Table I.

Primer sequences of the genes for RT-PCR.

Gene name	Forward (5'-3')	Reverse (5'-3')
Collagen II	TGGACGATCAGGCGAAACC	GCTGCGGATGCTCTCAATCT
ATF4	ATGACCGAAATGAGCTTCCTG	GCTGGAGAACCCATGAGGT
CHOP	GGAAACAGAGTGGTCATTCCC	CTGCTTGAGCCGTTCATTCTC
Caspase-9	CTTCGTTTCTGCGAACTAACAGG	GCACCACTGGGGTAAGGTTT
GAPDH	ACAACTTTGGTATCGTGGAAGG	GCCATCACGCCACAGTTTC

RT-PCR, quantitative reverse-transcription polymerase chain reaction; ATF4, activating transcription factor 4; CHOP, C/EBP homologous protein; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.