Unconventional Neurotrophic Factors CDNF and MANF: Structure, Physiological Functions and Therapeutic Potential

Neurobiol Dis. 2017 Jan;97(Pt B):90-102. doi: 10.1016/j.nbd.2016.07.009. Epub 2016 Jul 15.

Abstract

Cerebral dopamine neurotrophic factor (CDNF) and mesencephalic astrocyte-derived neurotrophic factor (MANF) promote the survival of midbrain dopaminergic neurons which degenerate in Parkinson's disease (PD). However, CDNF and MANF are structurally and functionally clearly distinct from the classical, target-derived neurotrophic factors (NTFs) that are solely secreted proteins. In cells, CDNF and MANF localize in the endoplasmic reticulum (ER) and evidence suggests that MANF, and possibly CDNF, is important for the maintenance of ER homeostasis. MANF expression is particularly high in secretory tissues with extensive protein production and thus a high ER protein folding load. Deletion of MANF in mice results in a diabetic phenotype and the activation of unfolded protein response (UPR) in the pancreatic islets. However, information about the intracellular and extracellular mechanisms of MANF and CDNF action is still limited. Here we will discuss the structural motifs and physiological functions of CDNF and MANF as well as their therapeutic potential for the treatment of neurodegenerative diseases and diabetes. Currently available knockout models of MANF and CDNF in mice, zebrafish and fruit fly will increase information about the biology of these interesting proteins.

Keywords: CDNF; Diabetes; ER stress; MANF; Parkinson's disease.

Publication types

  • Review
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Diabetes Mellitus / drug therapy
  • Diabetes Mellitus / metabolism
  • Humans
  • Nerve Growth Factors / chemistry
  • Nerve Growth Factors / genetics
  • Nerve Growth Factors / metabolism*
  • Nerve Growth Factors / therapeutic use*
  • Neurodegenerative Diseases / drug therapy
  • Neurodegenerative Diseases / metabolism
  • Neuroprotective Agents / chemistry
  • Neuroprotective Agents / therapeutic use

Substances

  • Nerve Growth Factors
  • Neuroprotective Agents