In this study on red blood cell(RBC) deformability by use of bottom attached method, RBC membrane elastic modulus is estimated introducing elliptical model and is compared with that of traditional rectangular model. As a result, RBC membrane elastic modulus using elliptical model is 20.9% greater than that of rectangular model.
Elastic Modulus ; Erythrocyte Deformability ; Erythrocyte Membrane ; physiology ; Erythrocytes ; Humans ; Models, Theoretical

AIMTo examine the effects of different temperature protection on measures on preservation damages in liquid blood and explore the corresponding.

METHODSTake equal half blood samples from 10 healthy blood donors and divided each sample into two groups, put the fresh blood into CP2D-A solution at 0 degrees C and 4 degrees C, respectively and take the samples 21 days and 42 days, later and then measured the contents of membrane phospholipids with shafig-UR-rehman method, CaM with purification PED test, LPO with spectrophotometry.

RESULTSAt the same temperature, when the preservation time was prolonged, peroxidation was increased, the preservation damages were also augmented; the damages were declined when the temperature was lower during the same period, the aging of blood was more evident at 4 degrees C.

CONCLUSIONBlood peroxidation temperature is lower. The author pointed out the questions and prospects of blood preservation.

Adult ; Blood Donors ; Blood Preservation ; methods ; Erythrocyte Deformability ; Erythrocyte Membrane ; Female ; Humans ; Male ; Temperature ; Time Factors

AIM AND METHODSThe purpose of this investigation was to determine the changes of erythrocyte deformability, band-3 protein and actin in the definite volume of erythrocyte membrane after high intensity running training and recovery in rats.

RESULTSLong-term training could significantly improve erythrocyte deformability and the quantity of membrane proteins. Erythrocyte deformability, band-3 protein and actin decreased transitorily at varying degrees after inadaptable high intensity exercise. One and two week training could improve erythrocyte deformability, the quantity of band-3 protein and actin after recovery.

CONCLUSIONAlterations of erythrocyte membrane protein after high intensity training could cause the change in erythrocyte membrane structure and hence influenced erythrocyte deformability. That was maybe one of mechanisms of training effecting erythrocyte deformability.

Actins ; metabolism ; Animals ; Anion Exchange Protein 1, Erythrocyte ; metabolism ; Erythrocyte Deformability ; Erythrocyte Indices ; Erythrocyte Membrane ; chemistry ; metabolism ; Physical Conditioning, Animal ; Rats ; Rats, Sprague-Dawley

No abstract available.
Asphyxia* ; Erythrocyte Count* ; Erythrocytes* ; Humans ; Hyaline Membrane Disease ; Infant, Newborn

In view of the longevity and innate immune escape of red blood cells, this study designed the red blood cell membrane-coated paclitaxel nanosuspension [RBC-(PTX)NS] and investigated its physicochemical properties and antitumor effect in vitro. Paclitaxel nanosuspension [(PTX)NS] was prepared by ultrasonic precipitation and then RBC-(PTX)NS by ultrasonic coating. The formulation of(PTX)NS was optimized with Box-Behnken method and indexes of particle diameter, zeta potential, and stability. The morphology, particle diameter, stability, in vitro dissolution, and antitumor effect of(PTX)NS and RBC-(PTX)NS were characterized. The results showed that the particle diameter and zeta potential were(129.38±0.92) nm and(-22.41±0.48) mV, respectively, for the optimized(PTX)NS, while(142.5±0.68) nm and(-29.85±0.53) mV, respectively, for RBC-(PTX)NS. Under the transmission electron microscope,(PTX)NS was spherical and RBC-(PTX)NS had obvious core-shell structure. RBC-(PTX)NS remained stable for 5 days at 4 ℃. The in vitro dissolution test demonstrated that the cumulative release rate of RBC-(PTX)NS reached 79% within 20 min, which was significantly higher than that(25%) of(PTX)NS(P<0.05). As evidenced by MTT assay, RBC-(PTX)NS highly inhibited the proliferation of HepG2 cells in a dose-dependent manner. The cell membrane-coated nano-preparation preparation method is simple and reproducible. It improves the solubility of PTX and endows RBC-(PTX)NS with higher stability and stronger cytotoxicity. Thus, it is a new method for the delivery of PTX via nanocrystallization.
Erythrocyte Membrane ; Nanoparticles/chemistry* ; Paclitaxel/pharmacology* ; Particle Size ; Suspensions

Dantrolene sodium in vitro inhibited the ATP-dependent efflux of calcium from human Fed cells, the Ca++-ATPase activity of red blood cell membrane fragments (RBCMF) and passive calcium binding to RBCMF. These effects were obtained With concentrations of dantrolene sodium between 2.5 and 20 uM. However the passive influx of Ca++ was measured at 37 degrees C in cells pretreated to abolish Ca++ pumping and was not influenced by dantrolene sodium. From these results, it was concluded that dantrolene sodium inhibits an active Ca++ extrusion across the red cell membrane by inhibiting Ca++-ATPase activity which is intimately involved with the Ca++ transport mechanism in the red cell membrane.
Calcium/metabolism* ; Dantrolene/pharmacology* ; Erythrocyte Membrane/drug effects* ; Erythrocyte Membrane/metabolism ; Human ; Ion Channels/drug effects* ; Ion Channels/metabolism

The aim of this study was to evaluate the influence of phosphorus (P) deficiency on the morphological and functional characteristics of erythrocytes in cows. Forty Holstein-Friesian dairy cows in mid-lactation were randomly divided into two groups of 20 each and were fed either a low-P diet (0.03% P/kg dry matter [DM]) or a control diet (0.36% P/kg DM). Red blood cell (RBC) indices results showed RBC and mean corpuscular hemoglobin decreased while mean corpuscular volume increased significantly (p < 0.05) in P-deficient cows. Erythrocyte morphology showed erythrocyte destruction in P-deficient cows. Erythrocytes' functional characteristics results showed total bilirubin and indirect bilirubin concentrations and aspartate transaminase and alanine transaminase activity levels in the serum of P-deficient cows were significantly higher than those in control diet-fed cows. Activities of superoxide dismutase and glutathione peroxidase in erythrocytes were lower, while the malondialdehyde content was greater, in P-deficient cows than in control diet-fed cows. Na⁺/K⁺-ATPase and Mg²⁺-ATPase activities were lower in P-deficient cows than in control diet-fed cows; however, Ca²⁺-ATPase activity was not significantly different. The phospholipid composition of the erythrocyte membrane changed and membrane fluidity rigidified in P-deficient cows. The results indicate that P deficiency might impair erythrocyte integrity and functional characteristics in cows.
Alanine Transaminase ; Aspartate Aminotransferases ; Bilirubin ; Diet ; Erythrocyte Indices ; Erythrocyte Membrane ; Erythrocytes ; Glutathione Peroxidase ; Malondialdehyde ; Membrane Fluidity ; Phosphorus* ; Superoxide Dismutase

PURPOSE: The aim of this study was to determine whether plasma lecithin:cholesterol acyltransferase (pLCAT) and erythrocyte membrane Na(+)-K(+)-ATPase ase (emNaKATPs) activity have a correlation in breast cancer. This study compared these parameters at time points before and after treatment with radiotherapy. METHODS: The levels of pLCAT and emNaKATPs were assessed in 30 patients with breast carcinoma and 20 control subjects. While emNaKATPs was measured with spectrophotometric method, pLCAT levels was measured using a specific enzyme-linked immunosorbent assay. RESULTS: pLCAT levels, both before and after radiotherapy, were found to be decreased in breast cancer patients than in the controls groups (p<0.001 and p<0.001, respectively). Also, pLCAT levels after radiotherapy were found to be decreased in breast cancer patients than the pLCAT levels before radiotherapy (p<0.001). The emNaKATPs activity were higher in the control group than in the breast cancer patients before/after radiotherapy (RT) (p<0.001 and p<0.001, respectively). At the same time, emNaKATPs activity before RT was higher in the breast cancer patients than emNaKATPs activity after RT (p<0.001). There was a significant correlation between pLCAT and emNaKATPs activity in breast cancer patients receiving radiotherapy (r=0.63, p<0.001), but no correlation between in breast cancer patients before RT and control group (r=0.023, p>0.05). CONCLUSION: The results of the present study demonstrated that decreased pLCAT and emNaKATPs activity levels in breast cancer patients after/before RT than control group. In addition, decreased emNaKATPs activity in breast cancer patients receiving radiotherapy may be due to decreased pLCAT concentrations and RT beam. In our opinion, altered activities of pLCAT and emNaKATPs are linked to the treatment effect of radiotherapy. These data may clarify the development of cell membrane dysfunction and lipid metabolism in breast cancer patients receiving radiotherapy.
Breast ; Breast Neoplasms ; Cell Membrane ; Cholesterol ; Erythrocyte Membrane ; Humans ; Lecithins ; Lipid Metabolism ; Plasma ; Sterol O-Acyltransferase

This paper reports an in vivo study on the biophysics characteristics of reticulocytes. Anemia was induced by injection of phenylhydrazine in rabbits. The measurements, including electrophoresis rate, hematolytic rate, fluorescent polarization and the changing anisotropic value, were performed in vivo for 72 hours in the process of reticulocytes growing into erythrocytes. It was shown that there were obvious changes in the biophysics characteristics of reticulocytes in this course. Therefore, the findings are of significance to basic, theoretical and clinical studies.
Anemia, Hemolytic ; blood ; chemically induced ; Animals ; Biophysical Phenomena ; Biophysics ; Erythrocyte Deformability ; Erythrocyte Membrane ; physiology ; Phenylhydrazines ; Rabbits ; Reticulocytes ; metabolism ; physiology

The membrane viscoelasticity of erythrocyte taken from both normal subjects and patients with cor pulmonale during acute exacerbation was investigated using a micropipette aspiration technique. Experimental results were analysed with vogit viscoelaticity model based on pioneering theory of Chein et al. The results showed that the erythrocyte membrane elastic moduli ((6.970 +/- 1.050) x 10(-3) dyn/cm) and viscous coefficients ((0.936 +/- 0.242) x 10(-4) dyn x s/cm) of the cor pulmonale patients was significantly higher than those of the normal subjects ((5.203 +/- 1.051) X 10(-3) dyn/cm, (0.620 +/- 0.053) x 10(-4) dyn x s/cm). The membrane elastic moduli, viscous coefficients, rigidity of erythrocyte, and viscosity were all increased. It may be the important subcellular mechanism to cause the decrease of erythrocyte deformability and hyperviscosity of blood in these patients.
Blood Viscosity ; Elasticity ; Erythrocyte Deformability ; physiology ; Erythrocyte Membrane ; physiology ; Erythrocytes ; physiology ; Humans ; Models, Biological ; Pulmonary Heart Disease ; blood