Table 1.

IL-2 secretion by PBL isolated from PAC and MSC + PAC rats cultured alone or with PAC for 24 h.

Time and number of rats	Cohorts	IL-2 (pg/ml) (mean ± SEM) and condition
		PBL	PBL + ConA	PBL + PAC	PBL + PAC + ConA
5 weeks (n = 3)	PAC	89 ± 35	76 ± 31	53 ± 33	118 ± 53
	MSC + PAC	193 ± 68	128 ± 27	148 ± 47	274 ± 86

PBL from the indicated number of rats were isolated and cultured separately in triplicates. Activation of the primary signal was conducted with ConA when indicated.

MSC, mesenchymal stem cells; PAC, porcine articular chondrocytes; PBL, peripheral blood lymphocytes.