Journal: Arthritis and rheumatism

Article Title: Diminished cartilage-lubricating ability of human osteoarthritic synovial fluid deficient in proteoglycan 4: Restoration through proteoglycan 4 supplementation.

doi: 10.1002/art.34674

Figure Lengend Snippet: Figure 1. Characterization of the proteoglycan 4 (PRG4) enzyme- linked immunosorbent assay control by protein staining (A) and characterization of high molecular weight PRG4 immunoreactivity in PRG4 control, normal (NL) human synovial fluid (hSF), and osteo- arthritic (OA) SF samples by Western blotting using antipeptide antibody LPN (capture) (B) and horseradish peroxidase (HRP)– conjugated peanut agglutinin (PNA) (detection) (C). Samples were subjected to 3–8% sodium dodecyl sulfate–polyacrylamide gel electro- phoresis, followed by protein staining or Western blotting as described in Materials and Methods. PRG4 controls treated with neuraminidase and SF treated with hyaluronidase and neuraminidase were probed with LPN and with HRP–conjugated PNA.

Article Snippet: A hyaluronan DuoSet ELISA development kit was obtained from R&D Systems, proteinase K was from Roche Applied Science, and MegaLadder and HiLadder HA molecular weight markers were from Hyalose.

Techniques: Enzyme-linked Immunosorbent Assay, Control, Staining, High Molecular Weight, Western Blot

Journal: Arthritis and rheumatism

Article Title: Diminished cartilage-lubricating ability of human osteoarthritic synovial fluid deficient in proteoglycan 4: Restoration through proteoglycan 4 supplementation.

doi: 10.1002/art.34674

Figure Lengend Snippet: Figure 3. Characterization of hyaluronan (HA) in normal and PRG4- deficient OA SF samples. A, Concentrations of HA in normal and PRG4-deficient OA SF samples. B, Molecular weight distribution of HA in normal SF samples (n 8) and in PRG4-deficient OA (OA-LO) SF samples (n 5). Values are the mean SEM. P 0.05. See Figure 1 for other definitions.

Article Snippet: A hyaluronan DuoSet ELISA development kit was obtained from R&D Systems, proteinase K was from Roche Applied Science, and MegaLadder and HiLadder HA molecular weight markers were from Hyalose.

Techniques: Molecular Weight

Journal: Arthritis and rheumatism

Article Title: Diminished cartilage-lubricating ability of human osteoarthritic synovial fluid deficient in proteoglycan 4: Restoration through proteoglycan 4 supplementation.

doi: 10.1002/art.34674

Figure Lengend Snippet: Figure 4. Effect of hyaluronan (HA) and proteoglycan 4 (PRG4) supplementation on the cartilage boundary–lubricating ability of PRG4-deficient osteoarthritic (OA) synovial fluid (SF) samples, as determined by cartilage-on-cartilage friction testing. Two friction coefficients (), static (static, Neq) (A) and kinetic (kinetic, Neq ; at a presliding duration of 1.2 seconds) (B), in phosphate buffered saline (PBS; negative control lubricant), PRG4-deficient OA (OA-LO) SF alone, PRG4-deficient OA SF plus PRG4, PRG4-deficient OA SF plus PRG4 and HA, and normal SF (NL; positive control lubricant) were calculated. Values are the mean SEM. P 0.05. Neq represents equilibrium axial load; angle brackets indicate that the value is an average.

Article Snippet: A hyaluronan DuoSet ELISA development kit was obtained from R&D Systems, proteinase K was from Roche Applied Science, and MegaLadder and HiLadder HA molecular weight markers were from Hyalose.

Techniques: Saline, Negative Control, Positive Control

Journal: Research Square

Article Title: Immune responses in COVID-19 respiratory tract and blood reveal mechanisms of disease severity

doi: 10.21203/rs.3.rs-802084/v1

Figure Lengend Snippet: Higher anti-RBD IgM seroconversion rate in respiratory samples compared to paired blood samples of COVID-19 patients. a ELISA titration curves against the SARS-CoV-2 receptor-binding domain (RBD) for IgM, IgG, and IgA in COVID-19 respiratory and paired blood samples and non-COVID-19 respiratory samples. Dotted lines within each graph indicates the cut-off used to determine end-point titres. b Endpoint titres of SARS-CoV-2 RBD antibodies between (i) respiratory samples of COVID-19 and non-COVID-19 patients, and (ii) plasma and respiratory samples of COVID-19 patients. (i) Bars indicate median with interquartile range. Dotted line indicates the detection level. (ii) Dotted lines connect the most closely matched plasma and respiratory samples from each patient. Statistical significance was determined with Mann-Whitney test. c ELISA titration curves against the SARS-CoV-2 RBD for 3 COVID-19 patients with serial respiratory samples. d Heatmap of percentage (%) inhibition tested by surrogate virus neutralization test (sVNT) and anti-RBD ELISA titres. e Correlation between anti-RBD antibody titres and (%) sVNT inhibition. Correlation was determined with Spearman’s correlation. f Number of (i) samples and (ii) patients with seroconverted anti-RBD IgM, IgG, IgA and positive % sVNT inhibition. Pink curved lines surrounding the donut graphs indicate the samples/patients with seroconverted IgM. Earliest samples were used for each patient when determining seroconversion which was defined as average titre +2xSD of non-COVID-19 samples. Positive % sVNT inhibition was defined as % sVNT inhibition ≥ 20%.

Article Snippet: DuoSet ELISA ancillary reagent kit (R&D Systems) was used for respiratory fluids and in-house reagents with the same composition were used for plasma samples.

Techniques: Enzyme-linked Immunosorbent Assay, Titration, Binding Assay, Clinical Proteomics, MANN-WHITNEY, Inhibition, Virus, Neutralization