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Heparanase and autoimmune diabetes
Charmaine J Simeonovic1, Andrew F Ziolkowski1, Zuopeng Wu1
1Diabetes/Transplantation Immunobiology Laboratory, The John Curtin School of Medical Research, The Australian National University , Canberra, ACT , Australia ; Cancer and Vascular Biology Group, Department of Immunology, The John Curtin School of Medical Research, The Australian National University , Canberra, ACT , Australia.
Frontiers in Immunology
|January 15, 2014
Summary
Heparanase (Hpse) facilitates leukocyte infiltration in autoimmune Type 1 diabetes (T1D). Inhibiting Hpse in non-obese diabetic mice significantly reduced T1D incidence, identifying Hpse as a therapeutic target.
Area of Science:
- Biochemistry
- Immunology
- Endocrinology
Background:
- Heparanase (Hpse) degrades heparan sulfate (HS), a key component of heparan sulfate proteoglycans (HSPGs).
- Hpse regulates HS turnover and extracellular matrix (ECM) integrity, influencing cell migration and inflammation.
- In Type 1 diabetes (T1D), Hpse aids leukocyte infiltration into pancreatic islets by degrading basement membranes (BMs) and intracellular HS, crucial for beta-cell survival.
Purpose of the Study:
- To investigate the role of Hpse in the pathogenesis of autoimmune Type 1 diabetes (T1D).
- To evaluate the therapeutic potential of Hpse inhibitors in preventing T1D development and progression.
Main Methods:
- Utilized the non-obese diabetic (NOD) mouse model of T1D.
- Administered the Hpse inhibitor PI-88 to pre-diabetic NOD mice.
- Assessed T1D incidence, islet integrity, and HS levels post-treatment.
Main Results:
- Treatment with PI-88 significantly reduced T1D incidence by approximately 50% in NOD mice.
- Hpse inhibition preserved islet HS, indicating protection of insulin-producing beta cells.
- Demonstrated that T1D progression is dependent on Hpse activity.
Conclusions:
- Heparanase (Hpse) functions as a critical immune effector mechanism in T1D.
- Hpse inhibitors represent a novel therapeutic strategy for preventing T1D and its vascular complications.
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