# Microglial Activation in Cerebrovascular Accidents and the Manifestation of Major Depressive Disorder: A Comprehensive Review

## TL;DR

This review explores how immune system changes, especially microglial activation, connect strokes and depression, suggesting new research directions.

## Contribution

The paper highlights MyD88's role in linking microglial activation to both cerebrovascular accidents and depression.

## Key findings

- Microglial activation is a central mechanism linking cerebrovascular accidents and major depressive disorder.
- Proinflammatory processes, including elevated cytokines and immune cell changes, worsen neurological and psychiatric outcomes.
- MyD88 plays a key role in proinflammatory signaling pathways that drive microglial activation.

## Abstract

Emerging evidence highlights a strong association between cerebrovascular accident (CVA) and major depressive disorder (MDD), mediated by immune dysregulation. Elevated levels of proinflammatory cytokines, reduced adaptive immune responses, altered immune cell composition, and increased microglial activation characterize this bidirectional relationship. Microglial activation appears to be a central molecular mechanism linking CVA and MDD, underscoring the immune system’s crucial role in disease pathogenesis. This interplay suggests that immune-driven processes not only exacerbate neurological damage but also contribute to psychiatric manifestations. Based on current literature, the role of proinflammatory processes, particularly microglial activation, in the relationship between CVA and MDD warrants special attention. In this context, the participation of myeloid differentiation factor 88 (MyD88), a cytosolic adaptor protein, appears to play a key role in proinflammatory signaling pathways driving microglial activation. Thus, focusing on MyD88 emerges as a promising complementary strategy for future research and for advancing our understanding of the mechanisms underlying microglial homeostasis dysregulation and its link to the pathophysiology of MDD and CVA.