CD34-positive fibroblasts in Reinke's edema

Area of Science:

• Cell biology
• Histopathology
• Vocal fold research

Background:

• Reinke's edema is a vocal fold condition characterized by subepithelial connective tissue changes.
• The cellular composition of vocal fold stroma in Reinke's edema is not fully understood.
• CD34+ fibroblasts, also known as fibrocytes, have been implicated in various tissue repair and fibrotic processes.

Purpose of the Study:

• To investigate the presence and characteristics of CD34+ fibroblasts in normal human vocal folds.
• To determine the extent and nature of CD34+ fibroblasts in cases of Reinke's edema.
• To assess the immunophenotype of CD34+ fibroblasts in Reinke's edema to understand their potential role.

Main Methods:

• Histological analysis of vocal fold tissues.
• Conventional, immunohistochemical, and ultrastructural staining techniques were employed.
• Comparison of 18 cases of Reinke's edema with 4 normal vocal fold controls.

Main Results:

• Normal vocal folds predominantly feature spindle-shaped CD34+ fibroblasts.
• Reinke's edema shows increased density and altered morphology of CD34+ fibroblasts around edematous spaces.
• Activated CD34+ fibroblasts in Reinke's edema exhibit dendritic features and express vimentin, CD10, and CD99, but not α-SMA.

Conclusions:

• CD34+ fibroblasts are a significant cellular component in the stroma of vocal folds affected by Reinke's edema.
• These fibroblasts undergo activation and morphological changes without differentiating into myofibroblasts.
• The precise function of activated CD34+ fibroblasts in the pathogenesis of Reinke's edema warrants further investigation.