Cited by 168Drug Transport and Resistance MechanismsPorphyrin Metabolism and DisordersIron Metabolism and Disorders

Increased expression of the Abcg2 transporter during erythroid maturation plays a role in decreasing cellular protoporphyrin IX levels

Open access
Zhou, Sheng, Zong, Yang, Ney, Paul A., Nair, Geeta, Stewart, Clinton F., Sorrentino, Brian P.·2005·Blood

Abstract

ABCG2/BCRP is a member of the adenosine triphosphate–binding cassette (ABC) transporter family and is expressed in intestine, kidney, and liver, where it modulates the absorption and excretion of xenobiotic compounds. ABCG2 is also expressed in hematopoietic stem cells and erythroid cells; however, little is known regarding its role in hematopoiesis. Abcg2 null mice have increased levels of protoporphyrin IX (PPIX) in erythroid cells, yet the mechanism for this remains uncertain. We have found that Abcg2 mRNA expression was up-regulated in differentiating erythroid cells, coinciding with increased expression of other erythroid-specific genes. This expression pattern was associated with significant amounts of ABCG2 protein on the membrane of mature peripheral blood erythrocytes. Erythroid cells engineered to express ABCG2 had significantly lower intracellular levels of PPIX, suggesting the modulation of PPIX level by ABCG2. This modulating activity was abrogated by treatment with a specific ABCG2 inhibitor, Ko143, implying that PPIX may be a direct substrate for the transporter. Taken together, our results demonstrate that ABCG2 plays a role in regulating PPIX levels during erythroid differentiation and suggest a potential role for ABCG2 as a genetic determinant in erythropoietic protoporphyria.

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Crossref · 10.1182/blood-2004-04-1566

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Authors
Zhou, S., Zong, Y., Ney, P. A., Nair, G., Stewart, C. F., & Sorrentino, B. P.
Affiliations
St. Jude Children's Research Hospital (US)
Venue
Blood
Published
2005-03-15
Volume
105
Issue
6
Pages
2571-2576
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W1977748061
Cited by
157
References
31
Citations by year
2026: 9 · 2025: 12 · 2024: 6 · 2023: 6 · 2022: 11 · 2021: 7 · 2020: 6 · 2019: 6 · 2018: 7 · 2017: 6 · 2016: 3 · 2015: 6 · 2014: 10 · 2013: 7 · 2012: 10
FWCI
3.53
Type
journal article
Language
en
Open access
Locations
  • Blood (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01HL067366, R01-HL67366)
  • National Cancer Institute (R01CA084214)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
Keywords
ABCG2, ABC transporters, erythroid maturation, protoporphyrin IX, erythropoiesis, Ko143, erythropoietic protoporphyria, erythrocyte membrane, hematopoiesis, gene expression regulation
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 2, Animals, Biological Transport, Cell Differentiation, Enzyme Inhibitors, Erythrocyte Membrane, Erythropoiesis, Humans, Intestinal Mucosa, Kidney, Liver, Organ Specificity, Protoporphyrins, Mice, Knockout, ATP-Binding Cassette Transporters, K562 Cells, Protoporphyria, Erythropoietic, Mice

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