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Updated: Jul 18, 2026

Standardization of a Novel Semi-Automatic Software for Neurite Outgrowth Measurement
Published on: August 9, 2024
Mst3b, a purine-sensitive Ste20-like protein kinase, regulates axon outgrowth
1Department of Neurosurgery, Children's Hospital, Boston, MA 02115, USA. nina.irwin@childrens.harvard.edu
Abstract:
The growth of axons is fundamental to the development and repair of brain circuitry. We show here that Mst3b, a neuron-specific homolog of the yeast kinase Ste20, is critical for axon outgrowth. Mst3b is activated in response to trophic factors, and suppressing its expression (via siRNAs) or its function (by a dominant-negative mutant) blocks axon outgrowth. Inosine, a purine nucleoside that stimulates axon outgrowth, activates Mst3b kinase activity, whereas 6-thioguanine, a purine analog that blocks outgrowth, inhibits the activity of this kinase. These findings place Mst3b as a key regulator of axon outgrowth and help explain the purine sensitivity of this process.
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