Key result
HRG-beta1 augmented acetylcholine receptor cluster numbers by 2-fold in C2 myotubes compared to 100 pM agrin alone after 4 hours of treatment.
Why the study?
The complementary roles of agrin and neuregulin in synapse formation and their combined effect on acetylcholine receptor clustering were not fully understood.
Effect estimate: 2-fold increase
Neuregulin (HRG-beta1) potentiates agrin-induced acetylcholine receptor clustering in C2 myotubes, demonstrating a synergistic role in synapse formation.
Agrin and neuregulin (HRG-beta1) play complementary roles in synapse formation. While HRG-beta1 induces transcriptional up-regulation of postsynaptic proteins, here we present evidence that it can potentiate agrin-induced acetylcholine receptor (AChR) clustering in C2 myotubes. Agrin induced maximal AChR clustering in 4 h. HRG-beta1 treatment for 4 h produced no increase over basal AChR cluster numbers. When myotubes were treated for 4 h with 100 pM agrin, HRG-beta1 augmented AChR cluster numbers by 2-fold compared to myotubes treated with 100 pM agrin alone. Thus, HRG-beta1 can potentiate agrin-induced AChR clustering.
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Ngo et al. (2004) studied this question. HRG-beta1 (neuregulin) and agrin vs. 100 pM agrin alone was evaluated on Acetylcholine receptor (AChR) cluster numbers (2-fold increase). HRG-beta1 augmented acetylcholine receptor cluster numbers by 2-fold in C2 myotubes compared to 100 pM agrin alone after 4 hours of treatment.
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