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Subtypes of bladder mast cells in interstitial cystitis
1Department of Urology, Sagamihara National Hospital, Kanagawa, Japan. susumu-y@mte.biglobe.ne.jp
Summary
Interstitial cystitis (IC) patients show increased mast cells in the bladder. Tryptase-positive and chymase-positive mast cells (MC(TC)) were dominant and correlated with reduced bladder capacity in IC.
Area of Science:
- Urology
- Immunology
- Pathology
Background:
- Mast cells in interstitial cystitis (IC) bladders remain poorly understood.
- Immunohistochemical analysis is crucial for identifying specific mast cell subtypes.
Purpose of the Study:
- To elucidate the types of mast cells present in the bladders of IC patients.
- To compare mast cell populations in IC patients versus controls.
Main Methods:
- Biopsy specimens from 10 IC patients and 6 controls were analyzed.
- Immunohistochemistry used antitryptase and antichymase antibodies on tissue sections.
- Toluidine blue staining was used for comparison.
Main Results:
- IC bladders had significantly higher numbers of tryptase-positive/chymase-negative (MC(T)) and tryptase-positive/chymase-positive (MC(TC)) mast cells compared to controls.
- A significant negative correlation was found between MC(TC) numbers and bladder capacity (P<0.005).
- Toluidine blue underestimated mast cell counts compared to immunohistochemistry.
Conclusions:
- Mast cell numbers are significantly elevated in both mucosa and detrusor of IC bladders.
- MC(TC) appear to be the predominant mast cell type in IC bladders.
- Increased MC(TC) in the detrusor correlate with bladder contraction progression.