A novel cysteine-rich neurotrophic factor in Aplysia facilitates growth, MAPK activation, and long-term synaptic facilitation

Lu Pu, Ashley M. Kopec, Heather D. Boyle, Thomas Carew

Research output: Contribution to journalArticle

Abstract

Neurotrophins are critically involved in developmental processes such as neuronal cell survival, growth, and differentiation, as well as in adult synaptic plasticity contributing to learning and memory. Our previous studies examining neurotrophins and memory formation in Aplysia showed that a TrkB ligand is required for MAPK activation, long-term synaptic facilitation (LTF), and long-term memory (LTM) for sensitization. These studies indicate that neurotrophin-like molecules in Aplysia can act as key elements in a functionally conserved TrkB signaling pathway. Here we report that we have cloned and characterized a novel neurotrophic factor, Aplysia cysteine-rich neurotrophic factor (apCRNF), which shares classical structural and functional characteristics with mammalian neurotrophins. We show that apCRNF (1) is highly enriched in the CNS, (2) enhances neurite elongation and branching, (3) interacts with mammalian TrkB and p75NTR, (4) is released from Aplysia CNS in an activity-dependent fashion, (5) facilitates MAPK activation in a tyrosine kinase dependent manner in response to sensitizing stimuli, and (6) facilitates the induction of LTF. These results show that apCRNF is a native neurotrophic factor in Aplysia that can engage the molecular and synaptic mechanisms underlying memory formation.

Original languageEnglish (US)
Pages (from-to)215-222
Number of pages8
JournalLearning and Memory
Volume21
Issue number4
DOIs
StatePublished - 2014

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Aplysia
Nerve Growth Factors
Cysteine
Growth
Neuronal Plasticity
Long-Term Memory
Neurites
Protein-Tyrosine Kinases
Cell Differentiation
Cell Survival
Learning
Ligands

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience
  • Neuropsychology and Physiological Psychology
  • Medicine(all)

Cite this

A novel cysteine-rich neurotrophic factor in Aplysia facilitates growth, MAPK activation, and long-term synaptic facilitation. / Pu, Lu; Kopec, Ashley M.; Boyle, Heather D.; Carew, Thomas.

In: Learning and Memory, Vol. 21, No. 4, 2014, p. 215-222.

Research output: Contribution to journalArticle

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