels. After the immunoreaction with antigens and enzyme-linked secondary antibodies, an enzyme-catalyzed nanoaggregation of o-phenylenediamine was detected by measuring the reflectivity change of a laser beam focused in the channel. The assay of C-reactive protein (CRP) was successfully performed in a short amount of time (approximately 20 min from CRP loading). The limit of detection was determined to be 2 ng mL-1, which is more sensitive as compared with conventional ELISA using microplates.

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions.

The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of atmospheric methane, is poorly constrained. Here we report rates of microbially mediated AOM (average rate=20 nmol cm(-3) per day) in three freshwater wetlands that span multiple biogeographical provinces. The observed AOM rates rival those in marine environments. Most AOM activity may have been coupled to sulphate reduction, but other electron acceptors remain feasible. Lipid biomarkers typically associated with anaerobic methane-oxidizing archaea were more enriched in (13)C than those characteristic of marine systems, potentially due to distinct microbial metabolic pathways or dilution with heterotrophic isotope signals. On the basis of this extensive data set, AOM in freshwater wetlands may consume 200 Tg methane per year, reducing their potential methane emissions by over 50%. These findings challenge precepts surrounding wetland carbon cycling and demonstrate the environmental relevance of an anaerobic methane sink in ecosystems traditionally considered strong methane sources.

Green tea extract inhibits the onset of periodontal destruction in rat experimental periodontitis.

BACKGROUND AND OBJECTIVE: Green tea extract exerts a variety of biological effects, including anti-inflammatory activities. However, there has been no report on the effect of green tea extract on loss of attachment, which is an important characteristic of periodontitis. Here, we examined the inhibitory effects of green tea extract on the onset of periodontitis in a rat model. MATERIAL AND METHODS: Rats were immunized intraperitoneally with Escherichia coli lipopolysaccharide (LPS). The LPS group (n = 12) received a topical application of LPS onto the palatal gingival sulcus every 24 h. The green tea extract group (n = 12) received a topical application of LPS mixed with green tea extract, sunphenon BG, every 24 h. The phosphate-buffered saline (PBS) group (n = 6) received a topical application of PBS every 24 h. The levels of anti-LPS immunoglobulin G (IgG) in serum were determined using ELISA. Rats in the LPS and green tea extract groups were killed after the 10th and 20th applications. Rats in the PBS group were killed after the 20th application. Loss of attachment, level of alveolar bone and inflammatory cell infiltration were investigated histopathologically and histometrically. RANKL-positive cells and the formation of immune complexes were evaluated immunohistologically. RESULTS: There was no significant difference in the serum levels of anti-LPS IgG between the LPS group and the green tea extract group. In contrast, loss of attachment, level of alveolar bone, inflammatory cell infiltration and RANKL expression in the green tea extract group were significantly decreased compared with those in the LPS group. CONCLUSION: These findings demonstrate that green tea extract suppresses the onset of loss of attachment and alveolar bone resorption in a rat model of experimental periodontitis.

Clinical usefulness of concentrated ascites reinfusion therapy (CART) for gynecological cancer patients with refractory massive ascites due to cancerous peritonitis.

PURPOSE: Cell-free and concentrated ascites reinfusion therapy (CART) is intended to treat patients by ultrafiltration and reinfusion of their refractory ascites. In the CART system, bacteria and cancer cells in removed massive ascites are filtrated. Then, water is removed in the condenser, resulting in a higher protein concentration. The purpose of this study was to assess the clinical usefulness of CART in the treatment of refractory massive ascites in patients with cancerous peritonitis. MATERIALS AND METHODS: CART was performed 13 times in four patients with ovarian and endometrial cancer. RESULTS: Autologous protein with a higher concentration was intravenously administered. The amount of aspirated and condensed ascites was 3,190 +/- 1,086 ml (975 4,500 ml) and 538 +/- 249 ml (100 - 860 ml), respectively. Condensed albumin, albumin concentration, and concentration time were 43.2 +/- 25.8 g, 8.2 +/- 3.3 g/dl, and 73.3 +/- 24.8 min (28 - 122 min), respectively. CART was effective in maintaining serum albumin concentrations, and it is possible to repeat infusion. During CART, patients performance status was 1-2 and vital signs were stable except for mild elevations in body temperature. Daily life was maintained without serious side-effects. CONCLUSIONS: The use of CART for gynecological cancer patients with refractory massive ascites due to cancerous peritonitis contributes to improvements in quality of life and relief of symptoms. With autologous infusion of condensed ascites, patients can avoid infection, allergic reactions, and administration of expensive blood products.

T cells are able to promote lipopolysaccharide-induced bone resorption in mice in the absence of B cells.

BACKGROUND AND OBJECTIVE: T cells and their cytokines are believed to be key factors in periodontal disease and bone resorption. We previously showed that T cells transferred to nude mice were related to inflammatory bone resorption in vivo. However, it has not been clarified whether T cells can induce bone resorption in the absence of B cells. In this study, we therefore investigated the ability of T cells to induce bone resorption without B cells, using both T cell- and B cell-deficient mice with severe combined immune deficiency (SCID). MATERIAL AND METHODS: Escherichia coli lipopolysaccharide (LPS) was injected into the gingivae of SCID mice reconstituted by T cells (SCID + T mice). Wild-type C.B-17 mice and SCID mice were used as control animals. Alveolar bone resorption and production of cytokines in the gingivae were then compared histopathologically and immunohistologically. RESULTS: The degree of bone resorption in SCID + T mice was significantly greater than that in SCID mice but less than that in wild-type mice. The same tendency was found for expression of receptor activator of nuclear factor kappaB ligand. The number of interferon-gamma-positive cells in SCID + T mice was the highest of the three groups. In contrast, interleukin-4-positive cells were detected in wild-type mice but not in SCID + T and SCID mice. CONCLUSION: The results suggest that T cells are able to promote LPS-induced bone resorption in the absence of B cells. The expressions of cytokines in the presence of B cells are quite different.

Changing distribution of group A rotavirus G-types and genetic analysis of G9 circulating in Japan.

A total of 1,797 fecal specimens from infants and children with acute gastroenteritis in Japan from July 2000 to June 2003 were tested for group A rotavirus by ELISA, RT-PCR, RNA-PAGE and latex agglutination methods. Of these, 439 were found to be positive for group A rotavirus and this presented 24.4%. In 2000-2001, G1 was the most prevalent (45.5%) followed by G2 (32.5%), G3 (12.3%), G9 (5.9%) and G4 (2.6%). However, G2 was found predominant with 40% in the following year (2001-2002). Interestingly, G9 had a rapid increase of infection up to 17.8%. In 2002-2003, G3 dominated over other G-types with 34%. Another interesting feature of the study was the demonstration of great genetic diversity among G9 strains in Japan. Worth of note was the first prevalence pattern of rotavirus G-types with an increase of G2, G3 as well as G9 and a decrease of G1 during the 20 year-survey of rotavirus infection in Japan.

Infective endocarditis in congenital heart disease: Japanese national collaboration study.

OBJECTIVE: To provide pure cohorts of paediatric and adult patients with congenital heart disease (CHD) and infective endocarditis (IE) for making future guidelines. DESIGN: Japanese nationwide survey. SETTING: 66 Japanese institutions. PATIENTS: 170 children, mean (SD) age 7.4 (5.7) years (range 14 days to 17 years), and 69 adults, age 32.5 (14.1) years (range 18-69) who developed IE between 1997 and 2001 (one in 240 admissions with CHD). MAIN OUTCOME MEASURES: Clinical presentation of IE. RESULTS: 119 patients including 88 with cyanotic CHD had previous cardiac surgery. Procedures preceding IE were dental (12%) followed by cardiovascular surgery (8%). Sites of infection were left sided in 46% and right sided in 51%. Vegetation with diameter of 11 mm was documented in 151 (63%). Frequent complications were embolic events (stroke 11%, other emboli 20%) and cardiac failure (23%). The most common microorganisms were streptococci (50%) and staphylococci (37%) with methicillin resistant Staphylococcus aureus in 7.5%. Empirical treatments were penicillins (alone or with other antibiotics 57%) followed by cephems (22%) and vancomycin (11%). Surgery during active IE was common (26%), with vegetation (45%) and heart failure (29%) as the most frequent indications. Mortality was 8.8%: 8.0% among patients who received medical treatment alone and 11.1% among those with active IE who underwent surgery. The causes of death (n = 21) were surgery (7), infection (7), cardiac failure (6), and renal failure (1). CONCLUSIONS: Because of a recent increase in the incidence of IE and high mortality and complication rate, it is mandatory to establish well formulated recommendations for management of IE in paediatric and adult patients with CHD based on a large cohort. Results of this nationwide multicentre database should be helpful in establishing guidelines.

Rapid increase in the prevalence of obesity in elementary school children.

OBJECTIVE: Three critical periods have been suggested for the development of obesity during childhood: fetal, ages 4-6 y, and adolescence. The prevalence of obesity in elementary school children is increasing in Japan, and the present study examines whether this rising prevalence occurs during the elementary school period (age 6-11 y) or is occurring prior to entry into elementary school. DESIGN: Repeated cross-sectional sampling of cohorts of children for the prevalence of obesity. SETTING AND PARTICIPANTS: The data from 81 264 first grade and 87 849 seventh grade children (94 and 87% of the total populations, respectively) between 1989 and 2002 in Kagoshima City were analyzed. Data were also obtained from nationwide surveys published by the Ministry of Japan between 1989 and 2001. MEASUREMENTS: Obesity was defined by the body mass index for an age- and sex-specific 95th percentile cutoff point in Japanese children. Trends in obesity and odds ratios of the prevalence of obesity were also determined. RESULTS: The period 1989-2001/2 showed significant increases in the prevalence of obesity for both genders, in both first and seventh grades, and in both Kagoshima City and nationwide. The odds ratios for the prevalence of obesity of 12-y-old children calculated against the prevalence of obesity within the same cohort at 6 y old revealed that a significant risk for development of obesity during the elementary school years applied only to boys from around 1993 onward in Kagoshima City and applied throughout the study period in nationwide Japan. CONCLUSION: Obesity prevalence increases for boys during elementary school years but does not significantly increase for girls. A rising trend for becoming obese before starting elementary school was present for both boys and girls over the period 1989-2001. Educational programs to improve nutrition and physical activity, especially for boys, are becoming increasingly necessary.

Platelet-derived endothelial cell growth factor expression is an independent prognostic factor in colorectal cancer patients after curative surgery.

AIMS: Platelet-derived endothelial cell growth factor (PD-ECGF) is an angiogenic factor that undergoes increased expression in colorectal carcinomas, but its prognostic value is a topic of debate. The aim of this study is to clarify the prognostic value of PD-ECGF expression in colorectal carcinomas. METHODS: PD-ECGF expression was measured by enzyme-linked immunosorbent assay in frozen materials from 134 colorectal cancer patients who had received curative resections. Patients were divided into high expression and low expression groups based upon selected cut-off value. Correlations among PD-ECGF expression, clinicopathologic features, and disease-free interval were studied by univariate and multivariate analysis. To evaluate the origin of PD-ECGF, serial sections of the 134 tumours were stained for PD-ECGF and CD68. RESULTS: PD-ECGF expression in the normal mucosa was 34.4+/-15.5 (Units/mg protein) and the cut-off value was 65.4 (mean+2SD). There were no significant correlations between clinicopathological features and PD-ECGF expression. The disease-free interval for the high PD-ECGF expression group was significantly longer than that of the low expression group (P=0.05). A multivariate Cox's regression analysis revealed that high PD-ECGF expression is an independent factor for better outcome. In immunohistochemical study, almost all tumour cells were negative for PD-ECGF, but stromal macrophages were predominantly positive for PD-ECGF. CONCLUSIONS: The PD-ECGF expression originated from stromal macrophages was a predictor for favorable outcome after curative resections for colorectal cancer.

Who is becoming overweight during the elementary school years?

OBJECTIVE: To determine the risk of becoming overweight for every first grader during the elementary school years and to determine whether the overall risk of becoming overweight for first graders is increasing. STUDY DESIGN: A descriptive study using school-based surveys of 12,588 boys and 12,264 girls who entered elementary school between 1989 and 1994. Six years later, the follow-up survey was conducted. Overweight was defined using the BMI percentile cut-off points. MEASUREMENTS: For every 5th percentile rank of first graders, the odds ratio for becoming overweight at seventh grade was calculated. A hockey stick regression analysis and the yearly trend of the risk for becoming overweight at 7th grade were also investigated. RESULTS: For overweight children in first grade, the odds ratio for staying at the same level was extremely high in both boys (35.0) and girls (63.9). The threshold effects of the BMI percentile value at first grade for becoming overweight were the 81st and 87th percentiles for boys and girls, respectively, according to the hockey stick model. The overall risk for becoming overweight significantly increased in boys during the study period (P=0.009). CONCLUSION: The present study determined the exact level of the risk for becoming overweight for every first grader at a different BMI percentile rank. The risk of overweight children in first grade who stayed at the same level at seventh grade was higher in girls than in boys. On the other hand, the trend of the entire population for becoming overweight presents only in boys. The different pattern of the trend of population for becoming overweight by sex during elementary school period may provide evidence to understand and predict overweight in adolescents and adults.

A simple method for evaluating abnormal lengthening of the QT interval during the face immersion test.

The slope of the relation between the unadjusted QT interval and heart rate during the face immersion test has been reported to be useful as an index for predicting an abnormal lengthening of the QT interval for children with nonfamilial long QT syndrome. Our goals were to determine whether we can replace the slope of the QT/heart rate relation calculated from all data with that calculated from fewer data and to determine whether we can replace the slope with the corrected QT value by heart rate (QTc value) at the minimum heart rate. We studied 19 children with a prolonged QT interval and 54 control children by using statistical analysis. The slope calculated from the selected data points (at least four) was in agreement with the slope calculated from all data, and the relationship between the slope and the QTc value at the minimum heart rate showed a high correlation. It was determined that we can replace the slope calculated from all data with that calculated from at least four data points and replace the slope with the QTc value at the minimum heart rate as an index for predicting an abnormal lengthening of the QT interval.

Idiopathic severe pulmonary hypertension in an infant with pulmonary infection.

We report a 5-month-old infant who showed typical echocardiographic findings of primary pulmonary hypertension without the typical histopathological findings and who recovered from severe pulmonary hypertension. Histopathological findings revealed mild thickening of small pulmonary arteries and activated macrophages in the lung. Some cases with idiopathic severe pulmonary hypertension in infants are associated with pulmonary infection.

Mutational analysis of BRCA1 and BRCA2 and clinicopathologic analysis of ovarian cancer in 82 ovarian cancer families: two common founder mutations of BRCA1 in Japanese population.

We analyzed genetic alterations in BRCA1 and BRCA2 genes among 82 ovarian cancer families in Japan. The clinical characteristics of BRCA-associated ovarian cancer patients were compared with cases carrying no mutations as well as with population controls. Using a direct sequencing method, 45 of the 82 ovarian cancer families were found to carry BRCA1 or BRCA2 germ-line mutations (40 with BRCA1 and 5 with BRCA2). In 24 independent mutations of BRCA1, 5 recurrent mutations were found and 2 of them, the L63X and Q934X mutations, were detected in seven and eight independent families, respectively. In addition, 16 mutations of BRCA1 and 3 mutations of BRCA2 have never been described previously. In consideration of clinicopathological features, there was a significantly higher proportion of tumors with serous adenocarcinoma and of cases of advanced stages in the BRCA1 or BRCA2 cases than in those of the controls. On the other hand, there were no differences of mean age at diagnosis between patients with BRCA1 or BRCA2 mutation and those of the controls. Our results indicate that the features of BRCA-associated ovarian cancer in Japan appear to be similar to those in Western countries, and the L63X and Q934X mutations of BRCA1 appear to be common founder mutations unique to the Japanese population.

HLA-A*26, HLA-B*4002, HLA-B*4006, and HLA-B*4801 alleles predispose to adult T cell leukemia: the limited recognition of HTLV type 1 tax peptide anchor motifs and epitopes to generate anti-HTLV type 1 tax CD8(+) cytotoxic T lymphocytes.

Genetic risk for adult T cell leukemia (ATL) has been implicated by ethnic and familial segregation of ATL patients from HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). To clarify the genetic risk for ATL, we characterized HLA class I alleles of ATL patients and analyzed the anchor motifs of HTLV-1 peptides binding to HLA class I molecules, using 291 lines of anti-HTLV-1 CD8(+) cytotoxic T lymphocytes (CTLs) generated in vitro with a total of 165 synthetic peptides for HTLV-1 Tax and Env proteins. Allele frequencies of HLA-A*26, B*4002, B*4006, and B*4801 were significantly higher in ATL patients than in HAM/TSP patients and asymptomatic HTLV-1 carriers in southern Japan. CD8(+) CTL analysis revealed the HTLV-1 Tax peptide sequence to completely lack anchor motifs of peptides binding to HLA-A*26,B*4002, and B*4006 molecules but to possess one anchor for HLA-B*4801, while the HTLV-1 Env peptide sequence had many anchor motifs for HLA-A*26, B*4002, B*4006, and B*4801 molecules. Most ATL patients featured heterozygous HLA class I alleles composed of HLA-A*26, B*4002, B*4006, and B*4801, with a lower number of HTLV-1 Tax peptide anchor motifs and epitopes generating anti-HTLV-1 Tax CD8(+) CTLs than individuals possessing other HLA alleles. The relationship between Tax epitope and ATL incidence was verified by the significantly decreased number of HTLV-1 Tax epitopes in ATL patients compared with asymptomatic HTLV-1 carriers (p < 0.01) as well as late onset ATL patients (p < 0.001). These results indicate that HLA-A*26, B*4002, B*4006, and B*4801 alleles predispose to ATL because of the limited recognition of HTLV-1 Tax peptide anchor motifs and epitopes capable of generating anti-HTLV-1 Tax CD8(+) CTLs.

Severe cervical kyphosis in osteopathia striata with cranial sclerosis: case report.

We report a 29-month-old girl with osteopathia striata with cranial sclerosis (OS-CS), who showed several unusual manifestations, including short stature, muscular hypotonia, short lingual frenulum, an accessory ear and a granuloma at the oral edge. The most unusual distressing finding was severe cervical kyphosis with a dysplastic cervical spine. MRI revealed impingement of the upper spinal cord. To clarify the mode of inheritance of this disease in this patient, we performed a methylation-specific PCR analysis. It eventually showed random inactivation of X-chromosomes, suggesting an autosomal dominant trait.

Localization of a novel susceptibility gene for familial ovarian cancer to chromosome 3p22-p25.

We performed genome-wide linkage analysis in 58 patients and nine unaffected members among 28 families with no mutation in BRCA1 or BRCA2, employing a set of 410 microsatellite markers. We initially screened the whole genome, including the X chromosome, by a non-parametric method using the GENEHUNTER program. As a result, chromosome 3p22-p25 showed a suggestive score for linkage [LOD = 3.49 and non-parametric LOD (NPL) = 2.77 at D3S3611] based on a multipoint analysis. Additionally, based on a two-point analysis using dense markers, this 3p22-p25 region showed a P-value < 0.05 at 10 markers and there is suggestive evidence for linkage at two markers within approximately 19 cM (NPL = 2.60 and 2.49 at D3S1597 and D3S3611, respectively). To explore whether the candidate gene in this 3p22-p25 region contributed to carcinogenesis of familial ovarian cancer in a similar fashion to the tumor suppressor gene, we performed loss of heterozygosity (LOH) analysis. It was observed that the frequency of LOH at four markers in this region was >50% only in tumor tissues from patients with no mutation in BRCA1 or BRCA2, not in those with a BRCA1 mutation.

Erythromycin attenuates an experimental model of chronic bronchiolitis via augmenting monocyte chemoattractant protein-1.

The mechanisms underlying the therapeutic efficacy of erythromycin (EM) in diffuse panbronchiolitis (DPB) was investigated. For this purpose, an experimental rabbit model of DPB induced by Pseudomonas aeruginosa inoculation was employed. Daily administration of EM (3 mg x kg x day(-1)) led to an increase in the number of macrophages in bronchoalveolar lavage fluid (BALF) at an early phase, while reducing the size of granulomatous lesions at the late phase without affecting the number of viable bacteria recovered from the infected lung. Reverse transcriptase polymerase chain reaction (RT-PCR), enzyme-linked immunosorbent assay (ELISA) and immunohistochemical studies showed that monocyte chemoattractant protein (MCP)-1 was produced in both BALF and infected lung. EM treatment resulted in a significant increase in the level of MCP-1 in BALF, while reducing that of tumour necrosis factor (TNF)-alpha, interleukin (IL)-1beta and IL-8. EM also increased MCP-1 messenger ribonucleic acid (mRNA) and protein expression in the infected lung. MCP-1 blockade abolished the protective effect of EM, as neutralization of MCP-1 with anti-MCP-1 antibodies reduced the EM-induced increase in the number of macrophages in BALF, and augmented size of the granulomatous lesions, as compared to control. The results of the present study suggest that erythromycin attenuates the pulmonary granuloma formation, at least in part, by increasing the production of monocyte chemoattractant protein-1.

The interval between flexible sigmoidoscopy screening examinations can be expanded beyond five years.

BACKGROUND/AIMS: As one of the methods for colorectal cancer screening, asymptomatic average-risk persons aged > or = 50 years are recommended to undergo flexible sigmoidoscopy screening every 5 years. We evaluate whether the interval between examinations can be extended beyond 5 years. METHODOLOGY: A total of 192 asymptomatic average-risk subjects were studied, all of whom had undergone a initial negative examination on a flexible sigmoidoscopy screening at age > or = 50 years and a second examination at least 3 years later. The study population was divided into three groups according to the interval between examinations, which was 3-5 years in Group A, 5-6 years in Group B, and 6-8 years in Group C. RESULTS: The incidence of neoplasms was compared among the three subjects groups, and it was found to be similar: 11/96 (11.5%) in group A, 4/55 (7.3%) in group B, and 5/41 (12.2%) in group C. All detected adenomas were less than 10 mm in diameter, and none contained a villous component or high-grade dysplasia. No cancers were found in the study. CONCLUSIONS: The results suggest that the interval for screening sigmoidoscopy may be extended beyond 5 years in persons showing negative results on an initial examination.

Therapeutic time-window of a group IIA phospholipase A2 inhibitor in rabbit acute lung injury: correlation with lung surfactant protection.

OBJECTIVE: We attempted to determine whether group IIA secretory phospholipase A2 (sPLA2-IIA) blockade after the onset of lung injury exerted therapeutic efficacy in the treatment of oleic acid (OA)-induced acute lung injury by using S-5920/LY315920Na, a novel specific inhibitor of sPLA2-IIA, with special interest in the changes of lung surfactant. DESIGN: Prospective animal study. SETTING: University laboratory. SUBJECTS: Forty Japanese white rabbits. INTERVENTIONS: The rabbits, under anesthesia, were endotracheally intubated and mechanically ventilated and then were divided into the following groups: OA + vehicle groups, intravenous infusion of OA for the first 2 hrs (0.1 mL x kg(-1) x hr(-1)) with the addition of vehicle (1 or 2 hrs after OA administration, each n = 9, total 18 rabbits); OA + S-5920/LY315920Na groups, treated identically to the OA control with the addition of S-5920/LY315920Na (1 mg/kg bolus followed by infusion at 0.5 mg x kg(-1) x hr(-1)) after OA (1 or 2 hrs after OA administration, each n = 9, total 18 rabbits); saline control groups, treated with saline instead of OA with the addition of vehicle (1 hr after OA administration, 4 rabbits). Arterial blood gas, lung mechanics, lung inflammation, lung surfactant phospholipids, and production of inflammatory mediators in the lung were measured. MEASUREMENTS AND MAIN RESULTS: Treatment with S-5920/LY315920Na 1 hr after OA infusion, but not 2 hrs after infusion, significantly attenuated the lung injury, as estimated by hypoxemia, decreased lung compliance, pulmonary edema, and vascular permeability. The therapeutic efficacy was similar to that found in our previous pretreatment study. The treatment after 1 hr dramatically inhibited OA-induced surfactant degradation in the bronchoalveolar lavage fluid (BALF), without affecting the concentrations of thromboxane A2, leukotriene B4, and interleukin-8 in BALF. The degree of surfactant degradation in BALF paralleled well with the severity of the lung injury. Furthermore, recombinant human sPLA2-IIA reproduced the similar hydrolysis pattern of isolated surfactant in vitro, which was inhibited by S-5920/LY315920Na. CONCLUSIONS: Our results indicate that therapeutic blockade of sPLA2-IIA ameliorated lung dysfunction via protection of surfactant degradation in an animal model of acute lung injury, and they suggest a new strategy in treating clinical acute lung injury.