In vivo mucosal delivery of bioactive human interleukin 1 receptor antagonist produced by Streptococcus gordonii

Table 1 IL-1ra in the gastro-intestinal tract of mice inoculated intragastrically with recombinant S. gordonii GP1294.

	IL-1ra (OD₄₅₀) at different time points after bacterial inoculum^a
Sample ^b	(day 3)	(day 11)	(day 28)
Stomach	0.478	0.244	0.000
Small intestine	0.061	0.062	0.000
Caecum	0.051	0.029	0.000
Colon	0.028	0.055	0.000
Caecum content	0.026	0.283	0.000
Faeces	0.036	0.025	0.000

^a The presence of IL-1ra was determined by ELISA and expressed as net OD readings at 450 nm. As reference, standard IL-1ra readings were the following: 50 pg/ml, 0.018; 100 pg/ml, 0.030; 500 pg/ml, 0.236; 1000 pg/ml, 0.575. ^b IL-2^-/- mice inoculated with the IL-1ra-expressing S. gordonii GP1294 strain were sacrificed 3, 11, and 28 days after the last inoculum. Different parts of the GI tract were removed, homogenised, and subjected to ELISA. Culture supernatants of strains GP1294 and GP204 were used as positive and negative controls, respectively.

ISSN: 1472-6750