Abstract

Trigger finger (TF), a painful condition involving a finger flexor tendon, is a common problem with a prevalence of ~2-3% in the general population. However, the TF prevalence is higher among diabetic patients-ranges from 6.7% to 10%. We have analyzed the expression of the extracellular matrix, inflammation, and epigenetic related genes in diabetic and non-diabetes TF. We hypothesized that Diabetes condition induces alter the expression of epigenetic modification genes in diabetic patients and one of the underlying determinants for more prevalence of TF in diabetic patients. Tissues from the fingers of patients with symptomatic trigger fingers were collected. We had three groups: carpal tunnel syndrome (as a control), trigger finger, and diabetic trigger finger. A quantitative real-time polymerase chain reaction was performed. The gene expression of Extracellular matrix (ECM) components [COL-I, COL-II, COL-X, Aggrecan], DNA methyltransferases enzymes (DNMT1, DNMT3), growth factors (TGF-b, IGF), and Histone deacetylase enzymes (HDAC1, HDAC2) were evaluated in all groups. The mRNA expression of COL-I, COL-II, Aggrecan was significantly higher in the pully A1 of diabetic patients (p= 0.0164, p=0.0351, p=0.0399, respectively) as compared to non-diabetic TF patients. Diabetes was associated with a significant increase in the DNMT3 expression compared to non-diabetic TF patients (p=0.0485). HDAC1 and HDAC2 gene expression were up-regulated in diabetic TF than non-diabetic TF. The chronic state of hyperglycemia induces epigenetic modification of gene expressions in trigger fingers. This seems to have a significant impact on the development, recurrence, and progression of trigger finger in diabetic patients.

Highlights

  • Trigger finger or stenosing tenosynovitis is one of the most common finger aliment which is a result of a size disproportion of the flexor tendons and the surrounding retinacular pulley system at the first annular (A1) pulley

  • The chronic state of hyperglycemia induces epigenetic modification of gene expressions in trigger fingers. This seems to have a significant impact on the development, recurrence, and progression of trigger finger in diabetic patients

  • We have evaluated the gene expression of epigenetic regulation associated with inflammation and structural integrity

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Summary

Introduction

Trigger finger or stenosing tenosynovitis is one of the most common finger aliment which is a result of a size disproportion of the flexor tendons and the surrounding retinacular pulley system at the first annular (A1) pulley. Several studies have pointed towards the pulley as the cause versus the tendon, but the consensus is that the system undergoes inflammatory and hypercellular changes to affect the normal motion. It’s widely considered that it’s caused by inflammation and subsequent fibrotic narrowing of the A1 pulley, which causes pain, clicking, catching, and loss of motion of the affected finger [1,2]. Trigger finger (TF), a painful condition involving a finger flexor tendon, is a common problem with a prevalence of ~2-3% in the general population. We hypothesized that Diabetes condition induces alter the expression of epigenetic modification genes in diabetic patients and one of the underlying determinants for more prevalence of TF in diabetic patients

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