Essential thrombocythemia (ET) which is a clonal disease of hematopoietic stem cell mainly reflects hyperplasia of megakaryocyte. Childhood ET is characterized by persistance of thrombocytosis, mild to moderate hepatomegalia and splenomegalia, thrombogenesis and hemorrhage complications. The pathogenesis of ET is obviously associated with the abnormal or disturbance expression of multiple genes, micro RNAs,immunological molecules and some chromosome aberration. This review will focus on recent developments in the pathogenesis of ET in molecular biology, immunology and cytogenetics.

Objective To explore the role of mental health between nursing interns' professional commitment and occupational choice self-efficacy.Methods 200 students were surveyed by Career Decisionmaking Self-efficacy Scale,the Symptom Self-rating Scale(SCL-90) and Professional Commitment Scale for Undergraduates.Results Professional commitment showed remarkable positive prediction effect.Mental health exhibits moderating effect on the relationship between professional commitment and occupational choice self-efficacy,the more good mental health level,the bigger the prediction effect of professional commitment on occupational choice self-efficacy.Conclusions Promoting the students' psychological health will improve prediction effect of professional commitment on occupational choice self-efficacy.

Extracorporeal membrane oxygenation (ECMO) is an extracoreal life support technique,which is used as a method of cardiopulmonary replacement therapy for patients who had cardiopulmonary nonfiction.ECMO may obtain precious time for evaluation,diagnosis,treatment and restitution of dangerous diseases.This paper introduced the research progression of ECMO on relative knowledge,clinical application in pediatrics,complication and its prevention and cure in applied process.This review on ECMO will deepen understanding and widen the vision on clinical application of ECMO in pediatrics further.

As a member of homeobox gene family,HOXA7 is a main gene to control hematopoietie cell proliferation and differentiation.The expression and function of HOXA7 in leukemia ale regulated by many upstream elements.and affected by synergism molecules and other homeobox genes. It can induce leukemia through acting on downstream target genes.HOXA7 affects the clinical manifestation of leukemia and overexpression is closely associated with poor therapeutic reaction and prognosis.

ICU is the important place of ventilator associated pneumonia, the occurrence of fatality rate in patients with ventilator associated pneumonia is higher. In this paper, the cause of the ventilator associated pneumonia in ICU and nursing research progress are summarized, that enhance their awareness of the importance of nursing care and the use of normative evidence-based nursing in clinical practice thinking and nursing process, explore the nursing methods of more appropriate, to reduce the incidence of ventilator associated pneumonia in ICU is of great help.

Objective:To elucidate the effect of osteogenic growth peptide (OGP) on proliferation and differentiation of human periodontal ligament cells on titanium disc in vitro. Methods:Human periodontal ligament cells were cultured located on titanium disc individually in medium contained various concentrations of OGP;and cell proliferation quantity were examined by MTT and alkaline phosphatase activity were examined by enzyme-linked immunosorbentassay. Results:In vitro,the addition of OGP in cultures resulted in an increase of cell proliferation and ALP activity(P

Hypoxia-inducible factor (HIF) is an important transcriptional factor,which plays crucial role in response to hypoxia.HIF is highly expressed in many human cancers,and it is closely related to tumor angiogenesis.HIF promotes tumor growth,invasion and metastasis via up-regulating vascular endothelial growth factor gene and starting associated angiogenesis.With the in-depth study of HIF regulation of tumor angiogenesis mechanism,HIF is expected to become an important target for anti-angiogenesis therapy.

Objective To analyse clinical and imaging characteristics of congenital airway abnormalities,and to guide the clinical diagnosis and reduce rate of missed diagnosis and misdiagnosis.Methods Clinical and imaging characteristics in children who had been diagnosed congenital airway abnormalities in Shengjing Hospital of China Medical University from 2005 to 2011 were reviewed and analysed retrospectively.Results Of 23 children,12 cases were male,11 cases were female,the age was from 1 month to 10 years,the average age was 32 months.The disease course was from 3 days to 3 months,an average was 18 days.Clinical manifestations were repeated coughing,wheezing,dyspnea and recurrent respiratory infection.Through the spiral CT and three dimensional reconstruction,enhanced CT examination,6 cases of tracheobronchial stenosis,3 cases of trachea and bronchus,1 case of dysplasia of the left pulmonary artery and vein,3 cases of pulmonary sequestration,4 cases of pulmonary cyst and 6 cases of pulmonary hypoplasia were found.Conclusion Missed diagnosis and misdiagnosis of congenital airway malformations often occurs.When the following features were observed,congenital airway malformations may be taken into account:persistent cough; repeated or persistent wheezing,treated ineffectively with anti-inflammatory agent and bronchodilators ; recurrent or persistent stridor; repeated pulmonary infections,dyspnea; repeated or persistent pneumonia in the same part and unexplainedly mediastinal shift in X ray chest radiography.Spiral CT three dimensional reconstruction and enhancement is of great value in diagnosis of airway malformation.

Objective To observe the effects of vascular endothelial growth factor(VEGF)from pulmonary stromal cells on differentiation and function of mature dendritic cells (mDC) and the immune tolerance. Methods Co-culture system of murine pulmonary stroma cells (MPSC)/mDC was established as control group,and VEGF-Ab add-on treatment to co-culture cells as experimental group.Cytokines secreted from pulmonary stroma cells were detected by RT-PCR.The expression of cellular phenotype and ability of the mDC-induced T cells reproductive activity were detected by flow cytometry and CCK-8,respectively.Results CD86 expression of VEGF-Ab group was higher than of control group (P ＜ 0.05).There was no difference in the ability of mDC-induced T cells reproductive activity between the two groups(P＞0.05).Conclusions VEGF might be involved in the regulation of immune tolerance by reducing expression of CD86 in dendritic cells.

Homeobox gene family encode a kind of transcription regulatory factors,which can specifically combine and regulate target genes,control embryonic development,cell proliferation and differentiation.Several subfamilies of homeobox gene famiy are associated with the early stage of differentiation and development of nervous system,whose abnormal expression explain the occurrence and development of nervous system diseases.Further study between homeobox gene family and nervous system can help to prevent and treat that diseases.