[Efficacy and safety evaluation of fire needling for rats with rheumatoid arthritis]

To explore the therapeutic effect and safety of fire needling on rat with rheumatoid arthritis.

Forty female Wistar rats were randomly divided into a normal group, a model group, a methotrexate (MTX) group and a fire needling group, 10 rats in each group. The 0.1 mL of normal saline was subcutaneously injected in rat's right back paw in the normal group, while the other groups received subcutaneous injection of 0.1 mL of complete Freund's adjuvant to establish the model. The pricking method was applied in the fire needling group at "Jiaji" (EX-B 2), "Zusanli" (ST 36) and Ashi points with a depth of 5 mm, once every three days, and totally eight times were required. In the MTX group, with intragastric administration of 2.0 mg/kg per rat, the treatment was given once every seven days, and totally four times were required. The weight, swelling rate of foot, joint pain score and polyarthritis index of rats in each group as well as the pathological change of liver tissue under light microscope were observed.

The weight, swelling rate of foot, joint pain score and polyarthritis index in the model group were significantly higher than those in the normal group (P < 0.05, P < 0.01), after the treatment, the above-mentioned indexes in the two treatment groups were obviouly dereased as componed with those in the model group (all P < 0.01), and there were statistical differences between the fire needling group and MTX group (P < 0.05, P < 0.01). Compared with the normal group, inflammatory cells were appeared with a cluster distribution in the liver cells of rats in the model group. The inflammatory cells were reduced in the MTX group and fire needling group, and liver cells had degenerative edema and cell nucleus were largen and deformed in the MTX group.

The fire needling has significant efficacy for rats with adjuvant arthritis (AA) without any damage to the liver, which coud have a better control of disease progression of rheumatoid arthritis .