Association of p53 and WAF1 expression with apoptosis in diffuse alveolar damage.
Am J Pathol
; 149(2): 531-8, 1996 Aug.
Article
em En
| MEDLINE
| ID: mdl-8701992
ABSTRACT
Little is known about alterations in cell cycle regulatory proteins such as p53 and WAF1 in diffuse alveolar damage (DAD). We hypothesized that up-regulation of p53 and WAF1 in type II pneumocytes in DAD is associated with underlying DNA damage and apoptosis. Twenty cases of DAD and twenty control specimens of lung adjacent to resected tumors were studied. Immunohistochemical stains with antibodies recognizing p53 and WAF1 were performed, and apoptosis was assessed in sixteen cases by the nick end-labeling method. We identified p53 expression and apoptosis in all cases of DAD but not in any of the control lungs. We detected WAF1 expression in nineteen of twenty cases of DAD and in sixteen of twenty control lungs. In general, the distribution and intensity of WAF1 staining were greater in DAD than in control lungs. Staining for both p53 and WAF1 and labeling of apoptotic cells in DAD were usually focal ( < 10% of cells) and predominantly localized in type II pneumocytes. We conclude that increased p53 and WAF1 expression in DAD reflects normal physiological up-regulation in response to cellular and DNA damage and is associated with apoptosis of type II pneumocytes. p53-dependent apoptosis may contribute to the pathogenesis of this disease.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
2_ODS3
/
6_ODS3_enfermedades_notrasmisibles
Base de dados:
MEDLINE
Assunto principal:
Alvéolos Pulmonares
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Proteína Supressora de Tumor p53
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Apoptose
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Ciclinas
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Doenças Pulmonares Intersticiais
/
Inibidores Enzimáticos
Tipo de estudo:
Risk_factors_studies
Limite:
Adolescent
/
Adult
/
Aged
/
Child
/
Child, preschool
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Am J Pathol
Ano de publicação:
1996
Tipo de documento:
Article