Lysosomal cystine transport in cystinosis variants and their parents.

Abstract:

:Children with nephropathic cystinosis store 50 to 100 times normal amounts of free cystine in many cells and display negligible lysosomal cystine transport in their leucocytes and cultured fibroblasts. A patient with intermediate (adolescent) cystinosis exhibited a similar deficiency of egress out of fibroblast lysosome-rich granular fractions. Another individual with benign (adult) cystinosis accumulated only 2.85 nmol 1/2 cystine/mg leucocyte protein, or 20-50% of the amount stored in nephropathic cystinosis leucocytes. His leucocyte granular fractions also displayed substantial residual cystine-carrying capacity, as determined by measurement of lysosomal cystine counter-transport. We conclude that the variant forms of cystinosis represent a continuum of lysosomal cystine storage, with the varied clinical presentation depending on the amount of residual cystine-carrying capacity, genetic predispositions, and differential tissue susceptibilities.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Gahl WA,Tietze F

doi

10.1203/00006450-198702000-00016

subject

Has Abstract

pub_date

1987-02-01 00:00:00

pages

193-6

issue

2

eissn

0031-3998

issn

1530-0447

journal_volume

21

pub_type

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