. 2015 Aug 8;6(1):34. doi: 10.1186/s40104-015-0032-1

Table 8.

Effects of dietary threonine levels on GSH content and activities of GR, SOD, CAT, GST and GPx in intestine and hepatoancreas of sub-adult grass carp^e

Item	Dietary Thr levels, g/kg diet
	3.3	5.9	8.4	10.9	13.1	15.8
Intestine
GSH, mg/g protein	1.81 ± 0.16^a	1.83 ± 0.13^a	2.56 ± 0.19^b	3.00 ± 0.19^c	5.63 ± 0.22^d	2.98 ± 0.16^c
GR, U/g protein	23.15 ± 1.22^b	24.57 ± 1.95^b	17.05 ± 1.36^a	19.27 ± 1.78^a	27.65 ± 2.82^c	33.59 ± 3.11^d
SOD, U/mg protein	19.84 ± 1.71^a	23.87 ± 2.33^b	23.62 ± 1.13^b	23.41 ± 2.19^b	24.83 ± 1.44^b	23.45 ± 1.84^b
CAT, U/mg protein	11.70 ± 1.03^a	16.65 ± 1.48^c	16.77 ± 1.31^c	22.59 ± 1.94^d	18.06 ± 1.26^c	14.41 ± 1.46^b
GST, U/mg protein	7.08 ± 0.75^a	17.41 ± 1.58^b	16.82 ± 1.48^b	16.13 ± 1.41^b	17.36 ± 1.33^b	17.41 ± 1.58^b
GPx, U/mg protein	105.4 ± 9.7^b	109.4 ± 6.6^b	109.3 ± 4.1^b	107.4 ± 9.3^b	104.9 ± 5.7^b	87.7 ± 8.8^a
Hepatopancreas
GSH, mg/g protein	6.13 ± 0.30^b	7.07 ± 0.41^c	7.06 ± 0.31^c	7.83 ± 0.39^d	6.08 ± 0.29^b	5.67 ± 0.31^a
GR, U/g protein	4.08 ± 0.31^a	13.22 ± 1.02^c	7.74 ± 0.80^b	7.91 ± 0.59^b	7.36 ± 0.73^b	7.58 ± 0.75^b
SOD, U/mg protein	83.16 ± 8.65^b	100.42 ± 6.19^c	80.39 ± 7.06^b	84.66 ± 4.00^b	78.72 ± 5.17^b	66.57 ± 3.08^a
CAT, U/mg protein	55.67 ± 5.95^a	59.11 ± 5.39^a	79.98 ± 7.11^c	69.65 ± 7.34^b	57.94 ± 6.91^a	56.51 ± 5.61^a
GST, U/mg protein	22.51 ± 2.05^b	45.73 ± 2.73^d	44.27 ± 3.78^d	25.80 ± 2.68^c	25.77 ± 2.48^c	17.34 ± 1.66^a
GPx, U/mg protein	961.5 ± 79.2^a	1,205.9 ± 44.5^c	1,041.0 ± 55.3^b	1,053.9 ± 57.1^b	1,026.2 ± 46.4^ab	995.7 ± 47.2^ab

GSH: Glutathione; GR: Glutathione reductase; SOD: Superoxide dismutase; CAT: Catalase; GST: Glutathione-S-transferase; GPx: Glutathione peroxidase

^a,b,c,dMeans in the same row without a letter in common are significantly different (P< 0.05)

^eValues are mean ± SD (n = 6)