Abstract

Lymphoid cell lines (LCL) were established by Epstein-Barr Virus (EBV) transformation of blood B-lymphocytes from two different patients affected with Niemann-Pick disease (NPD) type B. Those lines were severely deficient in sphingomyelinase activity (8% and 10% residual activity). Ultrastructural investigations showed in both these lines the presence of numerous osmiophilic, dense and pleiomorphic inclusions characteristic of lysosomal storage (due to the accumulation of amphiphilic lipids) similar to those observed in tissues from NPD.

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