Adducin in erythrocyte precursor cells of rats and humans: expression and compartmentalization.

Published

Journal Article

Adducin is a calmodulin-binding protein involved in the assembly of the erythrocyte membrane skeleton. To investigate the expression of adducin during human erythropoiesis, we performed immunofluorescence studies on smears of cultured human erythroblasts. Adducin immunoreactivity was found in the early stages of erythropoiesis. Proerythroblasts were the first erythroid precursor cells positive for adducin. The adducin signal was very similar to the signal of erythroid beta-spectrin in that both proteins lined the membrane of erythroid precursor cells. Cell fractionation experiments were performed to further analyze the intracellular distribution of adducin in erythroid cells. In erythroblasts, about 60% of total cellular adducin appeared in the Triton-soluble fraction. In reticulocytes, the Triton-soluble fraction decreased to 30% of total reticulocyte adducin. Erythrocytes had no detectable amount of adducin in the Triton-soluble pool. Instead, adducin was quantitatively bound to the Triton-insoluble erythrocyte cytoskeleton. Our results suggest that adducin is expressed early in the development of the erythrocyte membrane skeleton, whereas stable assembly onto the membrane skeleton does not occur before the final stages of mammalian erythropoiesis.

Full Text

Duke Authors

Cited Authors

  • Nehls, V; Drenckhahn, D; Joshi, R; Bennett, V

Published Date

  • October 1991

Published In

Volume / Issue

  • 78 / 7

Start / End Page

  • 1692 - 1696

PubMed ID

  • 1912559

Pubmed Central ID

  • 1912559

Electronic International Standard Serial Number (EISSN)

  • 1528-0020

International Standard Serial Number (ISSN)

  • 0006-4971

Language

  • eng