Feedback induced biphasic response in the chemotaxis pathway of Dictyostelium

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Abstract

Upon uniform stimulation by the chemoattractant cAMP, Dictyostelium cells exhibit a biphasic response. Initially, a rapid rise in the localized accumulation of PI(3,4,5)P 3 is accompanied by an increase in actin polymerization. This response peaks approximately 5-10 seconds after stimulation. It is then followed by a slower, smaller phase peaking approximately two minutes after the stimulus. Until recently, the nature of this biphasic response has been poorly understood. Moreover, the origin for the secondary phase is unknown. In this paper we conjecture the existence of a feedback path between the response and stimulus. Using a mathematical model of the chemoattractant-induced response in cells, and standard tools from control engineering, we show that positive feedback may elicit this second peak. Finally, we discuss some of the literature that suggests the possible existence of this loop.

Original languageEnglish (US)
Article numberFrB13.1
Pages (from-to)4393-4398
Number of pages6
JournalProceedings of the American Control Conference
Volume6
StatePublished - Sep 1 2005
Event2005 American Control Conference, ACC - Portland, OR, United States
Duration: Jun 8 2005Jun 10 2005

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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