Table 4. Protein and gene expression of transient receptor potential ankyrin 1 and transient receptor potential vanilloid 4 in normal and knee osteoarthritis groups.

Group (n=15)	TRPA1 (protein)	TRPV41 (protein)	TRPA1 (mRNA)	TRPV4 (mRNA)
	Mean±SEM	Mean±SEM	Mean±SEM	Mean±SEM
Normal	0.138±0.071	0.494±0.074	1.020±0.237	1.058±0.089
Knee osteoarthritis	0.560±0.283**	0.729±0.130**	4.418±1.886**	3.679±0.754**
SEM: Standard error of the mean; * p<0.05, ** p<0.01, compared with normal group; TRPA1: Transient receptor potential ankyrin 1; TRPV4: Transient receptor potential vanilloid 4; mRNA: Messenger ribonucleic acid.