家兔内毒素双相热各期脑脊液和血浆cAMP含量的观察

本研究用静脉注射内毒素复制家兔双相热模型,观察双相热各期颈动脉血浆和脑脊液cAMP含量的变化及其与体温变化的关系,结果如下:1.内毒素非热限剂量一次静脉注射引起典型双相热。脑脊液cAMP含量在两个热相高峰期相应出现两个上升波,间歇期体温下降时,脑脊液cAMP含量相应降低,退热后恢复正常。血浆cAMP含量仅在第一热相增高。2.相关检验表明,脑脊液cAMP含量与体温变化呈显著正相关。血浆cAMP含量仅在第一热相与脑脊液cAMP含量相关。以上结果与内生致热原双相热相似,提示内毒素可能主要通过内生致热原以某种方式影响体温调节中枢cAMP的变化,导致双相热型的出现

Observation of cAMP concentration in ccrcbrospinal fluid and plasma during cndotoxic biphasic fever in rabbit

Since the endotoxic fever is mediated essentially by endogenous pyrogen (EP), we have examined the possibility that the central cAMP is involved in the mechanism of biphasic fever induced by endotoxin, as in the case of biphasic fever induced by EP. The results showed that administration of endotoxin in rabbits elicited typical biphasic fever. The fluctuation of concentration of cAMP in cerebrospinal fluid (CSF) paralleled with the change of the rectal temperature, similar to that of the bipbasic fever caused by EP. Raised level of cAMP in plasma was observed only in the first phase. The cAMP concentration in CSF correlated positively with the febrile response. The correlation of cAMP levels in CSF and plasma was observed only in the first phase but not in all the febrilic periods. These findings indicated that the mechanism of endotoxic biphasic fever is associated with the Change of central cAMP. Content. The raised level of cAMP in CSF during fever is likely to represent the biosynthsis in brain regions. However, the possibility that the raised cAMP in plasma enters CSF in the first phase is not excluded.