Related Experiment Video

Updated: Feb 5, 2026

In Vivo Dynamics of Retinal Microglial Activation During Neurodegeneration: Confocal Ophthalmoscopic Imaging and Cell Morphometry in Mouse Glaucoma
12:48

In Vivo Dynamics of Retinal Microglial Activation During Neurodegeneration: Confocal Ophthalmoscopic Imaging and Cell Morphometry in Mouse Glaucoma

Published on: May 11, 2015

11.1K

MerTK-triggered TGFβ1 autocrine signal regulates microglial response to neurodegeneration

Yingying Huang1, Zhangyuzi Deng1, Zhijie Zhou1

  • 1School of Life Sciences, Peking University, Beijing, China.

Nature Communications
|February 3, 2026
PubMed

Insights

Microglial response to neurodegeneration relies on the MerTK receptor, which activates transcription factors PU.1 and IRF8. This pathway induces TGFβ1 in a self-amplifying loop, crucial for microglial function during disease.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglial phagocytosis is vital in neurodegeneration.
  • The self-regulatory mechanisms of microglia during phagocytosis are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms regulating microglial response during neurodegeneration.
  • To investigate the role of the MerTK receptor and downstream signaling pathways.

Main Methods:

  • Utilized a mouse model of pathological axonal degeneration.
  • Employed MerTK-triggered phospholipase C signaling analysis.
  • Performed chromatin immunoprecipitation-sequencing (ChIP-seq) to identify transcription factor targets.
  • Generated microglia-specific knockout models for TGFβ1 and its receptors.

Main Results:

  • Microglial response to axonal degeneration depends on the MerTK receptor.
  • MerTK signaling up-regulates transcription factors PU.1 and IRF8.
  • PU.1 and IRF8 directly target and induce TGFβ1.
  • Neurodegeneration-induced TGFβ1 acts via autocrine signaling, essential for microglial response.
  • This mechanism is conserved in Alzheimer's disease models and human patients.

Conclusions:

  • A novel autocrine signaling pathway involving MerTK, PU.1, IRF8, and TGFβ1 regulates microglial response in neurodegeneration.
  • This pathway is critical for microglial function and is relevant to Alzheimer's disease.

More Related Videos

Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS07:33

Visualization of Vascular Ca2+ Signaling Triggered by Paracrine Derived ROS

Published on: December 21, 2011

16.0K
An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation11:20

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

7.9K

Related Concept Videos

Autocrine Signaling01:01

Autocrine Signaling

Autocrine signaling is one of the many signaling mechanisms that function inside multicellular organisms to carry out intercellular communication. In this type of signaling mechanism, the same cell that secretes an extracellular signaling molecule also expresses the receptors to bind and respond to that signaling molecule.
Autocrine Signaling in Macrophages
Under normal physiological conditions, autocrine signaling is essential for maintaining homeostasis. This process is well characterized in...
52.2K
What is Cell Signaling?02:03

What is Cell Signaling?

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
130.9K
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
3.0K
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
8.0K
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
7.8K
Regulated Protein Degradation02:58

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
8.9K