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The Immunomodulatory Imbalance in Patients with Ketamine Cystitis
Gang-Yi Fan1, Juin-Hong Cherng2, Shu-Jen Chang3
1Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan.
Insights
Ketamine cystitis (KC) involves an immune response, with higher IgE, IL-6, and IFN-γ levels and increased T helper cells (TH1, TH2, TH17) observed in patients. This suggests a potential immune mechanism contributing to irreversible bladder damage.
Area of Science:
- Immunology
- Urology
- Pharmacology
Background:
- Ketamine cystitis (KC) is linked to immune responses, but the exact pathogenesis remains unclear.
- Understanding the immune mechanisms is crucial for addressing irreversible bladder damage in KC patients.
Purpose of the Study:
- To propose a potential immune mechanism underlying the irreversible bladder damage in ketamine cystitis (KC).
- To investigate the roles of specific immune cells and cytokines in KC pathogenesis.
Main Methods:
- Retrospective assessment of 53 KC patients and 21 healthy controls.
- Measurement of serum immunoglobulin E (IgE), IL-6, IFN-γ, TGF-β, IL-2, and IL-4 levels.
- Quantification of T helper cell subsets (TH1, TH2, TH17) and regulatory T cells (TREG).
Main Results:
- KC patients exhibited significantly elevated serum IgE, IL-6, and IFN-γ compared to controls.
- KC patients showed significantly higher counts of TH1, TH2, and TH17 cells.
- Reduced TGF-β levels and comparable IL-2 and IL-4 levels were observed in KC patients.
Conclusions:
- The immune response in KC may involve IL-6 driven differentiation of TH17 cells, followed by TH1/TH2 alternation.
- IL-6 may suppress TREG cells, exacerbating chronic inflammation and contributing to KC pathogenesis.
- Imbalances in TH17 and TREG cells are implicated in KC, warranting further investigation into IL-6's role in related signaling pathways.
Abstract:
The pathogenesis of ketamine cystitis (KC) has been recently linked with immune response to patients but the same has not yet been established. Hence, this study aims to propose a possible immune mechanism of irreversible bladder damage caused by KC. A total of 53 KC patients and 21 healthy volunteers as controls have been retrospectively assessed. The levels of serum immunoglobulin E (IgE), IL-6, and IFN-γ of KC patients were significantly higher than those of controls, whereas the TGF-β levels of KC patients substantially reduced but the IL-2 and IL-4 levels of KC patients were comparable to those of controls. Moreover, the KC patients had significantly higher counts of TH1, TH2, and TH17 cells than those of controls. The immune response of KC users may begin with the IL-6 production and differentiation of TH17 and may be followed by alternating between high expressions of TH1 and TH2. The IL-6 may further suppress the TREG cells which can aggravate chronic inflammation in KC patients and the imbalance in TH17 and TREG cells may involve the pathogenesis of KC. Further investigation is needed to define the role of IL-6 in TH1/TH2/TH17-regulated signaling pathway in ketamine-induced cystitis.
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