The descent of memory T-cell subsets

How are different memory T-cell subsets related? This is a topic of much debate; but in this article, it is suggested that the central memory and effector memory CD8 + T cells that are generated after an acute infection are distinct cell lineages. The immune system has evolved by continuously increasing its complexity to provide the host with an advantage over infectious agents. The development of immunological memory engenders long-lasting protection and lengthens the lifespan of the host. The generation of subsets of memory T cells with distinct homing and functional properties increases our defensive capabilities. However, the developmental relationship of memory T-cell subsets is a matter of debate. In this Opinion article, in light of recent developments, we suggest that it is probable that two distinct lineages comprise the memory CD8 + T-cell population generated in response to infection.