用于記憶CD8+T細胞的自助程序：CD40-CD40L信號的正反饋作為二次擴展的關鍵決定因素

作者：Ja Shugart，S Bambina，AF Alice，R Montler，KS Bahjat

動物

應用信息

描述：

記憶性CD8+T細胞快速增殖和獲得溶細胞活性是保護細胞內病原體免疫的關鍵。控制這一召回反應的信號仍不清楚。提示當全身炎癥受*，記憶CD8+T細胞自身產生CD40L是二次擴張的重要催化劑。二次免疫同時伴有高水平的全身炎癥，導致CD8+T細胞繼發增殖，獨立于CD4+T細胞和CD40-CD40L信號。相反，當炎癥反應受*，記憶中CD8+T細胞的二次擴張需要產生CD40L的細胞，而記憶的CD8+T細胞可以提供這一信號。這些結果表明，免疫接種方案對CD40L表達的CD8+T細胞的依賴性不同，提示CD8+T細胞的CD40L表達是一種在炎癥受*促進記憶性CD8+T細胞二次擴增的有效機制。

目標：

小鼠靜脈注射單核細胞增多癥。取脾臟和肝臟在Omni Prep多樣本勻漿器上進行勻漿.均質被鍍以進行菌落計數。

A Self-Help Program for Memory CD8+ T Cells: Positive Feedback via CD40-CD40L Signaling as a Critical Determinant of Secondary Expansion

Authors: JA Shugart, S Bambina, AF Alice, R Montler, KS Bahjat

Animal

Application Info

Description:

The ability of memory CD8+ T cells to rapidly proliferate and acquire cytolytic activity is critical for protective immunity against intracellular pathogens. The signals that control this recall response remain unclear. We show that CD40L production by memory CD8+ T cells themselves is an essential catalyst for secondary expansion when systemic inflammation is limited. Secondary immunization accompanied by high levels of systemic inflammation results in CD8+ T cell secondary expansion independent of CD4+ T cells and CD40-CD40L signaling. Conversely, when the inflammatory response is limited, memory CD8+ T cell secondary expansion requires CD40L-producing cells, and memory CD8+ T cells can provide this signal. These results demonstrate that vaccination regimens differ in their dependence on CD40L-expressing CD8+ T cells for secondary expansion, and propose that CD40L-expression by CD8+ T cells is a fail-safe mechanism that can promote memory CD8+ T cell secondary expansion when inflammation is limited.

Goal:

Mice were challenged with L. monocytogenes intravenously. Spleens and livers were harvested and homogenized on an Omni Prep multi-sample homogenizer. Homogenates were plated for colony enumeration.