Objective To explore whether the cAMP-PKA-pCREB signal pathway plays a role in promoting the recovery of motor function after rehabilitation training in cerebral ischemia-reperfusion rats .Methods The middle cerebral artery occlusion model ( MCAO) was established by modified Longa nylon occlusion method in adult male Sprague -Dawley rats.The 84 MCAO rats were selected and randomly assigned to four groups:the natural recovery group without any special training (group B, n=24),natural recovery group with Rp-cAMP (group C, n=24), rehabilitation training group (group D, n=18) and rehabilitation training with Rp-cAMP (group E, n=18), and in addition a control group (group A, n =12).To establish rat MCAO models immediately after injection of Rp-cAMP into the lateral ventricle of the brain .The rats in the groups D and E were trained by balance beam , bar rotating and rolling exercises started at 48 h after MCAO.The ex-pression of PKA was determined by enzyme-linked immunosorbent assay ( ELISA) and the pCREB protein expression was detected by Western blot assay .Motor function was assessed by balance beam test .Results (1) The motor function score in the group C was significantly higher than that of group B , suggesting that Rp-cAMP inhibited the recovery of motor func-tion in the cerebral ischemia-reperfusion rats .The score of group D was significantly lower than that of groups B and E , in-dicating that Rp-cAMP inhibited the promoting effect of rehabilitation training on motor function in the cerebral ischemia -reperfusion rats.(2) The expressions of PKA and pCREB proteins detected at 2nd, 7th, 14th, and 21th days after surgery showed that their expressions in the group D were significantly higher than those of the groups B and E , indicating that re-habilitation training promoted the expression of PKA and pCREB , and Rp-cAMP significantly inhibited the promoting effect of rehabilitation training on the expressions of PKA and pCREB proteins .Conclusion cAMP/PKA-pCREB signal trans-duction pathway may mediate a promoting effect of rehabilitation training on the recovery of motor function after ischemic stroke in rats.

Through consulting the ancient herbal and medical books， combined with the field investigation， the name， origin， collection and processing of Dendrobium medicinal materials were researched， which provided a basis for the development of famous classical formulas containing this kind of herbs. Due to the wide distribution of D. officinale， the Dendrobium species represented by D. officinale and D. huoshanense， which are short， fleshy and rich in mucus， should be the most mainstream of Dendrobium medicinal materials in previous dynasties. Compared with Shihu， Muhu with loose texture， long and hollow is born on trees. According to the characteristic description， it should be D. nobile， D. fimbriatum and so on， of which D. nobile was the mainstream. The Chinese meaning of Jinchai was confused in the past dynasties， so it was not suitable to be treated as a plant name. The production areas of Dendrobium medicinal materials in the past dynasties have changed with the discovery of varieties， artificial cultivation and other factors. Lu'an， Anhui province， was the earliest recorded in the Han and Wei dynasties. Since the Tang and Song dynasties， it had been extended to Guangdong and Guangxi， and it was considered that "Dendrobii Caulis in Guangnan was the best". In the Ming dynasty， Sichuan and Zhejiang products were highly praised， and in the Qing dynasty， Huoshan products were highly praised. Dendrobium medicinal materials had been used as medicine by stems in all dynasties. The medicinal materials were divided into fresh products and dry products. The fresh products can be used immediately after removing the sediment from the roots. The dry products need further processing， most of them used wine as auxiliary materials for steaming， simmer to paste or decoction into medicine. D. officinale and D. huoshanense have special processing specifications since the middle of Qing dynasty， that is， "Fengdou". According to the research results， in Ganluyin， the effect of Dendrobium medicinal materials is mainly heat clearing， and D. nobile with bitter taste can be selected. The main effect of Dendrobium medicinal materials in Dihuang Yinzi is tonic， D. officinale or D. huoshanense can be selected.