(D) Lysosomal-mitochondrial fractions were isolated from mouse fibroblasts untreated or loaded with cholesterol (50 μM). Top: Distribution of LAMP‐2A after Triton X‐114 extraction and sucrose density gradient centrifugation. Bottom: Ability of intact or disrupted lysosomal-mitochondrial fractions to proteolize [14C]GAPDH. Values are expressed as percentage of the degradation in fractions from untreated cells and are the mean±s.e. of triplicate samples. 