Table 1. Values of mitochondrial respiratory chain complexes in cultures of normal chondrocytes treated with 20 ng/ml T-2 toxin for 5 days.

	Control	20 ng/ml T-2	20 ng/ml T-2+1 µM Se
n	8	8	8
Age (years old)	45.38±8.78	45.38±8.78	45.38±8.78
Proteins (mg/ml)	2.98±0.47	2.55±0.68	2.75±0.55
CS enzymatic activity (nmol/minute/mg protein)	95.39±15.62	88.99±12.21	94.21±13.70
Mitochondrial complex activity†
Complex I	33.54±6.84	28.71±5.30	30.94±6.84
Complex II	13.65±2.58	11.24±1.94	12.64±2.53
Complex III	55.35±7.29	47.70±3.88*	53.32±5.24
Complex IV	50.41±5.79	39.91±5.36*	46.65±6.50#
Complex V	53.44±9.84	42.26±8.46*	51.95±8.83#

Values are the mean ± SD. CS = citrate synthase. †CS-corrected complex activity is expressed as (nmoles/minute/mg protein)/(CS specific activity) ×100. *P<0.05 versus normal chondrocytes. #P<0.05 versus 20 ng/ml T-2 toxin group. Complex I = rotenone-sensitive NADH-coenzyme Q1 reductase; complex II = succinate dehydrogenase; complex III = antimycin-sensitive ubiquinol cytochrome c reductase; complex IV = cytochrome c oxidase; complex V = ATP synthase.