Apoptosis in epithelial hyperplastic laryngeal lesions

Area of Science:

• Oncology
• Cell Biology
• Pathology

Background:

• Epithelial laryngeal hyperplasia (HP) encompasses a spectrum of lesions.
• Fas receptor-mediated apoptosis is a known cellular process.
• The role of apoptosis and related proteins in HP progression is not fully understood.

Purpose of the Study:

• To investigate the expression of Fas receptor, bcl-2, metallothionein (MT), and MIB-1 in different types of laryngeal hyperplasia.
• To assess the degree of apoptosis in laryngeal hyperplasia using TUNEL assay.
• To correlate these markers with the progression of laryngeal lesions.

Main Methods:

• Immunohistochemistry was used to detect Fas receptor, bcl-2, MT, and MIB-1 protein expression.
• TUNEL assay was performed to evaluate apoptotic cell death.
• Laryngeal tissue samples from various HP types, CIS, and invasive carcinomas were analyzed.

Main Results:

• Fas receptor was expressed in all HP types.
• Higher levels of anti-apoptotic bcl-2 protein were observed in simple HP compared to advanced types.
• Metallothionein (MT) was overexpressed in the basal layers of simple HP.
• MIB-1 positivity was detected only in atypical HP, CIS, and invasive carcinomas.
• No significant differences in the degree of apoptosis were found between different epithelial types via TUNEL.

Conclusions:

• The findings suggest that apoptosis may be less critical in early-stage simple HP.
• Metallothionein (MT) might play a role in inhibiting apoptosis in basal cells of simple HP.
• MIB-1 expression correlates with proliferation in more advanced laryngeal lesions, potentially indicating a poorer prognosis.