Anatomy of a discovery: m1 and m2 macrophages.

Abstract:

:M1 and M2 macrophage-type responses kill or repair in vivo. The unique ability of macrophages to make these polar opposite type of responses provides primary host protection and maintains tissue homeostasis throughout the animal kingdom. In humans and other higher animals, M1 and M2-type macrophage responses also initiate and direct T cells/adaptive immunity to provide additional protection such as Th1 (cytotoxic) or Th2 (antibody-mediated) type responses. Hence, macrophages were renamed M1 and M2 to indicate the central role of macrophages/innate immunity in immune systems. These findings indicate that the long held notion that adaptive immunity controls innate immunity was backward: a sea change in understanding how immune responses occur. The clinical impact of M1/kill and M2/repair responses is immense playing pivotal roles in curing (or causing) many diseases including infections, cancer, autoimmunity, and atherosclerosis. How M1/M2 came to be is an interesting story that, like life, involved Direction, Determination, Discouragement, and Discovery.

journal_name

Front Immunol

journal_title

Frontiers in immunology

authors

Mills CD

doi

10.3389/fimmu.2015.00212

subject

Has Abstract

pub_date

2015-05-05 00:00:00

pages

212

issn

1664-3224

journal_volume

6

pub_type

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