scholarly journals Serum Neuregulin-1β as a Biomarker of Cardiovascular Fitness

2009 ◽  
Vol 2 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Vaibhav Moondra ◽  
Satyam Sarma ◽  
Tracy Buxton ◽  
Radwan Safa ◽  
Gregory Cote ◽  
...  
Keyword(s):  
Physical Activity ◽  
Skeletal Muscle ◽  
Healthy Subjects ◽  
Sandwich Elisa ◽  
Bicycle Ergometer ◽  
Cardiovascular Fitness ◽  
Elisa Assay ◽  
Healthy Men ◽  
Sandwich Elisa Assay ◽  
Cardio Respiratory Fitness

Purpose: Neuregulins (NRG) are growth factors that bind to receptors of the erbB family, and are known to mediate a number of processes involved in diverse tissues. Neuregulin-1β is expressed in skeletal muscle and is activated by exercise. We hypothesized that NRG-1β might circulate in the bloodstream and increase as a consequence of physical activity. A study was conducted in healthy subjects to determine if NRG-1β is immunodetectable in human serum, and if so whether levels relate acutely or chronically to exercise. Methods: Nine healthy men underwent three bouts of exercise of varying degrees of intensity on a bicycle ergometer over a period of three weeks. Cardio-respiratory fitness was determined by measurement of maximal oxygen uptake (VO2max). Serum was sampled prior to and immediately after each session (up to 30 minutes post) and serum NRG-1ß was quantified utilizing an indirect sandwich ELISA assay developed in our lab. Results: Across subjects, mean serum NRG-1β levels ranged from 32 ng/mL to 473 ng/mL. Individual subjects showed relatively stable levels during the study period that did not change acutely after exercise. Serum NRG-1β demonstrated a positive correlation with VO2max (r2=0.49, p =.044). Conclusions: These preliminary observations suggest that at least in healthy men, serum NRG-1β is an indicator of cardio- respiratory fitness and does not change acutely with exercise.

Monoclonal Antibodies to Sea Cucumber Polysaccharide and Their Use in a Sandwich ELISA Assay

Hybridoma ◽  
2011 ◽  
Vol 30 (4) ◽  
pp. 381-385 ◽  
Author(s):  
Junjun Wang ◽  
Hu Zhao ◽  
Ying Zheng ◽  
Wei Liu ◽  
Hua Zhou ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Sea Cucumber ◽  
Sandwich Elisa ◽  
Elisa Assay ◽  
Sandwich Elisa Assay

Sandwich ELISA Assay for the Quantitation of Palytoxin and Its Analogs in Natural Samples

2013 ◽  
Vol 47 (4) ◽  
pp. 2034-2042 ◽  
Author(s):  
S. Boscolo ◽  
M. Pelin ◽  
M. De Bortoli ◽  
G. Fontanive ◽  
A. Barreras ◽  
...  
Keyword(s):  
Sandwich Elisa ◽  
Elisa Assay ◽  
Sandwich Elisa Assay

A Simple, Quick One-step ELISA Assay for the Determination of Complex Plasma Factor XIII (A2B2)

2000 ◽  
Vol 83 (02) ◽  
pp. 268-273 ◽  
Author(s):  
Éva Katona ◽  
Gizella Haramura ◽  
Levente Kárpáti ◽  
József Fachet ◽  
László Muszbek
Keyword(s):  
Factor Xiii ◽  
Sandwich Elisa ◽  
High Sensitivity ◽  
Reference Interval ◽  
Elisa Assay ◽  
Plasma Factor ◽  
Sandwich Elisa Assay ◽  
One Step ◽  
A Subunit

SummaryA new highly sensitive sandwich ELISA assay was developed for the determination of plasma factor XIII (FXIII). Plasma FXIII is a tetrameric complex of two types of subunits (A2B2). A biotinylated monoclonal capture-antibody against the B-subunit and a peroxidase-labelled monoclonal tag-antibody against the A-subunit were added to the plasma dilution and the amount of the complex attached to streptavidincoated microplate was quantitated by measuring peroxidase activity. Only the tetrameric plasma FXIII reacted in the assay, non-complexed A or B subunits showed no reaction. The assay is linear up-to 40 µg/L of FXIII in the assay mixture. It is a quick one-step assay which can be performed within two hours. At normal and low FXIII concentration within batch reproducibility was 2.0% and 3.3%, day to day variation was 5.5% and 8.7%, respectively. Its high sensitivity allows reliable measurement at FXIII concentrations below 1% of normal average. Plasma samples can be stored for the assay at –20° C for at least one month. Plasma levels of healthy individuals were normally distributed and no gender difference was observed. A reference interval of 14-28 mg/L (67-133%) was established.

Development of a sandwich ELISA assay for measuring bovine soluble type II IL-1 receptor (IL1R2) concentration in serum and milk

Cytokine ◽  
2005 ◽  
Vol 32 (3-4) ◽  
pp. 132-136 ◽  
Author(s):  
Katsuro Hagiwara ◽  
Keiko Kitajima ◽  
Hitoki Yamanaka ◽  
Rikio Kirisawa ◽  
Hiroshi Iwai
Keyword(s):  
Sandwich Elisa ◽  
Elisa Assay ◽  
Type Ii ◽  
Sandwich Elisa Assay

Development of a Double Antibody Sandwich Elisa Assay for the Diagnosis of Angiostrongyliasis

2011 ◽  
Vol 97 (4) ◽  
pp. 721-724 ◽  
Author(s):  
Mu-Xin Chen ◽  
Kun Wang ◽  
Lin Ai ◽  
Wen-Hao Yan ◽  
Liang Peng ◽  
...  
Keyword(s):  
Sandwich Elisa ◽  
Elisa Assay ◽  
Double Antibody ◽  
Sandwich Elisa Assay

scholarly journals Quantitative Detection of Pork Contamination in Cooked Meat Products by ELISA

2018 ◽  
Vol 101 (3) ◽  
pp. 810-816 ◽  
Author(s):  
Cortlandt P Thienes ◽  
Jongkit Masiri ◽  
Lora A Benoit ◽  
Brianda Barrios-Lopez ◽  
Santosh A Samuel ◽  
...  
Keyword(s):  
Validation Study ◽  
Sandwich Elisa ◽  
Meat Products ◽  
Quantitative Detection ◽  
Elisa Assay ◽  
Analytical Sensitivity ◽  
Sandwich Elisa Assay ◽  
Analytical Range ◽  
Cooked Meat ◽  
Cooked Meat Products

Abstract Recent news of many cases of adulteration of meats with pork has bolstered the need for a way to detect and quantify the unwanted contamination of pork in other meats. To address this need, Microbiologique, Inc. has produced a sandwich ELISA assay that can rapidly quantify the presence of pork in cooked horse, beef, chicken, goat, and lamb meats. We carried out a validation study and showed that this assay has an analytical sensitivity of 0.00014 and 0.00040% (w/v) for cooked and autoclaved pork, respectively, and an analytical range of quantitation of 0.05–3.2% (w/v) in the absence of other meats. The assay can measure pork contamination down to 0.1% (w/w) in the presence of cooked horse, beef, chicken, goat, and lamb meats. The assay is quick and can be completed in 1 h and 10 min.

Development of a sandwich ELISA assay for quantification of human tissue transglutaminase in cell lysates and tissue homogenates

Amino Acids ◽  
2016 ◽  
Vol 49 (3) ◽  
pp. 597-604 ◽  
Author(s):  
Éva Sivadó ◽  
Sabrina Lareure ◽  
Valérie Attuil-Audenis ◽  
Saïd El Alaoui ◽  
Vincent Thomas
Keyword(s):  
Human Tissue ◽  
Tissue Transglutaminase ◽  
Sandwich Elisa ◽  
Elisa Assay ◽  
Cell Lysates ◽  
Sandwich Elisa Assay ◽  
Tissue Homogenates

scholarly journals Exercise Induces a Marked Increase in Plasma Follistatin: Evidence That Follistatin Is a Contraction-Induced Hepatokine

Endocrinology ◽  
2011 ◽  
Vol 152 (1) ◽  
pp. 164-171 ◽  
Author(s):  
Jakob Hansen ◽  
Claus Brandt ◽  
Anders R. Nielsen ◽  
Pernille Hojman ◽  
Martin Whitham ◽  
...  
Keyword(s):  
Physical Activity ◽  
Skeletal Muscle ◽  
Healthy Subjects ◽  
Muscle Growth ◽  
Knee Extensor ◽  
Bicycle Exercise ◽  
Age Related ◽  
Mrna And Protein Expression ◽  
The One ◽  
Net Release

Abstract Follistatin is a member of the TGF-β super family and inhibits the action of myostatin to regulate skeletal muscle growth. The regulation of follistatin during physical exercise is unclear but may be important because physical activity is a major intervention to prevent age-related sarcopenia. First, healthy subjects performed either bicycle or one-legged knee extensor exercise. Arterial-venous differences were assessed during the one-legged knee extensor experiment. Next, mice performed 1 h of swimming, and the expression of follistatin was examined in various tissues using quantitative PCR. Western blotting assessed follistatin protein content in the liver. IL-6 and epinephrine were investigated as drivers of follistatin secretion. After 3 h of bicycle exercise, plasma follistatin increased 3 h into recovery with a peak of 7-fold. No net release of follistatin could be detected from the exercising limb. In mice performing a bout of swimming exercise, increases in plasma follistatin as well as follistatin mRNA and protein expression in the liver were observed. IL-6 infusion to healthy young men did not affect the follistatin concentration in the circulation. When mice were stimulated with epinephrine, no increase in the hepatic mRNA of follistatin was observed. This is the first study to demonstrate that plasma follistatin is increased during exercise and most likely originates from the liver. These data introduce new perspectives regarding muscle-liver cross talk during exercise and during recovery from exercise.

Sandwich ELISA assay for quantitative measurement of SP-40, 40 in seminal plasma and serum

1990 ◽  
Vol 131 (2) ◽  
pp. 159-163 ◽  
Author(s):  
Nam-Ho Choi ◽  
Takashi Tobe ◽  
Katsutoshi Hara ◽  
Hideki Yoshida ◽  
Motowo Tomita
Keyword(s):  
Seminal Plasma ◽  
Quantitative Measurement ◽  
Sandwich Elisa ◽  
Elisa Assay ◽  
Sandwich Elisa Assay
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