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Biomedical subjects

C Z Wang

Publications and source records attributed to C Z Wang.

At least 55 records · Page 3Linked to original sources
PubMed1992

Phenylpropanoid and iridoid glycosides from Pedicularis lasiophrys.

Two new compounds, pedicularioside E and F, were isolated from whole plants of Pedicularis lasiophrys, along with the four known compounds, verbascoside, cistanoside C, cistanoside D and 8-epiloganin. On the basis of spectral and chemical evidence, pedicularioside E and F were identified to be 1'-O-beta-D-(3-methoxy-4-hydroxy-beta-phenyl)-ethyl-6'-O-feruloyl- alpha-L-(2-acetyl)-rhamnosyl-(1----3')-4'-acetylglucopyranoside and shanzhisin methyl ester cellobioside, respectively.

Carbohydrate Sequence↗
PubMed1992

Morphologic changes in basal cells during repair of tracheal epithelium.

Basal cells are differentiated with respect to junctional adhesion mechanisms and play a role in attachment of columnar epithelium to the basal lamina. Although much is known about nonciliated and ciliated cell differentiation during the repair process after injury, little is known about the basal cell. We studied the morphology of basal cells and quantitated junctional adhesion structures during repair of tracheal epithelium exposed to toxic cotton smoke. Ten adult ewes were given a smoke injury to a portion of the upper cervical trachea and were killed at 4, 6, 8, 10, and 18 days after injury for morphometric studies. At 4 days, there was a stratified reparative epithelium over the basal lamina, which was two to four cells in depth. The basal cells were identified by their hemidesmosome (HD) attachment to the basal lamina. Basal cells were about 69% larger than controls and flattened rather than columnar. The amount of HD attachment was 192% greater than controls. In contrast, volume density of cytokeratin filaments had decreased about 47%. Basal cells had returned to normal numbers and size and a columnar shape by day 18. The amount of desmosome (D) and HD attachment and volume density of cytokeratins had also reached control levels by day 18. These data indicate that morphology of basal cells changes during the initial stages of reparative regeneration but returns to normal by 18 days. Morphologic changes appear to reflect changes in size of the cell associated with cell division rather than differentiation of recently divided basal cells.

Animals↗
PubMed1991

Phenylpropanoid and iridoid glycosides from Pedicularis spicata.

One new phenylpropanoid glycoside, pedicularioside H, and five known glycosides, gardoside methyl ester, shanzhiside methyl ester, 5-deoxypulchelloside I, verbascoside and pedicularioside A, were isolated from whole plants of Pedicularis spicata. On the basis of the spectral data, chemical evidence and comparison with authentic samples, pedicularioside H was determined to be 1'-O-beta-D-(3-methoxy-4-hydroxy-beta-phenyl)-ethyl-4'-O-feruloyl- beta-D- apiosyl(1----3')-alpha-L-rhamnosyl-(1----6')-glucopyranoside .

Carbohydrate Sequence↗
PubMed1991

Comparison of the therapeutic efficacy and side effects of a single dose of levo-praziquantel with mixed isomer praziquantel in 278 cases of schistosomiasis japonica.

A randomized double-blind study comparing the therapeutic efficacy of single dose of levo-praziquantel and mixed isomer praziquantel was carried out on 139 matched pairs of patients with schistosomiasis japonica. A single dose of either levo-praziquantel (20 mg/kg) or praziquantel (40 mg/kg) was given to each patient. Four and six months after treatment, the stool ova negative conversion rates were 94.85% and 96.27% for the levo-praziquantel group, and 97.06% and 94.03% for the praziquantel group, respectively; there was no statistically significant difference between the two treatments (P greater than 0.05). For lightly and moderately infected patients, a single 20 mg/kg dose of levo-praziquantel was as efficacious as 40 mg/kg of praziquantel. Moreover, levo-praziquantel produced fewer side effects than praziquantel. These results suggest that levo-praziquantel is the component of the mixed isomer preparation that is antihelminthic. Levo-praziquantel could be used therapeutically at half the current dose of the mixed isomer drug.

Adolescent↗
PubMed1991

[Activation of neutrophils in allergic asthmatics].

Neutrophil chemotactic activity (NCA) and activity of myeloperoxidase (MPO) of the neutrophils in asthmatic patients during attacks and in remission and normal controls were determined. The results showed that NCA and activity of MPO in asthmatic patients during attacks were significantly higher than those in remission and in the controls. There was no difference of either NCA or the activity of MPO between asthmatic patients in remission and the controls. There was definite correlation between NCA and activity of MPO in asthmatic patients during attacks, but no correlation between the asthmatic patients in remission and the controls. The results suggest that chemotaxis and activation of neutrophils by neutrophil chemotactic factor may play an important role in pathophysiology of asthma.

Adolescent↗
PubMed1991

Comparative efficacy of levo-praziquantel and praziquantel in treatment of schistosomiasis japonica at a single dose.

The result of a randomized double blind comparison of therapeutic efficacy of single doses of levo-praziquantel (L-PZQ) and praziquantel (PZQ) in the treatment of 139 matched pairs of proved cases of schistosomiasis japonica was reported, 268 were chronic early cases and 10 were late cases. The dosage of L-PQZ was 20 mg/kg, and that of PZQ was 40 mg/kg. Four and 6 months after treatment the stool-ova negative conversion rates were 94.8% and 96.3% for the L-PZQ group, and 97.1% and 94.0% for the PZQ group respectively (P greater than 0.05).

Adolescent↗
PubMed1990

The pathophysiology of carbon monoxide poisoning and acute respiratory failure in a sheep model with smoke inhalation injury.

A smoke inhalation model was created in 22 adult male sheep with pine smoke inhalation through an endotracheal tube for 6 min. Arterial blood gases, HbCO, HbO2 and pulmonary compliance (Cdyn) were monitored, and the morphology of the tracheobronchial tree and pulmonary parenchyma were studied by light and electron microscopy. Severe carbon monoxide poisoning with fatal levels of HbCO (greater than 50 percent) was found at the end of smoke inhalation. Acute respiratory distress, progressive hypoxemia, decreased pulmonary compliance and increased P(A-a)O2 and Qs/QT occurred after injury. Tracheobronchial blockade by pseudomembrane cast, pulmonary edema, atelectasis and necrosis of pulmonary epithelia were demonstrated pathologically. The mechanisms of CO poisoning and ARF are discussed.

Acute Disease↗
PubMed1986

Dynamic changes of lung lymph flow and the release of lysosomal enzyme from the lungs after severe steam inhalation injury in goats.

Chronic lung lymph fistulae were produced in six goats according to Winn's and Stothert's methods with our modification to define the pathophysiology of pulmonary oedema after severe steam inhalation injury. Arterial blood gas, lung lymph flow (QLym), lymph/plasma total protein concentration ratio (L/P), and beta-glucuronidase (beta-G) in plasma and lung lymph were monitored for 24 h post-injury. The pathological changes in the lung tissues were also determined at the end of the study. It was found that directly after injury, QLym increased steadily to a peak value at 6 h, followed by declining values at 18 and 24 h. L/P decreased promptly during the 60 min after injury and then also steadily increased to a peak value at 4 h (P less than 0.05). A significant increase in plasma beta-G was only observed at 4 h post-burn. However, lung lymph beta-G activities and lymph beta-G transport increased immediately after injury, reaching a peak at 4 h (5 and 12 times above baseline values, respectively, P less than 0.01). Significant hypoxaemia and hypocapnia occurred at 2 h post-burn and deteriorated progressively throughout the study. There were obvious pulmonary interstitial and alveolar oedema microscopically. This study demonstrates that the increase in transvascular fluid and protein flux after steam inhalation injury is mainly due to increased pulmonary microvascular permeability. Nevertheless, a hydrostatic pressure effect can not be completely excluded, especially in the first hour post-burn. Lysosomal enzyme release is considered to be one of the important factors which damage lung microvascular elements and induce an increase in their permeability.

Animals↗