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Increased number of apoptotic endothelial cells in bladder of interstitial cystitis patients

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Abstract

In this study, we aimed to investigate possible abnormality of bladder endothelial cells in interstitial cystitis patients by detecting morphological changes such as apoptosis in bladder endothelial cells. A bladder biopsy specimen was collected from interstitial cystitis patients immediately after hydrodistension therapy. The patients were classified into two groups on the basis of their predominant symptom, one group of patients with bladder pain and another group of patients with urinary urgency. Dissociated cells from the biopsy specimen were analyzed by flow cytometry after staining with Annexin V and an anti-CD105 antibody. Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) and electron microscopy were performed to confirm morphologic changes indicative of apoptosis. The percentage of Annexin V binding, an early apoptosis marker, was significantly higher in bladder endothelial cells from interstitial cystitis patients with pain [median 24.7% (range 15.1–77.2), n = 20, P < 0.01) than that from interstitial cystitis patients with urinary urgency [9.3% (range 0.7–19.11) n = 17) or control patients [1.5% (range 0.8–9.1), n = 7]. TUNEL staining showed apoptotic cells in microvascular endothelial cells but not in the endothelial cells of a venule. By electron microscopy, endothelial cells showed morphological changes indicative of apoptosis such as nuclear fragmentation. Our results indicate that increased apoptosis of bladder microvascular endothelial cells may play an important role in the pathogenesis of interstitial cystitis accompanied by bladder pain.

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Acknowledgment

The authors are indebted to Dr. Hiroyuki Mitomi, chief of the pathology section of Sagamihara National Hospital, for helpful discussion about our study.

Conflict of interest

The authors have no conflicting financial interests.

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Authors and Affiliations

  1. Department of Urology, Sagamihara National Hospital, 18-1 Sakuradai, Sagamihara, Kanagawa, 228-8522, Japan

    Tetsuo Yamada

  2. Clinical Research Center, Sagamihara National Hospital, Sagamihara, Kanagawa, 228-8522, Japan

    Haruhisa Mita

  3. Research and Development Department, Central Blood Institute, Japanese Red Cross Society, 2-1-67 Tatsumi, Koto-ku, Tokyo, 135-8521, Japan

    Motoko Nishimura

Authors
  1. Tetsuo Yamada
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  2. Motoko Nishimura
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  3. Haruhisa Mita
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Correspondence to Tetsuo Yamada.

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Yamada, T., Nishimura, M. & Mita, H. Increased number of apoptotic endothelial cells in bladder of interstitial cystitis patients. World J Urol 25, 407–413 (2007). https://doi.org/10.1007/s00345-007-0174-7

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  • DOI: https://doi.org/10.1007/s00345-007-0174-7

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