业已证明:P物质(SP)系初级伤害性传入纤维末梢所释放

与皮肤痛觉的传导有关

参与痛觉调制。曾有报导指出:人穴位区皮肤的肥大细胞明显多于非六区

并见人、小鼠穴区皮肤内肥大细胞与神经轴突形成联接

且肥大细胞中含SP颗粒

针刺后肥大细胞脱颗粒。那么

经六皮Numerous reports indicated that sucstance p (SP) was a neurotransmitterinvolved in nociception

it also had analgesic effects in the most part of the central nervous system of all mammals

including man. The numbers of mast cell inhuman's some acupoint tissue were much higner than the non-acupoint tissue

therewas connection beuween the nerves and mast cells which contained SP particles.Therefore

it is worth studying the change of the concentration of SP in the skinand plasma of rats during the process of acupuncture analgesia. 55 rats were divided into 8 groups; (1) Control group; (2) Heat stimulationgroup; (3) Electro-acupuncture group; (4) Morphine group; (5) Naloxone (NX)group; (6) NX plus electro-acupuncture group; (7) Non-acupoint electro-acupu-ncture group; (8) Normal saline solution group. The concentration of SP in the"channel"、"acupoint" skin and plasma of rats were determined by radioimmunoa-ssay (RIA). The results show that after acupuncture

the tail-flick thresholdis increased

the concentration of SP in the skin and plasma is decreased signifi-cantly and the effect of electro-acupuncture is abolished by naloxone (i. p). Therdsults suggest that SP is a transmitter relating to skin nociception and involves the process of pain regulation. Electro-acupuncture can inhibit SP release fromthe skin and the plasma of rats. There is a functional interaction between SPand endorphin in the effects of electro-acupuncture. That is the SP decrased indu-ced by electro-acupuncture may depend upon the function of opiate receptors