Cited by 89Porphyrin Metabolism and DisordersHemoglobin structure and functionPeroxisome Proliferator-Activated Receptors

Induction of peripheral-type benzodiazepine receptors during differentiation of mouse erythroleukemia cells. A possible involvement of these receptors in heme biosynthesis.

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Taketani, S., Kohno, H., Okuda, M., Furukawa, T., Tokunaga, R.·1994·Journal of Biological Chemistry

Abstract

To search for a possible role for peripheral-type benzodiazepine receptors (PBR) during erythroid differentiation, we cloned the PBR isoquinoline carboxamide-binding protein (PBR/IBP), an 18-kDa protein on PBR, from a mouse erythroleukemia (MEL) cell cDNA library. Sequence analysis revealed that PBR/IBP comprises 169 amino acid residues (M(r) 18,828), and has a high homology with PBR/IBP from other sources. The cDNA allows for the expression of active PBR/IBP, exhibiting a high affinity for isoquinoline carboxamide, [3H]PK11195, with Kd of 0.80 and 1.56 nM. RNA blot analysis revealed that treatment of MEL cells with dimethyl sulfoxide led to an increase in PBR/IBP mRNA (delta 1.0 kilobases) for up to 72 h, with a concomitant induction of mRNAs for heme biosynthetic enzymes, coproporphyrinogen oxidase and ferrochelatase. The induction of PBR/IBP mRNA was also observed in MEL cells induced with diazepam. The binding activity of [3H]PK11195 in MEL cells showed a high affinity with Kd of 0.69-2.13 nM, and increased during erythroid differentiation. The order of potency of different ligands to compete against [3H]PK11195 binding in induced MEL cells was PK11195 > protoporphyrin IX > diazepam > coproporphyrinogen III > coproporphyrin III > estazolam. In contrast to the induction of PBR/IBP in induced MEL cells, the voltage-dependent anion channel (mitochondrial porin) associated with PBR remained unchanged. These results suggest that PBR/IBP on PBR may be involved in porphyrin transport and may even be a critical factor in erythroid-specific induction of heme biosynthesis.

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Crossref · 10.1016/s0021-9258(17)37318-0

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  • The product coproporphyrinogen III is transported to the intermembrane space of mitochondria probably by peripheral-type benzodiazepine receptors (PBR).

    “The product of this reaction – coproporphyrinogen III is transported to the intermembrane space of mitochondria probably by peripheral-type benzodiazepine receptors (PBR) [18,19].”

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Authors
Taketani, S., Kohno, H., Okuda, M., Furukawa, T., & Tokunaga, R.
Affiliations
Kansai Medical University (JP)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1994-03
Volume
269
Issue
10
Pages
7527-7531
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1526937427
Cited by
88
References
32
Citations by year
2024: 1 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 3 · 2018: 1 · 2017: 2 · 2016: 5 · 2015: 6 · 2014: 3 · 2013: 1 · 2012: 2
FWCI
1.88
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
Keywords
translocator protein (TSPO), erythroid differentiation, mouse erythroleukemia cells, heme biosynthesis, coproporphyrinogen oxidase, ferrochelatase, diazepam, dimethyl sulfoxide, cDNA cloning, ligand specificity
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Binding Sites, Cloning, Molecular, Coproporphyrinogen Oxidase, Leukemia, Erythroblastic, Acute, Ferrochelatase, Hematopoiesis, Heme, Isoquinolines, Molecular Sequence Data, Receptors, GABA-A, RNA, Messenger, Tumor Cells, Cultured, Blotting, Western, DNA, Complementary, Mice

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