Identification of the C-terminal flanking peptide of preprocholecystokinin in rat brain by a novel radioimmunoassay

The C-terminal flanking peptide of preprocholecystokinin (preproCCK) has been identified in extracts of rat brain using a novel radioimmunoassay. There is a single form of immunoreactive material on gel filtration, ion exchange and reversed-phase HPLC. The C-terminal preproCCK immunoreactivity had a similar pattern of distribution to CCK8 in different regions of rat brain. This assay should help in studies of neuronal CCK biosynthesis.     

用原位杂交法研究大鼠脑损伤后胆囊收缩素和脑啡肽mRNA量的变化

应用原位杂交技术，研究大鼠脑损伤后前胆囊收缩素（ＰＣＣＫ）和前脑啡肽原（ＰＰＥ）ｍＲＮＡ的表达。结果表明，在大鼠脑损伤２４ｈ后同侧脑内ＰＣＣＫ和ＰＰＥｍＲＮＡ量增加，尤其以新皮质和海马显著。给予ＮＭＤＡ受体非竞争性拮抗剂ｋｅｔａｍｉｎｅ可以抑制增加。因此，作者认为在脑损伤后可诱发胆囊收缩素（ＣＣＫ）和脑啡肽（ＥＮＫ）合成增加，并参与脑损伤病理改变，另外这种合成增加可能由ＮＭＤＡ受体介导。