Objective In view of being short of the mammalian model in neuroma-in-continuity,the experiment injured the part of peroneal nerve to the formation of the neuroma-in-continuity and was applied to the foundation of farther research.Methods Twelve New Zeland rabbits were selected as experimental sub- jects randomly.One lateral peroneal nerves of twelve rabbits were resected,the damaged nervous tissues' slice were showed to the typical pathological changes of neuroma by the stain of HE,luxol fast blue after six weeks. As compared with the health sides of six model rabbits,the methods of real-time PCR and Western blot were used to evaluate the expression of CNTF,CGRP mRNA and protein in injured nerves and L_7、S_1 dorsal root ganglions respectively.Results The injured nerve formed the typical pathological changes of neuroma at six weeks.Compared with hea|thg side the expression of CNTF mRNA and protein was down-graded at the lateral of neuroma(P＜0.05),and the expression of CGRP mRNA and protein was up-graded(P＜0.05).Con- clusion The method of partly injuring the peroneal nerve could effectively set up the model of the neuroma-in- continuity,furthermore,resulted to the expression changes of the CNTF,CGRP mRNA and protein.

Objective To evaluate the clinical outcome of external bracket fixation in the treat- ment of complex tibia diaphysis fracture involving intra-articular fractures.Methods Forty-two cases of complex tibia diaphysis fracture with proximal and distal intra-articular fractures treated surgically in our hospital from January 1999 to January 2004 were analyzed.The complex tibia diaphysis fractures were categorized according to the AO classification as type C2 (multiple segments fracture) and type C3 (ir- regular fracture),proximal and distal intra-articular fractures in 23 and 19 cases,respectively.Definite operation was done within one week.Twenty-two cases were treated with simple external fixator,and 20 cases treated with screws and external fixator.Results All the 42 cases were followed-up regularly. According to AO evaluation of the knee and ankle joint movement,83% (35/42 cases) of the cases gained satisfactory functional outcome,14% (6/42 cases) had quite satisfactory results and 2% (1/42 case) had unsatisfactory functional outcome.Conclusion External bracket fixation can obtain outcome of relative length of the tibia and fibula,tube structure reconstruction,smoothness of the articular surface and the parallel and symmetric relation of knees and ankles for complex tibia diaphysis fracture with proxi- mal and distal intra-articular fracture.The arthritis resulting in pain in movement and restriction of func- tion is considered to be the most important factor affecting the joint function.Early functional exercise is important for best recovery of knee and ankle function.

Natural killer (NK)/T-cell lymphomas represent a rare type of lymphoma derived from either activated NK cells or cytotoxic T cells. They are most commonly extranodal and tend to present as destructive lesions within the midline facial structures. Other than the nasal cavity and Para nasal sinuses, several other extra nodal sites of involvement have been reported, including the pharynx, gastrointestinal tract, and testis. Occasionally, pleural effusion has also been observed. Here, a case of lymphoma of NK/T-cell type presented as pleural effusion was reported. The patient was previously misdiagnosed as B cell non-Hodgkin's lymphoma by pathological and immunohistochemistry (IH) analysis for pleural membrane biopsy specimen. After the analysis of the pleural fluid cells by a combination of morphologic, immunophenotypic, cytogenetic and molecular (MICM) methods in Beijing Dao-Pei hospital, some lymphoblasts were found morphologically, which expressed cytoplasmic CD3 (cCD3) and CD56 by flow cytometry analysis and had a clonal T-cell receptor gamma (TCR-gamma) gene rearrangement by molecular analysis, so that the diagnosis was finally corrected as NK/T-cell lymphoma and an allogeneic stem cell transplantation was successfully performed. In conclusion, this unusual case highlights the significance of MICM combined techniques for the diagnosis of lymphoma, as well as an unusual presentation of a rare disease and the successful treatment.
Cytological Techniques ; Humans ; Lymphoma, Extranodal NK-T-Cell ; complications ; diagnosis ; Male ; Middle Aged ; Natural Killer T-Cells ; Pleural Effusion ; diagnosis ; etiology

To explore the effect and mechanism of Guhong injection against cerebral ischemia reperfusion injury, SD rats were randomly divided into the sham-operated group, the model group, the nimodipine group, and high, medium and low-dose Guhong injection groups, with 10 rats in each group. The middle cerebral artery embolization (MCAO) model was established to observe neurological deficit symptoms, infarct volume, SOD activity, MDA content, GSH-Px and CAT activity in rats, as well as the contents of t-PA, PAI, TXB2 and 6-keto-PGF1α in serum. The results showed that Guhong injection could obviously promote the recovery of neurological deficit symptoms, narrow the brain infarct volume in rats after surgery, significantlyincrease the activities of SOD, GSH-Px and CAT and decrease the content of MDA. Meanwhile, it also could obviously increase the contents of t-PA and 6-keto-PGF1α and decrease the contents of PAI and TXB2 in serum, indicating that Guhong injection have better antioxidant and antithrombus effects, as well as a significant protective effect against cerebral ischemia reperfusion injury in rats.
Animals ; Antioxidants ; pharmacology ; Brain Ischemia ; drug therapy ; Catalase ; metabolism ; Drugs, Chinese Herbal ; pharmacology ; Injections ; Male ; Malondialdehyde ; metabolism ; Random Allocation ; Rats ; Rats, Sprague-Dawley ; Reperfusion Injury ; drug therapy ; Superoxide Dismutase ; metabolism

To investigate the biological characteristics of the variant translocation der ins (17;15) in a patient with acute promyelocytic leukemia (APL), the conventional G-banding technique, interphase fluorescence in situ hybridization (int-FISH), RT-PCR, gene scanning, gene sequence and flow cytometry were performed. The results indicated that the variant translocation der ins (17, 15) observed by G banding technique was a rare type, the int-FISH assay by using dual-color pml/raralpha fusion probes confirmed the cytogenetic findings. The detection results of other molecular methods demonstrated the existence of the whole pml/raralpha fusion gene, while this case had insertion variant translocation. This patient got complete remission by using combined chemotherapy, and survives with continuous complete remission during following up for 1 year. In conclusion, the variant translocation der ins (17; 15) is rare type in APL, its incidence is lower, several signal types in detection of int-FISH were observed and the combination chemotherapy for this patient showed more obvious efficacy.
Chromosome Banding ; Chromosomes, Human, Pair 15 ; Chromosomes, Human, Pair 17 ; Humans ; In Situ Hybridization, Fluorescence ; methods ; Interphase ; genetics ; Leukemia, Promyelocytic, Acute ; genetics ; Male ; Translocation, Genetic ; Young Adult

OBJECTIVETo report two de novo acute myeloid leukemia (AML) patients with t(11;22)(q23;q11.2) and summarize the clinical and biological characteristics.

METHODSBone marrow cells morphology, immunophenotype, chromosome karyotype, fluorescence in situ hybridization (FISH), PCR and gene sequencing were performed. Clinical manifestation and routine laboratory tests were analyzed.

RESULTSThe patients were diagnosed as AML-M₂ and AML-M₅ by morphology and immunophenotype results. Both patients carried t(11;22)(q23; q11.2) and one of them carried an additional chromosome abnormality. MLL-SEPTIN5 fusion transcript was identified in two patients by RT-PCR and sequencing. The two patients got hematologic complete remission after induction chemotherapy with daunorubicin, homoharringtonine, and cytarabine (DHA) or daunorubicin and cytarabine (DA). One of them relapsed and died during consolidation therapy with intermediate-dose cytarabine.

CONCLUSIONLeukemia with t(11;22)(q23;q11.2) chromosome translocation met the clinical and laboratory manifestations of AML. The MLL-SEPTIN5 fusion transcript was the distinctively biological etiology. Patients with t(11;22)(q23;q11.2) were vulnerable to relapse after conventional chemotherapy and had poor prognosis. Allogeneic hematopoietic stem cell transplantation should be recommended as early as possible.

Adult ; Chromosome Aberrations ; Chromosomes, Human, Pair 11 ; Chromosomes, Human, Pair 22 ; Female ; Humans ; Karyotyping ; Leukemia, Myeloid, Acute ; diagnosis ; drug therapy ; genetics ; Male ; Prognosis ; Translocation, Genetic

This study was purposed to analyze the characteristics of morphology, immunology, cytogenetic and molecular biology of leukemia cells in 12 AML patients with Ph(+) and their correlation with survival of patients. 12 patients with Ph(+) AML were diagnosed according to diagnostic criteria of WHO and existence of t(9;22) (q34;q11) or t(9;22) abnormality, meanwhile no evidence of CML chronic phase was observed. The results showed that 8 out of 12 cases were confirmedly diagnosed to be AML by morphologic and immunophenotypic examination, 4 cases were diagnosed as myeloid and B lymphocytic mixed acute leukemia. The Ph chromosome was detected in 10 cases by chromosome analysis at the first time of diagnosis, and some of the cases had coexistence of complex chromosome and/or normal karyotype. BCR-ABL transcript was detected in all 12 cases, including 7 cases with b3a2, 1 case with b2a2, 1 case with b2a2 variants, 2 cases with e1a2 and 1 case with e18a2. The 12 cases all got complete remission after chemotherapy and/or gleevec treatment, out of them 3 cases received chemotherapy and gleevec treatment, but 2 cases died; 9 cases received allogeneic hematopoietic stem-cell transplantation (allo-HSCT), 1 case died from relapse, among them 1 case died from transplant complications. The median survival was 24 (8 - 80) months, the overall survival of 3 years was (51.4 ± 17.7)%. It is concluded that the Ph(+) AML is a acute myelogenous leukemia with poor prognosis, but long-term survival may be achieved with HSCT as quick as after complete remission from gleevec and chemotherapy treatment. Meanwhile, the detection of BCR-ABL gene and it variants may be give more opportunity for diagnose and treatment, which can be used as routine screening for newly diagnosed leukemia.
Adult ; Child ; Female ; Hematopoietic Stem Cell Transplantation ; Humans ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive ; diagnosis ; Male ; Middle Aged ; Precursor Cell Lymphoblastic Leukemia-Lymphoma ; diagnosis ; Prognosis

OBJECTIVETo investigate the effect of DNA methyltransferases 1 (DNMT-1) inhibition on the ACC-M cells in vitro and in vivo and discuss the role of DNMT-1 in the development, invasion and metastasis of salivary adenoid cystic carcinoma (SACC).

METHODSACC-M cells of stable DNMT-1 inhibition were established in a previous research. In vitro, the growth and invasion of ACC-M cells which stably inhibited DNMT-1 were detected and analyzed by methyl thiazolyl tetrazolium (MTT) growth curve, flow cytometry, plating efficiency and invasion assay. In vivo, the growth and metastasis of ACC-M cells which persistently inhibited DNMT-1 were observed and analyzed by subcutaneous injection and tail vein injection into the nude mice.

RESULTSIn vitro, the doubling time [(34.7 +/- 2.1) h], S phase fraction [(17.4 +/- 1.7)%], plating efficiency [(43.0 +/- 1.3)%] of ACC-M cells was significantly different from those of blank [(26.2 +/- 3.1) h, (31.5 +/- 2.0)%, (71.0 +/- 4.7)%], empty load control [(28.4 +/- 3.9) h, (39.0 +/- 2.0)%, (66.0 +/- 5.2)%], P < 0.05, and the invasion ability was not significantly different among these groups (P > 0.05). In vivo, the subcutaneous tumor forming rate (6/10), volume [(2.18 +/- 0.83) mm(3)], weight [(0.0156 +/- 0.0046) g] of ACC-M cells was also significantly lower than that of blank [10/10, (155.44 +/- 1.67) mm(3), (0.0724 +/- 0.0157) g], empty load control [10/10, (147.46 +/- 1.73) mm(3), (0.0729 +/- 0.0177) g], P < 0.05, but the rate of lung metastasis was not significantly different among these groups (P > 0.05), and the masses (2.0 +/- 0.5), diameter (70.0 +/- 20.3) microm of ACC-M cells was significantly lower than that of blank [(28.0 +/- 5.5), (195 +/- 25.4) microm], empty load control [(27.0 +/- 4.5), (190.0 +/- 19.9) microm], P < 0.05.

CONCLUSIONSInhibition of DNMT-1 is able to inhibit the proliferation and metastasis of ACC-M cells in vitro and in vivo.

Animals ; Carcinoma, Adenoid Cystic ; enzymology ; pathology ; secondary ; Cell Line, Tumor ; Humans ; Lung Neoplasms ; secondary ; Mice ; Mice, Nude ; Neoplasm Invasiveness ; Repressor Proteins ; antagonists & inhibitors ; Salivary Gland Neoplasms ; enzymology ; pathology

OBJECTIVETo investigate the changes in the morphology and cytoskeleton (CSL) content of the CSL in the colonic smooth muscle cells (SMCs) of rats in early postscald stage, so as to elucidate the mechanism of dysfunction of gastrointestinal motility.

METHODSSeventy Wistar rats were randomly divided into normal control (n = 10, without scald) , and scald ( n = 60, with 10 cm x 7 cm wound inflicted on the back) groups. The colonic smooth muscle tissue of 10 normal rats and scalded rats were harvested at 1, 3, 6, 12, 24 and 48 postscald hours( PSH) and divided into two parts: one for histologic examination, and the other for the detection of CSL changes in the colonic smooth muscle tissue by flowcytometry method.

RESULTSThe electron microscope examination showed that the arrangement of cytoskeleton of SMC of the scalded rats during 1 to 3 PSH was disordered, and sparse, and the condensed area was uneven, with fragmentation. But the morphology and distribution of CSL gradually restored to normal state during 6 to 12 PSH, and it approached that of normal group at 48 PSH. The CSL content in the colonic smooth muscle tissue of scalded rats was obviously increased at 1 PSH (610+/-23) , decreased thereafter, evidently lower than that in control group at 3 PSH (92+/-17) , and then it started to increase at 12 PSH, exceeding the normal value at 24 PSH, and continued to rise until 48 PSH. There was significant difference in CSL content in the colonic smooth muscle tissue of the rats between scald and control group ( P < 0.05 or 0. 01).

CONCLUSIONChanges in the morphology and CSL content in the colonic smooth muscle tissue can be observed at early stage after a scald, which imply the kinetic balance between damage and repair in the body. In addition, changes in CSL content in the colonic smooth muscle tissue may be important factors in producing colonic dysfunction, damage of intestinal wall structure, and dynamic abnormalities of the colonic smooth muscle.

Actins ; metabolism ; Animals ; Burns ; metabolism ; pathology ; Colon ; cytology ; Cytoskeleton ; ultrastructure ; Disease Models, Animal ; Microtubules ; Myocytes, Smooth Muscle ; cytology ; metabolism ; Rats ; Rats, Wistar

Metabolic engineering is the analysis of metabolic pathway and designing rational genetic modification to optimize cellular properties by using principle of molecular biology. Aromatic metabolites such as tryptophan, phenylalanine, and tyrosine are essential amino acids for human and animals. In addition, phenylalanine is used in aspartame production. Escherichia coli and many other microoganism synthesize aromatic amino acids through the condensation reaction between phospho-enolpyruvate (PEP) and erythrose-4-phosphate(E4P) to form 3-deoxy-D-arabinoheptulosonate 7-phosphate(DAHP). But many enzymes compete for intracellular PEP, especially the phosphotransferase system which is responsible for glucose transport in E. coli. This system uses PEP as a phosphate donor and converts it to pyruvate, which is less likely to recycle back to PEP. To channel more carbon flux into the aromatic pathway, one has to overcome pathways competing for PEP. ppsA and tktA are the key genes in central metabolism of aromatic amino acids biosynthesis. ppsA encoding phosphoenolpyrucate synthetase A (PpsA) which catalyzes pyruvate into PEP; tktA encoding transketolase A which plays a major role in erythrose-4-phosphate (E4P) production of pentose pathway. We amplified ppsA and tktA from E. coli K-12 by PCR and constructed recombinant plasmids of them in pBV220 vector containing P(R)P(L) promoter. Because of each gene carrying P(L) promoter, four productions of ligation were obtained. The monoclonal host containing recombinant plasmids was routinely grown in Luria-Bertani (LB) medium added Ampicillin at 37 degrees C overnight, and then inoculated in LB (Apr) medium by 3%-5% in flasks on a rotary shaker at 30 degres C, induced at 42 degrees C for 4.5 hours when OD600 = 0.4, cells were obtained by centrifugation at 10,000 r/min at 4 degrees C. The results of SDS-PAGE demonstrated that the bands at 84kD and 73kD were more intensive than the same ones of the controls. The specific activity of PpsA in crude extracts was increased by 10.8-fold, and TktA, by 3.9-fold. When both genes were co-expressed in E. coli, the activity of PpsA varied from 2.1-9.1 fold comparing to control, but the activity of TktA was relatively stable(3.9-4.5 fold). Whatever the two genes were expressed respectively or cooperatively, both could promote the production of DAHP, the first intermediate of the common aromatic pathway, but co-expression was more effective on forming DAHP. The results demonstrate that co-expression of ppsA and tktA can improve the production of DAHP to near theoretical yield. This report details a different strategy based on co-expression of two genes in one vector in vivo to release the burden and paves the way for construction of genetic engineering bacteria for further research.
Electrophoresis, Polyacrylamide Gel ; Escherichia coli ; enzymology ; genetics ; metabolism ; Escherichia coli Proteins ; genetics ; metabolism ; Plasmids ; genetics ; Polymerase Chain Reaction ; Promoter Regions, Genetic ; genetics ; Pyruvate Synthase ; genetics ; metabolism ; Transketolase ; genetics ; metabolism