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The Bcl-2 protein expression in germinal centers of hypertrophied adenoids in children

M Musiatowicz1, E Hassmann-Poznańska, B Musiatowicz

  • 1Department of Paediatric Otorhinolaryngology, Medical University of Bialystok, Waszyngtona 17, 15-273 Bialystok, Poland. medix@home.pl

International Journal of Pediatric Otorhinolaryngology
|December 4, 2003
PubMed

Insights

Bcl-2 expression in children's adenoids indicates proper lymphocyte maturation, not significantly changing with age or clinical status. Adenoid involution likely relates to follicle number, not altered germinal center processes.

Area of Science:

  • Immunology
  • Pediatric Pathology

Background:

  • Adenoidal tissue plays a role in the pediatric immune system.
  • Bcl-2 protein is a key regulator of apoptosis, crucial for lymphocyte maturation in lymphoid follicles.

Purpose of the Study:

  • To investigate Bcl-2 expression in pediatric adenoid germinal centers.
  • To assess if Bcl-2 expression can serve as a marker for adenoidal tissue function.
  • To analyze the correlation between Bcl-2 expression, age, and clinical status.

Main Methods:

  • Immunohistochemical analysis of adenoid tissue from 95 children using anti-Bcl-2 monoclonal antibodies.
  • Categorization of patients into three age groups (up to 5, 5-10, and over 10 years).
  • Scoring of Bcl-2 positive lymphocytes and immunostaining intensity within lymphoid follicles.

Main Results:

  • Bcl-2 positive lymphocytes were identified primarily in the mantle zone of adenoidal lymphoid follicles.
  • Widespread Bcl-2 reactivity was observed in hyperplastic lymphoid tissue, including germinal centers and T-cell areas.
  • No statistically significant correlation was found between Bcl-2 expression levels, age, or clinical status.

Conclusions:

  • Bcl-2 expression, indicative of apoptosis regulation and lymphocyte maturation, appears consistent across different ages in pediatric adenoids.
  • Adenoid involution is likely associated with a decrease in lymphoid follicle number rather than alterations in the apoptotic processes within them.
  • Bcl-2 expression is a marker of normal lymphocyte maturation processes within adenoidal germinal centers, unaffected by age.

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