Research progress in molecular mechanism of blast lung injury / 中华创伤杂志

Lung is one of the most sensitive target organs of human beings under the shock waves. Due to its serious injury, rapid development and high mortality, blast lung injury has been a widely concerned research topic in the field of military medicine. In the normal physiological state, the body is in a dynamic balance between pro-inflammaton and anti-inflammation, oxidation and anti-oxidation, promoting apoptosis and inhibiting apoptosis. While blast lung injury breaks the balance and causes physiological, biochemical and pathological changes in the body, seriously leading to acute respiratory distress syndrome and multiple organ dysfunction syndrome, and eventually the mortality. So far, the researches on blast lung injury mainly involve damage model, pathogenesis, pathological changes, intervention treatment and so on, which has achieved great research findings. In the review, the authors summarize the progress of molecular mechanism for blast lung injury from the perspective of inflammatory reaction, oxidative stress, apoptosis and so on, which may promote the discovery of new targets for the diagnosis, treatment and rehabilitation intervention of blast lung injury.

Cloning of silkworm 3-hydroxyisobutyrate dehydrogenase gene and its expression patterns analysis in simulated weightless environment / 生物工程学报

The full length cDNA of silkworm hibadh gene was cloned by RT-PCR and RACE (Rapid amplification of cDNA ends) technique. The hibadh gene and its deduced amino acid sequences were analyzed. The tissue distribution of hibadh gene in 5th instar silkworm larvae was tested by RT-PCR. The expression patterns of hibadh gene in simulated weightless environment were analyzed by real time RT-PCR. The results showed that the full length hibadh cDNA sequence was 1074 bp in lenth, including an open read frame of 969 bp encoding the entire coding region of Hibadh (GenBank accession No. EU719652). The deduced amino acid sequence similarities of hibadh between silkworm and Burkholderia ambifaria, Drosophila melanogaster, Apis mellifera, Xenopus tropicalis, Mus musculus, Homo sapiens were 46%, 43%, 48%, 44%, 45%, 45%, respectively. Signal peptide analysis showed that Hibadh was a secretory protein. There wasn't glycosyl-phosphatidyl inositol anchor site in Hibadh amino acid sequence. Molecular weight and isoelectric point of Hibadh were 34.1 kD and 9.14 respectively. The RT-PCR tests indicated that the hibadh gene expressed in head, silk gland, midgut, cuticle, blood, fat body, tuba malpighii of the 5th instar silkworm larvae. There were different expression patterns of hibadh gene during different silkworm embryo period in simulated weightless environment. Simulated weightlessness resulted in the expression of silkworm hibadh gene up regulated 2.3-fold (P < 0.05), up regulated 4.6-fold (P<0.01), down regulated 7.6-fold (P < 0.01), down regulated 2.6-fold (P < 0.05) during apophysis formation period, inverse period, trachea formation period, and whole embryo period, respectively. There was no significant change of hibadh gene expression during other period of silkworm embryo between simulated weightless and control groups. There were different response patterns to simulated weightless environment between hibadh gene and whole body of silkworm. Gene showed much higher sensitivity compared to whole body in response to environment. This study is useful for the further research on the gravity biological mechanism of hibadh gene.

An inquiry to experimental conditions and cell-counting assays in reconstituted basement membrane invasion experiment in vitro / 解放军医学杂志

Objective To explore the most suitable chemostatic condition and a method of cell-counting in reconstituted basement membrane invasion experiment in vitro. Method Reconstituted basement membrane invasion experiment was employed, and conditioned medium, fibronectin (FN), and a combination of conditioned medium and FN were respectively used as chemoattractants was placed in the lower compartment of the chamber. After the filters were stained with hematoxylin and eosin (HE), two kinds of cell-counting methods were employed. One was random cell-counting to count the cells in 5 fields infiltrated in the different areas of the filter membrane under 40?magnification, and the other was whole cell-counting of the infiltrating cells on the whole filter membrane with 4? magnification and image analysis system. Results The number of infiltrating cells in the presence of the chemoattractants was much larger than that of the control group. The number of infiltrating cells of the conditioned medium group was larger than that of FN group. The numbers of infiltrating cells in the combination of conditioned medium and FN groups were significantly larger than those of conditioned medium and FN alone groups. The accuracy of method of random cell-counting under 40? magnification was poorer than that of whole cell-counting with image analysis system. Conclusion Chemoattractants exert strong effect on the tumor cells invasion, and different chemoattractants show different chemotactic abilities. By using image analysis system to count all the infiltrative cells of the whole filter membrane is an objective and accurate cell-counting method.