Pouchitis is associated with mucosal imbalance between interleukin-8 and interleukin-10.
BACKGROUND
Mucosal lesions of pouchitis are characterized by a neutrophil infiltrate. Interleukin (IL)-8 is the main mediator involved in neutrophil recruitment and is down-regulated by IL-10.


OBJECTIVE
To look for an imbalance between IL-8 and IL-10 in patients with pouchitis.


METHODS
18 patients having an ileoanal pouch for ulcerative colitis were studied. Eleven had pouchitis defined by the pouchitis disease activity index of > or =7 points and 7 had no history of pouchitis. Biopsies taken at the site of inflammation or in the normal mucosa were scored for the histologic lesions, the intensity of neutrophil infiltration, and the presence of crypt abscesses. Mucosal IL-8 and IL-10 mRNA were quantified by competitive polymerase chain reaction.


RESULTS
IL-8, IL-10, and IL-10/IL-8 mRNA were similar in patients with or without pouchitis. IL-8 mRNA levels were significantly higher in patients with a histologic score >2 (p = 0.01) and in patients with crypt abscesses (p = 0.01). IL-10/IL-8 mRNA was significantly lower in patients having a histologic score >2 (p = 0.019), a neutrophil infiltration > or =10% (p = 0.013), and crypt abscesses (p = 0.01).


CONCLUSIONS
Histologic lesions of pouchitis are associated with a mucosal imbalance between IL-8 and IL-10. IL-10 could be proposed as a new treatment for pouchitis.
Bulois
P
P
Laboratoire de Recherche des Maladies Inflammatoires Intestinales, CHU Lille, France.
Tremaine
W J
WJ
Maunoury
V
V
Gambiez
L
L
Hafraoui
S
S
Leteurtre
L
L
Cortot
A
A
Sandborn
W J
WJ
Colombel
J F
JF
Desreumaux
P
P
D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; D000293:Adolescent; D000328:Adult; D006801:Humans; D007249:Inflammation; D016753:Interleukin-10 / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D016209:Interleukin-8 / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D007413:Intestinal Mucosa / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D019449:Pouchitis / Q000276:immunology* / Q000473:pathology; D012333:RNA, Messenger / Q000032:analysis
D016209:Interleukin-8; D012333:RNA, Messenger; D016753:Interleukin-10; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione