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Prostaglandin binding does not require direct cell-cell contact during chick myogenesis in vitro
Experimental Cell Research
|February 1, 1987
Summary
Prostaglandin binding to myoblasts initiates myogenic differentiation. This cell surface event precedes cell-cell contact and triggers subsequent myoblast aggregation and fusion into myotubes.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Myogenic differentiation involves cell surface events like prostaglandin binding, cell-cell recognition, and fusion.
- The precise sequence of these events, particularly the initial trigger, remains unclear due to asynchronous differentiation in vitro.
Purpose of the Study:
- To determine the initial cell surface event in myogenic differentiation.
- To establish the sequence of events leading to myoblast fusion.
Main Methods:
- Cultured chick embryo myoblasts in suspension using gyratory rotation in low calcium medium to achieve synchronous differentiation.
- Monitored prostaglandin binding, cell aggregation (autoaggregation), and myoblast fusion over time.
Main Results:
- Synchronized myoblasts exhibited characteristic prostaglandin binding at 34 hours.
- Cell aggregation (autoaggregation) initiated within 30 minutes following prostaglandin binding, without medium change.
- Myoblast fusion into syncytia occurred within 8-10 hours post-aggregation.
Conclusions:
- Prostaglandin binding is an early, critical cell surface event in embryonic myogenesis.
- This binding precedes direct cell-cell contact and appears to induce changes in cell adhesion, leading to aggregation and fusion.