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Biomedical subjects

J Shang

Publications and source records attributed to J Shang.

33 records · Page 2Linked to original sources
PubMed1999

[One-stage reconstruction with the pedicle skin flap of forehead for defective tissue of head-neck tumors dissection].

OBJECTIVE: To discuss the feasibility on reconstructing the defective tissue with the pedicle skin flap of forhead after head-neck tumors dissection. METHOD: 14 patients with advanced head-neck tumors were studied, whose defective tissues were reconstructed by their forehead skin flaps. The flap area ranged from 5 cm x 11 cm to 7 cm x 16 cm. RESULT: 2 cases of them were partial necrosis, 3 years and 5 years survival rates were 76.9% and 63.6% respectively. The function of breath through nose or mouth and the function of swallow were satisfactory. CONCLUSION: The forehead skin flap should be a good selection for the reconstruction of defective tissue after basicranial and nasalfacial dissection.

Adolescent↗
PubMed1999

[The application of ion detection in the study of spectroscopy of Na2].

Ion detection technique has been successfully used in the study of Rydberg states of Na2 by pulse optical-optical double resonance. High-lying Rydberg states near ionization limit have been observed and high sensitive and high gain spectra have been obtained. This technique is very useful for molecular spectroscopy.

English Abstract↗
PubMed1998

Sp1 cooperates with the ets transcription factor, GABP, to activate the CD18 (beta2 leukocyte integrin) promoter.

CD18, the beta chain of the leukocyte integrins, plays a crucial role in immune and inflammatory responses. CD18 is expressed exclusively by leukocytes, and it is transcriptionally regulated during the differentiation of myeloid cells. The ets factors, PU.1 and GABP, bind to three ets sites in the CD18 promoter, which are essential for high level myeloid expression of CD18. We now identify two binding sites for the transcription factor, Sp1, that flank these ets sites. Sp1 is the only factor from myeloid cells that binds to these sites in a sequence-specific manner. Mutagenesis of these sites abrogates Sp1 binding and significantly reduces the activity of the transfected CD18 promoter in myeloid cells. Transfection of Sp1 into Drosophila Schneider cells, which otherwise lack Sp1, activates the CD18 promoter dramatically. GABP also activates the CD18 promoter in Schneider cells. Co-transfection of Sp1 and GABP activates CD18 more than the sum of their individual effects, indicating that these factors cooperate to transcriptionally activate myeloid expression of CD18. These studies support a model of high level, lineage-restricted gene expression mediated by cooperative interactions between widely expressed transcription factors.

Animals↗
PubMed1998

SAP90 binds and clusters kainate receptors causing incomplete desensitization.

The mechanism of kainate receptor targeting and clustering is still unresolved. Here, we demonstrate that members of the SAP90/PSD-95 family colocalize and associate with kainate receptors. SAP90 and SAP102 coimmunoprecipitate with both KA2 and GluR6, but only SAP97 coimmunoprecipitates with GluR6. Similar to NMDA receptors, GluR6 clustering is mediated by the interaction of its C-terminal amino acid sequence, ETMA, with the PDZ1 domain of SAP90. In contrast, the KA2 C-terminal region binds to, and is clustered by, the SH3 and GK domains of SAP90. Finally, we show that SAP90 coexpressed with GluR6 or GluR6/KA2 receptors alters receptor function by reducing desensitization. These studies suggest that the organization and electrophysiological properties of synaptic kainate receptors are modified by association with members of the SAP90/PSD-95 family.

Amino Acid Sequence↗
PubMed1998

Study on acupuncture and moxibustion therapy for female urethral syndrome.

Among 180 patients with female urethral syndrome, 128 were treated by acupuncture and moxibustion and 52 by western medicine as controls. The short-term effective rate in the acupuncture and moxibustion group was 90.6% and the long-term effective rate, 80.4%; whereas the short-term effective rate of the control group was 26.9% (P < 0.01). The maximal uroflow rate increased by an average of 4.6 ml/s, after acupuncture and moxibustion treatment (P < 0.001) and the mean uroflow rate increased by an average of 3.1 ml/s (P < 0.001); on the contrary, no changes were found in the control group (P > 0.05). Sixty-nine cases from the acupuncture and moxibustion group and 39 from the control group were subjected before and after treatment to determinations of the maximal bladder pressure, maximal abdominal pressure, bladder-neck pressure, and maximal urethral closure pressure during urination. All these indexes were decreased remarkably in the acupuncture and moxibustion group, while no changes were observed in the control group.

Acupuncture Therapy↗
PubMed1998

[Childhood rhadomyosarcoma in head and neck].

2 cases childhood rhadomyosarcoma in head and neck were reported, both patients were treated by surgery, radiotherapy or chemotherapy. The pathologic type, clinical stage, diagnosis, treatment and prognosis of the childhood rhadomyosarcoma were discussed.

Child↗
PubMed1998

[Rapid determination of essential fatty acids of edible oils by conversion to their hydroxamic acids].

A simple and rapid HPLC method for the determination of essential fatty acids of edible oils was established. Oil samples were converted to their hydroxamic acids in a single step and analyzed without prior separation and purification. The chromatographic conditions were: Shim-pack CLC ODS, 5 microns, 150 mm x 6.0 mm i.d. column, 40 degrees C; MeOH: 0.02 mol/L NaH2PO4(pH 3.0) (81:19, V/V) as eluent and UV-213 nm detector. The linear range was 0.05-0.6 g/L, recovery was 96.93% and RSD was 1.80%(n = 4). The relative standard deviations for intra-day and inter-day assays were 1.24% and 1.62% respectively (n = 6). For 18:3, 18:2, 18:1, the difference between the derivatization yields from triglycerides and their methyl esters was almost one fold. That was confirmed by our recovery and determination results. The calibration curves for the oil samples should not be obtained from the derivatization of their methyl ester standards.

Chromatography, High Pressure Liquid↗
PubMed1997

Backfoot, a novel homeobox gene, maps to human chromosome 5 (BFT) and mouse chromosome 13 (Bft).

Homeobox genes play important roles in limb development. Backfoot is a recently identified mammalian homeobox gene whose temporal and spatial expression pattern during limb development suggests that it is a key component for specifying the identify and structure of the hindlimb. Here we report the chromosomal mapping of the Backfoot locus in human (BFT) and mouse (Bft). Using single-strand conformation analysis of PCR products amplified from a panel of somatic cell hybrid lines and two radiation hybrid (RH) panels, we have physically mapped BFT to human chromosome 5, closely linked to STS markers D5S2543, D5S458, D5S1947, and D5S1995 on the Stanford G3 RH map and to AFMA057VG5 and AFM350YB1 on the Gene-Bridge 4 RH map. Linkage analysis of a mouse inter-specific backcross panel (C57BL/6J x Mus musculus spretus) has localized Bft to the central part of mouse chromosome 13. The map position of Bft is near two mouse limb mutant loci defined as dumpy and mdac.

Animals↗
PubMed1997

Backfoot is a novel homeobox gene expressed in the mesenchyme of developing hind limb.

Homeobox genes play important roles in pattern formation during development. Here, we report the cloning and temporal and spatial expression patterns of a novel homeobox gene Backfoot (BFT for the human gene, and Bft for the mouse gene), whose expression reveals an early molecular distinction between forelimb and hind limb. BFT was identified as a sequence-specific DNA-binding protein. In addition to the homeodomain, it shares a carboxyl-terminal peptide motif with other paired-like homeodomain proteins. Northern hybridization analysis of RNAs from human tissues revealed that human BFT is highly expressed in adult skeletal muscle and bladder. During midgestation embryogenesis, mouse Bft is expressed in the developing hind limb buds, mandibular arches, and Rathke's pouch. The expression of Bft begins prior to the appearance of hind limb buds in mesenchyme but is never observed in forelimbs. At later stages of limb development, the expression is progressively restricted to perichondrial regions, most likely in tendons and ligaments. The timing and pattern of expression suggest that Bft plays multiple roles in hind limb patterning, branchial arch development, and pituitary development. Bft is likely identical to a mouse gene, Ptx1, that was recently isolated by Lamonerie et al. ([1996] Genes Dev. 10:1284-1295) and that has been suggested to play a role in pituitary development.

Adult↗
PubMed1997

Research on the schizont cell culture vaccine against Theileria annulata infection in Xinjiang, China.

Theileria annulata infection (TAI) is one of the most serious diseases of cattle in Xinjiang Autonomous Region of Uigur Minority Nationality. It has been recorded in 14 prefectures, except the Tulufan Prefecture, but the enzootic areas are mainly distributed around the Zhunger Basin and Talim Basin. According to the records collected in the ten years before vaccination with the schizont cell culture vaccine was carried out, the average incidence rate of TAI in enzootic areas was 7.22% and the mortality rate was 24%. The milk production of cattle suffering from TAI was sharply decreased, and there were usually abortions in pregnant cows. The incidence rate and mortality rate were greater in high grade cattle, so TAI was a constraint to improving cattle breeds. To control this disease effectively in Xinjiang, researchers at the Xinjiang Academy of Animal Science began to study the schizont cell culture vaccine in 1972. In 1977 an immortalised cell line was achieved from a primary cell culture starting with white blood cells from cattle suffering from acute TAI caused by an artificial tick bite. The cell culture medium mainly consisted of calf serum, lactalbumin-hydrolysate, Eagles' medium DMEM and three antibiotics. As a vaccine, the above cells were mixed with preserving medium containing gelatin. This paper describes the experiments on the immunological properties of the vaccine carried out in subsequent years. Up to 1996, vaccine doses for 1,186,150 cattle have been produced and sold. This vaccine has had a critical effect on the control of TAI in Xinjiang. Owing to the sharp decrease in the incidence rate and mortality rate of TAI after cattle were vaccinated, the annual economic benefit of the vaccine is at least 1,620,000 yuan.

Animals↗
PubMed1997

[Serotype distribution of Actinobacillus actinomycetemcomitans].

A total of 131 Actinobacillus actinomycetemcomitans clinical strains from 28 periodontally healthy or diseased subjects were serologically categorized by indirect enzyme-linked immnosorbent assay. Sepecies-specific and serotype b, c-specific monoclonal antibodies against Actinobacillus actinomycetemcomitans were used. Preliminary data revealed that each subject harbored only one serotype of Actinobacillus actinomycetemcomitans. The distribution of serotype a, b and c were respectively 11%, 21% and 68%, both of periodontally healthy subjects harbered serotype b, 7 of 9 juvenile periodontitis subjects harbered serotype c, 12 of the other subjects which included 3 adult periodontitis and 14 gingivitis harbered serotype c.

Adolescent↗
PubMed1994

Human mitochondrial transcription termination exhibits RNA polymerase independence and biased bipolarity in vitro.

Human mitochondrial 16 S rRNA 3'-end formation requires a tridecamer template sequence and a trans-acting protein of approximately 34 kDa. This protein binds tightly to its target sequence and further analysis of the protein-DNA complex revealed that the DNA is bent. Either T3, T7, Escherichia coli, or yeast mitochondrial RNA polymerase produced transcripts mapping at this termination site. With these heterologous RNA polymerase, RNA 3'-end formation was detected only in the transcription polarity opposite that of mitochondrial rRNA synthesis; the efficiency of termination in the homologous human RNA polymerase system is approximately 2-fold greater in this same opposite polarity. These results suggested the possible importance of biased bipolar transcription termination in vivo. For wild-type mtDNA, the apparent relative efficiency of termination in vivo reflected the values determined in vitro. Examination of a pathogenic human mtDNA mutation known to result in impaired termination in vitro showed no significant differences in relative transcript abundances in vivo, despite a loss of in vitro termination efficiency in both directions. Recently, six additional mitochondrial disease-associated point mutations have been reported that cluster at the human mitochondrial transcription termination site. None of these resulted in significantly impaired transcription termination in vitro.

Base Sequence↗
PubMed1992

Indoor air pollution and pulmonary function in children.

Pulmonary function in winter time in 1,343 school children aged 10-13 years was measured in four cities located in northern and southern part of China. The results showed that FVC, FEV1, PEF, V75, V50 and V25 in children living in homes with coal stoves were decreased by 1.5-10.7% compared with children living in homes with gas or LPG stoves in Chengde and Shanghai. In contrast to this, no significant difference in pulmonary function was found in Shenyang and Wuhan. It suggested that this phenomenon was related to indoor air pollution, and partly related to passive smoking or outdoor air pollution.

Air Pollution, Indoor↗
PubMedDate not supplied

Trioxsalen in the presence of UVA is able to induce nuclear factor kappa B binding activity in HaCaT keratinocytes.

It has been described that treatment of cells with high dose psoralen and UVA induce the production of reactive oxygen species (ROS) leading to DNA damage. Transcription factor nuclear factor kappa B (NFkappaB) plays a crucial role in regulating not only cell growth but also cell differentiation, and ROS seem to be partly involved in these mechanisms. The aim of this research was to find out the effect of a combined treatment with trioxsalen (TMP)/UVA on NFkappaB binding activity in HaCaT keratinocytes. HaCaT keratinocytes were treated with 27 microg/l TMP. This concentration did not affect the proliferation rates, nor was it toxic, as shown by cytotoxicity assays. After treatment with TMP with or without UVA (1 J/cm(2)), NFkappaB binding activity in nuclear protein extracts was measured by electrophoretic mobility shift assays. The effect on cytokines and cytokine receptor genes was investigated using cDNA expression arrays. An inhibitory effect on NFkappaB binding activity was found between 30 and 60 min after TMP supplementation of the culture media. UVA irradiation induced a 2-fold increase in NFkappaB binding activity in TMP supplemented HaCaT keratinocytes compared with the non-irradiated control. In addition, NFkappaB binding activity was higher after UVA irradiation with TMP than in UVA irradiated cells in the absence of TMP. TGF-alpha, IL-1R, IL-2Ralpha, IL-12beta and PDGF expression was induced by UVA. However, all of them except PDGF were inhibited by combined TMP/UVA treatment. Using an inhibitor of NFkappaB activation, we found out that under these conditions, these cytokines or cytokine receptor genes are apparently not regulated by NFkappaB. Our results indicate that a combined TMP/UVA treatment of HaCaT keratinocytes induces NFkappaB binding activity, and that this is a synergistic effect. The investigated cytokines, and cytokine receptor genes do not seem to be NFkappaB regulated; however, TMP shows anti-inflammatory capacities in vitro.

Cell Division↗