Effect of anti-nerve growth factor treatment on pituitary adenylate cyclase activating polypeptide expression in adult sensory neurons exposed to adjuvant induced inflammation

Neuroscience. 2003;120(2):325-31. doi: 10.1016/s0306-4522(03)00118-0.

Abstract

Expression of pituitary adenylate cyclase activating polypeptide (PACAP) is increased in sensory neurons exposed to adjuvant induced peripheral inflammation. Local elevation in expression of the neurotrophin nerve growth factor (NGF) is a main factor contributing to the neuronal response to inflammation. This study examines the role of endogenous NGF in inflammation-associated increases in PACAP expression using the adjuvant-induced peripheral inflammation model with or without systemic administration of antibodies against NGF. Quantitative in situ hybridization was used to detect changes in neuronal PACAP mRNA expression and to correlate this expression with neuronal mRNA expression of the NGF receptor tyrosine kinase (trk) A. The results from this study show that inflammation triggered increases in PACAP expression occurs in small- to medium-sized dorsal root ganglion (DRG) neurons that also express trkA, and that this elevation in PACAP expression is prevented by systemic injection of anti-NGF. This supports a role for NGF as a positive regulator of PACAP expression during inflammation.

Publication types

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

MeSH terms

  • Animals
  • Antibodies / pharmacology*
  • Carrier Proteins / genetics
  • Carrier Proteins / metabolism
  • Cell Count
  • Dose-Response Relationship, Drug
  • Freund's Adjuvant / adverse effects*
  • Ganglia, Spinal / drug effects
  • Ganglia, Spinal / metabolism
  • Gene Expression Regulation / drug effects
  • Gene Expression Regulation / immunology
  • In Situ Hybridization
  • Male
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism
  • Nerve Growth Factor / immunology*
  • Neurogenic Inflammation / chemically induced
  • Neurogenic Inflammation / immunology
  • Neurogenic Inflammation / metabolism
  • Neurons, Afferent / drug effects*
  • Neurons, Afferent / metabolism
  • Neuropeptides / genetics
  • Neuropeptides / metabolism*
  • Pituitary Adenylate Cyclase-Activating Polypeptide
  • RNA, Messenger / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Receptor, trkA*

Substances

  • Adcyap1 protein, rat
  • Antibodies
  • Carrier Proteins
  • Membrane Proteins
  • Neuropeptides
  • Pituitary Adenylate Cyclase-Activating Polypeptide
  • RNA, Messenger
  • Freund's Adjuvant
  • Nerve Growth Factor
  • Receptor, trkA