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Generation of Monocyte-Derived Dendritic Cells with Differing Sialylated Phenotypes

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Heparan Sulfate Proteoglycans in Immunity.

Moe Iwai^1,2, Pyong Woo Park^1,2

¹Department of Medicine, Boston Children's Hospital, Boston, Massachusetts, USA.

Proteoglycan Research

|July 1, 2026

Summary

Heparan sulfate proteoglycans (HSPGs) are crucial for immune cell function, modulating immune responses and development. Dysregulation of HSPGs contributes to various immune-related diseases, highlighting their importance in health and pathology.

Keywords:

adaptive immunity glypicans heparan sulfate infectious disease inflammatory disease innate immunity proteoglycan serglycin syndecans

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Published on: February 25, 2021

Area of Science:

Immunology
Biochemistry
Cell Biology

Background:

Heparin and heparan sulfate were first identified in immune cells decades ago.
Heparan sulfate proteoglycans (HSPGs) are formed by conjugating heparan sulfate and heparin to core proteins.
HSPGs are widely expressed on leukocytes and interact with numerous immune mediators.

Purpose of the Study:

To review the critical roles of HSPGs in modulating immune cell development and function.
To highlight the mechanisms by which HSPGs regulate major immune cell types.
To underscore the contribution of HSPG dysregulation to various pathologies.

Main Methods:

Literature review of decades of research on HSPGs and immune function.
Analysis of HSPG expression patterns on different leukocyte types.
Examination of HSPG interactions with immune mediators like cytokines and proteases.

Main Results:

HSPGs are expressed by virtually all leukocytes and bind hundreds of immune mediators.
HSPGs modulate immune cell development and responses to threats.
HSPGs play critical roles in facilitating, competing, protecting, presenting, or regulating immune factors.

Conclusions:

HSPGs are essential regulators of immune cell development and function.
Mutations or dysregulation of HSPGs contribute to immunodeficiencies, autoimmune diseases, allergies, and cancer.
Understanding HSPG mechanisms is key to addressing immune-related pathologies.