Modulation of myogenic determination factor 1 expression by cell-cell contact

✍ Scribed by An Song; Raymond Daub; Maureen A. Harrington

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 819 KB
• Volume: 156
• Category: Article
• ISSN: 0021-9541
• DOI: 10.1002/jcp.1041560206

✦ Synopsis

Myogenic determination factor 1 (MyoDI) expression is modulated by a variety of agents including growth factors and activated cellular proto-oncogenes. However, little is known about the effect of cell-cell contact, which increases as myoblasts terminally differentiate, on the control of MyoD? expression. Steadystate levels of MyoDl transcripts decline over a 6 1 2 hour time period when myoblasts plated at a single cell density are incubated in media supplemented with 0.2% serum; by 48 hours MyoDl mRNA levels have returned to the initial basal level. The decline in MyoDl transcripts is diminished, but not prevented in myoblasts which maintain cell-cell contacts (at least 50% of cells with two or more sites of contact). MyoDl transcript levels do not change if single cell cultures are maintained in 10% serum or are cocultured with fibroblasts. Analysis of conditioned media revealed that myoblasts plated at the single cell density or at a density which allowed multiple sites of cell-cell contact are not producing an activity($ responsible for modulating MyoD I mRNA levels. The changes in MyoDl expression are mediated at the transcriptional level. Thus changes in the degree of cell-cell contact in cultures of myogenically determined cell lines effect changes in MyoDl gene expression. Consequently when the influence of cytokines or other pharmacological agents on commitment to terminal myogenic differentiation is examined, the degree of cell-cell contact within the culture system may affect the response elicited.