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Title: Hemozoin produced by mammals confers heme tolerance

Journal Article · · eLife

Free heme is cytotoxic as exemplified by hemolytic diseases and genetic deficiencies in heme recycling and detoxifying pathways. Thus, intracellular accumulation of heme has not been observed in mammalian cells to date. Here we show that mice deficient for the heme transporter SLC48A1 (also known as HRG1) accumulate over ten-fold excess heme in reticuloendothelial macrophage lysosomes that are 10 to 100 times larger than normal. Macrophages tolerate these high concentrations of heme by crystallizing them into hemozoin, which heretofore has only been found in blood-feeding organisms. SLC48A1 deficiency results in impaired erythroid maturation and an inability to systemically respond to iron deficiency. Complete heme tolerance requires a fully-operational heme degradation pathway as haplo insufficiency of HMOX1 combined with SLC48A1 inactivation causes perinatal lethality demonstrating synthetic lethal interactions between heme transport and degradation. Our studies establish the formation of hemozoin by mammals as a previously unsuspected heme tolerance pathway.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Diabetes and Digestive and Kidney Diseases; National Inst. of Environmental Health Sciences; National Human Genome Research Inst.; Japan Synchrotron Radiation Research Inst.
Grant/Contract Number:
AC02-06CH11357; DK085035; ES025661; DK110858; 2017A0074; T32 GM080201
OSTI ID:
1567862
Alternate ID(s):
OSTI ID: 1567864; OSTI ID: 1600787
Journal Information:
eLife, Vol. 8, Issue 2019; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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