Background and study aims: Low dose photodynamic therapy (LDPDT) may modify the mucosal immune response and
may thus provide a therapy for Crohn’s disease. We evaluated the efficacy and safety
of this technique in a murine T cell-mediated colitis model.
Methods: The safety of LDPDT was first tested in BALB/c mice. Naïve T cells were used to induce
colitis in mice with severe combined immunodeficiency, which were followed up endoscopically,
and a murine endoscopic index of colitis (MEIC) was developed. The efficacy of LDPDT
(10 J/cm2 ; delta-aminolevulinic acid, 15 mg/kg bodyweight) was then tested on mice with moderate
colitis, while a disease control group received no treatment. The MEIC, weight, length,
and histology of the colon, cytokine expression indices, number of mucosal CD4+ T cells, percentage of apoptotic CD4+ T cells, body weight, and systemic side effects were evaluated.
Results: LDPDT improved the MEIC (P = 0.011) and the histological score (P = 0.025), diminished the expression indices of the proinflammatory cytokines, interleukin-6
(P = 0.042), interleukin-17 (P = 0.029), and interferon-gamma (P = 0.014), decreased the number of mucosal CD4+ T cells, and increased the percentage of apoptotic CD4+ T cells compared with the disease control group. No local or systemic side effects
occurred.
Conclusion: LDPDT improves murine T cell-mediated colitis, decreases the proinflammatory cytokines
interleukin-6, interleukin-17, and interferon-gamma, and decreases the number of CD4+ T cells. No adverse events were observed. Therefore, this technique is now being
evaluated in patients with inflammatory bowel disease.
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M.-A. OrtnerMD
Department of Gastroenterology, DMLL University Hospital “Inselspital” Bern
Murtenstrasse CH-3010 Bern Germany
Fax: +41-31-6329765
Email: ma.ortner@bluewin.ch