Mean value of proliferative index of PHA activated T cells co-cultured with MSCs in the presence or absence of 1-MT (A), Indomethacin (B), and l-NAME (C). *, #, $p<0.05 significantly different compared to MNC+PHA+BM-MSCs, MNC+PHA+AM-MSC and MNC+PHA+BM-MSCs+1MT, respectively.