Computational investigations into the orgins of 'short term' biochemical memory in T cell activation

TL;DR

This paper uses computational modeling to explore how T cells remember and integrate signals from antigen-presenting cells, highlighting feedback control of gene products as a key mechanism for short-term biochemical memory.

Contribution

It introduces a simple mathematical model demonstrating that feedback control of immediate early gene products enables effective signal integration in T cell activation.

Findings

Feedback control of IEGs facilitates signal integration.

Model predicts testable experimental outcomes.

Short-term memory arises from specific gene regulation mechanisms.

Abstract

Recent studies have reported that T cells can integrate signals between interrupted encounters with Antigen Presenting Cells (APCs) in such a way that the process of signal integration exhibits a form of memory. Here, we carry out a computational study using a simple mathematical model of T cell activation to investigate the ramifications of interrupted T cell-APC contacts on signal integration. We consider several mechanisms of how signal integration at these time scales may be achieved and conclude that feedback control of immediate early gene products (IEGs) appears to be a highly plausible mechanism that allows for effective signal integration and cytokine production from multiple exposures to APCs. Analysis of these computer simulations provides an experimental roadmap involving several testable predictions.