Biomedical subjects

Guo-dong Hu

Publications and source records attributed to Guo-dong Hu.

6 recordsLinked to original sources

PubMed2006

Effects of serum of the rats ventilated with high tidal volume on endothelial cell permeability and therapeutic effects of ulinastatin.

BACKGROUND: With the widespread use of ventilators in treating critically ill patients, the morbidity of ventilator-induced lung injury (VILI) is increasing accordingly. VILI is characterized by a considerable increase in microvascular leakiness and activation of inflammatory processes. In this study we investigated the effects of inflammatory mediators in VILI rat serum on endothelial cytoskeleton and monolayer cellular permeability, as well as the therapeutic effect of ulinastatin, to explore the pathogenesis and the relationship between biotrauma and lung oedema induced by VILI. METHODS: Thirty healthy male Sprague-Dawley rats were randomly divided into three groups: group A (normal tidal volume ventilation), group B (high tidal volume ventilation) and group C (high tidal volume ventilation plus ulinastatin). The serum of each rat after ventilation was added to endothelial cell line ECV-304 medium for two hours to observe the effects of serum and/or ulinastatin on endothelial fibrous actin and permeability. RESULTS: Compared to rats ventilated with normal tidal volume, serum of rats ventilated with high tidal volume caused a striking reorganization of actin cytoskeleton with a weakening of fluorescent intensity at the peripheral filament bands and formation of the long and thick stress fibres in the centre resulting in endothelial contraction and higher permeability. Prior treatment with ulinastatin lessened the above changes significantly. The changes of permeability coefficient of endothelial permeability after group A, B or C rats serum stimulation were (6.95 +/- 1.66)%, (27.50 +/- 7.77)% and (17.71 +/- 4.66)% respectively with statistically significant differences (P < 0.05) among the three groups. CONCLUSIONS: The proinflammatory mediators in the serum of the rats given high tidal volume ventilation increases endothelial permeability by reorganizing actin cytoskeleton, and pretreatment with ulinastatin lessens the permeability by inhibiting of proinflammatory mediators.

Actins↗

PubMed2006

Preparation and bioactivity of human hair keratin-collagen sponge, a new type of dermal analogue.

OBJECTIVE: To develop a three-dimensional porous film of human hair keratin (HHK)-collagen sponge complex for use as a dermal substitute. METHODS: The three components F, B, and Z derived from healthy human hair were weaved into a meshwork and integrated with purified soluble type I collagen extracted from bovine tendons to prepare a highly porous film with vacuum freeze-drying followed by secondary cross-linking with glutaraldehyde. The film was grafted beneath the dorsal skin in 21 SD rats (experimental group), with simple collagen sponge serving as the negative control. The rats receiving surgical operation but without graft served as the blank control. The graft and its surrounding tissue were harvested on days 3, 7 and at weeks 2, 4, 6, 8, 12 after implantation for evaluation of tissue compatibility, vascularization and degradation. RESULTS: The prepared collagen sponge film was semitransparent and porous. Three to 7 days after grafting, inflammatory reaction was relieved gradually, and several fibroblasts and blood vessels were found adherent to the grafts in the experimental groups. At week 4, the wounds healed in the experimental groups, and the fibroblasts were actively secreting collagen and the film degraded obviously with the appearance of elastic fibers. At weeks 6 and 8, new collagen fibers thickened and assumed regular arrangement, and the collagen sponge films disappeared completely. In the control groups, the changes were less obvious and total HHK degradation occurred till week 12. CONCLUSION: The degradable and absorbable HHK-collagen sponge film has relatively satisfactory tissue compatibility and can accelerate wound healing by stimulating cell proliferation and vascularization, showing the potential as an optimal dermal substitute.

Animals↗

PubMed2006

[Study on the protective effects of ZnSO4 on rat flaps with ischemia reperfusion injury].

OBJECTIVE: To observe the protective role of the ectogenesis zinc in the rat flap with ischemia-reperfusion injury and study the mechanism. METHODS: An abdominal island flap was created in Wistar rats. 48 rats were randomly divided into three groups, 16 per group: the non-ischemia-reperfusion group, the ischemia-reperfusion group and the ischemia-reperfusion (IR) group treated with zinc. The content of malondialdehyde (MDA) and the activity of myeloperoxidase (MPO) were measured. The expression of metallothionein (MT) was observed, and the image analysis was performed. The ultrastructure changes of the skin flap with ischemia-reperfusion injury and the flap viability were observed. RESULTS: Compared with the IR group, at 1 h and 24 h of reperfusion, the level of MDA in the adding-zinc-IR group decreased 11.3% and 33.2% (P < 0.05); the activity of MPO decreased 14.2% and 22.7% (P < 0.05); the content of MT increased 41.5% and 44% ( P < 0.01) respectively. In the ischemia-reperfusion injury flaps, MT was located in the cytoplasm of many kinds of cells. The ultrastructure changes of the skin flap of the adding-zinc-IR group were slighter than those of the IR group. The flap viability in the adding-zinc-IR group increased 27.2% (P < 0.05). CONCLUSIONS: MT could be induced by ectogenesis zinc in the flap of rats. The flap with ischemia-reperfusion injury was protected by MT through protecting the cells in the flap.

Animals↗

PubMed2005

[Effect of different tidal volume ventilation on rat bronchial and alveolar epithelial cell apoptosis].

OBJECTIVE: To investigate the changes in bronchial and alveolar epithelial cell apoptosis after mechanical ventilation with different tidal volumes and explore the mechanism and significance of cell apoptosis in ventilation-induced lung injury. METHODS: Thirty healthy male Sprague-Dawley rats were randomly divided into groups A, B and C to receive tracheotomy under anesthesia for ventilation with different tidal volumes (VT) for 4 h (VT of 10 ml/kg in group A, 20 ml/kg in group B and 40 ml/kg in group C). Lung histopathology was assessed after the ventilation and compared between the 3 groups. The severity of lung injury and bronchial epithelial edema was evaluated, and the extent and location of cell apoptosis in the bronchus and lung tissues were studied by transferase d-UTP end-labeling (TUNEL) assay and immunohistochemistry. RESULTS: After mechanical ventilation for 4 h, lung injury and bronchial epithelial edema increased with the increment of VT. By TUNEL assay, the apoptosis index of both alveolar and bronchial epithelial cells was found to increase with VT. Immunohistochemical study identified enhanced caspase-3 expression in the cytoplasm and nuclei of airway and alveolar epithelial cells and vascular endothelial cells in rats with high VT ventilation, and the enhancement was especially obvious in the bronchial epithelial cells. CONCLUSION: Mechanical ventilation with different VTs causes consistent changes in histopathology, cell apoptosis and caspase-3 expression in rats, which support the presumption that cell apoptosis plays an important role in the pathogenesis of high VT ventilation-induced lung injury.

Animals↗

PubMed2005

[Method for human peripheral blood eosinophil isolation for patch-clamp study].

OBJECTIVE: To establish a rapid and economic method for isolating human peripheral blood eosinophils with high viability for patch-clamp studies and investigate the electrophysiological properties of Ca(2+)-activated K(+) channel of the isolated cells. METHODS: Peripheral blood eosinophils were isolated by modified discontinuous Percoll density gradient centrifugation, and the electric currents in the single Ca(2+)-activated K(+) channels of the cells were recorded using patch-clamp technique with cell-attached configuration. RESULTS: The purity of the eosinophils from healthy donors reached (90.5+/-1.6)%, with a viability rate over 99% and recovery rate of (48.2+/-6.9)%. The isolated cells were morphologically intact, from which Ca(2+)-activated K(+) channel activity could be detected. CONCLUSION: The peripheral blood eosinophils isolated using this rapid, simple and highly efficient method are characterized by high purity and viability without obvious cellular injuries, which are ideal for patch-clamp studies.

Cell Separation↗

PubMed2005

[Transcatheter arterial chemoembolization in the treatment of hepatocellular carcinoma].

OBJECTIVE: To evaluate the effect of transcatheter arterial chemoembolization (TACE) on the result and the prognosis of hepatocellular carcinoma (HCC) at systemic, cellular, genetic and molecular levels. METHODS: Patients with histologically proven HCC were divided into two groups: 81 patients in Group A undergoing TACE before operation and 58 patients in Group B treated with surgical resection alone. The degree of apoptosis was analyzed by transferase -mediated dUTP nick end labeling (TUNEL) stain. The expressions of bcl-2, bax, p53, Ki-67 and PCNA proteins were detected by immunohistochemical method. The changes of these markers, tumor necrosis, encapsulation, volume, metastasis, recurrence and cumulative survival in each group were retrospectively analyzed. RESULTS: The more tumor necrosis, apoptosis, encapsulation and tumor shrinkage observed, and the less recurrence resulted from TACE in group A than in group B. The cumulative 1-, 2-, and 3-year survival rates and median survival time were 84.0%, 67.9%, 40.7%, and 803.3 days in group A patients; they were 72.4%, 55.2%, 24.1%, and 742.5 days in group B patients (P < 0.05). CONCLUSION: Preoperative transcatheter arterial chemoembolization is safe and effective as an auxiliary preparatory means before surgical treatment of hepatocellular carcinoma as it may improve the survival of HCC patients.

Adult↗