Title: Selective alpha7 nicotinic acetylcholine receptor agonists worsen disease in experimental colitis
Authors: Snoek, Susanne A ×
Verstege, Marleen I
van der Zanden, Esmerij P
Deeks, Nigel
Bulmer, David C
Skynner, Michael
Lee, Kevin
Te Velde, Anje A
Boeckxstaens, Guy
de Jonge, Wouter J #
Issue Date: May-2010
Series Title: British journal of pharmacology vol:160 issue:2 pages:322-333
Abstract: BACKGROUND AND PURPOSE: In various models vagus nerve activation has been shown to ameliorate intestinal inflammation, via nicotinic acetylcholine receptors (nAChRs) expressed on immune cells. As the alpha7 nAChR has been put forward to mediate this effect, we studied the effect of nicotine and two selective alpha7 nAChR agonists (AR-R17779, (-)-spiro[1-azabicyclo[2.2.2] octane-3,5'-oxazolidin-2'-one and GSK1345038A) on disease severity in two mouse models of experimental colitis. EXPERIMENTAL APPROACH: Colitis was induced by administration of 1.5% dextran sodium sulphate (DSS) in drinking water or 2 mg 2,4,6-trinitrobenzene sulphonic acid (TNBS) intrarectally. Nicotine (0.25 and 2.50, AR-R17779 (0.6-30 or GSK1345038A (6-120 was administered daily by i.p. injection. After 7 (DSS) or 5 (TNBS) days clinical parameters and colonic inflammation were scored. KEY RESULTS: Nicotine and both alpha7 nAChR agonists reduced the activation of NF-kappaB and pro-inflammatory cytokines in whole blood and macrophage cultures. In DSS colitis, nicotine treatment reduced colonic cytokine production, but failed to reduce disease parameters. Reciprocally, treatment with AR-R17779 or GSK1345038A worsened disease and led to increased colonic pro-inflammatory cytokine levels in DSS colitis. The highest doses of GSK1345038A (120 and AR-R17779 (30 ameliorated clinical parameters, without affecting colonic inflammation. Neither agonist ameliorated TNBS-induced colitis. CONCLUSIONS AND IMPLICATIONS: Although nicotine reduced cytokine responses in vitro, both selective alpha7 nAChR agonists worsened the effects of DSS-induced colitis or were ineffective in those of TNBS-induced colitis. Our data indicate the need for caution in evaluating alpha7 nAChR as a drug target in colitis.
ISSN: 0007-1188
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Translational Research in GastroIntestinal Disorders
× corresponding author
# (joint) last author

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