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Biomedical subjects

X Fu

Publications and source records attributed to X Fu.

At least 73 records · Page 4Linked to original sources
PubMed2000

Recombinant bovine basic fibroblast growth factor accelerates wound healing in patients with burns, donor sites and chronic dermal ulcers.

OBJECTIVE: To evaluate the effect of recombinant bovine basic fibroblast growth factor (rbFGF) on accelerating healing of burn wounds, donor sites and chronic dermal ulcers in multicenters. METHODS: One thousand and twenty-four patients with burns, donor sites and chronic dermal ulcers were recruited for this prospective and multicenter clinical trial and another 641 patients with the similar wounds were used as controls. All patients were divided into three groups: burn group, donor site group, and chronic dermal ulcer group. In the burn group, 654 patients with superficial second-degree burns(superficial II degree) or deep second-degree burns(deep II degree) were treated topically with either recombinant bovine basic fibroblast growth factor (rbFGF plus vehicle, rbFGF 150 AU/cm2/day, 330 patients) or placebo (vehicle without rbFGF, 324 patients). In the donor site group, 509 patients were treated with rbFGF and 317 patients with placebo in a similar way as described elsewhere. In the chronic dermal ulcer group, 185 patients were treated with rbFGF and the controls were themselves. Photography, histological evaluation and clinical examination were used to evaluate the results of wound healing. RESULTS: All of superficial second-degree burns, deep second-degree burns and the donor sites treated with recombinant bovine basic fibroblast growth factor had an accelerated rate of granulation tissue formation and epidermal regeneration as compared with that in the controls. Superficial second-degree burns and deep second-degree burns treated with recombinant bovine basic fibroblast growth factor healed in 9.89 +/- 2.45 and 17.04 +/- 4.56 days, respectively, whereas the average healing time in those receiving placebo was 12.35 +/- 2.74 and 21.21 +/- 4.88 days. The donor sites treated with rbFGF or placebo healed in 10.68 +/- 4.55 and 14.74 +/- 6.46 days, respectively. All chronic dermal ulcers except 12 patients treated with rbFGF healed within 6 weeks. Histological evaluation of punch-biopsy specimens from the burn wounds, donor sites and chronic dermal ulcers seven days after treatment supported the impression of accelerated wound healing after rbFGF treatment. CONCLUSIONS: rbFGF is effective in shortening the wound healing time and improving the wound healing quality. Accelerating wound healing is of clinical benefit in reducing the length of hospitalization, costs and emotional burden of the patient.

Adolescent↗
PubMed2000

[Clinical study on treatment of advanced non-small cell lung cancer with Chinese herbal medicine combined with synchronous radio- and chemotherapy].

OBJECTIVE: To explore the effect of applying Chinese herbal medicine according to Syndrome Differentiation of TCM combined with synchronous radio- and chemotherapy (combination therapy) in treating advanced non-small cell lung cancer (NSCLC). METHODS: The 56 patients in the group A were treated with combination therapy, and the 44 patients in the group B treated with synchronous radio- and chemotherapy, while the 34 patients in the group C treated with non-synchronous radio- and chemotherapy. The efficacy of treatment in the three groups were observed and compared. RESULTS: The immediate effective rate in the A, B, C groups was 87.5%, 84.1% and 55.9% respectively, that in the group A and B was better than that in the group C (P < 0.01). The median survival time in the three groups was 16.4, 11.8 and 10.6 months respectively. The 2-year and 3-year survival rate in the group A were markedly higher than those in the group B (P < 0.05), moreover, the clinical symptoms, Karnovsky scoring and immune function were obviously improved in the group A (P < 0.05, P < 0.01). CONCLUSION: Effect of the combination therapy is superior to that of synchronous radio- and chemotherapy alone in improving immune function, elevating quality of life and prolongating survival time of patients with NSCLC.

Adenocarcinoma↗
PubMed2000

[The expressions of transcription factor c-fos mRNA and its protein in the burn wound of rats].

OBJECTIVE: To investigate the rule of the expression in different time points of wound tissue transcription factor c-fos mRNA and its protein after burn, so as to explore the role of c-fos in the initiation of burn wound injury and repairing. METHODS: Male Wistar rats were inflicted with partial thickness scalding of 30% TBSA on the back. In situ hybridization and immunohistochemical methods were used to evaluate the characteristics and pattern of the changes in the expressions of the c-fos mRNA and its protein in normal skin and in the wounded skin at 3 h, 6 h, 1 d, 3 d, 7 d and 14 d postburn, respectively. RESULTS: It was found by light microscopy (LM) that c-fos mRNA and its protein could be found expressed in normal skin and obviously increasingly expressed in wounded skin. The expression of fos protein reached peak level at 3 postburn hour (PBH) and that of its mRNA at 6 PBH. CONCLUSION: The expression of c-fos mRNA and its protein could be induced during burn injury. But the postburn increase in the expression of its gene appeared later than that of its protein, suggesting that the early-appeared fos protein acted through its post-translational modification of preexisting fos molecule.

Animals↗
PubMed2000

[The significance and characteristics of the gene expressions of c-fos and c-jun in hypertrophic scar and chronic ulcer tissues].

OBJECTIVE: To explore the characteristics and regularity of the expression of c-fos and c-jun genes in hypertrophic scar and chronic ulcer tissues and their relationship to different tissue restoration. METHODS: Tissue samples of hypertrophic scars were harvested from 16 cases of patients after burns and chronic cutaneous ulcers during operation together with the normal skin (n = 5) of the same patients as control. ABC method was employed to detect the gene expression of both c- fos and c-jun in above samples. RESULTS: The positive expression of c-fos and c-jun gene was found in epithelial basal cells and some subcutaneous fibroblasts in normal skin. But the expression of c-jun was weaker than that of c-fos in above tissues. A strong positive expression of c-fos and c-jun genes was found mainly in fibroblasts in the hypertrophic scar. But the combined expression of both tumor genes was most often found in the capillary endothelium, some inflammatory cells and the cytoplasm of fibroblasts in ulcer tissue. CONCLUSION: The results indicated that the amount and location of the expression of c-fos and c-jun genes were different in the three kinds of tissues, suggesting that these two tumor genes may play important roles in wound healing modulation.

Adult↗
PubMed2000

[Preparation of galactosyl-insulin with double saccharide density and a study of its hepatic targeting property].

This study was intended to improve the technical procedure so as to increase the saccharide density of galactosyl-recombinant insulin and elevate its liver targeting property. Using a branched compound 3,5-dihydroxy benzoic acid as the base of a conjugating bridge, the authors prepared a new double galactosyl-recombinant insulin, whose saccharide density being two times as high as that of galactosyl-recombinant insulin. The double gal-insulin conjugate, gal-insulin conjugate and original insulin were labeled with 131I, and then the three kinds of 131I labeled compounds were tested in rabbit whole body imaging to measure their properties of liver targeting. The peak values of rabbit liver concentration for double gal-insulin, gal-insulin and original insulin were 59.5%, 43.8% and 21.5%, respectively. These results demonstrate that for elevating the liver targeting property of galactosyl-recombinant compounds, a branched agent like 3,5-dihydroxyl benzoic acid can be adopted as an effective medium.

Animals↗
PubMed2000

[Content analysis on gardenoside in grown and ungrown fruits of Gardenia from different habitats].

This paper reported content analysis on gardenoside in grown fruits of Gardenia from different habitats and ungrown fruits of Gardenia jasminoides and G. jasminoides f. longicarpa. The results were as follows: (1) The content of gardenoside in G. jasminoides from indigenous region of Jiangxi was higher than other habitats; (2) The content of gardenoside in G. jasminoides f. longicarpa was the highest; (3) The content of gardenoside in fruits of growth period of G. jasminoides and G. jasminoides f. longicarpa had two peak stages.

Chromatography, High Pressure Liquid↗
PubMed2000

[Raman and infrared spectroscopic investigation of SO4(2-)/TiO2 solid acids].

The structure, crystal phase transition and surface acid centers of SO4(2-)/TiO2 solid acids calcined at different temperatures were studied by IR and Raman spectroscopy. The results showed that SO4(2-) is combined with metal ions of TiO2 in a chelating bidentate mode. When the calcination temperature is below 500 degrees C, the samples possess stable structure with anatase as the main crystal phase, and there are two types of acid sites (Lewis and Bronsted acid) on the samples, the amount of B acid is about twice as that of L acid. When the temperature is above 500 degrees C, surface SO4(2-) desorb gradually with increasing calcination temperature, leading to crystal phase transition from anatase to rutile and the surface B acid sites fade away.

Acids↗
PubMed2000

[Comparative studies on the spectral behavior between SO4(2-)/TiO2 and TiO2 photocatalysts].

The differences of spectral behavior between SO4(2-)/TiO2 and TiO2 photocatalysts were studied by using IR, Raman as well as UV-Vis diffuse reflectance spectroscopy(DRS). The results showed that both L and B acid sites exist on SO4(2-)/TiO2 photocatalyst while only L acid sites on TiO2 photocatalyst. As compared with unmodified TiO2, the sulfated TiO2 (SO4(2-)/TiO2) exhibits higher resistance to crystal phase transition from anatase to rutile, higher resistance to growth of crystal grain. As the results of sulfation, SO4(2-)/TiO2 samples possess higher anatase content, smaller crystal grain, and the blue-shifted band edge of adsorption spectra, which increases the optical absorption threshold value and yield larger redox potential.

Adsorption↗
PubMed2000

[FT-Raman spectroscopic investigation on stomach cancer].

FT-Raman spectroscopy was used to investigate 40 normal and malignant tissues from stomach. Statistic analysis shows that the bands related to OH, NH, C=O stretching and H-O-H bending are stronger in malignant tissues. This phenomenon suggests that the hydrogen bonding systems among water and protein vary in malignant tissues.

Humans↗
PubMed1999

Fibroblast growth factor protects the kidney against ischemia-reperfusion injury.

Ischemia-reperfusion injury, a common source of renal dysfunction in adults, is associated with tubular epithelial cell damage. Since fibroblast growth factors (FGF) attenuated tissue injury after transient myocardial ischemia, we hypothesized that acidic fibroblast growth factor (aFGF; FGF-1) would attenuate renal ischemia-reperfusion injury. We studied the effects of FGF-1 in a rat model of acute renal failure induced by bilateral renal ischemia (60 min) and 1, 2 or 7 days reperfusion. After FGF-1 administration at the onset of renal reperfusion, there was less functional impairment of the kidneys. The histological changes were not as severe as in controls. Increases in serum creatinine and blood urea nitrogen 24 h after reperfusion were attenuated by 35% (p< 0.01) and by 53% (p< 0.001), respectively, in FGF-1-treated animals compared to vehicle-treated rats. The ischemia/reperfusion-induced increase in tissue myeloperoxidase, a marker of neutrophil infiltration, was mitigated (67% reduction, p< 0.05) with FGF-1 treatment. As shown by histology, neutrophil infiltration and tubular cell necrosis in medulla were less pronounced (p< 0.0001 and p< 0.05, respectively) in animals receiving FGF-1. Furthermore, ischemia-induced apoptosis, prevalent in tubular cells of the cortex, was also attenuated by FGF-1-treatment (83% reduction, p< 0.0001). Pretreatment of animals with Nw-nitro-L-arginine (L-NNA), an inhibitor of nitric oxide synthase, abolished the attenuating effects of FGF-1 on neutrophil infiltration, suggesting that nitric oxide might participate in the anti-inflammatory effects of FGF-1 in this experimental design. Our data support a role for FGF-1 in attenuation of renal damage or failure after ischemia-reperfusion injury of the kidney, in part at least by inhibition of neutrophil infiltration.

Animals↗
PubMed1999

EB-1, a tyrosine kinase signal transduction gene, is transcriptionally activated in the t(1;19) subset of pre-B ALL, which express oncoprotein E2a-Pbx1.

The t(1;19) translocation of pre-B cell acute lymphocytic leukemia (ALL) produces E2a-Pbx1, a chimeric oncoprotein containing the transactivation domains of E2a joined to the homeodomain protein, Pbx1. E2a-Pbx1 causes T cell and myeloid leukemia in mice, blocks differentiation of cultured myeloid progenitors, and transforms fibroblasts through a mechanism accompanied by aberrant expression of tissue-specific and developmentally-regulated genes. Here we investigate whether aberrant gene expression also occurs specifically in the t(1;19)-containing subset of pre-B cell ALL in man. Two new genes, EB-1 and EB-2, as well as Caldesmon were transcriptionally activated in each of seven t(1;19) cell lines. EB-1 expression was extremely low in marrow from patients having pre-B ALL not associated with the t(1;19), and elevated more than 100-fold in marrow from patients with pre-B ALL associated with the t(1;19). Normal EB-1 expression was strong in brain and testis, the same tissues exhibiting the highest levels of PBX1 expression. EB-1 encodes a signaling protein containing a phosphotyrosine binding domain homologous to that of dNumb developmental regulators and two SAM domains homologous to those in the C-terminal tail of Eph receptor tyrosine kinases. We conclude that aberrant expression of tissue-specific genes is a characteristic of t(1;19) pre-B ALL, as was previously found in fibroblasts transformed by E2a-Pbx1. Potentially, EB-1 overexpression could interfere with normal signaling controlling proliferation or differentiation.

Adenomatous Polyposis Coli Protein↗
PubMed1999

A pathway for conformational diversity in proteins mediated by intramolecular chaperones.

Conformational diversity within unique amino acid sequences is observed in diseases like scrapie and Alzheimer's disease. The molecular basis of such diversity is unknown. Similar phenomena occur in subtilisin, a serine protease homologous with eukaryotic pro-hormone convertases. The subtilisin propeptide functions as an intramolecular chaperone (IMC) that imparts steric information during folding but is not required for enzymatic activity. Point mutations within IMCs alter folding, resulting in structural conformers that specifically interact with their cognate IMCs in a process termed "protein memory." Here, we show a mechanism that mediates conformational diversity in subtilisin. During maturation, while the IMC is autocleaved and subsequently degraded by the active site of subtilisin, enzymatic properties of this site differ significantly before and after cleavage. Although subtilisin folded by Ile-48 --> Thr IMC (IMCI-48T) acquires an "altered" enzymatically active conformation (SubI-48T) significantly different from wild-type subtilisin (SubWT), both precursors undergo autocleavage at similar rates. IMC cleavage initiates conformational changes during which the IMC continues its chaperoning function subsequent to its cleavage from subtilisin. Structural imprinting resulting in conformational diversity originates during this reorganization stage and is a late folding event catalyzed by autocleavage of the IMC.

Amino Acid Sequence↗
PubMed1999

Abuse of guaifenesin-containing medications generates an excess of a carboxylate salt of beta-(2-methoxyphenoxy)-lactic acid, a guaifenesin metabolite, and results in urolithiasis.

OBJECTIVES: Several urinary calculi were submitted to our institution for compositional analysis. The typical techniques of analysis, polarized light microscopy, electron microprobe analysis, and infrared spectroscopy proved inadequate for a definitive identification. As a result, a more detailed organic analysis was conducted to determine the exact chemical structure of the material. METHODS: Infrared spectroscopy and mass spectrometric analysis were carried out on the solid material, providing information concerning the functional groups and the molecular mass of the organic constituent and its components. The stone was solubilized in deuterated solvents and analyzed by nuclear magnetic resonance spectroscopy, which resulted in a definitive chemical structure. RESULTS: The spectroscopic analysis indicated that the stones were composed of a calcium salt of beta-(2-methoxyphenoxy)-lactic acid, a metabolite of the pharmaceutical guaifenesin, which is used as an expectorant. CONCLUSIONS: Guaifenesin, an expectorant common in over-the-counter cold and allergy remedies, can cause urolithiasis if taken in excess. Discussions with physicians and their patients confirmed that most patients admitted to taking large doses of guaifenesin-containing medications.

Adolescent↗
PubMed1999

Malayenolides A-D, novel diterpenes from the indonesian sea pen veretillum malayense

Malayenolides A-D (1-4), four new briarane diterpenes, were isolated from the sea pen Veretillum malayense collected in Indonesia. The new diterpenes possess benzoate and senecioate substitutents, both of which are rare among marine natural products. The structures of the new compounds were determined from spectral data. Compounds 1-4 are toxic to brine shrimp.

Journal Article↗