# The Central Role of Macrophages in Long COVID Pathophysiology

## TL;DR

This paper suggests that Long COVID is caused by ongoing immune issues, especially chronic macrophage activation, offering a new way to understand and treat the condition.

## Contribution

The paper introduces a novel hypothesis that chronic macrophage activation is central to Long COVID pathophysiology.

## Key findings

- Long COVID involves sustained innate immune response in monocyte-derived macrophages.
- Macrophages become epigenetically trained into a prolonged inflammatory state.
- Persistent spike protein and gut-related viral reservoirs drive macrophage activation.

## Abstract

This review article attempts to provide a unifying hypothesis to explain the myriad of symptoms and predispositions underlying the development of PASC (Postacute Sequelae of COVID), often referred to as Long COVID. The hypothesis described here proposes that Long COVID is best understood as a disorder of persistent immune dysregulation, with chronic macrophage activation representing the fundamental underlying pathophysiology. Unlike transient post-viral syndromes, Long COVID involves a sustained innate immune response, particularly within monocyte-derived macrophages, driven by persistent spike protein (peripherally in MAIT cells and centrally in Microglial cells), epigenetic imprinting, and gut-related viral reservoirs. These macrophages are not merely activated temporarily but also become epigenetically “trained” into a prolonged inflammatory state, as demonstrated by enduring histone acetylation markers such as H3K27acDNA Reprogramming. It is proposed that recognizing macrophage activation as the central axis of Long COVID pathology offers a framework for personalized risk assessment, targeted intervention, and therapeutic recalibration.