# The molecular mechanism and therapeutics in axon regeneration

> **NIH NIH R01** · EMORY UNIVERSITY · 2021 · $341,250

## Abstract

Summary
Injuries to peripheral nerves are common, but recovery from them is very poor. There is currently no non-
surgical treatment available. Brain-derived neurotrophic factor (BDNF), and other growth factors, are known
to promote axon regeneration following peripheral nerve injury. The objectives of this proposal are to: 1)
investigate whether the molecular mechanism by which this effect is achieved is through stabilization of the
axonal microtubule-associated protein, Tau in the regenerating axons; and 2) to examine the therapeutic
efficacy of two targeted pharmacological agents designed to mimic these cellular effects. Asparagine
endopeptidase (AEP), a cysteine protease, is robustly activated in cut peripheral nerves and mediates
cleavage of Tau that degrades its stabilizing effect on the axonal cytoskeleton. Because such stabilization is
an essential feature of successful axon regeneration after peripheral nerve injury, inhibiting AEP could be
an important effect of growth factor signaling after peripheral nerve injury. We hypothesize that Akt,
activated by growth factors such as BDNF (or the small molecule BDNF mimetic, 7,8 DHF), phosphorylates
AEP and suppresses its enzymatic activity, thereby preventing degradation of Tau, leading to enhanced
axon regeneration. We will combine in vitro and in vivo experiments to evaluate critical aspects of this
hypothesis in the first two Specific Aims. We have developed a prodrug that elevates oral bioavailability of
7,8-DHF. We also have identified a small allosteric inhibitor of AEP, which blocks Tau cleavage in mice. We
will explore the therapeutic efficacy of treatments with the prodrug or/and the AEP inhibitor in promoting
axon regeneration and functional recovery in Specific Aim 3. Successful completion of the proposed studies
will lead to better understanding of the molecular mechanisms of growth factor-mediated axon regeneration
and identification of a novel drug target for treatment of peripheral nerve injury.

## Key facts

- **NIH application ID:** 10208978
- **Project number:** 5R01NS105982-04
- **Recipient organization:** EMORY UNIVERSITY
- **Principal Investigator:** Arthur W. English
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2021
- **Award amount:** $341,250
- **Award type:** 5
- **Project period:** 2018-09-30 → 2023-06-30

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10208978

## Citation

> US National Institutes of Health, RePORTER application 10208978, The molecular mechanism and therapeutics in axon regeneration (5R01NS105982-04). Retrieved via AI Analytics 2026-05-27 from https://api.ai-analytics.org/grant/nih/10208978. Licensed CC0.

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