Development and Application of the Reverse Genetic Technologies for Infectious Bursal Disease Virus / 病毒学报

Infectious bursal disease virus (IBDV) is an important member of the Birnaviridae family. IBUV mainly targets the bursa of Fabricius, the central immune organ of chicken, resulting in chicken infectious bursal disease (IBD). IBD represents one of the great challenges for ongoing development of the poultry industry. Reverse genetics for IBDV emerged over twenty years ago. Since then, the technologies behind virus rescue have continually improved leading to a deep understanding of IBDV gene function and tailored vaccine development. Our lab has also been instrumental in the field of IBDV research. Here we review studies on the pathogenic mechanism and the effective prevention and control of IBD.

Different patterns of notching on doppler graph and hemodynamics in patients with pulmonary hypertension / 中华急诊医学杂志

Objective To investigate whether simple visual assessment of FVERVOT(the right ventricular outflow tract Doppler flow velocity envelop) graphs aids in hemodynamic differentiation. Method The hemodynamics, echocardiography, and clinical data of 88 patients with pulmonary hypertension (PH) were reviewed. The FVERVOTgraphs were categorized into normal pattern (no notch; NN), late systolic notch pattern (LSN) or mid-systolic notch pattern (MSN). Results The pulmonary vascular resistance (PVR) was highest in the MSN pattern (9.2±3.5 WU; P＜0. 001), in comparison with LSN (5,7 ±3. 1 WU) and NN (3.3±2.4 WU) patterns. The ratio of stroke volume to pulse pressure (compliance) also varied with different patterns of FVERVOr graph (MSN = 1.2 ± 0. 5; LSN = 1.7 ± 0.8; NN = 2.6 ± 1. 7, P = 0.001 and 0.04 respectively compared with NN). The specificity and sensitivity of MSN were 96% and 71%, respectively in case of a PVR ＞ 5 WU (PPV 98%). In the patients with PH, any notching pattern of FVERVOT graph was highly associated with PVR ＞ 3 WU (OR = 22.3, 95 % CI: 5.2 ～ 96.4), whereas the NN pattern predicted a PVR ≤3 WU and pulmonary artery wedge pressure (PAWP) ＞ 15 mmHg (OR =30.2, 95%CI: 6.3 ～ 144.9). Conclusions Visual inspection of the shape of the FVERVOT graphs provides insight into the hemodynamic status of patients with PH.

Screening proteins interacting with infectious bursa disease virus Gt VP2 from cDNA library of B lymphoid cells of the bursa of Fabricius / 生物工程学报

To screen the interactive proteins with IBDV Gt VP2 protein from cDNA library of B Lymphoid cells of the bursa of Fabricius. The expression cDNA library plasmids was transformed to the yeast competent cells, which have the bait plasmid-Gt VP2. After testing for growth in synthetic complete medium lacking histidine and uracil and for production of beta-galactosidase (X-gal), we obtained 16 positive clones. We searched the gene sequences of positive clones in the NCBI website. The blast results showed that five positive clones were the gallus sequences. They were Gallus gallus breed mitochondrial DNA, O_G1cNAc transferase, Tumor protein p53 binding protein, Stathmin and Chondroitin sulfate Ga1NAcT-2, respectively. This study is helpful for the further identifying the receptors of IBDV in B Lymphoid cells of the bursa of Fabricius.

The importance of blood pressure response to Valsalva maneuver in patients with puhnonary hypertension / 中华急诊医学杂志

Objective To use a simple bedside technique to verify the pathophysiological mechanism of pulmonary hypertension (PH) in different races. Method The Valsalva maneuver (VM) was performed in patients referred to a specialty PH clinic. The blood pressure response of patients to VM was in different fashions. The blood pressure (BP) was measured by using cuff and stethoscope. When the cuff was inflated to 15 mmHg above the systolic pressure, sound could be heard by auscultation during VM and when the cuff was deflated the sound disappeared over 3 heart beats which was considered as abnormal BP response, and less than 3 heart beats defined as normal BP response. The right heart catheterization in patients with PH as a part of the standard evaluation. Results This study included 84 patients with a mean age of (63 ± 16) years. Those with abnormal BP response to VM had higher pulmonary artery wedge pressure (PAWP) [(22.5±6.6) vs. (11.9±4.3) mmHg, P ＜0.0001] and lower pulmonary vascular resistance [(5.8 ± 4.0) vs. (8.1 ± 4.6 ) WU, P = 0.01]. Blood pressure response to VM did not correlate with mean pulmonary artery (PA) pressure [(46.2 ± 9.9) vs. (43.4 ±10.4) mmHg, P =0.20] or cardiac index (both 2.4 ± 0.6 L/min/m2). The abnormal BP response to VM had high sensitivity (89.4%), specificity (86.1%) and accuracy (86.9%) for determining PAWP＞ 15 mmHg.Conclusions BP response to Valsalva maneuver provides important information about left heart filling pressures in patients with PH.