IN VIVO CHANGES IN SYSTEMIC PCO2 AND PO2 INFLUENCE THE THROMBOEMBOLIC REACTION FOLLOWING WALL PUNCTURE IN VENULES BUT NOT IN ARTERIOLES

1987 ◽  
Author(s):  
Mirjam G A oude Egbrink ◽  
Geert Jan Tangelder ◽  
Dick W Slaaf ◽  
Robert S Reneman
Keyword(s):  
Thrombus Formation ◽  
Fluid Dynamic ◽  
Blood Platelets ◽  
Control Group ◽  
Blood Gas ◽  
Systemic Blood ◽  
Normal Ranges ◽  
Experimental Group

Changes in pH and PCO2 influence the aggregation of blood platelets in response to various agents in vitro. In the present study intravital video-microscopy was used to investigate whether changes in systemic blood gas values influence the thromboembolic reaction in vivo as induced by vessel wall injury.The microtrauma was induced by puncturing the walls of microvessels in the rabbit mesentery (diameter range: 20-40 μm) with glass micropipets (tip diameters: 6-8 μm). The thromboembolic reactions were compared in two groups of anesthetized rabbits. The control group was ventilated to keep the blood gas values within normal ranges (means: pH=7.40, pCO2=32.9 mmHg, pO2=104.7 mmHg). The experimental group breathed spontaneously (mean blood gas values: pH=7.34, pCO2=50.5 mmHg, pO2=48.1 mmHg). The pCO2 and pO2 values were significantly different between both groups.In arterioles and venules of both groups bleeding and thrombus formation started immediately following wall puncture. Bleeding times were short (medians between 1.0 and 2.6 s). Parts of the thrombi started to embolize between 11.4 and 18.2 s following wall puncture (medians). In the control group embolization continued for 101 s in the arterioles and 17 s in the venules; during these periods 6 and 1 emboli were produced, respectively (all median values). In the experimental group the duration of embolization in the arterioles was 143 s in which period 7.5 emboli were produced, values not significantly different from control. In the venules of the experimental group embolization and hence platelet reaction went on uninhibited during the whole observation period of 600 s and 30 emboli were produced. Fluid dynamic factors cannot explain the differences in thromboembolic reaction between the control and experimental venules; vessel diameters and red blood cell velocities were not significantly different between both groups. Therefore, it is likely that the change in thromboembolic reaction in the venules results from the changes in systemic PCO2 and/or pO2. The different reactions in arterioles and venules in response to the altered systemic blood gas values might arise from different reactions in the vessel walls.

scholarly journals 5-Aminolevulinic Acid-Based Photodynamic Therapy Pretreatment Mitigates Ultraviolet A-Induced Oxidative Photodamage

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Hui Hua ◽  
Jiawei Cheng ◽  
Wenbo Bu ◽  
Juan Liu ◽  
Weiwei Ma ◽  
...  
Keyword(s):  
Aminolevulinic Acid ◽  
Epidermal Keratinocytes ◽  
Control Group ◽  
Hacat Cells ◽  
Ultraviolet A ◽  
Hairless Mice ◽  
Human Epidermal Keratinocytes ◽  
Experimental Group

Aim. To determine whether 5-aminolevulinic acid-based photodynamic therapy (ALA-PDT) is effective in combating ultraviolet A- (UVA-) induced oxidative photodamage of hairless mice skin in vivo and human epidermal keratinocytes in vitro. Methods. In in vitro experiments, the human keratinocyte cell line (HaCaT cells) was divided into two groups: the experimental group was treated with ALA-PDT and the control group was left untreated. Then, the experimental group and the control group of cells were exposed to 10 J/m2 of UVA radiation. ROS, O2− species, and MMP were determined by fluorescence microscopy; p53, OGG1, and XPC were determined by Western blot analysis; apoptosis was determined by flow cytometry; and 8-oxo-dG was determined by immunofluorescence. Moreover, HaCaT cells were also treated with ALA-PDT. Then, SOD1 and SOD2 were examined by Western blot analysis. In in vivo experiments, the dorsal skin of hairless mice was treated with ALA-PDT or saline-PDT, and then, they were exposed to 20 J/m2 UVA light. The compound 8-oxo-dG was detected by immunofluorescence. Conclusion. In human epidermal keratinocytes and hairless mice skin, UVA-induced oxidative damage can be prevented effectively with ALA-PDT pretreatment.

scholarly journals Piglets produced by transfer of embryos obtained by in vitro fertilization of oocytes matured in vitro with thymosin: A case report

2020 ◽  
Vol 76 (03) ◽  
pp. 6356-2020 ◽  
Author(s):  
KATARZYNA PONIEDZIAŁEK-KEMPNY ◽  
BARBARA GAJDA ◽  
IWONA RAJSKA ◽  
LECHOSŁAW GAJDA ◽  
ZDZISŁAW SMORĄG
Keyword(s):  
Case Report ◽  
In Vitro Fertilization ◽  
Control Group ◽  
First Birth ◽  
Vitro Fertilization ◽  
Research Material ◽  
Preliminary Study ◽  
Experimental Group

The aim of the study was to examine the in vivo viability of in vitro-produced (IVP) porcine embryos obtained from oocytes matured with thymosin. The research material for this study consisted of immature pig oocytes obtained from ovaries after slaughter and ejaculated semen obtained from one boar. The immature oocytes were cultured in vitro until the metaphase II stage in a medium supplemented with thymosin (TMS). The presumptive zygotes obtained were cultured in vitro for 4-40 hours. The presumptive zygotes and 2-4-cell embryos were evaluated in vivo after transferring them to synchronized recipients. After the transfer of embryos from the experimental group into 2 recipients (50 embryos into each gilt) and the transfer of 50 embryos from the control group into 1 recipient, both gilts that had received embryos obtained by in vitro fertilization of oocytes matured with TMS became pregnant and delivered a total of 16 live piglets. After the transfer of embryos from the control group, no pregnancy was achieved. In conclusion, the results of our preliminary study suggest that the maturation of pig oocytes with thymosin supports the in vivo survival of in vitro produced embryos. It is important to note, that this was the first birth of piglets obtained after transfer of IVP embryos in Poland.

scholarly journals Experimental Application of Sage in Rabbit Husbandry

2008 ◽  
Vol 77 (4) ◽  
pp. 581-588 ◽  
Author(s):  
R. Szabóová ◽  
A. Lauková ◽  
Ľ. Chrastinová ◽  
M. Simonová ◽  
V. Strompfová ◽  
...  
Keyword(s):  
Inhibitory Effect ◽  
Negative Influence ◽  
Feed Consumption ◽  
Control Group ◽  
Coagulase Negative Staphylococci ◽  
E Coli ◽  
Commercial Feed ◽  
Experimental Group

Salvia spp. belongs to the Labiatae family and is characterized by antimicrobial and antiinflammatory effect. The aim of this study was to test its in vitro and in vivo inhibitory effect against bacteria as well as to find an alternative possibility to use sage in the rabbit ecosystem examining biochemical, zootechnical and inmunological indicators, compared to the commercial feed mixture Xtract. Using the sage extract in in vitro tests, its inhibitory effect was noted. Under in vivo conditions, in the experimental group with sage (EG1), reduction of Pseudomonas-like sp. (p < 0.01) and E. coli (p < 0.01) was noted after 7 days of sage application compared to the control group CG2 (with Robenidin) as well as after 21 days of sage extract application, when the reduction of coagulase-negative staphylococci (p < 0.01) was detected (in comparison with the experimental group-EG2, Xtract group). In the caecum of rabbits from EG1, higher values of lactic, acetic and butyric acids were noted. The values of propionic acid were not influenced. Biochemical indicators were not influenced; however, the values of GSH Px were lower in EG1 compared to EG2. Higher phagocytic activity (18%) was noted in EG1 than in EG2 (13%) after 21 days of additives application. The reduction of Eimeria sp. oocysts was demonstrated in EG1 (sage group) after 7 days of sage application comparing to CG2 (217 OPG to 566 OPG). The animals in both experimental groups achieved higher feed consumption and weight gain, lower mortality compared to both controls. Neither of the additives had a negative influence on the health status and growth performance of rabbits.

scholarly journals Evaluation of silver nanoparticles for the prevention of SARS-CoV-2 infection in health workers: in vitro and in vivo

2021 ◽  
Author(s):  
Horacio Almanza-Reyes ◽  
Sandra Moreno ◽  
Ismael Plascencia-Lopez ◽  
Martha Alvarado-Vera ◽  
Leslie Patron-Romero ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
High Risk ◽  
Cultured Cells ◽  
Health Workers ◽  
Randomized Study ◽  
Healthcare Personnel ◽  
Control Group ◽  
Experimental Group

SARS-CoV-2 infection in hospital areas is of a particular concern, since the close interaction between health care personnel and patients diagnosed with COVID-19, which allows virus to be easily spread between them and subsequently to their families and communities. Preventing SARS-CoV-2 infection among healthcare personnel is essential to reduce the frequency of infections and outbreaks during the pandemic considering that they work in high-risk areas. In this research, silver nanoparticles (AgNPs) were tested in vitro and shown to have an inhibitory effect on SARS-CoV-2 infection in cultured cells. Subsequently, we assess the effects of mouthwash and nose rinse with ARGOVIT silver nanoparticles (AgNPs), in the prevention of SARS-CoV-2 contagion in health workers consider as high-risk group of acquiring the infection in the General Tijuana Hospital, Mexico, a hospital for the exclusive recruitment of patients diagnosed with COVID-19. We present a prospective randomized study of 231 participants that was carried out for 9 weeks (during the declaration of a pandemic). The "experimental" group was instructed to do mouthwash and nose rinse with the AgNPs solution; the "control" group was instructed to do mouthwashes and nose rinse in a conventional way. The incidence of SARS-CoV-2 infection was significantly lower in the "experimental" group (two participants of 114, 1.8%) compared to the "control" group (thirty-three participants of 117, 28.2%), with a 84.8% efficiency. We conclude that the mouth and nasal rinse with AgNPs helps in the prevention of SARS-CoV-2 infection in health personnel who are exposed to patients diagnosed with COVID-19.

scholarly journals Evaluation of silver nanoparticles for the prevention of SARS-CoV-2 infection in health workers: In vitro and in vivo

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256401
Author(s):  
Horacio Almanza-Reyes ◽  
Sandra Moreno ◽  
Ismael Plascencia-López ◽  
Martha Alvarado-Vera ◽  
Leslie Patrón-Romero ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
High Risk ◽  
Cultured Cells ◽  
Health Workers ◽  
Randomized Study ◽  
Healthcare Personnel ◽  
Control Group ◽  
Experimental Group

SARS-CoV-2 infection in hospital areas is of a particular concern, since the close interaction between health care personnel and patients diagnosed with COVID-19, which allows virus to be easily spread between them and subsequently to their families and communities. Preventing SARS-CoV-2 infection among healthcare personnel is essential to reduce the frequency of infections and outbreaks during the pandemic considering that they work in high-risk areas. In this research, silver nanoparticles (AgNPs) were tested in vitro and shown to have an inhibitory effect on SARS-CoV-2 infection in cultured cells. Subsequently, we assess the effects of mouthwash and nose rinse with ARGOVIT® silver nanoparticles (AgNPs), in the prevention of SARS-CoV-2 contagion in health workers consider as high-risk group of acquiring the infection in the General Tijuana Hospital, Mexico, a hospital for the exclusive recruitment of patients diagnosed with COVID-19. We present a prospective randomized study of 231 participants that was carried out for 9 weeks (during the declaration of a pandemic). The "experimental" group was instructed to do mouthwash and nose rinse with the AgNPs solution; the "control" group was instructed to do mouthwashes and nose rinse in a conventional way. The incidence of SARS-CoV-2 infection was significantly lower in the "experimental" group (two participants of 114, 1.8%) compared to the "control" group (thirty-three participants of 117, 28.2%), with an 84.8% efficiency. We conclude that the mouth and nasal rinse with AgNPs helps in the prevention of SARS-CoV-2 infection in health personnel who are exposed to patients diagnosed with COVID-19.

Cisplatin Nano-Liposomes Promoting Apoptosis of Retinoblastoma Cells Both In Vivo and In Vitro

2020 ◽  
Vol 12 (4) ◽  
pp. 536-542
Author(s):  
Lijuan Zhao ◽  
Fei Wang ◽  
Wei Fan
Keyword(s):  
Protein Expression ◽  
Nude Mice ◽  
Caspase 3 ◽  
Mrna Level ◽  
Control Group ◽  
Mrna Levels ◽  
Bax Protein ◽  
Experimental Group

This study was established to investigate the effects of cisplatin nano-liposomes on the apoptosis of the human retinoblastoma (RB) cell line Y79 in vitro and in vivo. Y79 cells were cultured and then exposed to Annexin V/PI to test their apoptosis, tested with the Caspase-3 activity detection kit to examine the change in activity of Caspase-3, and subjected to western blotting to test Bcl-2 and Bax protein expression. Y79-cell-transplanted tumor model in nude mice was also established and divided into three groups, with five nude mice in each. Cisplatin nano-liposomes were applied to the experimental group, cisplatin was injected into the control group, while saline was administered to the blank group, after which the nude mice were killed and the tumor was removed. Tumor volumes and weights in the three groups were compared. Nucleic acid extraction from magnetic beads was adopted to extract DNA, RT-PCR was employed to test Bcl-2 and Bax mRNA levels in tumor tissues, and in situ cell death assay kit was applied to test apoptotic cells. In comparison to the cisplatin solution and DMSO groups, the cisplatin liposome group showed higher Y79 apoptotic rate, Caspase-3 activity, and Bax protein expression, and lower Bcl-2 protein expression (all P < 0 05). In comparison with the control and blank groups, the experimental group showed lower tumor volume, weight, and Bcl-2 mRNA level of nude mice. In addition, in comparison with the control group, the experimental group showed higher cellular apoptotic rate and Bax mRNA level. In terms of the clinical effects of cisplatin nano-liposomes on a tumor transplant in nude mice with cervical cancer, they were shown to promote tumor apoptosis.

scholarly journals Nanopolymers Delivery of the Bone Morphogenetic Protein-4 Plasmid to Mesenchymal Stem Cells Promotes Articular Cartilage Repair In Vitro and In Vivo

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Junjun Shi ◽  
Xin Zhang ◽  
Yanbin Pi ◽  
Jingxian Zhu ◽  
Chunyan Zhou ◽  
...  
Keyword(s):  
Stem Cells ◽  
Gene Therapy ◽  
Articular Cartilage ◽  
Cartilage Repair ◽  
Viral Vectors ◽  
Control Group ◽  
Articular Cartilage Repair ◽  
Experimental Group

The clinical application of viral vectors for gene therapy is limited for biosafety consideration. In this study, to promote articular cartilage repair, poly (lactic-co glycolic acid) (PLGA) nanopolymers were used as non-viral vectors to transfect rabbit mesenchymal stem cells (MSCs) with the pDC316-BMP4-EGFP plasmid. The cytotoxicity and transfection efficiency in vitro were acceptable measuring by CCK-8 and flow cytometry. After transfection, Chondrogenic markers (mRNA of Col2a1, Sox9, Bmp4, and Agg) of experimental cells (MSCs being transfected with BMP-4 plasmid by PLGA nanopolymers) were increased more than those of control cells (MSCs being transfected with naked BMP-4 plasmid alone). In vivo study, twelve rabbits (24 knees) with large full thickness articular cartilage defects were randomly divided into the experimental group (MSCs being transfected with BMP-4 plasmid by PLGA nanopolymers) and the control group (MSCs being transfected with naked BMP-4 plasmid). The experimental group showed better regeneration than the control group 6 and 12 weeks postoperatively. Hyaline-like cartilage formed at week 12 in the experimental group, indicating the local delivery of BMP-4 plasmid to MSCs by PLGA nanopolymers improved articular cartilage repair significantly. PLGA nanopolymers could be a promising and effective non-viral vector for gene therapy in cartilage repair.

The Effect of Soluble P-Selectin in Coagulation

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 4106-4106
Author(s):  
Ingrid Korakas ◽  
Darlene Guillen ◽  
Erika Martin ◽  
Mikael Tranholm ◽  
Thomas Barnett ◽  
...  
Keyword(s):  
Whole Blood ◽  
Thrombus Formation ◽  
Membrane Surface ◽  
Control Group ◽  
Human Igg ◽  
Human Whole Blood ◽  
Significant Difference ◽  
Selectin Family

Abstract P-selectin, a member of the selectin family, is a vascular cell adhesion molecule. It is expressed and stored in alpha granules of platelets and in Weibel-Palade bodies of endothelial cells, and upon activation, P-selectin is translocated/transferred to the membrane surface. A key function of the P-selectin is to mediate leukocyte, lymphocyte and platelet interactions in inflammation and possibly in the thrombus formation. A soluble variant, S-Psel, comprising the extracellular domain of P-selectin, has been identified in healthy individuals, but is markedly elevated in patient with vascular disorders. Recent work on S-Psel suggested that S-Psel may play a role in hemostasis/coagulation through the generation of procoagulant TF-bearing microparticles (MP), and therefore, has potential in treating patients with the bleeding disorders, like hemophilia. The aim of this study is to verify studies reporting that S-Psel exhibits in vitro and in vivo pro-coagulant activity. S-Psel and S-Psel-Fc (IgG) fusion were purchased commercially or prepared at Novo Nordisk Research US (NNRUS) and their biological activity was verified by P-selectin/Pselectin glycoprotein ligand-1(PSGL-1) interaction in vitro. The clotting times of human whole blood and plasma treated with S-Psel or S-Psel-Fc, or with an irrelevant human IgG control protein, were measured by thromboelastography and aggregometry respectively. After up to 8 hours of incubation with S-Psel and S-Psel-Fc at a concentration of 15ug/ml, we found no significant difference between samples treated with S-Psel, S-Psel-Fc and the IgG controls. The ability of S-Psel to generate TF-bearing microparticles in human whole blood was examined in a FXa substrate cleavage assay; however, no significant difference in cleavage was observed. Finally, we evaluated S-Psel in vivo. Hemophilia A mice were injected with recombinant mouse S-Psel-IgG or S-Psel-Fc (IgG) at the concentration of 1.2 mg/Kg body weight and human IgG was used as control. As suggested from published results, the effect of S-Psel was determined 6 h after the treatment. Contrary to previous reports, the results revealed no significant difference in bleed time and blood loss between the experimental and control group. In conclusion, we were unable to demonstrate the procoagulant activity of S-Psel in our laboratory either in vitro or in vivo.

Effect of Suloctidil on PgI2 Production and Inhibition of Platelet Aggregation

1979 ◽  
Author(s):  
J. Lansen ◽  
G. Biagi ◽  
P. Niebes ◽  
J. Gordon ◽  
R. Roncucci
Keyword(s):  
Platelet Aggregation ◽  
Vascular Tissue ◽  
Thrombus Formation ◽  
Blood Platelets ◽  
Vena Cava ◽  
Inhibitory Effect ◽  
Sprague Dawley ◽  
Sprague Dawley Rats

Recent findings have suggested that the in vivo balance between the biosynthesis of proaggregating substances by blood platelets (e.g. thromboxane A2, endoperoxides) and antiaggregating substances produced by the vessel wall (PGI2) might be critical for thrombus formation. We therefore investigated the effect of suloctidil (S), indomethacin (I), acetylsalicylic acid (ASA) and tranylcypromine (T) on these parameters. Male Sprague-Dawley rats (200-300 g) fasted for 12 h were given a single i.v. dose (0.5 and 1 mg/kg) of S (glucuronate salt) or 200 mg/kg of the other compounds. Ten min after the injection, rats were killed and segments of the abdominal aorta and inferior vena cava were excised. PGI2 production by these segments vascular tissue was assessed by platelet aggregation inhibitory activity. PGI2 production was almost completely inhibited by ASA, I and T whereas S enhanced the production (or possibly the effect) of PGI2-like activity. The effect of S was dose dependent and was statistically significant at 1 mg/kg. In vitro studies showed that 100 μM S potentiated the inhibitory effect of synthetic PGI2 on platelet aggregation.

scholarly journals Antiradical and Cytoprotective Properties of Allium nutans L. Honey Against CCL4-Induced Liver Damage in Rats

2021 ◽  
Vol 12 ◽  
Author(s):  
Shynggys Sergazy ◽  
Alexander Gulyayev ◽  
Aidana Amangeldiyeva ◽  
Ayaulym Nurgozhina ◽  
Madiyar Nurgaziyev ◽  
...  
Keyword(s):  
Positive Control ◽  
Negative Control ◽  
Control Group ◽  
Cytoprotective Activity ◽  
Antiradical Properties ◽  
Single Intraperitoneal Injection ◽  
Experimental Group ◽  
Cytotoxic Substance

The aim of this study is determine the in vitro and in vivo antiradical properties and the cytoprotective activity of Allium nutans L. honey extract. The antiradical properties of the extracts were investigated in rabbit alveolar macrophages and human foreskin fibroblast (hFFs) cells in the presence of doxorubicin, a cytotoxic substance using DPPH and ABTS assays. The cytoprotective activities were determined using 18 Wistar rats divided into three different groups, a negative control, and two other groups with experimentally induced hepatotoxicity by a single intraperitoneal injection of 50% carbon tetrachloride (CCl4) oil solution. A positive control group, received drinking water only and an experimental group that was treated with Allium nutans L. honey extracts for 7 days. In vitro treatment with Allium nutans L. honey extracts resulted in 78% reduction in radical activity in DPPH and 91.6% inhibition using the ABTS. Also, honey extracts were able to preserve 100% of cell viability in the presence of the cytotoxic, doxorubicin. Furthermore, the treatment with honey extracts resulted in a significant reduction in damage to the structure of liver tissue, as well significant reduction in the levels of ALT and AST in the experimental group compared to the control group.

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