Abstract
Background: The human anti-tumour necrosis factor (TNF) antibody infliximab binds to the membrane TNF and subsequently induces apoptosis of activated lamina propria T lymphocytes in patients with Crohn's disease in vitro.
Aim: To test whether the ability of rapid anti-TNF-induced apoptosis in the gut predicts the efficacy of anti-TNF treatment in inflammatory bowel disease.
Methods: (99m)Technetium-annexin V single-photon emission computer tomography (SPECT) was performed in 2 models of murine experimental colitis and in 14 patients with active Crohn's disease as assessed by the Crohns Disease Activity Index (CDAI) to study the effect of anti-TNF treatment on apoptosis in the intestine during active colitis. Disease activity was evaluated 2 weeks after infliximab infusion using the CDAI (definition response: drop of > 100 points).
Results: Colonic uptake of Tc-99m-annexin V significantly increased in 2,4,6- trinitrobenzene sulphonate-induced colitis as well as in transfer colitis on administration of anti-TNF antibodies compared with a control antibody as determined with dedicated animal pinhole SPECT. In addition, uptake of T-99m-annexin V significantly increased in patients with active Crohn's disease responding to infliximab treatment. Colonic 99mTc-annexin V uptake ratio (mean (SEM)) increased from 0.24 (0.03) to 0.41(0.07) (p <0.01), 24 h after infliximab infusion (5 mg/kg). A mean increase of 98.7% in colonic uptake of 99mTc-annexin V could be detected in 10 of the 14 responding patients (CDAI.100 points at week 2) compared with 15.2% in non-responding patients (p = 0.03). Analysis of the mucosal biopsy specimens identified lamina propria T cells as target cells undergoing apoptosis.
Conclusions: These in vivo observations support the notion that colonic uptake of 99mTc-annexin V correlates with clinical benefit of anti-TNF treatment and might be predictive of therapeutic success.
| Original language | English |
|---|---|
| Pages (from-to) | 509-517 |
| Number of pages | 9 |
| Journal | Gut |
| Volume | 56 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr-2007 |
Keywords
- CHIMERIC MONOCLONAL-ANTIBODY
- RADIOLABELED ANNEXIN-V
- INFLIXIMAB INDUCES APOPTOSIS
- CASPASE-DEPENDENT PATHWAY
- PROPRIA T-LYMPHOCYTES
- IN-VIVO DETECTION
- FACTOR-ALPHA CA2
- TNF-ALPHA
- RHEUMATOID-ARTHRITIS
- CELL-DEATH
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