murine anti human par 2 antibody mab3949  (R&D Systems)

Journal: Cellular and Molecular Neurobiology

Article Title: Procoagulant Extracellular Vesicles Increase Neuronal Tau expression, Metabolism and Processing Through Tissue Factor and Protease Activated Receptor 2

doi: 10.1007/s10571-025-01658-7

Figure Lengend Snippet: Examination of the mechanism of influence of TF on Tau protein expression and phosphorylation in differentiated SH-SY5Y cells. SH-SY5Y (2 × 10 5 ) were treated with recombinant relipidated Innovin TF (0.65 ng/ml) together with or without human fVIIa (5 nM) or fVIIa alone. In some experiments, the TF aliquots were pre-incubated for 1 h, with 10H10 antibody (20 µg/ml) capable of blocking TF signalling, HTF-1 antibody (20 µg/ml) to block TF-fVIIa protease/procoagulant activity, or a mouse control isotype IgG antibody (20 µg/ml; not shown). In other experiments, fVIIa was pre-incubated for 1 h with the chemical inhibitor PCI27483 (10 µg/ml). Alternatively, the neuronal cells were treated with AIIB2 antibody (20 µg/ml) to block β1-integrin signalling, SAM11 antibody (20 µg/ml) capable of blocking PAR2 signalling, or PAR2-activating peptide (PAR2-AP; 20 µM) to induce PAR2 signalling. Cells were harvested at 24 h, and cellular lysates (10 µg protein) were examined for Tau and phospho-Thr181 Tau by western blot analysis. All values were normalised against the respective GAPDH and for comparison, all ratios were calculated against the average from the non-treated cells ± the calculated standard deviation. The number of experiments is shown in each column, and all data groups were determined to have normal distributions and are shown in each column. A SH-SY5Y protein electrophoresis, B SH-SY5Y phospho-Thr181 Tau electrophoresis, C SH-SY5Y Tau protein ratio, and D SH-SY5Y phospho-Thr181 Tau ratio

Article Snippet: Alternatively, the neuronal cells were treated with a rat anti-human antibody (20 μg/ml; AIIB2; Merck KGaA) to block β1-integrin signalling, a mouse anti-human PAR2 antibody, SAM11 (20 μg/ml; Santa Cruz Biotechnology, Heidelberg, Germany), capable of blocking PAR2 signalling, or PAR2-activating peptide (PAR2-AP; 20 μM) to induce PAR2 signalling.

Techniques: Expressing, Phospho-proteomics, Recombinant, Incubation, Blocking Assay, Activity Assay, Control, Western Blot, Comparison, Standard Deviation, Protein Electrophoresis, Electrophoresis

Journal: Cellular and Molecular Neurobiology

Article Title: Procoagulant Extracellular Vesicles Increase Neuronal Tau expression, Metabolism and Processing Through Tissue Factor and Protease Activated Receptor 2

doi: 10.1007/s10571-025-01658-7

Figure Lengend Snippet: Time-course analysis of the Tau protein fragments in differentiated SH-SY5Y cells, following treatment with TF . SH-SY5Y (2 × 10 5 ) were treated with as single dose of recombinant relipidated Innovin TF (0.65 ng/ml) together with human fVIIa (5 nM). In some experiments, the TF aliquots were pre-incubated for 1 h, with 10H10 antibody (20 µg/ml) capable of blocking TF signalling, HTF-1 antibody (20 µg/ml) to block TF-fVIIa protease/procoagulant activity, or a mouse control isotype IgG antibody (20 µg/ml; not shown). Alternatively, the neuronal cells were treated with AIIB2 antibody (20 µg/ml) to block β1-integrin signalling, or SAM11 antibody (20 µg/ml) capable of blocking PAR2 signalling. Sets of cells were harvested at A 48 h and D at 72 h and cellular lysates (10 µg protein) were examined for Tau by western blot analysis. All values were normalised against the respective GAPDH (see Supplementary Fig. 6 A and B) and for comparison, all ratios were calculated against the average from the non-treated cells ± the calculated standard deviation. The data were obtained from 6 biological experiments, and all data groups were determined to have normal distributions. A Electrophoresis at 48 h, B calculated ratios of 50 kDa bands at 48 h, C calculated ratios of 30–35 kDa bands at 48 h, D electrophoresis at 72 h, E calculated ratios of 50 kDa bands at 72 h, F calculated ratios of 40 kDa bands at 72 h, G calculated ratios of 30–35 kDa bands at 72 h

Article Snippet: Alternatively, the neuronal cells were treated with a rat anti-human antibody (20 μg/ml; AIIB2; Merck KGaA) to block β1-integrin signalling, a mouse anti-human PAR2 antibody, SAM11 (20 μg/ml; Santa Cruz Biotechnology, Heidelberg, Germany), capable of blocking PAR2 signalling, or PAR2-activating peptide (PAR2-AP; 20 μM) to induce PAR2 signalling.

Techniques: Recombinant, Incubation, Blocking Assay, Activity Assay, Control, Western Blot, Comparison, Standard Deviation, Electrophoresis

Journal: Brain

Article Title: Efficacy of MEDI0618, a pH-dependent monoclonal antibody targeting PAR2, in preclinical models of migraine

doi: 10.1093/brain/awae344

Figure Lengend Snippet: Specificity and potency of anti-PAR2 monoclonal antibody MEDI0618 . ( A ) Live staining of PAR2-expressing (1321N1-hPAR2.cl8) or non-expressing (1321N1 parental) cell lines with MEDI0618 directly conjugated to Alexa Fluor 647. Scale bar = 20 µm. ( B ) Flow cytometry of hPAR2 overexpressing cells (1321N1-hPAR2.cl8) or non-expressing cells (1321N1 parental cell line) or A549 cells endogenously expressing hPAR2 live labelled with MEDI0618. ( C and D ) Calcium imaging from 1321N1-hPAR2 cells pretreated with MEDI0618 hIgG or an isotype control protein. ( C ) Exemplar raw calcium trace from a single well pretreated with MEDI0618 or isotype control antibody both at 1 nM, followed by PAR2 agonist stimulation with matriptase (10 nM). ( D ) Antibody titration of the anti-PAR2 antibodies MEDI0618 or PAR650097 or an isotype control antibody. Data show the matriptase (10 nM)-mediated calcium signal after preincubation with antibody and normalized to the matriptase response in the absence of antibody treatment. ( E ) Calcium imaging from A549 cells pretreated with MEDI0618, isotype control protein or PAR1 inhibitors (ATAP2 + WEDE15 mAbs) followed by 10 nM thrombin (PAR1 agonist) stimulation. Data are presented as mean ± standard error of the mean, n = 4. The concentration of the inhibitor is shown on the x -axis. Data are normalized to the peak thrombin calcium response in the absence of inhibitor pretreatment.

Article Snippet: The 1321N1 parental cell line (lacking PAR2 expression), 1321N1 cells stably expressing human PAR2 (1321N1-hPAR2.cl8) (generated in-house at AstraZeneca) or A549 cells endogenously expressing hPAR2 were pre-stained with LIVE/DEADTM dead cell stain (ThermoFisher); 7.5 × 10 6 cells from each line were collected in total and stained in 7.5 ml phosphate buffered saline (PBS) (ice-cold) with 1× violet dead cell stain for 30 min on ice.

Techniques: Staining, Expressing, Flow Cytometry, Imaging, Control, Titration, Concentration Assay

Journal: Brain

Article Title: Efficacy of MEDI0618, a pH-dependent monoclonal antibody targeting PAR2, in preclinical models of migraine

doi: 10.1093/brain/awae344

Figure Lengend Snippet: PAR2 functional expression in human and mouse cells relevant to migraine . Whole well calcium imaging from primary human dural fibroblasts (HDuF), human dural microvascular endothelial (HDuMEC) and mouse brain endothelial (bEnd.3) cells. ( A , D and G ) PAR2 agonists concentration response curve in ( A ) HDuF, ( D ) HDuMEC and ( G ) bEnd.3 cells. ( B , E and F ) Effect of MEDI0618 and isotype control protein (IgG) on inhibition of matriptase-induced calcium signalling at 30 nM in ( B ) HDuF, ( E ) HDuMEC and ( H ) bEnd.3 cells. ( C , F and I ) Representative calcium imaging traces of 30 nM matriptase-evoked activity following MEDI0618 or isotype control protein preincubation in ( C ) HDuF, ( F ) HDuMEC and ( I ) bEnd.3 cells. ( J and K ) Single-cell calcium imaging from mouse trigeminal neuron cultures. ( J ) Pseudocolour images of fura-2 ratio intensity show a subset of trigeminal neurons activated by treatment with 10 µM LIGRLO in comparison to 20 mM KCl treatment. Scale bar = 20 µm. ( K ) Representation of fura-2 traces recorded from two individual neurons during acute LIGRLO (10 µM) or KCl (20 mM) treatment.

Article Snippet: The 1321N1 parental cell line (lacking PAR2 expression), 1321N1 cells stably expressing human PAR2 (1321N1-hPAR2.cl8) (generated in-house at AstraZeneca) or A549 cells endogenously expressing hPAR2 were pre-stained with LIVE/DEADTM dead cell stain (ThermoFisher); 7.5 × 10 6 cells from each line were collected in total and stained in 7.5 ml phosphate buffered saline (PBS) (ice-cold) with 1× violet dead cell stain for 30 min on ice.

Techniques: Functional Assay, Expressing, Imaging, Concentration Assay, Control, Inhibition, Activity Assay, Comparison