Differences in the serum concentrations of TRP-KYN pathway metabolites between HCs and PSOs

Metabolites HCs (mean ± SD) PSOs (mean ± SD)
TRP (μM) 52.9 ± 7.26 48.0 ± 8.34 **
KYN (μM) 2.00 ± 0.49 1.73 ± 0.47 **
KYNA (nM) 37.6 ± 9.81 32.0 ± 16.8 *
AA (nM) 17.1 ± 6.78 16.0 ± 12.2
3HK (nM) 18.8 ± 12.9 18.6 ± 8.76
3HAA (nM) 7.56 ± 4.52 14.2 ± 6.22 ***

P < 0.05; **P < 0.01;***P < 0.001 vs. HCs