Localization of advanced glycation end-products and their receptor in tendinopathic lesions

Area of Science:

• Biomedical Science
• Orthopedics
• Pathology

Background:

• Tendinopathy involves pathological changes in tendon tissue.
• Advanced glycation end-products (AGEs) are implicated in various chronic diseases.
• The role of AGEs and their receptor (RAGE) in tendinopathy is not fully understood.

Purpose of the Study:

• To investigate the accumulation of AGEs and expression of RAGE in human tendinopathic posterior tibial tendons (PTT).
• To compare AGEs and RAGE presence in tendinopathic PTT with healthy flexor digitorum longus (FDL) tendon autografts.

Main Methods:

• Histological and immunohistochemical analysis of tendinopathic PTT and control FDL tissues.
• Western blot analysis to confirm protein expression of AGEs and RAGE.

Main Results:

• Tendinopathic PTT showed disorganized collagen, increased cellularity, and vascularity.
• AGEs were heterogeneously accumulated in tendinopathic PTT, particularly around disorganized collagen and in tenocytes.
• RAGE-positive tenocytes were more numerous in tendinopathic PTT compared to controls.
• Western blot confirmed AGEs and RAGE expression in both groups, without significant density differences.

Conclusions:

• The spatial association of AGEs and RAGE-positive tenocytes in tendinopathic lesions suggests their involvement in the molecular pathology of tendinopathy.
• AGEs accumulation and RAGE expression are features of human tendinopathy.