Spreading of Alzheimer's disease inflammatory signaling through soluble micro-RNA

Neuroreport. 2012 Jul 11;23(10):621-6. doi: 10.1097/WNR.0b013e32835542b0.

Abstract

Alzheimer's disease is a progressive, neurodegenerative disorder that develops within the limbic system, spreading radially into anatomically linked brain association areas as the disease progresses. Analysis of temporal-lobe association of neocortex-derived extracellular fluid and cerebrospinal fluid from Alzheimer's disease patients shows an abundant presence of micro-RNA (miRNA), including the proinflammatory miRNA-146a and miRNA-155. Using a novel and highly sensitive LED-Northern dot-blot focusing technique, we detected the secretion of potentially pathogenic amounts of miRNA-146a and miRNA-155 from stressed human primary neural cells. A conditioned medium containing miRNA-146a and miRNA-155 was found to induce Alzheimer-type gene expression changes in control brain cells. These included downregulation in the expression of an important repressor of the innate immune response, complement factor H (CFH). These effects were neutralized using anti-miRNA strategies. Anti-miRNA-based therapeutics may provide a novel and efficacious treatment to stem the miRNA-mediated spreading of inflammatory signaling involved in Alzheimer's disease.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alzheimer Disease / genetics
  • Alzheimer Disease / pathology*
  • Brain / drug effects
  • Brain / pathology*
  • Coculture Techniques
  • Culture Media, Conditioned / pharmacology
  • Humans
  • Inflammation Mediators / physiology*
  • MicroRNAs / physiology*
  • Signal Transduction / drug effects
  • Signal Transduction / genetics*
  • Solubility

Substances

  • Culture Media, Conditioned
  • Inflammation Mediators
  • MIRN146 microRNA, human
  • MIRN155 microRNA, human
  • MicroRNAs