An isolate of rice stripe virus (designated as RSV-YL) was purified. The particles showed to be pleomorphisms under electron microscope, mainly branched filaments of about 80-250 nm in length and about 8 nm in width. There are also some open circular filaments of 3 nm and 8 nm in width, and some filaments of 13 nm in width and 130-190 nm in length. The basic morphism of RSV particles should be filaments of 3 nm in width and various length. By SDS-PAGE analysis, the molecular weight of disease-specific protein (SP) encoded by vRNA4 was 19.9 kDa and that of coat protein (CP) encoded by vcRNA3 was 33.6 kDa. When nucleic acid extracted from the purified RSV was electrophoresed under nondenaturing condition, the size of four dsRNAs (designated as dsRNA1-4 in order of decreasing size) was 4.9×106,2.7×106,2.0×106 and 1.7×106 Da, respectively, and that of four ssRNAs (designated as ssRNA1-4 in order of decreasing size) was 3.0×106,1.2×106,0.9×106 and 0.8×106 Da, respectively. A fifth segment with a size of 0.58×106 Da identified as ssRNA5 associated with the purified virus sometimes. The antiserum against the coat protein further purified by preparative electrophoresis was raised and used to investigate the serological relationships between RSV-CP and RSV-SP, CP and SP of rice grassy stunt virus (RGSV) which is also a member of Tenuivirus. The results showed that RSV-CP had no serological reaction with SP of RSV and PGSV, but could weakly react with antiserum of RGSV-CP, which confirmed that there is distantly evolutionary relationship between RGSV and RSV.

The changes of some parameters of Gray type Ⅰ synaptic interface in the brain of mice treated with desglycinamide-arginine-8-vasopressin (DGAVP) have been analysed quantitatively two hours after DGAVP injection. The animals were killed and the hippocampus and sensori-motor area of cerebral cortex were prepared for electron microscopy. The electron microphotographs were analysed by IBM-PC computer image processing system. The main results of the experiment are as follows:1. The thickness of postsynaptic density apparently increased in both the sensori-motor area of cerebral cortex and CA_3 area of hippocampus after injection of DGAVP (P

Objective:To study the practical value and imaging expression of target reconstruction technique of HRCT in the diagnosis of pneumoconiosis.Methods:Fifty-seven cases with different level type of pneumoconiosis were first examined by routine CT scan,followed by HRCT examination at top of aortic arch,carina of trachea,3 cm below bifurcation of bronchi,and 2 cm above thd right diaphragm.Target reconstruction have been finished using the raw data stored.Results:Target reconstruction photoimages were cleared to display the morphology of delicate lesions of pneumoconiosis:(1)Nodular shape(100%).(2)Interlobular septal thickening(98.24%).(3)Lobular structure abnormality(98.24%).(4)Subpleural nodes (84.21%).(5)Centrilobular emphysema(63.15%).(6)Subpleural line(64.91%).(7)Bronchiectasis(63.15%).(8)Ground-glass opacity(35.08%).(9)Honeycombing(15.78%),and to display earlier period change details.Conclusion:HRCT target reconstruction technique may make lesion dispaly more detail than comventional and high-resblution CT.It is reliable to display the delicate lesions of pneumoconiosis and provide more diagnostic information.

OBJECTIVETo investigate the effects of all-trans-retinoic acid(ATRA) and polyphenon-100 (PP) on genetic instability of human tumor cells via their role in alteration of microsatellite sequence(MS) and the expression of mismatch repair gene hMLH(1) and hMSH(2) in RER(+) (replication error) cells.

METHODSRER(+) colon cancer cell line was used as a host for lipofection with pCMV-CAR in which a foreign (CA)(14) repeat was inserted in the coding sequence of LacZ reporter gene, resulting in misreading LacZ frame. Any mutation which made the base number of (CA)(14) tract to be 3-fold resumed normal reading frame of LacZ, and thus led to expression of beta-galactosidase. Variable expression of LacZ in the transfectant cells resulting from RATA or PP treatment was measured by OD reading at lambda 620 after X-gal staining. Expression of mismatch repair genes of hMLH(1) and hMSH(2) was examined at mRNA level by reverse transcription-polymerase chain reaction (RT-PCR).

RESULTSATRA at 1 mu mol/L, 0.1 u mol/L and PP at 3 mu g/ml had no significant inhibitory effect on cell proliferation. After being treated with ATRA or PP for 1 week, the blue cells of RKO transfectant clones were significantly reduced, and this meant the mutation of exogenous (CA)(14) in RKO cells were inhibited. But no expression of hMLH(1) and hMSH(2) was observed.

CONCLUSIONThe above data showed both ATRA and PP had inhibitory effects on MS instability of cancer and thus demonstrated directly their beneficial role in stabilization of genomic DNA. However, the present authors have not observed any expression of hMLH(1) and hMSH(2) in RKO cells treated with ATRA or PP.

Adaptor Proteins, Signal Transducing ; Carrier Proteins ; Catechin ; pharmacology ; Cell Division ; drug effects ; Colonic Neoplasms ; genetics ; pathology ; DNA-Binding Proteins ; Gene Expression ; drug effects ; Humans ; Lac Operon ; genetics ; Microsatellite Repeats ; genetics ; MutL Protein Homolog 1 ; MutS Homolog 2 Protein ; Mutation ; Neoplasm Proteins ; genetics ; Nuclear Proteins ; Plasmids ; genetics ; Proto-Oncogene Proteins ; genetics ; RNA, Messenger ; drug effects ; genetics ; metabolism ; Transfection ; Tretinoin ; pharmacology ; Tumor Cells, Cultured ; drug effects

OBJECTIVETo investigate the effectiveness and safety of reduced intensity conditioning allogeneic hematopoietic stem cell transplantation (RIC allo-HSCT) in ultra high risk chronic lymphocytic leukemia (CLL) patients with the deletion of p53 to deepen the understanding of allo-HSCT in the treatment of CLL.

METHODSIn this retrospective study, a total of 4 ultra high risk CLL patients with the deletion of p53 in our center between July 2012 and Jan 2014 were enrolled. The RIC regimen was administered and the hematopoietic reconstitution, transplantation related mortality (TRM), overall survival (OS), progress free survival (PFS) were evaluated.

RESULTSWe registered 4 patients with the median age of 56 years (49-61 years), including 3 males and 1 female. The median mononuclear cells (MNC) and CD34(+) cells were 6.54 (2.85-14.7) × 10(8)/kg (recipient body weight) and 5.81 (2.85-7.79) × 10(6)/kg (recipient body weight), respectively. The median time of the neutrophil recovery was 11 days (range of 9-12 days), and the median time of the platelet recovery 5.5 days (range of 0-11 days). Three patients (75%) attained a full donor chimerism at day 28 after transplantation and one (25%) got a mixed chimerism of donor and recipient. During the follow-up at a median time of 26.5 months (range of 21-39 months), 2 (50%) patients developed acute graft versus host disease (aGVHD) grade I and 2 (50%) patients got CMV infection. One patient got herpes zoster virus and EB virus infections. No transplantation related mortality was found in the 4 patients. One patient who was in partial response status progressed 5 months after transplantation, and the other 3 patients remained in durable remission after allo-HSCT.

CONCLUSIONThese results suggested that RIC allo-HSCT showed durable remission, good tolerance and acceptable toxicity, which could be a better option for the treatment of ultra high risk CLL patients with the deletion of p53 and was worth to be investigated and applied widely in future.

Disease-Free Survival ; Female ; Gene Deletion ; Genes, p53 ; Graft vs Host Disease ; Hematopoietic Stem Cell Transplantation ; Humans ; Leukemia, Lymphocytic, Chronic, B-Cell ; genetics ; therapy ; Male ; Middle Aged ; Retrospective Studies ; Transplantation Conditioning ; Treatment Outcome ; Tumor Suppressor Protein p53 ; genetics

OBJECTIVETo study the value of CT quantitativeness in the diagnosis of coal miner's pneumoconiosis.

METHODS104 cases were examined by HRCT scan at top of aortic arc, carina of trachea, 3 cm below the bifurcation of bronchi, among them there were 87 patients with different stages of coal miner's pneumoconiosis, 17 cases of normal males as the control group. All images were determined by CT density histogram at specific region (- 1,024-0 HU). Calculated the percentage of each pixel included a varying number of CT value, and the ratio of density values in the specific region.

RESULTSThe ratio of density values in the region of -983 (-) -778 HU was 87.31% in normal control group, and 80.51%, 75.27% and 72.99% respectively in the I, II, III stages of coal miner's pneumoconiosis. There were statistically significant differences among the groups (P < 0.01).

CONCLUSIONCT quantitative histogram information was able to observe the fibrosis and its degree of coal miner's pneumoconiosis. It has a good diagnostic value for its reliability and objectiveness.

Coal Mining ; Humans ; Pneumoconiosis ; diagnostic imaging ; Pulmonary Fibrosis ; diagnostic imaging ; Tomography, X-Ray Computed ; methods

Objective To explore the clinical efficacy and toxicity of standard-dose IA regimen as induction chemotherapy in treating initially diagnosed acute myeloid leukemia (AML) patients ≥55 years old. Methods A total of 32 patients were enrolled in this study. The remission, survival time and adverse effects after IA regimen were retrospectively analyzed. Results The complete remission (CR) rate, partial remission (PR) rate and overall response (OR) rate were 71.9%(23/32), 9.4%(3/32), 81.3%(26/32) after IA regimen. In favorable, intermediate and poor prognosis groups (grouped by cytogenetic or molecular factors), 6, 14 and 3 cases achieved CR (χ2= 5.571, P= 0.067), 1, 2 and 0 cases achieved PR, while OR rates were 100.0 %(7/7), 84.2 % (16/19), 50.0 % (3/6) (χ2= 2.114, P= 0.359). The median overall survival (OS) time of three groups were 28.07 months (6.57-46.33 months), 16.93 months (0.40-87.57 months) and 3.03 months (2.00-6.00 months) (Z=9.630, P=0.008) and the 2-year OS rates were 83.33%, 46.80%and 0, respectively (χ2=12.206, P< 0.001). Myelosuppression and infections due to neutropenia were the main adverse effects and severe non-hemotologic toxicities were not observed. Conclusion The standard-dose IA regimen can increase CR/OR rate and prolong the median OS time of patients with favorable and intermediate prognosis and it can be used as the first induction chemotherapy regimen for elderly AML patients of ≥55 years old.

Objective:To investigate the effect of obesity on the efficacy of allogeneic hematopoietic stem cell transplantation.Methods:The clinical data of 81 patients who underwent allogeneic hematopoietic stem cell transplantation from August 2017 to September 2020 in the First Affiliated Hospital of Nanjing Medical University were retrospectively analyzed. According to the body mass index (BMI), the patients were divided into the obese group (BMI≥28 kg/m 2, 11 cases) and the non-obese group (BMI<28 kg/m 2, 70 cases). The clinicopathological characteristics, hematopoietic stem cell implantation, post-transplantation complications, survival and recurrence were compared between the two groups. Univariate and multivariate survival analyses were performed by using Cox proportional hazards regression model. Results:The median follow-up time of 81 patients was 280 d (8-1 218 d). The 1-year overall survival (OS) rate was 77.9%, and the 1-year progression-free survival (PFS) rate was 73.8%. The 1-year OS rates of the non-obese group and the obese group were 82.6% and 46.2% ( χ2 = 15.54, P<0.01), and the 1-year PFS rates were 82.1% and 36.4% ( χ2 = 15.56, P<0.01). The non-recurrence mortality (NRM) rates of the non-obese group and the obese group were 7.1% and 32.7% ( χ2 = 6.463, P = 0.01), and the cumulative recurrence rate was 11.5% and 42.9% ( χ2 = 8.146, P = 0.004). Between the non-obese group and the obese group, the median engraft time of neutrophils and platelets, acute graft-versus-host disease, chronic graft-versus-host disease, hemorrhagic cystitis, cytomegalovirus infection and Epstein-Barr virus infection had no statistical difference ( P > 0.05). The result of multivariate analysis showed that obesity was an independent adverse influencing factor for OS of patients with allogeneic hematopoietic stem cell transplantation ( HR = 3.814, 95% CI 1.343-10.827, P = 0.012). Conclusion:Obesity is an important unfavorable factor that affects patient's survival after allogeneic hematopoietic stem cell transplantation, and the improvement of the efficacy and survival of these patients is worthy of further study.

Objective To research the procedure for creating an animal model of mitral regurgitation by implanting a device through the apical artificial chordae tendineae, and to assess the stability and dependability of the device. Methods Twelve large white swines were employed in the experiments. Through a tiny hole in the apex of the heart, the artificial chordae tendineae of the mitral valve was inserted under the guidance of transcardiac ultrasonography. Before, immediately after, and one and three months after surgery, cardiac ultrasonography signs were noted. Results All models were successfully established. During the operation and the follow-up, no swines died. Immediately after surgery, the mitral valve experienced moderate regurgitation. Compared with preoperation, there was a variable increase in the amount of regurgitation and the values of heart diameters at a 3-month follow-up (P<0.05). Conclusion In off-pump, the technique of pulling the mitral valve leaflets with chordae tendineae implanted transapically under ultrasound guidance can stably and consistently create an animal model of mitral regurgitation.

OBJECTIVETo investigated the curative effect of autologous hematopoietic stem cell transplantation (ASCT) for malignant lymphoma.

METHODSThe clinical data of 81 patients with malignant lymphoma received ASCT from April 1999 to October 2013 were retrospectively analyzed. Of 81 patients, 70 were non-Hodgkin's lymphoma (NHL) and 11 Hodgkin's lymphoma (HL). High dose of etoposide combined with G-CSF was used to mobilize peripheral hematopoietic stem cell. Preconditioning regimen was BEAM (carmustine + cytarabine + etoposide + melphalan).

RESULTSEnough peripheral blood stem cells were collected from all patients. All of the patients after transplantation achieved hematopoietic reconstitution, the median time of the absolute neutrophil count (ANC) recovery to >0.5×10⁹/L time was 10(7-16) d, and the median time of platelet count recovery to >20×10⁹/L was 10(6-17) d. With the follow-up of 23(2-139) months, progression free survival (PFS) was 72.7%, and overall survival (OS) was 88.6%. The median PFS and OS were not reached. Complete remission (CR) before ASCT was an independent prognostic factor of PFS. No transplant related death happened.

CONCLUSIONASCT was a safe and effective method for treatment of malignant lymphoma.

Adolescent ; Adult ; Aged ; Female ; Hematopoietic Stem Cell Transplantation ; Humans ; Lymphoma ; therapy ; Male ; Middle Aged ; Retrospective Studies ; Transplantation, Autologous