Effect of Selected Antiarrhythmic Drugs on the Superoxide Anion Production by Polymorphonuclear Neutrophils in vitro

Cardiology ◽  
1989 ◽  
Vol 76 (4) ◽  
pp. 264-269 ◽  
Author(s):  
Ewa Wysocka ◽  
Henryk Wysocki ◽  
Tomasz Siminiak ◽  
Adam Szczepanik
Keyword(s):  
Superoxide Anion ◽  
Antiarrhythmic Drugs ◽  
Polymorphonuclear Neutrophils ◽  
Superoxide Anion Production ◽  
Anion Production

scholarly journals Opsonization of Actinobacillus actinomycetemcomitans by Immunoglobulin G Antibody Reactive with Phosphorylcholine

2002 ◽  
Vol 70 (11) ◽  
pp. 6485-6488 ◽  
Author(s):  
Donald Purkall ◽  
John G. Tew ◽  
Harvey A. Schenkein
Keyword(s):  
Streptococcus Pneumoniae ◽  
Immunoglobulin G ◽  
Oxidative Burst ◽  
Superoxide Anion ◽  
Polymorphonuclear Neutrophils ◽  
Actinobacillus Actinomycetemcomitans ◽  
Superoxide Anion Production ◽  
Protective Antibody ◽  
Anion Production ◽  
Human Sera

ABSTRACT We used two strains of Actinobacillus actinomycetemcomitans, one bearing phosphorylcholine (PC) (strain D045D-40) and one devoid of PC antigens (strain DB03A-42), as well as a nonencapsulated strain of Streptococcus pneumoniae (strain 39937), to examine the opsonic properties of physiological concentrations (⩽30 μg/ml) of purified human anti-PC immunoglobulin G (IgG). Anti-PC bound to both A. actinomycetemcomitans DO45D-40 and S. pneumoniae 39937 and induced superoxide anion production by polymorphonuclear neutrophils; induction of the oxidative burst was inhibited by antibodies to either CD16 or CD32. Thus, anti-PC IgG at concentrations present in most human sera promotes the opsonization of PC-expressing strains of A. actinomycetemcomitans in the absence of complement, implying that anti-PC may be a protective antibody against such strains of bacteria.

Exposure of surfactant protein A to ozone in vitro and in vivo impairs its interactions with alveolar cells

1992 ◽  
Vol 262 (1) ◽  
pp. L63-L68 ◽  
Author(s):  
R. S. Oosting ◽  
J. F. Van Iwaarden ◽  
L. Van Bree ◽  
J. Verhoef ◽  
L. M. Van Golde ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Protein A ◽  
Surfactant Protein ◽  
Surfactant Protein A ◽  
Alveolar Type ◽  
Type Ii ◽  
Superoxide Anion Production ◽  
Anion Production

This study focused on the question of whether exposure of surfactant protein A (SP-A) to ozone affected properties of this protein that may be involved in regulating alveolar type II cell and alveolar macrophage functions. In vitro exposure of human or canine SP-A to ozone reduced the ability of this protein to inhibit phorbol-ester induced secretion of [3H]phosphatidylcholine by alveolar type II cells in culture. Ozone-exposed human SP-A showed a decreased ability to enhance phagocytosis of herpes simplex virus and to stimulate superoxide anion production by alveolar macrophages. Experiments with elastase showed that ozone-exposed canine SP-A was more susceptible to proteolysis. A conformational change of the protein could underlie this phenomenon. Surfactant isolated from ozone-exposed rats (0.4 ppm ozone for 12 h) was also less able to stimulate superoxide anion production by alveolar macrophages than surfactant from control rats, which suggested that SP-A in vivo was also susceptible to ozone. The results of this study suggest that SP-A-alveolar cell interactions can be inhibited by ozone exposure, which may contribute to the toxicity of ozone in the lungs.

Effect of Peritoneal Dialysis Effluent on Superoxide Anion Production by Polymorphonuclear Neutrophils

Nephron ◽  
1993 ◽  
Vol 64 (3) ◽  
pp. 382-387 ◽  
Author(s):  
I. Daniels ◽  
M. Lindsay ◽  
C. Porter ◽  
A.P. Haynes ◽  
J. Fletcher ◽  
...  
Keyword(s):  
Peritoneal Dialysis ◽  
Superoxide Anion ◽  
Polymorphonuclear Neutrophils ◽  
Superoxide Anion Production ◽  
Anion Production ◽  
Peritoneal Dialysis Effluent

scholarly journals Mitochondria Superoxide Anion Production Contributes to Geranylgeraniol-Induced Death inLeishmania amazonensis

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Milene Valéria Lopes ◽  
Vânia Cristina Desoti ◽  
Angelo de Oliveira Caleare ◽  
Tânia Ueda-Nakamura ◽  
Sueli Oliveira Silva ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Chromatin Condensation ◽  
Ultrastructural Changes ◽  
Resonance Imaging ◽  
Superoxide Anion Production ◽  
Human Blood Cells ◽  
Anion Production ◽  
Bioactive Constituent ◽  
Intracellular Amastigote

Here we demonstrate the activity of geranylgeraniol, the major bioactive constituent from seeds ofBixa orellana, againstLeishmania amazonensis. Geranylgeraniol was identified through1H and13C nuclear magnetic resonance imaging and DEPT. The compound inhibited the promastigote and intracellular amastigote forms, with IC50of11±1.0and17.5±0.7 μg/mL, respectively. This compound was also more toxic to parasites than to macrophages and did not cause lysis in human blood cells. Morphological and ultrastructural changes induced by geranylgeraniol were observed in the protozoan by electronic microscopy and included mainly mitochondria alterations and an abnormal chromatin condensation in the nucleus. These alterations were confirmed by Rh 123 and TUNEL assays. Additionally, geranylgeraniol induces an increase in superoxide anion production. Collectively, ourin vitrostudies indicate geranylgeraniol as a selective antileishmanial that appears to be mediated by apoptosis-like cell death.

scholarly journals In vitro characterisation of fresh and frozen sex-sorted bull spermatozoa

2017 ◽  
Vol 29 (7) ◽  
pp. 1415 ◽  
Author(s):  
Shauna A. Holden ◽  
Craig Murphy ◽  
Juan F. Moreno ◽  
Stephen T. Butler ◽  
Andrew R. Cromie ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Superoxide Anion ◽  
Superoxide Anion Production ◽  
Holstein Friesian ◽  
Anion Production ◽  
And Oxidative Stress

This study sought to compare the in vitro characteristics of fresh and frozen non-sorted (NS) and sex-sorted (SS) bull spermatozoa. Experiment 1: Holstein–Friesian ejaculates (n = 10 bulls) were split across four treatments and processed: (1) NS fresh at 3 × 106 spermatozoa, (2) X-SS frozen at 2 × 106 spermatozoa, (3) X-SS fresh at 2 × 106 spermatozoa and (4) X-SS fresh at 1 × 106 spermatozoa. NS frozen controls of 20 × 106 spermatozoa per straw were sourced from previously frozen ejaculates (n = 3 bulls). Experiment 2: Aberdeen Angus ejaculates (n = 4 bulls) were split across four treatments and processed as: (1) NS fresh 3 × 106 spermatozoa, (2) Y-SS fresh at 1 × 106 spermatozoa, (3) Y-SS fresh at 2 × 106 spermatozoa and (4) X-SS fresh at 2 × 106 spermatozoa. Controls were sourced as per Experiment 1. In vitro assessments for progressive linear motility, acrosomal status and oxidative stress were carried out on Days 1, 2 and 3 after sorting (Day 0 = day of sorting. In both experiments SS fresh treatments had higher levels of agglutination in comparison to the NS fresh (P < 0.001), NS frozen treatments had the greatest PLM (P < 0.05) and NS spermatozoa exhibited higher levels of superoxide anion production compared with SS spermatozoa (P < 0.05). Experiment 1 found both fresh and frozen SS treatments had higher levels of viable acrosome-intact spermatozoa compared with the NS frozen treatments (P < 0.01).

scholarly journals First Evidence of In Vitro Effects of C6O4—A Substitute of PFOA—On Haemocytes of the Clam Ruditapes philippinarum

Toxics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 191
Author(s):  
Jacopo Fabrello ◽  
Francesca Targhetta ◽  
Maria Ciscato ◽  
Davide Asnicar ◽  
Ilaria Bernardini ◽  
...  
Keyword(s):  
Chromosomal Aberrations ◽  
Superoxide Anion ◽  
Ruditapes Philippinarum ◽  
Membrane Stability ◽  
Lysosomal Membrane ◽  
Superoxide Anion Production ◽  
Anion Production ◽  
Lysosomal Membrane Stability ◽  
In Vitro Effects

Alternative chemicals to per- and poly-fluoroalkyl substances have recently been introduced in various industrial processes. C6O4 (difluoro{[2,2,4,5-tetrafluoro-5-(trifluoromethoxy)-1,3-dioxolan-4-yl]oxy}acetic acid) is a new surfactant and emulsifier used as a replacement for perfluorooctanoic acid (PFOA). From an ecotoxicological point of view, in vitro assays are useful tools for assessing the negative effects and understanding the mechanisms of action of chemicals at the cellular level. Here, we present the results of an in vitro study in which the effects of C6O4 were evaluated—for the first time—on haemocytes of the clam Ruditapes philippinarum. Cells were exposed to three concentrations of C6O4 (0.05, 0.5, 5 μg/mL) and the effects on haemocyte viability, haemocyte morphology, differential haemocyte count, lysosomal membrane stability, superoxide anion production, acid phosphatase, and β-glucuronidase activities, as well as on the percentage of micronuclei and chromosomal aberrations were evaluated. The results demonstrated that C6O4 significantly affected haemocyte morphology, lysosomal membrane stability, hydrolytic enzyme activity, and superoxide anion production, and promoted chromosomal aberrations. To the best of our knowledge, this is the first study revealing the in vitro effects of C6O4, a substitute for PFOA, on haemocytes from a bivalve species.

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