Cited by 96Iron Metabolism and DisordersNeurological diseases and metabolismTrace Elements in Health

Analysis of Ferritins in Lymphoblastoid Cell Lines and in the Lens of Subjects With Hereditary Hyperferritinemia-Cataract Syndrome

Levi, Sonia, Girelli, Domenico, Perrone, Federica, Pasti, Marcella, Beaumont, Carole, Corrocher, Roberto, Albertini, Alberto, Arosio, Paolo·1998·Blood

Abstract

Hereditary hyperferritinemia-cataract syndrome (HHCS) is an autosomal and dominant disease caused by heterogeneous mutations in the iron responsive element (IRE) of the 5′ untranslated flanking region of ferritin L-chain mRNA, which reduce the binding to the trans iron regulatory proteins and make L-chain synthesis constitutively upregulated. In the several families identified so far, the serum and tissue L-ferritin levels are fivefold to 20-fold higher than in nonaffected control subjects, iron metabolism is apparently normal, and the only relevant clinical symptom is early onset, bilateral cataract. Some pathogenetic aspects of HHCS remain obscure, with particular reference to the isoferritins produced by HHCS cells, as well as the mechanism of cataract formation. We analyzed lymphoblastoid cell lines obtained from two nonaffected control subjects and from HHCS patients carrying the substitution A40G (Paris-1), G41C (Verona-1), and the deletion of the residues 10-38 (Verona-2) in the IRE structure. Enzyme-linked immunosorbent assays specific for the H- and L-type ferritins showed that L-ferritin levels were up to 20-fold higher in HHCS than in control cells and were not affected by iron supplementation or chelation. Sequential immunoprecipitation experiments of metabolically-labeled cells with specific antibodies indicated that in HHCS cells about half of the L-chain was assembled in L-chain homopolymers, which did not incorporate iron, and the other half was assembled in isoferritins with a high proportion of L-chain. In control cells, all ferritin was assembled in functional heteropolymers with equivalent proportion of H- and L-chains. Cellular and ferritin iron uptake was slightly higher in HHCS than control cells. In addition, we analyzed the lens recovered from cataract surgery of a HHCS patient. We found it to contain about 10-fold more L-ferritin than control lens. The ferritin was fully soluble with a low iron content. It was purified and partially characterized. Our data indicate that: (1) in HHCS cells a large proportion of L-ferritin accumulates as nonfunctional L-chain 24 homopolymers; (2) the concomitant fivefold to 10-fold expansion of ferritin heteropolymers, with a shift to L-chain–rich isoferritins, does not have major effects on cellular iron metabolism; (3) L-chain accumulation occurs also in the lens, where it may induce cataract formation by altering the delicate equilibrium between other water-soluble proteins (ie, crystallins) and/or the antioxidant properties.

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Crossref · 10.1182/blood.v91.11.4180

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Authors
Levi, S., Girelli, D., Perrone, F., Pasti, M., Beaumont, C., Corrocher, R., Albertini, A., & Arosio, P.
Affiliations
University of Verona (IT)
Venue
Blood
Published
1998-06-01
Volume
91
Issue
11
Pages
4180-4187
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W2346812772
Cited by
96
References
35
Citations by year
2023: 1 · 2022: 1 · 2021: 6 · 2020: 4 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 3 · 2014: 3 · 2012: 1
FWCI
4.78
Type
journal article
Language
en
Open access
closed
Locations
  • Blood (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca - Università Vita-Salute San Raffaele (submittedVersion)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
Keywords
hereditary hyperferritinemia-cataract syndrome, iron-responsive element, cataract, iron metabolism, iron regulatory proteins, lymphoblastoid cell lines, iron supplementation, chelation therapy, cataract surgery
MeSH terms
Antioxidants, Cataract, Cell Line, Crystallins, DNA, Enzyme-Linked Immunosorbent Assay, Female, Ferritins, Humans, Iron, Lens, Crystalline, Lymphocytes, Nucleic Acid Conformation, Solubility, Iron Metabolism Disorders

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