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Autoimmune Disorders

Autoimmune Disorders

Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
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A Chronic Autoimmune Dry Eye Rat Model with Increase in Effector Memory T Cells in Eyeball Tissue

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CD47 Deficiency Ameliorates Ocular Autoimmune Inflammation.

Yoko Okunuki¹, Steven J Tabor¹, May Y Lee¹

¹Angiogenesis Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, United States.

Frontiers in Immunology

|June 7, 2021

Summary

Depleting CD47 prevents autoimmune uveitis by stopping the development of critical immune cells. This finding highlights CD47

Keywords:

CD47 antigen antigen-presenting cells autoimmune diseases retina uveitis

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Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model

Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model

Published on: January 12, 2022

Area of Science:

Immunology
Ophthalmology
Cell Biology

Background:

Autoimmune uveitis is a severe eye inflammation targeting retinal and uveal tissues.
The CD47 protein and its ligand SIRPα (Signal Regulatory Protein alpha) are key in immune cell interactions and autoimmune disease development.

Purpose of the Study:

To investigate the role of CD47 in experimental autoimmune uveitis (EAU).
To determine if CD47 depletion can prevent EAU by modulating immune cell responses.

Main Methods:

Utilized CD47-deficient mice (CD47 knockout) as a model for autoimmune uveitis.
Analyzed the impact of CD47 deficiency on dendritic cells (DCs) and autoreactive T cells.
Examined the role of retinal microglia expressing SIRPα.

Main Results:

CD47 depletion effectively prevented EAU in mice.
Absence of CD47 suppressed the development of SIRPα+ dendritic cells, crucial for autoreactive CD4+ T cell induction.
Retinal microglia, despite expressing SIRPα, did not contribute to EAU suppression upon CD47 depletion.

Conclusions:

CD47 is a critical regulator in the development of SIRPα+ dendritic cells, essential for EAU induction.
Targeting CD47 presents a potential therapeutic strategy for autoimmune uveitis.