Processing of cathepsins L, B and D in psoriatic epidermis.
Arch Dermatol Res
; 289(2): 87-93, 1997 Jan.
Article
em En
| MEDLINE
| ID: mdl-9049042
ABSTRACT
Proteinase activity is increased in psoriatic epidermis. To elucidate the involvement of enzymes in psoriatic epidermis, the expression of cathepsins, L, B and D was investigated by Western blotting and immunohistological studies. Normal epidermis contained abundant inactive precursors (39 kDa) of cathepsins L and B and an inactive intermediate form (45 kDa) of cathepsin D. Cathepsin L in psoriasis was processed to a variable extent from the precursor to a single-chain form (30 kDa) and a mixture of single- and heavy-chain (25 kDa) forms of the active mature enzyme, corresponding to the immunohistological staining patterns 'diffuse dense', 'small granular', and unevenly distributed 'condensed granular'. Cathepsin B showed a mixture of precursor form (39 kDa) and single-chain (30 kDa) forms and was expressed as a 'diffuse dense' staining pattern in the mid-spinous layer and as a 'condensed' pattern in the upper spinous and granular layers. Cathepsin D was processed to the heavy-chain (31 kDa) form of activated mature enzyme with small granular staining and a mixture of heavy-chain and degraded protein (28 kDa) with larger and more condensed granular staining. The distribution patterns of 'small granular' cathepsin L, and of cathepsins B and D expression in suprabasal keratinocytes were very similar to that of involucrin. After complete clinical resolution of psoriasis by 8-methoxypsoralen plus UVA treatment, the expression of the three cathepsins was normalized. These results suggest that cathepsins L, B and D in forms activated to a variable extent may be involved in the pathology of psoriasis.
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Base de dados:
MEDLINE
Assunto principal:
Endopeptidases
/
Psoríase
/
Cisteína Endopeptidases
/
Catepsina B
/
Catepsinas
/
Catepsina D
/
Precursores Enzimáticos
Tipo de estudo:
Observational_studies
Idioma:
En
Revista:
Arch Dermatol Res
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Japão