Negative regulation of selected bHLH proteins by eHAND

Mangkey A. Bounpheng, Tammy A. Morrish, Sherry G. Dodds, Barbara A. Christy

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The bHLH protein eHAND plays an important role in the development of extraembryonic, mesodermal, and cardiac cell lineages, presumably through heterodimerization with other HLH proteins and DNA binding. In this study, we have identified a novel transcriptional activity of eHAND. In transient transfection assays, eHAND is a potent inhibitor of activation by some but not all bHLH proteins, eHAND can prevent E-box DNA binding by these bHLH proteins. Interestingly, eHAND can also strongly inhibit transactivation activity by a MyoD~E47 tethered dimer, which suggests a distinct mechanism of action. eHAND also inhibits MyoD-dependent skeletal muscle cell differentiation and expression of the muscle-specific myosin heavy chain protein. In addition, we show that eHAND can repress activity of the natural p75LNGFR promoter, whose expression overlaps that of eHAND and dHAND. The inhibitory activity of eHAND may be attributed to multiple mechanisms, such as the ability to act as a corepressor, the presence of a repression domain, and its ability to sequester E proteins in an inactive complex. Based upon its inhibitory effect on bHLH proteins and cellular differentiation, we propose that eHAND may function by several mechanisms to promote placental giant cell proliferation by negatively regulating the activities of the bHLH protein MASH-2. (C) 2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)320-331
Number of pages12
JournalExperimental Cell Research
Volume257
Issue number2
DOIs
StatePublished - Jun 15 2000

Fingerprint

Basic Helix-Loop-Helix Transcription Factors
DNA-Binding Proteins
Co-Repressor Proteins
Myosin Heavy Chains
Cell Lineage
Giant Cells
Muscle Cells
Transcriptional Activation
Transfection
Cell Differentiation
Skeletal Muscle
Proteins
Cell Proliferation
Muscles

Keywords

  • bHLH proteins
  • Differentiation
  • eHAND
  • Transcriptional repression

ASJC Scopus subject areas

  • Cell Biology

Cite this

Bounpheng, M. A., Morrish, T. A., Dodds, S. G., & Christy, B. A. (2000). Negative regulation of selected bHLH proteins by eHAND. Experimental Cell Research, 257(2), 320-331. https://doi.org/10.1006/excr.2000.4898

Negative regulation of selected bHLH proteins by eHAND. / Bounpheng, Mangkey A.; Morrish, Tammy A.; Dodds, Sherry G.; Christy, Barbara A.

In: Experimental Cell Research, Vol. 257, No. 2, 15.06.2000, p. 320-331.

Research output: Contribution to journalArticle

Bounpheng, MA, Morrish, TA, Dodds, SG & Christy, BA 2000, 'Negative regulation of selected bHLH proteins by eHAND', Experimental Cell Research, vol. 257, no. 2, pp. 320-331. https://doi.org/10.1006/excr.2000.4898
Bounpheng MA, Morrish TA, Dodds SG, Christy BA. Negative regulation of selected bHLH proteins by eHAND. Experimental Cell Research. 2000 Jun 15;257(2):320-331. https://doi.org/10.1006/excr.2000.4898
Bounpheng, Mangkey A. ; Morrish, Tammy A. ; Dodds, Sherry G. ; Christy, Barbara A. / Negative regulation of selected bHLH proteins by eHAND. In: Experimental Cell Research. 2000 ; Vol. 257, No. 2. pp. 320-331.
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