In vivo culture of blood cells

1969 ◽  
Vol 72 (3) ◽  
pp. 476-486 ◽  
Author(s):  
P. Rasmussen ◽  
O. Hjortdal
Keyword(s):  
Blood Cells ◽  
In Vivo Culture

In vivo culture of blood cells

1969 ◽  
Vol 72 (2) ◽  
pp. 304-319 ◽  
Author(s):  
Olav Hjortdal ◽  
P. Rasmussen
Keyword(s):  
Blood Cells ◽  
In Vivo Culture

Ultrastructural observations on the in vitro cytoadherence of Plasmodium falciparum infected red blood cells

1990 ◽  
Vol 48 (3) ◽  
pp. 914-915
Author(s):  
D.J.P. Ferguson ◽  
A.R. Berendt ◽  
J. Tansey ◽  
K. Marsh ◽  
C.I. Newbold
Keyword(s):  
Plasmodium Falciparum ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Umbilical Vein ◽  
Cell Types ◽  
Amelanotic Melanoma ◽  
Cytoplasmic Process ◽  
Umbilical Vein Endothelial Cells

In human malaria, the most serious clinical manifestation is cerebral malaria (CM) due to infection with Plasmodium falciparum. The pathology of CM is thought to relate to the fact that red blood cells containing mature forms of the parasite (PRBC) cytoadhere or sequester to post capillary venules of various tissues including the brain. This in vivo phenomenon has been studied in vitro by examining the cytoadherence of PRBCs to various cell types and purified proteins. To date, three Ijiost receptor molecules have been identified; CD36, ICAM-1 and thrombospondin. The specific changes in the PRBC membrane which mediate cytoadherence are less well understood, but they include the sub-membranous deposition of electron-dense material resulting in surface deformations called knobs. Knobs were thought to be essential for cytoadherence, lput recent work has shown that certain knob-negative (K-) lines can cytoadhere. In the present study, we have used electron microscopy to re-examine the interactions between K+ PRBCs and both C32 amelanotic melanoma cells and human umbilical vein endothelial cells (HUVEC).We confirm previous data demonstrating that C32 cells possess numerous microvilli which adhere to the PRBC, mainly via the knobs (Fig. 1). In contrast, the HUVEC were relatively smooth and the PRBCs appeared partially flattened onto the cell surface (Fig. 2). Furthermore, many of the PRBCs exhibited an invagination of the limiting membrane in the attachment zone, often containing a cytoplasmic process from the endothelial cell (Fig. 2).

The Ullrastructure of Platelet Participation in Hemostasis

1965 ◽  
Vol 13 (01) ◽  
pp. 065-083 ◽  
Author(s):  
Shirley A. Johnson ◽  
Ronaldo S. Balboa ◽  
Harlan J. Pederson ◽  
Monica Buckley
Keyword(s):  
Platelet Aggregation ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Guinea Pigs ◽  
Platelet Factor ◽  
Mesenteric Vessels ◽  
Platelet Aggregates ◽  
Electron Lucent

SummaryThe ultrastructure of platelet aggregation in vivo in response to bleeding brought about by transection of small mesenteric vessels in rats and guinea pigs has been studied. Platelets aggregate, degranulate and separating membranes disappear in parallel with fibrin appearance which is first seen at several loci after 30 seconds of bleeding. About 40 per cent of the electron opaque granules, some of which contain platelet factor 3 have disappeared after one minute of bleeding while the electron lucent granules increase by 70 per cent suggesting that some of them may be empty vesicles. Most of the platelet aggregates of the random type disappear leaving clumped red blood cells entrapped by a network of fibrin fibers which emanate from the remains of platelet aggregates of the rosette type to maintain hemostasis.

Cytotoxicity of chitosan ultrafine nanoshuttles on MCF-7 cell line as surrogate model for breast cancer

2020 ◽  
Vol 17 ◽  
Author(s):  
Tarek Faris ◽  
Gamaleldin I. Harisa ◽  
Fars K. Alanazi ◽  
Mohamed M. Badran ◽  
Afraa Mohammad Alotaibi ◽  
...  
Keyword(s):  
Red Blood Cells ◽  
Factorial Design ◽  
Cell Line ◽  
Cell Lines ◽  
Blood Cells ◽  
Sodium Tripolyphosphate ◽  
Physicochemical Characterization ◽  
Spherical Shape ◽  
Mcf 7

Aim: This study aimed to explore an affordable technique for the fabrication of Chitosan Nanoshuttles (CSNS) at the ultrafine nanoscale less than 100 nm with improved physicochemical properties, and cytotoxicity on the MCF-7 cell line. Background: Despite several studies reported that the antitumor effect of CS and CSNS could achieve intracellular compartment target ability, no enough available about this issue and further studies are required to address this assumption. Objectives: The objective of the current study was to investigate the potential processing variables for the production of ultrafine CSNS (> 100 nm) using Box-Benhken Design factorial design (BBD). This was achieved through a study of the effects of processing factors, such as CS concentration, CS/TPP ratio, and pH of the CS solution, on PS, PDI, and ZP. Moreover, the obtained CSNS was evaluated for physicochemical characteristics, morphology Also, hemocompatibility, and cytotoxicity using Red Blood Cells (RBCs) and MCF-7 cell lines were investigated. Methods: Box-Benhken Design factorial design (BBD) was used in the analysis of different selected variables. The effects of CS concentration, sodium tripolyphosphate (TPP) ratio, and pH on particle size, Polydispersity Index (PDI), and Zeta Potential (ZP) were measured. Subsequently, the prepared CS nanoshuttles were exposed to stability studies, physicochemical characterization, hemocompatibility, and cytotoxicity using red blood cells and MCF-7 cell lines as surrogate models for in vivo study. Result: The present results revealed that the optimized CSNS have ultrafine nanosize, (78.3±0.22 nm), homogenous with PDI (0.131±0.11), and ZP (31.9±0.25 mV). Moreover, CSNS have a spherical shape, amorphous in structure, and physically stable. Also, CSNS has biological safety as indicated by a gentle effect on red blood cell hemolysis, besides, the obtained nanoshuttles decrease MCF-7 viability. Conclusion: The present findings concluded that the developed ultrafine CSNS has unique properties with enhanced cytotoxicity. thus promising for use in intracellular organelles drug delivery.

scholarly journals Multimodal Diagnostics of Microrheologic Alterations in Blood of Coronary Heart Disease and Diabetic Patients

Diagnostics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 76
Author(s):  
Anastasia Maslianitsyna ◽  
Petr Ermolinskiy ◽  
Andrei Lugovtsov ◽  
Alexandra Pigurenko ◽  
Maria Sasonko ◽  
...  
Keyword(s):  
Coronary Heart Disease ◽  
Heart Disease ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Optical Methods ◽  
Diabetic Patients ◽  
Aggregation Index ◽  
Significant Difference

Coronary heart disease (CHD) has serious implications for human health and needs to be diagnosed as early as possible. In this article in vivo and in vitro optical methods are used to study blood properties related to the aggregation of red blood cells in patients with CHD and comorbidities such as type 2 diabetes mellitus (T2DM). The results show not only a significant difference of the aggregation in patients compared to healthy people, but also a correspondence between in vivo and in vitro parameters. Red blood cells aggregate in CHD patients faster and more numerously; in particular the aggregation index increases by 20 ± 7%. The presence of T2DM also significantly elevates aggregation in CHD patients. This work demonstrates multimodal diagnostics and monitoring of patients with socially significant pathologies.

scholarly journals A C-peptide complex with albumin and Zn2+ increases measurable GLUT1 levels in membranes of human red blood cells

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Geiger ◽  
T. Janes ◽  
H. Keshavarz ◽  
S. Summers ◽  
C. Pinger ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Amino Acid ◽  
Blood Cells ◽  
Glucose Transporter ◽  
Peptide Binding ◽  
C Peptide ◽  
Amino Acid Peptide ◽  
Human Red Blood Cells

Abstract People with type 1 diabetes (T1D) require exogenous administration of insulin, which stimulates the translocation of the GLUT4 glucose transporter to cell membranes. However, most bloodstream cells contain GLUT1 and are not directly affected by insulin. Here, we report that C-peptide, the 31-amino acid peptide secreted in equal amounts with insulin in vivo, is part of a 3-component complex that affects red blood cell (RBC) membranes. Multiple techniques were used to demonstrate saturable and specific C-peptide binding to RBCs when delivered as part of a complex with albumin. Importantly, when the complex also included Zn2+, a significant increase in cell membrane GLUT1 was measured, thus providing a cellular effect similar to insulin, but on a transporter on which insulin has no effect.

scholarly journals Inhibition of platelet phagocytosis as an in vitro predictor for therapeutic potential of RBC antibodies in murine ITP

Blood ◽  
2020 ◽  
Vol 135 (26) ◽  
pp. 2420-2424 ◽  
Author(s):  
Ramsha Khan ◽  
Melissa Menard ◽  
Chao-Ching Jen ◽  
Xi Chen ◽  
Peter A. A. Norris ◽  
...  
Keyword(s):  
Blood Cells ◽  
Immune Thrombocytopenia ◽  
Therapeutic Potential ◽  
Sufficient Condition ◽  
First Line ◽  
Phagocytosis Assay ◽  
First Line Therapy ◽  
Line Therapy

Abstract Polyclonal anti-D is a first-line therapy for immune thrombocytopenia (ITP). Monoclonal antibodies are desirable alternatives, but none have yet proven successful despite their ability to opsonize erythrocytes (or red blood cells, RBCs) and cause anemia. Here, we examined 12 murine erythrocyte–specific antibodies of different specificity and subtypes and found that 8 of these antibodies could induce anemia in antigen-positive mice. Of these 8 antibodies, only 5 ameliorated ITP. All antibodies were examined for their in vitro ability to support macrophage-mediated phagocytosis of erythrocytes. Antibodies which supported erythrocyte phagocytosis in vitro successfully ameliorated ITP in vivo. To examine the ability of each antibody to inhibit phagocytosis of platelets, the antibodies were used to sensitize erythrocytes in vitro and these were added to a platelet phagocytosis assay. Antibodies that inhibited platelet phagocytosis in vitro also all ameliorated ITP in vivo. We conclude that inducing anemia is not a sufficient condition for amelioration of ITP but that the antibody’s ability to prevent platelet phagocytosis in vitro predicted its ability to ameliorate ITP. We suggest that inhibition of in vitro platelet phagocytosis may prove to be a valuable tool for determining which erythrocyte antibodies would likely be candidates for clinical use in ITP.

scholarly journals Role of Calcium in Phosphatidylserine Externalisation in Red Blood Cells from Sickle Cell Patients

Anemia ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Erwin Weiss ◽  
David Charles Rees ◽  
John Stanley Gibson
Keyword(s):  
Red Blood Cells ◽  
Sickle Cell ◽  
Blood Cells ◽  
Phosphatidylserine Exposure ◽  
Channel Inhibition ◽  
Cation Conductance ◽  
Gardos Channel ◽  
Cation Permeability

Phosphatidylserine exposure occurs in red blood cells (RBCs) from sickle cell disease (SCD) patients and is increased by deoxygenation. The mechanisms responsible remain unclear. RBCs from SCD patients also have elevated cation permeability, and, in particular, a deoxygenation-induced cation conductance which mediates entry, providing an obvious link with phosphatidylserine exposure. The role of was investigated using FITC-labelled annexin. Results confirmed high phosphatidylserine exposure in RBCs from SCD patients increasing upon deoxygenation. When deoxygenated, phosphatidylserine exposure was further elevated as extracellular [] was increased. This effect was inhibited by dipyridamole, intracellular chelation, and Gardos channel inhibition. Phosphatidylserine exposure was reduced in high saline. levels required to elicit phosphatidylserine exposure were in the low micromolar range. Findings are consistent with entry through the deoxygenation-induced pathway (), activating the Gardos channel. [] required for phosphatidylserine scrambling are in the range achievablein vivo.

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