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Biomedical subjects

R G Ye

Publications and source records attributed to R G Ye.

28 records · Page 2Linked to original sources
PubMed1993

[134 patients with adult primary nephrotic syndrome treated with combined traditional Chinese medicine and Western medicine].

This paper studied the method and effect of adult primary nephrotic syndrome (PNS) with the integrated traditional Chinese and Western medicine (TCM-WM) treatment. 134 patients were divided into WM group (66 cases) and TCM-WM group (68 cases). Both groups were mainly treated with corticosteroid. The latter group was treated with corticosteroid plus Chinese medicinal herbs. The results showed that total effective rate of WM group and TCM-WM group was 56.1% and 85.3% respectively, while the occurrence rate of side effect was 48% and 14.8% respectively. It indicated that corticosteroid plus Chinese medicinal herbs could enhance curative effect and reduce side effect.

Adolescent↗
PubMed1992

[Treatment of IgA nephropathy by integrated traditional and Western medicine].

45 cases of IgA nephropathy were confirmed by renal biopsy and were divided into 2 groups, the integrated traditional and western medicine (TCM-WM) therapeutic group and the western medicine (WM) therapeutic group. The WM group was treated by conventional western medicine (persantin, vitamin B co.), and the TCM-WM group was treated by the same western medicine plus differential symptomatic treatment with decoction of Chinese crude herbs. In this paper, most patients (30 cases) were present as deficiency of Yin of the Liver and Kidney type, and were treated by Qiju Dihuang pill plus Erzhi pill. All types in TCM-WM group were also used herbs of promoting blood circulation and remove blood stasis in almost every case. After 6 months of such treatment, the total effective rate of TCM-WM group and the WM group were 86.4% and 13.0% respectively. There was very significant difference (P less than 0.01) between them. The results showed that the curative effect of the TCM-WM group was much superior than WM alone for the treatment of IgA nephropathy.

Adolescent↗
PubMed1990

[Characterization of proton pump and osmotic water transport in endocytic vesicles from rat kidney proximal tubule].

The characteristics of ATP-driven proton and osmotic water transport were studied in endocytic vesicles isolated from rat kidney proximal tubule labelled in vivo with fluorescein isothiocyanate-dextran (FITC-dextran). ATP-driven proton transport was measured from the time course of endosome pH following addition of external ATP. The rate of endosome acidification and the minimum pH were dependent on the ATP concentration. At an initial endosome pH of 7.4, the final pH values were 7.30, 6.99, 6.68, 6.38 and 6.39 at [ATP] = 0.005, 0.05, 0.5, 5 and 10 mmol/L, respectively. The acidification was inhibited by 97% at 0.5 mmol/L N-ethylmaleimide but was not affected by vanadate and oligomycin. Osmotic water permeability was determined in the same endosomes from the rapid kinetics of FITC-dextran fluorescence following an inward sucrose gradient. The osmotic water permeability coefficient was 0.03 cm/s at 23 degrees C. Water permeability was inhibited by 70% with addition of 0.5 mmol/L mercuric chloride. The inhibition was reversed completely by adding 5 mmol/L mercaptoethanol. These data demonstrate that proximal tubule endosomes contain a proton ATPase and water channel. The endocytic process may be important for regulation of acidification and fluid resorption in the proximal tubule.

Animals↗
PubMed1989

Simultaneous optical measurement of osmotic and diffusional water permeability in cells and liposomes.

A quantitative description of transmembrane water transport requires specification of osmotic (Pf) and diffusional (Pd) water permeability coefficients. Methodology has been developed to measure Pf and Pd simultaneously on the basis of the sensitivity and rapid response of the fluorophore aminonaphthalenetrisulfonic acid (ANTS) to solution H2O/D2O content. Cells loaded with ANTS in an H2O buffer were subjected to an inward osmotic gradient with a D2O buffer in a stopped-flow apparatus. The time courses of cell volume (giving Pf) and H2O/D2O content (giving Pd) were recorded with dual photomultiplier detection of scattered light intensity and ANTS fluorescence, respectively. The method was validated by using sealed red cell ghosts and artificial liposomes reconstituted with the pore-forming agent gramicidin D. At 25 degrees C, red cell ghost Pf was 0.021 cm/s with Pd 0.005 cm/s (H2O/D2O exchange time 7.9 ms). Pf and Pd were inhibited by 90% and 45% upon addition of 0.5 mM HgCl2. The activation energy for Pd increased from 5.1 kcal/mol to 10 kcal/mol with addition of HgCl2 (18-35 degrees C). In 90% phosphatidylcholine (PC)/10% cholesterol liposomes prepared by bath sonication and exclusion chromatography, Pf and Pd were 5.1 X 10(-4) and 6.3 X 10(-4) cm/s, respectively (23 degrees C). Addition of gramicidin D (0.1 micrograms/mg of PC) resulted in a further increment in Pf and Pd of 7 X 10(-4) and 3 X 10(-4) cm/s, respectively. These results validate the new methodology and demonstrate its utility for rapid determination of Pf/Pd in biological membranes and in liposomes reconstituted with water channels.

Cell Membrane Permeability↗
PubMed1989

Functional colocalization of water channels and proton pumps in endosomes from kidney proximal tubule.

The apical membrane of mammalian proximal tubule undergoes rapid membrane cycling by exocytosis and endocytosis. Osmotic water and ATP-driven proton transport were measured in endocytic vesicles from rabbit and rat proximal tubule apical membrane labeled in vivo with the fluid phase marker fluorescein-dextran. Osmotic water permeability (Pf) was determined from the time course of fluorescein-dextran fluorescence after exposure of endosomes to an inward osmotic gradient in a stopped-flow apparatus. Pf was 0.009 (rabbit) and 0.029 cm/s (rat) (23 degrees C) and independent of osmotic gradient size. Pf in rabbit endosomes was inhibited reversibly by HgCl2 (KI = 0.2 mM) and had an activation energy of 6.4 +/- 0.5 kcal/mol (15-35 degrees C). Endosomal proton ATPase activity was measured from the time course of internal pH, measured by fluorescein-dextran fluorescence, after the addition of external ATP. Endosomes contained an ATP-driven proton pump that was sensitive to N-ethylmaleimide and insensitive to vanadate and oligomycin. In response to saturating [ATP] the pump acidified the endosomal compartment at a rate of 0.17 (rat) and 0.029 pH unit/s (rabbit); at an external pH of 7.4, the steady-state pH was 6.4 (rat) and 6.5 (rabbit). To examine whether water channels and the proton ATPase were present in the same endosome, the time course of fluorescein-dextran fluorescence was measured in response to an osmotic gradient in the presence and absence of ATP. ATP did not alter endosome Pf, but decreased the amplitude of the fluorescence signal by 43 +/- 3% (rabbit) and 47 +/- 4% (rat).(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMedDate not supplied

Hyaluronan preserves peritoneal membrane transport properties.

BACKGROUND: We have shown that intraperitoneal (i.p.) addition of hyaluronan (HA) in a single dwell study in rat could increase peritoneal fluid removal by decreasing the peritoneal fluid absorption rate. In this study, we investigated the impact of repeated use of HA on peritoneal membrane transport characteristics. METHODS: Twelve male Sprague-Dawley rats received a once-daily i.p. injection of 25 mL 4.25% glucose dialysis solution without (HP group, n = 6) or with 0.025% HA (HA group, n = 6) for 1 week. Forty-eight hours after the last injection, a 4-hour dwell using 25 mL 4.25% glucose dialysis solution with i.p. volume marker and frequent dialysate and blood samplings was performed in each rat as well as in rats that did not receive any injection (control group, n = 8). RESULTS: Although the i.p. volumes were significantly lower in the HP and HA groups compared to the control group, i.p. volume in the HA group was significantly higher than in the HP group. Net ultrafiltration at 4 hours was 5.6 +/- 1.3 mL, 10.2 +/- 1.8 mL, and 13.2 +/- 0.6 mL for the HP, HA, and control group, respectively. The peritoneal fluid absorption rate decreased by 45% in the HA group compared to the HP group. There was no significant difference in peritoneal fluid absorption rate between the HA and the control group. No difference was found in the direct lymphatic absorption rate between the HP and HA groups [0.010 +/- 0.003 mL/minute in the HP group and 0.011 +/- 0.004 mL/min in the HA group] although they were both higher than that of the control group (0.004 +/- 0.001 mL/min). The solute transport rates were in general significantly higher in the HP group compared to the HA and control groups, and there was no significant difference between the latter two groups, except that protein transport rate was significantly lower in the HA group compared to the control group. CONCLUSIONS: The present study suggests that (1) repeated exposure to hypertonic glucose-based dialysis solution results in increased peritoneal solute transport rates, as well as increased peritoneal fluid absorption rates; and (2) these changes, reflecting a highly permeable peritoneal membrane, were ameliorated by repeated i.p. addition of hyaluronan. The similar changes in the direct lymphatic absorption rate in rats that received daily i.p. injection of dialysis solution suggest that direct peritoneal lymphatic absorption was not influenced by hyaluronan.

Absorption↗