Cited by 14Hemoglobinopathies and Related DisordersPorphyrin Metabolism and DisordersHemoglobin structure and function

Impaired erythroid-specific gene expression in cAMP-dependent protein kinase-deficient murine erythroleukemia cells.

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Pilz, R.B.·1993·Journal of Biological Chemistry

Abstract

Murine erythroleukemia cells rendered deficient in cAMP-dependent protein kinase (A-kinase) activity by gene transfection are severely impaired in hexamethylene bisacetamide (HMBA)-induced differentiation (Pilz, R. B., Eigenthaler, M., and Boss, G. R. (1992) J. Biol. Chem. 267, 16161-16167). We now demonstrate that the A-kinase-deficient cells produce hemoglobin normally in response to exogenous hemin and that the heme precursor delta-aminolevulinate (delta-ALA) significantly increases HMBA-induced synthesis of heme and globin chains in these cells; these data suggest that impaired heme synthesis is at least partially responsible for the cells' deficient hemoglobin synthesis. HMBA-induced expression of the erythroid-specific delta-ALA synthetase, porphobilinogen deaminase, and beta-globin mRNAs was less in A-kinase-deficient cells than in parental cells and was reduced in proportion to the cells' residual A-kinase activity; relative transcription rates of these genes were reduced concordantly. Impaired expression of these three erythroid-specific genes was a feature of many independently-derived A-kinase-deficient clones, and normal expression was found in transfectants with normal A-kinase activity. The A-kinase-deficient cells did not exhibit a generalized defect in gene regulation since mRNA expression and transcription rates of H- and L-ferritin, c-myc, c-myb, and several housekeeping enzymes were similar in HMBA-treated parental and A-kinase-deficient cells. Our data suggest that A-kinase may be involved in regulating genes with erythroid-specific promoters and provide further evidence for heme as a regulator of globin chain synthesis.

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Crossref · 10.1016/s0021-9258(20)80722-4

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Authors
Pilz, R. B.
Affiliations
University of California San Diego (US)
Corresponding author
Pilz, R.B.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1993-09
Volume
268
Issue
27
Pages
20252-20258
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1547889327
Cited by
14
References
56
Citations by year
2014: 1
FWCI
0.87
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5k08ca001548-04)
  • National Cancer Institute (K08 CA01548)
Topics
  • Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
  • 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
Keywords
protein kinase A, erythroid differentiation, murine erythroleukemia cells, hemoglobin synthesis, heme biosynthesis, delta-aminolevulinic acid synthase, porphobilinogen deaminase, beta-globin gene expression, transcriptional regulation, hemin, hexamethylene bisacetamide
MeSH terms
Acetamides, Aminolevulinic Acid, 5-Aminolevulinate Synthetase, Animals, Cell Differentiation, Cell Nucleus, Leukemia, Erythroblastic, Acute, Ferritins, Globins, Hematinics, Heme, Hemin, Hemoglobins, Leukemia, Experimental, Oncogenes, Hydroxymethylbilane Synthase, Protein Kinases, RNA, Messenger, Transcription, Genetic, Transfection, Tumor Cells, Cultured, Blotting, Northern, Gene Expression, Genes, myc, Mice

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