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Updated: Jun 26, 2025

Immunometabolic Circuits in Infection for Advancing Host Directed Therapies
Published on: September 13, 2024
Intracellular complement and immunometabolism: The advantages of compartmentalization
1Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Sweden.
None:
The complement system is a proteolytic cascade triggered by pathogen and danger-associated molecular patterns, with resultant outcomes of inflammation, cellular activation, and opsonization of material for removal by phagocytosis. While first discovered as an activity in serum, it is now recognized that complement components play important roles at local and individual cell-intrinsic levels. In particular, apart from the extracellular serum activities of complement, it is now believed that complement also acts intracellularly, as part of a cellular signal transduction cascade that can stimulate cellular survival and activation, and individual immune cell phenotypes, via effects on cellular metabolism. This review will describe what is currently known about how complement functions in intracellular signal transduction, and outline the functional advantages of a compartmentalized and intracellular complement system.
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