Interleukin 10 suppresses experimental chronic, granulomatous inflammation induced by bacterial cell wall polymers.
OBJECTIVE
Interleukin 10 (IL10) inhibits monocyte/macrophage and T lymphocyte effector functions. This study examined the effect of systemically administered IL10 on acute and chronic granulomatous enterocolitis, hepatitis, and arthritis in a rat model.


METHODS
Lewis rats were injected intramurally with streptococcal peptidoglycan-polysaccharide (PG-APS) polymers. Beginning 12 hours before PG-APS injection, rats were treated daily with subcutaneous murine recombinant IL10 or vehicle for three or 17 days.


RESULTS
IL10 attenuated acute enterocolitis in a dose dependent fashion (p < 0.01). Protective effects were more profound in the chronic granulomatous phase with decreased enterocolitis and markedly inhibited leucocytosis, hepatic granulomas, and chronic erosive arthritis (p < 0.001). IL10 downregulated tissue IL1, IL6, tumour necrosis factor alpha, and interferon gamma gene expression, consistent with the in vitro effects of IL10 on PG-APS-stimulated splenocytes. Caecal IL1 protein concentrations and IL2 and interferon gamma secretion by in vitro stimulated mesenteric lymph nodes were downregulated in IL10 treated animals.


CONCLUSIONS
These results indicate that exogenous IL10 can inhibit experimental granulomatous inflammatory responses and suggest that IL10 treatment could be an effective new therapeutic approach in human disorders such as Crohn's disease, rheumatoid arthritis, and sarcoidosis.
Herfarth
H H
HH
Department of Medicine, University of North Carolina, Chapel Hill 27599-7080, USA.
Mohanty
S P
SP
Rath
H C
HC
Tonkonogy
S
S
Sartor
R B
RB
D000199:Actins / Q000276:immunology; D000208:Acute Disease; D000818:Animals; D001169:Arthritis, Experimental / Q000276:immunology / Q000628:therapy*; D001425:Bacterial Outer Membrane Proteins / Q000633:toxicity*; D002908:Chronic Disease; D016207:Cytokines / Q000276:immunology*; D004760:Enterocolitis / Q000276:immunology / Q000628:therapy*; D005260:Female; D006520:Hepatitis, Animal / Q000276:immunology / Q000628:therapy*; D007371:Interferon-gamma / Q000276:immunology; D007375:Interleukin-1 / Q000276:immunology; D016753:Interleukin-10 / Q000627:therapeutic use*; D015850:Interleukin-6 / Q000276:immunology; D016133:Polymerase Chain Reaction; D051381:Rats; D011917:Rats, Inbred Lew; D013047:Specific Pathogen-Free Organisms; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
D000199:Actins; D001425:Bacterial Outer Membrane Proteins; D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D007371:Interferon-gamma