Using the Phadia Immunocap assay for mast cell tryptase, we found undetectable levels (<0.1 μg/L) in stool samples from 79 patients with IBS-D and 20/21 healthy controls, even though spiking the sample with pure human mast cell tryptase (MCT, Sigma-Aldrich, Warrington, UK) did show that it could be detected in stool at concentrations down to 5.5 μg/L.
By doing MC tryptase staining by IHC, we detected significantly higher numbers of MCs in the tumors of arthritic versus nonarthritic mice with BC.
To analyse whether GSI XII impairs murine osteoclast differentiation, we used the murine monocyte/macrophage cell line RAW264.7.
To identify MC granules, we also stained the MCs with monoclonal antibody to tryptase.
The same adoptive transfer of MCs may also change MC-specific proteases, although we are currently unable to quantify mouse plasma chymase and tryptase due to a lack of suitable ELISA kits and to the complexity of different mouse chymase (mouse mast cell protease [mMCP]-1, -2, -4, -5, and -9) and tryptase (mMCP-6, -7, and -11) isoforms.
In this study we aimed to evaluate serum tryptase levels in 105 female early breast cancer patients before (STLBS) and after (STLAS) radical surgical resection, mast cell density positive to tryptase (MCDPT) and microvascular density (MVD).
We herein report the evidence of these tryptase-mediated proliferative effects only in colon cancer cells [ 50]; however, tryptase, being a natural agonist of PAR-2 [ 124], may be potentially able to activate this receptor class expressed also in the gastrointestinal tract, pancreas, liver, kidney, and sensory neurons [ 149– 151], triggering a proliferative response.
Due to the release of tryptase from MCs, we suggest that MCDPT in primary BC tumor tissue represents the main source of serum tryptase.
This is confirmed by the finding of Nielsen et al [ 17], who used the same tryptase antibody as we did and also found a positive influence of many mast cells on prognosis.
The tryptase mMCP6 (murine mast cell protease 6) also contributes potently to neutrophil chemotaxis [ 11].
