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Annexin A1 subcellular expression in laryngeal squamous cell carcinoma

V A F Alves1, S Nonogaki, P M Cury

  • 1Department of Pathology, School of Medicine, USP, São Paulo, Brazil.

Histopathology
|December 17, 2008
PubMed
Abstract

Insights

Annexin A1 (ANXA1) expression decreases in laryngeal squamous cell carcinoma (LSCC). This ANXA1 down-regulation occurs early in laryngeal carcinogenesis and involves ANXA1 migration from the nucleus to the membrane.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Annexin A1 (ANXA1) is a protein involved in cytoskeletal organization and cell differentiation, particularly in inflammatory and neoplastic processes.
  • ANXA1 exhibits dynamic subcellular localization, moving between cytoplasm, membranes, nucleus, and extracellular space, influenced by signaling pathways.
  • Its role in laryngeal carcinogenesis is not fully understood.

Purpose of the Study:

  • To investigate the subcellular expression patterns of ANXA1 in neoplastic and non-neoplastic laryngeal tissues.
  • To elucidate the specific role of ANXA1 in the process of laryngeal carcinogenesis.
  • To correlate ANXA1 expression patterns with clinicopathological features of laryngeal squamous cell carcinoma (LSCC).

Main Methods:

  • Gene expression analysis to compare ANXA1 levels in LSCC and normal tissues.
  • Quantitative polymerase chain reaction (qPCR) to confirm ANXA1 gene expression.
  • Immunohistochemical analysis of ANXA1 subcellular localization in 241 LSCC samples from 95 patients.

Main Results:

  • Reduced ANXA1 gene expression was detected in LSCC compared to non-neoplastic margins.
  • ANXA1 expression was found to be down-regulated in dysplastic, tumorous, and metastatic lesions.
  • A progressive shift of ANXA1 localization from the nucleus to the cell membrane was observed during laryngeal tumorigenesis.

Conclusions:

  • ANXA1 dysregulation is an early event in laryngeal carcinogenesis, evident even in intra-epithelial neoplasms.
  • The observed down-regulation and subcellular redistribution of ANXA1 are significant in the early stages of laryngeal cancer development.
  • ANXA1 expression levels were not found to be associated with prognostic parameters like nodal metastasis.

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