Amyloid in localized cutaneous amyloidosis: immunofluorescence studies with anti-keratin antiserum especially concerning the difference between systemic and localized cutaneous amyloidosis

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<jats:p>Amyloid of localized cutaneous amyloidosis and systemic amyloidosis were subjected to study with an indirect immunofluorescence technique using anti-keratin antiserum. Anti-keratin antiserum was prepared ad modum Sun & Green. Amyloid of localized cutaneous amyloidosis was positively stained for the antiserum, whereas amyloid of systemic amyloidosis (primary and multiple myeloma-associated) was negative. There was no difference between primary localized cutaneous amyloidosis (lichen amyloidosus and macular amyloidosis) and secondary localized cutaneous amyloidosis (amyloidosis associated with skin tumor). These results indicate that amyloid of localized cutaneous amyloidosis contains components derived from epidermal fibrous protein, probably tonofilaments of keratinocytes.</jats:p>

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