Gerisch G, Hess B
Proc Natl Acad Sci U S A. 1974 May;71(5):2118-22. doi: 10.1073/pnas.71.5.2118.
Periodic spikes of decreased optical density were recorded in cell suspensions of Dictyostelium discoideum. Spike formation as well as changes in the redox state of cytochrome b are facultatively and independently coupled to an oscillating system which is under developmental control and presumably underlies signal transmission in aggregating cells. Cyclic AMP triggers a double response, the slow component resembling the spikes formed during spontaneous oscillations. The fast component shows characteristics of the chemotactic response to cyclic AMP. The receptor system is suggested to sense changes of cyclic AMP concentration in time. Cyclic AMP pulses interact with the oscillating system, resulting in phase shift or suppression of spike formation, and in the induction of oscillations in an early stage of development before the onset of spontaneous oscillations. Continuous flow application of cyclic AMP does not change frequency up to flow rates which extinguish oscillations.
在盘基网柄菌的细胞悬液中记录到了光密度降低的周期性尖峰。尖峰的形成以及细胞色素b氧化还原状态的变化与一个振荡系统兼性且独立地耦合,该振荡系统受发育控制,可能是聚集细胞中信号传递的基础。环磷酸腺苷(cAMP)引发双重反应,慢成分类似于自发振荡期间形成的尖峰。快成分显示出对cAMP趋化反应的特征。推测受体系统能及时感知cAMP浓度的变化。cAMP脉冲与振荡系统相互作用,导致尖峰形成的相移或抑制,并在自发振荡开始前的发育早期诱导振荡。持续流动施加cAMP直至流速达到消除振荡的程度时,频率都不会改变。